Imported Upstream version 2.1.3upstream/2.1.3

147 files changed, 7887 insertions, 6469 deletions

diff --git a/src/Makefile.am b/src/Makefile.am
index 19a80d0..ce20225 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -5,82 +5,41 @@ pkgconfig_DATA = libzmq.pc
 
 include_HEADERS = ../include/zmq.h ../include/zmq.hpp ../include/zmq_utils.h
 
-if BUILD_PGM
-pgm_sources = ../foreign/openpgm/@pgm_basename@/openpgm/pgm/packet.c \
-    ../foreign/openpgm/@pgm_basename@/openpgm/pgm/time.c \
-    ../foreign/openpgm/@pgm_basename@/openpgm/pgm/if.c \
-    ../foreign/openpgm/@pgm_basename@/openpgm/pgm/getifaddrs.c \
-    ../foreign/openpgm/@pgm_basename@/openpgm/pgm/getnodeaddr.c \
-    ../foreign/openpgm/@pgm_basename@/openpgm/pgm/indextoaddr.c \
-    ../foreign/openpgm/@pgm_basename@/openpgm/pgm/indextoname.c \
-    ../foreign/openpgm/@pgm_basename@/openpgm/pgm/nametoindex.c \
-    ../foreign/openpgm/@pgm_basename@/openpgm/pgm/inet_network.c \
-    ../foreign/openpgm/@pgm_basename@/openpgm/pgm/md5.c \
-    ../foreign/openpgm/@pgm_basename@/openpgm/pgm/gsi.c \
-    ../foreign/openpgm/@pgm_basename@/openpgm/pgm/tsi.c \
-    ../foreign/openpgm/@pgm_basename@/openpgm/pgm/signal.c \
-    ../foreign/openpgm/@pgm_basename@/openpgm/pgm/txwi.c \
-    ../foreign/openpgm/@pgm_basename@/openpgm/pgm/rxwi.c \
-    ../foreign/openpgm/@pgm_basename@/openpgm/pgm/transport.c \
-    ../foreign/openpgm/@pgm_basename@/openpgm/pgm/source.c \
-    ../foreign/openpgm/@pgm_basename@/openpgm/pgm/receiver.c \
-    ../foreign/openpgm/@pgm_basename@/openpgm/pgm/recv.c \
-    ../foreign/openpgm/@pgm_basename@/openpgm/pgm/pgm.c \
-    ../foreign/openpgm/@pgm_basename@/openpgm/pgm/timer.c \
-    ../foreign/openpgm/@pgm_basename@/openpgm/pgm/net.c \
-    ../foreign/openpgm/@pgm_basename@/openpgm/pgm/rate_control.c \
-    ../foreign/openpgm/@pgm_basename@/openpgm/pgm/async.c \
-    ../foreign/openpgm/@pgm_basename@/openpgm/pgm/checksum.c \
-    ../foreign/openpgm/@pgm_basename@/openpgm/pgm/reed_solomon.c \
-    ../foreign/openpgm/@pgm_basename@/openpgm/pgm/galois_tables.c \
-    ../foreign/openpgm/@pgm_basename@/openpgm/pgm/wsastrerror.c \
-    ../foreign/openpgm/@pgm_basename@/openpgm/pgm/glib-compat.c \
-    ../foreign/openpgm/@pgm_basename@/openpgm/pgm/backtrace.c \
-    ../foreign/openpgm/@pgm_basename@/openpgm/pgm/log.c \
-    ../foreign/openpgm/@pgm_basename@/openpgm/pgm/sockaddr.c \
-    ../foreign/openpgm/@pgm_basename@/openpgm/pgm/version.c
-
-../foreign/openpgm/@pgm_basename@/openpgm/pgm/version.c: ../foreign/openpgm/@pgm_basename@/openpgm/pgm/version_generator.py
-	python ../foreign/openpgm/@pgm_basename@/openpgm/pgm/version_generator.py > $@
-
-../foreign/openpgm/@pgm_basename@/openpgm/pgm/galois_tables.c: ../foreign/openpgm/@pgm_basename@/openpgm/pgm/galois_generator.pl
-	perl ../foreign/openpgm/@pgm_basename@/openpgm/pgm/galois_generator.pl > $@
-endif
-
-nodist_libzmq_la_SOURCES = $(pgm_sources)
-
-libzmq_la_SOURCES = app_thread.hpp \
+libzmq_la_SOURCES = \
+    array.hpp \
     atomic_counter.hpp \
     atomic_ptr.hpp \
     blob.hpp \
+    clock.hpp \
     command.hpp \
     config.hpp \
+    connect_session.hpp \
     ctx.hpp \
     decoder.hpp \
+    device.hpp \
     devpoll.hpp \
-    push.hpp \
+    dist.hpp \
     encoder.hpp \
     epoll.hpp \
     err.hpp \
     fd.hpp \
-    forwarder.hpp \
     fq.hpp \
     i_inout.hpp \
     io_object.hpp \
     io_thread.hpp \
     ip.hpp \
-    i_endpoint.hpp \
     i_engine.hpp \
     i_poll_events.hpp \
     kqueue.hpp \
     lb.hpp \
     likely.hpp \
+    mailbox.hpp \
     msg_content.hpp \
-    msg_store.hpp \
     mutex.hpp \
+    named_session.hpp \
     object.hpp \
     options.hpp \
-    owned.hpp \
+    own.hpp \
     pgm_receiver.hpp \
     pgm_sender.hpp \
     pgm_socket.hpp \
@@ -88,86 +47,93 @@ libzmq_la_SOURCES = app_thread.hpp \
     platform.hpp \
     poll.hpp \
     poller.hpp \
+    poller_base.hpp \
     pair.hpp \
-    prefix_tree.hpp \
     pub.hpp \
-    queue.hpp \
+    pull.hpp \
+    push.hpp \
+    reaper.hpp \
     rep.hpp \
     req.hpp \
     select.hpp \
+    semaphore.hpp \
     session.hpp \
-    signaler.hpp \
     socket_base.hpp \
     stdint.hpp \
-    streamer.hpp \
     sub.hpp \
+    swap.hpp \
     tcp_connecter.hpp \
     tcp_listener.hpp \
     tcp_socket.hpp \
     thread.hpp \
-    pull.hpp \
+    transient_session.hpp \
+    trie.hpp \
     uuid.hpp \
     windows.hpp \
     wire.hpp \
+    xpub.hpp \
     xrep.hpp \
     xreq.hpp \
-    yarray.hpp \
-    yarray_item.hpp \
+    xsub.hpp \
     ypipe.hpp \
     yqueue.hpp \
     zmq_connecter.hpp \
-    zmq_decoder.hpp \
-    zmq_encoder.hpp \
     zmq_engine.hpp \
     zmq_init.hpp \
     zmq_listener.hpp \
-    app_thread.cpp \
+    clock.cpp \
     command.cpp \
     ctx.cpp \
+    connect_session.cpp \
+    decoder.cpp \
+    device.cpp \
     devpoll.cpp \
-    push.cpp \
+    dist.cpp \
+    encoder.cpp \
     epoll.cpp \
     err.cpp \
-    forwarder.cpp \
     fq.cpp \
     io_object.cpp \
     io_thread.cpp \
     ip.cpp \
     kqueue.cpp \
     lb.cpp \
-    msg_store.cpp \
+    mailbox.cpp \
+    named_session.cpp \
     object.cpp \
     options.cpp \
-    owned.cpp \
+    own.cpp \
+    pair.cpp \
     pgm_receiver.cpp \
     pgm_sender.cpp \
     pgm_socket.cpp \
-    pair.cpp \
-    prefix_tree.cpp \
     pipe.cpp \
     poll.cpp \
+    poller_base.cpp \
+    pull.cpp \
+    push.cpp \
+    reaper.cpp \
     pub.cpp \
-    queue.cpp \
     rep.cpp \
     req.cpp \
     select.cpp \
     session.cpp \
-    signaler.cpp \
     socket_base.cpp \
-    streamer.cpp \
     sub.cpp \
+    swap.cpp \
     tcp_connecter.cpp \
     tcp_listener.cpp \
     tcp_socket.cpp \
     thread.cpp \
-    pull.cpp \
+    transient_session.cpp \
+    trie.cpp \
     uuid.cpp \
+    xpub.cpp \
     xrep.cpp \
     xreq.cpp \
+    xsub.cpp \
     zmq.cpp \
     zmq_connecter.cpp \
-    zmq_decoder.cpp \
-    zmq_encoder.cpp \
     zmq_engine.cpp \
     zmq_init.cpp \
     zmq_listener.cpp
@@ -178,69 +144,12 @@ else
 libzmq_la_LDFLAGS = -version-info @LTVER@ @LIBZMQ_EXTRA_LDFLAGS@
 endif
 
-if BUILD_PGM
-
-if ON_MINGW
-libpgm_diff_flags = \
-    -D_WIN32_WINNT=0x0501 \
-    -DCONFIG_16BIT_CHECKSUM \
-    -DCONFIG_HAVE_IFR_NETMASK \
-    -DCONFIG_BIND_INADDR_ANY \
-    -DCONFIG_GALOIS_MUL_LUT \
-    -DIF_NAMESIZE=256 \
-    -DPGM_GNUC_INTERNAL=G_GNUC_INTERNAL \
-    -DCONFIG_HAVE_WSACMSGHDR \
-    -DGETTEXT_PACKAGE='"pgm"' \
-    -DG_LOG_DOMAIN='"Pgm"'
-
-else
-libpgm_diff_flags = \
-    -D__need_IOV_MAX \
-    -DCONFIG_16BIT_CHECKSUM \
-    -DCONFIG_HAVE_PSELECT \
-    -DCONFIG_HAVE_POLL \
-    -DCONFIG_HAVE_PPOLL \
-    -DCONFIG_HAVE_EPOLL \
-    -DCONFIG_HAVE_CLOCK_GETTIME \
-    -DCONFIG_HAVE_CLOCK_NANOSLEEP \
-    -DCONFIG_HAVE_NANOSLEEP \
-    -DCONFIG_HAVE_USLEEP \
-    -DCONFIG_HAVE_RTC \
-    -DCONFIG_HAVE_TSC \
-    -DCONFIG_HAVE_IFR_NETMASK \
-    -DCONFIG_HAVE_GETIFADDRS \
-    -DCONFIG_HAVE_GETHOSTBYNAME2 \
-    -DCONFIG_HAVE_GETPROTOBYNAME_R \
-    -DCONFIG_BIND_INADDR_ANY \
-    -DCONFIG_GALOIS_MUL_LUT \
-    -DCONFIG_HAVE_MCAST_JOIN \
-    -DCONFIG_HAVE_IP_MREQN \
-    -DCONFIG_HAVE_SPRINTF_GROUPING \
-    -DCONFIG_HAVE_HPET \
-    -DPGM_GNUC_INTERNAL=G_GNUC_INTERNAL \
-    -DGETTEXT_PACKAGE='"pgm"' \
-    -DG_LOG_DOMAIN='"Pgm"'
-endif
-
-libzmq_la_CFLAGS = -I$(top_srcdir)/foreign/openpgm/@pgm_basename@/openpgm/pgm/include/ @LIBZMQ_EXTRA_CXXFLAGS@ \
-    -Wall \
-    -pedantic \
-    -std=gnu99 \
-    -fno-strict-aliasing \
-    --param max-inline-insns-single=600 \
-    -D_REENTRANT \
-    -D_GNU_SOURCE \
-    ${libpgm_diff_flags}
-
-libzmq_la_CXXFLAGS = -I$(top_srcdir)/foreign/openpgm/@pgm_basename@/openpgm/pgm/include/ \
-    @LIBZMQ_EXTRA_CXXFLAGS@
-endif
-
-if BUILD_NO_PGM
 libzmq_la_CXXFLAGS = @LIBZMQ_EXTRA_CXXFLAGS@
+
+if BUILD_PGM
+libzmq_la_CPPFLAGS = -I$(top_srcdir)/@pgm_srcdir@/include/
+libzmq_la_LIBADD = $(top_srcdir)/@pgm_srcdir@/libpgm_noinst.la
 endif
 
 dist-hook:
 		-rm $(distdir)/platform.hpp
-
-
diff --git a/src/Makefile.in b/src/Makefile.in
index 943e178..4202973 100644
--- a/src/Makefile.in
+++ b/src/Makefile.in
@@ -45,7 +45,8 @@ am__aclocal_m4_deps = $(top_srcdir)/config/libtool.m4 \
 	$(top_srcdir)/config/ltoptions.m4 \
 	$(top_srcdir)/config/ltsugar.m4 \
 	$(top_srcdir)/config/ltversion.m4 \
-	$(top_srcdir)/config/lt~obsolete.m4 $(top_srcdir)/configure.in
+	$(top_srcdir)/config/lt~obsolete.m4 $(top_srcdir)/acinclude.m4 \
+	$(top_srcdir)/configure.in
 am__configure_deps = $(am__aclocal_m4_deps) $(CONFIGURE_DEPENDENCIES) \
 	$(ACLOCAL_M4)
 mkinstalldirs = $(install_sh) -d
@@ -76,78 +77,80 @@ am__base_list = \
 am__installdirs = "$(DESTDIR)$(libdir)" "$(DESTDIR)$(pkgconfigdir)" \
 	"$(DESTDIR)$(includedir)"
 LTLIBRARIES = $(lib_LTLIBRARIES)
-libzmq_la_LIBADD =
-am_libzmq_la_OBJECTS = libzmq_la-app_thread.lo libzmq_la-command.lo \
-	libzmq_la-ctx.lo libzmq_la-devpoll.lo libzmq_la-push.lo \
-	libzmq_la-epoll.lo libzmq_la-err.lo libzmq_la-forwarder.lo \
-	libzmq_la-fq.lo libzmq_la-io_object.lo libzmq_la-io_thread.lo \
-	libzmq_la-ip.lo libzmq_la-kqueue.lo libzmq_la-lb.lo \
-	libzmq_la-msg_store.lo libzmq_la-object.lo \
-	libzmq_la-options.lo libzmq_la-owned.lo \
+@BUILD_PGM_TRUE@libzmq_la_DEPENDENCIES =  \
+@BUILD_PGM_TRUE@	$(top_srcdir)/@pgm_srcdir@/libpgm_noinst.la
+am_libzmq_la_OBJECTS = libzmq_la-clock.lo libzmq_la-command.lo \
+	libzmq_la-ctx.lo libzmq_la-connect_session.lo \
+	libzmq_la-decoder.lo libzmq_la-device.lo libzmq_la-devpoll.lo \
+	libzmq_la-dist.lo libzmq_la-encoder.lo libzmq_la-epoll.lo \
+	libzmq_la-err.lo libzmq_la-fq.lo libzmq_la-io_object.lo \
+	libzmq_la-io_thread.lo libzmq_la-ip.lo libzmq_la-kqueue.lo \
+	libzmq_la-lb.lo libzmq_la-mailbox.lo \
+	libzmq_la-named_session.lo libzmq_la-object.lo \
+	libzmq_la-options.lo libzmq_la-own.lo libzmq_la-pair.lo \
 	libzmq_la-pgm_receiver.lo libzmq_la-pgm_sender.lo \
-	libzmq_la-pgm_socket.lo libzmq_la-pair.lo \
-	libzmq_la-prefix_tree.lo libzmq_la-pipe.lo libzmq_la-poll.lo \
-	libzmq_la-pub.lo libzmq_la-queue.lo libzmq_la-rep.lo \
+	libzmq_la-pgm_socket.lo libzmq_la-pipe.lo libzmq_la-poll.lo \
+	libzmq_la-poller_base.lo libzmq_la-pull.lo libzmq_la-push.lo \
+	libzmq_la-reaper.lo libzmq_la-pub.lo libzmq_la-rep.lo \
 	libzmq_la-req.lo libzmq_la-select.lo libzmq_la-session.lo \
-	libzmq_la-signaler.lo libzmq_la-socket_base.lo \
-	libzmq_la-streamer.lo libzmq_la-sub.lo \
+	libzmq_la-socket_base.lo libzmq_la-sub.lo libzmq_la-swap.lo \
 	libzmq_la-tcp_connecter.lo libzmq_la-tcp_listener.lo \
-	libzmq_la-tcp_socket.lo libzmq_la-thread.lo libzmq_la-pull.lo \
-	libzmq_la-uuid.lo libzmq_la-xrep.lo libzmq_la-xreq.lo \
-	libzmq_la-zmq.lo libzmq_la-zmq_connecter.lo \
-	libzmq_la-zmq_decoder.lo libzmq_la-zmq_encoder.lo \
-	libzmq_la-zmq_engine.lo libzmq_la-zmq_init.lo \
-	libzmq_la-zmq_listener.lo
-@BUILD_PGM_TRUE@am__objects_1 = libzmq_la-packet.lo libzmq_la-time.lo \
-@BUILD_PGM_TRUE@	libzmq_la-if.lo libzmq_la-getifaddrs.lo \
-@BUILD_PGM_TRUE@	libzmq_la-getnodeaddr.lo \
-@BUILD_PGM_TRUE@	libzmq_la-indextoaddr.lo \
-@BUILD_PGM_TRUE@	libzmq_la-indextoname.lo \
-@BUILD_PGM_TRUE@	libzmq_la-nametoindex.lo \
-@BUILD_PGM_TRUE@	libzmq_la-inet_network.lo libzmq_la-md5.lo \
-@BUILD_PGM_TRUE@	libzmq_la-gsi.lo libzmq_la-tsi.lo \
-@BUILD_PGM_TRUE@	libzmq_la-signal.lo libzmq_la-txwi.lo \
-@BUILD_PGM_TRUE@	libzmq_la-rxwi.lo libzmq_la-transport.lo \
-@BUILD_PGM_TRUE@	libzmq_la-source.lo libzmq_la-receiver.lo \
-@BUILD_PGM_TRUE@	libzmq_la-recv.lo libzmq_la-pgm.lo \
-@BUILD_PGM_TRUE@	libzmq_la-timer.lo libzmq_la-net.lo \
-@BUILD_PGM_TRUE@	libzmq_la-rate_control.lo libzmq_la-async.lo \
-@BUILD_PGM_TRUE@	libzmq_la-checksum.lo \
-@BUILD_PGM_TRUE@	libzmq_la-reed_solomon.lo \
-@BUILD_PGM_TRUE@	libzmq_la-galois_tables.lo \
-@BUILD_PGM_TRUE@	libzmq_la-wsastrerror.lo \
-@BUILD_PGM_TRUE@	libzmq_la-glib-compat.lo \
-@BUILD_PGM_TRUE@	libzmq_la-backtrace.lo libzmq_la-log.lo \
-@BUILD_PGM_TRUE@	libzmq_la-sockaddr.lo libzmq_la-version.lo
-nodist_libzmq_la_OBJECTS = $(am__objects_1)
-libzmq_la_OBJECTS = $(am_libzmq_la_OBJECTS) \
-	$(nodist_libzmq_la_OBJECTS)
-libzmq_la_LINK = $(LIBTOOL) --tag=CXX $(AM_LIBTOOLFLAGS) \
+	libzmq_la-tcp_socket.lo libzmq_la-thread.lo \
+	libzmq_la-transient_session.lo libzmq_la-trie.lo \
+	libzmq_la-uuid.lo libzmq_la-xpub.lo libzmq_la-xrep.lo \
+	libzmq_la-xreq.lo libzmq_la-xsub.lo libzmq_la-zmq.lo \
+	libzmq_la-zmq_connecter.lo libzmq_la-zmq_engine.lo \
+	libzmq_la-zmq_init.lo libzmq_la-zmq_listener.lo
+libzmq_la_OBJECTS = $(am_libzmq_la_OBJECTS)
+AM_V_lt = $(am__v_lt_$(V))
+am__v_lt_ = $(am__v_lt_$(AM_DEFAULT_VERBOSITY))
+am__v_lt_0 = --silent
+libzmq_la_LINK = $(LIBTOOL) $(AM_V_lt) --tag=CXX $(AM_LIBTOOLFLAGS) \
 	$(LIBTOOLFLAGS) --mode=link $(CXXLD) $(libzmq_la_CXXFLAGS) \
 	$(CXXFLAGS) $(libzmq_la_LDFLAGS) $(LDFLAGS) -o $@
 DEFAULT_INCLUDES = -I.@am__isrc@
 depcomp = $(SHELL) $(top_srcdir)/config/depcomp
 am__depfiles_maybe = depfiles
 am__mv = mv -f
-COMPILE = $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) \
-	$(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS)
-LTCOMPILE = $(LIBTOOL) --tag=CC $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) \
-	--mode=compile $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) \
-	$(AM_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS)
-CCLD = $(CC)
-LINK = $(LIBTOOL) --tag=CC $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) \
-	--mode=link $(CCLD) $(AM_CFLAGS) $(CFLAGS) $(AM_LDFLAGS) \
-	$(LDFLAGS) -o $@
 CXXCOMPILE = $(CXX) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) \
 	$(AM_CPPFLAGS) $(CPPFLAGS) $(AM_CXXFLAGS) $(CXXFLAGS)
-LTCXXCOMPILE = $(LIBTOOL) --tag=CXX $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) \
-	--mode=compile $(CXX) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) \
-	$(AM_CPPFLAGS) $(CPPFLAGS) $(AM_CXXFLAGS) $(CXXFLAGS)
+LTCXXCOMPILE = $(LIBTOOL) $(AM_V_lt) --tag=CXX $(AM_LIBTOOLFLAGS) \
+	$(LIBTOOLFLAGS) --mode=compile $(CXX) $(DEFS) \
+	$(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) \
+	$(AM_CXXFLAGS) $(CXXFLAGS)
+AM_V_CXX = $(am__v_CXX_$(V))
+am__v_CXX_ = $(am__v_CXX_$(AM_DEFAULT_VERBOSITY))
+am__v_CXX_0 = @echo "  CXX   " $@;
+AM_V_at = $(am__v_at_$(V))
+am__v_at_ = $(am__v_at_$(AM_DEFAULT_VERBOSITY))
+am__v_at_0 = @
 CXXLD = $(CXX)
-CXXLINK = $(LIBTOOL) --tag=CXX $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) \
-	--mode=link $(CXXLD) $(AM_CXXFLAGS) $(CXXFLAGS) $(AM_LDFLAGS) \
-	$(LDFLAGS) -o $@
-SOURCES = $(libzmq_la_SOURCES) $(nodist_libzmq_la_SOURCES)
+CXXLINK = $(LIBTOOL) $(AM_V_lt) --tag=CXX $(AM_LIBTOOLFLAGS) \
+	$(LIBTOOLFLAGS) --mode=link $(CXXLD) $(AM_CXXFLAGS) \
+	$(CXXFLAGS) $(AM_LDFLAGS) $(LDFLAGS) -o $@
+AM_V_CXXLD = $(am__v_CXXLD_$(V))
+am__v_CXXLD_ = $(am__v_CXXLD_$(AM_DEFAULT_VERBOSITY))
+am__v_CXXLD_0 = @echo "  CXXLD " $@;
+COMPILE = $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) \
+	$(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS)
+LTCOMPILE = $(LIBTOOL) $(AM_V_lt) --tag=CC $(AM_LIBTOOLFLAGS) \
+	$(LIBTOOLFLAGS) --mode=compile $(CC) $(DEFS) \
+	$(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) \
+	$(AM_CFLAGS) $(CFLAGS)
+AM_V_CC = $(am__v_CC_$(V))
+am__v_CC_ = $(am__v_CC_$(AM_DEFAULT_VERBOSITY))
+am__v_CC_0 = @echo "  CC    " $@;
+CCLD = $(CC)
+LINK = $(LIBTOOL) $(AM_V_lt) --tag=CC $(AM_LIBTOOLFLAGS) \
+	$(LIBTOOLFLAGS) --mode=link $(CCLD) $(AM_CFLAGS) $(CFLAGS) \
+	$(AM_LDFLAGS) $(LDFLAGS) -o $@
+AM_V_CCLD = $(am__v_CCLD_$(V))
+am__v_CCLD_ = $(am__v_CCLD_$(AM_DEFAULT_VERBOSITY))
+am__v_CCLD_0 = @echo "  CCLD  " $@;
+AM_V_GEN = $(am__v_GEN_$(V))
+am__v_GEN_ = $(am__v_GEN_$(AM_DEFAULT_VERBOSITY))
+am__v_GEN_0 = @echo "  GEN   " $@;
+SOURCES = $(libzmq_la_SOURCES)
 DIST_SOURCES = $(libzmq_la_SOURCES)
 DATA = $(pkgconfig_DATA)
 HEADERS = $(include_HEADERS)
@@ -156,8 +159,10 @@ CTAGS = ctags
 DISTFILES = $(DIST_COMMON) $(DIST_SOURCES) $(TEXINFOS) $(EXTRA_DIST)
 ACLOCAL = @ACLOCAL@
 AMTAR = @AMTAR@
+AM_DEFAULT_VERBOSITY = @AM_DEFAULT_VERBOSITY@
 AR = @AR@
 AS = @AS@
+ASCIIDOC = @ASCIIDOC@
 AUTOCONF = @AUTOCONF@
 AUTOHEADER = @AUTOHEADER@
 AUTOMAKE = @AUTOMAKE@
@@ -183,8 +188,6 @@ ECHO_T = @ECHO_T@
 EGREP = @EGREP@
 EXEEXT = @EXEEXT@
 FGREP = @FGREP@
-GLIB_CFLAGS = @GLIB_CFLAGS@
-GLIB_LIBS = @GLIB_LIBS@
 GREP = @GREP@
 INSTALL = @INSTALL@
 INSTALL_DATA = @INSTALL_DATA@
@@ -196,6 +199,7 @@ LDFLAGS = @LDFLAGS@
 LIBOBJS = @LIBOBJS@
 LIBS = @LIBS@
 LIBTOOL = @LIBTOOL@
+LIBZMQ_EXTRA_CFLAGS = @LIBZMQ_EXTRA_CFLAGS@
 LIBZMQ_EXTRA_CXXFLAGS = @LIBZMQ_EXTRA_CXXFLAGS@
 LIBZMQ_EXTRA_LDFLAGS = @LIBZMQ_EXTRA_LDFLAGS@
 LIPO = @LIPO@
@@ -218,13 +222,13 @@ PACKAGE_TARNAME = @PACKAGE_TARNAME@
 PACKAGE_URL = @PACKAGE_URL@
 PACKAGE_VERSION = @PACKAGE_VERSION@
 PATH_SEPARATOR = @PATH_SEPARATOR@
-PKG_CONFIG = @PKG_CONFIG@
 RANLIB = @RANLIB@
 SED = @SED@
 SET_MAKE = @SET_MAKE@
 SHELL = @SHELL@
 STRIP = @STRIP@
 VERSION = @VERSION@
+XMLTO = @XMLTO@
 abs_builddir = @abs_builddir@
 abs_srcdir = @abs_srcdir@
 abs_top_builddir = @abs_top_builddir@
@@ -232,6 +236,8 @@ abs_top_srcdir = @abs_top_srcdir@
 ac_ct_CC = @ac_ct_CC@
 ac_ct_CXX = @ac_ct_CXX@
 ac_ct_DUMPBIN = @ac_ct_DUMPBIN@
+ac_zmq_have_asciidoc = @ac_zmq_have_asciidoc@
+ac_zmq_have_xmlto = @ac_zmq_have_xmlto@
 am__include = @am__include@
 am__leading_dot = @am__leading_dot@
 am__quote = @am__quote@
@@ -249,12 +255,6 @@ datarootdir = @datarootdir@
 docdir = @docdir@
 dvidir = @dvidir@
 exec_prefix = @exec_prefix@
-have_asciidoc = @have_asciidoc@
-have_gzip = @have_gzip@
-have_perl = @have_perl@
-have_pkg_config = @have_pkg_config@
-have_python = @have_python@
-have_xmlto = @have_xmlto@
 host = @host@
 host_alias = @host_alias@
 host_cpu = @host_cpu@
@@ -264,7 +264,6 @@ htmldir = @htmldir@
 includedir = @includedir@
 infodir = @infodir@
 install_sh = @install_sh@
-inttypes = @inttypes@
 libdir = @libdir@
 libexecdir = @libexecdir@
 localedir = @localedir@
@@ -275,13 +274,14 @@ mkdir_p = @mkdir_p@
 oldincludedir = @oldincludedir@
 pdfdir = @pdfdir@
 pgm_basename = @pgm_basename@
+pgm_srcdir = @pgm_srcdir@
 prefix = @prefix@
 program_transform_name = @program_transform_name@
 psdir = @psdir@
 sbindir = @sbindir@
 sharedstatedir = @sharedstatedir@
 srcdir = @srcdir@
-stdint = @stdint@
+subdirs = @subdirs@
 sysconfdir = @sysconfdir@
 target_alias = @target_alias@
 top_build_prefix = @top_build_prefix@
@@ -291,73 +291,41 @@ lib_LTLIBRARIES = libzmq.la
 pkgconfigdir = $(libdir)/pkgconfig
 pkgconfig_DATA = libzmq.pc
 include_HEADERS = ../include/zmq.h ../include/zmq.hpp ../include/zmq_utils.h
-@BUILD_PGM_TRUE@pgm_sources = ../foreign/openpgm/@pgm_basename@/openpgm/pgm/packet.c \
-@BUILD_PGM_TRUE@    ../foreign/openpgm/@pgm_basename@/openpgm/pgm/time.c \
-@BUILD_PGM_TRUE@    ../foreign/openpgm/@pgm_basename@/openpgm/pgm/if.c \
-@BUILD_PGM_TRUE@    ../foreign/openpgm/@pgm_basename@/openpgm/pgm/getifaddrs.c \
-@BUILD_PGM_TRUE@    ../foreign/openpgm/@pgm_basename@/openpgm/pgm/getnodeaddr.c \
-@BUILD_PGM_TRUE@    ../foreign/openpgm/@pgm_basename@/openpgm/pgm/indextoaddr.c \
-@BUILD_PGM_TRUE@    ../foreign/openpgm/@pgm_basename@/openpgm/pgm/indextoname.c \
-@BUILD_PGM_TRUE@    ../foreign/openpgm/@pgm_basename@/openpgm/pgm/nametoindex.c \
-@BUILD_PGM_TRUE@    ../foreign/openpgm/@pgm_basename@/openpgm/pgm/inet_network.c \
-@BUILD_PGM_TRUE@    ../foreign/openpgm/@pgm_basename@/openpgm/pgm/md5.c \
-@BUILD_PGM_TRUE@    ../foreign/openpgm/@pgm_basename@/openpgm/pgm/gsi.c \
-@BUILD_PGM_TRUE@    ../foreign/openpgm/@pgm_basename@/openpgm/pgm/tsi.c \
-@BUILD_PGM_TRUE@    ../foreign/openpgm/@pgm_basename@/openpgm/pgm/signal.c \
-@BUILD_PGM_TRUE@    ../foreign/openpgm/@pgm_basename@/openpgm/pgm/txwi.c \
-@BUILD_PGM_TRUE@    ../foreign/openpgm/@pgm_basename@/openpgm/pgm/rxwi.c \
-@BUILD_PGM_TRUE@    ../foreign/openpgm/@pgm_basename@/openpgm/pgm/transport.c \
-@BUILD_PGM_TRUE@    ../foreign/openpgm/@pgm_basename@/openpgm/pgm/source.c \
-@BUILD_PGM_TRUE@    ../foreign/openpgm/@pgm_basename@/openpgm/pgm/receiver.c \
-@BUILD_PGM_TRUE@    ../foreign/openpgm/@pgm_basename@/openpgm/pgm/recv.c \
-@BUILD_PGM_TRUE@    ../foreign/openpgm/@pgm_basename@/openpgm/pgm/pgm.c \
-@BUILD_PGM_TRUE@    ../foreign/openpgm/@pgm_basename@/openpgm/pgm/timer.c \
-@BUILD_PGM_TRUE@    ../foreign/openpgm/@pgm_basename@/openpgm/pgm/net.c \
-@BUILD_PGM_TRUE@    ../foreign/openpgm/@pgm_basename@/openpgm/pgm/rate_control.c \
-@BUILD_PGM_TRUE@    ../foreign/openpgm/@pgm_basename@/openpgm/pgm/async.c \
-@BUILD_PGM_TRUE@    ../foreign/openpgm/@pgm_basename@/openpgm/pgm/checksum.c \
-@BUILD_PGM_TRUE@    ../foreign/openpgm/@pgm_basename@/openpgm/pgm/reed_solomon.c \
-@BUILD_PGM_TRUE@    ../foreign/openpgm/@pgm_basename@/openpgm/pgm/galois_tables.c \
-@BUILD_PGM_TRUE@    ../foreign/openpgm/@pgm_basename@/openpgm/pgm/wsastrerror.c \
-@BUILD_PGM_TRUE@    ../foreign/openpgm/@pgm_basename@/openpgm/pgm/glib-compat.c \
-@BUILD_PGM_TRUE@    ../foreign/openpgm/@pgm_basename@/openpgm/pgm/backtrace.c \
-@BUILD_PGM_TRUE@    ../foreign/openpgm/@pgm_basename@/openpgm/pgm/log.c \
-@BUILD_PGM_TRUE@    ../foreign/openpgm/@pgm_basename@/openpgm/pgm/sockaddr.c \
-@BUILD_PGM_TRUE@    ../foreign/openpgm/@pgm_basename@/openpgm/pgm/version.c
-
-nodist_libzmq_la_SOURCES = $(pgm_sources)
-libzmq_la_SOURCES = app_thread.hpp \
+libzmq_la_SOURCES = \
+    array.hpp \
     atomic_counter.hpp \
     atomic_ptr.hpp \
     blob.hpp \
+    clock.hpp \
     command.hpp \
     config.hpp \
+    connect_session.hpp \
     ctx.hpp \
     decoder.hpp \
+    device.hpp \
     devpoll.hpp \
-    push.hpp \
+    dist.hpp \
     encoder.hpp \
     epoll.hpp \
     err.hpp \
     fd.hpp \
-    forwarder.hpp \
     fq.hpp \
     i_inout.hpp \
     io_object.hpp \
     io_thread.hpp \
     ip.hpp \
-    i_endpoint.hpp \
     i_engine.hpp \
     i_poll_events.hpp \
     kqueue.hpp \
     lb.hpp \
     likely.hpp \
+    mailbox.hpp \
     msg_content.hpp \
-    msg_store.hpp \
     mutex.hpp \
+    named_session.hpp \
     object.hpp \
     options.hpp \
-    owned.hpp \
+    own.hpp \
     pgm_receiver.hpp \
     pgm_sender.hpp \
     pgm_socket.hpp \
@@ -365,150 +333,107 @@ libzmq_la_SOURCES = app_thread.hpp \
     platform.hpp \
     poll.hpp \
     poller.hpp \
+    poller_base.hpp \
     pair.hpp \
-    prefix_tree.hpp \
     pub.hpp \
-    queue.hpp \
+    pull.hpp \
+    push.hpp \
+    reaper.hpp \
     rep.hpp \
     req.hpp \
     select.hpp \
+    semaphore.hpp \
     session.hpp \
-    signaler.hpp \
     socket_base.hpp \
     stdint.hpp \
-    streamer.hpp \
     sub.hpp \
+    swap.hpp \
     tcp_connecter.hpp \
     tcp_listener.hpp \
     tcp_socket.hpp \
     thread.hpp \
-    pull.hpp \
+    transient_session.hpp \
+    trie.hpp \
     uuid.hpp \
     windows.hpp \
     wire.hpp \
+    xpub.hpp \
     xrep.hpp \
     xreq.hpp \
-    yarray.hpp \
-    yarray_item.hpp \
+    xsub.hpp \
     ypipe.hpp \
     yqueue.hpp \
     zmq_connecter.hpp \
-    zmq_decoder.hpp \
-    zmq_encoder.hpp \
     zmq_engine.hpp \
     zmq_init.hpp \
     zmq_listener.hpp \
-    app_thread.cpp \
+    clock.cpp \
     command.cpp \
     ctx.cpp \
+    connect_session.cpp \
+    decoder.cpp \
+    device.cpp \
     devpoll.cpp \
-    push.cpp \
+    dist.cpp \
+    encoder.cpp \
     epoll.cpp \
     err.cpp \
-    forwarder.cpp \
     fq.cpp \
     io_object.cpp \
     io_thread.cpp \
     ip.cpp \
     kqueue.cpp \
     lb.cpp \
-    msg_store.cpp \
+    mailbox.cpp \
+    named_session.cpp \
     object.cpp \
     options.cpp \
-    owned.cpp \
+    own.cpp \
+    pair.cpp \
     pgm_receiver.cpp \
     pgm_sender.cpp \
     pgm_socket.cpp \
-    pair.cpp \
-    prefix_tree.cpp \
     pipe.cpp \
     poll.cpp \
+    poller_base.cpp \
+    pull.cpp \
+    push.cpp \
+    reaper.cpp \
     pub.cpp \
-    queue.cpp \
     rep.cpp \
     req.cpp \
     select.cpp \
     session.cpp \
-    signaler.cpp \
     socket_base.cpp \
-    streamer.cpp \
     sub.cpp \
+    swap.cpp \
     tcp_connecter.cpp \
     tcp_listener.cpp \
     tcp_socket.cpp \
     thread.cpp \
-    pull.cpp \
+    transient_session.cpp \
+    trie.cpp \
     uuid.cpp \
+    xpub.cpp \
     xrep.cpp \
     xreq.cpp \
+    xsub.cpp \
     zmq.cpp \
     zmq_connecter.cpp \
-    zmq_decoder.cpp \
-    zmq_encoder.cpp \
     zmq_engine.cpp \
     zmq_init.cpp \
     zmq_listener.cpp
 
 @ON_MINGW_FALSE@libzmq_la_LDFLAGS = -version-info @LTVER@ @LIBZMQ_EXTRA_LDFLAGS@
 @ON_MINGW_TRUE@libzmq_la_LDFLAGS = -no-undefined -avoid-version -version-info @LTVER@ @LIBZMQ_EXTRA_LDFLAGS@
-@BUILD_PGM_TRUE@@ON_MINGW_FALSE@libpgm_diff_flags = \
-@BUILD_PGM_TRUE@@ON_MINGW_FALSE@    -D__need_IOV_MAX \
-@BUILD_PGM_TRUE@@ON_MINGW_FALSE@    -DCONFIG_16BIT_CHECKSUM \
-@BUILD_PGM_TRUE@@ON_MINGW_FALSE@    -DCONFIG_HAVE_PSELECT \
-@BUILD_PGM_TRUE@@ON_MINGW_FALSE@    -DCONFIG_HAVE_POLL \
-@BUILD_PGM_TRUE@@ON_MINGW_FALSE@    -DCONFIG_HAVE_PPOLL \
-@BUILD_PGM_TRUE@@ON_MINGW_FALSE@    -DCONFIG_HAVE_EPOLL \
-@BUILD_PGM_TRUE@@ON_MINGW_FALSE@    -DCONFIG_HAVE_CLOCK_GETTIME \
-@BUILD_PGM_TRUE@@ON_MINGW_FALSE@    -DCONFIG_HAVE_CLOCK_NANOSLEEP \
-@BUILD_PGM_TRUE@@ON_MINGW_FALSE@    -DCONFIG_HAVE_NANOSLEEP \
-@BUILD_PGM_TRUE@@ON_MINGW_FALSE@    -DCONFIG_HAVE_USLEEP \
-@BUILD_PGM_TRUE@@ON_MINGW_FALSE@    -DCONFIG_HAVE_RTC \
-@BUILD_PGM_TRUE@@ON_MINGW_FALSE@    -DCONFIG_HAVE_TSC \
-@BUILD_PGM_TRUE@@ON_MINGW_FALSE@    -DCONFIG_HAVE_IFR_NETMASK \
-@BUILD_PGM_TRUE@@ON_MINGW_FALSE@    -DCONFIG_HAVE_GETIFADDRS \
-@BUILD_PGM_TRUE@@ON_MINGW_FALSE@    -DCONFIG_HAVE_GETHOSTBYNAME2 \
-@BUILD_PGM_TRUE@@ON_MINGW_FALSE@    -DCONFIG_HAVE_GETPROTOBYNAME_R \
-@BUILD_PGM_TRUE@@ON_MINGW_FALSE@    -DCONFIG_BIND_INADDR_ANY \
-@BUILD_PGM_TRUE@@ON_MINGW_FALSE@    -DCONFIG_GALOIS_MUL_LUT \
-@BUILD_PGM_TRUE@@ON_MINGW_FALSE@    -DCONFIG_HAVE_MCAST_JOIN \
-@BUILD_PGM_TRUE@@ON_MINGW_FALSE@    -DCONFIG_HAVE_IP_MREQN \
-@BUILD_PGM_TRUE@@ON_MINGW_FALSE@    -DCONFIG_HAVE_SPRINTF_GROUPING \
-@BUILD_PGM_TRUE@@ON_MINGW_FALSE@    -DCONFIG_HAVE_HPET \
-@BUILD_PGM_TRUE@@ON_MINGW_FALSE@    -DPGM_GNUC_INTERNAL=G_GNUC_INTERNAL \
-@BUILD_PGM_TRUE@@ON_MINGW_FALSE@    -DGETTEXT_PACKAGE='"pgm"' \
-@BUILD_PGM_TRUE@@ON_MINGW_FALSE@    -DG_LOG_DOMAIN='"Pgm"'
-
-@BUILD_PGM_TRUE@@ON_MINGW_TRUE@libpgm_diff_flags = \
-@BUILD_PGM_TRUE@@ON_MINGW_TRUE@    -D_WIN32_WINNT=0x0501 \
-@BUILD_PGM_TRUE@@ON_MINGW_TRUE@    -DCONFIG_16BIT_CHECKSUM \
-@BUILD_PGM_TRUE@@ON_MINGW_TRUE@    -DCONFIG_HAVE_IFR_NETMASK \
-@BUILD_PGM_TRUE@@ON_MINGW_TRUE@    -DCONFIG_BIND_INADDR_ANY \
-@BUILD_PGM_TRUE@@ON_MINGW_TRUE@    -DCONFIG_GALOIS_MUL_LUT \
-@BUILD_PGM_TRUE@@ON_MINGW_TRUE@    -DIF_NAMESIZE=256 \
-@BUILD_PGM_TRUE@@ON_MINGW_TRUE@    -DPGM_GNUC_INTERNAL=G_GNUC_INTERNAL \
-@BUILD_PGM_TRUE@@ON_MINGW_TRUE@    -DCONFIG_HAVE_WSACMSGHDR \
-@BUILD_PGM_TRUE@@ON_MINGW_TRUE@    -DGETTEXT_PACKAGE='"pgm"' \
-@BUILD_PGM_TRUE@@ON_MINGW_TRUE@    -DG_LOG_DOMAIN='"Pgm"'
-
-@BUILD_PGM_TRUE@libzmq_la_CFLAGS = -I$(top_srcdir)/foreign/openpgm/@pgm_basename@/openpgm/pgm/include/ @LIBZMQ_EXTRA_CXXFLAGS@ \
-@BUILD_PGM_TRUE@    -Wall \
-@BUILD_PGM_TRUE@    -pedantic \
-@BUILD_PGM_TRUE@    -std=gnu99 \
-@BUILD_PGM_TRUE@    -fno-strict-aliasing \
-@BUILD_PGM_TRUE@    --param max-inline-insns-single=600 \
-@BUILD_PGM_TRUE@    -D_REENTRANT \
-@BUILD_PGM_TRUE@    -D_GNU_SOURCE \
-@BUILD_PGM_TRUE@    ${libpgm_diff_flags}
-
-@BUILD_NO_PGM_TRUE@libzmq_la_CXXFLAGS = @LIBZMQ_EXTRA_CXXFLAGS@
-@BUILD_PGM_TRUE@libzmq_la_CXXFLAGS = -I$(top_srcdir)/foreign/openpgm/@pgm_basename@/openpgm/pgm/include/ \
-@BUILD_PGM_TRUE@    @LIBZMQ_EXTRA_CXXFLAGS@
-
+libzmq_la_CXXFLAGS = @LIBZMQ_EXTRA_CXXFLAGS@
+@BUILD_PGM_TRUE@libzmq_la_CPPFLAGS = -I$(top_srcdir)/@pgm_srcdir@/include/
+@BUILD_PGM_TRUE@libzmq_la_LIBADD = $(top_srcdir)/@pgm_srcdir@/libpgm_noinst.la
 all: platform.hpp
 	$(MAKE) $(AM_MAKEFLAGS) all-am
 
 .SUFFIXES:
-.SUFFIXES: .c .cpp .lo .o .obj
+.SUFFIXES: .cpp .lo .o .obj
 $(srcdir)/Makefile.in:  $(srcdir)/Makefile.am  $(am__configure_deps)
 	@for dep in $?; do \
 	  case '$(am__configure_deps)' in \
@@ -590,7 +515,7 @@ clean-libLTLIBRARIES:
 	  rm -f "$${dir}/so_locations"; \
 	done
 libzmq.la: $(libzmq_la_OBJECTS) $(libzmq_la_DEPENDENCIES) 
-	$(libzmq_la_LINK) -rpath $(libdir) $(libzmq_la_OBJECTS) $(libzmq_la_LIBADD) $(LIBS)
+	$(AM_V_CXXLD)$(libzmq_la_LINK) -rpath $(libdir) $(libzmq_la_OBJECTS) $(libzmq_la_LIBADD) $(LIBS)
 
 mostlyclean-compile:
 	-rm -f *.$(OBJEXT)
@@ -598,712 +523,534 @@ mostlyclean-compile:
 distclean-compile:
 	-rm -f *.tab.c
 
-@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libzmq_la-app_thread.Plo@am__quote@
-@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libzmq_la-async.Plo@am__quote@
-@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libzmq_la-backtrace.Plo@am__quote@
-@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libzmq_la-checksum.Plo@am__quote@
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libzmq_la-clock.Plo@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libzmq_la-command.Plo@am__quote@
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libzmq_la-connect_session.Plo@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libzmq_la-ctx.Plo@am__quote@
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libzmq_la-decoder.Plo@am__quote@
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libzmq_la-device.Plo@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libzmq_la-devpoll.Plo@am__quote@
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libzmq_la-dist.Plo@am__quote@
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libzmq_la-encoder.Plo@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libzmq_la-epoll.Plo@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libzmq_la-err.Plo@am__quote@
-@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libzmq_la-forwarder.Plo@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libzmq_la-fq.Plo@am__quote@
-@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libzmq_la-galois_tables.Plo@am__quote@
-@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libzmq_la-getifaddrs.Plo@am__quote@
-@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libzmq_la-getnodeaddr.Plo@am__quote@
-@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libzmq_la-glib-compat.Plo@am__quote@
-@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libzmq_la-gsi.Plo@am__quote@
-@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libzmq_la-if.Plo@am__quote@
-@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libzmq_la-indextoaddr.Plo@am__quote@
-@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libzmq_la-indextoname.Plo@am__quote@
-@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libzmq_la-inet_network.Plo@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libzmq_la-io_object.Plo@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libzmq_la-io_thread.Plo@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libzmq_la-ip.Plo@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libzmq_la-kqueue.Plo@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libzmq_la-lb.Plo@am__quote@
-@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libzmq_la-log.Plo@am__quote@
-@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libzmq_la-md5.Plo@am__quote@
-@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libzmq_la-msg_store.Plo@am__quote@
-@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libzmq_la-nametoindex.Plo@am__quote@
-@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libzmq_la-net.Plo@am__quote@
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libzmq_la-mailbox.Plo@am__quote@
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libzmq_la-named_session.Plo@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libzmq_la-object.Plo@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libzmq_la-options.Plo@am__quote@
-@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libzmq_la-owned.Plo@am__quote@
-@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libzmq_la-packet.Plo@am__quote@
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libzmq_la-own.Plo@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libzmq_la-pair.Plo@am__quote@
-@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libzmq_la-pgm.Plo@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libzmq_la-pgm_receiver.Plo@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libzmq_la-pgm_sender.Plo@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libzmq_la-pgm_socket.Plo@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libzmq_la-pipe.Plo@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libzmq_la-poll.Plo@am__quote@
-@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libzmq_la-prefix_tree.Plo@am__quote@
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libzmq_la-poller_base.Plo@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libzmq_la-pub.Plo@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libzmq_la-pull.Plo@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libzmq_la-push.Plo@am__quote@
-@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libzmq_la-queue.Plo@am__quote@
-@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libzmq_la-rate_control.Plo@am__quote@
-@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libzmq_la-receiver.Plo@am__quote@
-@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libzmq_la-recv.Plo@am__quote@
-@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libzmq_la-reed_solomon.Plo@am__quote@
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libzmq_la-reaper.Plo@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libzmq_la-rep.Plo@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libzmq_la-req.Plo@am__quote@
-@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libzmq_la-rxwi.Plo@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libzmq_la-select.Plo@am__quote@
 @AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libzmq_la-session.Plo@am__quote@
-@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libzmq_la-signal.Plo@am__quote@
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 libzmq_la-devpoll.lo: devpoll.cpp
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 libzmq_la-epoll.lo: epoll.cpp
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 libzmq_la-err.lo: err.cpp
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 libzmq_la-fq.lo: fq.cpp
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 libzmq_la-io_object.lo: io_object.cpp
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 libzmq_la-io_thread.lo: io_thread.cpp
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 libzmq_la-ip.lo: ip.cpp
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 libzmq_la-kqueue.lo: kqueue.cpp
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 libzmq_la-lb.lo: lb.cpp
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 libzmq_la-object.lo: object.cpp
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 libzmq_la-options.lo: options.cpp
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 libzmq_la-pgm_receiver.lo: pgm_receiver.cpp
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 libzmq_la-pipe.lo: pipe.cpp
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 libzmq_la-poll.lo: poll.cpp
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 libzmq_la-select.lo: select.cpp
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 libzmq_la-session.lo: session.cpp
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 libzmq_la-socket_base.lo: socket_base.cpp
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 libzmq_la-sub.lo: sub.cpp
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+libzmq_la-swap.lo: swap.cpp
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 libzmq_la-tcp_connecter.lo: tcp_connecter.cpp
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 libzmq_la-tcp_listener.lo: tcp_listener.cpp
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 libzmq_la-tcp_socket.lo: tcp_socket.cpp
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-@am__fastdepCXX_TRUE@	$(am__mv) $(DEPDIR)/libzmq_la-tcp_socket.Tpo $(DEPDIR)/libzmq_la-tcp_socket.Plo
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 libzmq_la-thread.lo: thread.cpp
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+@am__fastdepCXX_FALSE@	$(LIBTOOL) $(AM_V_lt) --tag=CXX $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=compile $(CXX) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libzmq_la_CPPFLAGS) $(CPPFLAGS) $(libzmq_la_CXXFLAGS) $(CXXFLAGS) -c -o libzmq_la-zmq_connecter.lo `test -f 'zmq_connecter.cpp' || echo '$(srcdir)/'`zmq_connecter.cpp
 
 libzmq_la-zmq_engine.lo: zmq_engine.cpp
-@am__fastdepCXX_TRUE@	$(LIBTOOL)  --tag=CXX $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=compile $(CXX) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(libzmq_la_CXXFLAGS) $(CXXFLAGS) -MT libzmq_la-zmq_engine.lo -MD -MP -MF $(DEPDIR)/libzmq_la-zmq_engine.Tpo -c -o libzmq_la-zmq_engine.lo `test -f 'zmq_engine.cpp' || echo '$(srcdir)/'`zmq_engine.cpp
-@am__fastdepCXX_TRUE@	$(am__mv) $(DEPDIR)/libzmq_la-zmq_engine.Tpo $(DEPDIR)/libzmq_la-zmq_engine.Plo
+@am__fastdepCXX_TRUE@	$(AM_V_CXX)$(LIBTOOL) $(AM_V_lt) --tag=CXX $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=compile $(CXX) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libzmq_la_CPPFLAGS) $(CPPFLAGS) $(libzmq_la_CXXFLAGS) $(CXXFLAGS) -MT libzmq_la-zmq_engine.lo -MD -MP -MF $(DEPDIR)/libzmq_la-zmq_engine.Tpo -c -o libzmq_la-zmq_engine.lo `test -f 'zmq_engine.cpp' || echo '$(srcdir)/'`zmq_engine.cpp
+@am__fastdepCXX_TRUE@	$(AM_V_at)$(am__mv) $(DEPDIR)/libzmq_la-zmq_engine.Tpo $(DEPDIR)/libzmq_la-zmq_engine.Plo
+@am__fastdepCXX_FALSE@	$(AM_V_CXX) @AM_BACKSLASH@
 @AMDEP_TRUE@@am__fastdepCXX_FALSE@	source='zmq_engine.cpp' object='libzmq_la-zmq_engine.lo' libtool=yes @AMDEPBACKSLASH@
 @AMDEP_TRUE@@am__fastdepCXX_FALSE@	DEPDIR=$(DEPDIR) $(CXXDEPMODE) $(depcomp) @AMDEPBACKSLASH@
-@am__fastdepCXX_FALSE@	$(LIBTOOL)  --tag=CXX $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=compile $(CXX) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(libzmq_la_CXXFLAGS) $(CXXFLAGS) -c -o libzmq_la-zmq_engine.lo `test -f 'zmq_engine.cpp' || echo '$(srcdir)/'`zmq_engine.cpp
+@am__fastdepCXX_FALSE@	$(LIBTOOL) $(AM_V_lt) --tag=CXX $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=compile $(CXX) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libzmq_la_CPPFLAGS) $(CPPFLAGS) $(libzmq_la_CXXFLAGS) $(CXXFLAGS) -c -o libzmq_la-zmq_engine.lo `test -f 'zmq_engine.cpp' || echo '$(srcdir)/'`zmq_engine.cpp
 
 libzmq_la-zmq_init.lo: zmq_init.cpp
-@am__fastdepCXX_TRUE@	$(LIBTOOL)  --tag=CXX $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=compile $(CXX) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(libzmq_la_CXXFLAGS) $(CXXFLAGS) -MT libzmq_la-zmq_init.lo -MD -MP -MF $(DEPDIR)/libzmq_la-zmq_init.Tpo -c -o libzmq_la-zmq_init.lo `test -f 'zmq_init.cpp' || echo '$(srcdir)/'`zmq_init.cpp
-@am__fastdepCXX_TRUE@	$(am__mv) $(DEPDIR)/libzmq_la-zmq_init.Tpo $(DEPDIR)/libzmq_la-zmq_init.Plo
+@am__fastdepCXX_TRUE@	$(AM_V_CXX)$(LIBTOOL) $(AM_V_lt) --tag=CXX $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=compile $(CXX) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libzmq_la_CPPFLAGS) $(CPPFLAGS) $(libzmq_la_CXXFLAGS) $(CXXFLAGS) -MT libzmq_la-zmq_init.lo -MD -MP -MF $(DEPDIR)/libzmq_la-zmq_init.Tpo -c -o libzmq_la-zmq_init.lo `test -f 'zmq_init.cpp' || echo '$(srcdir)/'`zmq_init.cpp
+@am__fastdepCXX_TRUE@	$(AM_V_at)$(am__mv) $(DEPDIR)/libzmq_la-zmq_init.Tpo $(DEPDIR)/libzmq_la-zmq_init.Plo
+@am__fastdepCXX_FALSE@	$(AM_V_CXX) @AM_BACKSLASH@
 @AMDEP_TRUE@@am__fastdepCXX_FALSE@	source='zmq_init.cpp' object='libzmq_la-zmq_init.lo' libtool=yes @AMDEPBACKSLASH@
 @AMDEP_TRUE@@am__fastdepCXX_FALSE@	DEPDIR=$(DEPDIR) $(CXXDEPMODE) $(depcomp) @AMDEPBACKSLASH@
-@am__fastdepCXX_FALSE@	$(LIBTOOL)  --tag=CXX $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=compile $(CXX) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(libzmq_la_CXXFLAGS) $(CXXFLAGS) -c -o libzmq_la-zmq_init.lo `test -f 'zmq_init.cpp' || echo '$(srcdir)/'`zmq_init.cpp
+@am__fastdepCXX_FALSE@	$(LIBTOOL) $(AM_V_lt) --tag=CXX $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=compile $(CXX) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libzmq_la_CPPFLAGS) $(CPPFLAGS) $(libzmq_la_CXXFLAGS) $(CXXFLAGS) -c -o libzmq_la-zmq_init.lo `test -f 'zmq_init.cpp' || echo '$(srcdir)/'`zmq_init.cpp
 
 libzmq_la-zmq_listener.lo: zmq_listener.cpp
-@am__fastdepCXX_TRUE@	$(LIBTOOL)  --tag=CXX $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=compile $(CXX) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(libzmq_la_CXXFLAGS) $(CXXFLAGS) -MT libzmq_la-zmq_listener.lo -MD -MP -MF $(DEPDIR)/libzmq_la-zmq_listener.Tpo -c -o libzmq_la-zmq_listener.lo `test -f 'zmq_listener.cpp' || echo '$(srcdir)/'`zmq_listener.cpp
-@am__fastdepCXX_TRUE@	$(am__mv) $(DEPDIR)/libzmq_la-zmq_listener.Tpo $(DEPDIR)/libzmq_la-zmq_listener.Plo
+@am__fastdepCXX_TRUE@	$(AM_V_CXX)$(LIBTOOL) $(AM_V_lt) --tag=CXX $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=compile $(CXX) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libzmq_la_CPPFLAGS) $(CPPFLAGS) $(libzmq_la_CXXFLAGS) $(CXXFLAGS) -MT libzmq_la-zmq_listener.lo -MD -MP -MF $(DEPDIR)/libzmq_la-zmq_listener.Tpo -c -o libzmq_la-zmq_listener.lo `test -f 'zmq_listener.cpp' || echo '$(srcdir)/'`zmq_listener.cpp
+@am__fastdepCXX_TRUE@	$(AM_V_at)$(am__mv) $(DEPDIR)/libzmq_la-zmq_listener.Tpo $(DEPDIR)/libzmq_la-zmq_listener.Plo
+@am__fastdepCXX_FALSE@	$(AM_V_CXX) @AM_BACKSLASH@
 @AMDEP_TRUE@@am__fastdepCXX_FALSE@	source='zmq_listener.cpp' object='libzmq_la-zmq_listener.lo' libtool=yes @AMDEPBACKSLASH@
 @AMDEP_TRUE@@am__fastdepCXX_FALSE@	DEPDIR=$(DEPDIR) $(CXXDEPMODE) $(depcomp) @AMDEPBACKSLASH@
-@am__fastdepCXX_FALSE@	$(LIBTOOL)  --tag=CXX $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=compile $(CXX) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) $(libzmq_la_CXXFLAGS) $(CXXFLAGS) -c -o libzmq_la-zmq_listener.lo `test -f 'zmq_listener.cpp' || echo '$(srcdir)/'`zmq_listener.cpp
+@am__fastdepCXX_FALSE@	$(LIBTOOL) $(AM_V_lt) --tag=CXX $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=compile $(CXX) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libzmq_la_CPPFLAGS) $(CPPFLAGS) $(libzmq_la_CXXFLAGS) $(CXXFLAGS) -c -o libzmq_la-zmq_listener.lo `test -f 'zmq_listener.cpp' || echo '$(srcdir)/'`zmq_listener.cpp
 
 mostlyclean-libtool:
 	-rm -f *.lo
@@ -1559,12 +1306,6 @@ uninstall-am: uninstall-includeHEADERS uninstall-libLTLIBRARIES \
 	uninstall-libLTLIBRARIES uninstall-pkgconfigDATA
 
 
-@BUILD_PGM_TRUE@../foreign/openpgm/@pgm_basename@/openpgm/pgm/version.c: ../foreign/openpgm/@pgm_basename@/openpgm/pgm/version_generator.py
-@BUILD_PGM_TRUE@	python ../foreign/openpgm/@pgm_basename@/openpgm/pgm/version_generator.py > $@
-
-@BUILD_PGM_TRUE@../foreign/openpgm/@pgm_basename@/openpgm/pgm/galois_tables.c: ../foreign/openpgm/@pgm_basename@/openpgm/pgm/galois_generator.pl
-@BUILD_PGM_TRUE@	perl ../foreign/openpgm/@pgm_basename@/openpgm/pgm/galois_generator.pl > $@
-
 dist-hook:
 		-rm $(distdir)/platform.hpp
 
diff --git a/src/app_thread.cpp b/src/app_thread.cpp
deleted file mode 100644
index fc9bc1f..0000000
--- a/src/app_thread.cpp
+++ /dev/null
@@ -1,197 +0,0 @@
-/*
-    Copyright (c) 2007-2010 iMatix Corporation
-
-    This file is part of 0MQ.
-
-    0MQ is free software; you can redistribute it and/or modify it under
-    the terms of the Lesser GNU General Public License as published by
-    the Free Software Foundation; either version 3 of the License, or
-    (at your option) any later version.
-
-    0MQ is distributed in the hope that it will be useful,
-    but WITHOUT ANY WARRANTY; without even the implied warranty of
-    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    Lesser GNU General Public License for more details.
-
-    You should have received a copy of the Lesser GNU General Public License
-    along with this program.  If not, see <http://www.gnu.org/licenses/>.
-*/
-
-#include <new>
-#include <algorithm>
-
-#include "../include/zmq.h"
-
-#include "platform.hpp"
-
-#if defined ZMQ_HAVE_WINDOWS
-#include "windows.hpp"
-#if defined _MSC_VER
-#include <intrin.h>
-#endif
-#else
-#include <unistd.h>
-#endif
-
-#include "app_thread.hpp"
-#include "ctx.hpp"
-#include "err.hpp"
-#include "pipe.hpp"
-#include "config.hpp"
-#include "socket_base.hpp"
-#include "pair.hpp"
-#include "pub.hpp"
-#include "sub.hpp"
-#include "req.hpp"
-#include "rep.hpp"
-#include "xreq.hpp"
-#include "xrep.hpp"
-#include "pull.hpp"
-#include "push.hpp"
-
-//  If the RDTSC is available we use it to prevent excessive
-//  polling for commands. The nice thing here is that it will work on any
-//  system with x86 architecture and gcc or MSVC compiler.
-#if (defined __GNUC__ && (defined __i386__ || defined __x86_64__)) ||\
-    (defined _MSC_VER && (defined _M_IX86 || defined _M_X64))
-#define ZMQ_DELAY_COMMANDS
-#endif
-
-zmq::app_thread_t::app_thread_t (ctx_t *ctx_,
-        uint32_t thread_slot_) :
-    object_t (ctx_, thread_slot_),
-    last_processing_time (0),
-    terminated (false)
-{
-}
-
-zmq::app_thread_t::~app_thread_t ()
-{
-    zmq_assert (sockets.empty ());
-}
-
-void zmq::app_thread_t::stop ()
-{
-    send_stop ();
-}
-
-zmq::signaler_t *zmq::app_thread_t::get_signaler ()
-{
-    return &signaler;
-}
-
-bool zmq::app_thread_t::process_commands (bool block_, bool throttle_)
-{
-    bool received;
-    command_t cmd;
-    if (block_) {
-        received = signaler.recv (&cmd, true);
-        zmq_assert (received);
-    }   
-    else {
-
-#if defined ZMQ_DELAY_COMMANDS
-        //  Optimised version of command processing - it doesn't have to check
-        //  for incoming commands each time. It does so only if certain time
-        //  elapsed since last command processing. Command delay varies
-        //  depending on CPU speed: It's ~1ms on 3GHz CPU, ~2ms on 1.5GHz CPU
-        //  etc. The optimisation makes sense only on platforms where getting
-        //  a timestamp is a very cheap operation (tens of nanoseconds).
-        if (throttle_) {
-
-            //  Get timestamp counter.
-#if defined __GNUC__
-            uint32_t low;
-            uint32_t high;
-            __asm__ volatile ("rdtsc" : "=a" (low), "=d" (high));
-            uint64_t current_time = (uint64_t) high << 32 | low;
-#elif defined _MSC_VER
-            uint64_t current_time = __rdtsc ();
-#else
-#error
-#endif
-
-            //  Check whether TSC haven't jumped backwards (in case of migration
-            //  between CPU cores) and whether certain time have elapsed since
-            //  last command processing. If it didn't do nothing.
-            if (current_time >= last_processing_time &&
-                  current_time - last_processing_time <= max_command_delay)
-                return !terminated;
-            last_processing_time = current_time;
-        }
-#endif
-
-        //  Check whether there are any commands pending for this thread.
-        received = signaler.recv (&cmd, false);
-    }
-
-    //  Process all the commands available at the moment.
-    while (received) {
-        cmd.destination->process_command (cmd);
-        received = signaler.recv (&cmd, false);
-    }
-
-    return !terminated;
-}
-
-zmq::socket_base_t *zmq::app_thread_t::create_socket (int type_)
-{
-    socket_base_t *s = NULL;
-    switch (type_) {
-    case ZMQ_PAIR:
-        s = new (std::nothrow) pair_t (this);
-        break;
-    case ZMQ_PUB:
-        s = new (std::nothrow) pub_t (this);
-        break;
-    case ZMQ_SUB:
-        s = new (std::nothrow) sub_t (this);
-        break;
-    case ZMQ_REQ:
-        s = new (std::nothrow) req_t (this);
-        break;
-    case ZMQ_REP:
-        s = new (std::nothrow) rep_t (this);
-        break;
-    case ZMQ_XREQ:
-        s = new (std::nothrow) xreq_t (this);
-        break;
-    case ZMQ_XREP:
-        s = new (std::nothrow) xrep_t (this);
-        break;       
-    case ZMQ_PULL:
-        s = new (std::nothrow) pull_t (this);
-        break;
-    case ZMQ_PUSH:
-        s = new (std::nothrow) push_t (this);
-        break;
-    default:
-        if (sockets.empty ())
-            get_ctx ()->no_sockets (this);
-        errno = EINVAL;
-        return NULL;
-    }
-    zmq_assert (s);
-
-    sockets.push_back (s);
-
-    return s;
-}
-
-void zmq::app_thread_t::remove_socket (socket_base_t *socket_)
-{
-    sockets.erase (socket_);
-    if (sockets.empty ())
-        get_ctx ()->no_sockets (this);
-}
-
-void zmq::app_thread_t::process_stop ()
-{
-    terminated = true;
-}
-
-bool zmq::app_thread_t::is_terminated ()
-{
-    return terminated;
-}
-
diff --git a/src/app_thread.hpp b/src/app_thread.hpp
deleted file mode 100644
index f0deaab..0000000
--- a/src/app_thread.hpp
+++ /dev/null
@@ -1,88 +0,0 @@
-/*
-    Copyright (c) 2007-2010 iMatix Corporation
-
-    This file is part of 0MQ.
-
-    0MQ is free software; you can redistribute it and/or modify it under
-    the terms of the Lesser GNU General Public License as published by
-    the Free Software Foundation; either version 3 of the License, or
-    (at your option) any later version.
-
-    0MQ is distributed in the hope that it will be useful,
-    but WITHOUT ANY WARRANTY; without even the implied warranty of
-    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    Lesser GNU General Public License for more details.
-
-    You should have received a copy of the Lesser GNU General Public License
-    along with this program.  If not, see <http://www.gnu.org/licenses/>.
-*/
-
-#ifndef __ZMQ_APP_THREAD_HPP_INCLUDED__
-#define __ZMQ_APP_THREAD_HPP_INCLUDED__
-
-#include <vector>
-
-#include "stdint.hpp"
-#include "object.hpp"
-#include "yarray.hpp"
-#include "signaler.hpp"
-
-namespace zmq
-{
-
-    class app_thread_t : public object_t
-    {
-    public:
-
-        app_thread_t (class ctx_t *ctx_, uint32_t thread_slot_);
-
-        ~app_thread_t ();
-
-        //  Interrupt blocking call if the app thread is stuck in one.
-        //  This function is is called from a different thread!
-        void stop ();
-
-        //  Returns signaler associated with this application thread.
-        signaler_t *get_signaler ();
-
-        //  Processes commands sent to this thread (if any). If 'block' is
-        //  set to true, returns only after at least one command was processed.
-        //  If throttle argument is true, commands are processed at most once
-        //  in a predefined time period. The function returns false is the
-        //  associated context was terminated, true otherwise.
-        bool process_commands (bool block_, bool throttle_);
-
-        //  Create a socket of a specified type.
-        class socket_base_t *create_socket (int type_);
-
-        //  Unregister the socket from the app_thread (called by socket itself).
-        void remove_socket (class socket_base_t *socket_);
-
-        //  Returns true is the associated context was already terminated.
-        bool is_terminated ();
-
-    private:
-
-        //  Command handlers.
-        void process_stop ();
-
-        //  All the sockets created from this application thread.
-        typedef yarray_t <socket_base_t> sockets_t;
-        sockets_t sockets;
-
-        //  App thread's signaler object.
-        signaler_t signaler;
-
-        //  Timestamp of when commands were processed the last time.
-        uint64_t last_processing_time;
-
-        //  If true, 'stop' command was already received.
-        bool terminated;
-
-        app_thread_t (const app_thread_t&);
-        void operator = (const app_thread_t&);
-    };
-
-}
-
-#endif
diff --git a/src/yarray.hpp b/src/array.hpp
index 8c79b99..b9f7f78 100644
--- a/src/yarray.hpp
+++ b/src/array.hpp
@@ -1,24 +1,25 @@
 /*
-    Copyright (c) 2007-2010 iMatix Corporation
+    Copyright (c) 2007-2011 iMatix Corporation
+    Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
 
     This file is part of 0MQ.
 
     0MQ is free software; you can redistribute it and/or modify it under
-    the terms of the Lesser GNU General Public License as published by
+    the terms of the GNU Lesser General Public License as published by
     the Free Software Foundation; either version 3 of the License, or
     (at your option) any later version.
 
     0MQ is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    Lesser GNU General Public License for more details.
+    GNU Lesser General Public License for more details.
 
-    You should have received a copy of the Lesser GNU General Public License
+    You should have received a copy of the GNU Lesser General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
-#ifndef __ZMQ_YARRAY_INCLUDED__
-#define __ZMQ_YARRAY_INCLUDED__
+#ifndef __ZMQ_ARRAY_INCLUDED__
+#define __ZMQ_ARRAY_INCLUDED__
 
 #include <vector>
 #include <algorithm>
@@ -26,21 +27,57 @@
 namespace zmq
 {
 
+    //  Base class for objects stored in the array. Note that each object can
+    //  be stored in at most one array.
+
+    class array_item_t
+    {
+    public:
+
+        inline array_item_t () :
+            array_index (-1)
+        {
+        }
+
+        //  The destructor doesn't have to be virtual. It is mad virtual
+        //  just to keep ICC and code checking tools from complaining.
+        inline virtual ~array_item_t ()
+        {
+        }
+
+        inline void set_array_index (int index_)
+        {
+            array_index = index_;
+        }
+
+        inline int get_array_index ()
+        {
+            return array_index;
+        }
+
+    private:
+
+        int array_index;
+
+        array_item_t (const array_item_t&);
+        const array_item_t &operator = (const array_item_t&);
+    };
+
     //  Fast array implementation with O(1) access to item, insertion and
-    //  removal. Yarray stores pointers rather than objects. The objects have
-    //  to be derived from yarray_item_t class.
+    //  removal. Array stores pointers rather than objects. The objects have
+    //  to be derived from array_item_t class.
 
-    template <typename T> class yarray_t
+    template <typename T> class array_t
     {
     public:
 
         typedef typename std::vector <T*>::size_type size_type;
 
-        inline yarray_t ()
+        inline array_t ()
         {
         }
 
-        inline ~yarray_t ()
+        inline ~array_t ()
         {
         }
 
@@ -62,17 +99,17 @@ namespace zmq
         inline void push_back (T *item_)
         {
             if (item_)
-                item_->set_yarray_index (items.size ());
+                item_->set_array_index (items.size ());
             items.push_back (item_);
         }
 
         inline void erase (T *item_) {
-            erase (item_->get_yarray_index ());
+            erase (item_->get_array_index ());
         }
 
         inline void erase (size_type index_) {
             if (items.back ())
-                items.back ()->set_yarray_index (index_);
+                items.back ()->set_array_index (index_);
             items [index_] = items.back ();
             items.pop_back ();
         }
@@ -80,9 +117,9 @@ namespace zmq
         inline void swap (size_type index1_, size_type index2_)
         {
             if (items [index1_])
-                items [index1_]->set_yarray_index (index2_);
+                items [index1_]->set_array_index (index2_);
             if (items [index2_])
-                items [index2_]->set_yarray_index (index1_);
+                items [index2_]->set_array_index (index1_);
             std::swap (items [index1_], items [index2_]);
         }
 
@@ -93,7 +130,7 @@ namespace zmq
 
         inline size_type index (T *item_)
         {
-            return (size_type) item_->get_yarray_index ();
+            return (size_type) item_->get_array_index ();
         }
 
     private:
@@ -101,8 +138,8 @@ namespace zmq
         typedef std::vector <T*> items_t;
         items_t items;
 
-        yarray_t (const yarray_t&);
-        void operator = (const yarray_t&);
+        array_t (const array_t&);
+        const array_t &operator = (const array_t&);
     };
 
 }
diff --git a/src/atomic_counter.hpp b/src/atomic_counter.hpp
index b446627..d7116d8 100644
--- a/src/atomic_counter.hpp
+++ b/src/atomic_counter.hpp
@@ -1,19 +1,20 @@
 /*
-    Copyright (c) 2007-2010 iMatix Corporation
+    Copyright (c) 2007-2011 iMatix Corporation
+    Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
 
     This file is part of 0MQ.
 
     0MQ is free software; you can redistribute it and/or modify it under
-    the terms of the Lesser GNU General Public License as published by
+    the terms of the GNU Lesser General Public License as published by
     the Free Software Foundation; either version 3 of the License, or
     (at your option) any later version.
 
     0MQ is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    Lesser GNU General Public License for more details.
+    GNU Lesser General Public License for more details.
 
-    You should have received a copy of the Lesser GNU General Public License
+    You should have received a copy of the GNU Lesser General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
@@ -140,7 +141,7 @@ namespace zmq
 #endif
 
         atomic_counter_t (const atomic_counter_t&);
-        void operator = (const atomic_counter_t&);
+        const atomic_counter_t& operator = (const atomic_counter_t&);
     };
 
 }
diff --git a/src/atomic_ptr.hpp b/src/atomic_ptr.hpp
index 54db64f..c106cd5 100644
--- a/src/atomic_ptr.hpp
+++ b/src/atomic_ptr.hpp
@@ -1,19 +1,20 @@
 /*
-    Copyright (c) 2007-2010 iMatix Corporation
+    Copyright (c) 2007-2011 iMatix Corporation
+    Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
 
     This file is part of 0MQ.
 
     0MQ is free software; you can redistribute it and/or modify it under
-    the terms of the Lesser GNU General Public License as published by
+    the terms of the GNU Lesser General Public License as published by
     the Free Software Foundation; either version 3 of the License, or
     (at your option) any later version.
 
     0MQ is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    Lesser GNU General Public License for more details.
+    GNU Lesser General Public License for more details.
 
-    You should have received a copy of the Lesser GNU General Public License
+    You should have received a copy of the GNU Lesser General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
@@ -135,7 +136,7 @@ namespace zmq
 #endif
 
         atomic_ptr_t (const atomic_ptr_t&);
-        void operator = (const atomic_ptr_t&);
+        const atomic_ptr_t &operator = (const atomic_ptr_t&);
     };
 
 }
diff --git a/src/blob.hpp b/src/blob.hpp
index a4fa8cd..3c54ac3 100644
--- a/src/blob.hpp
+++ b/src/blob.hpp
@@ -1,19 +1,20 @@
 /*
-    Copyright (c) 2007-2010 iMatix Corporation
+    Copyright (c) 2007-2011 iMatix Corporation
+    Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
 
     This file is part of 0MQ.
 
     0MQ is free software; you can redistribute it and/or modify it under
-    the terms of the Lesser GNU General Public License as published by
+    the terms of the GNU Lesser General Public License as published by
     the Free Software Foundation; either version 3 of the License, or
     (at your option) any later version.
 
     0MQ is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    Lesser GNU General Public License for more details.
+    GNU Lesser General Public License for more details.
 
-    You should have received a copy of the Lesser GNU General Public License
+    You should have received a copy of the GNU Lesser General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
diff --git a/src/clock.cpp b/src/clock.cpp
new file mode 100644
index 0000000..f98a2f4
--- /dev/null
+++ b/src/clock.cpp
@@ -0,0 +1,118 @@
+/*
+    Copyright (c) 2007-2011 iMatix Corporation
+    Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
+
+    This file is part of 0MQ.
+
+    0MQ is free software; you can redistribute it and/or modify it under
+    the terms of the GNU Lesser General Public License as published by
+    the Free Software Foundation; either version 3 of the License, or
+    (at your option) any later version.
+
+    0MQ is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU Lesser General Public License for more details.
+
+    You should have received a copy of the GNU Lesser General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "clock.hpp"
+#include "platform.hpp"
+#include "likely.hpp"
+#include "config.hpp"
+#include "err.hpp"
+
+#include <stddef.h>
+
+#if defined _MSC_VER
+#include <intrin.h>
+#endif
+
+#if !defined ZMQ_HAVE_WINDOWS
+#include <sys/time.h>
+#endif
+
+zmq::clock_t::clock_t () :
+    last_tsc (rdtsc ()),
+    last_time (now_us () / 1000)
+{
+}
+
+zmq::clock_t::~clock_t ()
+{
+}
+
+uint64_t zmq::clock_t::now_us ()
+{
+#if defined ZMQ_HAVE_WINDOWS
+
+    //  Get the high resolution counter's accuracy.
+    LARGE_INTEGER ticksPerSecond;
+    QueryPerformanceFrequency (&ticksPerSecond);
+
+    //  What time is it?
+    LARGE_INTEGER tick;
+    QueryPerformanceCounter (&tick);
+
+    //  Convert the tick number into the number of seconds
+    //  since the system was started.
+    double ticks_div = (double) (ticksPerSecond.QuadPart / 1000000);     
+    return (uint64_t) (tick.QuadPart / ticks_div);
+
+#else
+
+    //  Use POSIX gettimeofday function to get precise time.
+    struct timeval tv;
+    int rc = gettimeofday (&tv, NULL);
+    errno_assert (rc == 0);
+    return (tv.tv_sec * (uint64_t) 1000000 + tv.tv_usec);
+
+#endif
+}
+
+uint64_t zmq::clock_t::now_ms ()
+{
+    uint64_t tsc = rdtsc ();
+
+    //  If TSC is not supported, get precise time and chop off the microseconds.
+    if (!tsc)
+        return now_us () / 1000;
+
+    //  If TSC haven't jumped back (in case of migration to a different
+    //  CPU core) and if not too much time elapsed since last measurement,
+    //  we can return cached time value.
+    if (likely (tsc - last_tsc <= (clock_precision / 2) && tsc >= last_tsc))
+        return last_time;
+
+    last_tsc = tsc;
+    last_time = now_us () / 1000;
+    return last_time;
+}
+
+uint64_t zmq::clock_t::rdtsc ()
+{
+#if (defined _MSC_VER && (defined _M_IX86 || defined _M_X64))
+    return __rdtsc ();
+#elif (defined __GNUC__ && (defined __i386__ || defined __x86_64__))
+    uint32_t low, high;
+    __asm__ volatile ("rdtsc" : "=a" (low), "=d" (high));
+    return (uint64_t) high << 32 | low;
+#elif (defined __SUNPRO_CC && (__SUNPRO_CC >= 0x5100) && (defined __i386 || \
+    defined __amd64 || defined __x86_64))
+    union {
+        uint64_t u64val;
+        uint32_t u32val [2];
+    } tsc;
+    asm("rdtsc" : "=a" (tsc.u32val [0]), "=d" (tsc.u32val [1]));
+    return tsc.u64val;
+#elif defined(__s390__)
+    uint64_t tsc;
+    asm("\tstck\t%0\n" : "=Q" (tsc) : : "cc");
+    tsc >>= 12;		/* convert to microseconds just to be consistent */
+    return(tsc);
+#else
+    return 0;
+#endif
+}
diff --git a/src/clock.hpp b/src/clock.hpp
new file mode 100644
index 0000000..1b34989
--- /dev/null
+++ b/src/clock.hpp
@@ -0,0 +1,60 @@
+/*
+    Copyright (c) 2007-2011 iMatix Corporation
+    Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
+
+    This file is part of 0MQ.
+
+    0MQ is free software; you can redistribute it and/or modify it under
+    the terms of the GNU Lesser General Public License as published by
+    the Free Software Foundation; either version 3 of the License, or
+    (at your option) any later version.
+
+    0MQ is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU Lesser General Public License for more details.
+
+    You should have received a copy of the GNU Lesser General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef __ZMQ_CLOCK_HPP_INCLUDED__
+#define __ZMQ_CLOCK_HPP_INCLUDED__
+
+#include "stdint.hpp"
+
+namespace zmq
+{
+
+    class clock_t
+    {
+    public:
+
+        clock_t ();
+        ~clock_t ();
+
+        //  CPU's timestamp counter. Returns 0 if it's not available.
+        static uint64_t rdtsc ();
+
+        //  High precision timestamp.
+        static uint64_t now_us ();
+
+        //  Low precision timestamp. In tight loops generating it can be
+        //  10 to 100 times faster than the high precision timestamp.
+        uint64_t now_ms ();
+
+    private:
+
+        //  TSC timestamp of when last time measurement was made.
+        uint64_t last_tsc;
+
+        //  Physical time corresponding to the TSC above (in milliseconds).
+        uint64_t last_time;
+
+        clock_t (const clock_t&);
+        const clock_t &operator = (const clock_t&);
+    };
+
+}
+
+#endif
diff --git a/src/command.cpp b/src/command.cpp
index 8bf7ea2..e3f3d59 100644
--- a/src/command.cpp
+++ b/src/command.cpp
@@ -1,19 +1,20 @@
 /*
-    Copyright (c) 2007-2010 iMatix Corporation
+    Copyright (c) 2007-2011 iMatix Corporation
+    Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
 
     This file is part of 0MQ.
 
     0MQ is free software; you can redistribute it and/or modify it under
-    the terms of the Lesser GNU General Public License as published by
+    the terms of the GNU Lesser General Public License as published by
     the Free Software Foundation; either version 3 of the License, or
     (at your option) any later version.
 
     0MQ is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    Lesser GNU General Public License for more details.
+    GNU Lesser General Public License for more details.
 
-    You should have received a copy of the Lesser GNU General Public License
+    You should have received a copy of the GNU Lesser General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
diff --git a/src/command.hpp b/src/command.hpp
index 3d00cd7..35aed0f 100644
--- a/src/command.hpp
+++ b/src/command.hpp
@@ -1,19 +1,20 @@
 /*
-    Copyright (c) 2007-2010 iMatix Corporation
+    Copyright (c) 2007-2011 iMatix Corporation
+    Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
 
     This file is part of 0MQ.
 
     0MQ is free software; you can redistribute it and/or modify it under
-    the terms of the Lesser GNU General Public License as published by
+    the terms of the GNU Lesser General Public License as published by
     the Free Software Foundation; either version 3 of the License, or
     (at your option) any later version.
 
     0MQ is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    Lesser GNU General Public License for more details.
+    GNU Lesser General Public License for more details.
 
-    You should have received a copy of the Lesser GNU General Public License
+    You should have received a copy of the GNU Lesser General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
@@ -39,13 +40,16 @@ namespace zmq
             own,
             attach,
             bind,
-            revive,
-            reader_info,
+            activate_reader,
+            activate_writer,
             pipe_term,
             pipe_term_ack,
             term_req,
             term,
-            term_ack
+            term_ack,
+            reap,
+            reaped,
+            done
         } type;
 
         union {
@@ -61,10 +65,11 @@ namespace zmq
 
             //  Sent to socket to let it know about the newly created object.
             struct {
-                class owned_t *object;
+                class own_t *object;
             } own;
 
-            //  Attach the engine to the session.
+            //  Attach the engine to the session. If engine is NULL, it informs
+            //  session that the connection have failed.
             struct {
                 struct i_engine *engine;
                 unsigned char peer_identity_size;
@@ -83,14 +88,13 @@ namespace zmq
             //  Sent by pipe writer to inform dormant pipe reader that there
             //  are messages in the pipe.
             struct {
-            } revive;
+            } activate_reader;
 
-            //  Sent by pipe reader to inform pipe writer
-            //  about how many messages it has read so far.
-            //  Used to implement the flow control.
+            //  Sent by pipe reader to inform pipe writer about how many
+            //  messages it has read so far.
             struct {
                 uint64_t msgs_read;
-            } reader_info;
+            } activate_writer;
 
             //  Sent by pipe reader to pipe writer to ask it to terminate
             //  its end of the pipe.
@@ -104,11 +108,12 @@ namespace zmq
             //  Sent by I/O object ot the socket to request the shutdown of
             //  the I/O object.
             struct {
-                class owned_t *object;
+                class own_t *object;
             } term_req;
 
             //  Sent by socket to I/O object to start its shutdown.
             struct {
+                int linger;
             } term;
 
             //  Sent by I/O object to the socket to acknowledge it has
@@ -116,6 +121,21 @@ namespace zmq
             struct {
             } term_ack;
 
+            //  Transfers the ownership of the closed socket
+            //  to the reaper thread.
+            struct {
+                class socket_base_t *socket;
+            } reap;
+
+            //  Closed socket notifies the reaper that it's already deallocated.
+            struct {
+            } reaped;
+
+            //  Sent by reaper thread to the term thread when all the sockets
+            //  are successfully deallocated.
+            struct {
+            } done;
+
         } args;
     };
 
diff --git a/src/config.hpp b/src/config.hpp
index 2c0ac2d..f144512 100644
--- a/src/config.hpp
+++ b/src/config.hpp
@@ -1,19 +1,20 @@
 /*
-    Copyright (c) 2007-2010 iMatix Corporation
+    Copyright (c) 2007-2011 iMatix Corporation
+    Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
 
     This file is part of 0MQ.
 
     0MQ is free software; you can redistribute it and/or modify it under
-    the terms of the Lesser GNU General Public License as published by
+    the terms of the GNU Lesser General Public License as published by
     the Free Software Foundation; either version 3 of the License, or
     (at your option) any later version.
 
     0MQ is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    Lesser GNU General Public License for more details.
+    GNU Lesser General Public License for more details.
 
-    You should have received a copy of the Lesser GNU General Public License
+    You should have received a copy of the GNU Lesser General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
@@ -27,19 +28,14 @@ namespace zmq
 
     enum 
     {
-        //  Maximal number of OS threads that can own 0MQ sockets
-        //  at the same time.
-        max_app_threads = 512,
+        //  Maximum number of sockets that can be opened at the same time.
+        max_sockets = 512,
 
         //  Number of new messages in message pipe needed to trigger new memory
         //  allocation. Setting this parameter to 256 decreases the impact of
         //  memory allocation by approximately 99.6%
         message_pipe_granularity = 256,
 
-        //  Number of signals that can be read by the signaler
-        //  using a single system call.
-        signal_buffer_size = 8,
-
         //  Determines how often does socket poll for new commands when it
         //  still has unprocessed messages to handle. Thus, if it is set to 100,
         //  socket will process 100 inbound messages before doing the poll.
@@ -63,19 +59,25 @@ namespace zmq
         //  Maximal delta between high and low watermark.
         max_wm_delta = 1024,
 
+        //  Swap inteligently batches data for writing to disk. The size of
+        //  the batch in bytes is specified by this option.
+        swap_block_size = 8192,
+
         //  Maximum number of events the I/O thread can process in one go.
         max_io_events = 256,
 
-        //  Maximal wait time for a timer (milliseconds).
-        max_timer_period = 100,
-
         //  Maximal delay to process command in API thread (in CPU ticks).
         //  3,000,000 ticks equals to 1 - 2 milliseconds on current CPUs.
+        //  Note that delay is only applied when there is continuous stream of
+        //  messages to process. If not so, commands are processed immediately.
         max_command_delay = 3000000,
 
-        //  Maximal number of non-accepted connections that can be held by
-        //  TCP listener object.
-        tcp_connection_backlog = 10,
+        //  Low-precision clock precision in CPU ticks. 1ms. Value of 1000000
+        //  should be OK for CPU frequencies above 1GHz. If should work
+        //  reasonably well for CPU frequencies above 500MHz. For lower CPU
+        //  frequencies you may consider lowering this value to get best
+        //  possible latencies.
+        clock_precision = 1000000,
 
         //  Maximum transport data unit size for PGM (TPDU).
         pgm_max_tpdu = 1500
diff --git a/src/connect_session.cpp b/src/connect_session.cpp
new file mode 100644
index 0000000..0df9854
--- /dev/null
+++ b/src/connect_session.cpp
@@ -0,0 +1,119 @@
+/*
+    Copyright (c) 2007-2011 iMatix Corporation
+    Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
+
+    This file is part of 0MQ.
+
+    0MQ is free software; you can redistribute it and/or modify it under
+    the terms of the GNU Lesser General Public License as published by
+    the Free Software Foundation; either version 3 of the License, or
+    (at your option) any later version.
+
+    0MQ is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU Lesser General Public License for more details.
+
+    You should have received a copy of the GNU Lesser General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "connect_session.hpp"
+#include "zmq_connecter.hpp"
+#include "pgm_sender.hpp"
+#include "pgm_receiver.hpp"
+
+zmq::connect_session_t::connect_session_t (class io_thread_t *io_thread_,
+      class socket_base_t *socket_, const options_t &options_,
+      const char *protocol_, const char *address_) :
+    session_t (io_thread_, socket_, options_),
+    protocol (protocol_),
+    address (address_)
+{
+}
+
+zmq::connect_session_t::~connect_session_t ()
+{
+}
+
+void zmq::connect_session_t::process_plug ()
+{
+    //  Start connection process immediately.
+    start_connecting (false);
+}
+
+void zmq::connect_session_t::start_connecting (bool wait_)
+{
+    //  Choose I/O thread to run connecter in. Given that we are already
+    //  running in an I/O thread, there must be at least one available.
+    io_thread_t *io_thread = choose_io_thread (options.affinity);
+    zmq_assert (io_thread);
+
+    //  Create the connecter object.
+
+    //  Both TCP and IPC transports are using the same infrastructure.
+    if (protocol == "tcp" || protocol == "ipc") {
+
+        zmq_connecter_t *connecter = new (std::nothrow) zmq_connecter_t (
+            io_thread, this, options, protocol.c_str (), address.c_str (),
+            wait_);
+        alloc_assert (connecter);
+        launch_child (connecter);
+        return;
+    }
+
+#if defined ZMQ_HAVE_OPENPGM
+
+    //  Both PGM and EPGM transports are using the same infrastructure.
+    if (protocol == "pgm" || protocol == "epgm") {
+
+        //  For EPGM transport with UDP encapsulation of PGM is used.
+        bool udp_encapsulation = (protocol == "epgm");
+
+        //  At this point we'll create message pipes to the session straight
+        //  away. There's no point in delaying it as no concept of 'connect'
+        //  exists with PGM anyway.
+        if (options.type == ZMQ_PUB || options.type == ZMQ_XPUB) {
+
+            //  PGM sender.
+            pgm_sender_t *pgm_sender =  new (std::nothrow) pgm_sender_t (
+                io_thread, options);
+            alloc_assert (pgm_sender);
+
+            int rc = pgm_sender->init (udp_encapsulation, address.c_str ());
+            zmq_assert (rc == 0);
+
+            send_attach (this, pgm_sender, blob_t ());
+        }
+        else if (options.type == ZMQ_SUB || options.type == ZMQ_XSUB) {
+
+            //  PGM receiver.
+            pgm_receiver_t *pgm_receiver =  new (std::nothrow) pgm_receiver_t (
+                io_thread, options);
+            alloc_assert (pgm_receiver);
+
+            int rc = pgm_receiver->init (udp_encapsulation, address.c_str ());
+            zmq_assert (rc == 0);
+
+            send_attach (this, pgm_receiver, blob_t ());
+        }
+        else
+            zmq_assert (false);
+
+        return;
+    }
+#endif
+
+    zmq_assert (false);
+}
+
+void zmq::connect_session_t::attached (const blob_t &peer_identity_)
+{
+}
+
+void zmq::connect_session_t::detached ()
+{
+    //  Reconnect.
+    start_connecting (true);
+}
+
diff --git a/src/connect_session.hpp b/src/connect_session.hpp
new file mode 100644
index 0000000..327ad2d
--- /dev/null
+++ b/src/connect_session.hpp
@@ -0,0 +1,65 @@
+/*
+    Copyright (c) 2007-2011 iMatix Corporation
+    Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
+
+    This file is part of 0MQ.
+
+    0MQ is free software; you can redistribute it and/or modify it under
+    the terms of the GNU Lesser General Public License as published by
+    the Free Software Foundation; either version 3 of the License, or
+    (at your option) any later version.
+
+    0MQ is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU Lesser General Public License for more details.
+
+    You should have received a copy of the GNU Lesser General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef __ZMQ_CONNECT_SESSION_HPP_INCLUDED__
+#define __ZMQ_CONNECT_SESSION_HPP_INCLUDED__
+
+#include <string>
+
+#include "session.hpp"
+
+namespace zmq
+{
+
+    //  Connect session contains an address to connect to. On disconnect it
+    //  attempts to reconnect.
+
+    class connect_session_t : public session_t
+    {
+    public:
+
+        connect_session_t (class io_thread_t *io_thread_,
+            class socket_base_t *socket_, const options_t &options_,
+            const char *protocol_, const char *address_);
+        ~connect_session_t ();
+
+    private:
+
+        //  Handlers for events from session base class.
+        void attached (const blob_t &peer_identity_);
+        void detached ();
+
+        //  Start the connection process.
+        void start_connecting (bool wait_);
+
+        //  Command handlers.
+        void process_plug ();
+
+        //  Address to connect to.
+        std::string protocol;
+        std::string address;
+
+        connect_session_t (const connect_session_t&);
+        const connect_session_t &operator = (const connect_session_t&);
+    };
+
+}
+
+#endif
diff --git a/src/ctx.cpp b/src/ctx.cpp
index 397f692..9cbb9de 100644
--- a/src/ctx.cpp
+++ b/src/ctx.cpp
@@ -1,93 +1,88 @@
 /*
-    Copyright (c) 2007-2010 iMatix Corporation
+    Copyright (c) 2007-2011 iMatix Corporation
+    Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
 
     This file is part of 0MQ.
 
     0MQ is free software; you can redistribute it and/or modify it under
-    the terms of the Lesser GNU General Public License as published by
+    the terms of the GNU Lesser General Public License as published by
     the Free Software Foundation; either version 3 of the License, or
     (at your option) any later version.
 
     0MQ is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    Lesser GNU General Public License for more details.
+    GNU Lesser General Public License for more details.
 
-    You should have received a copy of the Lesser GNU General Public License
+    You should have received a copy of the GNU Lesser General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
 #include <new>
 #include <string.h>
 
-#include "../include/zmq.h"
-
 #include "ctx.hpp"
 #include "socket_base.hpp"
-#include "app_thread.hpp"
 #include "io_thread.hpp"
 #include "platform.hpp"
+#include "reaper.hpp"
 #include "err.hpp"
 #include "pipe.hpp"
 
 #if defined ZMQ_HAVE_WINDOWS
 #include "windows.h"
+#else
+#include "unistd.h"
 #endif
 
 zmq::ctx_t::ctx_t (uint32_t io_threads_) :
-    sockets (0),
-    terminated (false)
+    terminating (false)
 {
-#ifdef ZMQ_HAVE_WINDOWS
-    //  Intialise Windows sockets. Note that WSAStartup can be called multiple
-    //  times given that WSACleanup will be called for each WSAStartup.
-    WORD version_requested = MAKEWORD (2, 2);
-    WSADATA wsa_data;
-    int rc = WSAStartup (version_requested, &wsa_data);
-    zmq_assert (rc == 0);
-    zmq_assert (LOBYTE (wsa_data.wVersion) == 2 &&
-        HIBYTE (wsa_data.wVersion) == 2);
-#endif
+    int rc;
 
-    //  Initialise the array of signalers.
-    signalers_count = max_app_threads + io_threads_;
-    signalers = (signaler_t**) malloc (sizeof (signaler_t*) * signalers_count);
-    zmq_assert (signalers);
-    memset (signalers, 0, sizeof (signaler_t*) * signalers_count);
+    //  Initialise the array of mailboxes. Additional three slots are for
+    //  internal log socket and the zmq_term thread the reaper thread.
+    slot_count = max_sockets + io_threads_ + 3;
+    slots = (mailbox_t**) malloc (sizeof (mailbox_t*) * slot_count);
+    alloc_assert (slots);
+
+    //  Initialise the infrastructure for zmq_term thread.
+    slots [term_tid] = &term_mailbox;
+
+    //  Create the reaper thread.
+    reaper = new (std::nothrow) reaper_t (this, reaper_tid);
+    alloc_assert (reaper);
+    slots [reaper_tid] = reaper->get_mailbox ();
+    reaper->start ();
 
     //  Create I/O thread objects and launch them.
-    for (uint32_t i = 0; i != io_threads_; i++) {
+    for (uint32_t i = 2; i != io_threads_ + 2; i++) {
         io_thread_t *io_thread = new (std::nothrow) io_thread_t (this, i);
-        zmq_assert (io_thread);
+        alloc_assert (io_thread);
         io_threads.push_back (io_thread);
-        signalers [i] = io_thread->get_signaler ();
+        slots [i] = io_thread->get_mailbox ();
         io_thread->start ();
     }
-}
 
-int zmq::ctx_t::term ()
-{
-    //  First send stop command to application threads so that any
-    //  blocking calls are interrupted.
-    for (app_threads_t::size_type i = 0; i != app_threads.size (); i++)
-        app_threads [i].app_thread->stop ();
-
-    //  Then mark context as terminated.
-    term_sync.lock ();
-    zmq_assert (!terminated);
-    terminated = true;
-    bool destroy = (sockets == 0);
-    term_sync.unlock ();
-    
-    //  If there are no sockets open, destroy the context immediately.
-    if (destroy)
-        delete this;
+    //  In the unused part of the slot array, create a list of empty slots.
+    for (int32_t i = (int32_t) slot_count - 1;
+          i >= (int32_t) io_threads_ + 2; i--) {
+        empty_slots.push_back (i);
+        slots [i] = NULL;
+    }
 
-    return 0;
+    //  Create the logging infrastructure.
+    log_socket = create_socket (ZMQ_PUB);
+    zmq_assert (log_socket);
+    rc = log_socket->bind ("sys://log");
+    zmq_assert (rc == 0);
 }
 
 zmq::ctx_t::~ctx_t ()
 {
+    //  Check that there are no remaining sockets.
+    zmq_assert (sockets.empty ());
+
     //  Ask I/O threads to terminate. If stop signal wasn't sent to I/O
     //  thread subsequent invocation of destructor would hang-up.
     for (io_threads_t::size_type i = 0; i != io_threads.size (); i++)
@@ -97,136 +92,134 @@ zmq::ctx_t::~ctx_t ()
     for (io_threads_t::size_type i = 0; i != io_threads.size (); i++)
         delete io_threads [i];
 
-    //  Close all application theads, sockets, io_objects etc.
-    for (app_threads_t::size_type i = 0; i != app_threads.size (); i++)
-        delete app_threads [i].app_thread;
-
-    //  Deallocate all the orphaned pipes.
-    while (!pipes.empty ())
-        delete *pipes.begin ();
-
-    //  Deallocate the array of pointers to signalers. No special work is
-    //  needed as signalers themselves were deallocated with their
-    //  corresponding (app_/io_) thread objects.
-    free (signalers);
-    
-#ifdef ZMQ_HAVE_WINDOWS
-    //  On Windows, uninitialise socket layer.
-    int rc = WSACleanup ();
-    wsa_assert (rc != SOCKET_ERROR);
-#endif
+    //  Deallocate the reaper thread object.
+    delete reaper;
+
+    //  Deallocate the array of mailboxes. No special work is
+    //  needed as mailboxes themselves were deallocated with their
+    //  corresponding io_thread/socket objects.
+    free (slots);
 }
 
-zmq::socket_base_t *zmq::ctx_t::create_socket (int type_)
+int zmq::ctx_t::terminate ()
 {
-    app_threads_sync.lock ();
-
-    //  Find whether the calling thread has app_thread_t object associated
-    //  already. At the same time find an unused app_thread_t so that it can
-    //  be used if there's no associated object for the calling thread.
-    //  Check whether thread ID is already assigned. If so, return it.
-    app_threads_t::size_type unused = app_threads.size ();
-    app_threads_t::size_type current;
-    for (current = 0; current != app_threads.size (); current++) {
-        if (app_threads [current].associated &&
-              thread_t::equal (thread_t::id (), app_threads [current].tid))
-            break;
-        if (!app_threads [current].associated)
-            unused = current;
+    //  Check whether termination was already underway, but interrupted and now
+    //  restarted.
+    slot_sync.lock ();
+    bool restarted = terminating;
+    slot_sync.unlock ();
+
+    //  First attempt to terminate the context.
+    if (!restarted) {
+
+        //  Close the logging infrastructure.
+        log_sync.lock ();
+        int rc = log_socket->close ();
+        zmq_assert (rc == 0);
+        log_socket = NULL;
+        log_sync.unlock ();
+
+        //  First send stop command to sockets so that any blocking calls can be
+        //  interrupted. If there are no sockets we can ask reaper thread to stop.
+        slot_sync.lock ();
+        terminating = true;
+        for (sockets_t::size_type i = 0; i != sockets.size (); i++)
+            sockets [i]->stop ();
+        if (sockets.empty ())
+            reaper->stop ();
+        slot_sync.unlock ();
     }
 
-    //  If no app_thread_t is associated with the calling thread,
-    //  associate it with one of the unused app_thread_t objects.
-    if (current == app_threads.size ()) {
+    //  Wait till reaper thread closes all the sockets.
+    command_t cmd;
+    int rc = term_mailbox.recv (&cmd, true);
+    if (rc == -1 && errno == EINTR)
+        return -1;
+    zmq_assert (rc == 0);
+    zmq_assert (cmd.type == command_t::done);
+    slot_sync.lock ();
+    zmq_assert (sockets.empty ());
+    slot_sync.unlock ();
 
-        //  If all the existing app_threads are already used, create one more.
-        if (unused == app_threads.size ()) {
+    //  Deallocate the resources.
+    delete this;
 
-            //  If max_app_threads limit was reached, return error.
-            if (app_threads.size () == max_app_threads) {
-                app_threads_sync.unlock ();
-                errno = EMTHREAD;
-                return NULL;
-            }
+    return 0;
+}
 
-            //  Create the new application thread proxy object.
-            app_thread_info_t info;
-            memset (&info, 0, sizeof (info));
-            info.associated = false;
-            info.app_thread = new (std::nothrow) app_thread_t (this,
-                io_threads.size () + app_threads.size ());
-            zmq_assert (info.app_thread);
-            signalers [io_threads.size () + app_threads.size ()] =
-                info.app_thread->get_signaler ();
-            app_threads.push_back (info);
-        }
+zmq::socket_base_t *zmq::ctx_t::create_socket (int type_)
+{
+    slot_sync.lock ();
 
-        //  Incidentally, this works both when there is an unused app_thread
-        //  and when a new one is created.
-        current = unused;
+    //  Once zmq_term() was called, we can't create new sockets.
+    if (terminating) {
+        slot_sync.unlock ();
+        errno = ETERM;
+        return NULL;
+    }
 
-        //  Associate the selected app_thread with the OS thread.
-        app_threads [current].associated = true;
-        app_threads [current].tid = thread_t::id ();
+    //  If max_sockets limit was reached, return error.
+    if (empty_slots.empty ()) {
+        slot_sync.unlock ();
+        errno = EMFILE;
+        return NULL;
     }
 
-    app_thread_t *thread = app_threads [current].app_thread;
-    app_threads_sync.unlock ();
+    //  Choose a slot for the socket.
+    uint32_t slot = empty_slots.back ();
+    empty_slots.pop_back ();
 
-    socket_base_t *s = thread->create_socket (type_);
-    if (!s)
+    //  Create the socket and register its mailbox.
+    socket_base_t *s = socket_base_t::create (type_, this, slot);
+    if (!s) {
+        empty_slots.push_back (slot);
+        slot_sync.unlock ();
         return NULL;
+    }
+    sockets.push_back (s);
+    slots [slot] = s->get_mailbox ();
 
-    term_sync.lock ();
-    sockets++;
-    term_sync.unlock ();
+    slot_sync.unlock ();
 
     return s;
 }
 
-void zmq::ctx_t::destroy_socket ()
+void zmq::ctx_t::destroy_socket (class socket_base_t *socket_)
 {
-    //  If zmq_term was already called and there are no more sockets,
-    //  terminate the whole 0MQ infrastructure.
-    term_sync.lock ();
-    zmq_assert (sockets > 0);
-    sockets--;
-    bool destroy = (sockets == 0 && terminated);
-    term_sync.unlock ();
-
-    if (destroy)
-       delete this;
-}
+    slot_sync.lock ();
 
-void zmq::ctx_t::no_sockets (app_thread_t *thread_)
-{
-    app_threads_sync.lock ();
-    app_threads_t::size_type i;
-    for (i = 0; i != app_threads.size (); i++)
-        if (app_threads [i].app_thread == thread_) {
-            app_threads [i].associated = false;
-            break;
-        }
-    zmq_assert (i != app_threads.size ());
-    app_threads_sync.unlock ();
+    //  Free the associared thread slot.
+    uint32_t tid = socket_->get_tid ();
+    empty_slots.push_back (tid);
+    slots [tid] = NULL;    
+
+    //  Remove the socket from the list of sockets.
+    sockets.erase (socket_);
+
+    //  If zmq_term() was already called and there are no more socket
+    //  we can ask reaper thread to terminate.
+    if (terminating && sockets.empty ())
+        reaper->stop ();
+
+    slot_sync.unlock ();
 }
 
-void zmq::ctx_t::send_command (uint32_t destination_,
-    const command_t &command_)
+zmq::object_t *zmq::ctx_t::get_reaper ()
 {
-    signalers [destination_]->send (command_);
+    return reaper;
 }
 
-bool zmq::ctx_t::recv_command (uint32_t thread_slot_,
-    command_t *command_, bool block_)
+void zmq::ctx_t::send_command (uint32_t tid_, const command_t &command_)
 {
-    return signalers [thread_slot_]->recv (command_, block_);
+    slots [tid_]->send (command_);
 }
 
 zmq::io_thread_t *zmq::ctx_t::choose_io_thread (uint64_t affinity_)
 {
+    if (io_threads.empty ())
+        return NULL;
+
     //  Find the I/O thread with minimum load.
-    zmq_assert (io_threads.size () > 0);
     int min_load = -1;
     io_threads_t::size_type result = 0;
     for (io_threads_t::size_type i = 0; i != io_threads.size (); i++) {
@@ -242,29 +235,12 @@ zmq::io_thread_t *zmq::ctx_t::choose_io_thread (uint64_t affinity_)
     return io_threads [result];
 }
 
-void zmq::ctx_t::register_pipe (class pipe_t *pipe_)
-{
-    pipes_sync.lock ();
-    bool inserted = pipes.insert (pipe_).second;
-    zmq_assert (inserted);
-    pipes_sync.unlock ();
-}
-
-void zmq::ctx_t::unregister_pipe (class pipe_t *pipe_)
-{
-    pipes_sync.lock ();
-    pipes_t::size_type erased = pipes.erase (pipe_);
-    zmq_assert (erased == 1);
-    pipes_sync.unlock ();
-}
-
-int zmq::ctx_t::register_endpoint (const char *addr_,
-    socket_base_t *socket_)
+int zmq::ctx_t::register_endpoint (const char *addr_, endpoint_t &endpoint_)
 {
     endpoints_sync.lock ();
 
-    bool inserted = endpoints.insert (std::make_pair (std::string (addr_),
-        socket_)).second;
+    bool inserted = endpoints.insert (endpoints_t::value_type (
+        std::string (addr_), endpoint_)).second;
     if (!inserted) {
         errno = EADDRINUSE;
         endpoints_sync.unlock ();
@@ -281,19 +257,19 @@ void zmq::ctx_t::unregister_endpoints (socket_base_t *socket_)
 
     endpoints_t::iterator it = endpoints.begin ();
     while (it != endpoints.end ()) {
-        if (it->second == socket_) {
+        if (it->second.socket == socket_) {
             endpoints_t::iterator to_erase = it;
-            it++;
+            ++it;
             endpoints.erase (to_erase);
             continue;
         }
-        it++;
+        ++it;
     }
         
     endpoints_sync.unlock ();
 }
 
-zmq::socket_base_t *zmq::ctx_t::find_endpoint (const char *addr_)
+zmq::endpoint_t zmq::ctx_t::find_endpoint (const char *addr_)
 {
      endpoints_sync.lock ();
 
@@ -301,17 +277,37 @@ zmq::socket_base_t *zmq::ctx_t::find_endpoint (const char *addr_)
      if (it == endpoints.end ()) {
          endpoints_sync.unlock ();
          errno = ECONNREFUSED;
-         return NULL;
+         endpoint_t empty = {NULL, options_t()};
+         return empty;
      }
-     socket_base_t *endpoint = it->second;
+     endpoint_t *endpoint = &it->second;
 
      //  Increment the command sequence number of the peer so that it won't
      //  get deallocated until "bind" command is issued by the caller.
      //  The subsequent 'bind' has to be called with inc_seqnum parameter
      //  set to false, so that the seqnum isn't incremented twice.
-     endpoint->inc_seqnum ();
+     endpoint->socket->inc_seqnum ();
 
      endpoints_sync.unlock ();
-     return endpoint;
+     return *endpoint;
 }
 
+void zmq::ctx_t::log (const char *format_, va_list args_)
+{
+    //  Create the log message.
+    zmq_msg_t msg;
+    int rc = zmq_msg_init_size (&msg, strlen (format_) + 1);
+    zmq_assert (rc == 0);
+    memcpy (zmq_msg_data (&msg), format_, zmq_msg_size (&msg));
+
+    //  At this  point we migrate the log socket to the current thread.
+    //  We rely on mutex for executing the memory barrier.
+    log_sync.lock ();
+    if (log_socket)
+        log_socket->send (&msg, 0);
+    log_sync.unlock ();
+
+    zmq_msg_close (&msg);
+}
+
+
diff --git a/src/ctx.hpp b/src/ctx.hpp
index c96a923..c6ea4ce 100644
--- a/src/ctx.hpp
+++ b/src/ctx.hpp
@@ -1,39 +1,53 @@
 /*
-    Copyright (c) 2007-2010 iMatix Corporation
+    Copyright (c) 2007-2011 iMatix Corporation
+    Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
 
     This file is part of 0MQ.
 
     0MQ is free software; you can redistribute it and/or modify it under
-    the terms of the Lesser GNU General Public License as published by
+    the terms of the GNU Lesser General Public License as published by
     the Free Software Foundation; either version 3 of the License, or
     (at your option) any later version.
 
     0MQ is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    Lesser GNU General Public License for more details.
+    GNU Lesser General Public License for more details.
 
-    You should have received a copy of the Lesser GNU General Public License
+    You should have received a copy of the GNU Lesser General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
 #ifndef __ZMQ_CTX_HPP_INCLUDED__
 #define __ZMQ_CTX_HPP_INCLUDED__
 
-#include <vector>
-#include <set>
 #include <map>
+#include <vector>
 #include <string>
+#include <stdarg.h>
+
+#include "../include/zmq.h"
 
-#include "signaler.hpp"
+#include "mailbox.hpp"
+#include "semaphore.hpp"
 #include "ypipe.hpp"
+#include "array.hpp"
 #include "config.hpp"
 #include "mutex.hpp"
 #include "stdint.hpp"
 #include "thread.hpp"
+#include "options.hpp"
 
 namespace zmq
 {
+    //  Information associated with inproc endpoint. Note that endpoint options
+    //  are registered as well so that the peer can access them without a need
+    //  for synchronisation, handshaking or similar.
+    struct endpoint_t
+    {
+        class socket_base_t *socket;
+        options_t options;
+    };
 
     //  Context object encapsulates all the global state associated with
     //  the library.
@@ -50,104 +64,87 @@ namespace zmq
         //  no more sockets open it'll cause all the infrastructure to be shut
         //  down. If there are open sockets still, the deallocation happens
         //  after the last one is closed.
-        int term ();
+        int terminate ();
 
-        //  Create a socket.
+        //  Create and destroy a socket.
         class socket_base_t *create_socket (int type_);
-
-        //  Destroy a socket.
-        void destroy_socket ();
-
-        //  Called by app_thread_t when it has no more sockets. The function
-        //  should disassociate the object from the current OS thread.
-        void no_sockets (class app_thread_t *thread_);
+        void destroy_socket (class socket_base_t *socket_);
 
         //  Send command to the destination thread.
-        void send_command (uint32_t destination_, const command_t &command_);
-
-        //  Receive command from another thread.
-        bool recv_command (uint32_t thread_slot_, command_t *command_,
-            bool block_);
+        void send_command (uint32_t tid_, const command_t &command_);
 
         //  Returns the I/O thread that is the least busy at the moment.
-        //  Taskset specifies which I/O threads are eligible (0 = all).
-        class io_thread_t *choose_io_thread (uint64_t taskset_);
+        //  Affinity specifies which I/O threads are eligible (0 = all).
+        //  Returns NULL is no I/O thread is available.
+        class io_thread_t *choose_io_thread (uint64_t affinity_);
 
-        //  All pipes are registered with the context so that even the
-        //  orphaned pipes can be deallocated on the terminal shutdown.
-        void register_pipe (class pipe_t *pipe_);
-        void unregister_pipe (class pipe_t *pipe_);
+        //  Returns reaper thread object.
+        class object_t *get_reaper ();
 
         //  Management of inproc endpoints.
-        int register_endpoint (const char *addr_, class socket_base_t *socket_);
+        int register_endpoint (const char *addr_, endpoint_t &endpoint_);
         void unregister_endpoints (class socket_base_t *socket_);
-        class socket_base_t *find_endpoint (const char *addr_);
+        endpoint_t find_endpoint (const char *addr_);
+
+        //  Logging.
+        void log (const char *format_, va_list args_);
+
+        enum {
+            term_tid = 0,
+            reaper_tid = 1
+        };
 
     private:
 
         ~ctx_t ();
 
-        struct app_thread_info_t
-        {
-            //  If false, 0MQ application thread is free, there's no associated
-            //  OS thread.
-            bool associated;
+        //  Sockets belonging to this context. We need the list so that
+        //  we can notify the sockets when zmq_term() is called. The sockets
+        //  will return ETERM then.
+        typedef array_t <socket_base_t> sockets_t;
+        sockets_t sockets;
 
-            //  ID of the associated OS thread. If 'associated' is false,
-            //  this field contains bogus data.
-            thread_t::id_t tid;
+        //  List of unused thread slots.
+        typedef std::vector <uint32_t> emtpy_slots_t;
+        emtpy_slots_t empty_slots;
 
-            //  Pointer to the 0MQ application thread object.
-            class app_thread_t *app_thread;
-        };
+        //  If true, zmq_term was already called.
+        bool terminating;
 
-        //  Application threads.
-        typedef std::vector <app_thread_info_t> app_threads_t;
-        app_threads_t app_threads;
+        //  Synchronisation of accesses to global slot-related data:
+        //  sockets, empty_slots, terminating. It also synchronises
+        //  access to zombie sockets as such (as oposed to slots) and provides
+        //  a memory barrier to ensure that all CPU cores see the same data.
+        mutex_t slot_sync;
 
-        //  Synchronisation of accesses to shared application thread data.
-        mutex_t app_threads_sync;
+        //  The reaper thread.
+        class reaper_t *reaper;
 
         //  I/O threads.
         typedef std::vector <class io_thread_t*> io_threads_t;
         io_threads_t io_threads;
 
-        //  Array of pointers to signalers for both application and I/O threads.
-        int signalers_count;
-        signaler_t **signalers;
-
-        //  As pipes may reside in orphaned state in particular moments
-        //  of the pipe shutdown process, i.e. neither pipe reader nor
-        //  pipe writer hold reference to the pipe, we have to hold references
-        //  to all pipes in context so that we can deallocate them
-        //  during terminal shutdown even though it conincides with the
-        //  pipe being in the orphaned state.
-        typedef std::set <class pipe_t*> pipes_t;
-        pipes_t pipes;
+        //  Array of pointers to mailboxes for both application and I/O threads.
+        uint32_t slot_count;
+        mailbox_t **slots;
 
-        //  Synchronisation of access to the pipes repository.
-        mutex_t pipes_sync;
-
-        //  Number of sockets alive.
-        int sockets;
-
-        //  If true, zmq_term was already called. When last socket is closed
-        //  the whole 0MQ infrastructure should be deallocated.
-        bool terminated;
-
-        //  Synchronisation of access to the termination data (socket count
-        //  and 'terminated' flag).
-        mutex_t term_sync;
+        //  Mailbox for zmq_term thread.
+        mailbox_t term_mailbox;
 
         //  List of inproc endpoints within this context.
-        typedef std::map <std::string, class socket_base_t*> endpoints_t;
+        typedef std::map <std::string, endpoint_t> endpoints_t;
         endpoints_t endpoints;
 
         //  Synchronisation of access to the list of inproc endpoints.
         mutex_t endpoints_sync;
 
+        //  PUB socket for logging. The socket is shared among all the threads,
+        //  thus it is synchronised by a mutex.
+        class socket_base_t *log_socket;
+        mutex_t log_sync;
+
         ctx_t (const ctx_t&);
-        void operator = (const ctx_t&);
+        const ctx_t &operator = (const ctx_t&);
     };
     
 }
diff --git a/src/zmq_decoder.cpp b/src/decoder.cpp
index dcf8e76..c9a7dc9 100644
--- a/src/zmq_decoder.cpp
+++ b/src/decoder.cpp
@@ -1,114 +1,129 @@
 /*
-    Copyright (c) 2007-2010 iMatix Corporation
+    Copyright (c) 2007-2011 iMatix Corporation
+    Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
 
     This file is part of 0MQ.
 
     0MQ is free software; you can redistribute it and/or modify it under
-    the terms of the Lesser GNU General Public License as published by
+    the terms of the GNU Lesser General Public License as published by
     the Free Software Foundation; either version 3 of the License, or
     (at your option) any later version.
 
     0MQ is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    Lesser GNU General Public License for more details.
+    GNU Lesser General Public License for more details.
 
-    You should have received a copy of the Lesser GNU General Public License
+    You should have received a copy of the GNU Lesser General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
 #include <stdlib.h>
 #include <string.h>
 
-#include "zmq_decoder.hpp"
+#include "decoder.hpp"
 #include "i_inout.hpp"
 #include "wire.hpp"
 #include "err.hpp"
 
-zmq::zmq_decoder_t::zmq_decoder_t (size_t bufsize_) :
-    decoder_t <zmq_decoder_t> (bufsize_),
+zmq::decoder_t::decoder_t (size_t bufsize_) :
+    decoder_base_t <decoder_t> (bufsize_),
     destination (NULL)
 {
     zmq_msg_init (&in_progress);
 
     //  At the beginning, read one byte and go to one_byte_size_ready state.
-    next_step (tmpbuf, 1, &zmq_decoder_t::one_byte_size_ready);
+    next_step (tmpbuf, 1, &decoder_t::one_byte_size_ready);
 }
 
-zmq::zmq_decoder_t::~zmq_decoder_t ()
+zmq::decoder_t::~decoder_t ()
 {
     zmq_msg_close (&in_progress);
 }
 
-void zmq::zmq_decoder_t::set_inout (i_inout *destination_)
+void zmq::decoder_t::set_inout (i_inout *destination_)
 {
     destination = destination_;
 }
 
-bool zmq::zmq_decoder_t::one_byte_size_ready ()
+bool zmq::decoder_t::one_byte_size_ready ()
 {
     //  First byte of size is read. If it is 0xff read 8-byte size.
     //  Otherwise allocate the buffer for message data and read the
     //  message data into it.
     if (*tmpbuf == 0xff)
-        next_step (tmpbuf, 8, &zmq_decoder_t::eight_byte_size_ready);
+        next_step (tmpbuf, 8, &decoder_t::eight_byte_size_ready);
     else {
 
-        //  TODO:  Handle over-sized message decently.
-
         //  There has to be at least one byte (the flags) in the message).
-        zmq_assert (*tmpbuf > 0);
+        if (!*tmpbuf) {
+            decoding_error ();
+            return false;
+        }
 
         //  in_progress is initialised at this point so in theory we should
         //  close it before calling zmq_msg_init_size, however, it's a 0-byte
         //  message and thus we can treat it as uninitialised...
         int rc = zmq_msg_init_size (&in_progress, *tmpbuf - 1);
+        if (rc != 0 && errno == ENOMEM) {
+            rc = zmq_msg_init (&in_progress);
+            errno_assert (rc == 0);
+            decoding_error ();
+            return false;
+        }
         errno_assert (rc == 0);
-        next_step (tmpbuf, 1, &zmq_decoder_t::flags_ready);
+
+        next_step (tmpbuf, 1, &decoder_t::flags_ready);
     }
     return true;
 }
 
-bool zmq::zmq_decoder_t::eight_byte_size_ready ()
+bool zmq::decoder_t::eight_byte_size_ready ()
 {
     //  8-byte size is read. Allocate the buffer for message body and
     //  read the message data into it.
     size_t size = (size_t) get_uint64 (tmpbuf);
 
-    //  TODO:  Handle over-sized message decently.
-
     //  There has to be at least one byte (the flags) in the message).
-    zmq_assert (size > 0);
-
+    if (!size) {
+        decoding_error ();
+        return false;
+    }
 
     //  in_progress is initialised at this point so in theory we should
     //  close it before calling zmq_msg_init_size, however, it's a 0-byte
     //  message and thus we can treat it as uninitialised...
     int rc = zmq_msg_init_size (&in_progress, size - 1);
+    if (rc != 0 && errno == ENOMEM) {
+        rc = zmq_msg_init (&in_progress);
+        errno_assert (rc == 0);
+        decoding_error ();
+        return false;
+    }
     errno_assert (rc == 0);
-    next_step (tmpbuf, 1, &zmq_decoder_t::flags_ready);
 
+    next_step (tmpbuf, 1, &decoder_t::flags_ready);
     return true;
 }
 
-bool zmq::zmq_decoder_t::flags_ready ()
+bool zmq::decoder_t::flags_ready ()
 {
     //  Store the flags from the wire into the message structure.
     in_progress.flags = tmpbuf [0];
 
     next_step (zmq_msg_data (&in_progress), zmq_msg_size (&in_progress),
-        &zmq_decoder_t::message_ready);
+        &decoder_t::message_ready);
     
     return true;
 }
 
-bool zmq::zmq_decoder_t::message_ready ()
+bool zmq::decoder_t::message_ready ()
 {
     //  Message is completely read. Push it further and start reading
     //  new message. (in_progress is a 0-byte message after this point.)
     if (!destination || !destination->write (&in_progress))
         return false;
 
-    next_step (tmpbuf, 1, &zmq_decoder_t::one_byte_size_ready);
+    next_step (tmpbuf, 1, &decoder_t::one_byte_size_ready);
     return true;
 }
diff --git a/src/decoder.hpp b/src/decoder.hpp
index f05f651..f554e46 100644
--- a/src/decoder.hpp
+++ b/src/decoder.hpp
@@ -1,19 +1,20 @@
 /*
-    Copyright (c) 2007-2010 iMatix Corporation
+    Copyright (c) 2007-2011 iMatix Corporation
+    Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
 
     This file is part of 0MQ.
 
     0MQ is free software; you can redistribute it and/or modify it under
-    the terms of the Lesser GNU General Public License as published by
+    the terms of the GNU Lesser General Public License as published by
     the Free Software Foundation; either version 3 of the License, or
     (at your option) any later version.
 
     0MQ is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    Lesser GNU General Public License for more details.
+    GNU Lesser General Public License for more details.
 
-    You should have received a copy of the Lesser GNU General Public License
+    You should have received a copy of the GNU Lesser General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
@@ -27,37 +28,39 @@
 
 #include "err.hpp"
 
+#include "../include/zmq.h"
+
 namespace zmq
 {
 
     //  Helper base class for decoders that know the amount of data to read
     //  in advance at any moment. Knowing the amount in advance is a property
-    //  of the protocol used. Both AMQP and backend protocol are based on
-    //  size-prefixed paradigm, therefore they are using decoder_t to parse
-    //  the messages. On the other hand, XML-based transports (like XMPP or
-    //  SOAP) don't allow for knowing the size of data to read in advance and
-    //  should use different decoding algorithms.
+    //  of the protocol used. 0MQ framing protocol is based size-prefixed
+    //  paradigm, whixh qualifies it to be parsed by this class.
+    //  On the other hand, XML-based transports (like XMPP or SOAP) don't allow
+    //  for knowing the size of data to read in advance and should use different
+    //  decoding algorithms.
     //
-    //  Decoder implements the state machine that parses the incoming buffer.
+    //  This class implements the state machine that parses the incoming buffer.
     //  Derived class should implement individual state machine actions.
 
-    template <typename T> class decoder_t
+    template <typename T> class decoder_base_t
     {
     public:
 
-        inline decoder_t (size_t bufsize_) :
+        inline decoder_base_t (size_t bufsize_) :
             read_pos (NULL),
             to_read (0),
             next (NULL),
             bufsize (bufsize_)
         {
             buf = (unsigned char*) malloc (bufsize_);
-            zmq_assert (buf);
+            alloc_assert (buf);
         }
 
         //  The destructor doesn't have to be virtual. It is mad virtual
         //  just to keep ICC and code checking tools from complaining.
-        inline virtual ~decoder_t ()
+        inline virtual ~decoder_base_t ()
         {
             free (buf);
         }
@@ -89,6 +92,10 @@ namespace zmq
         //  bytes actually processed.
         inline size_t process_buffer (unsigned char *data_, size_t size_)
         {
+            //  Check if we had an error in previous attempt.
+            if (unlikely (!(static_cast <T*> (this)->next)))
+                return (size_t) -1;
+
             //  In case of zero-copy simply adjust the pointers, no copying
             //  is required. Also, run the state machine in case all the data
             //  were processed.
@@ -96,9 +103,13 @@ namespace zmq
                 read_pos += size_;
                 to_read -= size_;
 
-                while (!to_read)
-                    if (!(static_cast <T*> (this)->*next) ())
+                while (!to_read) {
+                    if (!(static_cast <T*> (this)->*next) ()) {
+                        if (unlikely (!(static_cast <T*> (this)->next)))
+                            return (size_t) -1;
                         return size_;
+                    }
+                }
                 return size_;
             }
 
@@ -107,9 +118,13 @@ namespace zmq
 
                 //  Try to get more space in the message to fill in.
                 //  If none is available, return.
-                while (!to_read)
-                    if (!(static_cast <T*> (this)->*next) ())
+                while (!to_read) {
+                    if (!(static_cast <T*> (this)->*next) ()) {
+                        if (unlikely (!(static_cast <T*> (this)->next)))
+                            return (size_t) -1;
                         return pos;
+                    }
+                }
 
                 //  If there are no more data in the buffer, return.
                 if (pos == size_)
@@ -140,6 +155,13 @@ namespace zmq
             next = next_;
         }
 
+        //  This function should be called from the derived class to
+        //  abort decoder state machine.
+        inline void decoding_error ()
+        {
+            next = NULL;
+        }
+
     private:
 
         unsigned char *read_pos;
@@ -149,6 +171,32 @@ namespace zmq
         size_t bufsize;
         unsigned char *buf;
 
+        decoder_base_t (const decoder_base_t&);
+        const decoder_base_t &operator = (const decoder_base_t&);
+    };
+
+    //  Decoder for 0MQ framing protocol. Converts data batches into messages.
+
+    class decoder_t : public decoder_base_t <decoder_t>
+    {
+    public:
+
+        decoder_t (size_t bufsize_);
+        ~decoder_t ();
+
+        void set_inout (struct i_inout *destination_);
+
+    private:
+
+        bool one_byte_size_ready ();
+        bool eight_byte_size_ready ();
+        bool flags_ready ();
+        bool message_ready ();
+
+        struct i_inout *destination;
+        unsigned char tmpbuf [8];
+        ::zmq_msg_t in_progress;
+
         decoder_t (const decoder_t&);
         void operator = (const decoder_t&);
     };
@@ -156,3 +204,4 @@ namespace zmq
 }
 
 #endif
+
diff --git a/src/queue.cpp b/src/device.cpp
index 36fab07..351283a 100644
--- a/src/queue.cpp
+++ b/src/device.cpp
@@ -1,19 +1,20 @@
 /*
-    Copyright (c) 2007-2010 iMatix Corporation
+    Copyright (c) 2007-2011 iMatix Corporation
+    Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
 
     This file is part of 0MQ.
 
     0MQ is free software; you can redistribute it and/or modify it under
-    the terms of the Lesser GNU General Public License as published by
+    the terms of the GNU Lesser General Public License as published by
     the Free Software Foundation; either version 3 of the License, or
     (at your option) any later version.
 
     0MQ is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    Lesser GNU General Public License for more details.
+    GNU Lesser General Public License for more details.
 
-    You should have received a copy of the Lesser GNU General Public License
+    You should have received a copy of the GNU Lesser General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
@@ -21,17 +22,20 @@
 
 #include "../include/zmq.h"
 
-#include "queue.hpp"
+#include "device.hpp"
 #include "socket_base.hpp"
 #include "likely.hpp"
 #include "err.hpp"
 
-int zmq::queue (class socket_base_t *insocket_,
+int zmq::device (class socket_base_t *insocket_,
         class socket_base_t *outsocket_)
 {
     zmq_msg_t msg;
     int rc = zmq_msg_init (&msg);
-    zmq_assert (rc == 0);
+
+    if (rc != 0) {
+        return -1;
+    }
 
     int64_t more;
     size_t moresz;
@@ -51,9 +55,7 @@ int zmq::queue (class socket_base_t *insocket_,
         //  Wait while there are either requests or replies to process.
         rc = zmq_poll (&items [0], 2, -1);
         if (unlikely (rc < 0)) {
-            if (errno == ETERM)
-                return -1;
-            errno_assert (false);
+            return -1;
         }
 
         //  The algorithm below asumes ratio of request and replies processed
@@ -67,24 +69,18 @@ int zmq::queue (class socket_base_t *insocket_,
 
                 rc = insocket_->recv (&msg, 0);
                 if (unlikely (rc < 0)) {
-                    if (errno == ETERM)
-                        return -1;
-                    errno_assert (false);
+                    return -1;
                 }
 
                 moresz = sizeof (more);
                 rc = insocket_->getsockopt (ZMQ_RCVMORE, &more, &moresz);
                 if (unlikely (rc < 0)) {
-                    if (errno == ETERM)
-                        return -1;
-                    errno_assert (false);
+                    return -1;
                 }
 
                 rc = outsocket_->send (&msg, more ? ZMQ_SNDMORE : 0);
                 if (unlikely (rc < 0)) {
-                    if (errno == ETERM)
-                        return -1;
-                    errno_assert (false);
+                    return -1;
                 }
 
                 if (!more)
@@ -98,24 +94,18 @@ int zmq::queue (class socket_base_t *insocket_,
 
                 rc = outsocket_->recv (&msg, 0);
                 if (unlikely (rc < 0)) {
-                    if (errno == ETERM)
-                        return -1;
-                    errno_assert (false);
+                    return -1;
                 }
 
                 moresz = sizeof (more);
                 rc = outsocket_->getsockopt (ZMQ_RCVMORE, &more, &moresz);
                 if (unlikely (rc < 0)) {
-                    if (errno == ETERM)
-                        return -1;
-                    errno_assert (false);
+                    return -1;
                 }
 
                 rc = insocket_->send (&msg, more ? ZMQ_SNDMORE : 0);
                 if (unlikely (rc < 0)) {
-                    if (errno == ETERM)
-                        return -1;
-                    errno_assert (false);
+                    return -1;
                 }
 
                 if (!more)
diff --git a/src/streamer.hpp b/src/device.hpp
index 8827cff..c5b7118 100644
--- a/src/streamer.hpp
+++ b/src/device.hpp
@@ -1,29 +1,30 @@
 /*
-    Copyright (c) 2007-2010 iMatix Corporation
+    Copyright (c) 2007-2011 iMatix Corporation
+    Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
 
     This file is part of 0MQ.
 
     0MQ is free software; you can redistribute it and/or modify it under
-    the terms of the Lesser GNU General Public License as published by
+    the terms of the GNU Lesser General Public License as published by
     the Free Software Foundation; either version 3 of the License, or
     (at your option) any later version.
 
     0MQ is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    Lesser GNU General Public License for more details.
+    GNU Lesser General Public License for more details.
 
-    You should have received a copy of the Lesser GNU General Public License
+    You should have received a copy of the GNU Lesser General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
-#ifndef __ZMQ_STREAMER_HPP_INCLUDED__
-#define __ZMQ_STREAMER_HPP_INCLUDED__
+#ifndef __ZMQ_DEVICE_HPP_INCLUDED__
+#define __ZMQ_DEVICE_HPP_INCLUDED__
 
 namespace zmq
 {
 
-    int streamer (class socket_base_t *insocket_,
+    int device (class socket_base_t *insocket_,
         class socket_base_t *outsocket_);
 
 }
diff --git a/src/devpoll.cpp b/src/devpoll.cpp
index 003f465..25763c6 100644
--- a/src/devpoll.cpp
+++ b/src/devpoll.cpp
@@ -1,19 +1,20 @@
 /*
-    Copyright (c) 2007-2010 iMatix Corporation
+    Copyright (c) 2007-2011 iMatix Corporation
+    Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
 
     This file is part of 0MQ.
 
     0MQ is free software; you can redistribute it and/or modify it under
-    the terms of the Lesser GNU General Public License as published by
+    the terms of the GNU Lesser General Public License as published by
     the Free Software Foundation; either version 3 of the License, or
     (at your option) any later version.
 
     0MQ is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    Lesser GNU General Public License for more details.
+    GNU Lesser General Public License for more details.
 
-    You should have received a copy of the Lesser GNU General Public License
+    You should have received a copy of the GNU Lesser General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
@@ -23,7 +24,6 @@
 
 #include <sys/devpoll.h>
 #include <sys/time.h>
-#include <sys/resource.h>
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <sys/ioctl.h>
@@ -40,15 +40,6 @@
 zmq::devpoll_t::devpoll_t () :
     stopping (false)
 {
-    //  Get limit on open files
-    struct rlimit rl;
-    int rc = getrlimit (RLIMIT_NOFILE, &rl);
-    errno_assert (rc != -1);
-    fd_table.resize (rl.rlim_cur);
-
-    for (rlim_t i = 0; i < rl.rlim_cur; i ++)
-        fd_table [i].valid = false;
-
     devpoll_fd = open ("/dev/poll", O_RDWR);
     errno_assert (devpoll_fd != -1);
 }
@@ -56,10 +47,6 @@ zmq::devpoll_t::devpoll_t () :
 zmq::devpoll_t::~devpoll_t ()
 {
     worker.stop ();
-
-    //  Make sure there are no fds registered on shutdown.
-    zmq_assert (load.get () == 0);
-
     close (devpoll_fd);
 }
 
@@ -73,6 +60,16 @@ void zmq::devpoll_t::devpoll_ctl (fd_t fd_, short events_)
 zmq::devpoll_t::handle_t zmq::devpoll_t::add_fd (fd_t fd_,
     i_poll_events *reactor_)
 {
+    //  If the file descriptor table is too small expand it.
+    fd_table_t::size_type sz = fd_table.size ();
+    if (sz <= (fd_table_t::size_type) fd_) {
+        fd_table.resize (fd_ + 1);
+        while (sz != (fd_table_t::size_type) (fd_ + 1)) {
+            fd_table [sz].valid = false;
+            ++sz;
+        }
+    }
+
     assert (!fd_table [fd_].valid);
 
     fd_table [fd_].events = 0;
@@ -84,7 +81,7 @@ zmq::devpoll_t::handle_t zmq::devpoll_t::add_fd (fd_t fd_,
     pending_list.push_back (fd_);
 
     //  Increase the load metric of the thread.
-    load.add (1);
+    adjust_load (1);
 
     return fd_;
 }
@@ -97,7 +94,7 @@ void zmq::devpoll_t::rm_fd (handle_t handle_)
     fd_table [handle_].valid = false;
 
     //  Decrease the load metric of the thread.
-    load.sub (1);
+    adjust_load (-1);
 }
 
 void zmq::devpoll_t::set_pollin (handle_t handle_)
@@ -128,23 +125,6 @@ void zmq::devpoll_t::reset_pollout (handle_t handle_)
     devpoll_ctl (handle_, fd_table [handle_].events);
 }
 
-void zmq::devpoll_t::add_timer (i_poll_events *events_)
-{
-     timers.push_back (events_);
-}
-
-void zmq::devpoll_t::cancel_timer (i_poll_events *events_)
-{
-    timers_t::iterator it = std::find (timers.begin (), timers.end (), events_);
-    if (it != timers.end ())
-        timers.erase (it);
-}
-
-int zmq::devpoll_t::get_load ()
-{
-    return load.get ();
-}
-
 void zmq::devpoll_t::start ()
 {
     worker.start (worker_routine, this);
@@ -157,10 +137,6 @@ void zmq::devpoll_t::stop ()
 
 void zmq::devpoll_t::loop ()
 {
-    //  According to the poll(7d) man page, we can retrieve
-    //  no more then (OPEN_MAX - 1) events.
-    int nfds = std::min ((int) max_io_events, OPEN_MAX - 1);
-
     while (!stopping) {
 
         struct pollfd ev_buf [max_io_events];
@@ -170,31 +146,23 @@ void zmq::devpoll_t::loop ()
             fd_table [pending_list [i]].accepted = true;
         pending_list.clear ();
 
-        poll_req.dp_fds = &ev_buf [0];
-        poll_req.dp_nfds = nfds;
-        poll_req.dp_timeout = timers.empty () ? -1 : max_timer_period;
+        //  Execute any due timers.
+        int timeout = (int) execute_timers ();
 
         //  Wait for events.
+        //  On Solaris, we can retrieve no more then (OPEN_MAX - 1) events.
+        poll_req.dp_fds = &ev_buf [0];
+#if defined ZMQ_HAVE_SOLARIS
+        poll_req.dp_nfds = std::min ((int) max_io_events, OPEN_MAX - 1);
+#else
+        poll_req.dp_nfds = max_io_events;
+#endif
+        poll_req.dp_timeout = timeout ? timeout : -1;
         int n = ioctl (devpoll_fd, DP_POLL, &poll_req);
         if (n == -1 && errno == EINTR)
             continue;
         errno_assert (n != -1);
 
-        //  Handle timer.
-        if (!n) {
-
-            //  Use local list of timers as timer handlers may fill new timers
-            //  into the original array.
-            timers_t t;
-            std::swap (timers, t);
-
-            //  Trigger all the timers.
-            for (timers_t::iterator it = t.begin (); it != t.end (); it ++)
-                (*it)->timer_event ();
-
-            continue;
-        }
-
         for (int i = 0; i < n; i ++) {
 
             fd_entry_t *fd_ptr = &fd_table [ev_buf [i].fd];
diff --git a/src/devpoll.hpp b/src/devpoll.hpp
index 019d268..2eaaeb2 100644
--- a/src/devpoll.hpp
+++ b/src/devpoll.hpp
@@ -1,19 +1,20 @@
 /*
-    Copyright (c) 2007-2010 iMatix Corporation
+    Copyright (c) 2007-2011 iMatix Corporation
+    Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
 
     This file is part of 0MQ.
 
     0MQ is free software; you can redistribute it and/or modify it under
-    the terms of the Lesser GNU General Public License as published by
+    the terms of the GNU Lesser General Public License as published by
     the Free Software Foundation; either version 3 of the License, or
     (at your option) any later version.
 
     0MQ is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    Lesser GNU General Public License for more details.
+    GNU Lesser General Public License for more details.
 
-    You should have received a copy of the Lesser GNU General Public License
+    You should have received a copy of the GNU Lesser General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
@@ -22,21 +23,20 @@
 
 #include "platform.hpp"
 
-#if defined ZMQ_HAVE_SOLARIS || ZMQ_HAVE_HPUX
+#if defined ZMQ_HAVE_SOLARIS || defined ZMQ_HAVE_HPUX
 
 #include <vector>
 
 #include "fd.hpp"
 #include "thread.hpp"
-#include "atomic_counter.hpp"
+#include "poller_base.hpp"
 
 namespace zmq
 {
 
-    //  Implements socket polling mechanism using the Solaris-specific
-    //  "/dev/poll" interface.
+    //  Implements socket polling mechanism using the "/dev/poll" interface.
 
-    class devpoll_t
+    class devpoll_t : public poller_base_t
     {
     public:
 
@@ -52,9 +52,6 @@ namespace zmq
         void reset_pollin (handle_t handle_);
         void set_pollout (handle_t handle_);
         void reset_pollout (handle_t handle_);
-        void add_timer (struct i_poll_events *events_);
-        void cancel_timer (struct i_poll_events *events_);
-        int get_load ();
         void start ();
         void stop ();
 
@@ -77,7 +74,8 @@ namespace zmq
             bool accepted;
         };
 
-        std::vector <fd_entry_t> fd_table;
+        typedef std::vector <fd_entry_t> fd_table_t;
+        fd_table_t fd_table;
 
         typedef std::vector <fd_t> pending_list_t;
         pending_list_t pending_list;
@@ -85,22 +83,14 @@ namespace zmq
         //  Pollset manipulation function.
         void devpoll_ctl (fd_t fd_, short events_);
 
-        //  List of all the engines waiting for the timer event.
-        typedef std::vector <struct i_poll_events*> timers_t;
-        timers_t timers;
-
         //  If true, thread is in the process of shutting down.
         bool stopping;
 
         //  Handle of the physical thread doing the I/O work.
         thread_t worker;
 
-        //  Load of the poller. Currently number of file descriptors
-        //  registered with the poller.
-        atomic_counter_t load;
-
         devpoll_t (const devpoll_t&);
-        void operator = (const devpoll_t&);
+        const devpoll_t &operator = (const devpoll_t&);
     };
 
 }
diff --git a/src/dist.cpp b/src/dist.cpp
new file mode 100644
index 0000000..e447bc1
--- /dev/null
+++ b/src/dist.cpp
@@ -0,0 +1,196 @@
+/*
+    Copyright (c) 2007-2011 iMatix Corporation
+    Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
+
+    This file is part of 0MQ.
+
+    0MQ is free software; you can redistribute it and/or modify it under
+    the terms of the GNU Lesser General Public License as published by
+    the Free Software Foundation; either version 3 of the License, or
+    (at your option) any later version.
+
+    0MQ is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU Lesser General Public License for more details.
+
+    You should have received a copy of the GNU Lesser General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "../include/zmq.h"
+
+#include "dist.hpp"
+#include "pipe.hpp"
+#include "err.hpp"
+#include "own.hpp"
+#include "msg_content.hpp"
+
+zmq::dist_t::dist_t (own_t *sink_) :
+    active (0),
+    more (false),
+    sink (sink_),
+    terminating (false)
+{
+}
+
+zmq::dist_t::~dist_t ()
+{
+    zmq_assert (pipes.empty ());
+}
+
+void zmq::dist_t::attach (writer_t *pipe_)
+{
+    //  If we are in the middle of sending a message, let's postpone plugging
+    //  in the pipe.
+    if (!terminating && more) {
+        new_pipes.push_back (pipe_);
+        return;
+    }
+
+    pipe_->set_event_sink (this);
+
+    pipes.push_back (pipe_);
+    pipes.swap (active, pipes.size () - 1);
+    active++;
+
+    if (terminating) {
+        sink->register_term_acks (1);
+        pipe_->terminate ();
+    }
+}
+
+void zmq::dist_t::terminate ()
+{
+    zmq_assert (!terminating);
+    terminating = true;
+
+    sink->register_term_acks (pipes.size ());
+    for (pipes_t::size_type i = 0; i != pipes.size (); i++)
+        pipes [i]->terminate ();
+}
+
+void zmq::dist_t::terminated (writer_t *pipe_)
+{
+    //  Remove the pipe from the list; adjust number of active pipes
+    //  accordingly.
+    if (pipes.index (pipe_) < active)
+        active--;
+    pipes.erase (pipe_);
+
+    if (terminating)
+        sink->unregister_term_ack ();
+}
+
+void zmq::dist_t::activated (writer_t *pipe_)
+{
+    //  Move the pipe to the list of active pipes.
+    pipes.swap (pipes.index (pipe_), active);
+    active++;
+}
+
+int zmq::dist_t::send (zmq_msg_t *msg_, int flags_)
+{
+    //  Is this end of a multipart message?
+    bool msg_more = msg_->flags & ZMQ_MSG_MORE;
+
+    //  Push the message to active pipes.
+    distribute (msg_, flags_);
+
+    //  If mutlipart message is fully sent, activate new pipes.
+    if (more && !msg_more)
+        clear_new_pipes ();
+
+    more = msg_more;
+
+    return 0;
+}
+
+void zmq::dist_t::distribute (zmq_msg_t *msg_, int flags_)
+{
+    //  If there are no active pipes available, simply drop the message.
+    if (active == 0) {
+        int rc = zmq_msg_close (msg_);
+        zmq_assert (rc == 0);
+        rc = zmq_msg_init (msg_);
+        zmq_assert (rc == 0);
+        return;
+    }
+
+    msg_content_t *content = (msg_content_t*) msg_->content;
+
+    //  For VSMs the copying is straighforward.
+    if (content == (msg_content_t*) ZMQ_VSM) {
+        for (pipes_t::size_type i = 0; i < active;)
+            if (write (pipes [i], msg_))
+                i++;
+        int rc = zmq_msg_init (msg_);
+        zmq_assert (rc == 0);
+        return;
+    }
+
+    //  Optimisation for the case when there's only a single pipe
+    //  to send the message to - no refcount adjustment i.e. no atomic
+    //  operations are needed.
+    if (active == 1) {
+        if (!write (pipes [0], msg_)) {
+            int rc = zmq_msg_close (msg_);
+            zmq_assert (rc == 0);
+        }
+        int rc = zmq_msg_init (msg_);
+        zmq_assert (rc == 0);
+        return;
+    }
+
+    //  There are at least 2 destinations for the message. That means we have
+    //  to deal with reference counting. First add N-1 references to
+    //  the content (we are holding one reference anyway, that's why -1).
+    if (msg_->flags & ZMQ_MSG_SHARED)
+        content->refcnt.add (active - 1);
+    else {
+        content->refcnt.set (active);
+        msg_->flags |= ZMQ_MSG_SHARED;
+    }
+
+    //  Push the message to all destinations.
+    for (pipes_t::size_type i = 0; i < active;) {
+        if (!write (pipes [i], msg_))
+            content->refcnt.sub (1);
+        else
+            i++;
+    }
+
+    //  Detach the original message from the data buffer.
+    int rc = zmq_msg_init (msg_);
+    zmq_assert (rc == 0);
+}
+
+bool zmq::dist_t::has_out ()
+{
+    return true;
+}
+
+bool zmq::dist_t::write (class writer_t *pipe_, zmq_msg_t *msg_)
+{
+    if (!pipe_->write (msg_)) {
+        active--;
+        pipes.swap (pipes.index (pipe_), active);
+        return false;
+    }
+    if (!(msg_->flags & ZMQ_MSG_MORE))
+        pipe_->flush ();
+    return true;
+}
+
+void zmq::dist_t::clear_new_pipes ()
+{
+    for (new_pipes_t::iterator it = new_pipes.begin (); it != new_pipes.end ();
+          ++it) {
+        (*it)->set_event_sink (this);
+        pipes.push_back (*it);
+        pipes.swap (active, pipes.size () - 1);
+        active++;
+    }
+    new_pipes.clear ();
+}
+
diff --git a/src/dist.hpp b/src/dist.hpp
new file mode 100644
index 0000000..ad9767a
--- /dev/null
+++ b/src/dist.hpp
@@ -0,0 +1,92 @@
+/*
+    Copyright (c) 2007-2011 iMatix Corporation
+    Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
+
+    This file is part of 0MQ.
+
+    0MQ is free software; you can redistribute it and/or modify it under
+    the terms of the GNU Lesser General Public License as published by
+    the Free Software Foundation; either version 3 of the License, or
+    (at your option) any later version.
+
+    0MQ is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU Lesser General Public License for more details.
+
+    You should have received a copy of the GNU Lesser General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef __ZMQ_DIST_HPP_INCLUDED__
+#define __ZMQ_DIST_HPP_INCLUDED__
+
+#include <vector>
+
+#include "array.hpp"
+#include "pipe.hpp"
+
+namespace zmq
+{
+
+    //  Class manages a set of outbound pipes. It sends each messages to
+    //  each of them.
+    class dist_t : public i_writer_events
+    {
+    public:
+
+        dist_t (class own_t *sink_);
+        ~dist_t ();
+
+        void attach (writer_t *pipe_);
+        void terminate ();
+        int send (zmq_msg_t *msg_, int flags_);
+        bool has_out ();
+
+        //  i_writer_events interface implementation.
+        void activated (writer_t *pipe_);
+        void terminated (writer_t *pipe_);
+
+    private:
+
+        //  Write the message to the pipe. Make the pipe inactive if writing
+        //  fails. In such a case false is returned.
+        bool write (class writer_t *pipe_, zmq_msg_t *msg_);
+
+        //  Put the message to all active pipes.
+        void distribute (zmq_msg_t *msg_, int flags_);
+
+        //  Plug in all the delayed pipes.
+        void clear_new_pipes ();
+
+        //  List of outbound pipes.
+        typedef array_t <class writer_t> pipes_t;
+        pipes_t pipes;
+
+        //  List of new pipes that were not yet inserted into 'pipes' list.
+        //  These pipes are moves to 'pipes' list once the current multipart
+        //  message is fully sent. This way we avoid sending incomplete messages
+        //  to peers.
+        typedef std::vector <class writer_t*> new_pipes_t;
+        new_pipes_t new_pipes;
+
+        //  Number of active pipes. All the active pipes are located at the
+        //  beginning of the pipes array.
+        pipes_t::size_type active;
+
+        //  True if last we are in the middle of a multipart message.
+        bool more;
+
+        //  Object to send events to.
+        class own_t *sink;
+
+        //  If true, termination process is already underway.
+        bool terminating;
+
+        dist_t (const dist_t&);
+        const dist_t &operator = (const dist_t&);
+    };
+
+}
+
+#endif
diff --git a/src/zmq_encoder.cpp b/src/encoder.cpp
index 077286f..88e1dff 100644
--- a/src/zmq_encoder.cpp
+++ b/src/encoder.cpp
@@ -1,58 +1,59 @@
 /*
-    Copyright (c) 2007-2010 iMatix Corporation
+    Copyright (c) 2007-2011 iMatix Corporation
+    Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
 
     This file is part of 0MQ.
 
     0MQ is free software; you can redistribute it and/or modify it under
-    the terms of the Lesser GNU General Public License as published by
+    the terms of the GNU Lesser General Public License as published by
     the Free Software Foundation; either version 3 of the License, or
     (at your option) any later version.
 
     0MQ is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    Lesser GNU General Public License for more details.
+    GNU Lesser General Public License for more details.
 
-    You should have received a copy of the Lesser GNU General Public License
+    You should have received a copy of the GNU Lesser General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
-#include "zmq_encoder.hpp"
+#include "encoder.hpp"
 #include "i_inout.hpp"
 #include "wire.hpp"
 
-zmq::zmq_encoder_t::zmq_encoder_t (size_t bufsize_) :
-    encoder_t <zmq_encoder_t> (bufsize_),
+zmq::encoder_t::encoder_t (size_t bufsize_) :
+    encoder_base_t <encoder_t> (bufsize_),
     source (NULL)
 {
     zmq_msg_init (&in_progress);
 
     //  Write 0 bytes to the batch and go to message_ready state.
-    next_step (NULL, 0, &zmq_encoder_t::message_ready, true);
+    next_step (NULL, 0, &encoder_t::message_ready, true);
 }
 
-zmq::zmq_encoder_t::~zmq_encoder_t ()
+zmq::encoder_t::~encoder_t ()
 {
     zmq_msg_close (&in_progress);
 }
 
-void zmq::zmq_encoder_t::set_inout (i_inout *source_)
+void zmq::encoder_t::set_inout (i_inout *source_)
 {
     source = source_;
 }
 
-bool zmq::zmq_encoder_t::size_ready ()
+bool zmq::encoder_t::size_ready ()
 {
     //  Write message body into the buffer.
     next_step (zmq_msg_data (&in_progress), zmq_msg_size (&in_progress),
-        &zmq_encoder_t::message_ready, false);
+        &encoder_t::message_ready, false);
     return true;
 }
 
-bool zmq::zmq_encoder_t::message_ready ()
+bool zmq::encoder_t::message_ready ()
 {
     //  Destroy content of the old message.
-    zmq_msg_close(&in_progress);
+    zmq_msg_close (&in_progress);
 
     //  Read new message. If there is none, return false.
     //  Note that new state is set only if write is successful. That way
@@ -75,14 +76,14 @@ bool zmq::zmq_encoder_t::message_ready ()
     if (size < 255) {
         tmpbuf [0] = (unsigned char) size;
         tmpbuf [1] = (in_progress.flags & ~ZMQ_MSG_SHARED);
-        next_step (tmpbuf, 2, &zmq_encoder_t::size_ready,
+        next_step (tmpbuf, 2, &encoder_t::size_ready,
             !(in_progress.flags & ZMQ_MSG_MORE));
     }
     else {
         tmpbuf [0] = 0xff;
         put_uint64 (tmpbuf + 1, size);
         tmpbuf [9] = (in_progress.flags & ~ZMQ_MSG_SHARED);
-        next_step (tmpbuf, 10, &zmq_encoder_t::size_ready,
+        next_step (tmpbuf, 10, &encoder_t::size_ready,
             !(in_progress.flags & ZMQ_MSG_MORE));
     }
     return true;
diff --git a/src/encoder.hpp b/src/encoder.hpp
index 0d5b6ba..918ec2b 100644
--- a/src/encoder.hpp
+++ b/src/encoder.hpp
@@ -1,30 +1,26 @@
 /*
-    Copyright (c) 2007-2010 iMatix Corporation
+    Copyright (c) 2007-2011 iMatix Corporation
+    Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
 
     This file is part of 0MQ.
 
     0MQ is free software; you can redistribute it and/or modify it under
-    the terms of the Lesser GNU General Public License as published by
+    the terms of the GNU Lesser General Public License as published by
     the Free Software Foundation; either version 3 of the License, or
     (at your option) any later version.
 
     0MQ is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    Lesser GNU General Public License for more details.
+    GNU Lesser General Public License for more details.
 
-    You should have received a copy of the Lesser GNU General Public License
+    You should have received a copy of the GNU Lesser General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
 #ifndef __ZMQ_ENCODER_HPP_INCLUDED__
 #define __ZMQ_ENCODER_HPP_INCLUDED__
 
-#include "platform.hpp"
-#if defined ZMQ_HAVE_WINDOWS
-#include "windows.hpp"
-#endif
-
 #include <stddef.h>
 #include <string.h>
 #include <stdlib.h>
@@ -32,6 +28,8 @@
 
 #include "err.hpp"
 
+#include "../include/zmq.h"
+
 namespace zmq
 {
 
@@ -39,20 +37,20 @@ namespace zmq
     //  fills the outgoing buffer. Derived classes should implement individual
     //  state machine actions.
 
-    template <typename T> class encoder_t
+    template <typename T> class encoder_base_t
     {
     public:
 
-        inline encoder_t (size_t bufsize_) :
+        inline encoder_base_t (size_t bufsize_) :
             bufsize (bufsize_)
         {
             buf = (unsigned char*) malloc (bufsize_);
-            zmq_assert (buf);
+            alloc_assert (buf);
         }
 
-        //  The destructor doesn't have to be virtual. It is mad virtual
+        //  The destructor doesn't have to be virtual. It is made virtual
         //  just to keep ICC and code checking tools from complaining.
-        inline virtual ~encoder_t ()
+        inline virtual ~encoder_base_t ()
         {
             free (buf);
         }
@@ -153,10 +151,34 @@ namespace zmq
         size_t bufsize;
         unsigned char *buf;
 
-        encoder_t (const encoder_t&);
-        void operator = (const encoder_t&);
+        encoder_base_t (const encoder_base_t&);
+        void operator = (const encoder_base_t&);
     };
 
+    //  Encoder for 0MQ framing protocol. Converts messages into data batches.
+
+    class encoder_t : public encoder_base_t <encoder_t>
+    {
+    public:
+
+        encoder_t (size_t bufsize_);
+        ~encoder_t ();
+
+        void set_inout (struct i_inout *source_);
+
+    private:
+
+        bool size_ready ();
+        bool message_ready ();
+
+        struct i_inout *source;
+        ::zmq_msg_t in_progress;
+        unsigned char tmpbuf [10];
+
+        encoder_t (const encoder_t&);
+        const encoder_t &operator = (const encoder_t&);
+    };
 }
 
 #endif
+
diff --git a/src/epoll.cpp b/src/epoll.cpp
index e22eb8c..2c84f8c 100644
--- a/src/epoll.cpp
+++ b/src/epoll.cpp
@@ -1,19 +1,20 @@
 /*
-    Copyright (c) 2007-2010 iMatix Corporation
+    Copyright (c) 2007-2011 iMatix Corporation
+    Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
 
     This file is part of 0MQ.
 
     0MQ is free software; you can redistribute it and/or modify it under
-    the terms of the Lesser GNU General Public License as published by
+    the terms of the GNU Lesser General Public License as published by
     the Free Software Foundation; either version 3 of the License, or
     (at your option) any later version.
 
     0MQ is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    Lesser GNU General Public License for more details.
+    GNU Lesser General Public License for more details.
 
-    You should have received a copy of the Lesser GNU General Public License
+    You should have received a copy of the GNU Lesser General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
@@ -45,18 +46,15 @@ zmq::epoll_t::~epoll_t ()
     //  Wait till the worker thread exits.
     worker.stop ();
 
-    //  Make sure there are no fds registered on shutdown.
-    zmq_assert (load.get () == 0);
-
     close (epoll_fd);
-    for (retired_t::iterator it = retired.begin (); it != retired.end (); it ++)
+    for (retired_t::iterator it = retired.begin (); it != retired.end (); ++it)
         delete *it;
 }
 
 zmq::epoll_t::handle_t zmq::epoll_t::add_fd (fd_t fd_, i_poll_events *events_)
 {
     poll_entry_t *pe = new (std::nothrow) poll_entry_t;
-    zmq_assert (pe != NULL);
+    alloc_assert (pe);
 
     //  The memset is not actually needed. It's here to prevent debugging
     //  tools to complain about using uninitialised memory.
@@ -71,7 +69,7 @@ zmq::epoll_t::handle_t zmq::epoll_t::add_fd (fd_t fd_, i_poll_events *events_)
     errno_assert (rc != -1);
 
     //  Increase the load metric of the thread.
-    load.add (1);
+    adjust_load (1);
 
     return pe;
 }
@@ -85,7 +83,7 @@ void zmq::epoll_t::rm_fd (handle_t handle_)
     retired.push_back (pe);
 
     //  Decrease the load metric of the thread.
-    load.sub (1);
+    adjust_load (-1);
 }
 
 void zmq::epoll_t::set_pollin (handle_t handle_)
@@ -120,24 +118,6 @@ void zmq::epoll_t::reset_pollout (handle_t handle_)
     errno_assert (rc != -1);
 }
 
-void zmq::epoll_t::add_timer (i_poll_events *events_)
-{
-     timers.push_back (events_);
-}
-
-void zmq::epoll_t::cancel_timer (i_poll_events *events_)
-{
-    timers_t::iterator it = std::find (timers.begin (), timers.end (), events_);
-    if (it == timers.end ())
-        return;
-    timers.erase (it);
-}
-
-int zmq::epoll_t::get_load ()
-{
-    return load.get ();
-}
-
 void zmq::epoll_t::start ()
 {
     worker.start (worker_routine, this);
@@ -154,31 +134,15 @@ void zmq::epoll_t::loop ()
 
     while (!stopping) {
 
-        //  Wait for events.
-        int n;
-        while (true) {
-            n = epoll_wait (epoll_fd, &ev_buf [0], max_io_events,
-                timers.empty () ? -1 : max_timer_period);
-            if (!(n == -1 && errno == EINTR)) {
-                errno_assert (n != -1);
-                break;
-            }
-        }
-
-        //  Handle timer.
-        if (!n) {
-
-            //  Use local list of timers as timer handlers may fill new timers
-            //  into the original array.
-            timers_t t;
-            std::swap (timers, t);
-
-            //  Trigger all the timers.
-            for (timers_t::iterator it = t.begin (); it != t.end (); it ++)
-                (*it)->timer_event ();
+        //  Execute any due timers.
+        int timeout = (int) execute_timers ();
 
+        //  Wait for events.
+        int n = epoll_wait (epoll_fd, &ev_buf [0], max_io_events,
+            timeout ? timeout : -1);
+        if (n == -1 && errno == EINTR)
             continue;
-        }
+        errno_assert (n != -1);
 
         for (int i = 0; i < n; i ++) {
             poll_entry_t *pe = ((poll_entry_t*) ev_buf [i].data.ptr);
@@ -199,7 +163,7 @@ void zmq::epoll_t::loop ()
 
         //  Destroy retired event sources.
         for (retired_t::iterator it = retired.begin (); it != retired.end ();
-              it ++)
+              ++it)
             delete *it;
         retired.clear ();
     }
diff --git a/src/epoll.hpp b/src/epoll.hpp
index 38175cb..7e5195e 100644
--- a/src/epoll.hpp
+++ b/src/epoll.hpp
@@ -1,19 +1,20 @@
 /*
-    Copyright (c) 2007-2010 iMatix Corporation
+    Copyright (c) 2007-2011 iMatix Corporation
+    Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
 
     This file is part of 0MQ.
 
     0MQ is free software; you can redistribute it and/or modify it under
-    the terms of the Lesser GNU General Public License as published by
+    the terms of the GNU Lesser General Public License as published by
     the Free Software Foundation; either version 3 of the License, or
     (at your option) any later version.
 
     0MQ is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    Lesser GNU General Public License for more details.
+    GNU Lesser General Public License for more details.
 
-    You should have received a copy of the Lesser GNU General Public License
+    You should have received a copy of the GNU Lesser General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
@@ -29,7 +30,7 @@
 
 #include "fd.hpp"
 #include "thread.hpp"
-#include "atomic_counter.hpp"
+#include "poller_base.hpp"
 
 namespace zmq
 {
@@ -37,7 +38,7 @@ namespace zmq
     //  This class implements socket polling mechanism using the Linux-specific
     //  epoll mechanism.
 
-    class epoll_t
+    class epoll_t : public poller_base_t
     {
     public:
 
@@ -53,9 +54,6 @@ namespace zmq
         void reset_pollin (handle_t handle_);
         void set_pollout (handle_t handle_);
         void reset_pollout (handle_t handle_);
-        void add_timer (struct i_poll_events *events_);
-        void cancel_timer (struct i_poll_events *events_);
-        int get_load ();
         void start ();
         void stop ();
 
@@ -81,22 +79,14 @@ namespace zmq
         typedef std::vector <poll_entry_t*> retired_t;
         retired_t retired;
 
-        //  List of all the engines waiting for the timer event.
-        typedef std::vector <struct i_poll_events*> timers_t;
-        timers_t timers;
-
         //  If true, thread is in the process of shutting down.
         bool stopping;
 
         //  Handle of the physical thread doing the I/O work.
         thread_t worker;
 
-        //  Load of the poller. Currently number of file descriptors
-        //  registered with the poller.
-        atomic_counter_t load;
-
         epoll_t (const epoll_t&);
-        void operator = (const epoll_t&);
+        const epoll_t &operator = (const epoll_t&);
     };
 
 }
diff --git a/src/err.cpp b/src/err.cpp
index 17a9689..8761c22 100644
--- a/src/err.cpp
+++ b/src/err.cpp
@@ -1,19 +1,20 @@
 /*
-    Copyright (c) 2007-2010 iMatix Corporation
+    Copyright (c) 2007-2011 iMatix Corporation
+    Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
 
     This file is part of 0MQ.
 
     0MQ is free software; you can redistribute it and/or modify it under
-    the terms of the Lesser GNU General Public License as published by
+    the terms of the GNU Lesser General Public License as published by
     the Free Software Foundation; either version 3 of the License, or
     (at your option) any later version.
 
     0MQ is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    Lesser GNU General Public License for more details.
+    GNU Lesser General Public License for more details.
 
-    You should have received a copy of the Lesser GNU General Public License
+    You should have received a copy of the GNU Lesser General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
@@ -22,6 +23,47 @@
 #include "err.hpp"
 #include "platform.hpp"
 
+const char *zmq::errno_to_string (int errno_)
+{
+    switch (errno_) {
+#if defined ZMQ_HAVE_WINDOWS
+    case ENOTSUP:
+        return "Not supported";
+    case EPROTONOSUPPORT:
+        return "Protocol not supported";
+    case ENOBUFS:
+        return "No buffer space available";
+    case ENETDOWN:
+        return "Network is down";
+    case EADDRINUSE:
+        return "Address in use";
+    case EADDRNOTAVAIL:
+        return "Address not available";
+    case ECONNREFUSED:
+        return "Connection refused";
+    case EINPROGRESS:
+        return "Operation in progress";
+#endif
+    case EFSM:
+        return "Operation cannot be accomplished in current state";
+    case ENOCOMPATPROTO:
+        return "The protocol is not compatible with the socket type";
+    case ETERM:
+        return "Context was terminated";
+    case EMTHREAD:
+        return "No thread available";
+    default:
+#if defined _MSC_VER
+#pragma warning (push)
+#pragma warning (disable:4996)
+#endif
+        return strerror (errno_);
+#if defined _MSC_VER
+#pragma warning (pop)
+#endif
+    }
+}
+
 #ifdef ZMQ_HAVE_WINDOWS
 
 const char *zmq::wsa_error()
diff --git a/src/err.hpp b/src/err.hpp
index 2b76569..3ffd99d 100644
--- a/src/err.hpp
+++ b/src/err.hpp
@@ -1,19 +1,20 @@
 /*
-    Copyright (c) 2007-2010 iMatix Corporation
+    Copyright (c) 2007-2011 iMatix Corporation
+    Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
 
     This file is part of 0MQ.
 
     0MQ is free software; you can redistribute it and/or modify it under
-    the terms of the Lesser GNU General Public License as published by
+    the terms of the GNU Lesser General Public License as published by
     the Free Software Foundation; either version 3 of the License, or
     (at your option) any later version.
 
     0MQ is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    Lesser GNU General Public License for more details.
+    GNU Lesser General Public License for more details.
 
-    You should have received a copy of the Lesser GNU General Public License
+    You should have received a copy of the GNU Lesser General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
@@ -35,15 +36,18 @@
 #include <netdb.h>
 #endif
 
+namespace zmq
+{
+    const char *errno_to_string (int errno_);
+}
+
 #ifdef ZMQ_HAVE_WINDOWS
 
 namespace zmq
 {
-
     const char *wsa_error ();
     void win_error (char *buffer_, size_t buffer_size_);
-    void wsa_error_to_errno ();
-  
+    void wsa_error_to_errno (); 
 }
 
 //  Provides convenient way to check WSA-style errors on Windows.
@@ -95,7 +99,7 @@ namespace zmq
         }\
     } while (false)
 
-// Provides convenient way to check for POSIX errors.
+//  Provides convenient way to check for POSIX errors.
 #define posix_assert(x) \
     do {\
         if (unlikely (x)) {\
@@ -104,7 +108,7 @@ namespace zmq
         }\
     } while (false)
 
-// Provides convenient way to check for errors from getaddrinfo.
+//  Provides convenient way to check for errors from getaddrinfo.
 #define gai_assert(x) \
     do {\
         if (unlikely (x)) {\
@@ -114,10 +118,16 @@ namespace zmq
         }\
     } while (false)
 
-#endif
-
-#define zmq_not_implemented() \
+//  Provides convenient way to check whether memory allocation have succeeded.
+#define alloc_assert(x) \
     do {\
-        fprintf (stderr, "Hic sunt leones (%s:%d)\n", __FILE__, __LINE__);\
-        abort ();\
+        if (unlikely (!x)) {\
+            fprintf (stderr, "FATAL ERROR: OUT OF MEMORY (%s:%d)\n",\
+                __FILE__, __LINE__);\
+            abort ();\
+        }\
     } while (false)
+
+#endif
+
+
diff --git a/src/fd.hpp b/src/fd.hpp
index 6ad8252..3b15024 100644
--- a/src/fd.hpp
+++ b/src/fd.hpp
@@ -1,19 +1,20 @@
 /*
-    Copyright (c) 2007-2010 iMatix Corporation
+    Copyright (c) 2007-2011 iMatix Corporation
+    Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
 
     This file is part of 0MQ.
 
     0MQ is free software; you can redistribute it and/or modify it under
-    the terms of the Lesser GNU General Public License as published by
+    the terms of the GNU Lesser General Public License as published by
     the Free Software Foundation; either version 3 of the License, or
     (at your option) any later version.
 
     0MQ is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    Lesser GNU General Public License for more details.
+    GNU Lesser General Public License for more details.
 
-    You should have received a copy of the Lesser GNU General Public License
+    You should have received a copy of the GNU Lesser General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
diff --git a/src/forwarder.cpp b/src/forwarder.cpp
deleted file mode 100644
index d1f324e..0000000
--- a/src/forwarder.cpp
+++ /dev/null
@@ -1,60 +0,0 @@
-/*
-    Copyright (c) 2007-2010 iMatix Corporation
-
-    This file is part of 0MQ.
-
-    0MQ is free software; you can redistribute it and/or modify it under
-    the terms of the Lesser GNU General Public License as published by
-    the Free Software Foundation; either version 3 of the License, or
-    (at your option) any later version.
-
-    0MQ is distributed in the hope that it will be useful,
-    but WITHOUT ANY WARRANTY; without even the implied warranty of
-    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    Lesser GNU General Public License for more details.
-
-    You should have received a copy of the Lesser GNU General Public License
-    along with this program.  If not, see <http://www.gnu.org/licenses/>.
-*/
-
-#include "../include/zmq.h"
-
-#include "forwarder.hpp"
-#include "socket_base.hpp"
-#include "likely.hpp"
-#include "err.hpp"
-
-int zmq::forwarder (socket_base_t *insocket_, socket_base_t *outsocket_)
-{
-    zmq_msg_t msg;
-    int rc = zmq_msg_init (&msg);
-    errno_assert (rc == 0);
-
-    int64_t more;
-    size_t more_sz = sizeof (more);
-
-    while (true) {
-        rc = insocket_->recv (&msg, 0);
-        if (unlikely (rc < 0)) {
-            if (errno == ETERM)
-                return -1;
-            errno_assert (false);
-        }
-
-        rc = insocket_->getsockopt (ZMQ_RCVMORE, &more, &more_sz);
-        if (unlikely (rc < 0)) {
-            if (errno == ETERM)
-                return -1;
-            errno_assert (false);
-        }
-
-        rc = outsocket_->send (&msg, more ? ZMQ_SNDMORE : 0);
-        if (unlikely (rc < 0)) {
-            if (errno == ETERM)
-                return -1;
-            errno_assert (false);
-        }
-    }
-
-    return 0;
-}
diff --git a/src/forwarder.hpp b/src/forwarder.hpp
deleted file mode 100644
index 68827a4..0000000
--- a/src/forwarder.hpp
+++ /dev/null
@@ -1,31 +0,0 @@
-/*
-    Copyright (c) 2007-2010 iMatix Corporation
-
-    This file is part of 0MQ.
-
-    0MQ is free software; you can redistribute it and/or modify it under
-    the terms of the Lesser GNU General Public License as published by
-    the Free Software Foundation; either version 3 of the License, or
-    (at your option) any later version.
-
-    0MQ is distributed in the hope that it will be useful,
-    but WITHOUT ANY WARRANTY; without even the implied warranty of
-    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    Lesser GNU General Public License for more details.
-
-    You should have received a copy of the Lesser GNU General Public License
-    along with this program.  If not, see <http://www.gnu.org/licenses/>.
-*/
-
-#ifndef __ZMQ_FORWARDER_HPP_INCLUDED__
-#define __ZMQ_FORWARDER_HPP_INCLUDED__
-
-namespace zmq
-{
-
-    int forwarder (class socket_base_t *insocket_,
-        class socket_base_t *outsocket_);
-
-}
-
-#endif
diff --git a/src/fq.cpp b/src/fq.cpp
index 9028853..36fd435 100644
--- a/src/fq.cpp
+++ b/src/fq.cpp
@@ -1,19 +1,20 @@
 /*
-    Copyright (c) 2007-2010 iMatix Corporation
+    Copyright (c) 2007-2011 iMatix Corporation
+    Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
 
     This file is part of 0MQ.
 
     0MQ is free software; you can redistribute it and/or modify it under
-    the terms of the Lesser GNU General Public License as published by
+    the terms of the GNU Lesser General Public License as published by
     the Free Software Foundation; either version 3 of the License, or
     (at your option) any later version.
 
     0MQ is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    Lesser GNU General Public License for more details.
+    GNU Lesser General Public License for more details.
 
-    You should have received a copy of the Lesser GNU General Public License
+    You should have received a copy of the GNU Lesser General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
@@ -22,29 +23,42 @@
 #include "fq.hpp"
 #include "pipe.hpp"
 #include "err.hpp"
+#include "own.hpp"
 
-zmq::fq_t::fq_t () :
+zmq::fq_t::fq_t (own_t *sink_) :
     active (0),
     current (0),
-    more (false)
+    more (false),
+    sink (sink_),
+    terminating (false)
 {
 }
 
 zmq::fq_t::~fq_t ()
 {
-    for (pipes_t::size_type i = 0; i != pipes.size (); i++)
-        pipes [i]->term ();
+    zmq_assert (pipes.empty ());
 }
 
 void zmq::fq_t::attach (reader_t *pipe_)
 {
+    pipe_->set_event_sink (this);
+
     pipes.push_back (pipe_);
     pipes.swap (active, pipes.size () - 1);
     active++;
+
+    //  If we are already terminating, ask the pipe to terminate straight away.
+    if (terminating) {
+        sink->register_term_acks (1);
+        pipe_->terminate ();
+    }
 }
 
-void zmq::fq_t::detach (reader_t *pipe_)
+void zmq::fq_t::terminated (reader_t *pipe_)
 {
+    //  TODO: This is a problem with session-initiated termination. It breaks
+    //  message atomicity. However, for socket initiated termination it's
+    //  just fine.
     zmq_assert (!more || pipes [current] != pipe_);
 
     //  Remove the pipe from the list; adjust number of active pipes
@@ -55,18 +69,26 @@ void zmq::fq_t::detach (reader_t *pipe_)
             current = 0;
     }
     pipes.erase (pipe_);
+
+    if (terminating)
+        sink->unregister_term_ack ();
 }
 
-void zmq::fq_t::kill (reader_t *pipe_)
+void zmq::fq_t::delimited (reader_t *pipe_)
 {
-    //  Move the pipe to the list of inactive pipes.
-    active--;
-    if (current == active)
-        current = 0;
-    pipes.swap (pipes.index (pipe_), active);
 }
 
-void zmq::fq_t::revive (reader_t *pipe_)
+void zmq::fq_t::terminate ()
+{
+    zmq_assert (!terminating);
+    terminating = true;
+
+    sink->register_term_acks (pipes.size ());
+    for (pipes_t::size_type i = 0; i != pipes.size (); i++)
+        pipes [i]->terminate ();
+}
+
+void zmq::fq_t::activated (reader_t *pipe_)
 {
     //  Move the pipe to the list of active pipes.
     pipes.swap (pipes.index (pipe_), active);
@@ -84,10 +106,14 @@ int zmq::fq_t::recv (zmq_msg_t *msg_, int flags_)
         //  Try to fetch new message. If we've already read part of the message
         //  subsequent part should be immediately available.
         bool fetched = pipes [current]->read (msg_);
+
+        //  Check the atomicity of the message. If we've already received the
+        //  first part of the message we should get the remaining parts
+        //  without blocking.
         zmq_assert (!(more && !fetched));
 
-        //  Note that when message is not fetched, current pipe is killed and
-        //  replaced by another active pipe. Thus we don't have to increase
+        //  Note that when message is not fetched, current pipe is deactivated
+        //  and replaced by another active pipe. Thus we don't have to increase
         //  the 'current' pointer.
         if (fetched) {
             more = msg_->flags & ZMQ_MSG_MORE;
@@ -98,6 +124,12 @@ int zmq::fq_t::recv (zmq_msg_t *msg_, int flags_)
             }
             return 0;
         }
+        else {
+            active--;
+            pipes.swap (current, active);
+            if (current == active)
+                current = 0;
+        }
     }
 
     //  No message is available. Initialise the output parameter
@@ -120,8 +152,11 @@ bool zmq::fq_t::has_in ()
     for (int count = active; count != 0; count--) {
         if (pipes [current]->check_read ())
             return true;
-        current++;
-        if (current >= active)
+
+        //  Deactivate the pipe.
+        active--;
+        pipes.swap (current, active);
+        if (current == active)
             current = 0;
     }
 
diff --git a/src/fq.hpp b/src/fq.hpp
index 5c699ee..8c6c95c 100644
--- a/src/fq.hpp
+++ b/src/fq.hpp
@@ -1,26 +1,28 @@
 /*
-    Copyright (c) 2007-2010 iMatix Corporation
+    Copyright (c) 2007-2011 iMatix Corporation
+    Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
 
     This file is part of 0MQ.
 
     0MQ is free software; you can redistribute it and/or modify it under
-    the terms of the Lesser GNU General Public License as published by
+    the terms of the GNU Lesser General Public License as published by
     the Free Software Foundation; either version 3 of the License, or
     (at your option) any later version.
 
     0MQ is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    Lesser GNU General Public License for more details.
+    GNU Lesser General Public License for more details.
 
-    You should have received a copy of the Lesser GNU General Public License
+    You should have received a copy of the GNU Lesser General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
 #ifndef __ZMQ_FQ_HPP_INCLUDED__
 #define __ZMQ_FQ_HPP_INCLUDED__
 
-#include "yarray.hpp"
+#include "array.hpp"
+#include "pipe.hpp"
 
 namespace zmq
 {
@@ -28,24 +30,28 @@ namespace zmq
     //  Class manages a set of inbound pipes. On receive it performs fair
     //  queueing (RFC970) so that senders gone berserk won't cause denial of
     //  service for decent senders.
-    class fq_t
+    class fq_t : public i_reader_events
     {
     public:
 
-        fq_t ();
+        fq_t (class own_t *sink_);
         ~fq_t ();
 
-        void attach (class reader_t *pipe_);
-        void detach (class reader_t *pipe_);
-        void kill (class reader_t *pipe_);
-        void revive (class reader_t *pipe_);
+        void attach (reader_t *pipe_);
+        void terminate ();
+
         int recv (zmq_msg_t *msg_, int flags_);
         bool has_in ();
 
+        //  i_reader_events implementation.
+        void activated (reader_t *pipe_);
+        void terminated (reader_t *pipe_);
+        void delimited (reader_t *pipe_);
+
     private:
 
         //  Inbound pipes.
-        typedef yarray_t <class reader_t> pipes_t;
+        typedef array_t <reader_t> pipes_t;
         pipes_t pipes;
 
         //  Number of active pipes. All the active pipes are located at the
@@ -59,8 +65,14 @@ namespace zmq
         //  there are following parts still waiting in the current pipe.
         bool more;
 
+        //  Object to send events to.
+        class own_t *sink;
+
+        //  If true, termination process is already underway.
+        bool terminating;
+
         fq_t (const fq_t&);
-        void operator = (const fq_t&);
+        const fq_t &operator = (const fq_t&);
     };
 
 }
diff --git a/src/i_endpoint.hpp b/src/i_endpoint.hpp
deleted file mode 100644
index 0d14224..0000000
--- a/src/i_endpoint.hpp
+++ /dev/null
@@ -1,43 +0,0 @@
-/*
-    Copyright (c) 2007-2010 iMatix Corporation
-
-    This file is part of 0MQ.
-
-    0MQ is free software; you can redistribute it and/or modify it under
-    the terms of the Lesser GNU General Public License as published by
-    the Free Software Foundation; either version 3 of the License, or
-    (at your option) any later version.
-
-    0MQ is distributed in the hope that it will be useful,
-    but WITHOUT ANY WARRANTY; without even the implied warranty of
-    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    Lesser GNU General Public License for more details.
-
-    You should have received a copy of the Lesser GNU General Public License
-    along with this program.  If not, see <http://www.gnu.org/licenses/>.
-*/
-
-#ifndef __ZMQ_I_ENDPOINT_HPP_INCLUDED__
-#define __ZMQ_I_ENDPOINT_HPP_INCLUDED__
-
-#include "blob.hpp"
-
-namespace zmq
-{
-
-    struct i_endpoint
-    {
-        virtual ~i_endpoint () {}
-
-        virtual void attach_pipes (class reader_t *inpipe_,
-            class writer_t *outpipe_, const blob_t &peer_identity_) = 0;
-        virtual void detach_inpipe (class reader_t *pipe_) = 0;
-        virtual void detach_outpipe (class writer_t *pipe_) = 0;
-        virtual void kill (class reader_t *pipe_) = 0;
-        virtual void revive (class reader_t *pipe_) = 0;
-        virtual void revive (class writer_t *pipe_) = 0;
-    };
-
-}
-
-#endif
diff --git a/src/i_engine.hpp b/src/i_engine.hpp
index ea6b850..7bd4ea6 100644
--- a/src/i_engine.hpp
+++ b/src/i_engine.hpp
@@ -1,27 +1,26 @@
 /*
-    Copyright (c) 2007-2010 iMatix Corporation
+    Copyright (c) 2007-2011 iMatix Corporation
+    Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
 
     This file is part of 0MQ.
 
     0MQ is free software; you can redistribute it and/or modify it under
-    the terms of the Lesser GNU General Public License as published by
+    the terms of the GNU Lesser General Public License as published by
     the Free Software Foundation; either version 3 of the License, or
     (at your option) any later version.
 
     0MQ is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    Lesser GNU General Public License for more details.
+    GNU Lesser General Public License for more details.
 
-    You should have received a copy of the Lesser GNU General Public License
+    You should have received a copy of the GNU Lesser General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
 #ifndef __ZMQ_I_ENGINE_HPP_INCLUDED__
 #define __ZMQ_I_ENGINE_HPP_INCLUDED__
 
-#include <stddef.h>
-
 namespace zmq
 {
 
@@ -30,18 +29,23 @@ namespace zmq
         virtual ~i_engine () {}
 
         //  Plug the engine to the session.
-        virtual void plug (struct i_inout *inout_) = 0;
+        virtual void plug (class io_thread_t *io_thread_,
+            struct i_inout *inout_) = 0;
 
         //  Unplug the engine from the session.
         virtual void unplug () = 0;
 
-        //  This method is called by the session to signalise that there
-        //  are messages to send available.
-        virtual void revive () = 0;
+        //  Terminate and deallocate the engine. Note that 'detached'
+        //  events are not fired on termination.
+        virtual void terminate () = 0;
 
         //  This method is called by the session to signalise that more
         //  messages can be written to the pipe.
-        virtual void resume_input () = 0;
+        virtual void activate_in () = 0;
+
+        //  This method is called by the session to signalise that there
+        //  are messages to send available.
+        virtual void activate_out () = 0;
     };
 
 }
diff --git a/src/i_inout.hpp b/src/i_inout.hpp
index 21d1838..057b46c 100644
--- a/src/i_inout.hpp
+++ b/src/i_inout.hpp
@@ -1,19 +1,20 @@
 /*
-    Copyright (c) 2007-2010 iMatix Corporation
+    Copyright (c) 2007-2011 iMatix Corporation
+    Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
 
     This file is part of 0MQ.
 
     0MQ is free software; you can redistribute it and/or modify it under
-    the terms of the Lesser GNU General Public License as published by
+    the terms of the GNU Lesser General Public License as published by
     the Free Software Foundation; either version 3 of the License, or
     (at your option) any later version.
 
     0MQ is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    Lesser GNU General Public License for more details.
+    GNU Lesser General Public License for more details.
 
-    You should have received a copy of the Lesser GNU General Public License
+    You should have received a copy of the GNU Lesser General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
@@ -31,28 +32,17 @@ namespace zmq
     {
         virtual ~i_inout () {}
 
-        //  Engine asks to get a message to send to the network.
+        //  Engine asks for a message to send to the network.
         virtual bool read (::zmq_msg_t *msg_) = 0;
 
-        //  Engine sends the incoming message further on downstream.
+        //  Engine received message from the network and sends it further on.
         virtual bool write (::zmq_msg_t *msg_) = 0;
 
-        //  Flush all the previously written messages downstream.
+        //  Flush all the previously written messages.
         virtual void flush () = 0;
-    
-        //  Drop all the references to the engine. The parameter is the object
-        //  to use to reconnect. If reconnection is not required, the argument
-        //  is set to NULL.
-        virtual void detach (class owned_t *reconnecter_) = 0;
 
-        //  Returns least loaded I/O thread.
-        virtual class io_thread_t *get_io_thread () = 0;
-
-        //  Return pointer to the owning socket.
-        virtual class socket_base_t *get_owner () = 0;
-
-        //  Return ordinal number of the session.
-        virtual uint64_t get_ordinal () = 0;
+        //  Engine is dead. Drop all the references to it.
+        virtual void detach () = 0;
     };
 
 }
diff --git a/src/i_poll_events.hpp b/src/i_poll_events.hpp
index 6d474b2..fa9fb25 100644
--- a/src/i_poll_events.hpp
+++ b/src/i_poll_events.hpp
@@ -1,20 +1,21 @@
 /*
-Copyright (c) 2007-2010 iMatix Corporation
- 
-This file is part of 0MQ.
- 
-0MQ is free software; you can redistribute it and/or modify it under
-the terms of the Lesser GNU General Public License as published by
-the Free Software Foundation; either version 3 of the License, or
-(at your option) any later version.
- 
-0MQ is distributed in the hope that it will be useful,
-but WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-Lesser GNU General Public License for more details.
- 
-You should have received a copy of the Lesser GNU General Public License
-along with this program. If not, see <http://www.gnu.org/licenses/>.
+    Copyright (c) 2007-2011 iMatix Corporation
+    Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
+
+    This file is part of 0MQ.
+
+    0MQ is free software; you can redistribute it and/or modify it under
+    the terms of the GNU Lesser General Public License as published by
+    the Free Software Foundation; either version 3 of the License, or
+    (at your option) any later version.
+
+    0MQ is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+    GNU Lesser General Public License for more details.
+
+    You should have received a copy of the GNU Lesser General Public License
+    along with this program. If not, see <http://www.gnu.org/licenses/>.
 */
  
 #ifndef __ZMQ_I_POLL_EVENTS_HPP_INCLUDED__
@@ -37,7 +38,7 @@ namespace zmq
         virtual void out_event () = 0;
  
         // Called when timer expires.
-        virtual void timer_event () = 0;
+        virtual void timer_event (int id_) = 0;
     };
  
 }
diff --git a/src/io_object.cpp b/src/io_object.cpp
index 086f173..e68917c 100644
--- a/src/io_object.cpp
+++ b/src/io_object.cpp
@@ -1,19 +1,20 @@
 /*
-    Copyright (c) 2007-2010 iMatix Corporation
+    Copyright (c) 2007-2011 iMatix Corporation
+    Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
 
     This file is part of 0MQ.
 
     0MQ is free software; you can redistribute it and/or modify it under
-    the terms of the Lesser GNU General Public License as published by
+    the terms of the GNU Lesser General Public License as published by
     the Free Software Foundation; either version 3 of the License, or
     (at your option) any later version.
 
     0MQ is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    Lesser GNU General Public License for more details.
+    GNU Lesser General Public License for more details.
 
-    You should have received a copy of the Lesser GNU General Public License
+    You should have received a copy of the GNU Lesser General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
@@ -21,21 +22,35 @@
 #include "io_thread.hpp"
 #include "err.hpp"
 
-zmq::io_object_t::io_object_t (io_thread_t *io_thread_)
+zmq::io_object_t::io_object_t (io_thread_t *io_thread_) :
+    poller (NULL)
 {
-    //  Retrieve the poller from the thread we are running in.
-    poller = io_thread_->get_poller ();
+    if (io_thread_)
+        plug (io_thread_);
 }
 
 zmq::io_object_t::~io_object_t ()
 {
 }
 
-void zmq::io_object_t::set_io_thread (io_thread_t *io_thread_)
+void zmq::io_object_t::plug (io_thread_t *io_thread_)
 {
+    zmq_assert (io_thread_);
+    zmq_assert (!poller);
+
+    //  Retrieve the poller from the thread we are running in.
     poller = io_thread_->get_poller ();
 }
 
+void zmq::io_object_t::unplug ()
+{
+    zmq_assert (poller);
+
+    //  Forget about old poller in preparation to be migrated
+    //  to a different I/O thread.
+    poller = NULL;
+}
+
 zmq::io_object_t::handle_t zmq::io_object_t::add_fd (fd_t fd_)
 {
     return poller->add_fd (fd_, this);
@@ -66,14 +81,14 @@ void zmq::io_object_t::reset_pollout (handle_t handle_)
     poller->reset_pollout (handle_);
 }
 
-void zmq::io_object_t::add_timer ()
+void zmq::io_object_t::add_timer (int timeout_, int id_)
 {
-    poller->add_timer (this);
+    poller->add_timer (timeout_, this, id_);
 }
 
-void zmq::io_object_t::cancel_timer ()
+void zmq::io_object_t::cancel_timer (int id_)
 {
-    poller->cancel_timer (this);
+    poller->cancel_timer (this, id_);
 }
 
 void zmq::io_object_t::in_event ()
@@ -86,7 +101,7 @@ void zmq::io_object_t::out_event ()
     zmq_assert (false);
 }
 
-void zmq::io_object_t::timer_event ()
+void zmq::io_object_t::timer_event (int id_)
 {
     zmq_assert (false);
 }
diff --git a/src/io_object.hpp b/src/io_object.hpp
index 655e7f5..fb0d1e3 100644
--- a/src/io_object.hpp
+++ b/src/io_object.hpp
@@ -1,19 +1,20 @@
 /*
-    Copyright (c) 2007-2010 iMatix Corporation
+    Copyright (c) 2007-2011 iMatix Corporation
+    Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
 
     This file is part of 0MQ.
 
     0MQ is free software; you can redistribute it and/or modify it under
-    the terms of the Lesser GNU General Public License as published by
+    the terms of the GNU Lesser General Public License as published by
     the Free Software Foundation; either version 3 of the License, or
     (at your option) any later version.
 
     0MQ is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    Lesser GNU General Public License for more details.
+    GNU Lesser General Public License for more details.
 
-    You should have received a copy of the Lesser GNU General Public License
+    You should have received a copy of the GNU Lesser General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
@@ -40,15 +41,15 @@ namespace zmq
         io_object_t (class io_thread_t *io_thread_ = NULL);
         ~io_object_t ();
 
+        //  When migrating an object from one I/O thread to another, first
+        //  unplug it, then migrate it, then plug it to the new thread.
+        void plug (class io_thread_t *io_thread_);
+        void unplug ();
+
     protected:
 
         typedef poller_t::handle_t handle_t;
 
-        //  Derived class can init/swap the underlying I/O thread.
-        //  Caution: Remove all the file descriptors from the old I/O thread
-        //  before swapping to the new one!
-        void set_io_thread (class io_thread_t *io_thread_);
-
         //  Methods to access underlying poller object.
         handle_t add_fd (fd_t fd_);
         void rm_fd (handle_t handle_);
@@ -56,20 +57,20 @@ namespace zmq
         void reset_pollin (handle_t handle_);
         void set_pollout (handle_t handle_);
         void reset_pollout (handle_t handle_);
-        void add_timer ();
-        void cancel_timer ();
+        void add_timer (int timout_, int id_);
+        void cancel_timer (int id_);
 
         //  i_poll_events interface implementation.
         void in_event ();
         void out_event ();
-        void timer_event ();
+        void timer_event (int id_);
 
     private:
 
         poller_t *poller;
 
         io_object_t (const io_object_t&);
-        void operator = (const io_object_t&);
+        const io_object_t &operator = (const io_object_t&);
     };
 
 }
diff --git a/src/io_thread.cpp b/src/io_thread.cpp
index fac6961..be52bdd 100644
--- a/src/io_thread.cpp
+++ b/src/io_thread.cpp
@@ -1,19 +1,20 @@
 /*
-    Copyright (c) 2007-2010 iMatix Corporation
+    Copyright (c) 2007-2011 iMatix Corporation
+    Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
 
     This file is part of 0MQ.
 
     0MQ is free software; you can redistribute it and/or modify it under
-    the terms of the Lesser GNU General Public License as published by
+    the terms of the GNU Lesser General Public License as published by
     the Free Software Foundation; either version 3 of the License, or
     (at your option) any later version.
 
     0MQ is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    Lesser GNU General Public License for more details.
+    GNU Lesser General Public License for more details.
 
-    You should have received a copy of the Lesser GNU General Public License
+    You should have received a copy of the GNU Lesser General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
@@ -26,15 +27,14 @@
 #include "err.hpp"
 #include "ctx.hpp"
 
-zmq::io_thread_t::io_thread_t (ctx_t *ctx_,
-      uint32_t thread_slot_) :
-    object_t (ctx_, thread_slot_)
+zmq::io_thread_t::io_thread_t (ctx_t *ctx_, uint32_t tid_) :
+    object_t (ctx_, tid_)
 {
     poller = new (std::nothrow) poller_t;
-    zmq_assert (poller);
+    alloc_assert (poller);
 
-    signaler_handle = poller->add_fd (signaler.get_fd (), this);
-    poller->set_pollin (signaler_handle);
+    mailbox_handle = poller->add_fd (mailbox.get_fd (), this);
+    poller->set_pollin (mailbox_handle);
 }
 
 zmq::io_thread_t::~io_thread_t ()
@@ -53,9 +53,9 @@ void zmq::io_thread_t::stop ()
     send_stop ();
 }
 
-zmq::signaler_t *zmq::io_thread_t::get_signaler ()
+zmq::mailbox_t *zmq::io_thread_t::get_mailbox ()
 {
-    return &signaler;
+    return &mailbox;
 }
 
 int zmq::io_thread_t::get_load ()
@@ -72,8 +72,12 @@ void zmq::io_thread_t::in_event ()
 
         //  Get the next command. If there is none, exit.
         command_t cmd;
-        if (!signaler.recv (&cmd, false))
+        int rc = mailbox.recv (&cmd, false);
+        if (rc != 0 && errno == EINTR)
+            continue;
+        if (rc != 0 && errno == EAGAIN)
             break;
+        errno_assert (rc == 0);
 
         //  Process the command.
         cmd.destination->process_command (cmd);
@@ -86,7 +90,7 @@ void zmq::io_thread_t::out_event ()
     zmq_assert (false);
 }
 
-void zmq::io_thread_t::timer_event ()
+void zmq::io_thread_t::timer_event (int id_)
 {
     //  No timers here. This function is never called.
     zmq_assert (false);
@@ -100,6 +104,6 @@ zmq::poller_t *zmq::io_thread_t::get_poller ()
 
 void zmq::io_thread_t::process_stop ()
 {
-    poller->rm_fd (signaler_handle);
+    poller->rm_fd (mailbox_handle);
     poller->stop ();
 }
diff --git a/src/io_thread.hpp b/src/io_thread.hpp
index 3d832c0..f578d4e 100644
--- a/src/io_thread.hpp
+++ b/src/io_thread.hpp
@@ -1,19 +1,20 @@
 /*
-    Copyright (c) 2007-2010 iMatix Corporation
+    Copyright (c) 2007-2011 iMatix Corporation
+    Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
 
     This file is part of 0MQ.
 
     0MQ is free software; you can redistribute it and/or modify it under
-    the terms of the Lesser GNU General Public License as published by
+    the terms of the GNU Lesser General Public License as published by
     the Free Software Foundation; either version 3 of the License, or
     (at your option) any later version.
 
     0MQ is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    Lesser GNU General Public License for more details.
+    GNU Lesser General Public License for more details.
 
-    You should have received a copy of the Lesser GNU General Public License
+    You should have received a copy of the GNU Lesser General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
@@ -26,7 +27,7 @@
 #include "object.hpp"
 #include "poller.hpp"
 #include "i_poll_events.hpp"
-#include "signaler.hpp"
+#include "mailbox.hpp"
 
 namespace zmq
 {
@@ -38,7 +39,7 @@ namespace zmq
     {
     public:
 
-        io_thread_t (class ctx_t *ctx_, uint32_t thread_slot_);
+        io_thread_t (class ctx_t *ctx_, uint32_t tid_);
 
         //  Clean-up. If the thread was started, it's neccessary to call 'stop'
         //  before invoking destructor. Otherwise the destructor would hang up.
@@ -50,13 +51,13 @@ namespace zmq
         //  Ask underlying thread to stop.
         void stop ();
 
-        //  Returns signaler associated with this I/O thread.
-        signaler_t *get_signaler ();
+        //  Returns mailbox associated with this I/O thread.
+        mailbox_t *get_mailbox ();
 
         //  i_poll_events implementation.
         void in_event ();
         void out_event ();
-        void timer_event ();
+        void timer_event (int id_);
 
         //  Used by io_objects to retrieve the assciated poller object.
         poller_t *get_poller ();
@@ -69,15 +70,17 @@ namespace zmq
 
     private:
 
-        //  Poll thread gets notifications about incoming commands using
-        //  this signaler.
-        signaler_t signaler;
+        //  I/O thread accesses incoming commands via this mailbox.
+        mailbox_t mailbox;
 
-        //  Handle associated with signaler's file descriptor.
-        poller_t::handle_t signaler_handle;
+        //  Handle associated with mailbox' file descriptor.
+        poller_t::handle_t mailbox_handle;
 
         //  I/O multiplexing is performed using a poller object.
         poller_t *poller;
+
+        io_thread_t (const io_thread_t&);
+        const io_thread_t &operator = (const io_thread_t&);
     };
 
 }
diff --git a/src/ip.cpp b/src/ip.cpp
index f491008..a63a97d 100644
--- a/src/ip.cpp
+++ b/src/ip.cpp
@@ -1,19 +1,20 @@
 /*
-    Copyright (c) 2007-2010 iMatix Corporation
+    Copyright (c) 2007-2011 iMatix Corporation
+    Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
 
     This file is part of 0MQ.
 
     0MQ is free software; you can redistribute it and/or modify it under
-    the terms of the Lesser GNU General Public License as published by
+    the terms of the GNU Lesser General Public License as published by
     the Free Software Foundation; either version 3 of the License, or
     (at your option) any later version.
 
     0MQ is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    Lesser GNU General Public License for more details.
+    GNU Lesser General Public License for more details.
 
-    You should have received a copy of the Lesser GNU General Public License
+    You should have received a copy of the GNU Lesser General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
@@ -22,6 +23,8 @@
 #include <stdlib.h>
 #include <string>
 
+#include "../include/zmq.h"
+
 #include "ip.hpp"
 #include "platform.hpp"
 #include "err.hpp"
@@ -50,7 +53,7 @@ static int resolve_nic_name (in_addr* addr_, char const *interface_)
     //  Allocate memory to get interface names.
     size_t ifr_size = sizeof (struct lifreq) * ifn.lifn_count;
     char *ifr = (char*) malloc (ifr_size);
-    errno_assert (ifr);
+    alloc_assert (ifr);
     
     //  Retrieve interface names.
     lifconf ifc;
@@ -228,10 +231,13 @@ int zmq::resolve_ip_interface (sockaddr_storage* addr_, socklen_t *addr_len_,
     }
 
     //  There's no such interface name. Assume literal address.
+#if defined ZMQ_HAVE_OPENVMS && defined __ia64
+    __addrinfo64 *res = NULL;
+    __addrinfo64 req;
+#else
     addrinfo *res = NULL;
-
-    //  Set up the query.
     addrinfo req;
+#endif
     memset (&req, 0, sizeof (req));
 
     //  We only support IPv4 addresses for now.
@@ -311,11 +317,13 @@ int zmq::resolve_ip_hostname (sockaddr_storage *addr_, socklen_t *addr_len_,
     return 0;
 }
 
-#if !defined ZMQ_HAVE_WINDOWS && !defined ZMQ_HAVE_OPENVMS
-
 int zmq::resolve_local_path (sockaddr_storage *addr_, socklen_t *addr_len_,
     const char *path_)
 {
+#if defined ZMQ_HAVE_WINDOWS || defined ZMQ_HAVE_OPENVMS
+    errno = EPROTONOSUPPORT;
+    return -1;
+#else
     sockaddr_un *un = (sockaddr_un*) addr_;
     if (strlen (path_) >= sizeof (un->sun_path))
     {
@@ -326,7 +334,6 @@ int zmq::resolve_local_path (sockaddr_storage *addr_, socklen_t *addr_len_,
     un->sun_family = AF_UNIX;
     *addr_len_ = sizeof (sockaddr_un);
     return 0;
-}
-
 #endif
+}
 
diff --git a/src/ip.hpp b/src/ip.hpp
index d963df2..ec2db43 100644
--- a/src/ip.hpp
+++ b/src/ip.hpp
@@ -1,19 +1,20 @@
 /*
-    Copyright (c) 2007-2010 iMatix Corporation
+    Copyright (c) 2007-2011 iMatix Corporation
+    Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
 
     This file is part of 0MQ.
 
     0MQ is free software; you can redistribute it and/or modify it under
-    the terms of the Lesser GNU General Public License as published by
+    the terms of the GNU Lesser General Public License as published by
     the Free Software Foundation; either version 3 of the License, or
     (at your option) any later version.
 
     0MQ is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    Lesser GNU General Public License for more details.
+    GNU Lesser General Public License for more details.
 
-    You should have received a copy of the Lesser GNU General Public License
+    You should have received a copy of the GNU Lesser General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
@@ -59,11 +60,9 @@ namespace zmq
     int resolve_ip_hostname (sockaddr_storage *addr_, socklen_t *addr_len_,
         const char *hostname_);
 
-#if !defined ZMQ_HAVE_WINDOWS && !defined ZMQ_HAVE_OPENVMS
     // This function sets up address for UNIX domain transport.
     int resolve_local_path (sockaddr_storage *addr_, socklen_t *addr_len_,
         const char* pathname_);
-#endif
 }
 
 #endif 
diff --git a/src/kqueue.cpp b/src/kqueue.cpp
index e1fe2fa..e28ecd7 100644
--- a/src/kqueue.cpp
+++ b/src/kqueue.cpp
@@ -1,19 +1,20 @@
 /*
-    Copyright (c) 2007-2010 iMatix Corporation
+    Copyright (c) 2007-2011 iMatix Corporation
+    Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
 
     This file is part of 0MQ.
 
     0MQ is free software; you can redistribute it and/or modify it under
-    the terms of the Lesser GNU General Public License as published by
+    the terms of the GNU Lesser General Public License as published by
     the Free Software Foundation; either version 3 of the License, or
     (at your option) any later version.
 
     0MQ is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    Lesser GNU General Public License for more details.
+    GNU Lesser General Public License for more details.
 
-    You should have received a copy of the Lesser GNU General Public License
+    You should have received a copy of the GNU Lesser General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
@@ -54,10 +55,6 @@ zmq::kqueue_t::kqueue_t () :
 zmq::kqueue_t::~kqueue_t ()
 {
     worker.stop ();
-
-    //  Make sure there are no fds registered on shutdown.
-    zmq_assert (load.get () == 0);
-
     close (kqueue_fd);
 }
 
@@ -74,7 +71,7 @@ void zmq::kqueue_t::kevent_delete (fd_t fd_, short filter_)
 {
     struct kevent ev;
 
-    EV_SET (&ev, fd_, filter_, EV_DELETE, 0, 0, (kevent_udata_t)NULL);
+    EV_SET (&ev, fd_, filter_, EV_DELETE, 0, 0, 0);
     int rc = kevent (kqueue_fd, &ev, 1, NULL, 0, NULL);
     errno_assert (rc != -1);
 }
@@ -83,13 +80,15 @@ zmq::kqueue_t::handle_t zmq::kqueue_t::add_fd (fd_t fd_,
     i_poll_events *reactor_)
 {
     poll_entry_t *pe = new (std::nothrow) poll_entry_t;
-    zmq_assert (pe != NULL);
+    alloc_assert (pe);
 
     pe->fd = fd_;
     pe->flag_pollin = 0;
     pe->flag_pollout = 0;
     pe->reactor = reactor_;
 
+    adjust_load (1);
+
     return pe;
 }
 
@@ -102,6 +101,8 @@ void zmq::kqueue_t::rm_fd (handle_t handle_)
         kevent_delete (pe->fd, EVFILT_WRITE);
     pe->fd = retired_fd;
     retired.push_back (pe);
+
+    adjust_load (-1);
 }
 
 void zmq::kqueue_t::set_pollin (handle_t handle_)
@@ -132,23 +133,6 @@ void zmq::kqueue_t::reset_pollout (handle_t handle_)
     kevent_delete (pe->fd, EVFILT_WRITE);
 }
 
-void zmq::kqueue_t::add_timer (i_poll_events *events_)
-{
-     timers.push_back (events_);
-}
-
-void zmq::kqueue_t::cancel_timer (i_poll_events *events_)
-{
-    timers_t::iterator it = std::find (timers.begin (), timers.end (), events_);
-    if (it != timers.end ())
-        timers.erase (it);
-}
-
-int zmq::kqueue_t::get_load ()
-{
-    return load.get ();
-}
-
 void zmq::kqueue_t::start ()
 {
     worker.start (worker_routine, this);
@@ -163,34 +147,18 @@ void zmq::kqueue_t::loop ()
 {
     while (!stopping) {
 
-        struct kevent ev_buf [max_io_events];
-
-        //  Compute time interval to wait.
-        timespec timeout = {max_timer_period / 1000,
-            (max_timer_period % 1000) * 1000000};
+        //  Execute any due timers.
+        int timeout = (int) execute_timers ();
 
         //  Wait for events.
-        int n = kevent (kqueue_fd, NULL, 0,
-             &ev_buf [0], max_io_events, timers.empty () ? NULL : &timeout);
+        struct kevent ev_buf [max_io_events];
+        timespec ts = {timeout / 1000, (timeout % 1000) * 1000000};
+        int n = kevent (kqueue_fd, NULL, 0, &ev_buf [0], max_io_events,
+            timeout ? &ts: NULL);
         if (n == -1 && errno == EINTR)
             continue;
         errno_assert (n != -1);
 
-        //  Handle timer.
-        if (!n) {
-
-            //  Use local list of timers as timer handlers may fill new timers
-            //  into the original array.
-            timers_t t;
-            std::swap (timers, t);
-
-            //  Trigger all the timers.
-            for (timers_t::iterator it = t.begin (); it != t.end (); it ++)
-                (*it)->timer_event ();
-
-            continue;
-        }
-
         for (int i = 0; i < n; i ++) {
             poll_entry_t *pe = (poll_entry_t*) ev_buf [i].udata;
 
@@ -210,7 +178,7 @@ void zmq::kqueue_t::loop ()
 
         //  Destroy retired event sources.
         for (retired_t::iterator it = retired.begin (); it != retired.end ();
-              it ++)
+              ++it)
             delete *it;
         retired.clear ();
     }
diff --git a/src/kqueue.hpp b/src/kqueue.hpp
index ac28a7d..d564c7c 100644
--- a/src/kqueue.hpp
+++ b/src/kqueue.hpp
@@ -1,19 +1,20 @@
 /*
-    Copyright (c) 2007-2010 iMatix Corporation
+    Copyright (c) 2007-2011 iMatix Corporation
+    Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
 
     This file is part of 0MQ.
 
     0MQ is free software; you can redistribute it and/or modify it under
-    the terms of the Lesser GNU General Public License as published by
+    the terms of the GNU Lesser General Public License as published by
     the Free Software Foundation; either version 3 of the License, or
     (at your option) any later version.
 
     0MQ is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    Lesser GNU General Public License for more details.
+    GNU Lesser General Public License for more details.
 
-    You should have received a copy of the Lesser GNU General Public License
+    You should have received a copy of the GNU Lesser General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
@@ -29,7 +30,7 @@
 
 #include "fd.hpp"
 #include "thread.hpp"
-#include "atomic_counter.hpp"
+#include "poller_base.hpp"
 
 namespace zmq
 {
@@ -37,7 +38,7 @@ namespace zmq
     //  Implements socket polling mechanism using the BSD-specific
     //  kqueue interface.
 
-    class kqueue_t
+    class kqueue_t : public poller_base_t
     {
     public:
 
@@ -53,9 +54,6 @@ namespace zmq
         void reset_pollin (handle_t handle_);
         void set_pollout (handle_t handle_);
         void reset_pollout (handle_t handle_);
-        void add_timer (struct i_poll_events *events_);
-        void cancel_timer (struct i_poll_events *events_);
-        int get_load ();
         void start ();
         void stop ();
 
@@ -88,22 +86,14 @@ namespace zmq
         typedef std::vector <poll_entry_t*> retired_t;
         retired_t retired;
 
-        //  List of all the engines waiting for the timer event.
-        typedef std::vector <struct i_poll_events*> timers_t;
-        timers_t timers;
-
         //  If true, thread is in the process of shutting down.
         bool stopping;
 
         //  Handle of the physical thread doing the I/O work.
         thread_t worker;
 
-        //  Load of the poller. Currently number of file descriptors
-        //  registered with the poller.
-        atomic_counter_t load;
-
         kqueue_t (const kqueue_t&);
-        void operator = (const kqueue_t&);
+        const kqueue_t &operator = (const kqueue_t&);
     };
 
 }
diff --git a/src/lb.cpp b/src/lb.cpp
index ca93ba2..95af4a1 100644
--- a/src/lb.cpp
+++ b/src/lb.cpp
@@ -1,19 +1,20 @@
 /*
-    Copyright (c) 2007-2010 iMatix Corporation
+    Copyright (c) 2007-2011 iMatix Corporation
+    Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
 
     This file is part of 0MQ.
 
     0MQ is free software; you can redistribute it and/or modify it under
-    the terms of the Lesser GNU General Public License as published by
+    the terms of the GNU Lesser General Public License as published by
     the Free Software Foundation; either version 3 of the License, or
     (at your option) any later version.
 
     0MQ is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    Lesser GNU General Public License for more details.
+    GNU Lesser General Public License for more details.
 
-    You should have received a copy of the Lesser GNU General Public License
+    You should have received a copy of the GNU Lesser General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
@@ -22,42 +23,70 @@
 #include "lb.hpp"
 #include "pipe.hpp"
 #include "err.hpp"
+#include "own.hpp"
 
-zmq::lb_t::lb_t () :
+zmq::lb_t::lb_t (own_t *sink_) :
     active (0),
     current (0),
-    more (false)
+    more (false),
+    dropping (false),
+    sink (sink_),
+    terminating (false)
 {
 }
 
 zmq::lb_t::~lb_t ()
 {
-    for (pipes_t::size_type i = 0; i != pipes.size (); i++)
-        pipes [i]->term ();
+    zmq_assert (pipes.empty ());
 }
 
 void zmq::lb_t::attach (writer_t *pipe_)
 {
+    pipe_->set_event_sink (this);
+
     pipes.push_back (pipe_);
     pipes.swap (active, pipes.size () - 1);
     active++;
+
+    if (terminating) {
+        sink->register_term_acks (1);
+        pipe_->terminate ();
+    }
+}
+
+void zmq::lb_t::terminate ()
+{
+    zmq_assert (!terminating);
+    terminating = true;
+
+    sink->register_term_acks (pipes.size ());
+    for (pipes_t::size_type i = 0; i != pipes.size (); i++)
+        pipes [i]->terminate ();
 }
 
-void zmq::lb_t::detach (writer_t *pipe_)
+void zmq::lb_t::terminated (writer_t *pipe_)
 {
-    zmq_assert (!more || pipes [current] != pipe_);
+    pipes_t::size_type index = pipes.index (pipe_);
+
+    //  If we are in the middle of multipart message and current pipe
+    //  have disconnected, we have to drop the remainder of the message.
+    if (index == current && more)
+        dropping = true;
 
     //  Remove the pipe from the list; adjust number of active pipes
     //  accordingly.
-    if (pipes.index (pipe_) < active) {
+    if (index < active) {
         active--;
         if (current == active)
             current = 0;
     }
     pipes.erase (pipe_);
+
+    if (terminating)
+        sink->unregister_term_ack ();
 }
 
-void zmq::lb_t::revive (writer_t *pipe_)
+void zmq::lb_t::activated (writer_t *pipe_)
 {
     //  Move the pipe to the list of active pipes.
     pipes.swap (pipes.index (pipe_), active);
@@ -66,6 +95,21 @@ void zmq::lb_t::revive (writer_t *pipe_)
 
 int zmq::lb_t::send (zmq_msg_t *msg_, int flags_)
 {
+    //  Drop the message if required. If we are at the end of the message
+    //  switch back to non-dropping mode.
+    if (dropping) {
+
+        more = msg_->flags & ZMQ_MSG_MORE;
+        if (!more)
+            dropping = false;
+
+        int rc = zmq_msg_close (msg_);
+        errno_assert (rc == 0);
+        rc = zmq_msg_init (msg_);
+        zmq_assert (rc == 0);
+        return 0;
+    }
+
     while (active > 0) {
         if (pipes [current]->write (msg_)) {
             more = msg_->flags & ZMQ_MSG_MORE;
@@ -108,13 +152,20 @@ bool zmq::lb_t::has_out ()
         return true;
 
     while (active > 0) {
-        if (pipes [current]->check_write ())
+
+        //  Check whether zero-sized message can be written to the pipe.
+        zmq_msg_t msg;
+        zmq_msg_init (&msg);
+        if (pipes [current]->check_write (&msg)) {
+            zmq_msg_close (&msg);
             return true;
+        }
+        zmq_msg_close (&msg);
 
+        //  Deactivate the pipe.
         active--;
-        if (current < active)
-            pipes.swap (current, active);
-        else
+        pipes.swap (current, active);
+        if (current == active)
             current = 0;
     }
 
diff --git a/src/lb.hpp b/src/lb.hpp
index 526a727..0dc11e2 100644
--- a/src/lb.hpp
+++ b/src/lb.hpp
@@ -1,49 +1,54 @@
 /*
-    Copyright (c) 2007-2010 iMatix Corporation
+    Copyright (c) 2007-2011 iMatix Corporation
+    Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
 
     This file is part of 0MQ.
 
     0MQ is free software; you can redistribute it and/or modify it under
-    the terms of the Lesser GNU General Public License as published by
+    the terms of the GNU Lesser General Public License as published by
     the Free Software Foundation; either version 3 of the License, or
     (at your option) any later version.
 
     0MQ is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    Lesser GNU General Public License for more details.
+    GNU Lesser General Public License for more details.
 
-    You should have received a copy of the Lesser GNU General Public License
+    You should have received a copy of the GNU Lesser General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
 #ifndef __ZMQ_LB_HPP_INCLUDED__
 #define __ZMQ_LB_HPP_INCLUDED__
 
-#include "yarray.hpp"
+#include "array.hpp"
+#include "pipe.hpp"
 
 namespace zmq
 {
 
     //  Class manages a set of outbound pipes. On send it load balances
     //  messages fairly among the pipes.
-    class lb_t
+    class lb_t : public i_writer_events
     {
     public:
 
-        lb_t ();
+        lb_t (class own_t *sink_);
         ~lb_t ();
 
-        void attach (class writer_t *pipe_);
-        void detach (class writer_t *pipe_);
-        void revive (class writer_t *pipe_);
+        void attach (writer_t *pipe_);
+        void terminate ();
         int send (zmq_msg_t *msg_, int flags_);
         bool has_out ();
 
+        //  i_writer_events interface implementation.
+        void activated (writer_t *pipe_);
+        void terminated (writer_t *pipe_);
+
     private:
 
         //  List of outbound pipes.
-        typedef yarray_t <class writer_t> pipes_t;
+        typedef array_t <class writer_t> pipes_t;
         pipes_t pipes;
 
         //  Number of active pipes. All the active pipes are located at the
@@ -56,8 +61,17 @@ namespace zmq
         //  True if last we are in the middle of a multipart message.
         bool more;
 
+        //  True if we are dropping current message.
+        bool dropping;
+
+        //  Object to send events to.
+        class own_t *sink;
+
+        //  If true, termination process is already underway.
+        bool terminating;
+
         lb_t (const lb_t&);
-        void operator = (const lb_t&);
+        const lb_t &operator = (const lb_t&);
     };
 
 }
diff --git a/src/likely.hpp b/src/likely.hpp
index b7a8171..a524a50 100644
--- a/src/likely.hpp
+++ b/src/likely.hpp
@@ -1,19 +1,20 @@
 /*
-    Copyright (c) 2007-2010 iMatix Corporation
+    Copyright (c) 2007-2011 iMatix Corporation
+    Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
 
     This file is part of 0MQ.
 
     0MQ is free software; you can redistribute it and/or modify it under
-    the terms of the Lesser GNU General Public License as published by
+    the terms of the GNU Lesser General Public License as published by
     the Free Software Foundation; either version 3 of the License, or
     (at your option) any later version.
 
     0MQ is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    Lesser GNU General Public License for more details.
+    GNU Lesser General Public License for more details.
 
-    You should have received a copy of the Lesser GNU General Public License
+    You should have received a copy of the GNU Lesser General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
diff --git a/src/mailbox.cpp b/src/mailbox.cpp
new file mode 100644
index 0000000..221396b
--- /dev/null
+++ b/src/mailbox.cpp
@@ -0,0 +1,382 @@
+/*
+    Copyright (c) 2007-2011 iMatix Corporation
+    Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
+
+    This file is part of 0MQ.
+
+    0MQ is free software; you can redistribute it and/or modify it under
+    the terms of the GNU Lesser General Public License as published by
+    the Free Software Foundation; either version 3 of the License, or
+    (at your option) any later version.
+
+    0MQ is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU Lesser General Public License for more details.
+
+    You should have received a copy of the GNU Lesser General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "mailbox.hpp"
+#include "platform.hpp"
+#include "err.hpp"
+#include "fd.hpp"
+#include "ip.hpp"
+
+#if defined ZMQ_HAVE_WINDOWS
+#include "windows.hpp"
+#else
+#include <unistd.h>
+#include <fcntl.h>
+#include <limits.h>
+#include <netinet/tcp.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#endif
+
+zmq::fd_t zmq::mailbox_t::get_fd ()
+{
+    return r;
+}
+
+#if defined ZMQ_HAVE_WINDOWS
+
+zmq::mailbox_t::mailbox_t ()
+{
+    //  Create the socketpair for signalling.
+    int rc = make_socketpair (&r, &w);
+    errno_assert (rc == 0);
+
+    //  Set the writer to non-blocking mode.
+    unsigned long argp = 1;
+    rc = ioctlsocket (w, FIONBIO, &argp);
+    wsa_assert (rc != SOCKET_ERROR);
+
+    //  Set the reader to non-blocking mode.
+    argp = 1;
+    rc = ioctlsocket (r, FIONBIO, &argp);
+    wsa_assert (rc != SOCKET_ERROR);
+}
+
+zmq::mailbox_t::~mailbox_t ()
+{
+    int rc = closesocket (w);
+    wsa_assert (rc != SOCKET_ERROR);
+
+    rc = closesocket (r);
+    wsa_assert (rc != SOCKET_ERROR);
+}
+
+void zmq::mailbox_t::send (const command_t &cmd_)
+{
+    //  TODO: Implement SNDBUF auto-resizing as for POSIX platforms.
+    //  In the mean time, the following code with assert if the send()
+    //  call would block.
+    int nbytes = ::send (w, (char *)&cmd_, sizeof (command_t), 0);
+    wsa_assert (nbytes != SOCKET_ERROR);
+    zmq_assert (nbytes == sizeof (command_t));
+}
+
+int zmq::mailbox_t::recv (command_t *cmd_, bool block_)
+{
+    //  If required, set the reader to blocking mode.
+    if (block_) {
+        unsigned long argp = 0;
+        int rc = ioctlsocket (r, FIONBIO, &argp);
+        wsa_assert (rc != SOCKET_ERROR);
+    }
+
+    //  Attempt to read an entire command. Returns EAGAIN if non-blocking
+    //  and a command is not available. Save value of errno if we wish to pass
+    //  it to caller.
+    int err = 0;
+    int nbytes = ::recv (r, (char *)cmd_, sizeof (command_t), 0);
+    if (nbytes == -1 && WSAGetLastError () == WSAEWOULDBLOCK)
+        err = EAGAIN;
+
+    //  Re-set the reader to non-blocking mode.
+    if (block_) {
+        unsigned long argp = 1;
+        int rc = ioctlsocket (r, FIONBIO, &argp);
+        wsa_assert (rc != SOCKET_ERROR);
+    }
+
+    //  If the recv failed, return with the saved errno.
+    if (err != 0) {
+        errno = err;
+        return -1;
+    }
+
+    //  Sanity check for success.
+    wsa_assert (nbytes != SOCKET_ERROR);
+
+    //  Check whether we haven't got half of command.
+    zmq_assert (nbytes == sizeof (command_t));
+
+    return 0;
+}
+
+#else
+
+zmq::mailbox_t::mailbox_t ()
+{
+#ifdef PIPE_BUF
+    //  Make sure that command can be written to the socket in atomic fashion.
+    //  If this wasn't guaranteed, commands from different threads would be
+    //  interleaved.
+    zmq_assert (sizeof (command_t) <= PIPE_BUF);
+#endif
+
+    //  Create the socketpair for signaling.
+    int rc = make_socketpair (&r, &w);
+    errno_assert (rc == 0);
+
+    //  Set the writer to non-blocking mode.
+    int flags = fcntl (w, F_GETFL, 0);
+    errno_assert (flags >= 0);
+    rc = fcntl (w, F_SETFL, flags | O_NONBLOCK);
+    errno_assert (rc == 0);
+
+#ifndef MSG_DONTWAIT
+    //  Set the reader to non-blocking mode.
+    flags = fcntl (r, F_GETFL, 0);
+    errno_assert (flags >= 0);
+    rc = fcntl (r, F_SETFL, flags | O_NONBLOCK);
+    errno_assert (rc == 0);
+#endif
+}
+
+zmq::mailbox_t::~mailbox_t ()
+{
+    close (w);
+    close (r);
+}
+
+void zmq::mailbox_t::send (const command_t &cmd_)
+{
+    //  Attempt to write an entire command without blocking.
+    ssize_t nbytes;
+    do {
+        nbytes = ::send (w, &cmd_, sizeof (command_t), 0);
+    } while (nbytes == -1 && errno == EINTR);
+
+    //  Attempt to increase mailbox SNDBUF if the send failed.
+    if (nbytes == -1 && errno == EAGAIN) {
+        int old_sndbuf, new_sndbuf;
+        socklen_t sndbuf_size = sizeof old_sndbuf;
+
+        //  Retrieve current send buffer size.
+        int rc = getsockopt (w, SOL_SOCKET, SO_SNDBUF, &old_sndbuf,
+            &sndbuf_size);
+        errno_assert (rc == 0);
+        new_sndbuf = old_sndbuf * 2;
+
+        //  Double the new send buffer size.
+        rc = setsockopt (w, SOL_SOCKET, SO_SNDBUF, &new_sndbuf, sndbuf_size);
+        errno_assert (rc == 0);
+
+        //  Verify that the OS actually honored the request.
+        rc = getsockopt (w, SOL_SOCKET, SO_SNDBUF, &new_sndbuf, &sndbuf_size);
+        errno_assert (rc == 0);
+        zmq_assert (new_sndbuf > old_sndbuf);
+
+        //  Retry the sending operation; at this point it must succeed.
+        do {
+            nbytes = ::send (w, &cmd_, sizeof (command_t), 0);
+        } while (nbytes == -1 && errno == EINTR);
+    }
+    errno_assert (nbytes != -1);
+
+    //  This should never happen as we've already checked that command size is
+    //  less than PIPE_BUF.
+    zmq_assert (nbytes == sizeof (command_t));
+}
+
+int zmq::mailbox_t::recv (command_t *cmd_, bool block_)
+{
+#ifdef MSG_DONTWAIT
+
+    //  Attempt to read an entire command. Returns EAGAIN if non-blocking
+    //  mode is requested and a command is not available.
+    ssize_t nbytes = ::recv (r, cmd_, sizeof (command_t),
+        block_ ? 0 : MSG_DONTWAIT);
+    if (nbytes == -1 && (errno == EAGAIN || errno == EINTR))
+        return -1;
+#else
+
+    //  If required, set the reader to blocking mode.
+    if (block_) {
+        int flags = fcntl (r, F_GETFL, 0);
+        errno_assert (flags >= 0);
+        int rc = fcntl (r, F_SETFL, flags & ~O_NONBLOCK);
+        errno_assert (rc == 0);
+    }
+
+    //  Attempt to read an entire command. Returns EAGAIN if non-blocking
+    //  and a command is not available. Save value of errno if we wish to pass
+    //  it to caller.
+    int err = 0;
+    ssize_t nbytes = ::recv (r, cmd_, sizeof (command_t), 0);
+    if (nbytes == -1 && (errno == EAGAIN || errno == EINTR))  
+        err = errno;
+
+    //  Re-set the reader to non-blocking mode.
+    if (block_) {
+        int flags = fcntl (r, F_GETFL, 0);
+        errno_assert (flags >= 0);
+        int rc = fcntl (r, F_SETFL, flags | O_NONBLOCK);
+        errno_assert (rc == 0);
+    }
+
+    //  If the recv failed, return with the saved errno if set.
+    if (err != 0) {
+        errno = err;
+        return -1;
+    }
+
+#endif
+
+    //  Sanity check for success.
+    errno_assert (nbytes != -1);
+
+    //  Check whether we haven't got half of command.
+    zmq_assert (nbytes == sizeof (command_t));
+
+    return 0;
+}
+
+#endif
+
+int zmq::mailbox_t::make_socketpair (fd_t *r_, fd_t *w_)
+{
+#if defined ZMQ_HAVE_WINDOWS
+
+    //  Windows has no 'socketpair' function. CreatePipe is no good as pipe
+    //  handles cannot be polled on. Here we create the socketpair by hand.
+    *w_ = INVALID_SOCKET;
+    *r_ = INVALID_SOCKET;
+
+    //  Create listening socket.
+    SOCKET listener;
+    listener = socket (AF_INET, SOCK_STREAM, 0);
+    wsa_assert (listener != INVALID_SOCKET);
+
+    //  Set SO_REUSEADDR and TCP_NODELAY on listening socket.
+    BOOL so_reuseaddr = 1;
+    int rc = setsockopt (listener, SOL_SOCKET, SO_REUSEADDR,
+        (char *)&so_reuseaddr, sizeof (so_reuseaddr));
+    wsa_assert (rc != SOCKET_ERROR);
+    BOOL tcp_nodelay = 1;
+    rc = setsockopt (listener, IPPROTO_TCP, TCP_NODELAY,
+        (char *)&tcp_nodelay, sizeof (tcp_nodelay));
+    wsa_assert (rc != SOCKET_ERROR);
+
+    //  Bind listening socket to any free local port.
+    struct sockaddr_in addr;
+    memset (&addr, 0, sizeof (addr));
+    addr.sin_family = AF_INET;
+    addr.sin_addr.s_addr = htonl (INADDR_LOOPBACK);
+    addr.sin_port = 0;
+    rc = bind (listener, (const struct sockaddr*) &addr, sizeof (addr));
+    wsa_assert (rc != SOCKET_ERROR);
+
+    //  Retrieve local port listener is bound to (into addr).
+    int addrlen = sizeof (addr);
+    rc = getsockname (listener, (struct sockaddr*) &addr, &addrlen);
+    wsa_assert (rc != SOCKET_ERROR);
+
+    //  Listen for incomming connections.
+    rc = listen (listener, 1);
+    wsa_assert (rc != SOCKET_ERROR);
+
+    //  Create the writer socket.
+    *w_ = WSASocket (AF_INET, SOCK_STREAM, 0, NULL, 0,  0);
+    wsa_assert (*w_ != INVALID_SOCKET);
+
+    //  Set TCP_NODELAY on writer socket.
+    rc = setsockopt (*w_, IPPROTO_TCP, TCP_NODELAY,
+        (char *)&tcp_nodelay, sizeof (tcp_nodelay));
+    wsa_assert (rc != SOCKET_ERROR);
+
+    //  Connect writer to the listener.
+    rc = connect (*w_, (sockaddr *) &addr, sizeof (addr));
+    wsa_assert (rc != SOCKET_ERROR);
+
+    //  Accept connection from writer.
+    *r_ = accept (listener, NULL, NULL);
+    wsa_assert (*r_ != INVALID_SOCKET);
+
+    //  We don't need the listening socket anymore. Close it.
+    rc = closesocket (listener);
+    wsa_assert (rc != SOCKET_ERROR);
+
+    return 0;
+
+#elif defined ZMQ_HAVE_OPENVMS
+
+    //  Whilst OpenVMS supports socketpair - it maps to AF_INET only.  Further,
+    //  it does not set the socket options TCP_NODELAY and TCP_NODELACK which
+    //  can lead to performance problems.
+    //
+    //  The bug will be fixed in V5.6 ECO4 and beyond.  In the meantime, we'll
+    //  create the socket pair manually.
+    sockaddr_in lcladdr;
+    memset (&lcladdr, 0, sizeof (lcladdr));
+    lcladdr.sin_family = AF_INET;
+    lcladdr.sin_addr.s_addr = htonl (INADDR_LOOPBACK);
+    lcladdr.sin_port = 0;
+
+    int listener = socket (AF_INET, SOCK_STREAM, 0);
+    errno_assert (listener != -1);
+
+    int on = 1;
+    int rc = setsockopt (listener, IPPROTO_TCP, TCP_NODELAY, &on, sizeof (on));
+    errno_assert (rc != -1);
+
+    rc = setsockopt (listener, IPPROTO_TCP, TCP_NODELACK, &on, sizeof (on));
+    errno_assert (rc != -1);
+
+    rc = bind(listener, (struct sockaddr*) &lcladdr, sizeof (lcladdr));
+    errno_assert (rc != -1);
+
+    socklen_t lcladdr_len = sizeof (lcladdr);
+
+    rc = getsockname (listener, (struct sockaddr*) &lcladdr, &lcladdr_len);
+    errno_assert (rc != -1);
+
+    rc = listen (listener, 1);
+    errno_assert (rc != -1);
+
+    *w_ = socket (AF_INET, SOCK_STREAM, 0);
+    errno_assert (*w_ != -1);
+
+    rc = setsockopt (*w_, IPPROTO_TCP, TCP_NODELAY, &on, sizeof (on));
+    errno_assert (rc != -1);
+
+    rc = setsockopt (*w_, IPPROTO_TCP, TCP_NODELACK, &on, sizeof (on));
+    errno_assert (rc != -1);
+
+    rc = connect (*w_, (struct sockaddr*) &lcladdr, sizeof (lcladdr));
+    errno_assert (rc != -1);
+
+    *r_ = accept (listener, NULL, NULL);
+    errno_assert (*r_ != -1);
+
+    close (listener);
+
+    return 0;
+
+#else // All other implementations support socketpair()
+
+    int sv [2];
+    int rc = socketpair (AF_UNIX, SOCK_STREAM, 0, sv);
+    errno_assert (rc == 0);
+    *w_ = sv [0];
+    *r_ = sv [1];
+    return 0;
+
+#endif
+}
+
diff --git a/src/mailbox.hpp b/src/mailbox.hpp
new file mode 100644
index 0000000..96bf4eb
--- /dev/null
+++ b/src/mailbox.hpp
@@ -0,0 +1,62 @@
+/*
+    Copyright (c) 2007-2011 iMatix Corporation
+    Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
+
+    This file is part of 0MQ.
+
+    0MQ is free software; you can redistribute it and/or modify it under
+    the terms of the GNU Lesser General Public License as published by
+    the Free Software Foundation; either version 3 of the License, or
+    (at your option) any later version.
+
+    0MQ is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU Lesser General Public License for more details.
+
+    You should have received a copy of the GNU Lesser General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef __ZMQ_MAILBOX_HPP_INCLUDED__
+#define __ZMQ_MAILBOX_HPP_INCLUDED__
+
+#include <stddef.h>
+
+#include "platform.hpp"
+#include "fd.hpp"
+#include "stdint.hpp"
+#include "config.hpp"
+#include "command.hpp"
+
+namespace zmq
+{
+
+    class mailbox_t
+    {
+    public:
+
+        mailbox_t ();
+        ~mailbox_t ();
+
+        fd_t get_fd ();
+        void send (const command_t &cmd_);
+        int recv (command_t *cmd_, bool block_);
+        
+    private:
+
+        //  Write & read end of the socketpair.
+        fd_t w;
+        fd_t r;
+
+        //  Platform-dependent function to create a socketpair.
+        static int make_socketpair (fd_t *r_, fd_t *w_);
+
+        //  Disable copying of mailbox_t object.
+        mailbox_t (const mailbox_t&);
+        const mailbox_t &operator = (const mailbox_t&);
+    };
+
+}
+
+#endif
diff --git a/src/msg_content.hpp b/src/msg_content.hpp
index d409d45..7e22098 100644
--- a/src/msg_content.hpp
+++ b/src/msg_content.hpp
@@ -1,19 +1,20 @@
 /*
-    Copyright (c) 2007-2010 iMatix Corporation
+    Copyright (c) 2007-2011 iMatix Corporation
+    Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
 
     This file is part of 0MQ.
 
     0MQ is free software; you can redistribute it and/or modify it under
-    the terms of the Lesser GNU General Public License as published by
+    the terms of the GNU Lesser General Public License as published by
     the Free Software Foundation; either version 3 of the License, or
     (at your option) any later version.
 
     0MQ is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    Lesser GNU General Public License for more details.
+    GNU Lesser General Public License for more details.
 
-    You should have received a copy of the Lesser GNU General Public License
+    You should have received a copy of the GNU Lesser General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
diff --git a/src/mutex.hpp b/src/mutex.hpp
index 3306d2e..9b13ffa 100644
--- a/src/mutex.hpp
+++ b/src/mutex.hpp
@@ -1,19 +1,20 @@
 /*
-    Copyright (c) 2007-2010 iMatix Corporation
+    Copyright (c) 2007-2011 iMatix Corporation
+    Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
 
     This file is part of 0MQ.
 
     0MQ is free software; you can redistribute it and/or modify it under
-    the terms of the Lesser GNU General Public License as published by
+    the terms of the GNU Lesser General Public License as published by
     the Free Software Foundation; either version 3 of the License, or
     (at your option) any later version.
 
     0MQ is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    Lesser GNU General Public License for more details.
+    GNU Lesser General Public License for more details.
 
-    You should have received a copy of the Lesser GNU General Public License
+    You should have received a copy of the GNU Lesser General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
@@ -110,7 +111,7 @@ namespace zmq
  
         // Disable copy construction and assignment.
         mutex_t (const mutex_t&);
-        void operator = (const mutex_t&);
+        const mutex_t &operator = (const mutex_t&);
     };
  
 }
diff --git a/src/named_session.cpp b/src/named_session.cpp
new file mode 100644
index 0000000..2532c5a
--- /dev/null
+++ b/src/named_session.cpp
@@ -0,0 +1,85 @@
+/*
+    Copyright (c) 2007-2011 iMatix Corporation
+    Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
+
+    This file is part of 0MQ.
+
+    0MQ is free software; you can redistribute it and/or modify it under
+    the terms of the GNU Lesser General Public License as published by
+    the Free Software Foundation; either version 3 of the License, or
+    (at your option) any later version.
+
+    0MQ is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU Lesser General Public License for more details.
+
+    You should have received a copy of the GNU Lesser General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "named_session.hpp"
+#include "socket_base.hpp"
+
+zmq::named_session_t::named_session_t (class io_thread_t *io_thread_,
+      socket_base_t *socket_, const options_t &options_,
+      const blob_t &name_) :
+    session_t (io_thread_, socket_, options_),
+    name (name_)
+{
+    //  Make double sure that the session has valid name.
+    zmq_assert (!name.empty ());
+    zmq_assert (name [0] != 0);
+
+    if (!socket_->register_session (name, this)) {
+
+        //  TODO: There's already a session with the specified
+        //  identity. We should log the error and drop the
+        //  session.
+        zmq_assert (false);
+    }
+}
+
+zmq::named_session_t::~named_session_t ()
+{
+    //  Unregister the session from the global list of named sessions.
+    if (!name.empty ())
+        unregister_session (name);
+}
+
+void zmq::named_session_t::attached (const blob_t &peer_identity_)
+{
+    if (!name.empty ()) {
+
+        //  If both IDs are temporary, no checking is needed.
+        //  TODO: Old ID should be reused in this case...
+        if (name.empty () || name [0] != 0 ||
+            peer_identity_.empty () || peer_identity_ [0] != 0) {
+
+            //  If we already know the peer name do nothing, just check whether
+            //  it haven't changed.
+            zmq_assert (name == peer_identity_);
+        }
+    }
+    else if (!peer_identity_.empty ()) {
+
+        //  Store the peer identity.
+        name = peer_identity_;
+
+        //  Register the session using the peer name.
+        if (!register_session (name, this)) {
+
+            //  TODO: There's already a session with the specified
+            //  identity. We should presumably syslog it and drop the
+            //  session.
+            zmq_assert (false);
+        }
+    }
+}
+
+void zmq::named_session_t::detached ()
+{
+    //  Do nothing. Named sessions are never destroyed because of disconnection,
+    //  neither they have to actively reconnect.
+}
+
diff --git a/src/named_session.hpp b/src/named_session.hpp
new file mode 100644
index 0000000..cf31209
--- /dev/null
+++ b/src/named_session.hpp
@@ -0,0 +1,57 @@
+/*
+    Copyright (c) 2007-2011 iMatix Corporation
+    Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
+
+    This file is part of 0MQ.
+
+    0MQ is free software; you can redistribute it and/or modify it under
+    the terms of the GNU Lesser General Public License as published by
+    the Free Software Foundation; either version 3 of the License, or
+    (at your option) any later version.
+
+    0MQ is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU Lesser General Public License for more details.
+
+    You should have received a copy of the GNU Lesser General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef __ZMQ_NAMED_SESSION_HPP_INCLUDED__
+#define __ZMQ_NAMED_SESSION_HPP_INCLUDED__
+
+#include "session.hpp"
+#include "blob.hpp"
+
+namespace zmq
+{
+
+    //  Named session is created by listener object when the peer identifies
+    //  itself by a strong name. Named session survives reconnections.
+
+    class named_session_t : public session_t
+    {
+    public:
+
+        named_session_t (class io_thread_t *io_thread_,
+            class socket_base_t *socket_, const options_t &options_, 
+            const blob_t &name_);
+        ~named_session_t ();
+
+        //  Handlers for events from session base class.
+        void attached (const blob_t &peer_identity_);
+        void detached ();
+
+    private:
+
+        //  Name of the session. Corresponds to the peer's strong identity.
+        blob_t name;
+
+        named_session_t (const named_session_t&);
+        const named_session_t &operator = (const named_session_t&);
+    };
+
+}
+
+#endif
diff --git a/src/object.cpp b/src/object.cpp
index 324450f..e2ca6d6 100644
--- a/src/object.cpp
+++ b/src/object.cpp
@@ -1,42 +1,43 @@
 /*
-    Copyright (c) 2007-2010 iMatix Corporation
+    Copyright (c) 2007-2011 iMatix Corporation
+    Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
 
     This file is part of 0MQ.
 
     0MQ is free software; you can redistribute it and/or modify it under
-    the terms of the Lesser GNU General Public License as published by
+    the terms of the GNU Lesser General Public License as published by
     the Free Software Foundation; either version 3 of the License, or
     (at your option) any later version.
 
     0MQ is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    Lesser GNU General Public License for more details.
+    GNU Lesser General Public License for more details.
 
-    You should have received a copy of the Lesser GNU General Public License
+    You should have received a copy of the GNU Lesser General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
 #include <string.h>
+#include <stdarg.h>
 
 #include "object.hpp"
 #include "ctx.hpp"
 #include "err.hpp"
 #include "pipe.hpp"
 #include "io_thread.hpp"
-#include "owned.hpp"
 #include "session.hpp"
 #include "socket_base.hpp"
 
-zmq::object_t::object_t (ctx_t *ctx_, uint32_t thread_slot_) :
+zmq::object_t::object_t (ctx_t *ctx_, uint32_t tid_) :
     ctx (ctx_),
-    thread_slot (thread_slot_)
+    tid (tid_)
 {
 }
 
 zmq::object_t::object_t (object_t *parent_) :
     ctx (parent_->ctx),
-    thread_slot (parent_->thread_slot)
+    tid (parent_->tid)
 {
 }
 
@@ -44,9 +45,9 @@ zmq::object_t::~object_t ()
 {
 }
 
-uint32_t zmq::object_t::get_thread_slot ()
+uint32_t zmq::object_t::get_tid ()
 {
-    return thread_slot;
+    return tid;
 }
 
 zmq::ctx_t *zmq::object_t::get_ctx ()
@@ -58,8 +59,12 @@ void zmq::object_t::process_command (command_t &cmd_)
 {
     switch (cmd_.type) {
 
-    case command_t::revive:
-        process_revive ();
+    case command_t::activate_reader:
+        process_activate_reader ();
+        break;
+
+    case command_t::activate_writer:
+        process_activate_writer (cmd_.args.activate_writer.msgs_read);
         break;
 
     case command_t::stop:
@@ -78,22 +83,19 @@ void zmq::object_t::process_command (command_t &cmd_)
 
     case command_t::attach:
         process_attach (cmd_.args.attach.engine,
+            cmd_.args.attach.peer_identity ?
             blob_t (cmd_.args.attach.peer_identity,
-            cmd_.args.attach.peer_identity_size));
+            cmd_.args.attach.peer_identity_size) : blob_t ());
         process_seqnum ();
         break;
 
     case command_t::bind:
         process_bind (cmd_.args.bind.in_pipe, cmd_.args.bind.out_pipe,
-            blob_t (cmd_.args.bind.peer_identity,
-            cmd_.args.bind.peer_identity_size));
+            cmd_.args.bind.peer_identity ? blob_t (cmd_.args.bind.peer_identity,
+            cmd_.args.bind.peer_identity_size) : blob_t ());
         process_seqnum ();
         break;
 
-    case command_t::reader_info:
-        process_reader_info (cmd_.args.reader_info.msgs_read);
-        break;
-
     case command_t::pipe_term:
         process_pipe_term ();
         return;
@@ -107,13 +109,21 @@ void zmq::object_t::process_command (command_t &cmd_)
         break;
     
     case command_t::term:
-        process_term ();
+        process_term (cmd_.args.term.linger);
         break;
 
     case command_t::term_ack:
         process_term_ack ();
         break;
 
+    case command_t::reap:
+        process_reap (cmd_.args.reap.socket);
+        break;
+
+    case command_t::reaped:
+        process_reaped ();
+        break;
+
     default:
         zmq_assert (false);
     }
@@ -123,34 +133,37 @@ void zmq::object_t::process_command (command_t &cmd_)
     deallocate_command (&cmd_);
 }
 
-void zmq::object_t::register_pipe (class pipe_t *pipe_)
+int zmq::object_t::register_endpoint (const char *addr_, endpoint_t &endpoint_)
 {
-    ctx->register_pipe (pipe_);
+    return ctx->register_endpoint (addr_, endpoint_);
 }
 
-void zmq::object_t::unregister_pipe (class pipe_t *pipe_)
+void zmq::object_t::unregister_endpoints (socket_base_t *socket_)
 {
-    ctx->unregister_pipe (pipe_);
+    return ctx->unregister_endpoints (socket_);
 }
 
-int zmq::object_t::register_endpoint (const char *addr_, socket_base_t *socket_)
+zmq::endpoint_t zmq::object_t::find_endpoint (const char *addr_)
 {
-    return ctx->register_endpoint (addr_, socket_);
+    return ctx->find_endpoint (addr_);
 }
 
-void zmq::object_t::unregister_endpoints (socket_base_t *socket_)
+void zmq::object_t::destroy_socket (socket_base_t *socket_)
 {
-    return ctx->unregister_endpoints (socket_);
+    ctx->destroy_socket (socket_);
 }
 
-zmq::socket_base_t *zmq::object_t::find_endpoint (const char *addr_)
+void zmq::object_t::log (const char *format_, ...)
 {
-    return ctx->find_endpoint (addr_);
+    va_list args;
+    va_start (args, format_);
+    ctx->log (format_, args);
+    va_end (args);
 }
 
-zmq::io_thread_t *zmq::object_t::choose_io_thread (uint64_t taskset_)
+zmq::io_thread_t *zmq::object_t::choose_io_thread (uint64_t affinity_)
 {
-    return ctx->choose_io_thread (taskset_);
+    return ctx->choose_io_thread (affinity_);
 }
 
 void zmq::object_t::send_stop ()
@@ -158,26 +171,35 @@ void zmq::object_t::send_stop ()
     //  'stop' command goes always from administrative thread to
     //  the current object. 
     command_t cmd;
+#if defined ZMQ_MAKE_VALGRIND_HAPPY
+    memset (&cmd, 0, sizeof (cmd));
+#endif
     cmd.destination = this;
     cmd.type = command_t::stop;
-    ctx->send_command (thread_slot, cmd);
+    ctx->send_command (tid, cmd);
 }
 
-void zmq::object_t::send_plug (owned_t *destination_, bool inc_seqnum_)
+void zmq::object_t::send_plug (own_t *destination_, bool inc_seqnum_)
 {
     if (inc_seqnum_)
         destination_->inc_seqnum ();
 
     command_t cmd;
+#if defined ZMQ_MAKE_VALGRIND_HAPPY
+    memset (&cmd, 0, sizeof (cmd));
+#endif
     cmd.destination = destination_;
     cmd.type = command_t::plug;
     send_command (cmd);
 }
 
-void zmq::object_t::send_own (socket_base_t *destination_, owned_t *object_)
+void zmq::object_t::send_own (own_t *destination_, own_t *object_)
 {
     destination_->inc_seqnum ();
     command_t cmd;
+#if defined ZMQ_MAKE_VALGRIND_HAPPY
+    memset (&cmd, 0, sizeof (cmd));
+#endif
     cmd.destination = destination_;
     cmd.type = command_t::own;
     cmd.args.own.object = object_;
@@ -191,6 +213,9 @@ void zmq::object_t::send_attach (session_t *destination_, i_engine *engine_,
         destination_->inc_seqnum ();
 
     command_t cmd;
+#if defined ZMQ_MAKE_VALGRIND_HAPPY
+    memset (&cmd, 0, sizeof (cmd));
+#endif
     cmd.destination = destination_;
     cmd.type = command_t::attach;
     cmd.args.attach.engine = engine_;
@@ -204,21 +229,23 @@ void zmq::object_t::send_attach (session_t *destination_, i_engine *engine_,
             (unsigned char) peer_identity_.size ();
         cmd.args.attach.peer_identity =
             (unsigned char*) malloc (peer_identity_.size ());
-        zmq_assert (cmd.args.attach.peer_identity_size);
+        alloc_assert (cmd.args.attach.peer_identity_size);
         memcpy (cmd.args.attach.peer_identity, peer_identity_.data (),
             peer_identity_.size ());
     }
     send_command (cmd);
 }
 
-void zmq::object_t::send_bind (socket_base_t *destination_,
-    reader_t *in_pipe_, writer_t *out_pipe_, const blob_t &peer_identity_,
-    bool inc_seqnum_)
+void zmq::object_t::send_bind (own_t *destination_, reader_t *in_pipe_,
+    writer_t *out_pipe_, const blob_t &peer_identity_, bool inc_seqnum_)
 {
     if (inc_seqnum_)
         destination_->inc_seqnum ();
 
     command_t cmd;
+#if defined ZMQ_MAKE_VALGRIND_HAPPY
+    memset (&cmd, 0, sizeof (cmd));
+#endif
     cmd.destination = destination_;
     cmd.type = command_t::bind;
     cmd.args.bind.in_pipe = in_pipe_;
@@ -233,34 +260,43 @@ void zmq::object_t::send_bind (socket_base_t *destination_,
             (unsigned char) peer_identity_.size ();
         cmd.args.bind.peer_identity =
             (unsigned char*) malloc (peer_identity_.size ());
-        zmq_assert (cmd.args.bind.peer_identity_size);
+        alloc_assert (cmd.args.bind.peer_identity_size);
         memcpy (cmd.args.bind.peer_identity, peer_identity_.data (),
             peer_identity_.size ());
     }
     send_command (cmd);
 }
 
-void zmq::object_t::send_revive (object_t *destination_)
+void zmq::object_t::send_activate_reader (reader_t *destination_)
 {
     command_t cmd;
+#if defined ZMQ_MAKE_VALGRIND_HAPPY
+    memset (&cmd, 0, sizeof (cmd));
+#endif
     cmd.destination = destination_;
-    cmd.type = command_t::revive;
+    cmd.type = command_t::activate_reader;
     send_command (cmd);
 }
 
-void zmq::object_t::send_reader_info (writer_t *destination_,
+void zmq::object_t::send_activate_writer (writer_t *destination_,
     uint64_t msgs_read_)
 {
     command_t cmd;
+#if defined ZMQ_MAKE_VALGRIND_HAPPY
+    memset (&cmd, 0, sizeof (cmd));
+#endif
     cmd.destination = destination_;
-    cmd.type = command_t::reader_info;
-    cmd.args.reader_info.msgs_read = msgs_read_;
+    cmd.type = command_t::activate_writer;
+    cmd.args.activate_writer.msgs_read = msgs_read_;
     send_command (cmd);
 }
 
 void zmq::object_t::send_pipe_term (writer_t *destination_)
 {
     command_t cmd;
+#if defined ZMQ_MAKE_VALGRIND_HAPPY
+    memset (&cmd, 0, sizeof (cmd));
+#endif
     cmd.destination = destination_;
     cmd.type = command_t::pipe_term;
     send_command (cmd);
@@ -269,37 +305,84 @@ void zmq::object_t::send_pipe_term (writer_t *destination_)
 void zmq::object_t::send_pipe_term_ack (reader_t *destination_)
 {
     command_t cmd;
+#if defined ZMQ_MAKE_VALGRIND_HAPPY
+    memset (&cmd, 0, sizeof (cmd));
+#endif
     cmd.destination = destination_;
     cmd.type = command_t::pipe_term_ack;
     send_command (cmd);
 }
 
-void zmq::object_t::send_term_req (socket_base_t *destination_,
-    owned_t *object_)
+void zmq::object_t::send_term_req (own_t *destination_,
+    own_t *object_)
 {
     command_t cmd;
+#if defined ZMQ_MAKE_VALGRIND_HAPPY
+    memset (&cmd, 0, sizeof (cmd));
+#endif
     cmd.destination = destination_;
     cmd.type = command_t::term_req;
     cmd.args.term_req.object = object_;
     send_command (cmd);
 }
 
-void zmq::object_t::send_term (owned_t *destination_)
+void zmq::object_t::send_term (own_t *destination_, int linger_)
 {
     command_t cmd;
+#if defined ZMQ_MAKE_VALGRIND_HAPPY
+    memset (&cmd, 0, sizeof (cmd));
+#endif
     cmd.destination = destination_;
     cmd.type = command_t::term;
+    cmd.args.term.linger = linger_;
     send_command (cmd);
 }
 
-void zmq::object_t::send_term_ack (socket_base_t *destination_)
+void zmq::object_t::send_term_ack (own_t *destination_)
 {
     command_t cmd;
+#if defined ZMQ_MAKE_VALGRIND_HAPPY
+    memset (&cmd, 0, sizeof (cmd));
+#endif
     cmd.destination = destination_;
     cmd.type = command_t::term_ack;
     send_command (cmd);
 }
 
+void zmq::object_t::send_reap (class socket_base_t *socket_)
+{
+    command_t cmd;
+#if defined ZMQ_MAKE_VALGRIND_HAPPY
+    memset (&cmd, 0, sizeof (cmd));
+#endif
+    cmd.destination = ctx->get_reaper ();
+    cmd.type = command_t::reap;
+    cmd.args.reap.socket = socket_;
+    send_command (cmd);
+}
+
+void zmq::object_t::send_reaped ()
+{
+    command_t cmd;
+#if defined ZMQ_MAKE_VALGRIND_HAPPY
+    memset (&cmd, 0, sizeof (cmd));
+#endif
+    cmd.destination = ctx->get_reaper ();
+    cmd.type = command_t::reaped;
+    send_command (cmd);
+}
+
+void zmq::object_t::send_done ()
+{
+    command_t cmd;
+#if defined ZMQ_MAKE_VALGRIND_HAPPY
+    memset (&cmd, 0, sizeof (cmd));
+#endif
+    cmd.destination = NULL;
+    cmd.type = command_t::done;
+    ctx->send_command (ctx_t::term_tid, cmd);
+}
+
 void zmq::object_t::process_stop ()
 {
     zmq_assert (false);
@@ -310,7 +393,7 @@ void zmq::object_t::process_plug ()
     zmq_assert (false);
 }
 
-void zmq::object_t::process_own (owned_t *object_)
+void zmq::object_t::process_own (own_t *object_)
 {
     zmq_assert (false);
 }
@@ -327,12 +410,12 @@ void zmq::object_t::process_bind (reader_t *in_pipe_, writer_t *out_pipe_,
     zmq_assert (false);
 }
 
-void zmq::object_t::process_revive ()
+void zmq::object_t::process_activate_reader ()
 {
     zmq_assert (false);
 }
 
-void zmq::object_t::process_reader_info (uint64_t msgs_read_)
+void zmq::object_t::process_activate_writer (uint64_t msgs_read_)
 {
     zmq_assert (false);
 }
@@ -347,12 +430,12 @@ void zmq::object_t::process_pipe_term_ack ()
     zmq_assert (false);
 }
 
-void zmq::object_t::process_term_req (owned_t *object_)
+void zmq::object_t::process_term_req (own_t *object_)
 {
     zmq_assert (false);
 }
 
-void zmq::object_t::process_term ()
+void zmq::object_t::process_term (int linger_)
 {
     zmq_assert (false);
 }
@@ -362,6 +445,16 @@ void zmq::object_t::process_term_ack ()
     zmq_assert (false);
 }
 
+void zmq::object_t::process_reap (class socket_base_t *socket_)
+{
+    zmq_assert (false);
+}
+
+void zmq::object_t::process_reaped ()
+{
+    zmq_assert (false);
+}
+
 void zmq::object_t::process_seqnum ()
 {
     zmq_assert (false);
@@ -369,6 +462,6 @@ void zmq::object_t::process_seqnum ()
 
 void zmq::object_t::send_command (command_t &cmd_)
 {
-    ctx->send_command (cmd_.destination->get_thread_slot (), cmd_);
+    ctx->send_command (cmd_.destination->get_tid (), cmd_);
 }
 
diff --git a/src/object.hpp b/src/object.hpp
index a38b0a6..706303b 100644
--- a/src/object.hpp
+++ b/src/object.hpp
@@ -1,25 +1,28 @@
 /*
-    Copyright (c) 2007-2010 iMatix Corporation
+    Copyright (c) 2007-2011 iMatix Corporation
+    Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
 
     This file is part of 0MQ.
 
     0MQ is free software; you can redistribute it and/or modify it under
-    the terms of the Lesser GNU General Public License as published by
+    the terms of the GNU Lesser General Public License as published by
     the Free Software Foundation; either version 3 of the License, or
     (at your option) any later version.
 
     0MQ is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    Lesser GNU General Public License for more details.
+    GNU Lesser General Public License for more details.
 
-    You should have received a copy of the Lesser GNU General Public License
+    You should have received a copy of the GNU Lesser General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
 #ifndef __ZMQ_OBJECT_HPP_INCLUDED__
 #define __ZMQ_OBJECT_HPP_INCLUDED__
 
+#include "../include/zmq.h"
+
 #include "stdint.hpp"
 #include "blob.hpp"
 
@@ -32,67 +35,73 @@ namespace zmq
     {
     public:
 
-        object_t (class ctx_t *ctx_, uint32_t thread_slot_);
+        object_t (class ctx_t *ctx_, uint32_t tid_);
         object_t (object_t *parent_);
         virtual ~object_t ();
 
-        uint32_t get_thread_slot ();
+        uint32_t get_tid ();
         ctx_t *get_ctx ();
         void process_command (struct command_t &cmd_);
 
-        //  Allow pipe to access corresponding context functions.
-        void register_pipe (class pipe_t *pipe_);
-        void unregister_pipe (class pipe_t *pipe_);
-
     protected:
 
         //  Using following function, socket is able to access global
         //  repository of inproc endpoints.
-        int register_endpoint (const char *addr_, class socket_base_t *socket_);
+        int register_endpoint (const char *addr_, struct endpoint_t &endpoint_);
         void unregister_endpoints (class socket_base_t *socket_);
-        class socket_base_t *find_endpoint (const char *addr_);
+        struct endpoint_t find_endpoint (const char *addr_);
+        void destroy_socket (class socket_base_t *socket_);
+
+        //  Logs an message.
+        void log (const char *format_, ...);
 
         //  Chooses least loaded I/O thread.
-        class io_thread_t *choose_io_thread (uint64_t taskset_);
+        class io_thread_t *choose_io_thread (uint64_t affinity_);
 
         //  Derived object can use these functions to send commands
         //  to other objects.
         void send_stop ();
-        void send_plug (class owned_t *destination_, bool inc_seqnum_ = true);
-        void send_own (class socket_base_t *destination_,
-            class owned_t *object_);
+        void send_plug (class own_t *destination_,
+            bool inc_seqnum_ = true);
+        void send_own (class own_t *destination_,
+            class own_t *object_);
         void send_attach (class session_t *destination_,
              struct i_engine *engine_, const blob_t &peer_identity_,
              bool inc_seqnum_ = true);
-        void send_bind (class socket_base_t *destination_,
+        void send_bind (class own_t *destination_,
              class reader_t *in_pipe_, class writer_t *out_pipe_,
              const blob_t &peer_identity_, bool inc_seqnum_ = true);
-        void send_revive (class object_t *destination_);
-        void send_reader_info (class writer_t *destination_,
+        void send_activate_reader (class reader_t *destination_);
+        void send_activate_writer (class writer_t *destination_,
              uint64_t msgs_read_);
         void send_pipe_term (class writer_t *destination_);
         void send_pipe_term_ack (class reader_t *destination_);
-        void send_term_req (class socket_base_t *destination_,
-            class owned_t *object_);
-        void send_term (class owned_t *destination_);
-        void send_term_ack (class socket_base_t *destination_);
+        void send_term_req (class own_t *destination_,
+            class own_t *object_);
+        void send_term (class own_t *destination_, int linger_);
+        void send_term_ack (class own_t *destination_);
+        void send_reap (class socket_base_t *socket_);
+        void send_reaped ();
+        void send_done ();
 
         //  These handlers can be overloaded by the derived objects. They are
         //  called when command arrives from another thread.
         virtual void process_stop ();
         virtual void process_plug ();
-        virtual void process_own (class owned_t *object_);
+        virtual void process_own (class own_t *object_);
         virtual void process_attach (struct i_engine *engine_,
             const blob_t &peer_identity_);
         virtual void process_bind (class reader_t *in_pipe_,
             class writer_t *out_pipe_, const blob_t &peer_identity_);
-        virtual void process_revive ();
-        virtual void process_reader_info (uint64_t msgs_read_);
+        virtual void process_activate_reader ();
+        virtual void process_activate_writer (uint64_t msgs_read_);
         virtual void process_pipe_term ();
         virtual void process_pipe_term_ack ();
-        virtual void process_term_req (class owned_t *object_);
-        virtual void process_term ();
+        virtual void process_term_req (class own_t *object_);
+        virtual void process_term (int linger_);
         virtual void process_term_ack ();
+        virtual void process_reap (class socket_base_t *socket_);
+        virtual void process_reaped ();
 
         //  Special handler called after a command that requires a seqnum
         //  was processed. The implementation should catch up with its counter
@@ -104,13 +113,13 @@ namespace zmq
         //  Context provides access to the global state.
         class ctx_t *ctx;
 
-        //  Slot ID of the thread the object belongs to.
-        uint32_t thread_slot;
+        //  Thread ID of the thread the object belongs to.
+        uint32_t tid;
 
         void send_command (command_t &cmd_);
 
         object_t (const object_t&);
-        void operator = (const object_t&);
+        const object_t &operator = (const object_t&);
     };
 
 }
diff --git a/src/options.cpp b/src/options.cpp
index dcbb51d..92887ab 100644
--- a/src/options.cpp
+++ b/src/options.cpp
@@ -1,19 +1,20 @@
 /*
-    Copyright (c) 2007-2010 iMatix Corporation
+    Copyright (c) 2007-2011 iMatix Corporation
+    Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
 
     This file is part of 0MQ.
 
     0MQ is free software; you can redistribute it and/or modify it under
-    the terms of the Lesser GNU General Public License as published by
+    the terms of the GNU Lesser General Public License as published by
     the Free Software Foundation; either version 3 of the License, or
     (at your option) any later version.
 
     0MQ is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    Lesser GNU General Public License for more details.
+    GNU Lesser General Public License for more details.
 
-    You should have received a copy of the Lesser GNU General Public License
+    You should have received a copy of the GNU Lesser General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
@@ -28,11 +29,17 @@ zmq::options_t::options_t () :
     hwm (0),
     swap (0),
     affinity (0),
-    rate (100),
+    rate (40 * 1000),
     recovery_ivl (10),
+    recovery_ivl_msec (-1),
     use_multicast_loop (true),
     sndbuf (0),
     rcvbuf (0),
+    type (-1),
+    linger (-1),
+    reconnect_ivl (100),
+    reconnect_ivl_max (0),
+    backlog (100),
     requires_in (false),
     requires_out (false),
     immediate_connect (true)
@@ -97,6 +104,14 @@ int zmq::options_t::setsockopt (int option_, const void *optval_,
         recovery_ivl = (uint32_t) *((int64_t*) optval_);
         return 0;
 
+    case ZMQ_RECOVERY_IVL_MSEC:
+        if (optvallen_ != sizeof (int64_t)  || *((int64_t*) optval_) < 0) {
+            errno = EINVAL;
+            return -1;
+        }
+        recovery_ivl_msec = (int32_t) *((int64_t*) optval_);
+        return 0;
+
     case ZMQ_MCAST_LOOP:
         if (optvallen_ != sizeof (int64_t)) {
             errno = EINVAL;
@@ -127,6 +142,47 @@ int zmq::options_t::setsockopt (int option_, const void *optval_,
         }
         rcvbuf = *((uint64_t*) optval_);
         return 0;
+
+    case ZMQ_LINGER:
+        if (optvallen_ != sizeof (int)) {
+            errno = EINVAL;
+            return -1;
+        }
+        linger = *((int*) optval_);
+        return 0;
+
+    case ZMQ_RECONNECT_IVL:
+        if (optvallen_ != sizeof (int)) {
+            errno = EINVAL;
+            return -1;
+        }
+        if (*((int*) optval_) < 0) {
+            errno = EINVAL;
+            return -1;
+        }
+        reconnect_ivl = *((int*) optval_);
+        return 0;
+
+    case ZMQ_RECONNECT_IVL_MAX:
+        if (optvallen_ != sizeof (int)) {
+            errno = EINVAL;
+            return -1;
+        }
+        if (*((int*) optval_) < 0) {
+            errno = EINVAL;
+            return -1;
+        }
+        reconnect_ivl_max = *((int*) optval_);
+        return 0;
+
+    case ZMQ_BACKLOG:
+        if (optvallen_ != sizeof (int)) {
+            errno = EINVAL;
+            return -1;
+        }
+        backlog = *((int*) optval_);
+        return 0;
+
     }
 
     errno = EINVAL;
@@ -192,6 +248,15 @@ int zmq::options_t::getsockopt (int option_, void *optval_, size_t *optvallen_)
         *optvallen_ = sizeof (int64_t);
         return 0;
 
+    case ZMQ_RECOVERY_IVL_MSEC:
+        if (*optvallen_ < sizeof (int64_t)) {
+            errno = EINVAL;
+            return -1;
+        }
+        *((int64_t*) optval_) = recovery_ivl_msec;
+        *optvallen_ = sizeof (int64_t);
+        return 0;
+
     case ZMQ_MCAST_LOOP:
         if (*optvallen_ < sizeof (int64_t)) {
             errno = EINVAL;
@@ -218,6 +283,52 @@ int zmq::options_t::getsockopt (int option_, void *optval_, size_t *optvallen_)
         *((uint64_t*) optval_) = rcvbuf;
         *optvallen_ = sizeof (uint64_t);
         return 0;
+
+    case ZMQ_TYPE:
+        if (*optvallen_ < sizeof (int)) {
+            errno = EINVAL;
+            return -1;
+        }
+        *((int*) optval_) = type;
+        *optvallen_ = sizeof (int);
+        return 0;
+
+    case ZMQ_LINGER:
+        if (*optvallen_ < sizeof (int)) {
+            errno = EINVAL;
+            return -1;
+        }
+        *((int*) optval_) = linger;
+        *optvallen_ = sizeof (int);
+        return 0;
+
+    case ZMQ_RECONNECT_IVL:
+        if (*optvallen_ < sizeof (int)) {
+            errno = EINVAL;
+            return -1;
+        }
+        *((int*) optval_) = reconnect_ivl;
+        *optvallen_ = sizeof (int);
+        return 0;
+
+    case ZMQ_RECONNECT_IVL_MAX:
+        if (*optvallen_ < sizeof (int)) {
+            errno = EINVAL;
+            return -1;
+        }
+        *((int*) optval_) = reconnect_ivl_max;
+        *optvallen_ = sizeof (int);
+        return 0;
+
+    case ZMQ_BACKLOG:
+        if (*optvallen_ < sizeof (int)) {
+            errno = EINVAL;
+            return -1;
+        }
+        *((int*) optval_) = backlog;
+        *optvallen_ = sizeof (int);
+        return 0;
+
     }
 
     errno = EINVAL;
diff --git a/src/options.hpp b/src/options.hpp
index 908b166..b2e29d0 100644
--- a/src/options.hpp
+++ b/src/options.hpp
@@ -1,19 +1,20 @@
 /*
-    Copyright (c) 2007-2010 iMatix Corporation
+    Copyright (c) 2007-2011 iMatix Corporation
+    Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
 
     This file is part of 0MQ.
 
     0MQ is free software; you can redistribute it and/or modify it under
-    the terms of the Lesser GNU General Public License as published by
+    the terms of the GNU Lesser General Public License as published by
     the Free Software Foundation; either version 3 of the License, or
     (at your option) any later version.
 
     0MQ is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    Lesser GNU General Public License for more details.
+    GNU Lesser General Public License for more details.
 
-    You should have received a copy of the Lesser GNU General Public License
+    You should have received a copy of the GNU Lesser General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
@@ -44,6 +45,8 @@ namespace zmq
 
         //  Reliability time interval [s]. Default 10s.
         uint32_t recovery_ivl;
+        //  Reliability time interval [ms]. Default -1 = not used.
+        int32_t recovery_ivl_msec;
 
         //  Enable multicast loopback. Default disabled (false).
         bool use_multicast_loop;
@@ -51,6 +54,22 @@ namespace zmq
         uint64_t sndbuf;
         uint64_t rcvbuf;
 
+        //  Socket type.
+        int type;
+
+        //  Linger time, in milliseconds.
+        int linger;
+
+        //  Minimum interval between attempts to reconnect, in milliseconds.
+        //  Default 100ms
+        int reconnect_ivl;
+        //  Maximum interval between attempts to reconnect, in milliseconds.
+        //  Default 0 (unused)
+        int reconnect_ivl_max;
+
+        //  Maximum backlog for pending connections.
+        int backlog;
+
         //  These options are never set by the user directly. Instead they are
         //  provided by the specific socket type.
         bool requires_in;
diff --git a/src/own.cpp b/src/own.cpp
new file mode 100644
index 0000000..57e183a
--- /dev/null
+++ b/src/own.cpp
@@ -0,0 +1,214 @@
+/*
+    Copyright (c) 2007-2011 iMatix Corporation
+    Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
+
+    This file is part of 0MQ.
+
+    0MQ is free software; you can redistribute it and/or modify it under
+    the terms of the GNU Lesser General Public License as published by
+    the Free Software Foundation; either version 3 of the License, or
+    (at your option) any later version.
+
+    0MQ is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU Lesser General Public License for more details.
+
+    You should have received a copy of the GNU Lesser General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "own.hpp"
+#include "err.hpp"
+#include "io_thread.hpp"
+
+zmq::own_t::own_t (class ctx_t *parent_, uint32_t tid_) :
+    object_t (parent_, tid_),
+    terminating (false),
+    sent_seqnum (0),
+    processed_seqnum (0),
+    owner (NULL),
+    term_acks (0)
+{
+}
+
+zmq::own_t::own_t (io_thread_t *io_thread_, const options_t &options_) :
+    object_t (io_thread_),
+    options (options_),
+    terminating (false),
+    sent_seqnum (0),
+    processed_seqnum (0),
+    owner (NULL),
+    term_acks (0)
+{
+}
+
+zmq::own_t::~own_t ()
+{
+}
+
+void zmq::own_t::set_owner (own_t *owner_)
+{
+    zmq_assert (!owner);
+    owner = owner_;
+}
+
+void zmq::own_t::inc_seqnum ()
+{
+    //  This function may be called from a different thread!
+    sent_seqnum.add (1);
+}
+
+void zmq::own_t::process_seqnum ()
+{
+    //  Catch up with counter of processed commands.
+    processed_seqnum++;
+
+    //  We may have catched up and still have pending terms acks.
+    check_term_acks ();
+}
+
+void zmq::own_t::launch_child (own_t *object_)
+{
+    //  Specify the owner of the object.
+    object_->set_owner (this);
+
+    //  Plug the object into the I/O thread.
+    send_plug (object_);
+
+    //  Take ownership of the object.
+    send_own (this, object_);
+}
+
+void zmq::own_t::launch_sibling (own_t *object_)
+{
+    //  At this point it is important that object is plugged in before its
+    //  owner has a chance to terminate it. Thus, 'plug' command is sent before
+    //  the 'own' command. Given that the mailbox preserves ordering of
+    //  commands, 'term' command from the owner cannot make it to the object
+    //  before the already written 'plug' command.
+
+    //  Specify the owner of the object.
+    object_->set_owner (owner);
+
+    //  Plug the object into its I/O thread.
+    send_plug (object_);
+
+    //  Make parent own the object.
+    send_own (owner, object_);
+}
+
+void zmq::own_t::process_term_req (own_t *object_)
+{
+    //  When shutting down we can ignore termination requests from owned
+    //  objects. The termination request was already sent to the object.
+    if (terminating)
+        return;
+
+    //  If I/O object is well and alive let's ask it to terminate.
+    owned_t::iterator it = std::find (owned.begin (), owned.end (), object_);
+
+    //  If not found, we assume that termination request was already sent to
+    //  the object so we can safely ignore the request.
+    if (it == owned.end ())
+        return;
+
+    owned.erase (it);
+    register_term_acks (1);
+
+    //  Note that this object is the root of the (partial shutdown) thus, its
+    //  value of linger is used, rather than the value stored by the children.
+    send_term (object_, options.linger);
+}
+
+void zmq::own_t::process_own (own_t *object_)
+{
+    //  If the object is already being shut down, new owned objects are
+    //  immediately asked to terminate. Note that linger is set to zero.
+    if (terminating) {
+        register_term_acks (1);
+        send_term (object_, 0);
+        return;
+    }
+
+    //  Store the reference to the owned object.
+    owned.insert (object_);
+}
+
+void zmq::own_t::terminate ()
+{
+    //  If termination is already underway, there's no point
+    //  in starting it anew.
+    if (terminating)
+        return;
+
+    //  As for the root of the ownership tree, there's noone to terminate it,
+    //  so it has to terminate itself.
+    if (!owner) {
+        process_term (options.linger);
+        return;
+    }
+
+    //  If I am an owned object, I'll ask my owner to terminate me.
+    send_term_req (owner, this);
+}
+
+void zmq::own_t::process_term (int linger_)
+{
+    //  Double termination should never happen.
+    zmq_assert (!terminating);
+
+    //  Send termination request to all owned objects.
+    for (owned_t::iterator it = owned.begin (); it != owned.end (); ++it)
+        send_term (*it, linger_);
+    register_term_acks (owned.size ());
+    owned.clear ();
+
+    //  Start termination process and check whether by chance we cannot
+    //  terminate immediately.
+    terminating = true;
+    check_term_acks ();
+}
+
+void zmq::own_t::register_term_acks (int count_)
+{
+    term_acks += count_;
+}
+
+void zmq::own_t::unregister_term_ack ()
+{
+    zmq_assert (term_acks > 0);
+    term_acks--;
+
+    //  This may be a last ack we are waiting for before termination...
+    check_term_acks (); 
+}
+
+void zmq::own_t::process_term_ack ()
+{
+    unregister_term_ack ();
+}
+
+void zmq::own_t::check_term_acks ()
+{
+    if (terminating && processed_seqnum == sent_seqnum.get () &&
+          term_acks == 0) {
+
+        //  Sanity check. There should be no active children at this point.
+        zmq_assert (owned.empty ());
+
+        //  The root object has nobody to confirm the termination to.
+        //  Other nodes will confirm the termination to the owner.
+        if (owner)
+            send_term_ack (owner);
+
+        //  Deallocate the resources.
+        process_destroy ();
+    }
+}
+
+void zmq::own_t::process_destroy ()
+{
+    delete this;
+}
+
diff --git a/src/own.hpp b/src/own.hpp
new file mode 100644
index 0000000..5023a30
--- /dev/null
+++ b/src/own.hpp
@@ -0,0 +1,140 @@
+/*
+    Copyright (c) 2007-2011 iMatix Corporation
+    Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
+
+    This file is part of 0MQ.
+
+    0MQ is free software; you can redistribute it and/or modify it under
+    the terms of the GNU Lesser General Public License as published by
+    the Free Software Foundation; either version 3 of the License, or
+    (at your option) any later version.
+
+    0MQ is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU Lesser General Public License for more details.
+
+    You should have received a copy of the GNU Lesser General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef __ZMQ_OWN_HPP_INCLUDED__
+#define __ZMQ_OWN_HPP_INCLUDED__
+
+#include <set>
+#include <algorithm>
+
+#include "object.hpp"
+#include "options.hpp"
+#include "atomic_counter.hpp"
+#include "stdint.hpp"
+
+namespace zmq
+{
+
+    //  Base class for objects forming a part of ownership hierarchy.
+    //  It handles initialisation and destruction of such objects.
+
+    class own_t : public object_t
+    {
+    public:
+
+        //  Note that the owner is unspecified in the constructor.
+        //  It'll be supplied later on when the object is plugged in.
+
+        //  The object is not living within an I/O thread. It has it's own
+        //  thread outside of 0MQ infrastructure.
+        own_t (class ctx_t *parent_, uint32_t tid_);
+
+        //  The object is living within I/O thread.
+        own_t (class io_thread_t *io_thread_, const options_t &options_);
+
+        //  When another owned object wants to send command to this object
+        //  it calls this function to let it know it should not shut down
+        //  before the command is delivered.
+        void inc_seqnum ();
+
+        //  Use following two functions to wait for arbitrary events before
+        //  terminating. Just add number of events to wait for using
+        //  register_tem_acks functions. When event occurs, call
+        //  remove_term_ack. When number of pending acks reaches zero
+        //  object will be deallocated.
+        void register_term_acks (int count_);
+        void unregister_term_ack ();
+
+    protected:
+
+        //  Launch the supplied object and become its owner.
+        void launch_child (own_t *object_);
+
+        //  Launch the supplied object and make it your sibling (make your
+        //  owner become its owner as well).
+        void launch_sibling (own_t *object_);
+
+        //  Ask owner object to terminate this object. It may take a while
+        //  while actual termination is started. This function should not be
+        //  called more than once.
+        void terminate ();
+
+        //  Derived object destroys own_t. There's no point in allowing
+        //  others to invoke the destructor. At the same time, it has to be
+        //  virtual so that generic own_t deallocation mechanism destroys
+        //  specific type of the owned object correctly.
+        virtual ~own_t ();
+
+        //  Term handler is protocted rather than private so that it can
+        //  be intercepted by the derived class. This is useful to add custom
+        //  steps to the beginning of the termination process.
+        void process_term (int linger_);
+
+        //  A place to hook in when phyicallal destruction of the object
+        //  is to be delayed.
+        virtual void process_destroy ();
+
+        //  Socket options associated with this object.
+        options_t options;
+
+    private:
+
+        //  Set owner of the object
+        void set_owner (own_t *owner_);
+
+        //  Handlers for incoming commands.
+        void process_own (own_t *object_);
+        void process_term_req (own_t *object_);
+        void process_term_ack ();
+        void process_seqnum ();
+
+        //  Check whether all the peding term acks were delivered.
+        //  If so, deallocate this object.
+        void check_term_acks ();
+
+        //  True if termination was already initiated. If so, we can destroy
+        //  the object if there are no more child objects or pending term acks.
+        bool terminating;
+
+        //  Sequence number of the last command sent to this object.
+        atomic_counter_t sent_seqnum;
+
+        //  Sequence number of the last command processed by this object.
+        uint64_t processed_seqnum;
+
+        //  Socket owning this object. It's responsible for shutting down
+        //  this object.
+        own_t *owner;
+
+        //  List of all objects owned by this socket. We are responsible
+        //  for deallocating them before we quit.
+        typedef std::set <own_t*> owned_t;
+        owned_t owned;
+
+        //  Number of events we have to get before we can destroy the object.
+        int term_acks;
+
+        own_t (const own_t&);
+        const own_t &operator = (const own_t&);
+    };
+
+}
+
+#endif
diff --git a/src/owned.cpp b/src/owned.cpp
deleted file mode 100644
index d6be444..0000000
--- a/src/owned.cpp
+++ /dev/null
@@ -1,71 +0,0 @@
-/*
-    Copyright (c) 2007-2010 iMatix Corporation
-
-    This file is part of 0MQ.
-
-    0MQ is free software; you can redistribute it and/or modify it under
-    the terms of the Lesser GNU General Public License as published by
-    the Free Software Foundation; either version 3 of the License, or
-    (at your option) any later version.
-
-    0MQ is distributed in the hope that it will be useful,
-    but WITHOUT ANY WARRANTY; without even the implied warranty of
-    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    Lesser GNU General Public License for more details.
-
-    You should have received a copy of the Lesser GNU General Public License
-    along with this program.  If not, see <http://www.gnu.org/licenses/>.
-*/
-
-#include "owned.hpp"
-#include "err.hpp"
-
-zmq::owned_t::owned_t (object_t *parent_, socket_base_t *owner_) :
-    object_t (parent_),
-    owner (owner_),
-    sent_seqnum (0),
-    processed_seqnum (0),
-    shutting_down (false)
-{
-}
-
-zmq::owned_t::~owned_t ()
-{
-}
-
-void zmq::owned_t::inc_seqnum ()
-{
-    //  NB: This function may be called from a different thread!
-    sent_seqnum.add (1);
-}
-
-void zmq::owned_t::term ()
-{
-    send_term_req (owner, this);
-}
-
-void zmq::owned_t::process_term ()
-{
-    zmq_assert (!shutting_down);
-    shutting_down = true;
-    finalise ();
-}
-
-void zmq::owned_t::process_seqnum ()
-{
-    //  Catch up with counter of processed commands.
-    processed_seqnum++;
-    finalise ();
-}
-
-void zmq::owned_t::finalise ()
-{
-    //  If termination request was already received and there are no more
-    //  commands to wait for, terminate the object.
-    if (shutting_down && processed_seqnum == sent_seqnum.get ()) {
-        process_unplug ();
-        send_term_ack (owner);
-        delete this;
-    }
-}
-
diff --git a/src/owned.hpp b/src/owned.hpp
deleted file mode 100644
index 91189a1..0000000
--- a/src/owned.hpp
+++ /dev/null
@@ -1,89 +0,0 @@
-/*
-    Copyright (c) 2007-2010 iMatix Corporation
-
-    This file is part of 0MQ.
-
-    0MQ is free software; you can redistribute it and/or modify it under
-    the terms of the Lesser GNU General Public License as published by
-    the Free Software Foundation; either version 3 of the License, or
-    (at your option) any later version.
-
-    0MQ is distributed in the hope that it will be useful,
-    but WITHOUT ANY WARRANTY; without even the implied warranty of
-    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    Lesser GNU General Public License for more details.
-
-    You should have received a copy of the Lesser GNU General Public License
-    along with this program.  If not, see <http://www.gnu.org/licenses/>.
-*/
-
-#ifndef __ZMQ_OWNED_HPP_INCLUDED__
-#define __ZMQ_OWNED_HPP_INCLUDED__
-
-#include "socket_base.hpp"
-#include "atomic_counter.hpp"
-#include "stdint.hpp"
-
-namespace zmq
-{
-
-    //  Base class for objects owned by individual sockets. Handles
-    //  initialisation and destruction of such objects.
-
-    class owned_t : public object_t
-    {
-    public:
-
-        //  The object will live in parent's thread, however, its lifetime
-        //  will be managed by its owner socket.
-        owned_t (object_t *parent_, socket_base_t *owner_);
-
-        //  When another owned object wants to send command to this object
-        //  it calls this function to let it know it should not shut down
-        //  before the command is delivered.
-        void inc_seqnum ();
-
-    protected:
-
-        //  Ask owner socket to terminate this object.
-        void term ();
-
-        //  Derived object destroys owned_t. No point in allowing others to
-        //  invoke the destructor. At the same time, it has to be virtual so
-        //  that generic owned_t deallocation mechanism destroys specific type
-        //  of the owned object correctly.
-        virtual ~owned_t ();
-
-        //  io_object_t defines a new handler used to disconnect the object
-        //  from the poller object. Implement the handlen in the derived
-        //  classes to ensure sane cleanup.
-        virtual void process_unplug () = 0;
-
-        //  Socket owning this object. When the socket is being closed it's
-        //  responsible for shutting down this object.
-        socket_base_t *owner;
-
-    private:
-
-        //  Handlers for incoming commands.
-        void process_term ();
-        void process_seqnum ();
-
-        void finalise ();
-
-        //  Sequence number of the last command sent to this object.
-        atomic_counter_t sent_seqnum;
-
-        //  Sequence number of the last command processed by this object.
-        uint64_t processed_seqnum;
-
-        //  If true, the object is already shutting down.
-        bool shutting_down;
-
-        owned_t (const owned_t&);
-        void operator = (const owned_t&);
-    };
-
-}
-
-#endif
diff --git a/src/pair.cpp b/src/pair.cpp
index 3872b28..1acc60f 100644
--- a/src/pair.cpp
+++ b/src/pair.cpp
@@ -1,19 +1,20 @@
 /*
-    Copyright (c) 2007-2010 iMatix Corporation
+    Copyright (c) 2007-2011 iMatix Corporation
+    Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
 
     This file is part of 0MQ.
 
     0MQ is free software; you can redistribute it and/or modify it under
-    the terms of the Lesser GNU General Public License as published by
+    the terms of the GNU Lesser General Public License as published by
     the Free Software Foundation; either version 3 of the License, or
     (at your option) any later version.
 
     0MQ is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    Lesser GNU General Public License for more details.
+    GNU Lesser General Public License for more details.
 
-    You should have received a copy of the Lesser GNU General Public License
+    You should have received a copy of the GNU Lesser General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
@@ -23,68 +24,96 @@
 #include "err.hpp"
 #include "pipe.hpp"
 
-zmq::pair_t::pair_t (class app_thread_t *parent_) :
-    socket_base_t (parent_),
+zmq::pair_t::pair_t (class ctx_t *parent_, uint32_t tid_) :
+    socket_base_t (parent_, tid_),
     inpipe (NULL),
     outpipe (NULL),
-    alive (true)
+    inpipe_alive (false),
+    outpipe_alive (false),
+    terminating (false)
 {
+    options.type = ZMQ_PAIR;
     options.requires_in = true;
     options.requires_out = true;
 }
 
 zmq::pair_t::~pair_t ()
 {
-    if (inpipe)
-        inpipe->term ();
-    if (outpipe)
-        outpipe->term ();
+    zmq_assert (!inpipe);
+    zmq_assert (!outpipe);
 }
 
-void zmq::pair_t::xattach_pipes (class reader_t *inpipe_,
-    class writer_t *outpipe_, const blob_t &peer_identity_)
+void zmq::pair_t::xattach_pipes (reader_t *inpipe_, writer_t *outpipe_,
+    const blob_t &peer_identity_)
 {
     zmq_assert (!inpipe && !outpipe);
+
     inpipe = inpipe_;
+    inpipe_alive = true;
+    inpipe->set_event_sink (this);
+
     outpipe = outpipe_;
     outpipe_alive = true;
+    outpipe->set_event_sink (this);
+
+    if (terminating) {
+        register_term_acks (2);
+        inpipe_->terminate ();
+        outpipe_->terminate ();
+    }
 }
 
-void zmq::pair_t::xdetach_inpipe (class reader_t *pipe_)
+void zmq::pair_t::terminated (reader_t *pipe_)
 {
     zmq_assert (pipe_ == inpipe);
     inpipe = NULL;
+    inpipe_alive = false;
+
+    if (terminating)
+        unregister_term_ack ();
 }
 
-void zmq::pair_t::xdetach_outpipe (class writer_t *pipe_)
+void zmq::pair_t::terminated (writer_t *pipe_)
 {
     zmq_assert (pipe_ == outpipe);
     outpipe = NULL;
+    outpipe_alive = false;
+
+    if (terminating)
+        unregister_term_ack ();
 }
 
-void zmq::pair_t::xkill (class reader_t *pipe_)
+void  zmq::pair_t::delimited (reader_t *pipe_)
 {
-    zmq_assert (alive);
-    alive = false;
 }
 
-void zmq::pair_t::xrevive (class reader_t *pipe_)
+void zmq::pair_t::process_term (int linger_)
 {
-    zmq_assert (!alive);
-    alive = true;
+    terminating = true;
+
+    if (inpipe) {
+        register_term_acks (1);
+        inpipe->terminate ();
+    }
+
+    if (outpipe) {
+        register_term_acks (1);
+        outpipe->terminate ();
+    }
+
+    socket_base_t::process_term (linger_);
 }
 
-void zmq::pair_t::xrevive (class writer_t *pipe_)
+void zmq::pair_t::activated (class reader_t *pipe_)
 {
-    zmq_assert (!outpipe_alive);
-    outpipe_alive = true;
+    zmq_assert (!inpipe_alive);
+    inpipe_alive = true;
 }
 
-int zmq::pair_t::xsetsockopt (int option_, const void *optval_,
-    size_t optvallen_)
+void zmq::pair_t::activated (class writer_t *pipe_)
 {
-    errno = EINVAL;
-    return -1;
+    zmq_assert (!outpipe_alive);
+    outpipe_alive = true;
 }
 
 int zmq::pair_t::xsend (zmq_msg_t *msg_, int flags_)
@@ -100,7 +129,8 @@ int zmq::pair_t::xsend (zmq_msg_t *msg_, int flags_)
         return -1;
     }
 
-    outpipe->flush ();
+    if (!(flags_ & ZMQ_SNDMORE))
+        outpipe->flush ();
 
     //  Detach the original message from the data buffer.
     int rc = zmq_msg_init (msg_);
@@ -114,9 +144,12 @@ int zmq::pair_t::xrecv (zmq_msg_t *msg_, int flags_)
     //  Deallocate old content of the message.
     zmq_msg_close (msg_);
 
-    if (!alive || !inpipe || !inpipe->read (msg_)) {
-        //  No message is available. Initialise the output parameter
-        //  to be a 0-byte message.
+    if (!inpipe_alive || !inpipe || !inpipe->read (msg_)) {
+
+        //  No message is available.
+        inpipe_alive = false;
+
+        //  Initialise the output parameter to be a 0-byte message.
         zmq_msg_init (msg_);
         errno = EAGAIN;
         return -1;
@@ -126,17 +159,22 @@ int zmq::pair_t::xrecv (zmq_msg_t *msg_, int flags_)
 
 bool zmq::pair_t::xhas_in ()
 {
-    if (alive && inpipe && inpipe->check_read ())
-        return true;
-    return false;
+    if (!inpipe || !inpipe_alive)
+        return false;
+
+    inpipe_alive = inpipe->check_read ();
+    return inpipe_alive;
 }
 
 bool zmq::pair_t::xhas_out ()
 {
-    if (outpipe == NULL || !outpipe_alive)
+    if (!outpipe || !outpipe_alive)
         return false;
 
-    outpipe_alive = outpipe->check_write ();
+    zmq_msg_t msg;
+    zmq_msg_init (&msg);
+    outpipe_alive = outpipe->check_write (&msg);
+    zmq_msg_close (&msg);
     return outpipe_alive;
 }
 
diff --git a/src/pair.hpp b/src/pair.hpp
index aea249f..54e60b5 100644
--- a/src/pair.hpp
+++ b/src/pair.hpp
@@ -1,19 +1,20 @@
 /*
-    Copyright (c) 2007-2010 iMatix Corporation
+    Copyright (c) 2007-2011 iMatix Corporation
+    Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
 
     This file is part of 0MQ.
 
     0MQ is free software; you can redistribute it and/or modify it under
-    the terms of the Lesser GNU General Public License as published by
+    the terms of the GNU Lesser General Public License as published by
     the Free Software Foundation; either version 3 of the License, or
     (at your option) any later version.
 
     0MQ is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    Lesser GNU General Public License for more details.
+    GNU Lesser General Public License for more details.
 
-    You should have received a copy of the Lesser GNU General Public License
+    You should have received a copy of the GNU Lesser General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
@@ -21,41 +22,53 @@
 #define __ZMQ_PAIR_HPP_INCLUDED__
 
 #include "socket_base.hpp"
+#include "pipe.hpp"
 
 namespace zmq
 {
 
-    class pair_t : public socket_base_t
+    class pair_t :
+        public socket_base_t,
+        public i_reader_events,
+        public i_writer_events
     {
     public:
 
-        pair_t (class app_thread_t *parent_);
+        pair_t (class ctx_t *parent_, uint32_t tid_);
         ~pair_t ();
 
         //  Overloads of functions from socket_base_t.
         void xattach_pipes (class reader_t *inpipe_, class writer_t *outpipe_,
             const blob_t &peer_identity_);
-        void xdetach_inpipe (class reader_t *pipe_);
-        void xdetach_outpipe (class writer_t *pipe_);
-        void xkill (class reader_t *pipe_);
-        void xrevive (class reader_t *pipe_);
-        void xrevive (class writer_t *pipe_);
-        int xsetsockopt (int option_, const void *optval_, size_t optvallen_);
         int xsend (zmq_msg_t *msg_, int flags_);
         int xrecv (zmq_msg_t *msg_, int flags_);
         bool xhas_in ();
         bool xhas_out ();
 
+        //  i_reader_events interface implementation.
+        void activated (class reader_t *pipe_);
+        void terminated (class reader_t *pipe_);
+        void delimited (class reader_t *pipe_);
+
+        //  i_writer_events interface implementation.
+        void activated (class writer_t *pipe_);
+        void terminated (class writer_t *pipe_);
+
     private:
 
+        //  Hook into termination process.
+        void process_term (int linger_);
+
         class reader_t *inpipe;
         class writer_t *outpipe;
 
-        bool alive;
+        bool inpipe_alive;
         bool outpipe_alive;
 
+        bool terminating;
+
         pair_t (const pair_t&);
-        void operator = (const pair_t&);
+        const pair_t &operator = (const pair_t&);
     };
 
 }
diff --git a/src/pgm_receiver.cpp b/src/pgm_receiver.cpp
index 048c529..4fadadc 100644
--- a/src/pgm_receiver.cpp
+++ b/src/pgm_receiver.cpp
@@ -1,19 +1,20 @@
 /*
-    Copyright (c) 2007-2010 iMatix Corporation
+    Copyright (c) 2007-2011 iMatix Corporation
+    Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
 
     This file is part of 0MQ.
 
     0MQ is free software; you can redistribute it and/or modify it under
-    the terms of the Lesser GNU General Public License as published by
+    the terms of the GNU Lesser General Public License as published by
     the Free Software Foundation; either version 3 of the License, or
     (at your option) any later version.
 
     0MQ is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    Lesser GNU General Public License for more details.
+    GNU Lesser General Public License for more details.
 
-    You should have received a copy of the Lesser GNU General Public License
+    You should have received a copy of the GNU Lesser General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
@@ -36,6 +37,7 @@
 zmq::pgm_receiver_t::pgm_receiver_t (class io_thread_t *parent_, 
       const options_t &options_) :
     io_object_t (parent_),
+    has_rx_timer (false),
     pgm_socket (true, options_),
     options (options_),
     inout (NULL),
@@ -55,7 +57,7 @@ int zmq::pgm_receiver_t::init (bool udp_encapsulation_, const char *network_)
     return pgm_socket.init (udp_encapsulation_, network_);
 }
 
-void zmq::pgm_receiver_t::plug (i_inout *inout_)
+void zmq::pgm_receiver_t::plug (io_thread_t *io_thread_, i_inout *inout_)
 {
     //  Retrieve PGM fds and start polling.
     int socket_fd;
@@ -72,7 +74,7 @@ void zmq::pgm_receiver_t::plug (i_inout *inout_)
 void zmq::pgm_receiver_t::unplug ()
 {
     //  Delete decoders.
-    for (peers_t::iterator it = peers.begin (); it != peers.end (); it++) {
+    for (peers_t::iterator it = peers.begin (); it != peers.end (); ++it) {
         if (it->second.decoder != NULL)
             delete it->second.decoder;
     }
@@ -81,19 +83,29 @@ void zmq::pgm_receiver_t::unplug ()
     mru_decoder = NULL;
     pending_bytes = 0;
 
-    //  Stop polling.
+    if (has_rx_timer) {
+        cancel_timer (rx_timer_id);
+        has_rx_timer = false;
+    }
+
     rm_fd (socket_handle);
     rm_fd (pipe_handle);
 
     inout = NULL;
 }
 
-void zmq::pgm_receiver_t::revive ()
+void zmq::pgm_receiver_t::terminate ()
+{
+    unplug ();
+    delete this;
+}
+
+void zmq::pgm_receiver_t::activate_out ()
 {
     zmq_assert (false);
 }
 
-void zmq::pgm_receiver_t::resume_input ()
+void zmq::pgm_receiver_t::activate_in ()
 {
     //  It is possible that the most recently used decoder
     //  processed the whole buffer but failed to write
@@ -129,17 +141,31 @@ void zmq::pgm_receiver_t::in_event ()
 
     zmq_assert (pending_bytes == 0);
 
+    if (has_rx_timer) {
+        cancel_timer (rx_timer_id);
+        has_rx_timer = false;
+    }
+
     //  TODO: This loop can effectively block other engines in the same I/O
     //  thread in the case of high load.
     while (true) {
 
         //  Get new batch of data.
-        ssize_t received = pgm_socket.receive ((void**) &data, &tsi);
+        //  Note the workaround made not to break strict-aliasing rules.
+        void *tmp = NULL;
+        ssize_t received = pgm_socket.receive (&tmp, &tsi);
+        data = (unsigned char*) tmp;
 
         //  No data to process. This may happen if the packet received is
         //  neither ODATA nor ODATA.
-        if (received == 0)
+        if (received == 0) {
+            if (errno == ENOMEM || errno == EBUSY) {
+                const long timeout = pgm_socket.get_rx_timeout ();
+                add_timer (timeout, rx_timer_id);
+                has_rx_timer = true;
+            }
             break;
+        }
 
         //  Find the peer based on its TSI.
         peers_t::iterator it = peers.find (*tsi);
@@ -161,7 +187,7 @@ void zmq::pgm_receiver_t::in_event ()
         //  New peer. Add it to the list of know but unjoint peers.
         if (it == peers.end ()) {
             peer_info_t peer_info = {false, NULL};
-            it = peers.insert (std::make_pair (*tsi, peer_info)).first;
+            it = peers.insert (peers_t::value_type (*tsi, peer_info)).first;
         }
 
         //  Read the offset of the fist message in the current packet.
@@ -189,7 +215,8 @@ void zmq::pgm_receiver_t::in_event ()
             it->second.joined = true;
 
             //  Create and connect decoder for the peer.
-            it->second.decoder = new (std::nothrow) zmq_decoder_t (0);
+            it->second.decoder = new (std::nothrow) decoder_t (0);
+            alloc_assert (it->second.decoder);
             it->second.decoder->set_inout (inout);
         }
 
@@ -205,6 +232,12 @@ void zmq::pgm_receiver_t::in_event ()
             reset_pollin (pipe_handle);
             reset_pollin (socket_handle);
 
+            //  Reset outstanding timer.
+            if (has_rx_timer) {
+                cancel_timer (rx_timer_id);
+                has_rx_timer = false;
+            }
+
             break;
         }
     }
@@ -213,5 +246,14 @@ void zmq::pgm_receiver_t::in_event ()
     inout->flush ();
 }
 
+void zmq::pgm_receiver_t::timer_event (int token)
+{
+    zmq_assert (token == rx_timer_id);
+
+    //  Timer cancels on return by poller_base.
+    has_rx_timer = false;
+    in_event ();
+}
+
 #endif
 
diff --git a/src/pgm_receiver.hpp b/src/pgm_receiver.hpp
index 1b367bf..172557f 100644
--- a/src/pgm_receiver.hpp
+++ b/src/pgm_receiver.hpp
@@ -1,19 +1,20 @@
 /*
-    Copyright (c) 2007-2010 iMatix Corporation
+    Copyright (c) 2007-2011 iMatix Corporation
+    Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
 
     This file is part of 0MQ.
 
     0MQ is free software; you can redistribute it and/or modify it under
-    the terms of the Lesser GNU General Public License as published by
+    the terms of the GNU Lesser General Public License as published by
     the Free Software Foundation; either version 3 of the License, or
     (at your option) any later version.
 
     0MQ is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    Lesser GNU General Public License for more details.
+    GNU Lesser General Public License for more details.
 
-    You should have received a copy of the Lesser GNU General Public License
+    You should have received a copy of the GNU Lesser General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
@@ -34,7 +35,7 @@
 #include "io_object.hpp"
 #include "i_engine.hpp"
 #include "options.hpp"
-#include "zmq_decoder.hpp"
+#include "decoder.hpp"
 #include "pgm_socket.hpp"
 
 namespace zmq
@@ -51,36 +52,42 @@ namespace zmq
         int init (bool udp_encapsulation_, const char *network_);
 
         //  i_engine interface implementation.
-        void plug (struct i_inout *inout_);
+        void plug (class io_thread_t *io_thread_, struct i_inout *inout_);
         void unplug ();
-        void revive ();
-        void resume_input ();
+        void terminate ();
+        void activate_in ();
+        void activate_out ();
 
         //  i_poll_events interface implementation.
         void in_event ();
+        void timer_event (int token);
 
     private:
 
+        //  RX timeout timer ID.
+        enum {rx_timer_id = 0xa1};
+
+        //  RX timer is running.
+        bool has_rx_timer;
+
         //  If joined is true we are already getting messages from the peer.
         //  It it's false, we are getting data but still we haven't seen
         //  beginning of a message.
         struct peer_info_t
         {
             bool joined;
-            zmq_decoder_t *decoder;
+            decoder_t *decoder;
         };
 
         struct tsi_comp
         {
-            inline bool operator () (const pgm_tsi_t &ltsi,
+            bool operator () (const pgm_tsi_t &ltsi,
                 const pgm_tsi_t &rtsi) const
             {
-                if (ltsi.sport < rtsi.sport)
-                    return true;
-
-                return (std::lexicographical_compare (ltsi.gsi.identifier, 
-                    ltsi.gsi.identifier + 6, 
-                    rtsi.gsi.identifier, rtsi.gsi.identifier + 6));
+                uint32_t ll[2], rl[2];
+                memcpy (ll, &ltsi, sizeof (ll));
+                memcpy (rl, &rtsi, sizeof (rl));
+                return (ll[0] < rl[0]) || (ll[0] == rl[0] && ll[1] < rl[1]);
             }
         };
 
@@ -97,7 +104,7 @@ namespace zmq
         i_inout *inout;
 
         //  Most recently used decoder.
-        zmq_decoder_t *mru_decoder;
+        decoder_t *mru_decoder;
 
         //  Number of bytes not consumed by the decoder due to pipe overflow.
         size_t pending_bytes;
@@ -112,7 +119,7 @@ namespace zmq
         handle_t pipe_handle;
 
         pgm_receiver_t (const pgm_receiver_t&);
-        void operator = (const pgm_receiver_t&);
+        const pgm_receiver_t &operator = (const pgm_receiver_t&);
     };
 
 }
diff --git a/src/pgm_sender.cpp b/src/pgm_sender.cpp
index 9aeb7a9..4d76433 100644
--- a/src/pgm_sender.cpp
+++ b/src/pgm_sender.cpp
@@ -1,19 +1,20 @@
 /*
-    Copyright (c) 2007-2010 iMatix Corporation
+    Copyright (c) 2007-2011 iMatix Corporation
+    Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
 
     This file is part of 0MQ.
 
     0MQ is free software; you can redistribute it and/or modify it under
-    the terms of the Lesser GNU General Public License as published by
+    the terms of the GNU Lesser General Public License as published by
     the Free Software Foundation; either version 3 of the License, or
     (at your option) any later version.
 
     0MQ is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    Lesser GNU General Public License for more details.
+    GNU Lesser General Public License for more details.
 
-    You should have received a copy of the Lesser GNU General Public License
+    You should have received a copy of the GNU Lesser General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
@@ -36,6 +37,8 @@
 zmq::pgm_sender_t::pgm_sender_t (io_thread_t *parent_, 
       const options_t &options_) :
     io_object_t (parent_),
+    has_tx_timer (false),
+    has_rx_timer (false),
     encoder (0),
     pgm_socket (false, options_),
     options (options_),
@@ -53,12 +56,12 @@ int zmq::pgm_sender_t::init (bool udp_encapsulation_, const char *network_)
 
     out_buffer_size = pgm_socket.get_max_tsdu_size ();
     out_buffer = (unsigned char*) malloc (out_buffer_size);
-    zmq_assert (out_buffer);
+    alloc_assert (out_buffer);
 
     return rc;
 }
 
-void zmq::pgm_sender_t::plug (i_inout *inout_)
+void zmq::pgm_sender_t::plug (io_thread_t *io_thread_, i_inout *inout_)
 {
     //  Alocate 2 fds for PGM socket.
     int downlink_socket_fd = 0;
@@ -89,6 +92,16 @@ void zmq::pgm_sender_t::plug (i_inout *inout_)
 
 void zmq::pgm_sender_t::unplug ()
 {
+    if (has_rx_timer) {
+        cancel_timer (rx_timer_id);
+        has_rx_timer = false;
+    }
+
+    if (has_tx_timer) {
+        cancel_timer (tx_timer_id);
+        has_tx_timer = false;
+    }
+
     rm_fd (handle);
     rm_fd (uplink_handle);
     rm_fd (rdata_notify_handle);
@@ -96,13 +109,19 @@ void zmq::pgm_sender_t::unplug ()
     encoder.set_inout (NULL);
 }
 
-void zmq::pgm_sender_t::revive ()
+void zmq::pgm_sender_t::terminate ()
+{
+    unplug ();
+    delete this;
+}
+
+void zmq::pgm_sender_t::activate_out ()
 {
     set_pollout (handle);
     out_event ();
 }
 
-void zmq::pgm_sender_t::resume_input ()
+void zmq::pgm_sender_t::activate_in ()
 {
     zmq_assert (false);
 }
@@ -117,8 +136,18 @@ zmq::pgm_sender_t::~pgm_sender_t ()
 
 void zmq::pgm_sender_t::in_event ()
 {
-    //  In event on sender side means NAK or SPMR receiving from some peer.
+    if (has_rx_timer) {
+        cancel_timer (rx_timer_id);
+        has_rx_timer = false;
+    }
+
+    //  In-event on sender side means NAK or SPMR receiving from some peer.
     pgm_socket.process_upstream ();
+    if (errno == ENOMEM || errno == EBUSY) {
+        const long timeout = pgm_socket.get_rx_timeout ();
+        add_timer (timeout, rx_timer_id);
+        has_rx_timer = true;
+    }
 }
 
 void zmq::pgm_sender_t::out_event ()
@@ -146,14 +175,40 @@ void zmq::pgm_sender_t::out_event ()
         put_uint16 (out_buffer, offset == -1 ? 0xffff : (uint16_t) offset);
     }
 
+    if (has_tx_timer) {
+        cancel_timer (tx_timer_id);
+        has_tx_timer = false;
+    }
+
     //  Send the data.
     size_t nbytes = pgm_socket.send (out_buffer, write_size);
 
     //  We can write either all data or 0 which means rate limit reached.
-    if (nbytes == write_size)
+    if (nbytes == write_size) {
         write_size = 0;
-    else
+    } else {
         zmq_assert (nbytes == 0);
+
+        if (errno == ENOMEM) {
+            const long timeout = pgm_socket.get_tx_timeout ();
+            add_timer (timeout, tx_timer_id);
+            has_tx_timer = true;
+        } else
+            zmq_assert (errno == EBUSY);
+    }
+}
+
+void zmq::pgm_sender_t::timer_event (int token)
+{
+    //  Timer cancels on return by poller_base.
+    if (token == rx_timer_id) {
+        has_rx_timer = false;
+        in_event ();
+    } else if (token == tx_timer_id) {
+        has_tx_timer = false;
+        out_event ();
+    } else
+        zmq_assert (false);
 }
 
 #endif
diff --git a/src/pgm_sender.hpp b/src/pgm_sender.hpp
index 23a53bc..4a21b3f 100644
--- a/src/pgm_sender.hpp
+++ b/src/pgm_sender.hpp
@@ -1,19 +1,20 @@
 /*
-    Copyright (c) 2007-2010 iMatix Corporation
+    Copyright (c) 2007-2011 iMatix Corporation
+    Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
 
     This file is part of 0MQ.
 
     0MQ is free software; you can redistribute it and/or modify it under
-    the terms of the Lesser GNU General Public License as published by
+    the terms of the GNU Lesser General Public License as published by
     the Free Software Foundation; either version 3 of the License, or
     (at your option) any later version.
 
     0MQ is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    Lesser GNU General Public License for more details.
+    GNU Lesser General Public License for more details.
 
-    You should have received a copy of the Lesser GNU General Public License
+    You should have received a copy of the GNU Lesser General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
@@ -33,7 +34,7 @@
 #include "i_engine.hpp"
 #include "options.hpp"
 #include "pgm_socket.hpp"
-#include "zmq_encoder.hpp"
+#include "encoder.hpp"
 
 namespace zmq
 {
@@ -49,19 +50,28 @@ namespace zmq
         int init (bool udp_encapsulation_, const char *network_);
 
         //  i_engine interface implementation.
-        void plug (struct i_inout *inout_);
+        void plug (class io_thread_t *io_thread_, struct i_inout *inout_);
         void unplug ();
-        void revive ();
-        void resume_input ();
+        void terminate ();
+        void activate_in ();
+        void activate_out ();
 
         //  i_poll_events interface implementation.
         void in_event ();
         void out_event ();
+        void timer_event (int token);
 
     private:
 
+        //  TX and RX timeout timer ID's.
+        enum {tx_timer_id = 0xa0, rx_timer_id = 0xa1};
+
+        //  Timers are running.
+        bool has_tx_timer;
+        bool has_rx_timer;
+
         //  Message encoder.
-        zmq_encoder_t encoder;
+        encoder_t encoder;
 
         //  PGM socket.
         pgm_socket_t pgm_socket;
@@ -86,7 +96,7 @@ namespace zmq
         size_t write_size;
 
         pgm_sender_t (const pgm_sender_t&);
-        void operator = (const pgm_sender_t&);
+        const pgm_sender_t &operator = (const pgm_sender_t&);
     };
 
 }
diff --git a/src/pgm_socket.cpp b/src/pgm_socket.cpp
index 5a952a7..5a82907 100644
--- a/src/pgm_socket.cpp
+++ b/src/pgm_socket.cpp
@@ -1,19 +1,20 @@
 /*
-    Copyright (c) 2007-2010 iMatix Corporation
+    Copyright (c) 2007-2011 iMatix Corporation
+    Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
 
     This file is part of 0MQ.
 
     0MQ is free software; you can redistribute it and/or modify it under
-    the terms of the Lesser GNU General Public License as published by
+    the terms of the GNU Lesser General Public License as published by
     the Free Software Foundation; either version 3 of the License, or
     (at your option) any later version.
 
     0MQ is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    Lesser GNU General Public License for more details.
+    GNU Lesser General Public License for more details.
 
-    You should have received a copy of the Lesser GNU General Public License
+    You should have received a copy of the GNU Lesser General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
@@ -40,8 +41,12 @@
 #include "uuid.hpp"
 #include "stdint.hpp"
 
+#ifndef MSG_ERRQUEUE
+#define MSG_ERRQUEUE 0x2000
+#endif
+
 zmq::pgm_socket_t::pgm_socket_t (bool receiver_, const options_t &options_) :
-    transport (NULL),
+    sock (NULL),
     options (options_),
     receiver (receiver_),
     pgm_msgv (NULL),
@@ -52,13 +57,18 @@ zmq::pgm_socket_t::pgm_socket_t (bool receiver_, const options_t &options_) :
 {
 }
 
+//  Create, bind and connect PGM socket.
+//  network_ of the form <interface & multicast group decls>:<IP port>
+//  e.g. eth0;239.192.0.1:7500
+//       link-local;224.250.0.1,224.250.0.2;224.250.0.3:8000
+//       ;[fe80::1%en0]:7500
 int zmq::pgm_socket_t::init (bool udp_encapsulation_, const char *network_)
 {
     //  Can not open transport before destroying old one. 
-    zmq_assert (transport == NULL);
+    zmq_assert (sock == NULL);
  
-    //  Parse port number.
-    const char *port_delim = strchr (network_, ':');
+    //  Parse port number, start from end for IPv6
+    const char *port_delim = strrchr (network_, ':');
     if (!port_delim) {
         errno = EINVAL;
         return -1;
@@ -73,261 +83,276 @@ int zmq::pgm_socket_t::init (bool udp_encapsulation_, const char *network_)
     }
     memset (network, '\0', sizeof (network));
     memcpy (network, network_, port_delim - network_);
-    
+   
+    //  Validate socket options 
+    //  Data rate is in [B/s]. options.rate is in [kb/s].
+    if (options.rate <= 0) {
+        errno = EINVAL;
+        return -1;
+    }
+    //  Recovery interval [s] or [ms] - based on the user's call 
+    if ((options.recovery_ivl <= 0) && (options.recovery_ivl_msec <= 0)) {
+        errno = EINVAL;
+        return -1;
+    }
+
     //  Zero counter used in msgrecv.
     nbytes_rec = 0;
     nbytes_processed = 0;
     pgm_msgv_processed = 0;
 
-    int rc;
-    GError *pgm_error = NULL;
+    pgm_error_t *pgm_error = NULL;
+    struct pgm_addrinfo_t hints, *res = NULL;
+    sa_family_t sa_family;
 
-    //  PGM transport GSI.
-    pgm_gsi_t gsi;
- 
-    std::string gsi_base;
-
-    if (options.identity.size () > 0) {
-
-        //  Create gsi from identity.
-        //  TODO: We assume that identity is standard C string here.
-        //  What if it contains binary zeroes?
-        gsi_base.assign ((const char*) options.identity.data (),
-            options.identity.size ());
-    } else {
+    memset (&hints, 0, sizeof (hints));
+    hints.ai_family = AF_UNSPEC;
+    if (!pgm_getaddrinfo (network, NULL, &res, &pgm_error)) {
 
-        //  Generate random gsi.
-        gsi_base = uuid_t ().to_string ();
-    }
+        //  Invalid parameters don't set pgm_error_t.
+        zmq_assert (pgm_error != NULL);
+        if (pgm_error->domain == PGM_ERROR_DOMAIN_IF && (
 
-    rc = pgm_gsi_create_from_string (&gsi, gsi_base.c_str (), -1);
-    if (rc != TRUE) {
-        errno = EINVAL;
-        return -1;
-    }
+              //  NB: cannot catch EAI_BADFLAGS.
+              pgm_error->code != PGM_ERROR_SERVICE &&
+              pgm_error->code != PGM_ERROR_SOCKTNOSUPPORT))
 
-    struct pgm_transport_info_t *res = NULL;
-    struct pgm_transport_info_t hint;
-    memset (&hint, 0, sizeof (hint));
-    hint.ti_family = AF_INET;
-    
-    if (!pgm_if_get_transport_info (network, &hint, &res, &pgm_error)) {
-        if (pgm_error->domain == PGM_IF_ERROR && (
-              pgm_error->code == PGM_IF_ERROR_INVAL ||
-              pgm_error->code == PGM_IF_ERROR_XDEV ||
-              pgm_error->code == PGM_IF_ERROR_NODEV ||
-              pgm_error->code == PGM_IF_ERROR_NOTUNIQ ||
-              pgm_error->code == PGM_IF_ERROR_ADDRFAMILY ||
-              pgm_error->code == PGM_IF_ERROR_FAMILY ||
-              pgm_error->code == PGM_IF_ERROR_NODATA ||
-              pgm_error->code == PGM_IF_ERROR_NONAME ||
-              pgm_error->code == PGM_IF_ERROR_SERVICE)) {
-            g_error_free (pgm_error);
-            errno = EINVAL;
-            return -1;
-        }
+            //  User, host, or network configuration or transient error.
+            goto err_abort;
 
+        //  Fatal OpenPGM internal error.
         zmq_assert (false);
     }
 
-    res->ti_gsi = gsi;
-    res->ti_dport = port_number;
+    zmq_assert (res != NULL);
 
-    //  If we are using UDP encapsulation update gsr or res. 
-    if (udp_encapsulation_) {
-        res->ti_udp_encap_ucast_port = port_number;
-        res->ti_udp_encap_mcast_port = port_number;
-    }
+    //  Pick up detected IP family.
+    sa_family = res->ai_send_addrs[0].gsr_group.ss_family;
 
-    if (!pgm_transport_create (&transport, res, &pgm_error)) {
-        if (pgm_error->domain == PGM_TRANSPORT_ERROR && (
-              pgm_error->code == PGM_TRANSPORT_ERROR_INVAL ||
-              pgm_error->code == PGM_TRANSPORT_ERROR_PERM ||
-              pgm_error->code == PGM_TRANSPORT_ERROR_NODEV)) {
-            pgm_if_free_transport_info (res);
-            g_error_free (pgm_error);
-            errno = EINVAL;
-            return -1;
+    //  Create IP/PGM or UDP/PGM socket.
+    if (udp_encapsulation_) {
+        if (!pgm_socket (&sock, sa_family, SOCK_SEQPACKET, IPPROTO_UDP,
+              &pgm_error)) {
+
+            //  Invalid parameters don't set pgm_error_t.
+            zmq_assert (pgm_error != NULL);
+            if (pgm_error->domain == PGM_ERROR_DOMAIN_SOCKET && (
+                  pgm_error->code != PGM_ERROR_BADF &&
+                  pgm_error->code != PGM_ERROR_FAULT &&
+                  pgm_error->code != PGM_ERROR_NOPROTOOPT &&
+                  pgm_error->code != PGM_ERROR_FAILED))
+
+                //  User, host, or network configuration or transient error.
+                goto err_abort;
+
+            //  Fatal OpenPGM internal error.
+            zmq_assert (false);
         }
 
-        zmq_assert (false);
+        //  All options are of data type int
+        const int encapsulation_port = port_number;
+        if (!pgm_setsockopt (sock, IPPROTO_PGM, PGM_UDP_ENCAP_UCAST_PORT,
+                &encapsulation_port, sizeof (encapsulation_port)))
+            goto err_abort;
+        if (!pgm_setsockopt (sock, IPPROTO_PGM, PGM_UDP_ENCAP_MCAST_PORT,
+                &encapsulation_port, sizeof (encapsulation_port)))
+            goto err_abort;
     }
-
-    pgm_if_free_transport_info (res);
-
-    //  Common parameters for receiver and sender.
-
-    //  Set maximum transport protocol data unit size (TPDU).
-    rc = pgm_transport_set_max_tpdu (transport, pgm_max_tpdu);
-    if (rc != TRUE) {
-        errno = EINVAL;
-        return -1;
+    else {
+        if (!pgm_socket (&sock, sa_family, SOCK_SEQPACKET, IPPROTO_PGM,
+              &pgm_error)) {
+
+            //  Invalid parameters don't set pgm_error_t.
+            zmq_assert (pgm_error != NULL);
+            if (pgm_error->domain == PGM_ERROR_DOMAIN_SOCKET && (
+                  pgm_error->code != PGM_ERROR_BADF &&
+                  pgm_error->code != PGM_ERROR_FAULT &&
+                  pgm_error->code != PGM_ERROR_NOPROTOOPT &&
+                  pgm_error->code != PGM_ERROR_FAILED))
+
+                //  User, host, or network configuration or transient error.
+                goto err_abort;
+
+            //  Fatal OpenPGM internal error.
+            zmq_assert (false);
+        }
     }
 
-    //  Set maximum number of network hops to cross.
-    rc = pgm_transport_set_hops (transport, 16);
-    if (rc != TRUE) {
-        errno = EINVAL;
-        return -1;
-    }
+    {
+        const int rcvbuf = (int) options.rcvbuf,
+                  sndbuf = (int) options.sndbuf,
+                  max_tpdu = (int) pgm_max_tpdu;
+        if (rcvbuf) {
+            if (!pgm_setsockopt (sock, SOL_SOCKET, SO_RCVBUF, &rcvbuf,
+                  sizeof (rcvbuf)))
+                goto err_abort;
+        }
+        if (sndbuf) {
+            if (!pgm_setsockopt (sock, SOL_SOCKET, SO_SNDBUF, &sndbuf,
+                  sizeof (sndbuf)))
+                goto err_abort;
+        }
 
-    //  Set nonblocking send/recv sockets.
-    if (!pgm_transport_set_nonblocking (transport, true)) {
-        errno = EINVAL;
-        return -1;
+        //  Set maximum transport protocol data unit size (TPDU).
+        if (!pgm_setsockopt (sock, IPPROTO_PGM, PGM_MTU, &max_tpdu,
+              sizeof (max_tpdu)))
+            goto err_abort;
     }
 
     if (receiver) {
+        const int recv_only        = 1,
+                  rxw_max_tpdu     = (int) pgm_max_tpdu,
+                  rxw_sqns         = compute_sqns (rxw_max_tpdu),
+                  peer_expiry      = pgm_secs (300),
+                  spmr_expiry      = pgm_msecs (25),
+                  nak_bo_ivl       = pgm_msecs (50),
+                  nak_rpt_ivl      = pgm_msecs (200),
+                  nak_rdata_ivl    = pgm_msecs (200),
+                  nak_data_retries = 50,
+                  nak_ncf_retries  = 50;
+
+        if (!pgm_setsockopt (sock, IPPROTO_PGM, PGM_RECV_ONLY, &recv_only,
+                sizeof (recv_only)) ||
+            !pgm_setsockopt (sock, IPPROTO_PGM, PGM_RXW_SQNS, &rxw_sqns,
+                sizeof (rxw_sqns)) ||
+            !pgm_setsockopt (sock, IPPROTO_PGM, PGM_PEER_EXPIRY, &peer_expiry,
+                sizeof (peer_expiry)) ||
+            !pgm_setsockopt (sock, IPPROTO_PGM, PGM_SPMR_EXPIRY, &spmr_expiry,
+                sizeof (spmr_expiry)) ||
+            !pgm_setsockopt (sock, IPPROTO_PGM, PGM_NAK_BO_IVL, &nak_bo_ivl,
+                sizeof (nak_bo_ivl)) ||
+            !pgm_setsockopt (sock, IPPROTO_PGM, PGM_NAK_RPT_IVL, &nak_rpt_ivl,
+                sizeof (nak_rpt_ivl)) ||
+            !pgm_setsockopt (sock, IPPROTO_PGM, PGM_NAK_RDATA_IVL,
+                &nak_rdata_ivl, sizeof (nak_rdata_ivl)) ||
+            !pgm_setsockopt (sock, IPPROTO_PGM, PGM_NAK_DATA_RETRIES,
+                &nak_data_retries, sizeof (nak_data_retries)) ||
+            !pgm_setsockopt (sock, IPPROTO_PGM, PGM_NAK_NCF_RETRIES,
+                &nak_ncf_retries, sizeof (nak_ncf_retries)))
+            goto err_abort;
+    } else {
+        const int send_only        = 1,
+                  max_rte          = (int) ((options.rate * 1000) / 8),
+                  txw_max_tpdu     = (int) pgm_max_tpdu,
+                  txw_sqns         = compute_sqns (txw_max_tpdu),
+                  ambient_spm      = pgm_secs (30),
+                  heartbeat_spm[]  = { pgm_msecs (100),
+                                       pgm_msecs (100),
+                                       pgm_msecs (100),
+                                       pgm_msecs (100),
+                                       pgm_msecs (1300),
+                                       pgm_secs  (7),
+                                       pgm_secs  (16),
+                                       pgm_secs  (25),
+                                       pgm_secs  (30) };
+
+        if (!pgm_setsockopt (sock, IPPROTO_PGM, PGM_SEND_ONLY,
+                &send_only, sizeof (send_only)) ||
+            !pgm_setsockopt (sock, IPPROTO_PGM, PGM_ODATA_MAX_RTE,
+                &max_rte, sizeof (max_rte)) ||
+            !pgm_setsockopt (sock, IPPROTO_PGM, PGM_TXW_SQNS,
+                &txw_sqns, sizeof (txw_sqns)) ||
+            !pgm_setsockopt (sock, IPPROTO_PGM, PGM_AMBIENT_SPM,
+                &ambient_spm, sizeof (ambient_spm)) ||
+            !pgm_setsockopt (sock, IPPROTO_PGM, PGM_HEARTBEAT_SPM,
+                &heartbeat_spm, sizeof (heartbeat_spm)))
+            goto err_abort;
+    }
 
-        //  Receiver transport.
-        
-        //  Note that NAKs are still generated by the transport.
-        rc = pgm_transport_set_recv_only (transport, true, false);
-        zmq_assert (rc == TRUE);
-
-        if (options.rcvbuf) {
-            rc = pgm_transport_set_rcvbuf (transport, (int) options.rcvbuf);
-            if (rc != TRUE)
-                return -1;
-        }
-
-        //  Set NAK transmit back-off interval [us].
-        rc = pgm_transport_set_nak_bo_ivl (transport, 50 * 1000);
-        zmq_assert (rc == TRUE);
-
-        //  Set timeout before repeating NAK [us].
-        rc = pgm_transport_set_nak_rpt_ivl (transport, 200 * 1000);
-        zmq_assert (rc == TRUE);
-
-        //  Set timeout for receiving RDATA.
-        rc = pgm_transport_set_nak_rdata_ivl (transport, 200 * 1000);
-        zmq_assert (rc == TRUE);
-
-        //  Set retries for NAK without NCF/DATA (NAK_DATA_RETRIES).
-        rc = pgm_transport_set_nak_data_retries (transport, 5);
-        zmq_assert (rc == TRUE);
-
-        //  Set retries for NCF after NAK (NAK_NCF_RETRIES).
-        rc = pgm_transport_set_nak_ncf_retries (transport, 2);
-        zmq_assert (rc == TRUE);
-
-        //  Set timeout for removing a dead peer [us].
-        rc = pgm_transport_set_peer_expiry (transport, 5 * 8192 * 1000);
-        zmq_assert (rc == TRUE);
-
-        //  Set expiration time of SPM Requests [us].
-        rc = pgm_transport_set_spmr_expiry (transport, 25 * 1000);
-        zmq_assert (rc == TRUE);
+    //  PGM transport GSI.
+    struct pgm_sockaddr_t addr;
 
-        //  Set the size of the receive window.
-        //  Data rate is in [B/s]. options.rate is in [kb/s].
-        if (options.rate <= 0) {
-            errno = EINVAL;
-            return -1;
-        }
-        rc = pgm_transport_set_rxw_max_rte (transport, 
-            options.rate * 1000 / 8);
-        if (rc != TRUE) {
-            errno = EINVAL;
-            return -1;
-        }
+    memset (&addr, 0, sizeof(addr));
+    addr.sa_port = port_number;
+    addr.sa_addr.sport = DEFAULT_DATA_SOURCE_PORT;
 
-        //  Recovery interval [s]. 
-        if (options.recovery_ivl <= 0) {
-            errno = EINVAL;
-            return -1;
-        }
-        rc = pgm_transport_set_rxw_secs (transport, options.recovery_ivl);
-        if (rc != TRUE) {
-            errno = EINVAL;
-            return -1;
-        }
+    if (options.identity.size () > 0) {
 
+        //  Create gsi from identity.
+        if (!pgm_gsi_create_from_data (&addr.sa_addr.gsi,
+              options.identity.data (), options.identity.size ()))
+            goto err_abort;
     } else {
 
-        //  Sender transport.
+        //  Generate random gsi.
+        std::string gsi_base = uuid_t ().to_string ();
+        if (!pgm_gsi_create_from_string (&addr.sa_addr.gsi,
+              gsi_base.c_str (), -1))
+            goto err_abort;
+    }
 
-        //  Waiting pipe won't be read.
-        rc = pgm_transport_set_send_only (transport, TRUE);
-        zmq_assert (rc == TRUE);
+    //  Bind a transport to the specified network devices.
+    struct pgm_interface_req_t if_req;
+    memset (&if_req, 0, sizeof(if_req));
+    if_req.ir_interface = res->ai_recv_addrs[0].gsr_interface;
+    if_req.ir_scope_id  = 0;
+    if (AF_INET6 == sa_family) {
+        struct sockaddr_in6 sa6;
+        memcpy (&sa6, &res->ai_recv_addrs[0].gsr_group, sizeof (sa6));
+        if_req.ir_scope_id = sa6.sin6_scope_id;
+    }
+    if (!pgm_bind3 (sock, &addr, sizeof (addr), &if_req, sizeof (if_req),
+          &if_req, sizeof (if_req), &pgm_error)) {
 
-        if (options.sndbuf) {
-            rc = pgm_transport_set_sndbuf (transport, (int) options.sndbuf);
-            if (rc != TRUE)
-                return -1;
-        }
+        //  Invalid parameters don't set pgm_error_t.
+        zmq_assert (pgm_error != NULL);
+        if ((pgm_error->domain == PGM_ERROR_DOMAIN_SOCKET ||
+             pgm_error->domain == PGM_ERROR_DOMAIN_IF) && (
+             pgm_error->code != PGM_ERROR_INVAL &&
+             pgm_error->code != PGM_ERROR_BADF &&
+             pgm_error->code != PGM_ERROR_FAULT))
 
-        //  Set the size of the send window.
-        //  Data rate is in [B/s] options.rate is in [kb/s].
-        if (options.rate <= 0) {
-            errno = EINVAL;
-            return -1;
-        }
-        rc = pgm_transport_set_txw_max_rte (transport, 
-            options.rate * 1000 / 8);
-        if (rc != TRUE) {
-            errno = EINVAL;
-            return -1;
-        }
+            //  User, host, or network configuration or transient error.
+            goto err_abort;
 
-        //  Recovery interval [s]. 
-        if (options.recovery_ivl <= 0) {
-            errno = EINVAL;
-            return -1;
-        }
-        rc = pgm_transport_set_txw_secs (transport, options.recovery_ivl);
-        if (rc != TRUE) {
-            errno = EINVAL;
-            return -1;
-        }
+        //  Fatal OpenPGM internal error.
+        zmq_assert (false);
+    }
 
-        //  Set interval of background SPM packets [us].
-        rc = pgm_transport_set_ambient_spm (transport, 8192 * 1000);
-        zmq_assert (rc == TRUE);
-
-        //  Set intervals of data flushing SPM packets [us].
-        guint spm_heartbeat[] = {4 * 1000, 4 * 1000, 8 * 1000, 16 * 1000, 
-            32 * 1000, 64 * 1000, 128 * 1000, 256 * 1000, 512 * 1000, 
-            1024 * 1000, 2048 * 1000, 4096 * 1000, 8192 * 1000};
-        rc = pgm_transport_set_heartbeat_spm (transport, spm_heartbeat, 
-            G_N_ELEMENTS(spm_heartbeat));
-        zmq_assert (rc == TRUE);
+    //  Join IP multicast groups.
+    for (unsigned i = 0; i < res->ai_recv_addrs_len; i++) {
+        if (!pgm_setsockopt (sock, IPPROTO_PGM, PGM_JOIN_GROUP,
+              &res->ai_recv_addrs [i], sizeof (struct group_req)))
+            goto err_abort;
     }
-    
-    //  Enable multicast loopback.
-    if (options.use_multicast_loop) {
-        rc = pgm_transport_set_multicast_loop (transport, true);
-        zmq_assert (rc == TRUE);
+    if (!pgm_setsockopt (sock, IPPROTO_PGM, PGM_SEND_GROUP,
+          &res->ai_send_addrs [0], sizeof (struct group_req)))
+        goto err_abort;
+
+    pgm_freeaddrinfo (res);
+    res = NULL;
+
+    //  Set IP level parameters.
+    {
+        const int nonblocking      = 1,
+                  multicast_loop   = options.use_multicast_loop ? 1 : 0,
+                  multicast_hops   = 16,
+
+                  //  Expedited Forwarding PHB for network elements, no ECN.
+                  dscp             = 0x2e << 2; 
+
+        if (!pgm_setsockopt (sock, IPPROTO_PGM, PGM_MULTICAST_LOOP,
+                &multicast_loop, sizeof (multicast_loop)) ||
+            !pgm_setsockopt (sock, IPPROTO_PGM, PGM_MULTICAST_HOPS,
+                &multicast_hops, sizeof (multicast_hops)))
+            goto err_abort;
+        if (AF_INET6 != sa_family && !pgm_setsockopt (sock,
+              IPPROTO_PGM, PGM_TOS, &dscp, sizeof (dscp)))
+            goto err_abort;
+        if (!pgm_setsockopt (sock, IPPROTO_PGM, PGM_NOBLOCK,
+              &nonblocking, sizeof (nonblocking)))
+            goto err_abort;
     }
 
-    //  Bind a transport to the specified network devices.
-    if (!pgm_transport_bind (transport, &pgm_error)) {
-        if (pgm_error->domain == PGM_IF_ERROR && (
-              pgm_error->code == PGM_IF_ERROR_INVAL ||
-              pgm_error->code == PGM_IF_ERROR_XDEV ||
-              pgm_error->code == PGM_IF_ERROR_NODEV ||
-              pgm_error->code == PGM_IF_ERROR_NOTUNIQ ||
-              pgm_error->code == PGM_IF_ERROR_ADDRFAMILY ||
-              pgm_error->code == PGM_IF_ERROR_FAMILY ||
-              pgm_error->code == PGM_IF_ERROR_NODATA ||
-              pgm_error->code == PGM_IF_ERROR_NONAME ||
-              pgm_error->code == PGM_IF_ERROR_SERVICE)) {
-            g_error_free (pgm_error);
-            errno = EINVAL;
-            return -1;
-        }
-        if (pgm_error->domain == PGM_TRANSPORT_ERROR && (
-              pgm_error->code == PGM_TRANSPORT_ERROR_FAILED)) {
-            g_error_free (pgm_error);
-            errno = EINVAL;
-            return -1;
-        }
+    //  Connect PGM transport to start state machine.
+    if (!pgm_connect (sock, &pgm_error)) {
 
-        zmq_assert (false);
+        //  Invalid parameters don't set pgm_error_t.
+        zmq_assert (pgm_error != NULL);
+        goto err_abort;
     }
 
     //  For receiver transport preallocate pgm_msgv array.
-    //  TODO: ?
     if (receiver) {
         zmq_assert (in_batch_size > 0);
         size_t max_tsdu_size = get_max_tsdu_size ();
@@ -337,96 +362,176 @@ int zmq::pgm_socket_t::init (bool udp_encapsulation_, const char *network_)
         zmq_assert (pgm_msgv_len);
 
         pgm_msgv = (pgm_msgv_t*) malloc (sizeof (pgm_msgv_t) * pgm_msgv_len);
+        alloc_assert (pgm_msgv);
     }
 
     return 0;
+
+err_abort:
+    if (sock != NULL) {
+        pgm_close (sock, FALSE);
+        sock = NULL;
+    }
+    if (res != NULL) {
+        pgm_freeaddrinfo (res);
+        res = NULL;
+    }
+    if (pgm_error != NULL) {
+        pgm_error_free (pgm_error);
+        pgm_error = NULL;
+    }
+    errno = EINVAL;
+    return -1;
 }
 
 zmq::pgm_socket_t::~pgm_socket_t ()
 {
     if (pgm_msgv)
         free (pgm_msgv);
-    if (transport) 
-        pgm_transport_destroy (transport, TRUE);
+    if (sock) 
+        pgm_close (sock, TRUE);
 }
 
-//   Get receiver fds. recv_fd is from transport->recv_sock
-//   waiting_pipe_fd is from transport->waiting_pipe [0]
+//  Get receiver fds. receive_fd_ is signaled for incoming packets,
+//  waiting_pipe_fd_ is signaled for state driven events and data.
 void zmq::pgm_socket_t::get_receiver_fds (int *receive_fd_, 
     int *waiting_pipe_fd_)
 {
+    socklen_t socklen;
+    bool rc;
+
     zmq_assert (receive_fd_);
     zmq_assert (waiting_pipe_fd_);
 
-    //  recv_sock2 should not be used - check it.
-    zmq_assert (transport->recv_sock2 == -1);
-
-    //  Check if transport can receive data and can not send.
-    zmq_assert (transport->can_recv_data);
-    zmq_assert (!transport->can_send_data);
-
-    //  Take FDs directly from transport.
-    *receive_fd_ = pgm_transport_get_recv_fd (transport);
-    *waiting_pipe_fd_ = pgm_transport_get_pending_fd (transport);
+    socklen = sizeof (*receive_fd_);
+    rc = pgm_getsockopt (sock, IPPROTO_PGM, PGM_RECV_SOCK, receive_fd_,
+        &socklen);
+    zmq_assert (rc);
+    zmq_assert (socklen == sizeof (*receive_fd_));
+
+    socklen = sizeof (*waiting_pipe_fd_);
+    rc = pgm_getsockopt (sock, IPPROTO_PGM, PGM_PENDING_SOCK, waiting_pipe_fd_,
+        &socklen);
+    zmq_assert (rc);
+    zmq_assert (socklen == sizeof (*waiting_pipe_fd_));
 }
 
 //  Get fds and store them into user allocated memory. 
-//  sender_fd is from pgm_transport->send_sock.
-//  receive_fd_ is from  transport->recv_sock.
-//  rdata_notify_fd_ is from transport->rdata_notify.
-//  pending_notify_fd_ is from transport->pending_notify.
+//  send_fd is for non-blocking send wire notifications.
+//  receive_fd_ is for incoming back-channel protocol packets.
+//  rdata_notify_fd_ is raised for waiting repair transmissions.
+//  pending_notify_fd_ is for state driven events.
 void zmq::pgm_socket_t::get_sender_fds (int *send_fd_, int *receive_fd_, 
     int *rdata_notify_fd_, int *pending_notify_fd_)
 {
+    socklen_t socklen;
+    bool rc;
+
     zmq_assert (send_fd_);
     zmq_assert (receive_fd_);
-
     zmq_assert (rdata_notify_fd_);
     zmq_assert (pending_notify_fd_);
 
-    //  recv_sock2 should not be used - check it.
-    zmq_assert (transport->recv_sock2 == -1);
-
-    //  Check if transport can send data and can not receive.
-    zmq_assert (transport->can_send_data);
-    zmq_assert (!transport->can_recv_data);
-
-    //  Take FDs from transport.
-    *send_fd_ = pgm_transport_get_send_fd (transport);
-    *receive_fd_ = pgm_transport_get_recv_fd (transport);
-
-    *rdata_notify_fd_ = pgm_transport_get_repair_fd (transport);
-    *pending_notify_fd_ = pgm_transport_get_pending_fd (transport);
+    socklen = sizeof (*send_fd_);
+    rc = pgm_getsockopt (sock, IPPROTO_PGM, PGM_SEND_SOCK, send_fd_, &socklen);
+    zmq_assert (rc);
+    zmq_assert (socklen == sizeof (*receive_fd_));
+
+    socklen = sizeof (*receive_fd_);
+    rc = pgm_getsockopt (sock, IPPROTO_PGM, PGM_RECV_SOCK, receive_fd_,
+        &socklen);
+    zmq_assert (rc);
+    zmq_assert (socklen == sizeof (*receive_fd_));
+
+    socklen = sizeof (*rdata_notify_fd_);
+    rc = pgm_getsockopt (sock, IPPROTO_PGM, PGM_REPAIR_SOCK, rdata_notify_fd_,
+        &socklen);
+    zmq_assert (rc);
+    zmq_assert (socklen == sizeof (*rdata_notify_fd_));
+
+    socklen = sizeof (*pending_notify_fd_);
+    rc = pgm_getsockopt (sock, IPPROTO_PGM, PGM_PENDING_SOCK,
+        pending_notify_fd_, &socklen);
+    zmq_assert (rc);
+    zmq_assert (socklen == sizeof (*pending_notify_fd_));
 }
 
 //  Send one APDU, transmit window owned memory.
+//  data_len_ must be less than one TPDU.
 size_t zmq::pgm_socket_t::send (unsigned char *data_, size_t data_len_)
 {
     size_t nbytes = 0;
    
-    PGMIOStatus status = pgm_send (transport, data_, data_len_, &nbytes);
+    const int status = pgm_send (sock, data_, data_len_, &nbytes);
 
-    if (nbytes != data_len_) {
-        zmq_assert (status == PGM_IO_STATUS_RATE_LIMITED);
-        zmq_assert (nbytes == 0);
-    }
-    
-    // We have to write all data as one packet.
-    if (nbytes > 0)
+    //  We have to write all data as one packet.
+    if (nbytes > 0) {
+        zmq_assert (status == PGM_IO_STATUS_NORMAL);
         zmq_assert ((ssize_t) nbytes == (ssize_t) data_len_);
+    } else {
+        zmq_assert (status == PGM_IO_STATUS_RATE_LIMITED ||
+            status == PGM_IO_STATUS_WOULD_BLOCK);
+
+        if (status == PGM_IO_STATUS_RATE_LIMITED)
+            errno = ENOMEM;
+        else
+            errno = EBUSY;
+    }
+
+    //  Save return value.
+    last_tx_status = status;
 
     return nbytes;
 }
 
+long zmq::pgm_socket_t::get_rx_timeout ()
+{
+    if (last_rx_status != PGM_IO_STATUS_RATE_LIMITED &&
+          last_rx_status != PGM_IO_STATUS_TIMER_PENDING)
+        return -1;
+
+    struct timeval tv;
+    socklen_t optlen = sizeof (tv);
+    const bool rc = pgm_getsockopt (sock, IPPROTO_PGM,
+        last_rx_status == PGM_IO_STATUS_RATE_LIMITED ? PGM_RATE_REMAIN :
+        PGM_TIME_REMAIN, &tv, &optlen);
+    zmq_assert (rc);
+
+    const long timeout = (tv.tv_sec * 1000) + (tv.tv_usec / 1000);
+
+    return timeout;
+}
+
+long zmq::pgm_socket_t::get_tx_timeout ()
+{
+    if (last_tx_status != PGM_IO_STATUS_RATE_LIMITED)
+        return -1;
+
+    struct timeval tv;
+    socklen_t optlen = sizeof (tv);
+    const bool rc = pgm_getsockopt (sock, IPPROTO_PGM, PGM_RATE_REMAIN, &tv,
+        &optlen);
+    zmq_assert (rc);
+
+    const long timeout = (tv.tv_sec * 1000) + (tv.tv_usec / 1000);
+
+    return timeout;
+}
+
 //  Return max TSDU size without fragmentation from current PGM transport.
 size_t zmq::pgm_socket_t::get_max_tsdu_size ()
 {
-    return (size_t) pgm_transport_max_tsdu (transport, false);
+    int max_tsdu = 0;
+    socklen_t optlen = sizeof (max_tsdu);
+
+    bool rc = pgm_getsockopt (sock, IPPROTO_PGM, PGM_MSS, &max_tsdu, &optlen);
+    zmq_assert (rc);
+    zmq_assert (optlen == sizeof (max_tsdu));
+    return (size_t) max_tsdu;
 }
 
-//  pgm_transport_recvmsgv is called to fill the pgm_msgv array up to 
-//  pgm_msgv_len. In subsequent calls data from pgm_msgv structure are 
-//  returned.
+//  pgm_recvmsgv is called to fill the pgm_msgv array up to  pgm_msgv_len.
+//  In subsequent calls data from pgm_msgv structure are returned.
 ssize_t zmq::pgm_socket_t::receive (void **raw_data_, const pgm_tsi_t **tsi_)
 {
     size_t raw_data_len = 0;
@@ -439,6 +544,7 @@ ssize_t zmq::pgm_socket_t::receive (void **raw_data_, const pgm_tsi_t **tsi_)
         nbytes_rec = 0;
         nbytes_processed = 0;
         pgm_msgv_processed = 0;
+        errno = EAGAIN;
         return 0;
     }
 
@@ -453,15 +559,18 @@ ssize_t zmq::pgm_socket_t::receive (void **raw_data_, const pgm_tsi_t **tsi_)
 
         //  Receive a vector of Application Protocol Domain Unit's (APDUs) 
         //  from the transport.
-        GError *pgm_error = NULL;
+        pgm_error_t *pgm_error = NULL;
 
-        const PGMIOStatus status = pgm_recvmsgv (transport, pgm_msgv,
-            pgm_msgv_len, MSG_DONTWAIT, &nbytes_rec, &pgm_error);
+        const int status = pgm_recvmsgv (sock, pgm_msgv,
+            pgm_msgv_len, MSG_ERRQUEUE, &nbytes_rec, &pgm_error);
 
+        //  Invalid parameters.
         zmq_assert (status != PGM_IO_STATUS_ERROR);
 
+        last_rx_status = status;
+
         //  In a case when no ODATA/RDATA fired POLLIN event (SPM...)
-        //  pgm_recvmsg returns ?.
+        //  pgm_recvmsg returns PGM_IO_STATUS_TIMER_PENDING.
         if (status == PGM_IO_STATUS_TIMER_PENDING) {
 
             zmq_assert (nbytes_rec == 0);
@@ -469,21 +578,44 @@ ssize_t zmq::pgm_socket_t::receive (void **raw_data_, const pgm_tsi_t **tsi_)
             //  In case if no RDATA/ODATA caused POLLIN 0 is 
             //  returned.
             nbytes_rec = 0;
+            errno = EBUSY;
+            return 0;
+        }
+
+        //  Send SPMR, NAK, ACK is rate limited.
+        if (status == PGM_IO_STATUS_RATE_LIMITED) {
+
+            zmq_assert (nbytes_rec == 0);
+
+            //  In case if no RDATA/ODATA caused POLLIN 0 is returned.
+            nbytes_rec = 0;
+            errno = ENOMEM;
+            return 0;
+        }
+
+        //  No peers and hence no incoming packets.
+        if (status == PGM_IO_STATUS_WOULD_BLOCK) {
+
+            zmq_assert (nbytes_rec == 0);
+
+            //  In case if no RDATA/ODATA caused POLLIN 0 is returned.
+            nbytes_rec = 0;
+            errno = EAGAIN;
             return 0;
         }
 
         //  Data loss.
         if (status == PGM_IO_STATUS_RESET) {
 
-            pgm_peer_t* peer = (pgm_peer_t*) transport->peers_pending->data;
+            struct pgm_sk_buff_t* skb = pgm_msgv [0].msgv_skb [0];
 
             //  Save lost data TSI.
-            *tsi_ = &peer->tsi;
+            *tsi_ = &skb->tsi;
             nbytes_rec = 0;
 
             //  In case of dala loss -1 is returned.
             errno = EINVAL;
-            g_error_free (pgm_error);
+            pgm_free_skb (skb);
             return -1;
         }
 
@@ -494,6 +626,7 @@ ssize_t zmq::pgm_socket_t::receive (void **raw_data_, const pgm_tsi_t **tsi_)
         zmq_assert (pgm_msgv_processed <= pgm_msgv_len);
     }
 
+    // Zero byte payloads are valid in PGM, but not 0MQ protocol.
     zmq_assert (nbytes_rec > 0);
 
     // Only one APDU per pgm_msgv_t structure is allowed.
@@ -522,16 +655,50 @@ void zmq::pgm_socket_t::process_upstream ()
     pgm_msgv_t dummy_msg;
 
     size_t dummy_bytes = 0;
-    GError *pgm_error = NULL;
+    pgm_error_t *pgm_error = NULL;
 
-    PGMIOStatus status = pgm_recvmsgv (transport, &dummy_msg,
-        1, MSG_DONTWAIT, &dummy_bytes, &pgm_error);
+    const int status = pgm_recvmsgv (sock, &dummy_msg,
+        1, MSG_ERRQUEUE, &dummy_bytes, &pgm_error);
 
+    //  Invalid parameters.
     zmq_assert (status != PGM_IO_STATUS_ERROR);
 
     //  No data should be returned.
     zmq_assert (dummy_bytes == 0 && (status == PGM_IO_STATUS_TIMER_PENDING || 
-        status == PGM_IO_STATUS_RATE_LIMITED));
+        status == PGM_IO_STATUS_RATE_LIMITED ||
+        status == PGM_IO_STATUS_WOULD_BLOCK));
+
+    last_rx_status = status;
+
+    if (status == PGM_IO_STATUS_TIMER_PENDING)
+        errno = EBUSY;
+    else if (status == PGM_IO_STATUS_RATE_LIMITED)
+        errno = ENOMEM;
+    else
+        errno = EAGAIN;
+}
+
+int zmq::pgm_socket_t::compute_sqns (int tpdu_)
+{
+    //  Convert rate into B/ms.
+    uint64_t rate = ((uint64_t) options.rate) / 8;
+
+    //  Get recovery interval in milliseconds.
+    uint64_t interval = options.recovery_ivl_msec >= 0 ?
+        options.recovery_ivl_msec :
+        options.recovery_ivl * 1000;
+        
+    //  Compute the size of the buffer in bytes.
+    uint64_t size = interval * rate;
+
+    //  Translate the size into number of packets.
+    uint64_t sqns = size / tpdu_;
+
+    //  Buffer should be able to contain at least one packet.
+    if (sqns == 0)
+        sqns = 1;
+
+    return (int) sqns;
 }
 
 #endif
diff --git a/src/pgm_socket.hpp b/src/pgm_socket.hpp
index b9f55d1..9699aed 100644
--- a/src/pgm_socket.hpp
+++ b/src/pgm_socket.hpp
@@ -1,19 +1,20 @@
 /*
-    Copyright (c) 2007-2010 iMatix Corporation
+    Copyright (c) 2007-2011 iMatix Corporation
+    Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
 
     This file is part of 0MQ.
 
     0MQ is free software; you can redistribute it and/or modify it under
-    the terms of the Lesser GNU General Public License as published by
+    the terms of the GNU Lesser General Public License as published by
     the Free Software Foundation; either version 3 of the License, or
     (at your option) any later version.
 
     0MQ is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    Lesser GNU General Public License for more details.
+    GNU Lesser General Public License for more details.
 
-    You should have received a copy of the Lesser GNU General Public License
+    You should have received a copy of the GNU Lesser General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
@@ -28,8 +29,13 @@
 #include "windows.hpp"
 #endif
 
+#define __PGM_WININT_H__
 #include <pgm/pgm.h>
 
+#ifdef ZMQ_HAVE_OSX
+#include <pgm/in.h>
+#endif
+
 #include "options.hpp"
 
 namespace zmq
@@ -39,9 +45,8 @@ namespace zmq
     {
 
     public:
+
         //  If receiver_ is true PGM transport is not generating SPM packets.
-        //  interface format: iface;mcast_group:port for raw PGM socket
-        //                    udp:iface;mcast_goup:port for UDP encapsulacion
         pgm_socket_t (bool receiver_, const options_t &options_);
 
         //  Closes the transport.
@@ -67,14 +72,22 @@ namespace zmq
         //  Receive data from pgm socket.
         ssize_t receive (void **data_, const pgm_tsi_t **tsi_);
 
+        long get_rx_timeout ();
+        long get_tx_timeout ();
+
         //  POLLIN on sender side should mean NAK or SPMR receiving. 
         //  process_upstream function is used to handle such a situation.
         void process_upstream ();
 
     private:
+
+        //  Compute size of the buffer based on rate and recovery interval.
+        int compute_sqns (int tpdu_);
     
-        //  OpenPGM transport
-        pgm_transport_t* transport;
+        //  OpenPGM transport.
+        pgm_sock_t* sock;
+
+        int last_rx_status, last_tx_status;
 
         //  Associated socket options.
         options_t options;
diff --git a/src/pipe.cpp b/src/pipe.cpp
index 200beb0..8dcf577 100644
--- a/src/pipe.cpp
+++ b/src/pipe.cpp
@@ -1,47 +1,72 @@
 /*
-    Copyright (c) 2007-2010 iMatix Corporation
+    Copyright (c) 2007-2011 iMatix Corporation
+    Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
 
     This file is part of 0MQ.
 
     0MQ is free software; you can redistribute it and/or modify it under
-    the terms of the Lesser GNU General Public License as published by
+    the terms of the GNU Lesser General Public License as published by
     the Free Software Foundation; either version 3 of the License, or
     (at your option) any later version.
 
     0MQ is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    Lesser GNU General Public License for more details.
+    GNU Lesser General Public License for more details.
 
-    You should have received a copy of the Lesser GNU General Public License
+    You should have received a copy of the GNU Lesser General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
+#include <new>
+
 #include "../include/zmq.h"
 
 #include "pipe.hpp"
+#include "likely.hpp"
 
-zmq::reader_t::reader_t (object_t *parent_, uint64_t lwm_) :
+zmq::reader_t::reader_t (object_t *parent_, pipe_t *pipe_,
+      uint64_t lwm_) :
     object_t (parent_),
-    pipe (NULL),
-    peer (NULL),
+    active (true),
+    pipe (pipe_),
+    writer (NULL),
     lwm (lwm_),
     msgs_read (0),
-    endpoint (NULL)
-{}
+    sink (NULL),
+    terminating (false)
+{
+    //  Note that writer is not set here. Writer will inform reader about its
+    //  address once it is created (via set_writer method).
+}
+
+void zmq::reader_t::set_writer (writer_t *writer_)
+{
+    zmq_assert (!writer);
+    writer = writer_;
+}
 
 zmq::reader_t::~reader_t ()
 {
-    if (pipe)
-        unregister_pipe (pipe);
+    //  Pipe as such is owned and deallocated by reader object.
+    //  The point is that reader processes the last step of terminal
+    //  handshaking (term_ack).
+    zmq_assert (pipe);
+
+    //  First delete all the unread messages in the pipe. We have to do it by
+    //  hand because zmq_msg_t is a POD, not a class, so there's no associated
+    //  destructor.
+    zmq_msg_t msg;
+    while (pipe->read (&msg))
+       zmq_msg_close (&msg);
+
+    delete pipe;
 }
 
-void zmq::reader_t::set_pipe (pipe_t *pipe_)
+void zmq::reader_t::set_event_sink (i_reader_events *sink_)
 {
-    zmq_assert (!pipe);
-    pipe = pipe_;
-    peer = &pipe->writer;
-    register_pipe (pipe);
+    zmq_assert (!sink);
+    sink = sink_;
 }
 
 bool zmq::reader_t::is_delimiter (zmq_msg_t &msg_)
@@ -53,19 +78,24 @@ bool zmq::reader_t::is_delimiter (zmq_msg_t &msg_)
 
 bool zmq::reader_t::check_read ()
 {
+    if (!active)
+        return false;
+
     //  Check if there's an item in the pipe.
-    //  If not, deactivate the pipe.
     if (!pipe->check_read ()) {
-        endpoint->kill (this);
+        active = false;
         return false;
     }
 
     //  If the next item in the pipe is message delimiter,
     //  initiate its termination.
     if (pipe->probe (is_delimiter)) {
-        if (endpoint)
-            endpoint->detach_inpipe (this);
-        term ();
+        zmq_msg_t msg;
+        bool ok = pipe->read (&msg);
+        zmq_assert (ok);
+        if (sink)
+            sink->delimited (this);
+        terminate ();
         return false;
     }
 
@@ -74,17 +104,20 @@ bool zmq::reader_t::check_read ()
 
 bool zmq::reader_t::read (zmq_msg_t *msg_)
 {
+    if (!active)
+        return false;
+
     if (!pipe->read (msg_)) {
-        endpoint->kill (this);
+        active = false;
         return false;
     }
 
     //  If delimiter was read, start termination process of the pipe.
     unsigned char *offset = 0;
     if (msg_->content == (void*) (offset + ZMQ_DELIMITER)) {
-        if (endpoint)
-            endpoint->detach_inpipe (this);
-        term ();
+        if (sink)
+            sink->delimited (this);
+        terminate ();
         return false;
     }
 
@@ -92,87 +125,104 @@ bool zmq::reader_t::read (zmq_msg_t *msg_)
         msgs_read++;
 
     if (lwm > 0 && msgs_read % lwm == 0)
-        send_reader_info (peer, msgs_read);
+        send_activate_writer (writer, msgs_read);
 
     return true;
 }
 
-void zmq::reader_t::set_endpoint (i_endpoint *endpoint_)
+void zmq::reader_t::terminate ()
 {
-    endpoint = endpoint_;
-}
+    //  If termination was already started by the peer, do nothing.
+    if (terminating)
+        return;
 
-void zmq::reader_t::term ()
-{
-    endpoint = NULL;
-    send_pipe_term (peer);
+    active = false;
+    terminating = true;
+    send_pipe_term (writer);
 }
 
-void zmq::reader_t::process_revive ()
+void zmq::reader_t::process_activate_reader ()
 {
-    //  Beacuse of command throttling mechanism, incoming termination request
-    //  may not have been processed before subsequent send.
-    //  In that case endpoint is NULL.
-    if (endpoint)
-        endpoint->revive (this);
+    //  Forward the event to the sink (either socket or session).
+    active = true;
+    sink->activated (this);
 }
 
 void zmq::reader_t::process_pipe_term_ack ()
 {
-    peer = NULL;
-    delete pipe;
+    //  At this point writer may already be deallocated.
+    //  For safety's sake drop the reference to it.
+    writer = NULL;
+
+    //  Notify owner about the termination.
+    zmq_assert (sink);
+    sink->terminated (this);
+
+    //  Deallocate resources.
+    delete this;
 }
 
-zmq::writer_t::writer_t (object_t *parent_,
+zmq::writer_t::writer_t (object_t *parent_, pipe_t *pipe_, reader_t *reader_,
       uint64_t hwm_, int64_t swap_size_) :
     object_t (parent_),
-    pipe (NULL),
-    peer (NULL),
+    active (true),
+    pipe (pipe_),
+    reader (reader_),
     hwm (hwm_),
     msgs_read (0),
     msgs_written (0),
-    msg_store (NULL),
-    extra_msg_flag (false),
-    stalled (false),
-    pending_close (false),
-    endpoint (NULL)
+    swap (NULL),
+    sink (NULL),
+    swapping (false),
+    pending_delimiter (false),
+    terminating (false)
 {
+    //  Inform reader about the writer.
+    reader->set_writer (this);
+
+    //  Open the swap file, if required.
     if (swap_size_ > 0) {
-        msg_store = new (std::nothrow) msg_store_t (swap_size_);
-        if (msg_store != NULL) {
-            if (msg_store->init () < 0) {
-                delete msg_store;
-                msg_store = NULL;
-            }
-        }
+        swap = new (std::nothrow) swap_t (swap_size_);
+        alloc_assert (swap);
+        int rc = swap->init ();
+        zmq_assert (rc == 0);
     }
 }
 
-void zmq::writer_t::set_endpoint (i_endpoint *endpoint_)
-{
-    endpoint = endpoint_;
-}
-
 zmq::writer_t::~writer_t ()
 {
-    if (extra_msg_flag)
-        zmq_msg_close (&extra_msg);
-
-    delete msg_store;
+    if (swap)
+       delete swap;
 }
 
-void zmq::writer_t::set_pipe (pipe_t *pipe_)
+void zmq::writer_t::set_event_sink (i_writer_events *sink_)
 {
-    zmq_assert (!pipe);
-    pipe = pipe_;
-    peer = &pipe->reader;
+    zmq_assert (!sink);
+    sink = sink_;
 }
 
-bool zmq::writer_t::check_write ()
+bool zmq::writer_t::check_write (zmq_msg_t *msg_)
 {
-    if (pipe_full () && (msg_store == NULL || msg_store->full () || extra_msg_flag)) {
-        stalled = true;
+    //  We've already checked and there's no space free for the new message.
+    //  There's no point in checking once again.
+    if (unlikely (!active))
         return false;
+
+    if (unlikely (swapping)) {
+        if (unlikely (!swap->fits (msg_))) {
+            active = false;
+            return false;
+        }
+    }
+    else {
+        if (unlikely (pipe_full ())) {
+            if (swap)
+                swapping = true;
+            else {
+                active = false;
+                return false;
+            }
+        }
     }
 
     return true;
@@ -180,73 +230,68 @@ bool zmq::writer_t::check_write ()
 
 bool zmq::writer_t::write (zmq_msg_t *msg_)
 {
-    if (!check_write ())
+    if (unlikely (!check_write (msg_)))
         return false;
 
-    if (pipe_full ()) {
-        if (msg_store->store (msg_)) {
-            if (!(msg_->flags & ZMQ_MSG_MORE))
-                msg_store->commit ();
-        } else {
-            extra_msg = *msg_;
-            extra_msg_flag = true;
-        }
-    }
-    else {
-        pipe->write (*msg_, msg_->flags & ZMQ_MSG_MORE);
+    if (unlikely (swapping)) {
+        bool stored = swap->store (msg_);
+        zmq_assert (stored);
         if (!(msg_->flags & ZMQ_MSG_MORE))
-            msgs_written++;
+            swap->commit ();
+        return true;
     }
 
+    pipe->write (*msg_, msg_->flags & ZMQ_MSG_MORE);
+    if (!(msg_->flags & ZMQ_MSG_MORE))
+        msgs_written++;
+
     return true;
 }
 
 void zmq::writer_t::rollback ()
 {
-    if (extra_msg_flag && extra_msg.flags & ZMQ_MSG_MORE) {
-        zmq_msg_close (&extra_msg);
-        extra_msg_flag = false;
+    //  Remove incomplete message from the swap.
+    if (unlikely (swapping)) {
+        swap->rollback ();
+        return;
     }
 
-    if (msg_store != NULL)
-        msg_store->rollback ();
-
+    //  Remove incomplete message from the pipe.
     zmq_msg_t msg;
-    //  Remove all incomplete messages from the pipe.
     while (pipe->unwrite (&msg)) {
         zmq_assert (msg.flags & ZMQ_MSG_MORE);
         zmq_msg_close (&msg);
     }
-
-    if (stalled && endpoint != NULL && check_write ()) {
-        stalled = false;
-        endpoint->revive (this);
-    }
 }
 
 void zmq::writer_t::flush ()
 {
-    if (!pipe->flush ())
-        send_revive (peer);
+    //  In the swapping mode, flushing is automatically handled by swap object.
+    if (!swapping && !pipe->flush ())
+        send_activate_reader (reader);
 }
 
-void zmq::writer_t::term ()
+void zmq::writer_t::terminate ()
 {
-    endpoint = NULL;
+    //  Prevent double termination.
+    if (terminating)
+        return;
+    terminating = true;
+
+    //  Mark the pipe as not available for writing.
+    active = false;
 
     //  Rollback any unfinished messages.
     rollback ();
 
-    if (msg_store == NULL || (msg_store->empty () && !extra_msg_flag))
-        write_delimiter ();
-    else
-        pending_close = true;
-}
+    if (swapping) {
+        pending_delimiter = true;
+        return;
+    }
 
-void zmq::writer_t::write_delimiter ()
-{
-    //  Push delimiter into the pipe.
-    //  Trick the compiler to belive that the tag is a valid pointer.
+    //  Push delimiter into the pipe. Trick the compiler to belive that
+    //  the tag is a valid pointer. Note that watermarks are not checked
+    //  thus the delimiter can be written even though the pipe is full.
     zmq_msg_t msg;
     const unsigned char *offset = 0;
     msg.content = (void*) (offset + ZMQ_DELIMITER);
@@ -255,109 +300,110 @@ void zmq::writer_t::write_delimiter ()
     flush ();
 }
 
-void zmq::writer_t::process_reader_info (uint64_t msgs_read_)
+void zmq::writer_t::process_activate_writer (uint64_t msgs_read_)
 {
-    zmq_msg_t msg;
-
+    //  Store the reader's message sequence number.
     msgs_read = msgs_read_;
-    if (msg_store) {
 
-        //  Move messages from backing store into pipe.
-        while (!pipe_full () && !msg_store->empty ()) {
-            msg_store->fetch(&msg);
-            //  Write message into the pipe.
+    //  If we are in the swapping mode, we have some messages in the swap.
+    //  Given that pipe is now ready for writing we can move part of the
+    //  swap into the pipe.
+    if (swapping) {
+        zmq_msg_t msg;
+        while (!pipe_full () && !swap->empty ()) {
+            swap->fetch(&msg);
             pipe->write (msg, msg.flags & ZMQ_MSG_MORE);
             if (!(msg.flags & ZMQ_MSG_MORE))
                 msgs_written++;
         }
-
-        if (extra_msg_flag) {
-            if (!pipe_full ()) {
-                pipe->write (extra_msg, extra_msg.flags & ZMQ_MSG_MORE);
-                if (!(extra_msg.flags & ZMQ_MSG_MORE))
-                    msgs_written++;
-                extra_msg_flag = false;
-            }
-            else if (msg_store->store (&extra_msg)) {
-                if (!(extra_msg.flags & ZMQ_MSG_MORE))
-                    msg_store->commit ();
-                extra_msg_flag = false;
+        if (!pipe->flush ())
+            send_activate_reader (reader);
+
+        //  There are no more messages in the swap. We can switch into
+        //  standard in-memory mode.
+        if (swap->empty ()) {        
+            swapping = false;
+
+            //  Push delimiter into the pipe. Trick the compiler to belive that
+            //  the tag is a valid pointer. Note that watermarks are not checked
+            //  thus the delimiter can be written even though the pipe is full.
+            if (pending_delimiter) {
+                zmq_msg_t msg;
+                const unsigned char *offset = 0;
+                msg.content = (void*) (offset + ZMQ_DELIMITER);
+                msg.flags = 0;
+                pipe->write (msg, false);
+                flush ();
+                return;
             }
         }
-
-        if (pending_close && msg_store->empty () && !extra_msg_flag) {
-            write_delimiter ();
-            pending_close = false;
-        }
-
-        flush ();
     }
 
-    if (stalled && endpoint != NULL) {
-        stalled = false;
-        endpoint->revive (this);
+    //  If the writer was non-active before, let's make it active
+    //  (available for writing messages to).
+    if (!active && !terminating) {
+        active = true;
+        zmq_assert (sink);
+        sink->activated (this);
     }
 }
 
 void zmq::writer_t::process_pipe_term ()
 {
-    if (endpoint)
-        endpoint->detach_outpipe (this);
+    send_pipe_term_ack (reader);
 
-    reader_t *p = peer;
-    peer = NULL;
-    send_pipe_term_ack (p);
-}
+    //  The above command allows reader to deallocate itself and the pipe.
+    //  For safety's sake we'll drop the pointers here.
+    reader = NULL;
+    pipe = NULL;
 
-bool zmq::writer_t::pipe_full ()
-{
-    return hwm > 0 && msgs_written - msgs_read == hwm;
-}
+    //  Notify owner about the termination.
+    zmq_assert (sink);
+    sink->terminated (this);
 
-zmq::pipe_t::pipe_t (object_t *reader_parent_, object_t *writer_parent_,
-      uint64_t hwm_, int64_t swap_size_) :
-    reader (reader_parent_, compute_lwm (hwm_)),
-    writer (writer_parent_, hwm_, swap_size_)
-{
-    reader.set_pipe (this);
-    writer.set_pipe (this);
+    //  Deallocate the resources.
+    delete this;
 }
 
-zmq::pipe_t::~pipe_t ()
+bool zmq::writer_t::pipe_full ()
 {
-    //  Deallocate all the unread messages in the pipe. We have to do it by
-    //  hand because zmq_msg_t is a POD, not a class, so there's no associated
-    //  destructor.
-    zmq_msg_t msg;
-    while (read (&msg))
-       zmq_msg_close (&msg);
+    return hwm > 0 && msgs_written - msgs_read == hwm;
 }
 
-uint64_t zmq::pipe_t::compute_lwm (uint64_t hwm_)
+void zmq::create_pipe (object_t *reader_parent_, object_t *writer_parent_,
+    uint64_t hwm_, int64_t swap_size_, reader_t **reader_, writer_t **writer_)
 {
-   //  Following point should be taken into consideration when computing
-   //  low watermark:
-   //
-   //  1. LWM has to be less than HWM.
-   //  2. LWM cannot be set to very low value (such as zero) as after filling
-   //     the queue it would start to refill only after all the messages are
-   //     read from it and thus unnecessarily hold the progress back.
-   //  3. LWM cannot be set to very high value (such as HWM-1) as it would
-   //     result in lock-step filling of the queue - if a single message is read
-   //     from a full queue, writer thread is resumed to write exactly one
-   //     message to the queue and go back to sleep immediately. This would
-   //     result in low performance.
-   //
-   //  Given the 3. it would be good to keep HWM and LWM as far apart as
-   //  possible to reduce the thread switching overhead to almost zero,
-   //  say HWM-LWM should be 500 (max_wm_delta).
-   //
-   //  That done, we still we have to account for the cases where HWM<500 thus
-   //  driving LWM to negative numbers. Let's make LWM 1/2 of HWM in such cases.
-
-    if (hwm_ > max_wm_delta * 2)
-        return hwm_ - max_wm_delta;
-    else
-        return (hwm_ + 1) / 2;
+    //  First compute the low water mark. Following point should be taken
+    //  into consideration:
+    //
+    //  1. LWM has to be less than HWM.
+    //  2. LWM cannot be set to very low value (such as zero) as after filling
+    //     the queue it would start to refill only after all the messages are
+    //     read from it and thus unnecessarily hold the progress back.
+    //  3. LWM cannot be set to very high value (such as HWM-1) as it would
+    //     result in lock-step filling of the queue - if a single message is
+    //     read from a full queue, writer thread is resumed to write exactly one
+    //     message to the queue and go back to sleep immediately. This would
+    //     result in low performance.
+    //
+    //  Given the 3. it would be good to keep HWM and LWM as far apart as
+    //  possible to reduce the thread switching overhead to almost zero,
+    //  say HWM-LWM should be max_wm_delta.
+    //
+    //  That done, we still we have to account for the cases where
+    //  HWM < max_wm_delta thus driving LWM to negative numbers.
+    //  Let's make LWM 1/2 of HWM in such cases.
+    uint64_t lwm = (hwm_ > max_wm_delta * 2) ?
+        hwm_ - max_wm_delta : (hwm_ + 1) / 2;
+
+    //  Create all three objects pipe consists of: the pipe per se, reader and
+    //  writer. The pipe will be handled by reader and writer, its never passed
+    //  to the user. Reader and writer are returned to the user.
+    pipe_t *pipe = new (std::nothrow) pipe_t ();
+    alloc_assert (pipe);
+    *reader_ = new (std::nothrow) reader_t (reader_parent_, pipe, lwm);
+    alloc_assert (*reader_);
+    *writer_ = new (std::nothrow) writer_t (writer_parent_, pipe, *reader_,
+        hwm_, swap_size_);
+    alloc_assert (*writer_);
 }
-
diff --git a/src/pipe.hpp b/src/pipe.hpp
index ece678a..b4a0ffa 100644
--- a/src/pipe.hpp
+++ b/src/pipe.hpp
@@ -1,19 +1,20 @@
 /*
-    Copyright (c) 2007-2010 iMatix Corporation
+    Copyright (c) 2007-2011 iMatix Corporation
+    Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
 
     This file is part of 0MQ.
 
     0MQ is free software; you can redistribute it and/or modify it under
-    the terms of the Lesser GNU General Public License as published by
+    the terms of the GNU Lesser General Public License as published by
     the Free Software Foundation; either version 3 of the License, or
     (at your option) any later version.
 
     0MQ is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    Lesser GNU General Public License for more details.
+    GNU Lesser General Public License for more details.
 
-    You should have received a copy of the Lesser GNU General Public License
+    You should have received a copy of the GNU Lesser General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
@@ -23,25 +24,48 @@
 #include "../include/zmq.h"
 
 #include "stdint.hpp"
-#include "i_endpoint.hpp"
-#include "yarray_item.hpp"
+#include "array.hpp"
 #include "ypipe.hpp"
-#include "msg_store.hpp"
+#include "swap.hpp"
 #include "config.hpp"
 #include "object.hpp"
 
 namespace zmq
 {
 
-    class reader_t : public object_t, public yarray_item_t
+    //  Creates a pipe. Returns pointer to reader and writer objects.
+    void create_pipe (object_t *reader_parent_, object_t *writer_parent_,
+        uint64_t hwm_, int64_t swap_size_, class reader_t **reader_,
+        class writer_t **writer_);
+
+    //  The shutdown mechanism for pipe works as follows: Either endpoint
+    //  (or even both of them) can ask pipe to terminate by calling 'terminate'
+    //  method. Pipe then terminates in asynchronous manner. When the part of
+    //  the shutdown tied to the endpoint is done it triggers 'terminated'
+    //  event. When endpoint processes the event and returns, associated
+    //  reader/writer object is deallocated.
+
+    typedef ypipe_t <zmq_msg_t, message_pipe_granularity> pipe_t;
+
+    struct i_reader_events
     {
-    public:
+        virtual ~i_reader_events () {}
 
-        reader_t (class object_t *parent_, uint64_t lwm_);
-        ~reader_t ();
+        virtual void terminated (class reader_t *pipe_) = 0;
+        virtual void activated (class reader_t *pipe_) = 0;
+        virtual void delimited (class reader_t *pipe_) = 0;
+    };
+
+    class reader_t : public object_t, public array_item_t
+    {
+        friend void create_pipe (object_t*, object_t*, uint64_t,
+            int64_t, reader_t**, writer_t**);
+        friend class writer_t;
+
+    public:
 
-        void set_pipe (class pipe_t *pipe_);
-        void set_endpoint (i_endpoint *endpoint_);
+        //  Specifies the object to get events from the reader.
+        void set_event_sink (i_reader_events *endpoint_);
 
         //  Returns true if there is at least one message to read in the pipe.
         bool check_read ();
@@ -50,22 +74,31 @@ namespace zmq
         bool read (zmq_msg_t *msg_);
 
         //  Ask pipe to terminate.
-        void term ();
+        void terminate ();
 
     private:
 
+        reader_t (class object_t *parent_, pipe_t *pipe_, uint64_t lwm_);
+        ~reader_t ();
+
+        //  To be called only by writer itself!
+        void set_writer (class writer_t *writer_);
+
         //  Command handlers.
-        void process_revive ();
+        void process_activate_reader ();
         void process_pipe_term_ack ();
 
         //  Returns true if the message is delimiter; false otherwise.
         static bool is_delimiter (zmq_msg_t &msg_);
 
+        //  True, if pipe can be read from.
+        bool active;
+
         //  The underlying pipe.
-        class pipe_t *pipe;
+        pipe_t *pipe;
 
         //  Pipe writer associated with the other side of the pipe.
-        class writer_t *peer;
+        class writer_t *writer;
 
         //  Low watermark for in-memory storage (in bytes).
         uint64_t lwm;
@@ -73,27 +106,39 @@ namespace zmq
         //  Number of messages read so far.
         uint64_t msgs_read;
 
-        //  Endpoint (either session or socket) the pipe is attached to.
-        i_endpoint *endpoint;
+        //  Sink for the events (either the socket of the session).
+        i_reader_events *sink;
+
+        //  True is 'terminate' method was called or delimiter
+        //  was read from the pipe.
+        bool terminating;
 
         reader_t (const reader_t&);
-        void operator = (const reader_t&);
+        const reader_t &operator = (const reader_t&);
     };
 
-    class writer_t : public object_t, public yarray_item_t
+    struct i_writer_events
     {
-    public:
+        virtual ~i_writer_events () {}
 
-        writer_t (class object_t *parent_, uint64_t hwm_, int64_t swap_size_);
-        ~writer_t ();
+        virtual void terminated (class writer_t *pipe_) = 0;
+        virtual void activated (class writer_t *pipe_) = 0;
+    };
 
-        void set_pipe (class pipe_t *pipe_);
-        void set_endpoint (i_endpoint *endpoint_);
+    class writer_t : public object_t, public array_item_t
+    {
+        friend void create_pipe (object_t*, object_t*, uint64_t,
+            int64_t, reader_t**, writer_t**);
+
+    public:
 
-        //  Checks whether a message can be written to the pipe.
-        //  If writing the message would cause high watermark to be
-        //  exceeded, the function returns false.
-        bool check_write ();
+        //  Specifies the object to get events from the writer.
+        void set_event_sink (i_writer_events *endpoint_);
+
+        //  Checks whether messages can be written to the pipe.
+        //  If writing the message would cause high watermark and (optionally)
+        //  if the swap is full, the function returns false.
+        bool check_write (zmq_msg_t *msg_);
 
         //  Writes a message to the underlying pipe. Returns false if the
         //  message cannot be written because high watermark was reached.
@@ -106,27 +151,31 @@ namespace zmq
         void flush ();
 
         //  Ask pipe to terminate.
-        void term ();
+        void terminate ();
 
     private:
 
-        void process_reader_info (uint64_t msgs_read_);
+        writer_t (class object_t *parent_, pipe_t *pipe_, reader_t *reader_,
+            uint64_t hwm_, int64_t swap_size_);
+        ~writer_t ();
 
         //  Command handlers.
+        void process_activate_writer (uint64_t msgs_read_);
         void process_pipe_term ();
 
-        //  Tests whether the pipe is already full.
+        //  Tests whether underlying pipe is already full. The swap is not
+        //  taken into account.
         bool pipe_full ();
 
-        //  Write special message to the pipe so that the reader
-        //  can find out we are finished.
-        void write_delimiter ();
+        //  True, if this object can be written to. Undelying ypipe may be full
+        //  but as long as there's swap space available, this flag is true.
+        bool active;
 
         //  The underlying pipe.
-        class pipe_t *pipe;
+        pipe_t *pipe;
 
         //  Pipe reader associated with the other side of the pipe.
-        class reader_t *peer;
+        reader_t *reader;
 
         //  High watermark for in-memory storage (in bytes).
         uint64_t hwm;
@@ -138,44 +187,26 @@ namespace zmq
         //  Number of messages we have written so far.
         uint64_t msgs_written;
 
-        //  Pointer to backing store. If NULL, messages are always
+        //  Pointer to the message swap. If NULL, messages are always
         //  kept in main memory.
-        msg_store_t *msg_store;
-
-        bool extra_msg_flag;
+        swap_t *swap;
 
-        zmq_msg_t extra_msg;
+        //  Sink for the events (either the socket or the session).
+        i_writer_events *sink;
 
-        //  True iff the last attempt to write a message has failed.
-        bool stalled;
+        //  If true, swap is active. New messages are to be written to the swap.
+        bool swapping;
 
-        bool pending_close;
+        //  If true, there's a delimiter to be written to the pipe after the
+        //  swap is empied.
+        bool pending_delimiter;
 
-        //  Endpoint (either session or socket) the pipe is attached to.
-        i_endpoint *endpoint;
+        //  True is 'terminate' method was called of 'pipe_term' command
+        //  arrived from the reader.
+        bool terminating;
 
         writer_t (const writer_t&);
-        void operator = (const writer_t&);
-    };
-
-    //  Message pipe.
-    class pipe_t : public ypipe_t <zmq_msg_t, message_pipe_granularity>
-    {
-    public:
-
-        pipe_t (object_t *reader_parent_, object_t *writer_parent_,
-            uint64_t hwm_, int64_t swap_size_);
-        ~pipe_t ();
-
-        reader_t reader;
-        writer_t writer;
-
-    private:
-
-        uint64_t compute_lwm (uint64_t hwm_);
-
-        pipe_t (const pipe_t&);
-        void operator = (const pipe_t&);
+        const writer_t &operator = (const writer_t&);
     };
 
 }
diff --git a/src/platform.hpp.in b/src/platform.hpp.in
index 1f47133..09943ee 100644
--- a/src/platform.hpp.in
+++ b/src/platform.hpp.in
@@ -1,11 +1,17 @@
 /* src/platform.hpp.in.  Generated from configure.in by autoheader.  */
 
+/* Define to 1 if you have the <alloca.h> header file. */
+#undef HAVE_ALLOCA_H
+
 /* Define to 1 if you have the <arpa/inet.h> header file. */
 #undef HAVE_ARPA_INET_H
 
 /* Define to 1 if you have the <dlfcn.h> header file. */
 #undef HAVE_DLFCN_H
 
+/* Define to 1 if you have the `epoll_create' function. */
+#undef HAVE_EPOLL_CREATE
+
 /* Define to 1 if you have the <errno.h> header file. */
 #undef HAVE_ERRNO_H
 
@@ -15,6 +21,15 @@
 /* Define to 1 if you have the `getifaddrs' function. */
 #undef HAVE_GETIFADDRS
 
+/* Define to 1 if you have the `getopt' function. */
+#undef HAVE_GETOPT
+
+/* Define to 1 if you have the `getprotobyname_r' function. */
+#undef HAVE_GETPROTOBYNAME_R
+
+/* Define to 1 if you have the `getprotobyname_r2' function. */
+#undef HAVE_GETPROTOBYNAME_R2
+
 /* Define to 1 if you have the `gettimeofday' function. */
 #undef HAVE_GETTIMEOFDAY
 
@@ -69,6 +84,12 @@
 /* Define to 1 if you have the `perror' function. */
 #undef HAVE_PERROR
 
+/* Define to 1 if you have the `poll' function. */
+#undef HAVE_POLL
+
+/* Define to 1 if you have the `pselect' function. */
+#undef HAVE_PSELECT
+
 /* Define to 1 if you have the `socket' function. */
 #undef HAVE_SOCKET
 
@@ -105,6 +126,9 @@
 /* Define to 1 if you have the <unistd.h> header file. */
 #undef HAVE_UNISTD_H
 
+/* Define to 1 if you have the `vasprintf' function. */
+#undef HAVE_VASPRINTF
+
 /* Define to 1 if you have the <windows.h> header file. */
 #undef HAVE_WINDOWS_H
 
diff --git a/src/poll.cpp b/src/poll.cpp
index 1b203db..6a84d2e 100644
--- a/src/poll.cpp
+++ b/src/poll.cpp
@@ -1,19 +1,20 @@
 /*
-    Copyright (c) 2007-2010 iMatix Corporation
+    Copyright (c) 2007-2011 iMatix Corporation
+    Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
 
     This file is part of 0MQ.
 
     0MQ is free software; you can redistribute it and/or modify it under
-    the terms of the Lesser GNU General Public License as published by
+    the terms of the GNU Lesser General Public License as published by
     the Free Software Foundation; either version 3 of the License, or
     (at your option) any later version.
 
     0MQ is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    Lesser GNU General Public License for more details.
+    GNU Lesser General Public License for more details.
 
-    You should have received a copy of the Lesser GNU General Public License
+    You should have received a copy of the GNU Lesser General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
@@ -27,7 +28,6 @@
 
 #include <sys/types.h>
 #include <sys/time.h>
-#include <sys/resource.h>
 #include <poll.h>
 #include <algorithm>
 
@@ -40,27 +40,25 @@ zmq::poll_t::poll_t () :
     retired (false),
     stopping (false)
 {
-    //  Get the limit on open file descriptors. Resize fds so that it
-    //  can hold all descriptors.
-    rlimit rl;
-    int rc = getrlimit (RLIMIT_NOFILE, &rl);
-    errno_assert (rc != -1);
-    fd_table.resize (rl.rlim_cur);
-
-    for (rlim_t i = 0; i < rl.rlim_cur; i ++)
-        fd_table [i].index = retired_fd;
 }
 
 zmq::poll_t::~poll_t ()
 {
     worker.stop ();
-
-    //  Make sure there are no fds registered on shutdown.
-    zmq_assert (load.get () == 0);
 }
 
 zmq::poll_t::handle_t zmq::poll_t::add_fd (fd_t fd_, i_poll_events *events_)
 {
+    //  If the file descriptor table is too small expand it.
+    fd_table_t::size_type sz = fd_table.size ();
+    if (sz <= (fd_table_t::size_type) fd_) {
+        fd_table.resize (fd_ + 1);
+        while (sz != (fd_table_t::size_type) (fd_ + 1)) {
+            fd_table [sz].index = retired_fd;
+            ++sz;
+        }
+    }
+
     pollfd pfd = {fd_, 0, 0};
     pollset.push_back (pfd);
     assert (fd_table [fd_].index == retired_fd);
@@ -69,7 +67,7 @@ zmq::poll_t::handle_t zmq::poll_t::add_fd (fd_t fd_, i_poll_events *events_)
     fd_table [fd_].events = events_;
 
     //  Increase the load metric of the thread.
-    load.add (1);
+    adjust_load (1);
 
     return fd_;
 }
@@ -85,7 +83,7 @@ void zmq::poll_t::rm_fd (handle_t handle_)
     retired = true;
 
     //  Decrease the load metric of the thread.
-    load.sub (1);
+    adjust_load (-1);
 }
 
 void zmq::poll_t::set_pollin (handle_t handle_)
@@ -112,23 +110,6 @@ void zmq::poll_t::reset_pollout (handle_t handle_)
     pollset [index].events &= ~((short) POLLOUT);
 }
 
-void zmq::poll_t::add_timer (i_poll_events *events_)
-{
-     timers.push_back (events_);
-}
-
-void zmq::poll_t::cancel_timer (i_poll_events *events_)
-{
-    timers_t::iterator it = std::find (timers.begin (), timers.end (), events_);
-    if (it != timers.end ())
-        timers.erase (it);
-}
-
-int zmq::poll_t::get_load ()
-{
-    return load.get ();
-}
-
 void zmq::poll_t::start ()
 {
     worker.start (worker_routine, this);
@@ -143,27 +124,20 @@ void zmq::poll_t::loop ()
 {
     while (!stopping) {
 
+        //  Execute any due timers.
+        int timeout = (int) execute_timers ();
+
         //  Wait for events.
-        int rc = poll (&pollset [0], pollset.size (),
-            timers.empty () ? -1 : max_timer_period);
+        int rc = poll (&pollset [0], pollset.size (), timeout ? timeout : -1);
         if (rc == -1 && errno == EINTR)
             continue;
         errno_assert (rc != -1);
 
-        //  Handle timer.
-        if (!rc) {
-
-            //  Use local list of timers as timer handlers may fill new timers
-            //  into the original array.
-            timers_t t;
-            std::swap (timers, t);
-
-            //  Trigger all the timers.
-            for (timers_t::iterator it = t.begin (); it != t.end (); it ++)
-                (*it)->timer_event ();
 
+        //  If there are no events (i.e. it's a timeout) there's no point
+        //  in checking the pollset.
+        if (rc == 0)
             continue;
-        }
 
         for (pollset_t::size_type i = 0; i != pollset.size (); i++) {
 
diff --git a/src/poll.hpp b/src/poll.hpp
index f4ae35a..3a18d03 100644
--- a/src/poll.hpp
+++ b/src/poll.hpp
@@ -1,19 +1,20 @@
 /*
-    Copyright (c) 2007-2010 iMatix Corporation
+    Copyright (c) 2007-2011 iMatix Corporation
+    Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
 
     This file is part of 0MQ.
 
     0MQ is free software; you can redistribute it and/or modify it under
-    the terms of the Lesser GNU General Public License as published by
+    the terms of the GNU Lesser General Public License as published by
     the Free Software Foundation; either version 3 of the License, or
     (at your option) any later version.
 
     0MQ is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    Lesser GNU General Public License for more details.
+    GNU Lesser General Public License for more details.
 
-    You should have received a copy of the Lesser GNU General Public License
+    You should have received a copy of the GNU Lesser General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
@@ -34,7 +35,7 @@
 
 #include "fd.hpp"
 #include "thread.hpp"
-#include "atomic_counter.hpp"
+#include "poller_base.hpp"
 
 namespace zmq
 {
@@ -42,7 +43,7 @@ namespace zmq
     //  Implements socket polling mechanism using the POSIX.1-2001
     //  poll() system call.
 
-    class poll_t
+    class poll_t : public poller_base_t
     {
     public:
 
@@ -58,9 +59,6 @@ namespace zmq
         void reset_pollin (handle_t handle_);
         void set_pollout (handle_t handle_);
         void reset_pollout (handle_t handle_);
-        void add_timer (struct i_poll_events *events_);
-        void cancel_timer (struct i_poll_events *events_);
-        int get_load ();
         void start ();
         void stop ();
 
@@ -79,7 +77,8 @@ namespace zmq
         };
 
         //  This table stores data for registered descriptors.
-        std::vector <fd_entry_t> fd_table;
+        typedef std::vector <fd_entry_t> fd_table_t;
+        fd_table_t fd_table;
 
         //  Pollset to pass to the poll function.
         typedef std::vector <pollfd> pollset_t;
@@ -88,22 +87,14 @@ namespace zmq
         //  If true, there's at least one retired event source.
         bool retired;
 
-        //  List of all the engines waiting for the timer event.
-        typedef std::vector <struct i_poll_events*> timers_t;
-        timers_t timers;
-
         //  If true, thread is in the process of shutting down.
         bool stopping;
 
         //  Handle of the physical thread doing the I/O work.
         thread_t worker;
 
-        //  Load of the poller. Currently number of file descriptors
-        //  registered with the poller.
-        atomic_counter_t load;
-
         poll_t (const poll_t&);
-        void operator = (const poll_t&);
+        const poll_t &operator = (const poll_t&);
     };
 
 }
diff --git a/src/poller.hpp b/src/poller.hpp
index 3c29603..10fafb9 100644
--- a/src/poller.hpp
+++ b/src/poller.hpp
@@ -1,19 +1,20 @@
 /*
-    Copyright (c) 2007-2010 iMatix Corporation
+    Copyright (c) 2007-2011 iMatix Corporation
+    Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
 
     This file is part of 0MQ.
 
     0MQ is free software; you can redistribute it and/or modify it under
-    the terms of the Lesser GNU General Public License as published by
+    the terms of the GNU Lesser General Public License as published by
     the Free Software Foundation; either version 3 of the License, or
     (at your option) any later version.
 
     0MQ is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    Lesser GNU General Public License for more details.
+    GNU Lesser General Public License for more details.
 
-    You should have received a copy of the Lesser GNU General Public License
+    You should have received a copy of the GNU Lesser General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
diff --git a/src/poller_base.cpp b/src/poller_base.cpp
new file mode 100644
index 0000000..d5fb985
--- /dev/null
+++ b/src/poller_base.cpp
@@ -0,0 +1,99 @@
+/*
+    Copyright (c) 2007-2011 iMatix Corporation
+    Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
+
+    This file is part of 0MQ.
+
+    0MQ is free software; you can redistribute it and/or modify it under
+    the terms of the GNU Lesser General Public License as published by
+    the Free Software Foundation; either version 3 of the License, or
+    (at your option) any later version.
+
+    0MQ is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU Lesser General Public License for more details.
+
+    You should have received a copy of the GNU Lesser General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "poller_base.hpp"
+#include "i_poll_events.hpp"
+#include "err.hpp"
+
+zmq::poller_base_t::poller_base_t ()
+{
+}
+
+zmq::poller_base_t::~poller_base_t ()
+{
+    //  Make sure there is no more load on the shutdown.
+    zmq_assert (get_load () == 0);
+}
+
+int zmq::poller_base_t::get_load ()
+{
+    return load.get ();
+}
+
+void zmq::poller_base_t::adjust_load (int amount_)
+{
+    if (amount_ > 0)
+        load.add (amount_);
+    else if (amount_ < 0)
+        load.sub (-amount_);
+}
+
+void zmq::poller_base_t::add_timer (int timeout_, i_poll_events *sink_, int id_)
+{
+    uint64_t expiration = clock.now_ms () + timeout_;
+    timer_info_t info = {sink_, id_};
+    timers.insert (timers_t::value_type (expiration, info));
+}
+
+void zmq::poller_base_t::cancel_timer (i_poll_events *sink_, int id_)
+{
+    //  Complexity of this operation is O(n). We assume it is rarely used.
+    for (timers_t::iterator it = timers.begin (); it != timers.end (); ++it)
+        if (it->second.sink == sink_ && it->second.id == id_) {
+            timers.erase (it);
+            return;
+        }
+
+    //  Timer not found.
+    zmq_assert (false);
+}
+
+uint64_t zmq::poller_base_t::execute_timers ()
+{
+    //  Fast track.
+    if (timers.empty ())
+        return 0;
+
+    //  Get the current time.
+    uint64_t current = clock.now_ms ();
+
+    //   Execute the timers that are already due.
+    timers_t::iterator it = timers.begin ();
+    while (it != timers.end ()) {
+
+        //  If we have to wait to execute the item, same will be true about
+        //  all the following items (multimap is sorted). Thus we can stop
+        //  checking the subsequent timers and return the time to wait for
+        //  the next timer (at least 1ms).
+        if (it->first > current)
+            return it->first - current;
+
+        //  Trigger the timer.
+        it->second.sink->timer_event (it->second.id);
+
+        //  Remove it from the list of active timers.
+        timers_t::iterator o = it;
+        ++it;
+        timers.erase (o);
+    }
+
+    //  There are no more timers.
+    return 0;
+}
diff --git a/src/poller_base.hpp b/src/poller_base.hpp
new file mode 100644
index 0000000..44fe9f1
--- /dev/null
+++ b/src/poller_base.hpp
@@ -0,0 +1,84 @@
+/*
+    Copyright (c) 2007-2011 iMatix Corporation
+    Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
+
+    This file is part of 0MQ.
+
+    0MQ is free software; you can redistribute it and/or modify it under
+    the terms of the GNU Lesser General Public License as published by
+    the Free Software Foundation; either version 3 of the License, or
+    (at your option) any later version.
+
+    0MQ is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU Lesser General Public License for more details.
+
+    You should have received a copy of the GNU Lesser General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef __ZMQ_POLLER_BASE_HPP_INCLUDED__
+#define __ZMQ_POLLER_BASE_HPP_INCLUDED__
+
+#include <map>
+
+#include "clock.hpp"
+#include "atomic_counter.hpp"
+
+namespace zmq
+{
+
+    class poller_base_t
+    {
+    public:
+
+        poller_base_t ();
+        virtual ~poller_base_t ();
+
+        //  Returns load of the poller. Note that this function can be
+        //  invoked from a different thread!
+        int get_load ();
+
+        //  Add a timeout to expire in timeout_ milliseconds. After the
+        //  expiration timer_event on sink_ object will be called with
+        //  argument set to id_.
+        void add_timer (int timeout_, struct i_poll_events *sink_, int id_);
+
+        //  Cancel the timer created by sink_ object with ID equal to id_.
+        void cancel_timer (struct i_poll_events *sink_, int id_);
+
+    protected:
+
+        //  Called by individual poller implementations to manage the load.
+        void adjust_load (int amount_);
+
+        //  Executes any timers that are due. Returns number of milliseconds
+        //  to wait to match the next timer or 0 meaning "no timers".
+        uint64_t execute_timers ();
+
+    private:
+
+        //  Clock instance private to this I/O thread.
+        clock_t clock;
+
+        //  List of active timers.
+        struct timer_info_t
+        {
+            struct i_poll_events *sink;
+            int id;
+        };
+        typedef std::multimap <uint64_t, timer_info_t> timers_t;
+        timers_t timers;
+
+        //  Load of the poller. Currently the number of file descriptors
+        //  registered.
+        atomic_counter_t load;
+
+        poller_base_t (const poller_base_t&);
+        const poller_base_t &operator = (const poller_base_t&);
+    };
+
+}
+
+#endif
diff --git a/src/pub.cpp b/src/pub.cpp
index 4e73b19..74f07fc 100644
--- a/src/pub.cpp
+++ b/src/pub.cpp
@@ -1,177 +1,31 @@
 /*
-    Copyright (c) 2007-2010 iMatix Corporation
+    Copyright (c) 2007-2011 iMatix Corporation
+    Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
 
     This file is part of 0MQ.
 
     0MQ is free software; you can redistribute it and/or modify it under
-    the terms of the Lesser GNU General Public License as published by
+    the terms of the GNU Lesser General Public License as published by
     the Free Software Foundation; either version 3 of the License, or
     (at your option) any later version.
 
     0MQ is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    Lesser GNU General Public License for more details.
+    GNU Lesser General Public License for more details.
 
-    You should have received a copy of the Lesser GNU General Public License
+    You should have received a copy of the GNU Lesser General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
-#include "../include/zmq.h"
-
 #include "pub.hpp"
-#include "err.hpp"
-#include "msg_content.hpp"
-#include "pipe.hpp"
 
-zmq::pub_t::pub_t (class app_thread_t *parent_) :
-    socket_base_t (parent_),
-    active (0)
+zmq::pub_t::pub_t (class ctx_t *parent_, uint32_t tid_) :
+    xpub_t (parent_, tid_)
 {
-    options.requires_in = false;
-    options.requires_out = true;
+    options.type = ZMQ_PUB;
 }
 
 zmq::pub_t::~pub_t ()
 {
-    for (pipes_t::size_type i = 0; i != pipes.size (); i++)
-        pipes [i]->term ();
-    pipes.clear ();
-}
-
-void zmq::pub_t::xattach_pipes (class reader_t *inpipe_,
-    class writer_t *outpipe_, const blob_t &peer_identity_)
-{
-    zmq_assert (!inpipe_);
-    pipes.push_back (outpipe_);
-    pipes.swap (active, pipes.size () - 1);
-    active++;
-}
-
-void zmq::pub_t::xdetach_inpipe (class reader_t *pipe_)
-{
-    zmq_assert (false);
-}
-
-void zmq::pub_t::xdetach_outpipe (class writer_t *pipe_)
-{
-    //  Remove the pipe from the list; adjust number of active pipes
-    //  accordingly.
-    if (pipes.index (pipe_) < active)
-        active--;
-    pipes.erase (pipe_);
 }
-
-void zmq::pub_t::xkill (class reader_t *pipe_)
-{
-    zmq_assert (false);
-}
-
-void zmq::pub_t::xrevive (class reader_t *pipe_)
-{
-    zmq_assert (false);
-}
-
-void zmq::pub_t::xrevive (class writer_t *pipe_)
-{
-    //  Move the pipe to the list of active pipes.
-    pipes.swap (pipes.index (pipe_), active);
-    active++;
-}
-
-int zmq::pub_t::xsetsockopt (int option_, const void *optval_,
-    size_t optvallen_)
-{
-    errno = EINVAL;
-    return -1;
-}
-
-int zmq::pub_t::xsend (zmq_msg_t *msg_, int flags_)
-{
-    //  If there are no active pipes available, simply drop the message.
-    if (active == 0) {
-        int rc = zmq_msg_close (msg_);
-        zmq_assert (rc == 0);
-        rc = zmq_msg_init (msg_);
-        zmq_assert (rc == 0);
-        return 0;
-    }
-
-    msg_content_t *content = (msg_content_t*) msg_->content;
-
-    //  For VSMs the copying is straighforward.
-    if (content == (msg_content_t*) ZMQ_VSM) {
-        for (pipes_t::size_type i = 0; i != active;)
-            if (write (pipes [i], msg_))
-                i++;
-        int rc = zmq_msg_init (msg_);
-        zmq_assert (rc == 0);
-        return 0;
-    }
-
-    //  Optimisation for the case when there's only a single pipe
-    //  to send the message to - no refcount adjustment i.e. no atomic
-    //  operations are needed.
-    if (active == 1) {
-        if (!write (pipes [0], msg_)) {
-            int rc = zmq_msg_close (msg_);
-            zmq_assert (rc == 0);
-        }
-        int rc = zmq_msg_init (msg_);
-        zmq_assert (rc == 0);
-        return 0;
-    }
-
-    //  There are at least 2 destinations for the message. That means we have
-    //  to deal with reference counting. First add N-1 references to
-    //  the content (we are holding one reference anyway, that's why -1).
-    if (msg_->flags & ZMQ_MSG_SHARED)
-        content->refcnt.add (active - 1);
-    else {
-        content->refcnt.set (active);
-        msg_->flags |= ZMQ_MSG_SHARED;
-    }
-
-    //  Push the message to all destinations.
-    for (pipes_t::size_type i = 0; i != active;) {
-        if (!write (pipes [i], msg_))
-            content->refcnt.sub (1);
-        else
-            i++;
-    }
-
-    //  Detach the original message from the data buffer.
-    int rc = zmq_msg_init (msg_);
-    zmq_assert (rc == 0);
-
-    return 0;
-}
-
-int zmq::pub_t::xrecv (zmq_msg_t *msg_, int flags_)
-{
-    errno = ENOTSUP;
-    return -1;
-}
-
-bool zmq::pub_t::xhas_in ()
-{
-    return false;
-}
-
-bool zmq::pub_t::xhas_out ()
-{
-    return true;
-}
-
-bool zmq::pub_t::write (class writer_t *pipe_, zmq_msg_t *msg_)
-{
-    if (!pipe_->write (msg_)) {
-        active--;
-        pipes.swap (pipes.index (pipe_), active);
-        return false;
-    }
-    if (!(msg_->flags & ZMQ_MSG_MORE))
-        pipe_->flush ();
-    return true;
-}
-
diff --git a/src/pub.hpp b/src/pub.hpp
index ac3924a..e69af3c 100644
--- a/src/pub.hpp
+++ b/src/pub.hpp
@@ -1,68 +1,42 @@
 /*
-    Copyright (c) 2007-2010 iMatix Corporation
+    Copyright (c) 2007-2011 iMatix Corporation
+    Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
 
     This file is part of 0MQ.
 
     0MQ is free software; you can redistribute it and/or modify it under
-    the terms of the Lesser GNU General Public License as published by
+    the terms of the GNU Lesser General Public License as published by
     the Free Software Foundation; either version 3 of the License, or
     (at your option) any later version.
 
     0MQ is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    Lesser GNU General Public License for more details.
+    GNU Lesser General Public License for more details.
 
-    You should have received a copy of the Lesser GNU General Public License
+    You should have received a copy of the GNU Lesser General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
 #ifndef __ZMQ_PUB_HPP_INCLUDED__
 #define __ZMQ_PUB_HPP_INCLUDED__
 
-#include "socket_base.hpp"
-#include "yarray.hpp"
+#include "xpub.hpp"
 
 namespace zmq
 {
 
-    class pub_t : public socket_base_t
+    class pub_t : public xpub_t
     {
     public:
 
-        pub_t (class app_thread_t *parent_);
+        pub_t (class ctx_t *parent_, uint32_t tid_);
         ~pub_t ();
 
-        //  Overloads of functions from socket_base_t.
-        void xattach_pipes (class reader_t *inpipe_, class writer_t *outpipe_,
-            const blob_t &peer_identity_);
-        void xdetach_inpipe (class reader_t *pipe_);
-        void xdetach_outpipe (class writer_t *pipe_);
-        void xkill (class reader_t *pipe_);
-        void xrevive (class reader_t *pipe_);
-        void xrevive (class writer_t *pipe_);
-        int xsetsockopt (int option_, const void *optval_, size_t optvallen_);
-        int xsend (zmq_msg_t *msg_, int flags_);
-        int xrecv (zmq_msg_t *msg_, int flags_);
-        bool xhas_in ();
-        bool xhas_out ();
-
     private:
 
-        //  Write the message to the pipe. Make the pipe inactive if writing
-        //  fails. In such a case false is returned.
-        bool write (class writer_t *pipe_, zmq_msg_t *msg_);
-
-        //  Outbound pipes, i.e. those the socket is sending messages to.
-        typedef yarray_t <class writer_t> pipes_t;
-        pipes_t pipes;
-
-        //  Number of active pipes. All the active pipes are located at the
-        //  beginning of the pipes array.
-        pipes_t::size_type active;
-
         pub_t (const pub_t&);
-        void operator = (const pub_t&);
+        const pub_t &operator = (const pub_t&);
     };
 
 }
diff --git a/src/pull.cpp b/src/pull.cpp
index b2413ee..a8c2466 100644
--- a/src/pull.cpp
+++ b/src/pull.cpp
@@ -1,19 +1,20 @@
 /*
-    Copyright (c) 2007-2010 iMatix Corporation
+    Copyright (c) 2007-2011 iMatix Corporation
+    Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
 
     This file is part of 0MQ.
 
     0MQ is free software; you can redistribute it and/or modify it under
-    the terms of the Lesser GNU General Public License as published by
+    the terms of the GNU Lesser General Public License as published by
     the Free Software Foundation; either version 3 of the License, or
     (at your option) any later version.
 
     0MQ is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    Lesser GNU General Public License for more details.
+    GNU Lesser General Public License for more details.
 
-    You should have received a copy of the Lesser GNU General Public License
+    You should have received a copy of the GNU Lesser General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
@@ -22,9 +23,11 @@
 #include "pull.hpp"
 #include "err.hpp"
 
-zmq::pull_t::pull_t (class app_thread_t *parent_) :
-    socket_base_t (parent_)
+zmq::pull_t::pull_t (class ctx_t *parent_, uint32_t tid_) :
+    socket_base_t (parent_, tid_),
+    fq (this)
 {
+    options.type = ZMQ_PULL;
     options.requires_in = true;
     options.requires_out = false;
 }
@@ -40,45 +43,10 @@ void zmq::pull_t::xattach_pipes (class reader_t *inpipe_,
     fq.attach (inpipe_);
 }
 
-void zmq::pull_t::xdetach_inpipe (class reader_t *pipe_)
+void zmq::pull_t::process_term (int linger_)
 {
-    zmq_assert (pipe_);
-    fq.detach (pipe_);
-}
-
-void zmq::pull_t::xdetach_outpipe (class writer_t *pipe_)
-{
-    //  There are no outpipes, so this function shouldn't be called at all.
-    zmq_assert (false);
-}
-
-void zmq::pull_t::xkill (class reader_t *pipe_)
-{
-    fq.kill (pipe_);
-}
-
-void zmq::pull_t::xrevive (class reader_t *pipe_)
-{
-    fq.revive (pipe_);
-}
-
-void zmq::pull_t::xrevive (class writer_t *pipe_)
-{
-    zmq_assert (false);
-}
-
-int zmq::pull_t::xsetsockopt (int option_, const void *optval_,
-    size_t optvallen_)
-{
-    //  No special options for this socket type.
-    errno = EINVAL;
-    return -1;
-}
-
-int zmq::pull_t::xsend (zmq_msg_t *msg_, int flags_)
-{
-    errno = ENOTSUP;
-    return -1;
+    fq.terminate ();
+    socket_base_t::process_term (linger_);
 }
 
 int zmq::pull_t::xrecv (zmq_msg_t *msg_, int flags_)
@@ -91,8 +59,3 @@ bool zmq::pull_t::xhas_in ()
     return fq.has_in ();
 }
 
-bool zmq::pull_t::xhas_out ()
-{
-    return false;
-}
-
diff --git a/src/pull.hpp b/src/pull.hpp
index 7f249e9..95084ba 100644
--- a/src/pull.hpp
+++ b/src/pull.hpp
@@ -1,19 +1,20 @@
 /*
-    Copyright (c) 2007-2010 iMatix Corporation
+    Copyright (c) 2007-2011 iMatix Corporation
+    Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
 
     This file is part of 0MQ.
 
     0MQ is free software; you can redistribute it and/or modify it under
-    the terms of the Lesser GNU General Public License as published by
+    the terms of the GNU Lesser General Public License as published by
     the Free Software Foundation; either version 3 of the License, or
     (at your option) any later version.
 
     0MQ is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    Lesser GNU General Public License for more details.
+    GNU Lesser General Public License for more details.
 
-    You should have received a copy of the Lesser GNU General Public License
+    You should have received a copy of the GNU Lesser General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
@@ -30,30 +31,27 @@ namespace zmq
     {
     public:
 
-        pull_t (class app_thread_t *parent_);
+        pull_t (class ctx_t *parent_, uint32_t tid_);
         ~pull_t ();
 
+    protected:
+
         //  Overloads of functions from socket_base_t.
         void xattach_pipes (class reader_t *inpipe_, class writer_t *outpipe_,
             const blob_t &peer_identity_);
-        void xdetach_inpipe (class reader_t *pipe_);
-        void xdetach_outpipe (class writer_t *pipe_);
-        void xkill (class reader_t *pipe_);
-        void xrevive (class reader_t *pipe_);
-        void xrevive (class writer_t *pipe_);
-        int xsetsockopt (int option_, const void *optval_, size_t optvallen_);
-        int xsend (zmq_msg_t *msg_, int flags_);
         int xrecv (zmq_msg_t *msg_, int flags_);
         bool xhas_in ();
-        bool xhas_out ();
 
     private:
 
+        //  Hook into the termination process.
+        void process_term (int linger_);
+
         //  Fair queueing object for inbound pipes.
         fq_t fq;
 
         pull_t (const pull_t&);
-        void operator = (const pull_t&);
+        const pull_t &operator = (const pull_t&);
 
     };
 
diff --git a/src/push.cpp b/src/push.cpp
index 522101f..072994f 100644
--- a/src/push.cpp
+++ b/src/push.cpp
@@ -1,19 +1,20 @@
 /*
-    Copyright (c) 2007-2010 iMatix Corporation
+    Copyright (c) 2007-2011 iMatix Corporation
+    Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
 
     This file is part of 0MQ.
 
     0MQ is free software; you can redistribute it and/or modify it under
-    the terms of the Lesser GNU General Public License as published by
+    the terms of the GNU Lesser General Public License as published by
     the Free Software Foundation; either version 3 of the License, or
     (at your option) any later version.
 
     0MQ is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    Lesser GNU General Public License for more details.
+    GNU Lesser General Public License for more details.
 
-    You should have received a copy of the Lesser GNU General Public License
+    You should have received a copy of the GNU Lesser General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
@@ -23,9 +24,11 @@
 #include "err.hpp"
 #include "pipe.hpp"
 
-zmq::push_t::push_t (class app_thread_t *parent_) :
-    socket_base_t (parent_)
+zmq::push_t::push_t (class ctx_t *parent_, uint32_t tid_) :
+    socket_base_t (parent_, tid_),
+    lb (this)
 {
+    options.type = ZMQ_PUSH;
     options.requires_in = false;
     options.requires_out = true;
 }
@@ -41,41 +44,10 @@ void zmq::push_t::xattach_pipes (class reader_t *inpipe_,
     lb.attach (outpipe_);
 }
 
-void zmq::push_t::xdetach_inpipe (class reader_t *pipe_)
+void zmq::push_t::process_term (int linger_)
 {
-    //  There are no inpipes, so this function shouldn't be called at all.
-    zmq_assert (false);
-}
-
-void zmq::push_t::xdetach_outpipe (class writer_t *pipe_)
-{
-    zmq_assert (pipe_);
-    lb.detach (pipe_);
-}
-
-void zmq::push_t::xkill (class reader_t *pipe_)
-{
-    //  There are no inpipes, so this function shouldn't be called at all.
-    zmq_assert (false);
-}
-
-void zmq::push_t::xrevive (class reader_t *pipe_)
-{
-    //  There are no inpipes, so this function shouldn't be called at all.
-    zmq_assert (false);
-}
-
-void zmq::push_t::xrevive (class writer_t *pipe_)
-{
-    lb.revive (pipe_);
-}
-
-int zmq::push_t::xsetsockopt (int option_, const void *optval_,
-    size_t optvallen_)
-{
-    //  No special option for this socket type.
-    errno = EINVAL;
-    return -1;
+    lb.terminate ();
+    socket_base_t::process_term (linger_);
 }
 
 int zmq::push_t::xsend (zmq_msg_t *msg_, int flags_)
@@ -83,17 +55,6 @@ int zmq::push_t::xsend (zmq_msg_t *msg_, int flags_)
     return lb.send (msg_, flags_);
 }
 
-int zmq::push_t::xrecv (zmq_msg_t *msg_, int flags_)
-{
-    errno = ENOTSUP;
-    return -1;
-}
-
-bool zmq::push_t::xhas_in ()
-{
-    return false;
-}
-
 bool zmq::push_t::xhas_out ()
 {
     return lb.has_out ();
diff --git a/src/push.hpp b/src/push.hpp
index b3c8d87..f04b25f 100644
--- a/src/push.hpp
+++ b/src/push.hpp
@@ -1,19 +1,20 @@
 /*
-    Copyright (c) 2007-2010 iMatix Corporation
+    Copyright (c) 2007-2011 iMatix Corporation
+    Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
 
     This file is part of 0MQ.
 
     0MQ is free software; you can redistribute it and/or modify it under
-    the terms of the Lesser GNU General Public License as published by
+    the terms of the GNU Lesser General Public License as published by
     the Free Software Foundation; either version 3 of the License, or
     (at your option) any later version.
 
     0MQ is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    Lesser GNU General Public License for more details.
+    GNU Lesser General Public License for more details.
 
-    You should have received a copy of the Lesser GNU General Public License
+    You should have received a copy of the GNU Lesser General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
@@ -30,30 +31,27 @@ namespace zmq
     {
     public:
 
-        push_t (class app_thread_t *parent_);
+        push_t (class ctx_t *parent_, uint32_t tid_);
         ~push_t ();
 
+    protected:
+
         //  Overloads of functions from socket_base_t.
         void xattach_pipes (class reader_t *inpipe_, class writer_t *outpipe_,
             const blob_t &peer_identity_);
-        void xdetach_inpipe (class reader_t *pipe_);
-        void xdetach_outpipe (class writer_t *pipe_);
-        void xkill (class reader_t *pipe_);
-        void xrevive (class reader_t *pipe_);
-        void xrevive (class writer_t *pipe_);
-        int xsetsockopt (int option_, const void *optval_, size_t optvallen_);
         int xsend (zmq_msg_t *msg_, int flags_);
-        int xrecv (zmq_msg_t *msg_, int flags_);
-        bool xhas_in ();
         bool xhas_out ();
 
     private:
 
+        //  Hook into the termination process.
+        void process_term (int linger_);
+
         //  Load balancer managing the outbound pipes.
         lb_t lb;
 
         push_t (const push_t&);
-        void operator = (const push_t&);
+        const push_t &operator = (const push_t&);
     };
 
 }
diff --git a/src/queue.hpp b/src/queue.hpp
deleted file mode 100644
index dc968cb..0000000
--- a/src/queue.hpp
+++ /dev/null
@@ -1,31 +0,0 @@
-/*
-    Copyright (c) 2007-2010 iMatix Corporation
-
-    This file is part of 0MQ.
-
-    0MQ is free software; you can redistribute it and/or modify it under
-    the terms of the Lesser GNU General Public License as published by
-    the Free Software Foundation; either version 3 of the License, or
-    (at your option) any later version.
-
-    0MQ is distributed in the hope that it will be useful,
-    but WITHOUT ANY WARRANTY; without even the implied warranty of
-    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    Lesser GNU General Public License for more details.
-
-    You should have received a copy of the Lesser GNU General Public License
-    along with this program.  If not, see <http://www.gnu.org/licenses/>.
-*/
-
-#ifndef __ZMQ_QUEUE_HPP_INCLUDED__
-#define __ZMQ_QUEUE_HPP_INCLUDED__
-
-namespace zmq
-{
-
-    int queue (class socket_base_t *insocket_,
-        class socket_base_t *outsocket_);
-
-}
-
-#endif
diff --git a/src/reaper.cpp b/src/reaper.cpp
new file mode 100644
index 0000000..d3ebbba
--- /dev/null
+++ b/src/reaper.cpp
@@ -0,0 +1,121 @@
+/*
+    Copyright (c) 2007-2011 iMatix Corporation
+    Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
+
+    This file is part of 0MQ.
+
+    0MQ is free software; you can redistribute it and/or modify it under
+    the terms of the GNU Lesser General Public License as published by
+    the Free Software Foundation; either version 3 of the License, or
+    (at your option) any later version.
+
+    0MQ is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU Lesser General Public License for more details.
+
+    You should have received a copy of the GNU Lesser General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "reaper.hpp"
+#include "socket_base.hpp"
+#include "err.hpp"
+
+zmq::reaper_t::reaper_t (class ctx_t *ctx_, uint32_t tid_) :
+    object_t (ctx_, tid_),
+    sockets (0),
+    terminating (false)
+{
+    poller = new (std::nothrow) poller_t;
+    alloc_assert (poller);
+
+    mailbox_handle = poller->add_fd (mailbox.get_fd (), this);
+    poller->set_pollin (mailbox_handle);
+}
+
+zmq::reaper_t::~reaper_t ()
+{
+    delete poller;
+}
+
+zmq::mailbox_t *zmq::reaper_t::get_mailbox ()
+{
+    return &mailbox;
+}
+
+void zmq::reaper_t::start ()
+{
+    //  Start the thread.
+    poller->start ();
+}
+
+void zmq::reaper_t::stop ()
+{
+    send_stop ();
+}
+
+void zmq::reaper_t::in_event ()
+{
+    while (true) {
+
+        //  Get the next command. If there is none, exit.
+        command_t cmd;
+        int rc = mailbox.recv (&cmd, false);
+        if (rc != 0 && errno == EINTR)
+            continue;
+        if (rc != 0 && errno == EAGAIN)
+            break;
+        errno_assert (rc == 0);
+
+        //  Process the command.
+        cmd.destination->process_command (cmd);
+    }
+}
+
+void zmq::reaper_t::out_event ()
+{
+    zmq_assert (false);
+}
+
+void zmq::reaper_t::timer_event (int id_)
+{
+    zmq_assert (false);
+}
+
+void zmq::reaper_t::process_stop ()
+{
+    terminating = true;
+
+    //  If there are no sockets beig reaped finish immediately.
+    if (!sockets) {
+        send_done ();
+        poller->rm_fd (mailbox_handle);
+        poller->stop ();
+    }
+}
+
+void zmq::reaper_t::process_reap (socket_base_t *socket_)
+{
+    //  Add the socket to the poller.
+    socket_->start_reaping (poller);
+
+    //  Start termination of associated I/O object hierarchy.
+    socket_->terminate ();
+    socket_->check_destroy ();
+
+    ++sockets;
+}
+
+void zmq::reaper_t::process_reaped ()
+{
+    --sockets;
+
+    //  If reaped was already asked to terminate and there are no more sockets,
+    //  finish immediately.
+    if (!sockets && terminating) {
+        send_done ();
+        poller->rm_fd (mailbox_handle);
+        poller->stop ();
+    }
+}
diff --git a/src/reaper.hpp b/src/reaper.hpp
new file mode 100644
index 0000000..edcc319
--- /dev/null
+++ b/src/reaper.hpp
@@ -0,0 +1,77 @@
+/*
+    Copyright (c) 2007-2011 iMatix Corporation
+    Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
+
+    This file is part of 0MQ.
+
+    0MQ is free software; you can redistribute it and/or modify it under
+    the terms of the GNU Lesser General Public License as published by
+    the Free Software Foundation; either version 3 of the License, or
+    (at your option) any later version.
+
+    0MQ is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU Lesser General Public License for more details.
+
+    You should have received a copy of the GNU Lesser General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef __ZMQ_REAPER_HPP_INCLUDED__
+#define __ZMQ_REAPER_HPP_INCLUDED__
+
+#include "object.hpp"
+#include "mailbox.hpp"
+#include "poller.hpp"
+#include "i_poll_events.hpp"
+
+namespace zmq
+{
+
+    class reaper_t : public object_t, public i_poll_events
+    {
+    public:
+
+        reaper_t (class ctx_t *ctx_, uint32_t tid_);
+        ~reaper_t ();
+
+        mailbox_t *get_mailbox ();
+
+        void start ();
+        void stop ();
+
+        //  i_poll_events implementation.
+        void in_event ();
+        void out_event ();
+        void timer_event (int id_);
+
+    private:
+
+        //  Command handlers.
+        void process_stop ();
+        void process_reap (class socket_base_t *socket_);
+        void process_reaped ();
+
+        //  Reaper thread accesses incoming commands via this mailbox.
+        mailbox_t mailbox;
+
+        //  Handle associated with mailbox' file descriptor.
+        poller_t::handle_t mailbox_handle;
+
+        //  I/O multiplexing is performed using a poller object.
+        poller_t *poller;
+
+        //  Number of sockets being reaped at the moment.
+        int sockets;
+
+        //  If true, we were already asked to terminate.
+        bool terminating;
+
+        reaper_t (const reaper_t&);
+        const reaper_t &operator = (const reaper_t&);
+    };
+
+}
+
+#endif
diff --git a/src/rep.cpp b/src/rep.cpp
index 34b77c4..46c35cb 100644
--- a/src/rep.cpp
+++ b/src/rep.cpp
@@ -1,19 +1,20 @@
 /*
-    Copyright (c) 2007-2010 iMatix Corporation
+    Copyright (c) 2007-2011 iMatix Corporation
+    Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
 
     This file is part of 0MQ.
 
     0MQ is free software; you can redistribute it and/or modify it under
-    the terms of the Lesser GNU General Public License as published by
+    the terms of the GNU Lesser General Public License as published by
     the Free Software Foundation; either version 3 of the License, or
     (at your option) any later version.
 
     0MQ is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    Lesser GNU General Public License for more details.
+    GNU Lesser General Public License for more details.
 
-    You should have received a copy of the Lesser GNU General Public License
+    You should have received a copy of the GNU Lesser General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
@@ -21,160 +22,37 @@
 
 #include "rep.hpp"
 #include "err.hpp"
-#include "pipe.hpp"
 
-zmq::rep_t::rep_t (class app_thread_t *parent_) :
-    socket_base_t (parent_),
-    active (0),
-    current (0),
+zmq::rep_t::rep_t (class ctx_t *parent_, uint32_t tid_) :
+    xrep_t (parent_, tid_),
     sending_reply (false),
-    more (false),
-    reply_pipe (NULL)
+    request_begins (true)
 {
-    options.requires_in = true;
-    options.requires_out = true;
-
-    //  We don't need immediate connect. We'll be able to send messages
-    //  (replies) only when connection is established and thus requests
-    //  can arrive anyway.
-    options.immediate_connect = false;
+    options.type = ZMQ_REP;
 }
 
 zmq::rep_t::~rep_t ()
 {
 }
 
-void zmq::rep_t::xattach_pipes (class reader_t *inpipe_,
-    class writer_t *outpipe_, const blob_t &peer_identity_)
-{
-    zmq_assert (inpipe_ && outpipe_);
-    zmq_assert (in_pipes.size () == out_pipes.size ());
-
-    in_pipes.push_back (inpipe_);
-    in_pipes.swap (active, in_pipes.size () - 1);
-    out_pipes.push_back (outpipe_);
-    out_pipes.swap (active, out_pipes.size () - 1);
-    active++;
-}
-
-void zmq::rep_t::xdetach_inpipe (class reader_t *pipe_)
-{
-    zmq_assert (sending_reply || !more || in_pipes [current] != pipe_);
-
-    zmq_assert (pipe_);
-    zmq_assert (in_pipes.size () == out_pipes.size ());
-
-    in_pipes_t::size_type index = in_pipes.index (pipe_);
-
-    if (index < active) {
-        active--;
-        if (current == active)
-            current = 0;
-    }
-
-    if (out_pipes [index])
-        out_pipes [index]->term ();
-    in_pipes.erase (index);
-    out_pipes.erase (index);
-}
-
-void zmq::rep_t::xdetach_outpipe (class writer_t *pipe_)
-{
-    zmq_assert (pipe_);
-    zmq_assert (in_pipes.size () == out_pipes.size ());
-
-    out_pipes_t::size_type index = out_pipes.index (pipe_);
-
-    //  If the connection we've got the request from disconnects,
-    //  there's nowhere to send the reply. Forget about the reply pipe.
-    //  Once the reply is sent it will be dropped.
-    if (sending_reply && pipe_ == reply_pipe)
-        reply_pipe = NULL;
-
-    if (out_pipes.index (pipe_) < active) {
-        active--;
-        if (current == active)
-            current = 0;
-    }
-
-    if (in_pipes [index])
-        in_pipes [index]->term ();
-    in_pipes.erase (index);
-    out_pipes.erase (index);
-}
-
-void zmq::rep_t::xkill (class reader_t *pipe_)
-{
-    //  Move the pipe to the list of inactive pipes.
-    in_pipes_t::size_type index = in_pipes.index (pipe_);
-    active--;
-    in_pipes.swap (index, active);
-    out_pipes.swap (index, active);
-}
-
-void zmq::rep_t::xrevive (class reader_t *pipe_)
-{
-    //  Move the pipe to the list of active pipes.
-    in_pipes_t::size_type index = in_pipes.index (pipe_);
-    in_pipes.swap (index, active);
-    out_pipes.swap (index, active);
-    active++;
-}
-
-void zmq::rep_t::xrevive (class writer_t *pipe_)
-{
-}
-
-int zmq::rep_t::xsetsockopt (int option_, const void *optval_,
-    size_t optvallen_)
-{
-    errno = EINVAL;
-    return -1;
-}
-
 int zmq::rep_t::xsend (zmq_msg_t *msg_, int flags_)
 {
+    //  If we are in the middle of receiving a request, we cannot send reply.
     if (!sending_reply) {
         errno = EFSM;
         return -1;
     }
 
-    if (reply_pipe) {
+    bool more = (msg_->flags & ZMQ_MSG_MORE);
 
-        // Push message to the reply pipe.
-        bool written = reply_pipe->write (msg_);
-        zmq_assert (!more || written);
+    //  Push message to the reply pipe.
+    int rc = xrep_t::xsend (msg_, flags_);
+    if (rc != 0)
+        return rc;
 
-        // The pipe is full...
-        // When this happens, we simply return an error.
-        // This makes REP sockets vulnerable to DoS attack when
-        // misbehaving requesters stop collecting replies.
-        // TODO: Tear down the underlying connection (?)
-        if (!written) {
-            errno = EAGAIN;
-            return -1;
-        }
-
-        more = msg_->flags & ZMQ_MSG_MORE;
-    }
-    else {
-
-        // If the requester have disconnected in the meantime, drop the reply.
-        more = msg_->flags & ZMQ_MSG_MORE;
-        zmq_msg_close (msg_);
-    }
-
-    // Flush the reply to the requester.
-    if (!more) {
-        if (reply_pipe)
-            reply_pipe->flush ();
+    //  If the reply is complete flip the FSM back to request receiving state.
+    if (!more)
         sending_reply = false;
-        reply_pipe = NULL;
-    }
-
-    // Detach the message from the data buffer.
-    int rc = zmq_msg_init (msg_);
-    zmq_assert (rc == 0);
 
     return 0;
 }
@@ -187,63 +65,44 @@ int zmq::rep_t::xrecv (zmq_msg_t *msg_, int flags_)
         return -1;
     }
 
-    //  Deallocate old content of the message.
-    zmq_msg_close (msg_);
-
-    //  We haven't started reading a request yet...
-    if (!more) {
+    if (request_begins) {
 
-        //  Round-robin over the pipes to get next message.
-        int count;
-        for (count = active; count != 0; count--) {
-            if (in_pipes [current]->read (msg_))
-                break;
-            current++;
-            if (current >= active)
-                current = 0;
-        }
+        //  Copy the backtrace stack to the reply pipe.
+        bool bottom = false;
+        while (!bottom) {
 
-        //  No message is available. Initialise the output parameter
-        //  to be a 0-byte message.
-        if (count == 0) {
-            zmq_msg_init (msg_);
-            errno = EAGAIN;
-            return -1;
-        }
+            //  TODO: What if request can be read but reply pipe is not
+            //  ready for writing?
 
-        //  We are aware of a new message now. Setup the reply pipe.
-        reply_pipe = out_pipes [current];
+            //  Get next part of the backtrace stack.
+            int rc = xrep_t::xrecv (msg_, flags_);
+            if (rc != 0)
+                return rc;
+            zmq_assert (msg_->flags & ZMQ_MSG_MORE);
 
-        //  Copy the routing info to the reply pipe.
-        while (true) {
+            //  Empty message part delimits the traceback stack.
+            bottom = (zmq_msg_size (msg_) == 0);
 
-            //  Push message to the reply pipe.
-            //  TODO: What if the pipe is full?
-            //  Tear down the underlying connection?
-            bool written = reply_pipe->write (msg_);
-            zmq_assert (written);
-
-            //  Message part of zero size delimits the traceback stack.
-            if (zmq_msg_size (msg_) == 0)
-                break;
-
-            //  Get next part of the message.
-            bool fetched = in_pipes [current]->read (msg_);
-            zmq_assert (fetched);
+            //  Push it to the reply pipe.
+            rc = xrep_t::xsend (msg_, flags_);
+            zmq_assert (rc == 0);
         }
+
+        request_begins = false;
     }
 
-    //  Now the routing info is processed. Get the first part
+    //  Now the routing info is safely stored. Get the first part
     //  of the message payload and exit.
-    bool fetched = in_pipes [current]->read (msg_);
-    zmq_assert (fetched);
-    more = msg_->flags & ZMQ_MSG_MORE;
-    if (!more) {
-        current++;
-        if (current >= active)
-            current = 0;
+    int rc = xrep_t::xrecv (msg_, flags_);
+    if (rc != 0)
+        return rc;
+
+    //  If whole request is read, flip the FSM to reply-sending state.
+    if (!(msg_->flags & ZMQ_MSG_MORE)) {
         sending_reply = true;
+        request_begins = true;
     }
+
     return 0;
 }
 
@@ -252,18 +111,7 @@ bool zmq::rep_t::xhas_in ()
     if (sending_reply)
         return false;
 
-    if (more)
-        return true;
-
-    for (int count = active; count != 0; count--) {
-        if (in_pipes [current]->check_read ())
-            return !sending_reply;
-        current++;
-        if (current >= active)
-            current = 0;
-    }
-
-    return false;
+    return xrep_t::xhas_in ();
 }
 
 bool zmq::rep_t::xhas_out ()
@@ -271,10 +119,6 @@ bool zmq::rep_t::xhas_out ()
     if (!sending_reply)
         return false;
 
-    if (more)
-        return true;
-
-    //  TODO: No check for write here...
-    return sending_reply;
+    return xrep_t::xhas_out ();
 }
 
diff --git a/src/rep.hpp b/src/rep.hpp
index aef4318..d0dd9c8 100644
--- a/src/rep.hpp
+++ b/src/rep.hpp
@@ -1,47 +1,39 @@
 /*
-    Copyright (c) 2007-2010 iMatix Corporation
+    Copyright (c) 2007-2011 iMatix Corporation
+    Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
 
     This file is part of 0MQ.
 
     0MQ is free software; you can redistribute it and/or modify it under
-    the terms of the Lesser GNU General Public License as published by
+    the terms of the GNU Lesser General Public License as published by
     the Free Software Foundation; either version 3 of the License, or
     (at your option) any later version.
 
     0MQ is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    Lesser GNU General Public License for more details.
+    GNU Lesser General Public License for more details.
 
-    You should have received a copy of the Lesser GNU General Public License
+    You should have received a copy of the GNU Lesser General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
 #ifndef __ZMQ_REP_HPP_INCLUDED__
 #define __ZMQ_REP_HPP_INCLUDED__
 
-#include "socket_base.hpp"
-#include "yarray.hpp"
+#include "xrep.hpp"
 
 namespace zmq
 {
 
-    class rep_t : public socket_base_t
+    class rep_t : public xrep_t
     {
     public:
 
-        rep_t (class app_thread_t *parent_);
+        rep_t (class ctx_t *parent_, uint32_t tid_);
         ~rep_t ();
 
         //  Overloads of functions from socket_base_t.
-        void xattach_pipes (class reader_t *inpipe_, class writer_t *outpipe_,
-            const blob_t &peer_identity_);
-        void xdetach_inpipe (class reader_t *pipe_);
-        void xdetach_outpipe (class writer_t *pipe_);
-        void xkill (class reader_t *pipe_);
-        void xrevive (class reader_t *pipe_);
-        void xrevive (class writer_t *pipe_);
-        int xsetsockopt (int option_, const void *optval_, size_t optvallen_);
         int xsend (zmq_msg_t *msg_, int flags_);
         int xrecv (zmq_msg_t *msg_, int flags_);
         bool xhas_in ();
@@ -49,34 +41,16 @@ namespace zmq
 
     private:
 
-        //  List in outbound and inbound pipes. Note that the two lists are
-        //  always in sync. I.e. outpipe with index N communicates with the
-        //  same session as inpipe with index N.
-        typedef yarray_t <class writer_t> out_pipes_t;
-        out_pipes_t out_pipes;
-        typedef yarray_t <class reader_t> in_pipes_t;
-        in_pipes_t in_pipes;
-
-        //  Number of active inpipes. All the active inpipes are located at the
-        //  beginning of the in_pipes array.
-        in_pipes_t::size_type active;
-
-        //  Index of the next inbound pipe to read a request from.
-        in_pipes_t::size_type current;
-
-        //  If true, request was already received and reply wasn't completely
-        //  sent yet.
+        //  If true, we are in process of sending the reply. If false we are
+        //  in process of receiving a request.
         bool sending_reply;
 
-        //  True, if message processed at the moment (either sent or received)
-        //  is processed only partially.
-        bool more;
-
-        //  Pipe we are going to send reply to.
-        class writer_t *reply_pipe;
+        //  If true, we are starting to receive a request. The beginning
+        //  of the request is the backtrace stack.
+        bool request_begins;
 
         rep_t (const rep_t&);
-        void operator = (const rep_t&);
+        const rep_t &operator = (const rep_t&);
 
     };
 
diff --git a/src/req.cpp b/src/req.cpp
index a77c061..f495492 100644
--- a/src/req.cpp
+++ b/src/req.cpp
@@ -1,19 +1,20 @@
 /*
-    Copyright (c) 2007-2010 iMatix Corporation
+    Copyright (c) 2007-2011 iMatix Corporation
+    Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
 
     This file is part of 0MQ.
 
     0MQ is free software; you can redistribute it and/or modify it under
-    the terms of the Lesser GNU General Public License as published by
+    the terms of the GNU Lesser General Public License as published by
     the Free Software Foundation; either version 3 of the License, or
     (at your option) any later version.
 
     0MQ is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    Lesser GNU General Public License for more details.
+    GNU Lesser General Public License for more details.
 
-    You should have received a copy of the Lesser GNU General Public License
+    You should have received a copy of the GNU Lesser General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
@@ -21,119 +22,19 @@
 
 #include "req.hpp"
 #include "err.hpp"
-#include "pipe.hpp"
 
-zmq::req_t::req_t (class app_thread_t *parent_) :
-    socket_base_t (parent_),
-    active (0),
-    current (0),
+zmq::req_t::req_t (class ctx_t *parent_, uint32_t tid_) :
+    xreq_t (parent_, tid_),
     receiving_reply (false),
-    reply_pipe_active (false),
-    more (false),
-    reply_pipe (NULL)
+    message_begins (true)
 {
-    options.requires_in = true;
-    options.requires_out = true;
+    options.type = ZMQ_REQ;
 }
 
 zmq::req_t::~req_t ()
 {
 }
 
-void zmq::req_t::xattach_pipes (class reader_t *inpipe_,
-    class writer_t *outpipe_, const blob_t &peer_identity_)
-{
-    zmq_assert (inpipe_ && outpipe_);
-    zmq_assert (in_pipes.size () == out_pipes.size ());
-
-    in_pipes.push_back (inpipe_);
-    in_pipes.swap (active, in_pipes.size () - 1);
-
-    out_pipes.push_back (outpipe_);
-    out_pipes.swap (active, out_pipes.size () - 1);
-
-    active++;
-}
-
-void zmq::req_t::xdetach_inpipe (class reader_t *pipe_)
-{
-    zmq_assert (!receiving_reply || !more || reply_pipe != pipe_);
-
-    zmq_assert (pipe_);
-    zmq_assert (in_pipes.size () == out_pipes.size ());
-
-    //  TODO: The pipe we are awaiting the reply from is detached. What now?
-    //  Return ECONNRESET from subsequent recv?
-    if (receiving_reply && pipe_ == reply_pipe) {
-        zmq_assert (false);
-    }
-
-    in_pipes_t::size_type index = in_pipes.index (pipe_);
-
-    if (out_pipes [index])
-        out_pipes [index]->term ();
-    in_pipes.erase (index);
-    out_pipes.erase (index);
-    if (index < active) {
-        active--;
-        if (current == active)
-            current = 0;
-    }
-}
-
-void zmq::req_t::xdetach_outpipe (class writer_t *pipe_)
-{
-    zmq_assert (receiving_reply || !more || out_pipes [current] != pipe_);
-
-    zmq_assert (pipe_);
-    zmq_assert (in_pipes.size () == out_pipes.size ());
-
-    out_pipes_t::size_type index = out_pipes.index (pipe_);
-
-    if (in_pipes [index])
-        in_pipes [index]->term ();
-    in_pipes.erase (index);
-    out_pipes.erase (index);
-    if (index < active) {
-        active--;
-        if (current == active)
-            current = 0;
-    }
-}
-
-void zmq::req_t::xkill (class reader_t *pipe_)
-{
-    zmq_assert (receiving_reply);
-    zmq_assert (pipe_ == reply_pipe);
-
-    reply_pipe_active = false;
-}
-
-void zmq::req_t::xrevive (class reader_t *pipe_)
-{
-    if (pipe_ == reply_pipe)
-        reply_pipe_active = true;
-}
-
-void zmq::req_t::xrevive (class writer_t *pipe_)
-{
-    out_pipes_t::size_type index = out_pipes.index (pipe_);
-    zmq_assert (index >= active);
-
-    if (in_pipes [index] != NULL) {
-        in_pipes.swap (index, active);
-        out_pipes.swap (index, active);
-        active++;
-    }
-}
-
-int zmq::req_t::xsetsockopt (int option_, const void *optval_,
-    size_t optvallen_)
-{
-    errno = EINVAL;
-    return -1;
-}
-
 int zmq::req_t::xsend (zmq_msg_t *msg_, int flags_)
 {
     //  If we've sent a request and we still haven't got the reply,
@@ -143,98 +44,59 @@ int zmq::req_t::xsend (zmq_msg_t *msg_, int flags_)
         return -1;
     }
 
-    while (active > 0) {
-        if (out_pipes [current]->check_write ())
-            break;
-
-        zmq_assert (!more);
-        active--;
-        if (current < active) {
-            in_pipes.swap (current, active);
-            out_pipes.swap (current, active);
-        }
-        else
-            current = 0;
-    }
-
-    if (active == 0) {
-        errno = EAGAIN;
-        return -1;
-    }
-
-    //  If we are starting to send the request, generate a prefix.
-    if (!more) {
+    //  First part of the request is empty message part (stack bottom).
+    if (message_begins) {
         zmq_msg_t prefix;
         int rc = zmq_msg_init (&prefix);
         zmq_assert (rc == 0);
-        prefix.flags |= ZMQ_MSG_MORE;
-        bool written = out_pipes [current]->write (&prefix);
-        zmq_assert (written);
+        prefix.flags = ZMQ_MSG_MORE;
+        rc = xreq_t::xsend (&prefix, flags_);
+        if (rc != 0)
+            return rc;
+        message_begins = false;
     }
 
-    //  Push the message to the selected pipe.
-    bool written = out_pipes [current]->write (msg_);
-    zmq_assert (written);
-    more = msg_->flags & ZMQ_MSG_MORE;
-    if (!more) {
-        out_pipes [current]->flush ();
-        receiving_reply = true;
-        reply_pipe = in_pipes [current];
+    bool more = msg_->flags & ZMQ_MSG_MORE;
 
-        //  We can safely assume that the reply pipe is active as the last time
-        //  we've used it we've read the reply and haven't tried to read from it
-        //  anymore.
-        reply_pipe_active = true;
+    int rc = xreq_t::xsend (msg_, flags_);
+    if (rc != 0)
+        return rc;
 
-        //  Move to the next pipe (load-balancing).
-        current = (current + 1) % active;
+    //  If the request was fully sent, flip the FSM into reply-receiving state.
+    if (!more) {
+        receiving_reply = true;
+        message_begins = true;
     }
 
-    //  Detach the message from the data buffer.
-    int rc = zmq_msg_init (msg_);
-    zmq_assert (rc == 0);
-
     return 0;
 }
 
 int zmq::req_t::xrecv (zmq_msg_t *msg_, int flags_)
 {
-    //  Deallocate old content of the message.
-    int rc = zmq_msg_close (msg_);
-    zmq_assert (rc == 0);
-
     //  If request wasn't send, we can't wait for reply.
     if (!receiving_reply) {
-        zmq_msg_init (msg_);
         errno = EFSM;
         return -1;
     }
 
-    //  Get the reply from the reply pipe.
-    if (!reply_pipe_active || !reply_pipe->read (msg_)) {
-        zmq_msg_init (msg_);
-        errno = EAGAIN;
-        return -1;
-    }
-
-    //  If we are starting to receive new reply, check whether prefix
-    //  is well-formed and drop it.
-    if (!more) {
+    //  First part of the reply should be empty message part (stack bottom).
+    if (message_begins) {
+        int rc = xreq_t::xrecv (msg_, flags_);
+        if (rc != 0)
+            return rc;
         zmq_assert (msg_->flags & ZMQ_MSG_MORE);
         zmq_assert (zmq_msg_size (msg_) == 0);
-        rc = zmq_msg_close (msg_);
-        zmq_assert (rc == 0);
-
-        //  Get the actual reply.
-        bool recvd = reply_pipe->read (msg_);
-        zmq_assert (recvd);
+        message_begins = false;
     }
 
-    //  If this was last part of the reply, switch to request phase.
-    more = msg_->flags & ZMQ_MSG_MORE;
-    if (!more) {
+    int rc = xreq_t::xrecv (msg_, flags_);
+    if (rc != 0)
+        return rc;
+
+    //  If the reply is fully received, flip the FSM into request-sending state.
+    if (!(msg_->flags & ZMQ_MSG_MORE)) {
         receiving_reply = false;
-        reply_pipe = NULL;
+        message_begins = true;
     }
 
     return 0;
@@ -242,43 +104,18 @@ int zmq::req_t::xrecv (zmq_msg_t *msg_, int flags_)
 
 bool zmq::req_t::xhas_in ()
 {
-    if (receiving_reply && more)
-        return true;
-
-    if (!receiving_reply || !reply_pipe_active)
-        return false;
-
-    zmq_assert (reply_pipe);    
-    if (!reply_pipe->check_read ()) {
-        reply_pipe_active = false;
+    if (!receiving_reply)
         return false;
-    }
 
-    return true;
+    return xreq_t::xhas_in ();
 }
 
 bool zmq::req_t::xhas_out ()
 {
-    if (!receiving_reply && more)
-        return true;
-
     if (receiving_reply)
         return false;
 
-    while (active > 0) {
-        if (out_pipes [current]->check_write ())
-            return true;;
-
-        active--;
-        if (current < active) {
-            in_pipes.swap (current, active);
-            out_pipes.swap (current, active);
-        }
-        else
-            current = 0;
-    }
-
-    return false;
+    return xreq_t::xhas_out ();
 }
 
 
diff --git a/src/req.hpp b/src/req.hpp
index 5ab7bca..3138498 100644
--- a/src/req.hpp
+++ b/src/req.hpp
@@ -1,47 +1,39 @@
 /*
-    Copyright (c) 2007-2010 iMatix Corporation
+    Copyright (c) 2007-2011 iMatix Corporation
+    Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
 
     This file is part of 0MQ.
 
     0MQ is free software; you can redistribute it and/or modify it under
-    the terms of the Lesser GNU General Public License as published by
+    the terms of the GNU Lesser General Public License as published by
     the Free Software Foundation; either version 3 of the License, or
     (at your option) any later version.
 
     0MQ is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    Lesser GNU General Public License for more details.
+    GNU Lesser General Public License for more details.
 
-    You should have received a copy of the Lesser GNU General Public License
+    You should have received a copy of the GNU Lesser General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
 #ifndef __ZMQ_REQ_HPP_INCLUDED__
 #define __ZMQ_REQ_HPP_INCLUDED__
 
-#include "socket_base.hpp"
-#include "yarray.hpp"
+#include "xreq.hpp"
 
 namespace zmq
 {
 
-    class req_t : public socket_base_t
+    class req_t : public xreq_t
     {
     public:
 
-        req_t (class app_thread_t *parent_);
+        req_t (class ctx_t *parent_, uint32_t tid_);
         ~req_t ();
 
         //  Overloads of functions from socket_base_t.
-        void xattach_pipes (class reader_t *inpipe_, class writer_t *outpipe_,
-            const blob_t &peer_identity_);
-        void xdetach_inpipe (class reader_t *pipe_);
-        void xdetach_outpipe (class writer_t *pipe_);
-        void xkill (class reader_t *pipe_);
-        void xrevive (class reader_t *pipe_);
-        void xrevive (class writer_t *pipe_);
-        int xsetsockopt (int option_, const void *optval_, size_t optvallen_);
         int xsend (zmq_msg_t *msg_, int flags_);
         int xrecv (zmq_msg_t *msg_, int flags_);
         bool xhas_in ();
@@ -49,43 +41,16 @@ namespace zmq
 
     private:
 
-        //  List in outbound and inbound pipes. Note that the two lists are
-        //  always in sync. I.e. outpipe with index N communicates with the
-        //  same session as inpipe with index N.
-        //
-        //  TODO: Once we have queue limits in place, list of active outpipes
-        //  is to be held (presumably by stacking active outpipes at
-        //  the beginning of the array). We don't have to do the same thing for
-        //  inpipes, because we know which pipe we want to read the
-        //  reply from.
-        typedef yarray_t <class writer_t> out_pipes_t;
-        out_pipes_t out_pipes;
-        typedef yarray_t <class reader_t> in_pipes_t;
-        in_pipes_t in_pipes;
-
-        //  Number of active pipes.
-        size_t active;
-
-        //  Req_t load-balances the requests - 'current' points to the session
-        //  that's processing the request at the moment.
-        out_pipes_t::size_type current;
-
         //  If true, request was already sent and reply wasn't received yet or
         //  was raceived partially.
         bool receiving_reply;
 
-        //  True, if read can be attempted from the reply pipe.
-        bool reply_pipe_active;
-
-        //  True, if message processed at the moment (either sent or received)
-        //  is processed only partially.
-        bool more;
-
-        //  Pipe we are awaiting the reply from.
-        class reader_t *reply_pipe;
+        //  If true, we are starting to send/recv a message. The first part
+        //  of the message must be empty message part (backtrace stack bottom).
+        bool message_begins;
 
         req_t (const req_t&);
-        void operator = (const req_t&);
+        const req_t &operator = (const req_t&);
     };
 
 }
diff --git a/src/select.cpp b/src/select.cpp
index 59eb83e..56f9f74 100644
--- a/src/select.cpp
+++ b/src/select.cpp
@@ -1,19 +1,20 @@
 /*
-    Copyright (c) 2007-2010 iMatix Corporation
+    Copyright (c) 2007-2011 iMatix Corporation
+    Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
 
     This file is part of 0MQ.
 
     0MQ is free software; you can redistribute it and/or modify it under
-    the terms of the Lesser GNU General Public License as published by
+    the terms of the GNU Lesser General Public License as published by
     the Free Software Foundation; either version 3 of the License, or
     (at your option) any later version.
 
     0MQ is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    Lesser GNU General Public License for more details.
+    GNU Lesser General Public License for more details.
 
-    You should have received a copy of the Lesser GNU General Public License
+    You should have received a copy of the GNU Lesser General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
@@ -54,9 +55,6 @@ zmq::select_t::select_t () :
 zmq::select_t::~select_t ()
 {
     worker.stop ();
-
-    //  Make sure there are no fds registered on shutdown.
-    zmq_assert (load.get () == 0);
 }
 
 zmq::select_t::handle_t zmq::select_t::add_fd (fd_t fd_, i_poll_events *events_)
@@ -77,7 +75,7 @@ zmq::select_t::handle_t zmq::select_t::add_fd (fd_t fd_, i_poll_events *events_)
         maxfd = fd_;
 
     //  Increase the load metric of the thread.
-    load.add (1);
+    adjust_load (1);
 
     return fd_;
 }
@@ -86,7 +84,7 @@ void zmq::select_t::rm_fd (handle_t handle_)
 {
     //  Mark the descriptor as retired.
     fd_set_t::iterator it;
-    for (it = fds.begin (); it != fds.end (); it ++)
+    for (it = fds.begin (); it != fds.end (); ++it)
         if (it->fd == handle_)
             break;
     zmq_assert (it != fds.end ());
@@ -107,13 +105,13 @@ void zmq::select_t::rm_fd (handle_t handle_)
     //  highest-numbered file descriptor.
     if (handle_ == maxfd) {
         maxfd = retired_fd;
-        for (fd_set_t::iterator it = fds.begin (); it != fds.end (); it ++)
+        for (fd_set_t::iterator it = fds.begin (); it != fds.end (); ++it)
             if (it->fd > maxfd)
                 maxfd = it->fd;
     }
 
     //  Decrease the load metric of the thread.
-    load.sub (1);
+    adjust_load (-1);
 }
 
 void zmq::select_t::set_pollin (handle_t handle_)
@@ -136,23 +134,6 @@ void zmq::select_t::reset_pollout (handle_t handle_)
     FD_CLR (handle_, &source_set_out);
 }
 
-void zmq::select_t::add_timer (i_poll_events *events_)
-{
-    timers.push_back (events_);
-}
-
-void zmq::select_t::cancel_timer (i_poll_events *events_)
-{
-    timers_t::iterator it = std::find (timers.begin (), timers.end (), events_);
-    if (it != timers.end ())
-        timers.erase (it);
-}
-
-int zmq::select_t::get_load ()
-{
-    return load.get ();
-}
-
 void zmq::select_t::start ()
 {
     worker.start (worker_routine, this);
@@ -167,19 +148,19 @@ void zmq::select_t::loop ()
 {
     while (!stopping) {
 
+        //  Execute any due timers.
+        int timeout = (int) execute_timers ();
+
         //  Intialise the pollsets.
         memcpy (&readfds, &source_set_in, sizeof source_set_in);
         memcpy (&writefds, &source_set_out, sizeof source_set_out);
         memcpy (&exceptfds, &source_set_err, sizeof source_set_err);
 
-        //  Compute the timout interval. Select is free to overwrite the
-        //  value so we have to compute it each time anew.
-        timeval timeout = {max_timer_period / 1000,
-            (max_timer_period % 1000) * 1000};
-
         //  Wait for events.
+        struct timeval tv = {(long) (timeout / 1000),
+            (long) (timeout % 1000 * 1000)};
         int rc = select (maxfd + 1, &readfds, &writefds, &exceptfds,
-            timers.empty () ? NULL : &timeout);
+            timeout ? &tv : NULL);
 
 #ifdef ZMQ_HAVE_WINDOWS
         wsa_assert (rc != SOCKET_ERROR);
@@ -189,20 +170,10 @@ void zmq::select_t::loop ()
         errno_assert (rc != -1);
 #endif
 
-        //  Handle timer.
-        if (!rc) {
-
-            //  Use local list of timers as timer handlers may fill new timers
-            //  into the original array.
-            timers_t t;
-            std::swap (timers, t);
-
-            //  Trigger all the timers.
-            for (timers_t::iterator it = t.begin (); it != t.end (); it ++)
-                (*it)->timer_event ();
-
+        //  If there are no events (i.e. it's a timeout) there's no point
+        //  in checking the pollset.
+        if (rc == 0)
             continue;
-        }
 
         for (fd_set_t::size_type i = 0; i < fds.size (); i ++) {
             if (fds [i].fd == retired_fd)
@@ -221,15 +192,8 @@ void zmq::select_t::loop ()
 
         //  Destroy retired event sources.
         if (retired) {
-            fd_set_t::iterator it = fds.begin();
-            while (it != fds.end()) {
-                if (it->fd == retired_fd) {
-                    it = fds.erase(it);
-                }
-                else {
-                    it++;
-                }
-            }
+            fds.erase (std::remove_if (fds.begin (), fds.end (),
+                zmq::select_t::is_retired_fd), fds.end ());
             retired = false;
         }
     }
@@ -239,3 +203,9 @@ void zmq::select_t::worker_routine (void *arg_)
 {
     ((select_t*) arg_)->loop ();
 }
+
+bool zmq::select_t::is_retired_fd (const fd_entry_t &entry)
+{
+    return (entry.fd == retired_fd);
+}
+
diff --git a/src/select.hpp b/src/select.hpp
index 01e9fa8..c88dd71 100644
--- a/src/select.hpp
+++ b/src/select.hpp
@@ -1,19 +1,20 @@
 /*
-    Copyright (c) 2007-2010 iMatix Corporation
+    Copyright (c) 2007-2011 iMatix Corporation
+    Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
 
     This file is part of 0MQ.
 
     0MQ is free software; you can redistribute it and/or modify it under
-    the terms of the Lesser GNU General Public License as published by
+    the terms of the GNU Lesser General Public License as published by
     the Free Software Foundation; either version 3 of the License, or
     (at your option) any later version.
 
     0MQ is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    Lesser GNU General Public License for more details.
+    GNU Lesser General Public License for more details.
 
-    You should have received a copy of the Lesser GNU General Public License
+    You should have received a copy of the GNU Lesser General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
@@ -36,7 +37,7 @@
 
 #include "fd.hpp"
 #include "thread.hpp"
-#include "atomic_counter.hpp"
+#include "poller_base.hpp"
 
 namespace zmq
 {
@@ -44,7 +45,7 @@ namespace zmq
     //  Implements socket polling mechanism using POSIX.1-2001 select()
     //  function.
 
-    class select_t
+    class select_t : public poller_base_t
     {
     public:
 
@@ -60,9 +61,6 @@ namespace zmq
         void reset_pollin (handle_t handle_);
         void set_pollout (handle_t handle_);
         void reset_pollout (handle_t handle_);
-        void add_timer (struct i_poll_events *events_);
-        void cancel_timer (struct i_poll_events *events_);
-        int get_load ();
         void start ();
         void stop ();
 
@@ -80,6 +78,9 @@ namespace zmq
             struct i_poll_events *events;
         };
 
+        //  Checks if an fd_entry_t is retired.
+        static bool is_retired_fd (const fd_entry_t &entry);
+
         //  Set of file descriptors that are used to retreive
         //  information for fd_set.
         typedef std::vector <fd_entry_t> fd_set_t;
@@ -99,22 +100,14 @@ namespace zmq
         //  If true, at least one file descriptor has retired.
         bool retired;
 
-        //  List of all the engines waiting for the timer event.
-        typedef std::vector <struct i_poll_events*> timers_t;
-        timers_t timers;
-
         //  If true, thread is shutting down.
         bool stopping;
 
         //  Handle of the physical thread doing the I/O work.
         thread_t worker;
 
-        //  Load of the poller. Currently number of file descriptors
-        //  registered with the poller.
-        atomic_counter_t load;
-
         select_t (const select_t&);
-        void operator = (const select_t&);
+        const select_t &operator = (const select_t&);
     };
 
 }
diff --git a/src/semaphore.hpp b/src/semaphore.hpp
new file mode 100644
index 0000000..edc0683
--- /dev/null
+++ b/src/semaphore.hpp
@@ -0,0 +1,189 @@
+/*
+    Copyright (c) 2007-2011 iMatix Corporation
+    Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
+
+    This file is part of 0MQ.
+
+    0MQ is free software; you can redistribute it and/or modify it under
+    the terms of the GNU Lesser General Public License as published by
+    the Free Software Foundation; either version 3 of the License, or
+    (at your option) any later version.
+
+    0MQ is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU Lesser General Public License for more details.
+
+    You should have received a copy of the GNU Lesser General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef __ZMQ_SEMAPHORE_HPP_INCLUDED__
+#define __ZMQ_SEMAPHORE_HPP_INCLUDED__
+
+#include "platform.hpp"
+#include "err.hpp"
+
+#if defined ZMQ_HAVE_WINDOWS
+#include "windows.hpp"
+#elif defined ZMQ_HAVE_OPENVMS
+#include <pthread.h>
+#else
+#include <semaphore.h>
+#endif
+
+namespace zmq
+{
+    //  Simple semaphore. Only single thread may be waiting at any given time.
+    //  Also, the semaphore may not be posted before the previous post
+    //  was matched by corresponding wait and the waiting thread was
+    //  released.
+
+#if defined ZMQ_HAVE_WINDOWS
+
+    //  On Windows platform simple semaphore is implemeted using event object.
+
+    class semaphore_t
+    { 
+    public:
+
+        //  Initialise the semaphore.
+        inline semaphore_t ()
+        {
+            ev = CreateEvent (NULL, FALSE, FALSE, NULL);
+            win_assert (ev != NULL);
+        }
+
+        //  Destroy the semaphore.
+        inline ~semaphore_t ()
+        {
+            int rc = CloseHandle (ev);
+            win_assert (rc != 0);    
+        }
+
+        //  Wait for the semaphore.
+        inline void wait ()
+        {
+            DWORD rc = WaitForSingleObject (ev, INFINITE);
+            win_assert (rc != WAIT_FAILED);
+        }
+
+        //  Post the semaphore.
+        inline void post ()
+        {
+            int rc = SetEvent (ev);
+            win_assert (rc != 0);
+        }
+
+    private:
+
+        HANDLE ev;
+
+        semaphore_t (const semaphore_t&);
+        const semaphore_t &operator = (const semaphore_t&);
+    };
+
+#elif defined ZMQ_HAVE_LINUX || defined ZMQ_HAVE_OSX || defined ZMQ_HAVE_OPENVMS
+
+    //  On platforms that allow for double locking of a mutex from the same
+    //  thread, simple semaphore is implemented using mutex, as it is more
+    //  efficient than full-blown semaphore.
+
+    //  Note that OS-level semaphore is not implemented on OSX, so the below
+    //  code is not only optimisation, it's necessary to make 0MQ work on OSX.
+
+    class semaphore_t
+    { 
+    public:
+
+        //  Initialise the semaphore.
+        inline semaphore_t ()
+        {
+            int rc = pthread_mutex_init (&mutex, NULL);
+            posix_assert (rc);
+            rc = pthread_mutex_lock (&mutex);
+            posix_assert (rc);
+        }
+
+        //  Destroy the semaphore.
+        inline ~semaphore_t ()
+        {
+            int rc = pthread_mutex_unlock (&mutex);
+            posix_assert (rc);
+            rc = pthread_mutex_destroy (&mutex);
+            posix_assert (rc);
+        }
+
+        //  Wait for the semaphore.
+        inline void wait ()
+        {
+             int rc = pthread_mutex_lock (&mutex);
+             posix_assert (rc);
+        }
+
+        //  Post the semaphore.
+        inline void post ()
+        {
+            int rc = pthread_mutex_unlock (&mutex);
+            posix_assert (rc);
+        }
+
+    private:
+
+        pthread_mutex_t mutex;
+
+        semaphore_t (const semaphore_t&);
+        const semaphore_t &operator = (const semaphore_t&);
+    };
+
+#else
+
+    //  Default implementation maps simple semaphore to POSIX semaphore.
+
+    class semaphore_t
+    { 
+    public:
+
+        //  Initialise the semaphore.
+        inline semaphore_t ()
+        {
+             int rc = sem_init (&sem, 0, 0);
+             errno_assert (rc != -1);
+        }
+
+        //  Destroy the semaphore.
+        inline ~semaphore_t ()
+        {
+             int rc = sem_destroy (&sem);
+             errno_assert (rc != -1);
+        }
+
+        //  Wait for the semaphore.
+        inline void wait ()
+        {
+             int rc = sem_wait (&sem);
+             errno_assert (rc != -1);
+        }
+
+        //  Post the semaphore.
+        inline void post ()
+        {
+            int rc = sem_post (&sem);
+            errno_assert (rc != -1);
+        }
+
+    private:
+
+        //  Underlying system semaphore object.
+        sem_t sem;
+
+        semaphore_t (const semaphore_t&);
+        const semaphore_t &operator = (const semaphore_t&);
+    };
+
+#endif
+
+}
+
+#endif
+
diff --git a/src/session.cpp b/src/session.cpp
index f798877..33c25d9 100644
--- a/src/session.cpp
+++ b/src/session.cpp
@@ -1,77 +1,88 @@
 /*
-    Copyright (c) 2007-2010 iMatix Corporation
+    Copyright (c) 2007-2011 iMatix Corporation
+    Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
 
     This file is part of 0MQ.
 
     0MQ is free software; you can redistribute it and/or modify it under
-    the terms of the Lesser GNU General Public License as published by
+    the terms of the GNU Lesser General Public License as published by
     the Free Software Foundation; either version 3 of the License, or
     (at your option) any later version.
 
     0MQ is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    Lesser GNU General Public License for more details.
+    GNU Lesser General Public License for more details.
 
-    You should have received a copy of the Lesser GNU General Public License
+    You should have received a copy of the GNU Lesser General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
-#include <new>
-
 #include "session.hpp"
+#include "socket_base.hpp"
 #include "i_engine.hpp"
 #include "err.hpp"
 #include "pipe.hpp"
+#include "likely.hpp"
 
-zmq::session_t::session_t (object_t *parent_, socket_base_t *owner_,
-      const options_t &options_) :
-    owned_t (parent_, owner_),
+zmq::session_t::session_t (class io_thread_t *io_thread_,
+      class socket_base_t *socket_, const options_t &options_) :
+    own_t (io_thread_, options_),
+    io_object_t (io_thread_),
     in_pipe (NULL),
     incomplete_in (false),
-    active (true),
     out_pipe (NULL),
     engine (NULL),
-    options (options_)
+    socket (socket_),
+    io_thread (io_thread_),
+    pipes_attached (false),
+    delimiter_processed (false),
+    force_terminate (false),
+    has_linger_timer (false),
+    state (active)
 {    
-    //  It's possible to register the session at this point as it will be
-    //  searched for only on reconnect, i.e. no race condition (session found
-    //  before it is plugged into it's I/O thread) is possible.
-    ordinal = owner->register_session (this);
 }
 
-zmq::session_t::session_t (object_t *parent_, socket_base_t *owner_,
-      const options_t &options_, const blob_t &peer_identity_) :
-    owned_t (parent_, owner_),
-    in_pipe (NULL),
-    incomplete_in (false),
-    active (true),
-    out_pipe (NULL),
-    engine (NULL),
-    ordinal (0),
-    peer_identity (peer_identity_),
-    options (options_)
+zmq::session_t::~session_t ()
 {
-    if (!peer_identity.empty () && peer_identity [0] != 0) {
-        if (!owner->register_session (peer_identity, this)) {
+    zmq_assert (!in_pipe);
+    zmq_assert (!out_pipe);
 
-            //  TODO: There's already a session with the specified
-            //  identity. We should presumably syslog it and drop the
-            //  session.
-            zmq_assert (false);
-        }
-    }
+    if (engine)
+        engine->terminate ();
 }
 
-zmq::session_t::~session_t ()
+void zmq::session_t::proceed_with_term ()
 {
-    zmq_assert (!in_pipe);
-    zmq_assert (!out_pipe);
+    if (state == terminating)
+        return;
+
+    zmq_assert (state == pending);
+    state = terminating;
+
+    //  If there's still a pending linger timer, remove it.
+    if (has_linger_timer) {
+        cancel_timer (linger_timer_id);
+        has_linger_timer = false;
+    }
+
+    if (in_pipe) {
+        register_term_acks (1);
+        in_pipe->terminate ();
+    }
+    if (out_pipe) {
+        register_term_acks (1);
+        out_pipe->terminate ();
+    }
+
+    //  The session has already waited for the linger period. We don't want
+    //  the child objects to linger any more thus linger is set to zero.
+    own_t::process_term (0);
 }
 
 bool zmq::session_t::read (::zmq_msg_t *msg_)
 {
-    if (!in_pipe || !active)
+    if (!in_pipe)
         return false;
 
     if (!in_pipe->read (msg_))
@@ -97,17 +108,8 @@ void zmq::session_t::flush ()
         out_pipe->flush ();
 }
 
-void zmq::session_t::detach (owned_t *reconnecter_)
+void zmq::session_t::clean_pipes ()
 {
-    //  Plug in the reconnecter object if any.
-    if (reconnecter_) {
-        send_plug (reconnecter_);
-        send_own (owner, reconnecter_);
-    }
-
-    //  Engine is terminating itself. No need to deallocate it from here.
-    engine = NULL;
-
     //  Get rid of half-processed messages in the out pipe. Flush any
     //  unflushed messages upstream.
     if (out_pipe) {
@@ -127,165 +129,219 @@ void zmq::session_t::detach (owned_t *reconnecter_)
             zmq_msg_close (&msg);
         }
     }
-    
-    //  Terminate transient session.
-    if (!ordinal && (peer_identity.empty () || peer_identity [0] == 0))
-        term ();
-}
-
-zmq::io_thread_t *zmq::session_t::get_io_thread ()
-{
-    return choose_io_thread (options.affinity);
-}
-
-class zmq::socket_base_t *zmq::session_t::get_owner ()
-{
-    return owner;
-}
-
-uint64_t zmq::session_t::get_ordinal ()
-{
-    zmq_assert (ordinal);
-    return ordinal;
 }
 
 void zmq::session_t::attach_pipes (class reader_t *inpipe_,
     class writer_t *outpipe_, const blob_t &peer_identity_)
 {
+    zmq_assert (!pipes_attached);
+    pipes_attached = true;
+    
     if (inpipe_) {
         zmq_assert (!in_pipe);
         in_pipe = inpipe_;
-        active = true;
-        in_pipe->set_endpoint (this);
+        in_pipe->set_event_sink (this);
     }
 
     if (outpipe_) {
         zmq_assert (!out_pipe);
         out_pipe = outpipe_;
-        out_pipe->set_endpoint (this);
+        out_pipe->set_event_sink (this);
+    }
+
+    //  If we are already terminating, terminate the pipes straight away.
+    if (state == terminating) {
+        if (in_pipe) {
+            in_pipe->terminate ();
+            register_term_acks (1);
+        }
+        if (out_pipe) {
+            out_pipe->terminate ();
+            register_term_acks (1);
+        }
     }
 }
 
-void zmq::session_t::detach_inpipe (reader_t *pipe_)
+void zmq::session_t::delimited (reader_t *pipe_)
 {
-    active = false;
-    in_pipe = NULL;
+    zmq_assert (in_pipe == pipe_);
+    zmq_assert (!delimiter_processed);
+    delimiter_processed = true;
+
+    //  If we are in process of being closed, but still waiting for all
+    //  pending messeges being sent, we can terminate here.
+    if (state == pending)
+        proceed_with_term ();
 }
 
-void zmq::session_t::detach_outpipe (writer_t *pipe_)
+void zmq::session_t::terminated (reader_t *pipe_)
 {
-    out_pipe = NULL;
+    zmq_assert (in_pipe == pipe_);
+    in_pipe = NULL;
+    if (state == terminating)
+        unregister_term_ack ();
 }
 
-void zmq::session_t::kill (reader_t *pipe_)
+void zmq::session_t::terminated (writer_t *pipe_)
 {
-    active = false;
+    zmq_assert (out_pipe == pipe_);
+    out_pipe = NULL;
+    if (state == terminating)
+        unregister_term_ack ();
 }
 
-void zmq::session_t::revive (reader_t *pipe_)
+void zmq::session_t::activated (reader_t *pipe_)
 {
     zmq_assert (in_pipe == pipe_);
-    active = true;
-    if (engine)
-        engine->revive ();
+
+    if (likely (engine != NULL))
+        engine->activate_out ();
+    else
+        in_pipe->check_read ();
 }
 
-void zmq::session_t::revive (writer_t *pipe_)
+void zmq::session_t::activated (writer_t *pipe_)
 {
     zmq_assert (out_pipe == pipe_);
     if (engine)
-        engine->resume_input ();
+        engine->activate_in ();
 }
 
 void zmq::session_t::process_plug ()
 {
 }
 
-void zmq::session_t::process_unplug ()
+void zmq::session_t::process_attach (i_engine *engine_,
+    const blob_t &peer_identity_)
 {
-    //  Unregister the session from the socket.
-    if (ordinal)
-        owner->unregister_session (ordinal);
-    else if (!peer_identity.empty () && peer_identity [0] != 0)
-        owner->unregister_session (peer_identity);
-
-    //  Ask associated pipes to terminate.
-    if (in_pipe) {
-        in_pipe->term ();
-        in_pipe = NULL;
+    //  If some other object (e.g. init) notifies us that the connection failed
+    //  we need to start the reconnection process.
+    if (!engine_) {
+        zmq_assert (!engine);
+        detached ();
+        return;
     }
-    if (out_pipe) {
-        out_pipe->term ();
-        out_pipe = NULL;
+
+    //  If we are already terminating, we destroy the engine straight away.
+    //  Note that we don't have to unplug it before deleting as it's not
+    //  yet plugged to the session.
+    if (state == terminating) {
+        delete engine_;
+        return;
     }
 
+    //  If the session already has an engine attached, destroy new one.
+    //  Note new engine is not plugged in yet, we don't have to unplug it.
     if (engine) {
-        engine->unplug ();
-        delete engine;
-        engine = NULL;
+        log ("DPID: duplicate peer identity - disconnecting peer");
+        delete engine_;
+        return;
+    }
+
+    //  Check whether the required pipes already exist. If not so, we'll
+    //  create them and bind them to the socket object.
+    if (!pipes_attached) {
+        zmq_assert (!in_pipe && !out_pipe);
+        pipes_attached = true;
+        reader_t *socket_reader = NULL;
+        writer_t *socket_writer = NULL;
+
+        //  Create the pipes, as required.
+        if (options.requires_in) {
+            create_pipe (socket, this, options.hwm, options.swap, &socket_reader,
+                &out_pipe);
+            out_pipe->set_event_sink (this);
+        }
+        if (options.requires_out) {
+            create_pipe (this, socket, options.hwm, options.swap, &in_pipe,
+                &socket_writer);
+            in_pipe->set_event_sink (this);
+        }
+
+        //  Bind the pipes to the socket object.
+        if (socket_reader || socket_writer)
+            send_bind (socket, socket_reader, socket_writer, peer_identity_);
     }
+
+    //  Plug in the engine.
+    engine = engine_;
+    engine->plug (io_thread, this);
+
+    //  Trigger the notfication about the attachment.
+    attached (peer_identity_);
 }
 
-void zmq::session_t::process_attach (i_engine *engine_,
-    const blob_t &peer_identity_)
+void zmq::session_t::detach ()
 {
-    if (!peer_identity.empty ()) {
-
-        //  If both IDs are temporary, no checking is needed.
-        //  TODO: Old ID should be reused in this case...
-        if (peer_identity.empty () || peer_identity [0] != 0 ||
-            peer_identity_.empty () || peer_identity_ [0] != 0) {
+    //  Engine is dead. Let's forget about it.
+    engine = NULL;
 
-            //  If we already know the peer name do nothing, just check whether
-            //  it haven't changed.
-            zmq_assert (peer_identity == peer_identity_);
-        }
-    }
-    else if (!peer_identity_.empty ()) {
+    //  Remove any half-done messages from the pipes.
+    clean_pipes ();
 
-        //  Store the peer identity.
-        peer_identity = peer_identity_;
+    //  Send the event to the derived class.
+    detached ();
 
-        //  If the session is not registered with the ordinal, let's register
-        //  it using the peer name.
-        if (!ordinal) {
-            if (!owner->register_session (peer_identity, this)) {
+    //  Just in case, there's only a delimiter in the inbound pipe.
+    if (in_pipe)
+        in_pipe->check_read ();
+}
 
-                //  TODO: There's already a session with the specified
-                //  identity. We should presumably syslog it and drop the
-                //  session.
-                zmq_assert (false);
-            }
-        }
+void zmq::session_t::process_term (int linger_)
+{
+    zmq_assert (state == active);
+    state = pending;
+
+    //  If linger is set to zero, we can terminate the session straight away
+    //  not waiting for the pending messages to be sent.
+    if (linger_ == 0) {
+        proceed_with_term ();
+        return;
     }
 
-    //  Check whether the required pipes already exist. If not so, we'll
-    //  create them and bind them to the socket object.
-    reader_t *socket_reader = NULL;
-    writer_t *socket_writer = NULL;
-
-    if (options.requires_in && !out_pipe) {
-        pipe_t *pipe = new (std::nothrow) pipe_t (owner, this, options.hwm, options.swap);
-        zmq_assert (pipe);
-        out_pipe = &pipe->writer;
-        out_pipe->set_endpoint (this);
-        socket_reader = &pipe->reader;
+    //  If there's finite linger value, set up a timer.
+    if (linger_ > 0) {
+       zmq_assert (!has_linger_timer);
+       add_timer (linger_, linger_timer_id);
+       has_linger_timer = true;
     }
 
-    if (options.requires_out && !in_pipe) {
-        pipe_t *pipe = new (std::nothrow) pipe_t (this, owner, options.hwm, options.swap);
-        zmq_assert (pipe);
-        in_pipe = &pipe->reader;
-        in_pipe->set_endpoint (this);
-        socket_writer = &pipe->writer;
-    }
+    //  If there's no engine and there's only delimiter in the pipe it wouldn't
+    //  be ever read. Thus we check for it explicitly.
+    if (in_pipe)
+        in_pipe->check_read ();
+
+    //  If there's no in pipe there are no pending messages to send.
+    //  We can proceed with the shutdown straight away. Also, if there is
+    //  inbound pipe, but the delimiter was already processed, we can
+    //  terminate immediately. Alternatively, if the derived session type have
+    //  called 'terminate' we'll finish straight away.
+    if (!options.requires_out || delimiter_processed || force_terminate ||
+        (!options.immediate_connect && !in_pipe))
+        proceed_with_term ();
+}
 
-    if (socket_reader || socket_writer)
-        send_bind (owner, socket_reader, socket_writer, peer_identity);
+void zmq::session_t::timer_event (int id_)
+{
+    //  Linger period expired. We can proceed with termination even though
+    //  there are still pending messages to be sent.
+    zmq_assert (id_ == linger_timer_id);
+    has_linger_timer = false;
+    proceed_with_term ();
+}
 
-    //  Plug in the engine.
-    zmq_assert (!engine);
-    zmq_assert (engine_);
-    engine = engine_;
-    engine->plug (this);
+bool zmq::session_t::register_session (const blob_t &name_, session_t *session_)
+{
+    return socket->register_session (name_, session_);
+}
+
+void zmq::session_t::unregister_session (const blob_t &name_)
+{
+    socket->unregister_session (name_);
+}
+
+void zmq::session_t::terminate ()
+{
+    force_terminate = true;
+    own_t::terminate ();
 }
diff --git a/src/session.hpp b/src/session.hpp
index 9bda1ad..499c074 100644
--- a/src/session.hpp
+++ b/src/session.hpp
@@ -1,73 +1,103 @@
 /*
-    Copyright (c) 2007-2010 iMatix Corporation
+    Copyright (c) 2007-2011 iMatix Corporation
+    Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
 
     This file is part of 0MQ.
 
     0MQ is free software; you can redistribute it and/or modify it under
-    the terms of the Lesser GNU General Public License as published by
+    the terms of the GNU Lesser General Public License as published by
     the Free Software Foundation; either version 3 of the License, or
     (at your option) any later version.
 
     0MQ is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    Lesser GNU General Public License for more details.
+    GNU Lesser General Public License for more details.
 
-    You should have received a copy of the Lesser GNU General Public License
+    You should have received a copy of the GNU Lesser General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
 #ifndef __ZMQ_SESSION_HPP_INCLUDED__
 #define __ZMQ_SESSION_HPP_INCLUDED__
 
+#include "own.hpp"
 #include "i_inout.hpp"
-#include "i_endpoint.hpp"
-#include "owned.hpp"
-#include "options.hpp"
+#include "io_object.hpp"
 #include "blob.hpp"
+#include "pipe.hpp"
 
 namespace zmq
 {
 
-    class session_t : public owned_t, public i_inout, public i_endpoint
+    class session_t :
+        public own_t,
+        public io_object_t,
+        public i_inout,
+        public i_reader_events,
+        public i_writer_events
     {
     public:
 
-        //  Creates unnamed session.
-        session_t (object_t *parent_, socket_base_t *owner_,
-            const options_t &options_);
+        session_t (class io_thread_t *io_thread_,
+            class socket_base_t *socket_, const options_t &options_);
 
-        //  Creates named session.
-        session_t (object_t *parent_, socket_base_t *owner_,
-            const options_t &options_, const blob_t &peer_identity_);
-
-        //  i_inout interface implementation.
+        //  i_inout interface implementation. Note that detach method is not
+        //  implemented by generic session. Different session types may handle
+        //  engine disconnection in different ways.
         bool read (::zmq_msg_t *msg_);
         bool write (::zmq_msg_t *msg_);
         void flush ();
-        void detach (owned_t *reconnecter_);
-        class io_thread_t *get_io_thread ();
-        class socket_base_t *get_owner ();
-        uint64_t get_ordinal ();
+        void detach ();
 
-        //  i_endpoint interface implementation.
         void attach_pipes (class reader_t *inpipe_, class writer_t *outpipe_,
             const blob_t &peer_identity_);
-        void detach_inpipe (class reader_t *pipe_);
-        void detach_outpipe (class writer_t *pipe_);
-        void kill (class reader_t *pipe_);
-        void revive (class reader_t *pipe_);
-        void revive (class writer_t *pipe_);
 
-    private:
+        //  i_reader_events interface implementation.
+        void activated (class reader_t *pipe_);
+        void terminated (class reader_t *pipe_);
+        void delimited (class reader_t *pipe_);
+
+        //  i_writer_events interface implementation.
+        void activated (class writer_t *pipe_);
+        void terminated (class writer_t *pipe_);
+
+    protected:
+
+        //  This function allows to shut down the session even though
+        //  there are pending messages in the inbound pipe.
+        void terminate ();
+
+        //  Two events for the derived session type. Attached is triggered
+        //  when session is attached to a peer, detached is triggered at the
+        //  beginning of the termination process when session is about to
+        //  be detached from the peer.
+        virtual void attached (const blob_t &peer_identity_) = 0;
+        virtual void detached () = 0;
+
+        //  Allows derives session types to (un)register session names.
+        bool register_session (const blob_t &name_, class session_t *session_);
+        void unregister_session (const blob_t &name_);
 
         ~session_t ();
 
+    private:
+
         //  Handlers for incoming commands.
         void process_plug ();
-        void process_unplug ();
         void process_attach (struct i_engine *engine_,
             const blob_t &peer_identity_);
+        void process_term (int linger_);
+
+        //  i_poll_events handlers.
+        void timer_event (int id_);
+
+        //  Remove any half processed messages. Flush unflushed messages.
+        //  Call this function when engine disconnect to get rid of leftovers.
+        void clean_pipes ();
+
+        //  Call this function to move on with the delayed process_term.
+        void proceed_with_term ();
 
         //  Inbound pipe, i.e. one the session is getting messages from.
         class reader_t *in_pipe;
@@ -76,27 +106,43 @@ namespace zmq
         //  is still in the in pipe.
         bool incomplete_in;
 
-        //  If true, in_pipe is active. Otherwise there are no messages to get.
-        bool active;
-
         //  Outbound pipe, i.e. one the socket is sending messages to.
         class writer_t *out_pipe;
 
+        //  The protocol I/O engine connected to the session.
         struct i_engine *engine;
 
-        //  Session is identified by ordinal in the case when it was created
-        //  before connection to the peer was established and thus we are
-        //  unaware of peer's identity.
-        uint64_t ordinal;
+        //  The socket the session belongs to.
+        class socket_base_t *socket;
+
+        //  I/O thread the session is living in. It will be used to plug in
+        //  the engines into the same thread.
+        class io_thread_t *io_thread;
+
+        //  If true, pipes were already attached to this session.
+        bool pipes_attached;
+
+        //  If true, delimiter was already read from the inbound pipe.
+        bool delimiter_processed;
+
+        //  If true, we should terminate the session even though there are
+        //  pending messages in the inbound pipe.
+        bool force_terminate;
+
+        //  ID of the linger timer
+        enum {linger_timer_id = 0x20};
 
-        //  Identity of the peer.
-        blob_t peer_identity;
+        //  True is linger timer is running.
+        bool has_linger_timer;
 
-        //  Inherited socket options.
-        options_t options;
+        enum {
+            active,
+            pending,
+            terminating
+        } state;
 
         session_t (const session_t&);
-        void operator = (const session_t&);
+        const session_t &operator = (const session_t&);
     };
 
 }
diff --git a/src/signaler.cpp b/src/signaler.cpp
deleted file mode 100644
index d4a9214..0000000
--- a/src/signaler.cpp
+++ /dev/null
@@ -1,351 +0,0 @@
-/*
-    Copyright (c) 2007-2010 iMatix Corporation
-
-    This file is part of 0MQ.
-
-    0MQ is free software; you can redistribute it and/or modify it under
-    the terms of the Lesser GNU General Public License as published by
-    the Free Software Foundation; either version 3 of the License, or
-    (at your option) any later version.
-
-    0MQ is distributed in the hope that it will be useful,
-    but WITHOUT ANY WARRANTY; without even the implied warranty of
-    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    Lesser GNU General Public License for more details.
-
-    You should have received a copy of the Lesser GNU General Public License
-    along with this program.  If not, see <http://www.gnu.org/licenses/>.
-*/
-
-#include "signaler.hpp"
-#include "platform.hpp"
-#include "err.hpp"
-#include "fd.hpp"
-#include "ip.hpp"
-
-#if defined ZMQ_HAVE_OPENVMS
-#include <netinet/tcp.h>
-#include <unistd.h>
-#elif defined ZMQ_HAVE_WINDOWS 
-#include "windows.hpp"
-#else
-#include <unistd.h>
-#include <fcntl.h>
-#include <limits.h>
-#endif
-
-zmq::fd_t zmq::signaler_t::get_fd ()
-{
-    return r;
-}
-
-#if defined ZMQ_HAVE_WINDOWS
-
-zmq::signaler_t::signaler_t ()
-{
-    //  Windows have no 'socketpair' function. CreatePipe is no good as pipe
-    //  handles cannot be polled on. Here we create the socketpair by hand.
-
-    struct sockaddr_in addr;
-    SOCKET listener;
-    int addrlen = sizeof (addr);
-           
-    w = INVALID_SOCKET; 
-    r = INVALID_SOCKET;
-    
-    fd_t rcs = (listener = socket (AF_INET, SOCK_STREAM, 0));
-    wsa_assert (rcs != INVALID_SOCKET);
-
-    memset (&addr, 0, sizeof (addr));
-    addr.sin_family = AF_INET;
-    addr.sin_addr.s_addr = htonl (INADDR_LOOPBACK);
-    addr.sin_port = 0;
-            
-    int rc = bind (listener, (const struct sockaddr*) &addr, sizeof (addr));
-    wsa_assert (rc != SOCKET_ERROR);
-
-    rc = getsockname (listener, (struct sockaddr*) &addr, &addrlen);
-    wsa_assert (rc != SOCKET_ERROR);
-            
-    //  Listen for incomming connections.
-    rc = listen (listener, 1);
-    wsa_assert (rc != SOCKET_ERROR);
-                     
-    //  Create the socket.
-    w = WSASocket (AF_INET, SOCK_STREAM, 0, NULL, 0,  0);
-    wsa_assert (w != INVALID_SOCKET);
-                      
-    //  Connect to the remote peer.
-    rc = connect (w, (sockaddr *) &addr, sizeof (addr));
-    wsa_assert (rc != SOCKET_ERROR);
-                                    
-    //  Accept connection from w.
-    r = accept (listener, NULL, NULL);
-    wsa_assert (r != INVALID_SOCKET);
-
-    //  Set the read site of the pair to non-blocking mode.
-    unsigned long argp = 1;
-    rc = ioctlsocket (r, FIONBIO, &argp);
-    wsa_assert (rc != SOCKET_ERROR);
-
-    //  We don't need the listening socket anymore. Close it.
-    rc = closesocket (listener);
-    wsa_assert (rc != SOCKET_ERROR);
-}
-
-zmq::signaler_t::~signaler_t ()
-{
-    int rc = closesocket (w);
-    wsa_assert (rc != SOCKET_ERROR);
-
-    rc = closesocket (r);
-    wsa_assert (rc != SOCKET_ERROR);
-}
-
-void zmq::signaler_t::send (const command_t &cmd_)
-{
-    //  TODO: Note that send is a blocking operation.
-    //  How should we behave if the signal cannot be written to the signaler?
-    //  Even worse: What if half of a command is written?
-    int rc = ::send (w, (char*) &cmd_, sizeof (command_t), 0);
-    win_assert (rc != SOCKET_ERROR);
-    zmq_assert (rc == sizeof (command_t));
-}
-
-bool zmq::signaler_t::recv (command_t *cmd_, bool block_)
-{
-    if (block_) {
-
-        //  Switch to blocking mode.
-        unsigned long argp = 0;
-        int rc = ioctlsocket (r, FIONBIO, &argp);
-        wsa_assert (rc != SOCKET_ERROR);
-    }
-
-    bool result;
-    int nbytes = ::recv (r, (char*) cmd_, sizeof (command_t), 0);
-    if (nbytes == -1 && WSAGetLastError () == WSAEWOULDBLOCK) {
-        result = false;
-    }
-    else {
-        wsa_assert (nbytes != -1);
-
-        //  Check whether we haven't got half of a signal.
-        zmq_assert (nbytes % sizeof (uint32_t) == 0);
-
-        result = true;
-    }
-
-    if (block_) {
-
-        //  Switch back to non-blocking mode.
-        unsigned long argp = 1;
-        int rc = ioctlsocket (r, FIONBIO, &argp);
-        wsa_assert (rc != SOCKET_ERROR);
-    }
-
-    return result;
-}
-
-#elif defined ZMQ_HAVE_HPUX || defined ZMQ_HAVE_AIX
-
-#include <sys/types.h>
-#include <sys/socket.h>
-
-zmq::signaler_t::signaler_t ()
-{
-    int sv [2];
-    int rc = socketpair (AF_UNIX, SOCK_STREAM, 0, sv);
-    errno_assert (rc == 0);
-    w = sv [0];
-    r = sv [1];
-
-    //  Set the reader to non-blocking mode.
-    int flags = fcntl (r, F_GETFL, 0);
-    if (flags == -1)
-        flags = 0;
-    rc = fcntl (r, F_SETFL, flags | O_NONBLOCK);
-    errno_assert (rc != -1);
-}
-
-zmq::signaler_t::~signaler_t ()
-{
-    close (w);
-    close (r);
-}
-
-void zmq::signaler_t::send (const command_t &cmd_)
-{
-    ssize_t nbytes;
-    do {
-        nbytes = ::send (w, &cmd_, sizeof (command_t), 0);
-    } while (nbytes == -1 && errno == EINTR);
-    errno_assert (nbytes != -1);
-    zmq_assert (nbytes == sizeof (command_t));
-}
-
-bool zmq::signaler_t::recv (command_t *cmd_, bool block_)
-{
-    if (block_) {
-
-        //  Set the reader to blocking mode.
-        int flags = fcntl (r, F_GETFL, 0);
-        if (flags == -1)
-            flags = 0;
-        int rc = fcntl (r, F_SETFL, flags & ~O_NONBLOCK);
-        errno_assert (rc != -1);
-    }
-
-    bool result;
-    ssize_t nbytes;
-    do {
-        nbytes = ::recv (r, (char*) cmd_, sizeof (command_t), 0);
-    } while (nbytes == -1 && errno == EINTR);
-    if (nbytes == -1 && errno == EAGAIN) {
-        result = false;
-    }
-    else {
-        zmq_assert (nbytes != -1);
-
-        //  Check whether we haven't got half of command.
-        zmq_assert (nbytes == sizeof (command_t));
-
-        result = true;
-    }
-
-   if (block_) {
-
-        //  Set the reader to non-blocking mode.
-        int flags = fcntl (r, F_GETFL, 0);
-        if (flags == -1)
-            flags = 0;
-        int rc = fcntl (r, F_SETFL, flags | O_NONBLOCK);
-        errno_assert (rc != -1);
-    }
-
-    return result;
-}
-
-#else
-
-#include <sys/types.h>
-#include <sys/socket.h>
-
-zmq::signaler_t::signaler_t ()
-{
-    //  Make sure that command can be written to the socket in atomic fashion.
-    //  If this wasn't guaranteed, commands from different threads would be
-    //  interleaved.
-    zmq_assert (sizeof (command_t) <= PIPE_BUF);
-
-    int sv [2];
-    int rc = socketpair (AF_UNIX, SOCK_STREAM, 0, sv);
-    errno_assert (rc == 0);
-    w = sv [0];
-    r = sv [1];
-}
-
-zmq::signaler_t::~signaler_t ()
-{
-    close (w);
-    close (r);
-}
-
-void zmq::signaler_t::send (const command_t &cmd_)
-{
-    //  TODO: Note that send is a blocking operation.
-    //  How should we behave if the command cannot be written to the signaler?
-    ssize_t nbytes;
-    do {
-        nbytes = ::send (w, &cmd_, sizeof (command_t), 0);
-    } while (nbytes == -1 && errno == EINTR);
-    errno_assert (nbytes != -1);
-
-    //  This should never happen as we've already checked that command size is
-    //  less than PIPE_BUF.
-    zmq_assert (nbytes == sizeof (command_t));
-}
-
-bool zmq::signaler_t::recv (command_t *cmd_, bool block_)
-{
-    ssize_t nbytes;
-    do {
-        nbytes = ::recv (r, cmd_, sizeof (command_t),
-            block_ ? 0 : MSG_DONTWAIT);
-    } while (nbytes == -1 && errno == EINTR);
-
-    //  If there's no signal available return false.
-    if (nbytes == -1 && errno == EAGAIN)
-        return false;
-
-    errno_assert (nbytes != -1);
-
-    //  Check whether we haven't got half of command.
-    zmq_assert (nbytes == sizeof (command_t));
-
-    return true;
-}
-
-#endif
-
-#if defined ZMQ_HAVE_OPENVMS
-
-int zmq::signaler_t::socketpair (int domain_, int type_, int protocol_,
-    int sv_ [2])
-{
-    int listener;
-    sockaddr_in lcladdr;
-    socklen_t lcladdr_len;
-    int rc;
-    int on = 1;
-
-    zmq_assert (type_ == SOCK_STREAM);
-
-    //  Fill in the localhost address (127.0.0.1).
-    memset (&lcladdr, 0, sizeof (lcladdr));
-    lcladdr.sin_family = AF_INET;
-    lcladdr.sin_addr.s_addr = htonl (INADDR_LOOPBACK);
-    lcladdr.sin_port = 0;
-
-    listener = socket (AF_INET, SOCK_STREAM, 0);
-    errno_assert (listener != -1);
-
-    rc = setsockopt (listener, IPPROTO_TCP, TCP_NODELAY, &on, sizeof (on));
-    errno_assert (rc != -1);
-
-    rc = setsockopt (listener, IPPROTO_TCP, TCP_NODELACK, &on, sizeof (on));
-    errno_assert (rc != -1);
-
-    rc = bind(listener, (struct sockaddr*) &lcladdr, sizeof (lcladdr));
-    errno_assert (rc != -1);
-        
-    lcladdr_len = sizeof (lcladdr);
-
-    rc = getsockname (listener, (struct sockaddr*) &lcladdr, &lcladdr_len);
-    errno_assert (rc != -1);
-
-    rc = listen (listener, 1);
-    errno_assert (rc != -1);
-
-    sv_ [0] = socket (AF_INET, SOCK_STREAM, 0);
-    errno_assert (rc != -1);
-
-    rc = setsockopt (sv_ [0], IPPROTO_TCP, TCP_NODELAY, &on, sizeof (on));
-    errno_assert (rc != -1);
-
-    rc = setsockopt (sv_ [0], IPPROTO_TCP, TCP_NODELACK, &on, sizeof (on));
-    errno_assert (rc != -1);
-
-    rc = connect (sv_ [0], (struct sockaddr*) &lcladdr, sizeof (lcladdr));
-    errno_assert (rc != -1);
-
-    sv_ [1] = accept (listener, NULL, NULL);
-    errno_assert (sv_ [1] != -1);
-
-    close (listener);
-
-    return 0;
-}
-
-#endif
-
diff --git a/src/signaler.hpp b/src/signaler.hpp
deleted file mode 100644
index 64a1899..0000000
--- a/src/signaler.hpp
+++ /dev/null
@@ -1,71 +0,0 @@
-/*
-    Copyright (c) 2007-2010 iMatix Corporation
-
-    This file is part of 0MQ.
-
-    0MQ is free software; you can redistribute it and/or modify it under
-    the terms of the Lesser GNU General Public License as published by
-    the Free Software Foundation; either version 3 of the License, or
-    (at your option) any later version.
-
-    0MQ is distributed in the hope that it will be useful,
-    but WITHOUT ANY WARRANTY; without even the implied warranty of
-    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    Lesser GNU General Public License for more details.
-
-    You should have received a copy of the Lesser GNU General Public License
-    along with this program.  If not, see <http://www.gnu.org/licenses/>.
-*/
-
-#ifndef __ZMQ_SIGNALER_HPP_INCLUDED__
-#define __ZMQ_SIGNALER_HPP_INCLUDED__
-
-#include <stddef.h>
-
-#include "platform.hpp"
-#include "fd.hpp"
-#include "stdint.hpp"
-#include "config.hpp"
-#include "command.hpp"
-
-namespace zmq
-{
-
-    class signaler_t
-    {
-    public:
-
-        signaler_t ();
-        ~signaler_t ();
-
-        fd_t get_fd ();
-        void send (const command_t &cmd_);
-        bool recv (command_t *cmd_, bool block_);
-        
-    private:
-
-#if defined ZMQ_HAVE_OPENVMS
-
-        //  Whilst OpenVMS supports socketpair - it maps to AF_INET only.
-        //  Further, it does not set the socket options TCP_NODELAY and
-        //  TCP_NODELACK which can lead to performance problems. We'll
-        //  overload the socketpair function for this class.
-        //
-        //  The bug will be fixed in V5.6 ECO4 and beyond.  In the
-        //  meantime, we'll create the socket pair manually.
-        static int socketpair (int domain_, int type_, int protocol_,
-            int sv_ [2]);
-#endif
-
-        //  Write & read end of the socketpair.
-        fd_t w;
-        fd_t r;
-
-        //  Disable copying of fd_signeler object.
-        signaler_t (const signaler_t&);
-        void operator = (const signaler_t&);
-    };
-
-}
-
-#endif
diff --git a/src/socket_base.cpp b/src/socket_base.cpp
index c933954..4cefb6f 100644
--- a/src/socket_base.cpp
+++ b/src/socket_base.cpp
@@ -1,19 +1,20 @@
 /*
-    Copyright (c) 2007-2010 iMatix Corporation
+    Copyright (c) 2007-2011 iMatix Corporation
+    Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
 
     This file is part of 0MQ.
 
     0MQ is free software; you can redistribute it and/or modify it under
-    the terms of the Lesser GNU General Public License as published by
+    the terms of the GNU Lesser General Public License as published by
     the Free Software Foundation; either version 3 of the License, or
     (at your option) any later version.
 
     0MQ is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    Lesser GNU General Public License for more details.
+    GNU Lesser General Public License for more details.
 
-    You should have received a copy of the Lesser GNU General Public License
+    You should have received a copy of the GNU Lesser General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
@@ -23,45 +24,203 @@
 
 #include "../include/zmq.h"
 
-#include "socket_base.hpp"
-#include "app_thread.hpp"
+#include "platform.hpp"
+
+#if defined ZMQ_HAVE_WINDOWS
+#include "windows.hpp"
+#if defined _MSC_VER
+#include <intrin.h>
+#endif
+#else
+#include <unistd.h>
+#endif
 
+#include "socket_base.hpp"
 #include "zmq_listener.hpp"
 #include "zmq_connecter.hpp"
 #include "io_thread.hpp"
-#include "session.hpp"
+#include "connect_session.hpp"
 #include "config.hpp"
-#include "owned.hpp"
+#include "clock.hpp"
 #include "pipe.hpp"
 #include "err.hpp"
 #include "ctx.hpp"
 #include "platform.hpp"
-#include "pgm_sender.hpp"
-#include "pgm_receiver.hpp"
 #include "likely.hpp"
 #include "uuid.hpp"
 
-zmq::socket_base_t::socket_base_t (app_thread_t *parent_) :
-    object_t (parent_),
-    pending_term_acks (0),
+#include "pair.hpp"
+#include "pub.hpp"
+#include "sub.hpp"
+#include "req.hpp"
+#include "rep.hpp"
+#include "pull.hpp"
+#include "push.hpp"
+#include "xreq.hpp"
+#include "xrep.hpp"
+#include "xpub.hpp"
+#include "xsub.hpp"
+
+zmq::socket_base_t *zmq::socket_base_t::create (int type_, class ctx_t *parent_,
+    uint32_t tid_)
+{
+    socket_base_t *s = NULL;
+    switch (type_) {
+
+    case ZMQ_PAIR:
+        s = new (std::nothrow) pair_t (parent_, tid_);
+        break;
+    case ZMQ_PUB:
+        s = new (std::nothrow) pub_t (parent_, tid_);
+        break;
+    case ZMQ_SUB:
+        s = new (std::nothrow) sub_t (parent_, tid_);
+        break;
+    case ZMQ_REQ:
+        s = new (std::nothrow) req_t (parent_, tid_);
+        break;
+    case ZMQ_REP:
+        s = new (std::nothrow) rep_t (parent_, tid_);
+        break;
+    case ZMQ_XREQ:
+        s = new (std::nothrow) xreq_t (parent_, tid_);
+        break;
+    case ZMQ_XREP:
+        s = new (std::nothrow) xrep_t (parent_, tid_);
+        break;     
+    case ZMQ_PULL:
+        s = new (std::nothrow) pull_t (parent_, tid_);
+        break;
+    case ZMQ_PUSH:
+        s = new (std::nothrow) push_t (parent_, tid_);
+        break;
+    case ZMQ_XPUB:
+        s = new (std::nothrow) xpub_t (parent_, tid_);
+        break;
+    case ZMQ_XSUB:
+        s = new (std::nothrow) xsub_t (parent_, tid_);
+        break;    
+    default:
+        errno = EINVAL;
+        return NULL;
+    }
+    alloc_assert (s);
+    return s;
+}
+
+zmq::socket_base_t::socket_base_t (ctx_t *parent_, uint32_t tid_) :
+    own_t (parent_, tid_),
+    ctx_terminated (false),
+    destroyed (false),
+    last_tsc (0),
     ticks (0),
-    rcvmore (false),
-    app_thread (parent_),
-    shutting_down (false),
-    sent_seqnum (0),
-    processed_seqnum (0),
-    next_ordinal (1)
+    rcvmore (false)
 {
 }
 
 zmq::socket_base_t::~socket_base_t ()
 {
+    zmq_assert (destroyed);
+
+    //  Check whether there are no session leaks.
+    sessions_sync.lock ();
+    zmq_assert (sessions.empty ());
+    sessions_sync.unlock ();
+}
+
+zmq::mailbox_t *zmq::socket_base_t::get_mailbox ()
+{
+    return &mailbox;
+}
+
+void zmq::socket_base_t::stop ()
+{
+    //  Called by ctx when it is terminated (zmq_term).
+    //  'stop' command is sent from the threads that called zmq_term to
+    //  the thread owning the socket. This way, blocking call in the
+    //  owner thread can be interrupted.
+    send_stop ();
+}
+
+int zmq::socket_base_t::parse_uri (const char *uri_,
+                        std::string &protocol_, std::string &address_)
+{
+    zmq_assert (uri_ != NULL);
+
+    std::string uri (uri_);
+    std::string::size_type pos = uri.find ("://");
+    if (pos == std::string::npos) {
+        errno = EINVAL;
+        return -1;
+    }
+    protocol_ = uri.substr (0, pos);
+    address_ = uri.substr (pos + 3);
+    if (protocol_.empty () || address_.empty ()) {
+        errno = EINVAL;
+        return -1;
+    }
+    return 0;
+}
+
+int zmq::socket_base_t::check_protocol (const std::string &protocol_)
+{
+    //  First check out whether the protcol is something we are aware of.
+    if (protocol_ != "inproc" && protocol_ != "ipc" && protocol_ != "tcp" &&
+          protocol_ != "pgm" && protocol_ != "epgm" && protocol_ != "sys") {
+        errno = EPROTONOSUPPORT;
+        return -1;
+    }
+
+    //  If 0MQ is not compiled with OpenPGM, pgm and epgm transports
+    //  are not avaialble.
+#if !defined ZMQ_HAVE_OPENPGM
+    if (protocol_ == "pgm" || protocol_ == "epgm") {
+        errno = EPROTONOSUPPORT;
+        return -1;
+    }
+#endif
+
+    //  IPC transport is not available on Windows and OpenVMS.
+#if defined ZMQ_HAVE_WINDOWS || defined ZMQ_HAVE_OPENVMS
+    if (protocol_ == "ipc") {
+        //  Unknown protocol.
+        errno = EPROTONOSUPPORT;
+        return -1;
+    }
+#endif
+
+    //  Check whether socket type and transport protocol match.
+    //  Specifically, multicast protocols can't be combined with
+    //  bi-directional messaging patterns (socket types).
+    if ((protocol_ == "pgm" || protocol_ == "epgm") &&
+          options.type != ZMQ_PUB && options.type != ZMQ_SUB &&
+          options.type != ZMQ_XPUB && options.type != ZMQ_XSUB) {
+        errno = ENOCOMPATPROTO;
+        return -1;
+    }
+
+    //  Protocol is available.
+    return 0;
+}
+
+void zmq::socket_base_t::attach_pipes (class reader_t *inpipe_,
+    class writer_t *outpipe_, const blob_t &peer_identity_)
+{
+    // If the peer haven't specified it's identity, let's generate one.
+    if (peer_identity_.size ()) {
+        xattach_pipes (inpipe_, outpipe_, peer_identity_);
+    }
+    else {
+        blob_t identity (1, 0);
+        identity.append (uuid_t ().to_blob (), uuid_t::uuid_blob_len);
+        xattach_pipes (inpipe_, outpipe_, identity);
+    }
 }
 
 int zmq::socket_base_t::setsockopt (int option_, const void *optval_,
     size_t optvallen_)
 {
-    if (unlikely (app_thread->is_terminated ())) {
+    if (unlikely (ctx_terminated)) {
         errno = ETERM;
         return -1;
     }
@@ -79,7 +238,7 @@ int zmq::socket_base_t::setsockopt (int option_, const void *optval_,
 int zmq::socket_base_t::getsockopt (int option_, void *optval_,
     size_t *optvallen_)
 {
-    if (unlikely (app_thread->is_terminated ())) {
+    if (unlikely (ctx_terminated)) {
         errno = ETERM;
         return -1;
     }
@@ -94,271 +253,227 @@ int zmq::socket_base_t::getsockopt (int option_, void *optval_,
         return 0;
     }
 
+    if (option_ == ZMQ_FD) {
+        if (*optvallen_ < sizeof (fd_t)) {
+            errno = EINVAL;
+            return -1;
+        }
+        *((fd_t*) optval_) = mailbox.get_fd ();
+        *optvallen_ = sizeof (fd_t);
+        return 0;
+    }
+
+    if (option_ == ZMQ_EVENTS) {
+        if (*optvallen_ < sizeof (uint32_t)) {
+            errno = EINVAL;
+            return -1;
+        }
+        int rc = process_commands (false, false);
+        if (rc != 0 && (errno == EINTR || errno == ETERM))
+            return -1;
+        errno_assert (rc == 0);
+        *((uint32_t*) optval_) = 0;
+        if (has_out ())
+            *((uint32_t*) optval_) |= ZMQ_POLLOUT;
+        if (has_in ())
+            *((uint32_t*) optval_) |= ZMQ_POLLIN;
+        *optvallen_ = sizeof (uint32_t);
+        return 0;
+    }
+
     return options.getsockopt (option_, optval_, optvallen_);
 }
 
 int zmq::socket_base_t::bind (const char *addr_)
 {
-    if (unlikely (app_thread->is_terminated ())) {
+    if (unlikely (ctx_terminated)) {
         errno = ETERM;
         return -1;
     }
 
     //  Parse addr_ string.
-    std::string addr_type;
-    std::string addr_args;
-
-    std::string addr (addr_);
-    std::string::size_type pos = addr.find ("://");
-
-    if (pos == std::string::npos) {
-        errno = EINVAL;
+    std::string protocol;
+    std::string address;
+    int rc = parse_uri (addr_, protocol, address);
+    if (rc != 0)
         return -1;
-    }
 
-    addr_type = addr.substr (0, pos);
-    addr_args = addr.substr (pos + 3);
+    rc = check_protocol (protocol);
+    if (rc != 0)
+        return -1;
 
-    if (addr_type == "inproc")
-        return register_endpoint (addr_args.c_str (), this);
+    if (protocol == "inproc" || protocol == "sys") {
+        endpoint_t endpoint = {this, options};
+        return register_endpoint (addr_, endpoint);
+    }
 
-    if (addr_type == "tcp" || addr_type == "ipc") {
+    if (protocol == "tcp" || protocol == "ipc") {
 
-#if defined ZMQ_HAVE_WINDOWS || defined ZMQ_HAVE_OPENVMS
-        if (addr_type == "ipc") {
-            errno = EPROTONOSUPPORT;
+        //  Choose I/O thread to run the listerner in.
+        io_thread_t *io_thread = choose_io_thread (options.affinity);
+        if (!io_thread) {
+            errno = EMTHREAD;
             return -1;
         }
-#endif
 
+        //  Create and run the listener.
         zmq_listener_t *listener = new (std::nothrow) zmq_listener_t (
-            choose_io_thread (options.affinity), this, options);
-        zmq_assert (listener);
-        int rc = listener->set_address (addr_type.c_str(), addr_args.c_str ());
+            io_thread, this, options);
+        alloc_assert (listener);
+        int rc = listener->set_address (protocol.c_str(), address.c_str ());
         if (rc != 0) {
             delete listener;
             return -1;
         }
+        launch_child (listener);
 
-        send_plug (listener);
-        send_own (this, listener);
         return 0;
     }
 
-#if defined ZMQ_HAVE_OPENPGM
-    if (addr_type == "pgm" || addr_type == "epgm") {
-        //  In the case of PGM bind behaves the same like connect.
+    if (protocol == "pgm" || protocol == "epgm") {
+
+        //  For convenience's sake, bind can be used interchageable with
+        //  connect for PGM and EPGM transports.
         return connect (addr_); 
     }
-#endif
 
-    //  Unknown protocol.
-    errno = EPROTONOSUPPORT;
+    zmq_assert (false);
     return -1;
 }
 
 int zmq::socket_base_t::connect (const char *addr_)
 {
-    if (unlikely (app_thread->is_terminated ())) {
+    if (unlikely (ctx_terminated)) {
         errno = ETERM;
         return -1;
     }
 
     //  Parse addr_ string.
-    std::string addr_type;
-    std::string addr_args;
-
-    std::string addr (addr_);
-    std::string::size_type pos = addr.find ("://");
-
-    if (pos == std::string::npos) {
-        errno = EINVAL;
+    std::string protocol;
+    std::string address;
+    int rc = parse_uri (addr_, protocol, address);
+    if (rc != 0)
         return -1;
-    }
 
-    addr_type = addr.substr (0, pos);
-    addr_args = addr.substr (pos + 3);
+    rc = check_protocol (protocol);
+    if (rc != 0)
+        return -1;
 
-    if (addr_type == "inproc") {
+    if (protocol == "inproc" || protocol == "sys") {
 
         //  TODO: inproc connect is specific with respect to creating pipes
         //  as there's no 'reconnect' functionality implemented. Once that
         //  is in place we should follow generic pipe creation algorithm.
 
-        //  Find the peer socket.
-        socket_base_t *peer = find_endpoint (addr_args.c_str ());
-        if (!peer)
+        //  Find the peer endpoint.
+        endpoint_t peer = find_endpoint (addr_);
+        if (!peer.socket)
             return -1;
 
-        pipe_t *in_pipe = NULL;
-        pipe_t *out_pipe = NULL;
+        reader_t *inpipe_reader = NULL;
+        writer_t *inpipe_writer = NULL;
+        reader_t *outpipe_reader = NULL;
+        writer_t *outpipe_writer = NULL;
+
+        // The total HWM for an inproc connection should be the sum of
+        // the binder's HWM and the connector's HWM.  (Similarly for the
+        // SWAP.)
+        int64_t  hwm;
+        if (options.hwm == 0 || peer.options.hwm == 0)
+            hwm = 0;
+        else
+            hwm = options.hwm + peer.options.hwm;
+        int64_t swap;
+        if (options.swap == 0 && peer.options.swap == 0)
+            swap = 0;
+        else
+            swap = options.swap + peer.options.swap;
 
         //  Create inbound pipe, if required.
-        if (options.requires_in) {
-            in_pipe = new (std::nothrow) pipe_t (this, peer, options.hwm, options.swap);
-            zmq_assert (in_pipe);
-        }
+        if (options.requires_in)
+            create_pipe (this, peer.socket, hwm, swap,
+                &inpipe_reader, &inpipe_writer);
 
         //  Create outbound pipe, if required.
-        if (options.requires_out) {
-            out_pipe = new (std::nothrow) pipe_t (peer, this, options.hwm, options.swap);
-            zmq_assert (out_pipe);
-        }
+        if (options.requires_out)
+            create_pipe (peer.socket, this, hwm, swap,
+                &outpipe_reader, &outpipe_writer);
 
         //  Attach the pipes to this socket object.
-        attach_pipes (in_pipe ? &in_pipe->reader : NULL,
-            out_pipe ? &out_pipe->writer : NULL, blob_t ());
+        attach_pipes (inpipe_reader, outpipe_writer, peer.options.identity);
 
         //  Attach the pipes to the peer socket. Note that peer's seqnum
-        //  was incremented in find_endpoint function. The callee is notified
-        //  about the fact via the last parameter.
-        send_bind (peer, out_pipe ? &out_pipe->reader : NULL,
-            in_pipe ? &in_pipe->writer : NULL, options.identity, false);
+        //  was incremented in find_endpoint function. We don't need it
+        //  increased here.
+        send_bind (peer.socket, outpipe_reader, inpipe_writer,
+            options.identity, false);
 
         return 0;
     }
 
-    //  Create unnamed session.
+    //  Choose the I/O thread to run the session in.
     io_thread_t *io_thread = choose_io_thread (options.affinity);
-    session_t *session = new (std::nothrow) session_t (io_thread,
-        this, options);
-    zmq_assert (session);
+    if (!io_thread) {
+        errno = EMTHREAD;
+        return -1;
+    }
+
+    //  Create session.
+    connect_session_t *session = new (std::nothrow) connect_session_t (
+        io_thread, this, options, protocol.c_str (), address.c_str ());
+    alloc_assert (session);
 
-    //  If 'immediate connect' feature is required, we'll created the pipes
+    //  If 'immediate connect' feature is required, we'll create the pipes
     //  to the session straight away. Otherwise, they'll be created by the
     //  session once the connection is established.
     if (options.immediate_connect) {
 
-        pipe_t *in_pipe = NULL;
-        pipe_t *out_pipe = NULL;
+        reader_t *inpipe_reader = NULL;
+        writer_t *inpipe_writer = NULL;
+        reader_t *outpipe_reader = NULL;
+        writer_t *outpipe_writer = NULL;
 
         //  Create inbound pipe, if required.
-        if (options.requires_in) {
-            in_pipe = new (std::nothrow) pipe_t (this, session, options.hwm, options.swap);
-            zmq_assert (in_pipe);
-
-        }
+        if (options.requires_in)
+            create_pipe (this, session, options.hwm, options.swap,
+                &inpipe_reader, &inpipe_writer);
 
         //  Create outbound pipe, if required.
-        if (options.requires_out) {
-            out_pipe = new (std::nothrow) pipe_t (session, this, options.hwm, options.swap);
-            zmq_assert (out_pipe);
-        }
+        if (options.requires_out)
+            create_pipe (session, this, options.hwm, options.swap,
+                &outpipe_reader, &outpipe_writer);
 
         //  Attach the pipes to the socket object.
-        attach_pipes (in_pipe ? &in_pipe->reader : NULL,
-            out_pipe ? &out_pipe->writer : NULL, blob_t ());
+        attach_pipes (inpipe_reader, outpipe_writer, blob_t ());
 
         //  Attach the pipes to the session object.
-        session->attach_pipes (out_pipe ? &out_pipe->reader : NULL,
-            in_pipe ? &in_pipe->writer : NULL, blob_t ());
+        session->attach_pipes (outpipe_reader, inpipe_writer, blob_t ());
     }
 
-    //  Activate the session.
-    send_plug (session);
-    send_own (this, session);
-
-    if (addr_type == "tcp" || addr_type == "ipc") {
-
-#if defined ZMQ_HAVE_WINDOWS || defined ZMQ_HAVE_OPENVMS
-        //  Windows named pipes are not compatible with Winsock API.
-        //  There's no UNIX domain socket implementation on OpenVMS.
-        if (addr_type == "ipc") {
-            errno = EPROTONOSUPPORT;
-            return -1;
-        }
-#endif
-
-        //  Create the connecter object. Supply it with the session name
-        //  so that it can bind the new connection to the session once
-        //  it is established.
-        zmq_connecter_t *connecter = new (std::nothrow) zmq_connecter_t (
-            choose_io_thread (options.affinity), this, options,
-            session->get_ordinal (), false);
-        zmq_assert (connecter);
-        int rc = connecter->set_address (addr_type.c_str(), addr_args.c_str ());
-        if (rc != 0) {
-            delete connecter;
-            return -1;
-        }
-        send_plug (connecter);
-        send_own (this, connecter);
+    //  Activate the session. Make it a child of this socket.
+    launch_child (session);
 
-        return 0;
-    }
-
-#if defined ZMQ_HAVE_OPENPGM
-    if (addr_type == "pgm" || addr_type == "epgm") {
-
-        //  If the socket type requires bi-directional communication
-        //  multicast is not an option (it is uni-directional).
-        if (options.requires_in && options.requires_out) {
-            errno = ENOCOMPATPROTO;
-            return -1;
-        }
-
-        //  For epgm, pgm transport with UDP encapsulation is used.
-        bool udp_encapsulation = (addr_type == "epgm");
-
-        //  At this point we'll create message pipes to the session straight
-        //  away. There's no point in delaying it as no concept of 'connect'
-        //  exists with PGM anyway.
-        if (options.requires_out) {
-
-            //  PGM sender.
-            pgm_sender_t *pgm_sender =  new (std::nothrow) pgm_sender_t (
-                choose_io_thread (options.affinity), options);
-            zmq_assert (pgm_sender);
-
-            int rc = pgm_sender->init (udp_encapsulation, addr_args.c_str ());
-            if (rc != 0) {
-                delete pgm_sender;
-                return -1;
-            }
-
-            send_attach (session, pgm_sender, blob_t ());
-        }
-        else if (options.requires_in) {
-
-            //  PGM receiver.
-            pgm_receiver_t *pgm_receiver =  new (std::nothrow) pgm_receiver_t (
-                choose_io_thread (options.affinity), options);
-            zmq_assert (pgm_receiver);
-
-            int rc = pgm_receiver->init (udp_encapsulation, addr_args.c_str ());
-            if (rc != 0) {
-                delete pgm_receiver;
-                return -1;
-            }
-
-            send_attach (session, pgm_receiver, blob_t ());
-        }
-        else
-            zmq_assert (false);
-
-        return 0;
-    }
-#endif
-
-    //  Unknown protoco.
-    errno = EPROTONOSUPPORT;
-    return -1;
+    return 0;
 }
 
 int zmq::socket_base_t::send (::zmq_msg_t *msg_, int flags_)
 {
-    //  Process pending commands, if any.
-    if (unlikely (!app_thread->process_commands (false, true))) {
+    if (unlikely (ctx_terminated)) {
         errno = ETERM;
         return -1;
     }
 
+    //  Process pending commands, if any.
+    int rc = process_commands (false, true);
+    if (unlikely (rc != 0))
+        return -1;
+
     //  At this point we impose the MORE flag on the message.
     if (flags_ & ZMQ_SNDMORE)
         msg_->flags |= ZMQ_MSG_MORE;
 
     //  Try to send the message.
-    int rc = xsend (msg_, flags_);
+    rc = xsend (msg_, flags_);
     if (rc == 0)
         return 0;
 
@@ -372,10 +487,8 @@ int zmq::socket_base_t::send (::zmq_msg_t *msg_, int flags_)
     while (rc != 0) {
         if (errno != EAGAIN)
             return -1;
-        if (unlikely (!app_thread->process_commands (true, false))) {
-            errno = ETERM;
+        if (unlikely (process_commands (true, false) != 0))
             return -1;
-        }
         rc = xsend (msg_, flags_);
     }
     return 0;
@@ -383,6 +496,11 @@ int zmq::socket_base_t::send (::zmq_msg_t *msg_, int flags_)
 
 int zmq::socket_base_t::recv (::zmq_msg_t *msg_, int flags_)
 {
+    if (unlikely (ctx_terminated)) {
+        errno = ETERM;
+        return -1;
+    }
+
     //  Get the message.
     int rc = xrecv (msg_, flags_);
     int err = errno;
@@ -394,12 +512,10 @@ int zmq::socket_base_t::recv (::zmq_msg_t *msg_, int flags_)
     //
     //  Note that 'recv' uses different command throttling algorithm (the one
     //  described above) from the one used by 'send'. This is because counting
-    //  ticks is more efficient than doing rdtsc all the time.
+    //  ticks is more efficient than doing RDTSC all the time.
     if (++ticks == inbound_poll_rate) {
-        if (unlikely (!app_thread->process_commands (false, false))) {
-            errno = ETERM;
+        if (unlikely (process_commands (false, false) != 0))
             return -1;
-        }
         ticks = 0;
     }
 
@@ -415,15 +531,14 @@ int zmq::socket_base_t::recv (::zmq_msg_t *msg_, int flags_)
     errno = err;
 
     //  If the message cannot be fetched immediately, there are two scenarios.
-    //  For non-blocking recv, commands are processed in case there's a revive
-    //  command already waiting int a command pipe. If it's not, return EAGAIN.
+    //  For non-blocking recv, commands are processed in case there's an
+    //  activate_reader command already waiting int a command pipe.
+    //  If it's not, return EAGAIN.
     if (flags_ & ZMQ_NOBLOCK) {
         if (errno != EAGAIN)
             return -1;
-        if (unlikely (!app_thread->process_commands (false, false))) {
-            errno = ETERM;
+        if (unlikely (process_commands (false, false) != 0))
             return -1;
-        }
         ticks = 0;
 
         rc = xrecv (msg_, flags_);
@@ -437,15 +552,15 @@ int zmq::socket_base_t::recv (::zmq_msg_t *msg_, int flags_)
 
     //  In blocking scenario, commands are processed over and over again until
     //  we are able to fetch a message.
+    bool block = (ticks != 0);
     while (rc != 0) {
         if (errno != EAGAIN)
             return -1;
-        if (unlikely (!app_thread->process_commands (true, false))) {
-            errno = ETERM;
+        if (unlikely (process_commands (block, false) != 0))
             return -1;
-        }
         rc = xrecv (msg_, flags_);
         ticks = 0;
+        block = true;
     }
 
     rcvmore = msg_->flags & ZMQ_MSG_MORE;
@@ -456,74 +571,14 @@ int zmq::socket_base_t::recv (::zmq_msg_t *msg_, int flags_)
 
 int zmq::socket_base_t::close ()
 {
-    shutting_down = true;
-
-    //  Let the thread know that the socket is no longer available.
-    app_thread->remove_socket (this);
-
-    //  Pointer to the context must be retrieved before the socket is
-    //  deallocated. Afterwards it is not available.
-    ctx_t *ctx = get_ctx ();
-
-    //  Unregister all inproc endpoints associated with this socket.
-    //  From this point we are sure that inc_seqnum won't be called again
-    //  on this object.
-    ctx->unregister_endpoints (this);
-
-    //  Wait till all undelivered commands are delivered. This should happen
-    //  very quickly. There's no way to wait here for extensive period of time.
-    while (processed_seqnum != sent_seqnum.get ())
-        app_thread->process_commands (true, false);
-
-    while (true) {
-
-        //  On third pass of the loop there should be no more I/O objects
-        //  because all connecters and listerners were destroyed during
-        //  the first pass and all engines delivered by delayed 'own' commands
-        //  are destroyed during the second pass.
-        if (io_objects.empty () && !pending_term_acks)
-            break;
-
-        //  Send termination request to all associated I/O objects.
-        for (io_objects_t::iterator it = io_objects.begin ();
-              it != io_objects.end (); it++)
-            send_term (*it);
-
-        //  Move the objects to the list of pending term acks.
-        pending_term_acks += io_objects.size ();
-        io_objects.clear ();
-
-        //  Process commands till we get all the termination acknowledgements.
-        while (pending_term_acks)
-            app_thread->process_commands (true, false);
-    }
-
-    //  Check whether there are no session leaks.
-    sessions_sync.lock ();
-    zmq_assert (named_sessions.empty ());
-    zmq_assert (unnamed_sessions.empty ());
-    sessions_sync.unlock ();
-
-    delete this;
-
-    //  This function must be called after the socket is completely deallocated
-    //  as it may cause termination of the whole 0MQ infrastructure.
-    ctx->destroy_socket ();
+    //  Transfer the ownership of the socket from this application thread
+    //  to the reaper thread which will take care of the rest of shutdown
+    //  process.
+    send_reap (this);
 
     return 0;
 }
 
-void zmq::socket_base_t::inc_seqnum ()
-{
-    //  NB: This function may be called from a different thread!
-    sent_seqnum.add (1);
-}
-
-zmq::app_thread_t *zmq::socket_base_t::get_thread ()
-{
-    return app_thread;
-}
-
 bool zmq::socket_base_t::has_in ()
 {
     return xhas_in ();
@@ -534,30 +589,30 @@ bool zmq::socket_base_t::has_out ()
     return xhas_out ();
 }
 
-bool zmq::socket_base_t::register_session (const blob_t &peer_identity_,
+bool zmq::socket_base_t::register_session (const blob_t &name_,
     session_t *session_)
 {
     sessions_sync.lock ();
-    bool registered = named_sessions.insert (
-        std::make_pair (peer_identity_, session_)).second;
+    bool registered = sessions.insert (
+        sessions_t::value_type (name_, session_)).second;
     sessions_sync.unlock ();
     return registered;
 }
 
-void zmq::socket_base_t::unregister_session (const blob_t &peer_identity_)
+void zmq::socket_base_t::unregister_session (const blob_t &name_)
 {
     sessions_sync.lock ();
-    named_sessions_t::iterator it = named_sessions.find (peer_identity_);
-    zmq_assert (it != named_sessions.end ());
-    named_sessions.erase (it);
+    sessions_t::iterator it = sessions.find (name_);
+    zmq_assert (it != sessions.end ());
+    sessions.erase (it);
     sessions_sync.unlock ();
 }
 
-zmq::session_t *zmq::socket_base_t::find_session (const blob_t &peer_identity_)
+zmq::session_t *zmq::socket_base_t::find_session (const blob_t &name_)
 {
     sessions_sync.lock ();
-    named_sessions_t::iterator it = named_sessions.find (peer_identity_);
-    if (it == named_sessions.end ()) {
+    sessions_t::iterator it = sessions.find (name_);
+    if (it == sessions.end ()) {
         sessions_sync.unlock ();
         return NULL;
     }
@@ -570,129 +625,164 @@ zmq::session_t *zmq::socket_base_t::find_session (const blob_t &peer_identity_)
     return session;    
 }
 
-uint64_t zmq::socket_base_t::register_session (session_t *session_)
+void zmq::socket_base_t::start_reaping (poller_t *poller_)
 {
-    sessions_sync.lock ();
-    uint64_t ordinal = next_ordinal;
-    next_ordinal++;
-    unnamed_sessions.insert (std::make_pair (ordinal, session_));
-    sessions_sync.unlock ();
-    return ordinal;
+    poller = poller_;
+    handle = poller->add_fd (mailbox.get_fd (), this);
+    poller->set_pollin (handle);
 }
 
-void zmq::socket_base_t::unregister_session (uint64_t ordinal_)
+int zmq::socket_base_t::process_commands (bool block_, bool throttle_)
 {
-    sessions_sync.lock ();
-    unnamed_sessions_t::iterator it = unnamed_sessions.find (ordinal_);
-    zmq_assert (it != unnamed_sessions.end ());
-    unnamed_sessions.erase (it);
-    sessions_sync.unlock ();
-}
+    int rc;
+    command_t cmd;
+    if (block_) {
+        rc = mailbox.recv (&cmd, true);
+        if (rc == -1 && errno == EINTR)
+            return -1;
+        errno_assert (rc == 0);
+    }
+    else {
 
-zmq::session_t *zmq::socket_base_t::find_session (uint64_t ordinal_)
-{
-    sessions_sync.lock ();
+        //  Get the CPU's tick counter. If 0, the counter is not available.
+        uint64_t tsc = zmq::clock_t::rdtsc ();
+
+        //  Optimised version of command processing - it doesn't have to check
+        //  for incoming commands each time. It does so only if certain time
+        //  elapsed since last command processing. Command delay varies
+        //  depending on CPU speed: It's ~1ms on 3GHz CPU, ~2ms on 1.5GHz CPU
+        //  etc. The optimisation makes sense only on platforms where getting
+        //  a timestamp is a very cheap operation (tens of nanoseconds).
+        if (tsc && throttle_) {
+
+            //  Check whether TSC haven't jumped backwards (in case of migration
+            //  between CPU cores) and whether certain time have elapsed since
+            //  last command processing. If it didn't do nothing.
+            if (tsc >= last_tsc && tsc - last_tsc <= max_command_delay)
+                return 0;
+            last_tsc = tsc;
+        }
 
-    unnamed_sessions_t::iterator it = unnamed_sessions.find (ordinal_);
-    if (it == unnamed_sessions.end ()) {
-        sessions_sync.unlock ();
-        return NULL;
+        //  Check whether there are any commands pending for this thread.
+        rc = mailbox.recv (&cmd, false);
     }
-    session_t *session = it->second;
 
-    //  Prepare the session for subsequent attach command.
-    session->inc_seqnum ();
+    //  Process all the commands available at the moment.
+    while (true) {
+        if (rc == -1 && errno == EAGAIN)
+            break;
+        if (rc == -1 && errno == EINTR)
+            return -1;
+        errno_assert (rc == 0);
+        cmd.destination->process_command (cmd);
+        rc = mailbox.recv (&cmd, false);
+     }
 
-    sessions_sync.unlock ();
-    return session; 
+    if (ctx_terminated) {
+        errno = ETERM;
+        return -1;
+    }
+
+    return 0;
 }
 
-void zmq::socket_base_t::kill (reader_t *pipe_)
+void zmq::socket_base_t::process_stop ()
 {
-    xkill (pipe_);
+    //  Here, someone have called zmq_term while the socket was still alive.
+    //  We'll remember the fact so that any blocking call is interrupted and any
+    //  further attempt to use the socket will return ETERM. The user is still
+    //  responsible for calling zmq_close on the socket though!
+    ctx_terminated = true;
 }
 
-void zmq::socket_base_t::revive (reader_t *pipe_)
+void zmq::socket_base_t::process_bind (reader_t *in_pipe_, writer_t *out_pipe_,
+    const blob_t &peer_identity_)
 {
-    xrevive (pipe_);
+    attach_pipes (in_pipe_, out_pipe_, peer_identity_);
 }
 
-void zmq::socket_base_t::revive (writer_t *pipe_)
+void zmq::socket_base_t::process_unplug ()
 {
-    xrevive (pipe_);
 }
 
-void zmq::socket_base_t::attach_pipes (class reader_t *inpipe_,
-    class writer_t *outpipe_, const blob_t &peer_identity_)
+void zmq::socket_base_t::process_term (int linger_)
 {
-    if (inpipe_)
-        inpipe_->set_endpoint (this);
-    if (outpipe_)
-        outpipe_->set_endpoint (this);
+    //  Unregister all inproc endpoints associated with this socket.
+    //  Doing this we make sure that no new pipes from other sockets (inproc)
+    //  will be initiated.
+    unregister_endpoints (this);
 
-    //  If the peer haven't specified it's identity, let's generate one.
-    if (peer_identity_.size ()) {
-        xattach_pipes (inpipe_, outpipe_, peer_identity_);
-    }
-    else {
-        blob_t identity (1, 0);
-        identity.append (uuid_t ().to_blob (), uuid_t::uuid_blob_len);
-        xattach_pipes (inpipe_, outpipe_, identity);
-    }
+    //  Continue the termination process immediately.
+    own_t::process_term (linger_);
 }
 
-void zmq::socket_base_t::detach_inpipe (class reader_t *pipe_)
+void zmq::socket_base_t::process_destroy ()
 {
-    xdetach_inpipe (pipe_);
-    pipe_->set_endpoint (NULL); // ?
+    destroyed = true;
 }
 
-void zmq::socket_base_t::detach_outpipe (class writer_t *pipe_)
+int zmq::socket_base_t::xsetsockopt (int option_, const void *optval_,
+    size_t optvallen_)
 {
-    xdetach_outpipe (pipe_);
-    pipe_->set_endpoint (NULL); // ?
+    errno = EINVAL;
+    return -1;
 }
 
-void zmq::socket_base_t::process_own (owned_t *object_)
+bool zmq::socket_base_t::xhas_out ()
 {
-    io_objects.insert (object_);
+    return false;
 }
 
-void zmq::socket_base_t::process_bind (reader_t *in_pipe_, writer_t *out_pipe_,
-    const blob_t &peer_identity_)
+int zmq::socket_base_t::xsend (zmq_msg_t *msg_, int options_)
 {
-    attach_pipes (in_pipe_, out_pipe_, peer_identity_);
+    errno = ENOTSUP;
+    return -1;
 }
 
-void zmq::socket_base_t::process_term_req (owned_t *object_)
+bool zmq::socket_base_t::xhas_in ()
 {
-    //  When shutting down we can ignore termination requests from owned
-    //  objects. They are going to be terminated anyway.
-    if (shutting_down)
-        return;
-
-    //  If I/O object is well and alive ask it to terminate.
-    io_objects_t::iterator it = std::find (io_objects.begin (),
-        io_objects.end (), object_);
+    return false;
+}
 
-    //  If not found, we assume that termination request was already sent to
-    //  the object so we can sagely ignore the request.
-    if (it == io_objects.end ())
-        return;
+int zmq::socket_base_t::xrecv (zmq_msg_t *msg_, int options_)
+{
+    errno = ENOTSUP;
+    return -1;
+}
 
-    pending_term_acks++;
-    io_objects.erase (it);
-    send_term (object_);
+void zmq::socket_base_t::in_event ()
+{
+    //  Process any commands from other threads/sockets that may be available
+    //  at the moment. Ultimately, socket will be destroyed.
+    process_commands (false, false);
+    check_destroy ();
 }
 
-void zmq::socket_base_t::process_term_ack ()
+void zmq::socket_base_t::out_event ()
 {
-    zmq_assert (pending_term_acks);
-    pending_term_acks--;
+    zmq_assert (false);
 }
 
-void zmq::socket_base_t::process_seqnum ()
+void zmq::socket_base_t::timer_event (int id_)
 {
-    processed_seqnum++;
+    zmq_assert (false);
 }
 
+void zmq::socket_base_t::check_destroy ()
+{
+    //  If the object was already marked as destroyed, finish the deallocation.
+    if (destroyed) {
+
+        //  Remove the socket from the reaper's poller.
+        poller->rm_fd (handle);
+
+        //  Remove the socket from the context.
+        destroy_socket (this);
+
+        //  Notify the reaper about the fact.
+        send_reaped ();
+
+        //  Deallocate.
+        own_t::process_destroy ();
+    }
+}
diff --git a/src/socket_base.hpp b/src/socket_base.hpp
index 3d95cec..15ac83c 100644
--- a/src/socket_base.hpp
+++ b/src/socket_base.hpp
@@ -1,50 +1,65 @@
 /*
-    Copyright (c) 2007-2010 iMatix Corporation
+    Copyright (c) 2007-2011 iMatix Corporation
+    Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
 
     This file is part of 0MQ.
 
     0MQ is free software; you can redistribute it and/or modify it under
-    the terms of the Lesser GNU General Public License as published by
+    the terms of the GNU Lesser General Public License as published by
     the Free Software Foundation; either version 3 of the License, or
     (at your option) any later version.
 
     0MQ is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    Lesser GNU General Public License for more details.
+    GNU Lesser General Public License for more details.
 
-    You should have received a copy of the Lesser GNU General Public License
+    You should have received a copy of the GNU Lesser General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
 #ifndef __ZMQ_SOCKET_BASE_HPP_INCLUDED__
 #define __ZMQ_SOCKET_BASE_HPP_INCLUDED__
 
-#include <set>
 #include <map>
 #include <vector>
 
 #include "../include/zmq.h"
 
-#include "i_endpoint.hpp"
-#include "object.hpp"
-#include "yarray_item.hpp"
+#include "own.hpp"
+#include "array.hpp"
 #include "mutex.hpp"
-#include "options.hpp"
 #include "stdint.hpp"
+#include "poller.hpp"
 #include "atomic_counter.hpp"
+#include "i_poll_events.hpp"
+#include "mailbox.hpp"
 #include "stdint.hpp"
 #include "blob.hpp"
+#include "own.hpp"
 
 namespace zmq
 {
 
     class socket_base_t :
-        public object_t, public i_endpoint, public yarray_item_t
+        public own_t,
+        public array_item_t,
+        public i_poll_events
     {
+        friend class reaper_t;
+
     public:
 
-        socket_base_t (class app_thread_t *parent_);
+        //  Create a socket of a specified type.
+        static socket_base_t *create (int type_, class ctx_t *parent_,
+            uint32_t tid_);
+
+        //  Returns the mailbox associated with this socket.
+        mailbox_t *get_mailbox ();
+
+        //  Interrupt blocking call if the socket is stuck in one.
+        //  This function can be called from a different thread!
+        void stop ();
 
         //  Interface for communication with the API layer.
         int setsockopt (int option_, const void *optval_, size_t optvallen_);
@@ -55,88 +70,113 @@ namespace zmq
         int recv (zmq_msg_t *msg_, int flags_);
         int close ();
 
-        //  When another owned object wants to send command to this object
-        //  it calls this function to let it know it should not shut down
-        //  before the command is delivered.
-        void inc_seqnum ();
-
-        //  This function is used by the polling mechanism to determine
-        //  whether the socket belongs to the application thread the poll
-        //  is called from.
-        class app_thread_t *get_thread ();
-
         //  These functions are used by the polling mechanism to determine
         //  which events are to be reported from this socket.
         bool has_in ();
         bool has_out ();
 
-        //  The list of sessions cannot be accessed via inter-thread
-        //  commands as it is unacceptable to wait for the completion of the
-        //  action till user application yields control of the application
-        //  thread to 0MQ. Locking is used instead.
-        //  There are two distinct types of sessions: those identified by name
-        //  and those identified by ordinal number. Thus two sets of session
-        //  management functions.
-        bool register_session (const blob_t &peer_identity_,
-            class session_t *session_);
-        void unregister_session (const blob_t &peer_identity_);
-        class session_t *find_session (const blob_t &peer_identity_);
-        uint64_t register_session (class session_t *session_);
-        void unregister_session (uint64_t ordinal_);
-        class session_t *find_session (uint64_t ordinal_);
-
-        //  i_endpoint interface implementation.
-        void attach_pipes (class reader_t *inpipe_, class writer_t *outpipe_,
-            const blob_t &peer_identity_);
-        void detach_inpipe (class reader_t *pipe_);
-        void detach_outpipe (class writer_t *pipe_);
-        void kill (class reader_t *pipe_);
-        void revive (class reader_t *pipe_);
-        void revive (class writer_t *pipe_);
+        //  Registry of named sessions.
+        bool register_session (const blob_t &name_, class session_t *session_);
+        void unregister_session (const blob_t &name_);
+        class session_t *find_session (const blob_t &name_);
+
+        //  i_reader_events interface implementation.
+        void activated (class reader_t *pipe_);
+        void terminated (class reader_t *pipe_);
+
+        //  i_writer_events interface implementation.
+        void activated (class writer_t *pipe_);
+        void terminated (class writer_t *pipe_);
+
+        //  Using this function reaper thread ask the socket to regiter with
+        //  its poller.
+        void start_reaping (poller_t *poller_);
+
+        //  i_poll_events implementation. This interface is used when socket
+        //  is handled by the poller in the reaper thread.
+        void in_event ();
+        void out_event ();
+        void timer_event (int id_);
+
+        //  To be called after processing commands or invoking any command
+        //  handlers explicitly. If required, it will deallocate the socket.
+        void check_destroy ();
 
     protected:
 
-        //  Destructor is protected. Socket is closed using 'close' function.
+        socket_base_t (class ctx_t *parent_, uint32_t tid_);
         virtual ~socket_base_t ();
 
-        //  Pipe management is done by individual socket types.
+        //  Concrete algorithms for the x- methods are to be defined by
+        //  individual socket types.
         virtual void xattach_pipes (class reader_t *inpipe_,
             class writer_t *outpipe_, const blob_t &peer_identity_) = 0;
-        virtual void xdetach_inpipe (class reader_t *pipe_) = 0;
-        virtual void xdetach_outpipe (class writer_t *pipe_) = 0;
-        virtual void xkill (class reader_t *pipe_) = 0;
-        virtual void xrevive (class reader_t *pipe_) = 0;
-        virtual void xrevive (class writer_t *pipe_) = 0;
 
-        //  Actual algorithms are to be defined by individual socket types.
+        //  The default implementation assumes there are no specific socket
+        //  options for the particular socket type. If not so, overload this
+        //  method.
         virtual int xsetsockopt (int option_, const void *optval_,
-            size_t optvallen_) = 0;
-        virtual int xsend (zmq_msg_t *msg_, int options_) = 0;
-        virtual int xrecv (zmq_msg_t *msg_, int options_) = 0;
-        virtual bool xhas_in () = 0;
-        virtual bool xhas_out () = 0;
+            size_t optvallen_);
+
+        //  The default implementation assumes that send is not supported.
+        virtual bool xhas_out ();
+        virtual int xsend (zmq_msg_t *msg_, int options_);
+
+        //  The default implementation assumes that recv in not supported.
+        virtual bool xhas_in ();
+        virtual int xrecv (zmq_msg_t *msg_, int options_);
 
-        //  Socket options.
-        options_t options;
+        //  We are declaring termination handler as protected so that
+        //  individual socket types can hook into the termination process
+        //  by overloading it.
+        void process_term (int linger_);
+
+        //  Delay actual destruction of the socket.
+        void process_destroy ();
 
     private:
 
+        //  If true, associated context was already terminated.
+        bool ctx_terminated;
+
+        //  If true, object should have been already destroyed. However,
+        //  destruction is delayed while we unwind the stack to the point
+        //  where it doesn't intersect the object being destroyed.
+        bool destroyed;
+
+        //  Parse URI string.
+        int parse_uri (const char *uri_, std::string &protocol_,
+            std::string &address_);
+
+        //  Check whether transport protocol, as specified in connect or
+        //  bind, is available and compatible with the socket type.
+        int check_protocol (const std::string &protocol_);
+
+        //  If no identity set generate one and call xattach_pipes ().
+        void attach_pipes (class reader_t *inpipe_, class writer_t *outpipe_,
+            const blob_t &peer_identity_);
+
+        //  Processes commands sent to this socket (if any). If 'block' is
+        //  set to true, returns only after at least one command was processed.
+        //  If throttle argument is true, commands are processed at most once
+        //  in a predefined time period.
+        int process_commands (bool block_, bool throttle_);
+
         //  Handlers for incoming commands.
-        void process_own (class owned_t *object_);
+        void process_stop ();
         void process_bind (class reader_t *in_pipe_, class writer_t *out_pipe_,
             const blob_t &peer_identity_);
-        void process_term_req (class owned_t *object_);
-        void process_term_ack ();
-        void process_seqnum ();
+        void process_unplug ();
 
-        //  List of all I/O objects owned by this socket. The socket is
-        //  responsible for deallocating them before it quits.
-        typedef std::set <class owned_t*> io_objects_t;
-        io_objects_t io_objects;
+        //  Socket's mailbox object.
+        mailbox_t mailbox;
 
-        //  Number of I/O objects that were already asked to terminate
-        //  but haven't acknowledged it yet.
-        int pending_term_acks;
+        //  Reaper's poller and handle of this socket within it.
+        poller_t *poller;
+        poller_t::handle_t handle;
+
+        //  Timestamp of when commands were processed the last time.
+        uint64_t last_tsc;
 
         //  Number of messages received since last command processing.
         int ticks;
@@ -144,32 +184,16 @@ namespace zmq
         //  If true there's a half-read message in the socket.
         bool rcvmore;
 
-        //  Application thread the socket lives in.
-        class app_thread_t *app_thread;
-
-        //  If true, socket is already shutting down. No new work should be
-        //  started.
-        bool shutting_down;
-
-        //  Sequence number of the last command sent to this object.
-        atomic_counter_t sent_seqnum;
-
-        //  Sequence number of the last command processed by this object.
-        uint64_t processed_seqnum;
-
-        //  Lists of existing sessions. This lists are never referenced from
-        //  within the socket, instead they are used by I/O objects owned by
+        //  Lists of existing sessions. This list is never referenced from
+        //  within the socket, instead it is used by objects owned by
         //  the socket. As those objects can live in different threads,
         //  the access is synchronised by mutex.
-        typedef std::map <blob_t, session_t*> named_sessions_t;
-        named_sessions_t named_sessions;
-        typedef std::map <uint64_t, session_t*> unnamed_sessions_t;
-        unnamed_sessions_t unnamed_sessions;
-        uint64_t next_ordinal;
+        typedef std::map <blob_t, session_t*> sessions_t;
+        sessions_t sessions;
         mutex_t sessions_sync;
 
         socket_base_t (const socket_base_t&);
-        void operator = (const socket_base_t&);
+        const socket_base_t &operator = (const socket_base_t&);
     };
 
 }
diff --git a/src/stdint.hpp b/src/stdint.hpp
index fe1bff6..73186d3 100644
--- a/src/stdint.hpp
+++ b/src/stdint.hpp
@@ -1,19 +1,20 @@
 /*
-    Copyright (c) 2007-2010 iMatix Corporation
+    Copyright (c) 2007-2011 iMatix Corporation
+    Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
 
     This file is part of 0MQ.
 
     0MQ is free software; you can redistribute it and/or modify it under
-    the terms of the Lesser GNU General Public License as published by
+    the terms of the GNU Lesser General Public License as published by
     the Free Software Foundation; either version 3 of the License, or
     (at your option) any later version.
 
     0MQ is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    Lesser GNU General Public License for more details.
+    GNU Lesser General Public License for more details.
 
-    You should have received a copy of the Lesser GNU General Public License
+    You should have received a copy of the GNU Lesser General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
@@ -22,7 +23,7 @@
 
 #include "platform.hpp"
 
-#ifdef ZMQ_HAVE_SOLARIS
+#if defined ZMQ_HAVE_SOLARIS || defined ZMQ_HAVE_OPENVMS
 
 #include <inttypes.h>
 
@@ -53,14 +54,6 @@ typedef unsigned __int32 uint32_t;
 typedef unsigned __int64 uint64_t;
 #endif
 
-#elif defined ZMQ_HAVE_OPENVMS
-
-#include <types.h>
-typedef unsigned __int8 uint8_t;
-typedef unsigned __int16 uint16_t;
-typedef unsigned __int32 uint32_t;
-typedef unsigned __int64 uint64_t;
-
 #else
 
 #include <stdint.h>
diff --git a/src/streamer.cpp b/src/streamer.cpp
deleted file mode 100644
index 7c03365..0000000
--- a/src/streamer.cpp
+++ /dev/null
@@ -1,60 +0,0 @@
-/*
-    Copyright (c) 2007-2010 iMatix Corporation
-
-    This file is part of 0MQ.
-
-    0MQ is free software; you can redistribute it and/or modify it under
-    the terms of the Lesser GNU General Public License as published by
-    the Free Software Foundation; either version 3 of the License, or
-    (at your option) any later version.
-
-    0MQ is distributed in the hope that it will be useful,
-    but WITHOUT ANY WARRANTY; without even the implied warranty of
-    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    Lesser GNU General Public License for more details.
-
-    You should have received a copy of the Lesser GNU General Public License
-    along with this program.  If not, see <http://www.gnu.org/licenses/>.
-*/
-
-#include "../include/zmq.h"
-
-#include "streamer.hpp"
-#include "socket_base.hpp"
-#include "likely.hpp"
-#include "err.hpp"
-
-int zmq::streamer (socket_base_t *insocket_, socket_base_t *outsocket_)
-{
-    zmq_msg_t msg;
-    int rc = zmq_msg_init (&msg);
-    errno_assert (rc == 0);
-
-    int64_t more;
-    size_t more_sz = sizeof (more);
-
-    while (true) {
-        rc = insocket_->recv (&msg, 0);
-        if (unlikely (rc < 0)) {
-            if (errno == ETERM)
-                return -1;
-            errno_assert (false);
-        }
-       
-        rc = insocket_->getsockopt (ZMQ_RCVMORE, &more, &more_sz);
-        if (unlikely (rc < 0)) {
-            if (errno == ETERM)
-                return -1;
-            errno_assert (false);
-        }
-
-        rc = outsocket_->send (&msg, more ? ZMQ_SNDMORE : 0);
-        if (unlikely (rc < 0)) {
-            if (errno == ETERM)
-                return -1;
-            errno_assert (false);
-        }
-    }
-
-    return 0;
-}
diff --git a/src/sub.cpp b/src/sub.cpp
index eeb50cd..aef7369 100644
--- a/src/sub.cpp
+++ b/src/sub.cpp
@@ -1,191 +1,75 @@
 /*
-    Copyright (c) 2007-2010 iMatix Corporation
+    Copyright (c) 2007-2011 iMatix Corporation
+    Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
 
     This file is part of 0MQ.
 
     0MQ is free software; you can redistribute it and/or modify it under
-    the terms of the Lesser GNU General Public License as published by
+    the terms of the GNU Lesser General Public License as published by
     the Free Software Foundation; either version 3 of the License, or
     (at your option) any later version.
 
     0MQ is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    Lesser GNU General Public License for more details.
+    GNU Lesser General Public License for more details.
 
-    You should have received a copy of the Lesser GNU General Public License
+    You should have received a copy of the GNU Lesser General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
-#include <string.h>
-
 #include "../include/zmq.h"
 
 #include "sub.hpp"
-#include "err.hpp"
 
-zmq::sub_t::sub_t (class app_thread_t *parent_) :
-    socket_base_t (parent_),
-    has_message (false),
-    more (false)
+zmq::sub_t::sub_t (class ctx_t *parent_, uint32_t tid_) :
+    xsub_t (parent_, tid_)
 {
-    options.requires_in = true;
-    options.requires_out = false;
-    zmq_msg_init (&message);
+    options.type = ZMQ_SUB;
 }
 
 zmq::sub_t::~sub_t ()
 {
-    zmq_msg_close (&message);
-}
-
-void zmq::sub_t::xattach_pipes (class reader_t *inpipe_,
-    class writer_t *outpipe_, const blob_t &peer_identity_)
-{
-    zmq_assert (inpipe_ && !outpipe_);
-    fq.attach (inpipe_);
-}
-
-void zmq::sub_t::xdetach_inpipe (class reader_t *pipe_)
-{
-    zmq_assert (pipe_);
-    fq.detach (pipe_);
-}
-
-void zmq::sub_t::xdetach_outpipe (class writer_t *pipe_)
-{
-    //  SUB socket is read-only thus there should be no outpipes.
-    zmq_assert (false);
-}
-
-void zmq::sub_t::xkill (class reader_t *pipe_)
-{
-    fq.kill (pipe_);
-}
-
-void zmq::sub_t::xrevive (class reader_t *pipe_)
-{
-    fq.revive (pipe_);
-}
-
-void zmq::sub_t::xrevive (class writer_t *pipe_)
-{
-    zmq_assert (false);
 }
 
 int zmq::sub_t::xsetsockopt (int option_, const void *optval_,
     size_t optvallen_)
 {
-    if (option_ == ZMQ_SUBSCRIBE) {
-        subscriptions.add ((unsigned char*) optval_, optvallen_);
-        return 0;
-    }
-    
-    if (option_ == ZMQ_UNSUBSCRIBE) {
-        if (!subscriptions.rm ((unsigned char*) optval_, optvallen_)) {
-            errno = EINVAL;
-            return -1;
-        }
-        return 0;
+    if (option_ != ZMQ_SUBSCRIBE && option_ != ZMQ_UNSUBSCRIBE) {
+        errno = EINVAL;
+        return -1;
     }
 
-    errno = EINVAL;
-    return -1;
+    //  Create the subscription message.
+    zmq_msg_t msg;
+    zmq_msg_init_size (&msg, optvallen_ + 1);
+    unsigned char *data = (unsigned char*) zmq_msg_data (&msg);
+    if (option_ == ZMQ_SUBSCRIBE)
+        *data = 1;
+    else if (option_ == ZMQ_UNSUBSCRIBE)
+        *data = 0;
+    memcpy (data + 1, optval_, optvallen_);
+
+    //  Pass it further on in the stack.
+    int err = 0;
+    int rc = xsub_t::xsend (&msg, 0);
+    if (rc != 0)
+        err = errno;
+    zmq_msg_close (&msg);
+    if (rc != 0)
+        errno = err;
+    return rc;
 }
 
-int zmq::sub_t::xsend (zmq_msg_t *msg_, int flags_)
+int zmq::sub_t::xsend (zmq_msg_t *msg_, int options_)
 {
+    //  Overload the XSUB's send.
     errno = ENOTSUP;
     return -1;
 }
 
-int zmq::sub_t::xrecv (zmq_msg_t *msg_, int flags_)
-{
-    //  If there's already a message prepared by a previous call to zmq_poll,
-    //  return it straight ahead.
-    if (has_message) {
-        zmq_msg_move (msg_, &message);
-        has_message = false;
-        more = msg_->flags & ZMQ_MSG_MORE;
-        return 0;
-    }
-
-    //  TODO: This can result in infinite loop in the case of continuous
-    //  stream of non-matching messages which breaks the non-blocking recv
-    //  semantics.
-    while (true) {
-
-        //  Get a message using fair queueing algorithm.
-        int rc = fq.recv (msg_, flags_);
-
-        //  If there's no message available, return immediately.
-        //  The same when error occurs.
-        if (rc != 0)
-            return -1;
-
-        //  Check whether the message matches at least one subscription.
-        //  Non-initial parts of the message are passed 
-        if (more || match (msg_)) {
-            more = msg_->flags & ZMQ_MSG_MORE;
-            return 0;
-        }
-
-        //  Message doesn't match. Pop any remaining parts of the message
-        //  from the pipe.
-        while (msg_->flags & ZMQ_MSG_MORE) {
-            rc = fq.recv (msg_, ZMQ_NOBLOCK);
-            zmq_assert (rc == 0);
-        }
-    }
-}
-
-bool zmq::sub_t::xhas_in ()
-{
-    //  There are subsequent parts of the partly-read message available.
-    if (more)
-        return true;
-
-    //  If there's already a message prepared by a previous call to zmq_poll,
-    //  return straight ahead.
-    if (has_message)
-        return true;
-
-    //  TODO: This can result in infinite loop in the case of continuous
-    //  stream of non-matching messages.
-    while (true) {
-
-        //  Get a message using fair queueing algorithm.
-        int rc = fq.recv (&message, ZMQ_NOBLOCK);
-
-        //  If there's no message available, return immediately.
-        //  The same when error occurs.
-        if (rc != 0) {
-            zmq_assert (errno == EAGAIN);
-            return false;
-        }
-
-        //  Check whether the message matches at least one subscription.
-        if (match (&message)) {
-            has_message = true;
-            return true;
-        }
-
-        //  Message doesn't match. Pop any remaining parts of the message
-        //  from the pipe.
-        while (message.flags & ZMQ_MSG_MORE) {
-            rc = fq.recv (&message, ZMQ_NOBLOCK);
-            zmq_assert (rc == 0);
-        }
-    }
-}
-
 bool zmq::sub_t::xhas_out ()
 {
+    //  Overload the XSUB's send.
     return false;
 }
-
-bool zmq::sub_t::match (zmq_msg_t *msg_)
-{
-    return subscriptions.check ((unsigned char*) zmq_msg_data (msg_),
-        zmq_msg_size (msg_));
-}
diff --git a/src/sub.hpp b/src/sub.hpp
index 7b997c9..d1f467d 100644
--- a/src/sub.hpp
+++ b/src/sub.hpp
@@ -1,79 +1,48 @@
 /*
-    Copyright (c) 2007-2010 iMatix Corporation
+    Copyright (c) 2007-2011 iMatix Corporation
+    Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
 
     This file is part of 0MQ.
 
     0MQ is free software; you can redistribute it and/or modify it under
-    the terms of the Lesser GNU General Public License as published by
+    the terms of the GNU Lesser General Public License as published by
     the Free Software Foundation; either version 3 of the License, or
     (at your option) any later version.
 
     0MQ is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    Lesser GNU General Public License for more details.
+    GNU Lesser General Public License for more details.
 
-    You should have received a copy of the Lesser GNU General Public License
+    You should have received a copy of the GNU Lesser General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
 #ifndef __ZMQ_SUB_HPP_INCLUDED__
 #define __ZMQ_SUB_HPP_INCLUDED__
 
-#include "../include/zmq.h"
-
-#include "prefix_tree.hpp"
-#include "socket_base.hpp"
-#include "fq.hpp"
+#include "xsub.hpp"
 
 namespace zmq
 {
 
-    class sub_t : public socket_base_t
+    class sub_t : public xsub_t
     {
     public:
 
-        sub_t (class app_thread_t *parent_);
+        sub_t (class ctx_t *parent_, uint32_t tid_);
         ~sub_t ();
 
     protected:
 
-        //  Overloads of functions from socket_base_t.
-        void xattach_pipes (class reader_t *inpipe_, class writer_t *outpipe_,
-            const blob_t &peer_identity_);
-        void xdetach_inpipe (class reader_t *pipe_);
-        void xdetach_outpipe (class writer_t *pipe_);
-        void xkill (class reader_t *pipe_);
-        void xrevive (class reader_t *pipe_);
-        void xrevive (class writer_t *pipe_);
         int xsetsockopt (int option_, const void *optval_, size_t optvallen_);
-        int xsend (zmq_msg_t *msg_, int flags_);
-        int xrecv (zmq_msg_t *msg_, int flags_);
-        bool xhas_in ();
-        bool xhas_out ();
+        int xsend (zmq_msg_t *msg_, int options_);
+	bool xhas_out ();
 
     private:
 
-        //  Check whether the message matches at least one subscription.
-        bool match (zmq_msg_t *msg_);
-
-        //  Fair queueing object for inbound pipes.
-        fq_t fq;
-
-        //  The repository of subscriptions.
-        prefix_tree_t subscriptions;
-
-        //  If true, 'message' contains a matching message to return on the
-        //  next recv call.
-        bool has_message;
-        zmq_msg_t message;
-
-        //  If true, part of a multipart message was already received, but
-        //  there are following parts still waiting.
-        bool more;
-
         sub_t (const sub_t&);
-        void operator = (const sub_t&);
+        const sub_t &operator = (const sub_t&);
     };
 
 }
diff --git a/src/msg_store.cpp b/src/swap.cpp
index aaf6dbe..936f30e 100644
--- a/src/msg_store.cpp
+++ b/src/swap.cpp
@@ -1,19 +1,20 @@
 /*
-    Copyright (c) 2007-2010 iMatix Corporation
+    Copyright (c) 2007-2011 iMatix Corporation
+    Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
 
     This file is part of 0MQ.
 
     0MQ is free software; you can redistribute it and/or modify it under
-    the terms of the Lesser GNU General Public License as published by
+    the terms of the GNU Lesser General Public License as published by
     the Free Software Foundation; either version 3 of the License, or
     (at your option) any later version.
 
     0MQ is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    Lesser GNU General Public License for more details.
+    GNU Lesser General Public License for more details.
 
-    You should have received a copy of the Lesser GNU General Public License
+    You should have received a copy of the GNU Lesser General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
@@ -35,32 +36,33 @@
 #include <sstream>
 #include <algorithm>
 
+#include "swap.hpp"
+#include "config.hpp"
 #include "atomic_counter.hpp"
-#include "msg_store.hpp"
 #include "err.hpp"
 
-zmq::msg_store_t::msg_store_t (int64_t filesize_, size_t block_size_) :
+zmq::swap_t::swap_t (int64_t filesize_) :
     fd (-1),
     filesize (filesize_),
     file_pos (0),
     write_pos (0),
     read_pos (0),
-    block_size (block_size_),
+    block_size (swap_block_size),
     write_buf_start_addr (0)
 {
     zmq_assert (filesize > 0);
     zmq_assert (block_size > 0);
 
     buf1 = new (std::nothrow) char [block_size];
-    zmq_assert (buf1);
+    alloc_assert (buf1);
 
     buf2 = new (std::nothrow) char [block_size];
-    zmq_assert (buf2);
+    alloc_assert (buf2);
 
     read_buf = write_buf = buf1;
 }
 
-zmq::msg_store_t::~msg_store_t ()
+zmq::swap_t::~swap_t ()
 {
     delete [] buf1;
     delete [] buf2;
@@ -83,7 +85,7 @@ zmq::msg_store_t::~msg_store_t ()
     errno_assert (rc == 0);
 }
 
-int zmq::msg_store_t::init ()
+int zmq::swap_t::init ()
 {
     static zmq::atomic_counter_t seqnum (0);
 
@@ -116,7 +118,7 @@ int zmq::msg_store_t::init ()
     return 0;
 }
 
-bool zmq::msg_store_t::store (zmq_msg_t *msg_)
+bool zmq::swap_t::store (zmq_msg_t *msg_)
 {
     size_t msg_size = zmq_msg_size (msg_);
 
@@ -138,7 +140,7 @@ bool zmq::msg_store_t::store (zmq_msg_t *msg_)
     return true;
 }
 
-void zmq::msg_store_t::fetch (zmq_msg_t *msg_)
+void zmq::swap_t::fetch (zmq_msg_t *msg_)
 {
     //  There must be at least one message available.
     zmq_assert (read_pos != write_pos);
@@ -157,12 +159,12 @@ void zmq::msg_store_t::fetch (zmq_msg_t *msg_)
     copy_from_file (zmq_msg_data (msg_), msg_size);
 }
 
-void zmq::msg_store_t::commit ()
+void zmq::swap_t::commit ()
 {
     commit_pos = write_pos;
 }
 
-void zmq::msg_store_t::rollback ()
+void zmq::swap_t::rollback ()
 {
     if (commit_pos == write_pos || read_pos == write_pos)
         return;
@@ -183,17 +185,30 @@ void zmq::msg_store_t::rollback ()
     write_pos = commit_pos;
 }
 
-bool zmq::msg_store_t::empty ()
+bool zmq::swap_t::empty ()
 {
     return read_pos == write_pos;
 }
 
-bool zmq::msg_store_t::full ()
+/*
+bool zmq::swap_t::full ()
 {
-    return buffer_space () == 1;
+    //  Check that at least the message size can be written to the swap.
+    return buffer_space () < (int64_t) (sizeof (size_t) + 1);
 }
+*/
+
+bool zmq::swap_t::fits (zmq_msg_t *msg_)
+{
+    //  Check whether whole binary representation of the message
+    //  fits into the swap.
+    size_t msg_size = zmq_msg_size (msg_);
+    if (buffer_space () <= (int64_t) (sizeof msg_size + 1 + msg_size))
+        return false;
+    return true;
+ }
 
-void zmq::msg_store_t::copy_from_file (void *buffer_, size_t count_)
+void zmq::swap_t::copy_from_file (void *buffer_, size_t count_)
 {
     char *dest_ptr = (char *) buffer_;
     size_t chunk_size, remainder = count_;
@@ -217,7 +232,7 @@ void zmq::msg_store_t::copy_from_file (void *buffer_, size_t count_)
     }
 }
 
-void zmq::msg_store_t::copy_to_file (const void *buffer_, size_t count_)
+void zmq::swap_t::copy_to_file (const void *buffer_, size_t count_)
 {
     char *source_ptr = (char *) buffer_;
     size_t chunk_size, remainder = count_;
@@ -246,7 +261,7 @@ void zmq::msg_store_t::copy_to_file (const void *buffer_, size_t count_)
     }
 }
 
-void zmq::msg_store_t::fill_buf (char *buf, int64_t pos)
+void zmq::swap_t::fill_buf (char *buf, int64_t pos)
 {
     if (file_pos != pos) {
 #ifdef ZMQ_HAVE_WINDOWS
@@ -264,7 +279,8 @@ void zmq::msg_store_t::fill_buf (char *buf, int64_t pos)
 #ifdef ZMQ_HAVE_WINDOWS
         int rc = _read (fd, &buf [octets_stored], octets_total - octets_stored);
 #else
-        ssize_t rc = read (fd, &buf [octets_stored], octets_total - octets_stored);
+        ssize_t rc = read (fd, &buf [octets_stored],
+            octets_total - octets_stored);
 #endif
         errno_assert (rc > 0);
         octets_stored += rc;
@@ -272,7 +288,7 @@ void zmq::msg_store_t::fill_buf (char *buf, int64_t pos)
     file_pos += octets_total;
 }
 
-void zmq::msg_store_t::save_write_buf ()
+void zmq::swap_t::save_write_buf ()
 {
     if (file_pos != write_buf_start_addr) {
 #ifdef ZMQ_HAVE_WINDOWS
@@ -288,9 +304,11 @@ void zmq::msg_store_t::save_write_buf ()
 
     while (octets_stored < octets_total) {
 #ifdef ZMQ_HAVE_WINDOWS
-        int rc = _write (fd, &write_buf [octets_stored], octets_total - octets_stored);
+        int rc = _write (fd, &write_buf [octets_stored],
+            octets_total - octets_stored);
 #else
-        ssize_t rc = write (fd, &write_buf [octets_stored], octets_total - octets_stored);
+        ssize_t rc = write (fd, &write_buf [octets_stored],
+            octets_total - octets_stored);
 #endif
         errno_assert (rc > 0);
         octets_stored += rc;
@@ -298,7 +316,7 @@ void zmq::msg_store_t::save_write_buf ()
     file_pos += octets_total;
 }
 
-int64_t zmq::msg_store_t::buffer_space ()
+int64_t zmq::swap_t::buffer_space ()
 {
     if (write_pos < read_pos)
         return read_pos - write_pos;
diff --git a/src/msg_store.hpp b/src/swap.hpp
index 765fc60..ad2bcc3 100644
--- a/src/msg_store.hpp
+++ b/src/swap.hpp
@@ -1,24 +1,25 @@
 /*
-    Copyright (c) 2007-2010 iMatix Corporation
+    Copyright (c) 2007-2011 iMatix Corporation
+    Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
 
     This file is part of 0MQ.
 
     0MQ is free software; you can redistribute it and/or modify it under
-    the terms of the Lesser GNU General Public License as published by
+    the terms of the GNU Lesser General Public License as published by
     the Free Software Foundation; either version 3 of the License, or
     (at your option) any later version.
 
     0MQ is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    Lesser GNU General Public License for more details.
+    GNU Lesser General Public License for more details.
 
-    You should have received a copy of the Lesser GNU General Public License
+    You should have received a copy of the GNU Lesser General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
-#ifndef __ZMQ_MSG_STORE_HPP_INCLUDED__
-#define __ZMQ_MSG_STORE_HPP_INCLUDED__
+#ifndef __ZMQ_SWAP_HPP_INCLUDED__
+#define __ZMQ_SWAP_HPP_INCLUDED__
 
 #include "../include/zmq.h"
 
@@ -28,39 +29,43 @@
 namespace zmq
 {
 
-    //  This class implements a message store. Messages are retrieved from
-    //  the store in the same order as they entered it.
+    //  This class implements a message swap. Messages are retrieved from
+    //  the swap in the same order as they entered it.
 
-    class msg_store_t
+    class swap_t
     {
     public:
 
         enum { default_block_size = 8192 };
 
-        //  Creates message store.
-        msg_store_t (int64_t filesize_, size_t block_size_ = default_block_size);
+        //  Creates the swap.
+        swap_t (int64_t filesize_);
 
-        ~msg_store_t ();
+        ~swap_t ();
 
         int init ();
 
-        //  Stores the message into the message store. The function
-        //  returns false if the message store is full; true otherwise.
+        //  Stores the message into the swap. The function
+        //  returns false if the swap is full; true otherwise.
         bool store (zmq_msg_t *msg_);
 
-        //  Fetches the oldest message from the message store. It is an error
-        //  to call this function when the message store is empty.
+        //  Fetches the oldest message from the swap. It is an error
+        //  to call this function when the swap is empty.
         void fetch (zmq_msg_t *msg_);
 
         void commit ();
 
         void rollback ();
 
-        //  Returns true if the message store is empty; false otherwise.
+        //  Returns true if the swap is empty; false otherwise.
         bool empty ();
 
-        //  Returns true if and only if the store is full.
-        bool full ();
+
+//        //  Returns true if and only if the swap is full.
+//        bool full ();
+
+        //  Returns true if the message fits into swap.
+        bool fits (zmq_msg_t *msg_);
 
     private:
 
@@ -107,6 +112,10 @@ namespace zmq
         char *write_buf;
 
         int64_t write_buf_start_addr;
+
+        //  Disable copying of the swap object.
+        swap_t (const swap_t&);
+        const swap_t &operator = (const swap_t&);
     };
 
 }
diff --git a/src/tcp_connecter.cpp b/src/tcp_connecter.cpp
index dee71be..0c1581d 100644
--- a/src/tcp_connecter.cpp
+++ b/src/tcp_connecter.cpp
@@ -1,19 +1,20 @@
 /*
-    Copyright (c) 2007-2010 iMatix Corporation
+    Copyright (c) 2007-2011 iMatix Corporation
+    Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
 
     This file is part of 0MQ.
 
     0MQ is free software; you can redistribute it and/or modify it under
-    the terms of the Lesser GNU General Public License as published by
+    the terms of the GNU Lesser General Public License as published by
     the Free Software Foundation; either version 3 of the License, or
     (at your option) any later version.
 
     0MQ is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    Lesser GNU General Public License for more details.
+    GNU Lesser General Public License for more details.
 
-    You should have received a copy of the Lesser GNU General Public License
+    You should have received a copy of the GNU Lesser General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
diff --git a/src/tcp_connecter.hpp b/src/tcp_connecter.hpp
index f1a124f..06641e5 100644
--- a/src/tcp_connecter.hpp
+++ b/src/tcp_connecter.hpp
@@ -1,19 +1,20 @@
 /*
-    Copyright (c) 2007-2010 iMatix Corporation
+    Copyright (c) 2007-2011 iMatix Corporation
+    Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
 
     This file is part of 0MQ.
 
     0MQ is free software; you can redistribute it and/or modify it under
-    the terms of the Lesser GNU General Public License as published by
+    the terms of the GNU Lesser General Public License as published by
     the Free Software Foundation; either version 3 of the License, or
     (at your option) any later version.
 
     0MQ is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    Lesser GNU General Public License for more details.
+    GNU Lesser General Public License for more details.
 
-    You should have received a copy of the Lesser GNU General Public License
+    You should have received a copy of the GNU Lesser General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
@@ -72,7 +73,7 @@ namespace zmq
         fd_t s;
 
         tcp_connecter_t (const tcp_connecter_t&);
-        void operator = (const tcp_connecter_t&);
+        const tcp_connecter_t &operator = (const tcp_connecter_t&);
     };
 
 }
diff --git a/src/tcp_listener.cpp b/src/tcp_listener.cpp
index a62bc04..205ddc1 100644
--- a/src/tcp_listener.cpp
+++ b/src/tcp_listener.cpp
@@ -1,19 +1,20 @@
 /*
-    Copyright (c) 2007-2010 iMatix Corporation
+    Copyright (c) 2007-2011 iMatix Corporation
+    Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
 
     This file is part of 0MQ.
 
     0MQ is free software; you can redistribute it and/or modify it under
-    the terms of the Lesser GNU General Public License as published by
+    the terms of the GNU Lesser General Public License as published by
     the Free Software Foundation; either version 3 of the License, or
     (at your option) any later version.
 
     0MQ is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    Lesser GNU General Public License for more details.
+    GNU Lesser General Public License for more details.
 
-    You should have received a copy of the Lesser GNU General Public License
+    You should have received a copy of the GNU Lesser General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
@@ -30,6 +31,7 @@
 #ifdef ZMQ_HAVE_WINDOWS
 
 zmq::tcp_listener_t::tcp_listener_t () :
+    has_file (false),
     s (retired_fd)
 {
     memset (&addr, 0, sizeof (addr));
@@ -42,7 +44,8 @@ zmq::tcp_listener_t::~tcp_listener_t ()
         close ();
 }
 
-int zmq::tcp_listener_t::set_address (const char *protocol_, const char *addr_)
+int zmq::tcp_listener_t::set_address (const char *protocol_, const char *addr_,
+    int backlog_)
 {
     //  IPC protocol is not supported on Windows platform.
     if (strcmp (protocol_, "tcp") != 0 ) {
@@ -81,7 +84,7 @@ int zmq::tcp_listener_t::set_address (const char *protocol_, const char *addr_)
     }
 
     //  Listen for incomming connections.
-    rc = listen (s, 1);
+    rc = listen (s, backlog_);
     if (rc == SOCKET_ERROR) {
         wsa_error_to_errno ();
         return -1;
@@ -150,6 +153,7 @@ zmq::fd_t zmq::tcp_listener_t::accept ()
 #endif
 
 zmq::tcp_listener_t::tcp_listener_t () :
+    has_file (false),
     s (retired_fd)
 {
     memset (&addr, 0, sizeof (addr));
@@ -161,7 +165,8 @@ zmq::tcp_listener_t::~tcp_listener_t ()
         close ();
 }
 
-int zmq::tcp_listener_t::set_address (const char *protocol_, const char *addr_)
+int zmq::tcp_listener_t::set_address (const char *protocol_, const char *addr_,
+    int backlog_)
 {
     if (strcmp (protocol_, "tcp") == 0 ) {
 
@@ -196,14 +201,20 @@ int zmq::tcp_listener_t::set_address (const char *protocol_, const char *addr_)
         //  Bind the socket to the network interface and port.
         rc = bind (s, (struct sockaddr*) &addr, addr_len);
         if (rc != 0) {
-            close ();
+            int err = errno;
+            if (close () != 0)
+                return -1;
+            errno = err;
             return -1;
         }
 
         //  Listen for incomming connections.
-        rc = listen (s, tcp_connection_backlog);
+        rc = listen (s, backlog_);
         if (rc != 0) {
-            close ();
+            int err = errno;
+            if (close () != 0)
+                return -1;
+            errno = err;
             return -1;
         }
 
@@ -234,16 +245,23 @@ int zmq::tcp_listener_t::set_address (const char *protocol_, const char *addr_)
         errno_assert (rc != -1);
 
         //  Bind the socket to the file path.
-        rc = bind (s, (struct sockaddr*) &addr, sizeof (sockaddr_un));
+        rc = bind (s, (struct sockaddr*) &addr, addr_len);
         if (rc != 0) {
-            close ();
+            int err = errno;
+            if (close () != 0)
+                return -1;
+            errno = err;
             return -1;
         }
+        has_file = true;
 
         //  Listen for incomming connections.
-        rc = listen (s, tcp_connection_backlog);
+        rc = listen (s, backlog_);
         if (rc != 0) {
-            close ();
+            int err = errno;
+            if (close () != 0)
+                return -1;
+            errno = err;
             return -1;
         }
 
@@ -268,7 +286,7 @@ int zmq::tcp_listener_t::close ()
     //  If there's an underlying UNIX domain socket, get rid of the file it
     //  is associated with.
     struct sockaddr_un *su = (struct sockaddr_un*) &addr;
-    if (AF_UNIX == su->sun_family) {
+    if (AF_UNIX == su->sun_family && has_file) {
         rc = ::unlink(su->sun_path);
         if (rc != 0)
             return -1;
diff --git a/src/tcp_listener.hpp b/src/tcp_listener.hpp
index 3b60719..27e3092 100644
--- a/src/tcp_listener.hpp
+++ b/src/tcp_listener.hpp
@@ -1,19 +1,20 @@
 /*
-    Copyright (c) 2007-2010 iMatix Corporation
+    Copyright (c) 2007-2011 iMatix Corporation
+    Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
 
     This file is part of 0MQ.
 
     0MQ is free software; you can redistribute it and/or modify it under
-    the terms of the Lesser GNU General Public License as published by
+    the terms of the GNU Lesser General Public License as published by
     the Free Software Foundation; either version 3 of the License, or
     (at your option) any later version.
 
     0MQ is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    Lesser GNU General Public License for more details.
+    GNU Lesser General Public License for more details.
 
-    You should have received a copy of the Lesser GNU General Public License
+    You should have received a copy of the GNU Lesser General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
@@ -36,7 +37,8 @@ namespace zmq
         ~tcp_listener_t ();
 
         //  Start listening on the interface.
-        int set_address (const char *protocol_, const char *addr_);
+        int set_address (const char *protocol_, const char *addr_,
+            int backlog_);
 
         //  Close the listening socket.
         int close ();
@@ -56,11 +58,14 @@ namespace zmq
         sockaddr_storage addr;
         socklen_t addr_len;
 
+        //  True, if the undelying file for UNIX domain socket exists.
+        bool has_file;
+
         //  Underlying socket.
         fd_t s;
 
         tcp_listener_t (const tcp_listener_t&);
-        void operator = (const tcp_listener_t&);
+        const tcp_listener_t &operator = (const tcp_listener_t&);
     };
 
 }
diff --git a/src/tcp_socket.cpp b/src/tcp_socket.cpp
index c83bba6..f1b1d19 100644
--- a/src/tcp_socket.cpp
+++ b/src/tcp_socket.cpp
@@ -1,19 +1,20 @@
 /*
-    Copyright (c) 2007-2010 iMatix Corporation
+    Copyright (c) 2007-2011 iMatix Corporation
+    Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
 
     This file is part of 0MQ.
 
     0MQ is free software; you can redistribute it and/or modify it under
-    the terms of the Lesser GNU General Public License as published by
+    the terms of the GNU Lesser General Public License as published by
     the Free Software Foundation; either version 3 of the License, or
     (at your option) any later version.
 
     0MQ is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    Lesser GNU General Public License for more details.
+    GNU Lesser General Public License for more details.
 
-    You should have received a copy of the Lesser GNU General Public License
+    You should have received a copy of the GNU Lesser General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
diff --git a/src/tcp_socket.hpp b/src/tcp_socket.hpp
index 3aae060..3cb5739 100644
--- a/src/tcp_socket.hpp
+++ b/src/tcp_socket.hpp
@@ -1,19 +1,20 @@
 /*
-    Copyright (c) 2007-2010 iMatix Corporation
+    Copyright (c) 2007-2011 iMatix Corporation
+    Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
 
     This file is part of 0MQ.
 
     0MQ is free software; you can redistribute it and/or modify it under
-    the terms of the Lesser GNU General Public License as published by
+    the terms of the GNU Lesser General Public License as published by
     the Free Software Foundation; either version 3 of the License, or
     (at your option) any later version.
 
     0MQ is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    Lesser GNU General Public License for more details.
+    GNU Lesser General Public License for more details.
 
-    You should have received a copy of the Lesser GNU General Public License
+    You should have received a copy of the GNU Lesser General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
@@ -63,7 +64,7 @@ namespace zmq
 
         //  Disable copy construction of tcp_socket.
         tcp_socket_t (const tcp_socket_t&);
-        void operator = (const tcp_socket_t&);
+        const tcp_socket_t &operator = (const tcp_socket_t&);
     };
 
 }
diff --git a/src/thread.cpp b/src/thread.cpp
index 602ca8b..12a72e2 100644
--- a/src/thread.cpp
+++ b/src/thread.cpp
@@ -1,19 +1,20 @@
 /*
-    Copyright (c) 2007-2010 iMatix Corporation
+    Copyright (c) 2007-2011 iMatix Corporation
+    Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
 
     This file is part of 0MQ.
 
     0MQ is free software; you can redistribute it and/or modify it under
-    the terms of the Lesser GNU General Public License as published by
+    the terms of the GNU Lesser General Public License as published by
     the Free Software Foundation; either version 3 of the License, or
     (at your option) any later version.
 
     0MQ is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    Lesser GNU General Public License for more details.
+    GNU Lesser General Public License for more details.
 
-    You should have received a copy of the Lesser GNU General Public License
+    You should have received a copy of the GNU Lesser General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
@@ -23,12 +24,22 @@
 
 #ifdef ZMQ_HAVE_WINDOWS
 
+extern "C"
+{
+    static unsigned int __stdcall thread_routine (void *arg_)
+    {
+        zmq::thread_t *self = (zmq::thread_t*) arg_;
+        self->tfn (self->arg);
+        return 0;
+    }
+}
+
 void zmq::thread_t::start (thread_fn *tfn_, void *arg_)
 {
     tfn = tfn_;
     arg =arg_;
     descriptor = (HANDLE) _beginthreadex (NULL, 0,
-        &zmq::thread_t::thread_routine, this, 0 , NULL);
+        &::thread_routine, this, 0 , NULL);
     win_assert (descriptor != NULL);    
 }
 
@@ -38,27 +49,30 @@ void zmq::thread_t::stop ()
     win_assert (rc != WAIT_FAILED);
 }
 
-zmq::thread_t::id_t zmq::thread_t::id ()
-{
-    return GetCurrentThreadId ();
-}
+#else
 
-bool zmq::thread_t::equal (id_t id1_, id_t id2_)
-{
-    return id1_ == id2_;
-}
+#include <signal.h>
 
-unsigned int __stdcall zmq::thread_t::thread_routine (void *arg_)
+extern "C"
 {
-    thread_t *self = (thread_t*) arg_;
-    self->tfn (self->arg);
-    return 0;
+    static void *thread_routine (void *arg_)
+    {
+    #if !defined ZMQ_HAVE_OPENVMS
+        //  Following code will guarantee more predictable latecnies as it'll
+        //  disallow any signal handling in the I/O thread.
+        sigset_t signal_set;
+        int rc = sigfillset (&signal_set);
+        errno_assert (rc == 0);
+        rc = pthread_sigmask (SIG_BLOCK, &signal_set, NULL);
+        errno_assert (rc == 0);
+    #endif
+
+        zmq::thread_t *self = (zmq::thread_t*) arg_;   
+        self->tfn (self->arg);
+        return NULL;
+    }
 }
 
-#else
-
-#include <signal.h>
-
 void zmq::thread_t::start (thread_fn *tfn_, void *arg_)
 {
     tfn = tfn_;
@@ -73,33 +87,6 @@ void zmq::thread_t::stop ()
     errno_assert (rc == 0);
 }
 
-zmq::thread_t::id_t zmq::thread_t::id ()
-{
-    return pthread_self ();
-}
-
-bool zmq::thread_t::equal (id_t id1_, id_t id2_)
-{
-    return pthread_equal (id1_, id2_) != 0;
-}
-
-void *zmq::thread_t::thread_routine (void *arg_)
-{
-#if !defined ZMQ_HAVE_OPENVMS
-    //  Following code will guarantee more predictable latecnies as it'll
-    //  disallow any signal handling in the I/O thread.
-    sigset_t signal_set;
-    int rc = sigfillset (&signal_set);
-    errno_assert (rc == 0);
-    rc = pthread_sigmask (SIG_BLOCK, &signal_set, NULL);
-    errno_assert (rc == 0);
-#endif
-
-    thread_t *self = (thread_t*) arg_;   
-    self->tfn (self->arg);
-    return NULL;
-}
-
 #endif
 
 
diff --git a/src/thread.hpp b/src/thread.hpp
index 432770c..f3f5f8d 100644
--- a/src/thread.hpp
+++ b/src/thread.hpp
@@ -1,19 +1,20 @@
 /*
-    Copyright (c) 2007-2010 iMatix Corporation
+    Copyright (c) 2007-2011 iMatix Corporation
+    Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
 
     This file is part of 0MQ.
 
     0MQ is free software; you can redistribute it and/or modify it under
-    the terms of the Lesser GNU General Public License as published by
+    the terms of the GNU Lesser General Public License as published by
     the Free Software Foundation; either version 3 of the License, or
     (at your option) any later version.
 
     0MQ is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    Lesser GNU General Public License for more details.
+    GNU Lesser General Public License for more details.
 
-    You should have received a copy of the Lesser GNU General Public License
+    You should have received a copy of the GNU Lesser General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
@@ -55,30 +56,21 @@ namespace zmq
         //  Waits for thread termination.
         void stop ();
 
-#ifdef ZMQ_HAVE_WINDOWS
-        typedef DWORD id_t;
-#else
-        typedef pthread_t id_t;
-#endif
-
-        static id_t id ();
-        static bool equal (id_t id1_, id_t id2_);
+        //  These are internal members. They should be private, however then
+        //  they would not be accessible from the main C routine of the thread.
+        thread_fn *tfn;
+        void *arg;
         
     private:
 
 #ifdef ZMQ_HAVE_WINDOWS
-        static unsigned int __stdcall thread_routine (void *arg_);
         HANDLE descriptor;
 #else
-        static void *thread_routine (void *arg_);
         pthread_t descriptor;
 #endif
 
-        thread_fn *tfn;
-        void *arg;
-
         thread_t (const thread_t&);
-        void operator = (const thread_t&);
+        const thread_t &operator = (const thread_t&);
     };
 
 }
diff --git a/src/transient_session.cpp b/src/transient_session.cpp
new file mode 100644
index 0000000..a08f541
--- /dev/null
+++ b/src/transient_session.cpp
@@ -0,0 +1,41 @@
+/*
+    Copyright (c) 2007-2011 iMatix Corporation
+    Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
+
+    This file is part of 0MQ.
+
+    0MQ is free software; you can redistribute it and/or modify it under
+    the terms of the GNU Lesser General Public License as published by
+    the Free Software Foundation; either version 3 of the License, or
+    (at your option) any later version.
+
+    0MQ is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU Lesser General Public License for more details.
+
+    You should have received a copy of the GNU Lesser General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "transient_session.hpp"
+
+zmq::transient_session_t::transient_session_t (class io_thread_t *io_thread_,
+      class socket_base_t *socket_, const options_t &options_) :
+    session_t (io_thread_, socket_, options_)
+{
+}
+
+zmq::transient_session_t::~transient_session_t ()
+{
+}
+
+void zmq::transient_session_t::attached (const blob_t &peer_identity_)
+{
+}
+
+void zmq::transient_session_t::detached ()
+{
+    //  There's no way to reestablish a transient session. Tear it down.
+    terminate ();
+}
diff --git a/src/transient_session.hpp b/src/transient_session.hpp
new file mode 100644
index 0000000..03f058d
--- /dev/null
+++ b/src/transient_session.hpp
@@ -0,0 +1,52 @@
+/*
+    Copyright (c) 2007-2011 iMatix Corporation
+    Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
+
+    This file is part of 0MQ.
+
+    0MQ is free software; you can redistribute it and/or modify it under
+    the terms of the GNU Lesser General Public License as published by
+    the Free Software Foundation; either version 3 of the License, or
+    (at your option) any later version.
+
+    0MQ is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU Lesser General Public License for more details.
+
+    You should have received a copy of the GNU Lesser General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef __ZMQ_TRANSIENT_SESSION_HPP_INCLUDED__
+#define __ZMQ_TRANSIENT_SESSION_HPP_INCLUDED__
+
+#include "session.hpp"
+
+namespace zmq
+{
+
+    //  Transient session is created by the listener when the connected peer
+    //  stays anonymous. Transient session is destroyed on disconnect.
+
+    class transient_session_t : public session_t
+    {
+    public:
+
+        transient_session_t (class io_thread_t *io_thread_,
+            class socket_base_t *socket_, const options_t &options_);
+        ~transient_session_t ();
+
+    private:
+
+        //  Handlers for events from session base class.
+        void attached (const blob_t &peer_identity_);
+        void detached ();
+
+        transient_session_t (const transient_session_t&);
+        const transient_session_t &operator = (const transient_session_t&);
+    };
+
+}
+
+#endif
diff --git a/src/prefix_tree.cpp b/src/trie.cpp
index 6d4f084..4198ff3 100644
--- a/src/prefix_tree.cpp
+++ b/src/trie.cpp
@@ -1,19 +1,20 @@
 /*
-    Copyright (c) 2007-2010 iMatix Corporation
+    Copyright (c) 2007-2011 iMatix Corporation
+    Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
 
     This file is part of 0MQ.
 
     0MQ is free software; you can redistribute it and/or modify it under
-    the terms of the Lesser GNU General Public License as published by
+    the terms of the GNU Lesser General Public License as published by
     the Free Software Foundation; either version 3 of the License, or
     (at your option) any later version.
 
     0MQ is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    Lesser GNU General Public License for more details.
+    GNU Lesser General Public License for more details.
 
-    You should have received a copy of the Lesser GNU General Public License
+    You should have received a copy of the GNU Lesser General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
@@ -28,16 +29,16 @@
 #endif
 
 #include "err.hpp"
-#include "prefix_tree.hpp"
+#include "trie.hpp"
 
-zmq::prefix_tree_t::prefix_tree_t () :
+zmq::trie_t::trie_t () :
     refcnt (0),
     min (0),
     count (0)
 {
 }
 
-zmq::prefix_tree_t::~prefix_tree_t ()
+zmq::trie_t::~trie_t ()
 {
     if (count == 1)
         delete next.node;
@@ -49,7 +50,7 @@ zmq::prefix_tree_t::~prefix_tree_t ()
     }
 }
 
-void zmq::prefix_tree_t::add (unsigned char *prefix_, size_t size_)
+void zmq::trie_t::add (unsigned char *prefix_, size_t size_)
 {
     //  We are at the node corresponding to the prefix. We are done.
     if (!size_) {
@@ -69,11 +70,11 @@ void zmq::prefix_tree_t::add (unsigned char *prefix_, size_t size_)
         }
         else if (count == 1) {
             unsigned char oldc = min;
-            prefix_tree_t *oldp = next.node;
+            trie_t *oldp = next.node;
             count = (min < c ? c - min : min - c) + 1;
-            next.table = (prefix_tree_t**)
-                malloc (sizeof (prefix_tree_t*) * count);
-            zmq_assert (next.table);
+            next.table = (trie_t**)
+                malloc (sizeof (trie_t*) * count);
+            alloc_assert (next.table);
             for (unsigned short i = 0; i != count; ++i)
                 next.table [i] = 0;
             min = std::min (min, c);
@@ -84,8 +85,8 @@ void zmq::prefix_tree_t::add (unsigned char *prefix_, size_t size_)
             //  The new character is above the current character range.
             unsigned short old_count = count;
             count = c - min + 1;
-            next.table = (prefix_tree_t**) realloc ((void*) next.table,
-                sizeof (prefix_tree_t*) * count);
+            next.table = (trie_t**) realloc ((void*) next.table,
+                sizeof (trie_t*) * count);
             zmq_assert (next.table);
             for (unsigned short i = old_count; i != count; i++)
                 next.table [i] = NULL;
@@ -95,11 +96,11 @@ void zmq::prefix_tree_t::add (unsigned char *prefix_, size_t size_)
             //  The new character is below the current character range.
             unsigned short old_count = count;
             count = (min + old_count) - c;
-            next.table = (prefix_tree_t**) realloc ((void*) next.table,
-                sizeof (prefix_tree_t*) * count);
+            next.table = (trie_t**) realloc ((void*) next.table,
+                sizeof (trie_t*) * count);
             zmq_assert (next.table);
             memmove (next.table + min - c, next.table,
-                old_count * sizeof (prefix_tree_t*));
+                old_count * sizeof (trie_t*));
             for (unsigned short i = 0; i != min - c; i++)
                 next.table [i] = NULL;
             min = c;
@@ -109,21 +110,21 @@ void zmq::prefix_tree_t::add (unsigned char *prefix_, size_t size_)
     //  If next node does not exist, create one.
     if (count == 1) {
         if (!next.node) {
-            next.node = new (std::nothrow) prefix_tree_t;
-            zmq_assert (next.node);
+            next.node = new (std::nothrow) trie_t;
+            alloc_assert (next.node);
         }
         next.node->add (prefix_ + 1, size_ - 1);
     }
     else {
         if (!next.table [c - min]) {
-            next.table [c - min] = new (std::nothrow) prefix_tree_t;
-            zmq_assert (next.table [c - min]);
+            next.table [c - min] = new (std::nothrow) trie_t;
+            alloc_assert (next.table [c - min]);
         }
         next.table [c - min]->add (prefix_ + 1, size_ - 1);
     }
 }
 
-bool zmq::prefix_tree_t::rm (unsigned char *prefix_, size_t size_)
+bool zmq::trie_t::rm (unsigned char *prefix_, size_t size_)
 {
      if (!size_) {
          if (!refcnt)
@@ -136,7 +137,7 @@ bool zmq::prefix_tree_t::rm (unsigned char *prefix_, size_t size_)
      if (!count || c < min || c >= min + count)
          return false;
 
-     prefix_tree_t *next_node =
+     trie_t *next_node =
          count == 1 ? next.node : next.table [c - min];
 
      if (!next_node)
@@ -145,11 +146,11 @@ bool zmq::prefix_tree_t::rm (unsigned char *prefix_, size_t size_)
      return next_node->rm (prefix_ + 1, size_ - 1);
 }
 
-bool zmq::prefix_tree_t::check (unsigned char *data_, size_t size_)
+bool zmq::trie_t::check (unsigned char *data_, size_t size_)
 {
     //  This function is on critical path. It deliberately doesn't use
     //  recursion to get a bit better performance.
-    prefix_tree_t *current = this;
+    trie_t *current = this;
     while (true) {
 
         //  We've found a corresponding subscription!
diff --git a/src/prefix_tree.hpp b/src/trie.hpp
index bf1c4b9..dbf1cb1 100644
--- a/src/prefix_tree.hpp
+++ b/src/trie.hpp
@@ -1,24 +1,25 @@
 /*
-    Copyright (c) 2007-2010 iMatix Corporation
+    Copyright (c) 2007-2011 iMatix Corporation
+    Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
 
     This file is part of 0MQ.
 
     0MQ is free software; you can redistribute it and/or modify it under
-    the terms of the Lesser GNU General Public License as published by
+    the terms of the GNU Lesser General Public License as published by
     the Free Software Foundation; either version 3 of the License, or
     (at your option) any later version.
 
     0MQ is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    Lesser GNU General Public License for more details.
+    GNU Lesser General Public License for more details.
 
-    You should have received a copy of the Lesser GNU General Public License
+    You should have received a copy of the GNU Lesser General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
-#ifndef __ZMQ_PREFIX_TREE_HPP_INCLUDED__
-#define __ZMQ_PREFIX_TREE_HPP_INCLUDED__
+#ifndef __ZMQ_TRIE_HPP_INCLUDED__
+#define __ZMQ_TRIE_HPP_INCLUDED__
 
 #include <stddef.h>
 
@@ -27,12 +28,12 @@
 namespace zmq
 {
 
-    class prefix_tree_t
+    class trie_t
     {
     public:
 
-        prefix_tree_t ();
-        ~prefix_tree_t ();
+        trie_t ();
+        ~trie_t ();
 
         void add (unsigned char *prefix_, size_t size_);
         bool rm (unsigned char *prefix_, size_t size_);
@@ -44,9 +45,12 @@ namespace zmq
         unsigned char min;
         unsigned short count;
         union {
-            class prefix_tree_t *node;
-            class prefix_tree_t **table;
+            class trie_t *node;
+            class trie_t **table;
         } next;
+
+        trie_t (const trie_t&);
+        const trie_t &operator = (const trie_t&);
     };
 
 }
diff --git a/src/uuid.cpp b/src/uuid.cpp
index a119be0..d8cc2e8 100644
--- a/src/uuid.cpp
+++ b/src/uuid.cpp
@@ -1,19 +1,20 @@
 /*
-    Copyright (c) 2007-2010 iMatix Corporation
+    Copyright (c) 2007-2011 iMatix Corporation
+    Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
 
     This file is part of 0MQ.
 
     0MQ is free software; you can redistribute it and/or modify it under
-    the terms of the Lesser GNU General Public License as published by
+    the terms of the GNU Lesser General Public License as published by
     the Free Software Foundation; either version 3 of the License, or
     (at your option) any later version.
 
     0MQ is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    Lesser GNU General Public License for more details.
+    GNU Lesser General Public License for more details.
 
-    You should have received a copy of the Lesser GNU General Public License
+    You should have received a copy of the GNU Lesser General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
@@ -29,13 +30,6 @@ zmq::uuid_t::uuid_t ()
     ret = UuidToString (&uuid, &string_buf);
     zmq_assert (ret == RPC_S_OK);
 
-	/*
-	HRESULT hr = CoCreateGUID (&uuid);
-	zmq_assert (hr == S_OK);
-	int rc = StringFromGUID2 (uuid, string_buf, 40);
-	zmq_assert (rc != 0);
-	*/
-
     create_blob ();
 }
 
diff --git a/src/uuid.hpp b/src/uuid.hpp
index a528baf..5eab6c8 100644
--- a/src/uuid.hpp
+++ b/src/uuid.hpp
@@ -1,19 +1,20 @@
 /*
-    Copyright (c) 2007-2010 iMatix Corporation
+    Copyright (c) 2007-2011 iMatix Corporation
+    Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
 
     This file is part of 0MQ.
 
     0MQ is free software; you can redistribute it and/or modify it under
-    the terms of the Lesser GNU General Public License as published by
+    the terms of the GNU Lesser General Public License as published by
     the Free Software Foundation; either version 3 of the License, or
     (at your option) any later version.
 
     0MQ is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    Lesser GNU General Public License for more details.
+    GNU Lesser General Public License for more details.
 
-    You should have received a copy of the Lesser GNU General Public License
+    You should have received a copy of the GNU Lesser General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
diff --git a/src/windows.hpp b/src/windows.hpp
index 8fc98b0..5133875 100644
--- a/src/windows.hpp
+++ b/src/windows.hpp
@@ -1,19 +1,20 @@
 /*
-    Copyright (c) 2007-2010 iMatix Corporation
+    Copyright (c) 2007-2011 iMatix Corporation
+    Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
 
     This file is part of 0MQ.
 
     0MQ is free software; you can redistribute it and/or modify it under
-    the terms of the Lesser GNU General Public License as published by
+    the terms of the GNU Lesser General Public License as published by
     the Free Software Foundation; either version 3 of the License, or
     (at your option) any later version.
 
     0MQ is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    Lesser GNU General Public License for more details.
+    GNU Lesser General Public License for more details.
 
-    You should have received a copy of the Lesser GNU General Public License
+    You should have received a copy of the GNU Lesser General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
diff --git a/src/wire.hpp b/src/wire.hpp
index 9534cf6..bc9dfe5 100644
--- a/src/wire.hpp
+++ b/src/wire.hpp
@@ -1,19 +1,20 @@
 /*
-    Copyright (c) 2007-2010 iMatix Corporation
+    Copyright (c) 2007-2011 iMatix Corporation
+    Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
 
     This file is part of 0MQ.
 
     0MQ is free software; you can redistribute it and/or modify it under
-    the terms of the Lesser GNU General Public License as published by
+    the terms of the GNU Lesser General Public License as published by
     the Free Software Foundation; either version 3 of the License, or
     (at your option) any later version.
 
     0MQ is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    Lesser GNU General Public License for more details.
+    GNU Lesser General Public License for more details.
 
-    You should have received a copy of the Lesser GNU General Public License
+    You should have received a copy of the GNU Lesser General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
diff --git a/src/xpub.cpp b/src/xpub.cpp
new file mode 100644
index 0000000..ed56183
--- /dev/null
+++ b/src/xpub.cpp
@@ -0,0 +1,76 @@
+/*
+    Copyright (c) 2007-2011 iMatix Corporation
+    Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
+
+    This file is part of 0MQ.
+
+    0MQ is free software; you can redistribute it and/or modify it under
+    the terms of the GNU Lesser General Public License as published by
+    the Free Software Foundation; either version 3 of the License, or
+    (at your option) any later version.
+
+    0MQ is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU Lesser General Public License for more details.
+
+    You should have received a copy of the GNU Lesser General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "../include/zmq.h"
+
+#include "xpub.hpp"
+#include "err.hpp"
+#include "pipe.hpp"
+
+zmq::xpub_t::xpub_t (class ctx_t *parent_, uint32_t tid_) :
+    socket_base_t (parent_, tid_),
+    dist (this)
+{
+    options.type = ZMQ_XPUB;
+    options.requires_in = false;
+    options.requires_out = true;
+}
+
+zmq::xpub_t::~xpub_t ()
+{
+}
+
+void zmq::xpub_t::xattach_pipes (class reader_t *inpipe_,
+    class writer_t *outpipe_, const blob_t &peer_identity_)
+{
+    zmq_assert (!inpipe_ && outpipe_);
+    dist.attach (outpipe_);
+}
+
+void zmq::xpub_t::process_term (int linger_)
+{
+    //  Terminate the outbound pipes.
+    dist.terminate ();
+
+    //  Continue with the termination immediately.
+    socket_base_t::process_term (linger_);
+}
+
+int zmq::xpub_t::xsend (zmq_msg_t *msg_, int flags_)
+{
+    return dist.send (msg_, flags_);
+}
+
+bool zmq::xpub_t::xhas_out ()
+{
+    return dist.has_out ();
+}
+
+int zmq::xpub_t::xrecv (zmq_msg_t *msg_, int flags_)
+{
+    errno = EAGAIN;
+    return -1;
+}
+
+bool zmq::xpub_t::xhas_in ()
+{
+    return false;
+}
+
diff --git a/src/xpub.hpp b/src/xpub.hpp
new file mode 100644
index 0000000..e945198
--- /dev/null
+++ b/src/xpub.hpp
@@ -0,0 +1,61 @@
+/*
+    Copyright (c) 2007-2011 iMatix Corporation
+    Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
+
+    This file is part of 0MQ.
+
+    0MQ is free software; you can redistribute it and/or modify it under
+    the terms of the GNU Lesser General Public License as published by
+    the Free Software Foundation; either version 3 of the License, or
+    (at your option) any later version.
+
+    0MQ is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU Lesser General Public License for more details.
+
+    You should have received a copy of the GNU Lesser General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef __ZMQ_XPUB_HPP_INCLUDED__
+#define __ZMQ_XPUB_HPP_INCLUDED__
+
+#include "socket_base.hpp"
+#include "array.hpp"
+#include "pipe.hpp"
+#include "dist.hpp"
+
+namespace zmq
+{
+
+    class xpub_t : public socket_base_t
+    {
+    public:
+
+        xpub_t (class ctx_t *parent_, uint32_t tid_);
+        ~xpub_t ();
+
+        //  Implementations of virtual functions from socket_base_t.
+        void xattach_pipes (class reader_t *inpipe_, class writer_t *outpipe_,
+            const blob_t &peer_identity_);
+        int xsend (zmq_msg_t *msg_, int flags_);
+        bool xhas_out ();
+        int xrecv (zmq_msg_t *msg_, int flags_);
+        bool xhas_in ();
+
+    private:
+
+        //  Hook into the termination process.
+        void process_term (int linger_);
+
+        //  Distributor of messages holding the list of outbound pipes.
+        dist_t dist;
+
+        xpub_t (const xpub_t&);
+        const xpub_t &operator = (const xpub_t&);
+    };
+
+}
+
+#endif
diff --git a/src/xrep.cpp b/src/xrep.cpp
index f50e32e..7f0da4d 100644
--- a/src/xrep.cpp
+++ b/src/xrep.cpp
@@ -1,19 +1,20 @@
 /*
-    Copyright (c) 2007-2010 iMatix Corporation
+    Copyright (c) 2007-2011 iMatix Corporation
+    Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
 
     This file is part of 0MQ.
 
     0MQ is free software; you can redistribute it and/or modify it under
-    the terms of the Lesser GNU General Public License as published by
+    the terms of the GNU Lesser General Public License as published by
     the Free Software Foundation; either version 3 of the License, or
     (at your option) any later version.
 
     0MQ is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    Lesser GNU General Public License for more details.
+    GNU Lesser General Public License for more details.
 
-    You should have received a copy of the Lesser GNU General Public License
+    You should have received a copy of the GNU Lesser General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
@@ -23,14 +24,16 @@
 #include "err.hpp"
 #include "pipe.hpp"
 
-zmq::xrep_t::xrep_t (class app_thread_t *parent_) :
-    socket_base_t (parent_),
+zmq::xrep_t::xrep_t (class ctx_t *parent_, uint32_t tid_) :
+    socket_base_t (parent_, tid_),
     current_in (0),
     prefetched (false),
     more_in (false),
     current_out (NULL),
-    more_out (false)
+    more_out (false),
+    terminating (false)
 {
+    options.type = ZMQ_XREP;
     options.requires_in = true;
     options.requires_out = true;
 
@@ -41,42 +44,76 @@ zmq::xrep_t::xrep_t (class app_thread_t *parent_) :
 
 zmq::xrep_t::~xrep_t ()
 {
-    for (inpipes_t::iterator it = inpipes.begin (); it != inpipes.end (); it++)
-        it->reader->term ();
-    for (outpipes_t::iterator it = outpipes.begin (); it != outpipes.end ();
-          it++)
-        it->second.writer->term ();
+    zmq_assert (inpipes.empty ());
+    zmq_assert (outpipes.empty ());
+}
+
+void zmq::xrep_t::xattach_pipes (reader_t *inpipe_, writer_t *outpipe_,
+    const blob_t &peer_identity_)
+{
+    if (outpipe_) {
+
+        outpipe_->set_event_sink (this);
+
+        //  TODO: What if new connection has same peer identity as the old one?
+        outpipe_t outpipe = {outpipe_, true};
+        bool ok = outpipes.insert (outpipes_t::value_type (
+            peer_identity_, outpipe)).second;
+        zmq_assert (ok);
+
+        if (terminating) {
+            register_term_acks (1);
+            outpipe_->terminate ();        
+        }
+    }
+
+    if (inpipe_) {
+
+        inpipe_->set_event_sink (this);
+
+        inpipe_t inpipe = {inpipe_, peer_identity_, true};
+        inpipes.push_back (inpipe);
+
+        if (terminating) {
+            register_term_acks (1);
+            inpipe_->terminate ();
+        }
+    }
 }
 
-void zmq::xrep_t::xattach_pipes (class reader_t *inpipe_,
-    class writer_t *outpipe_, const blob_t &peer_identity_)
+void zmq::xrep_t::process_term (int linger_)
 {
-    zmq_assert (inpipe_ && outpipe_);
+    terminating = true;
 
-    //  TODO: What if new connection has same peer identity as the old one?
-    outpipe_t outpipe = {outpipe_, true};
-    bool ok = outpipes.insert (std::make_pair (
-        peer_identity_, outpipe)).second;
-    zmq_assert (ok);
+    register_term_acks (inpipes.size () + outpipes.size ());
 
-    inpipe_t inpipe = {inpipe_, peer_identity_, true};
-    inpipes.push_back (inpipe);
+    for (inpipes_t::iterator it = inpipes.begin (); it != inpipes.end ();
+          ++it)
+        it->reader->terminate ();
+    for (outpipes_t::iterator it = outpipes.begin (); it != outpipes.end ();
+          ++it)
+        it->second.writer->terminate ();
+
+    socket_base_t::process_term (linger_);
 }
 
-void zmq::xrep_t::xdetach_inpipe (class reader_t *pipe_)
+void zmq::xrep_t::terminated (reader_t *pipe_)
 {
-// TODO:!
     for (inpipes_t::iterator it = inpipes.begin (); it != inpipes.end ();
-          it++) {
+          ++it) {
         if (it->reader == pipe_) {
             inpipes.erase (it);
+            if (terminating)
+                unregister_term_ack ();
+            if (current_in >= inpipes.size ())
+                current_in = 0;
             return;
         }
     }
     zmq_assert (false);
 }
 
-void zmq::xrep_t::xdetach_outpipe (class writer_t *pipe_)
+void zmq::xrep_t::terminated (writer_t *pipe_)
 {
     for (outpipes_t::iterator it = outpipes.begin ();
           it != outpipes.end (); ++it) {
@@ -84,29 +121,22 @@ void zmq::xrep_t::xdetach_outpipe (class writer_t *pipe_)
             outpipes.erase (it);
             if (pipe_ == current_out)
                 current_out = NULL;
+            if (terminating)
+                unregister_term_ack ();
             return;
         }
     }
     zmq_assert (false);
 }
 
-void zmq::xrep_t::xkill (class reader_t *pipe_)
+void zmq::xrep_t::delimited (reader_t *pipe_)
 {
-    for (inpipes_t::iterator it = inpipes.begin (); it != inpipes.end ();
-          it++) {
-        if (it->reader == pipe_) {
-            zmq_assert (it->active);
-            it->active = false;
-            return;
-        }
-    }
-    zmq_assert (false);
 }
 
-void zmq::xrep_t::xrevive (class reader_t *pipe_)
+void zmq::xrep_t::activated (reader_t *pipe_)
 {
     for (inpipes_t::iterator it = inpipes.begin (); it != inpipes.end ();
-          it++) {
+          ++it) {
         if (it->reader == pipe_) {
             zmq_assert (!it->active);
             it->active = true;
@@ -116,7 +146,7 @@ void zmq::xrep_t::xrevive (class reader_t *pipe_)
     zmq_assert (false);
 }
 
-void zmq::xrep_t::xrevive (class writer_t *pipe_)
+void zmq::xrep_t::activated (writer_t *pipe_)
 {
     for (outpipes_t::iterator it = outpipes.begin ();
           it != outpipes.end (); ++it) {
@@ -129,13 +159,6 @@ void zmq::xrep_t::xrevive (class writer_t *pipe_)
     zmq_assert (false);
 }
 
-int zmq::xrep_t::xsetsockopt (int option_, const void *optval_,
-    size_t optvallen_)
-{
-    errno = EINVAL;
-    return -1;
-}
-
 int zmq::xrep_t::xsend (zmq_msg_t *msg_, int flags_)
 {
     //  If this is the first part of the message it's the identity of the
@@ -144,23 +167,40 @@ int zmq::xrep_t::xsend (zmq_msg_t *msg_, int flags_)
         zmq_assert (!current_out);
 
         //  If we have malformed message (prefix with no subsequent message)
-        //  then just silently drop the message.
-        if ((msg_->flags & ZMQ_MSG_MORE) == 0)
-            return 0;
+        //  then just silently ignore it.
+        if (msg_->flags & ZMQ_MSG_MORE) {
 
-        more_out = true;
+            more_out = true;
 
-        //  Find the pipe associated with the identity stored in the prefix.
-        //  If there's no such pipe just silently drop the message.
-        blob_t identity ((unsigned char*) zmq_msg_data (msg_),
-            zmq_msg_size (msg_));
-        outpipes_t::iterator it = outpipes.find (identity);
-        if (it == outpipes.end ())
-            return 0;
-
-        //  Remember the outgoing pipe.
-        current_out = it->second.writer;
+            //  Find the pipe associated with the identity stored in the prefix.
+            //  If there's no such pipe just silently ignore the message.
+            blob_t identity ((unsigned char*) zmq_msg_data (msg_),
+                zmq_msg_size (msg_));
+            outpipes_t::iterator it = outpipes.find (identity);
+
+            if (it != outpipes.end ()) {
+                current_out = it->second.writer;
+                zmq_msg_t empty;
+                int rc = zmq_msg_init (&empty);
+                zmq_assert (rc == 0);
+                if (!current_out->check_write (&empty)) {
+                    it->second.active = false;
+                    more_out = false;
+                    current_out = NULL;
+                    rc = zmq_msg_close (&empty);
+                    zmq_assert (rc == 0);
+                    errno = EAGAIN;
+                    return -1;
+                }
+                rc = zmq_msg_close (&empty);
+                zmq_assert (rc == 0);
+            }
+        }
 
+        int rc = zmq_msg_close (msg_);
+        zmq_assert (rc == 0);
+        rc = zmq_msg_init (msg_);
+        zmq_assert (rc == 0);
         return 0;
     }
 
@@ -233,7 +273,9 @@ int zmq::xrep_t::xrecv (zmq_msg_t *msg_, int flags_)
             return 0;
         }
 
-        //  If me don't have a message, move to next pipe.
+        //  If me don't have a message, mark the pipe as passive and
+        //  move to next pipe.
+        inpipes [current_in].active = false;
         current_in++;
         if (current_in >= inpipes.size ())
             current_in = 0;
@@ -260,6 +302,10 @@ bool zmq::xrep_t::xhas_in ()
         if (inpipes [current_in].active &&
               inpipes [current_in].reader->check_read ())
             return true;
+
+        //  If me don't have a message, mark the pipe as passive and
+        //  move to next pipe.
+        inpipes [current_in].active = false;
         current_in++;
         if (current_in >= inpipes.size ())
             current_in = 0;
diff --git a/src/xrep.hpp b/src/xrep.hpp
index da1b3d8..d7fbe9f 100644
--- a/src/xrep.hpp
+++ b/src/xrep.hpp
@@ -1,19 +1,20 @@
 /*
-    Copyright (c) 2007-2010 iMatix Corporation
+    Copyright (c) 2007-2011 iMatix Corporation
+    Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
 
     This file is part of 0MQ.
 
     0MQ is free software; you can redistribute it and/or modify it under
-    the terms of the Lesser GNU General Public License as published by
+    the terms of the GNU Lesser General Public License as published by
     the Free Software Foundation; either version 3 of the License, or
     (at your option) any later version.
 
     0MQ is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    Lesser GNU General Public License for more details.
+    GNU Lesser General Public License for more details.
 
-    You should have received a copy of the Lesser GNU General Public License
+    You should have received a copy of the GNU Lesser General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
@@ -25,27 +26,25 @@
 
 #include "socket_base.hpp"
 #include "blob.hpp"
+#include "pipe.hpp"
 
 namespace zmq
 {
 
     //  TODO: This class uses O(n) scheduling. Rewrite it to use O(1) algorithm.
-    class xrep_t : public socket_base_t
+    class xrep_t :
+        public socket_base_t,
+        public i_reader_events,
+        public i_writer_events
     {
     public:
 
-        xrep_t (class app_thread_t *parent_);
+        xrep_t (class ctx_t *parent_, uint32_t tid_);
         ~xrep_t ();
 
         //  Overloads of functions from socket_base_t.
-        void xattach_pipes (class reader_t *inpipe_, class writer_t *outpipe_,
+        void xattach_pipes (reader_t *inpipe_, writer_t *outpipe_,
             const blob_t &peer_identity_);
-        void xdetach_inpipe (class reader_t *pipe_);
-        void xdetach_outpipe (class writer_t *pipe_);
-        void xkill (class reader_t *pipe_);
-        void xrevive (class reader_t *pipe_);
-        void xrevive (class writer_t *pipe_);
-        int xsetsockopt (int option_, const void *optval_, size_t optvallen_);
         int xsend (zmq_msg_t *msg_, int flags_);
         int xrecv (zmq_msg_t *msg_, int flags_);
         bool xhas_in ();
@@ -53,6 +52,18 @@ namespace zmq
 
     private:
 
+        //  Hook into the termination process.
+        void process_term (int linger_);
+
+        //  i_reader_events interface implementation.
+        void activated (reader_t *pipe_);
+        void terminated (reader_t *pipe_);
+        void delimited (reader_t *pipe_);
+
+        //  i_writer_events interface implementation.
+        void activated (writer_t *pipe_);
+        void terminated (writer_t *pipe_);
+
         struct inpipe_t
         {
             class reader_t *reader;
@@ -92,8 +103,11 @@ namespace zmq
         //  If true, more outgoing message parts are expected.
         bool more_out;
 
+        //  If true, termination process is already underway.
+        bool terminating;
+
         xrep_t (const xrep_t&);
-        void operator = (const xrep_t&);
+        const xrep_t &operator = (const xrep_t&);
     };
 
 }
diff --git a/src/xreq.cpp b/src/xreq.cpp
index 66e5cc3..96f1bba 100644
--- a/src/xreq.cpp
+++ b/src/xreq.cpp
@@ -1,19 +1,20 @@
 /*
-    Copyright (c) 2007-2010 iMatix Corporation
+    Copyright (c) 2007-2011 iMatix Corporation
+    Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
 
     This file is part of 0MQ.
 
     0MQ is free software; you can redistribute it and/or modify it under
-    the terms of the Lesser GNU General Public License as published by
+    the terms of the GNU Lesser General Public License as published by
     the Free Software Foundation; either version 3 of the License, or
     (at your option) any later version.
 
     0MQ is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    Lesser GNU General Public License for more details.
+    GNU Lesser General Public License for more details.
 
-    You should have received a copy of the Lesser GNU General Public License
+    You should have received a copy of the GNU Lesser General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
@@ -22,9 +23,12 @@
 #include "xreq.hpp"
 #include "err.hpp"
 
-zmq::xreq_t::xreq_t (class app_thread_t *parent_) :
-    socket_base_t (parent_)
+zmq::xreq_t::xreq_t (class ctx_t *parent_, uint32_t tid_) :
+    socket_base_t (parent_, tid_),
+    fq (this),
+    lb (this)
 {
+    options.type = ZMQ_XREQ;
     options.requires_in = true;
     options.requires_out = true;
 }
@@ -41,38 +45,11 @@ void zmq::xreq_t::xattach_pipes (class reader_t *inpipe_,
     lb.attach (outpipe_);
 }
 
-void zmq::xreq_t::xdetach_inpipe (class reader_t *pipe_)
+void zmq::xreq_t::process_term (int linger_)
 {
-    zmq_assert (pipe_);
-    fq.detach (pipe_);
-}
-
-void zmq::xreq_t::xdetach_outpipe (class writer_t *pipe_)
-{
-    zmq_assert (pipe_);
-    lb.detach (pipe_);
-}
-
-void zmq::xreq_t::xkill (class reader_t *pipe_)
-{
-    fq.kill (pipe_);
-}
-
-void zmq::xreq_t::xrevive (class reader_t *pipe_)
-{
-    fq.revive (pipe_);
-}
-
-void zmq::xreq_t::xrevive (class writer_t *pipe_)
-{
-    lb.revive (pipe_);
-}
-
-int zmq::xreq_t::xsetsockopt (int option_, const void *optval_,
-    size_t optvallen_)
-{
-    errno = EINVAL;
-    return -1;
+    fq.terminate ();
+    lb.terminate ();
+    socket_base_t::process_term (linger_);
 }
 
 int zmq::xreq_t::xsend (zmq_msg_t *msg_, int flags_)
diff --git a/src/xreq.hpp b/src/xreq.hpp
index 8ee0bb9..73af21f 100644
--- a/src/xreq.hpp
+++ b/src/xreq.hpp
@@ -1,19 +1,21 @@
 /*
-    Copyright (c) 2007-2010 iMatix Corporation
+    Copyright (c) 2007-2011 iMatix Corporation
+    Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
+
 
     This file is part of 0MQ.
 
     0MQ is free software; you can redistribute it and/or modify it under
-    the terms of the Lesser GNU General Public License as published by
+    the terms of the GNU Lesser General Public License as published by
     the Free Software Foundation; either version 3 of the License, or
     (at your option) any later version.
 
     0MQ is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    Lesser GNU General Public License for more details.
+    GNU Lesser General Public License for more details.
 
-    You should have received a copy of the Lesser GNU General Public License
+    You should have received a copy of the GNU Lesser General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
@@ -31,18 +33,14 @@ namespace zmq
     {
     public:
 
-        xreq_t (class app_thread_t *parent_);
+        xreq_t (class ctx_t *parent_, uint32_t tid_);
         ~xreq_t ();
 
+    protected:
+
         //  Overloads of functions from socket_base_t.
         void xattach_pipes (class reader_t *inpipe_, class writer_t *outpipe_,
             const blob_t &peer_identity_);
-        void xdetach_inpipe (class reader_t *pipe_);
-        void xdetach_outpipe (class writer_t *pipe_);
-        void xkill (class reader_t *pipe_);
-        void xrevive (class reader_t *pipe_);
-        void xrevive (class writer_t *pipe_);
-        int xsetsockopt (int option_, const void *optval_, size_t optvallen_);
         int xsend (zmq_msg_t *msg_, int flags_);
         int xrecv (zmq_msg_t *msg_, int flags_);
         bool xhas_in ();
@@ -50,13 +48,16 @@ namespace zmq
 
     private:
 
+        //  Hook into the termination process.
+        void process_term (int linger_);
+
         //  Messages are fair-queued from inbound pipes. And load-balanced to
         //  the outbound pipes.
         fq_t fq;
         lb_t lb;
 
         xreq_t (const xreq_t&);
-        void operator = (const xreq_t&);
+        const xreq_t &operator = (const xreq_t&);
     };
 
 }
diff --git a/src/xsub.cpp b/src/xsub.cpp
new file mode 100644
index 0000000..8c77925
--- /dev/null
+++ b/src/xsub.cpp
@@ -0,0 +1,172 @@
+/*
+    Copyright (c) 2007-2011 iMatix Corporation
+    Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
+
+    This file is part of 0MQ.
+
+    0MQ is free software; you can redistribute it and/or modify it under
+    the terms of the GNU Lesser General Public License as published by
+    the Free Software Foundation; either version 3 of the License, or
+    (at your option) any later version.
+
+    0MQ is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU Lesser General Public License for more details.
+
+    You should have received a copy of the GNU Lesser General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include <string.h>
+
+#include "../include/zmq.h"
+
+#include "xsub.hpp"
+#include "err.hpp"
+
+zmq::xsub_t::xsub_t (class ctx_t *parent_, uint32_t tid_) :
+    socket_base_t (parent_, tid_),
+    fq (this),
+    has_message (false),
+    more (false)
+{
+    options.type = ZMQ_XSUB;
+    options.requires_in = true;
+    options.requires_out = false;
+    zmq_msg_init (&message);
+}
+
+zmq::xsub_t::~xsub_t ()
+{
+    zmq_msg_close (&message);
+}
+
+void zmq::xsub_t::xattach_pipes (class reader_t *inpipe_,
+    class writer_t *outpipe_, const blob_t &peer_identity_)
+{
+    zmq_assert (inpipe_ && !outpipe_);
+    fq.attach (inpipe_);
+}
+
+void zmq::xsub_t::process_term (int linger_)
+{
+    fq.terminate ();
+    socket_base_t::process_term (linger_);
+}
+
+int zmq::xsub_t::xsend (zmq_msg_t *msg_, int options_)
+{
+    size_t size = zmq_msg_size (msg_);
+    unsigned char *data = (unsigned char*) zmq_msg_data (msg_);
+
+    //  Malformed subscriptions are dropped silently.
+    if (size >= 1) {
+
+        //  Process a subscription.
+        if (*data == 1)
+            subscriptions.add (data + 1, size - 1);
+
+        //  Process an unsubscription. Invalid unsubscription is ignored.
+        if (*data == 0)
+            subscriptions.rm (data + 1, size - 1);
+    }
+
+    int rc = zmq_msg_close (msg_);
+    zmq_assert (rc == 0);
+    rc = zmq_msg_init (msg_);
+    zmq_assert (rc == 0);
+    return 0;
+}
+
+bool zmq::xsub_t::xhas_out ()
+{
+    //  Subscription can be added/removed anytime.
+    return true;
+}
+
+int zmq::xsub_t::xrecv (zmq_msg_t *msg_, int flags_)
+{
+    //  If there's already a message prepared by a previous call to zmq_poll,
+    //  return it straight ahead.
+    if (has_message) {
+        zmq_msg_move (msg_, &message);
+        has_message = false;
+        more = msg_->flags & ZMQ_MSG_MORE;
+        return 0;
+    }
+
+    //  TODO: This can result in infinite loop in the case of continuous
+    //  stream of non-matching messages which breaks the non-blocking recv
+    //  semantics.
+    while (true) {
+
+        //  Get a message using fair queueing algorithm.
+        int rc = fq.recv (msg_, flags_);
+
+        //  If there's no message available, return immediately.
+        //  The same when error occurs.
+        if (rc != 0)
+            return -1;
+
+        //  Check whether the message matches at least one subscription.
+        //  Non-initial parts of the message are passed 
+        if (more || match (msg_)) {
+            more = msg_->flags & ZMQ_MSG_MORE;
+            return 0;
+        }
+
+        //  Message doesn't match. Pop any remaining parts of the message
+        //  from the pipe.
+        while (msg_->flags & ZMQ_MSG_MORE) {
+            rc = fq.recv (msg_, ZMQ_NOBLOCK);
+            zmq_assert (rc == 0);
+        }
+    }
+}
+
+bool zmq::xsub_t::xhas_in ()
+{
+    //  There are subsequent parts of the partly-read message available.
+    if (more)
+        return true;
+
+    //  If there's already a message prepared by a previous call to zmq_poll,
+    //  return straight ahead.
+    if (has_message)
+        return true;
+
+    //  TODO: This can result in infinite loop in the case of continuous
+    //  stream of non-matching messages.
+    while (true) {
+
+        //  Get a message using fair queueing algorithm.
+        int rc = fq.recv (&message, ZMQ_NOBLOCK);
+
+        //  If there's no message available, return immediately.
+        //  The same when error occurs.
+        if (rc != 0) {
+            zmq_assert (errno == EAGAIN);
+            return false;
+        }
+
+        //  Check whether the message matches at least one subscription.
+        if (match (&message)) {
+            has_message = true;
+            return true;
+        }
+
+        //  Message doesn't match. Pop any remaining parts of the message
+        //  from the pipe.
+        while (message.flags & ZMQ_MSG_MORE) {
+            rc = fq.recv (&message, ZMQ_NOBLOCK);
+            zmq_assert (rc == 0);
+        }
+    }
+}
+
+bool zmq::xsub_t::match (zmq_msg_t *msg_)
+{
+    return subscriptions.check ((unsigned char*) zmq_msg_data (msg_),
+        zmq_msg_size (msg_));
+}
diff --git a/src/xsub.hpp b/src/xsub.hpp
new file mode 100644
index 0000000..6bd55ad
--- /dev/null
+++ b/src/xsub.hpp
@@ -0,0 +1,80 @@
+/*
+    Copyright (c) 2007-2011 iMatix Corporation
+    Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
+
+    This file is part of 0MQ.
+
+    0MQ is free software; you can redistribute it and/or modify it under
+    the terms of the GNU Lesser General Public License as published by
+    the Free Software Foundation; either version 3 of the License, or
+    (at your option) any later version.
+
+    0MQ is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU Lesser General Public License for more details.
+
+    You should have received a copy of the GNU Lesser General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef __ZMQ_XSUB_HPP_INCLUDED__
+#define __ZMQ_XSUB_HPP_INCLUDED__
+
+#include "../include/zmq.h"
+
+#include "trie.hpp"
+#include "socket_base.hpp"
+#include "fq.hpp"
+
+namespace zmq
+{
+
+    class xsub_t : public socket_base_t
+    {
+    public:
+
+        xsub_t (class ctx_t *parent_, uint32_t tid_);
+        ~xsub_t ();
+
+    protected:
+
+        //  Overloads of functions from socket_base_t.
+        void xattach_pipes (class reader_t *inpipe_, class writer_t *outpipe_,
+            const blob_t &peer_identity_);
+        int xsend (zmq_msg_t *msg_, int options_);
+        bool xhas_out ();
+        int xrecv (zmq_msg_t *msg_, int flags_);
+        bool xhas_in ();
+
+    private:
+
+        //  Hook into the termination process.
+        void process_term (int linger_);
+
+        //  Check whether the message matches at least one subscription.
+        bool match (zmq_msg_t *msg_);
+
+        //  Fair queueing object for inbound pipes.
+        fq_t fq;
+
+        //  The repository of subscriptions.
+        trie_t subscriptions;
+
+        //  If true, 'message' contains a matching message to return on the
+        //  next recv call.
+        bool has_message;
+        zmq_msg_t message;
+
+        //  If true, part of a multipart message was already received, but
+        //  there are following parts still waiting.
+        bool more;
+
+        xsub_t (const xsub_t&);
+        const xsub_t &operator = (const xsub_t&);
+    };
+
+}
+
+#endif
+
diff --git a/src/yarray_item.hpp b/src/yarray_item.hpp
deleted file mode 100644
index db24dda..0000000
--- a/src/yarray_item.hpp
+++ /dev/null
@@ -1,64 +0,0 @@
-/*
-    Copyright (c) 2007-2010 iMatix Corporation
-
-    This file is part of 0MQ.
-
-    0MQ is free software; you can redistribute it and/or modify it under
-    the terms of the Lesser GNU General Public License as published by
-    the Free Software Foundation; either version 3 of the License, or
-    (at your option) any later version.
-
-    0MQ is distributed in the hope that it will be useful,
-    but WITHOUT ANY WARRANTY; without even the implied warranty of
-    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    Lesser GNU General Public License for more details.
-
-    You should have received a copy of the Lesser GNU General Public License
-    along with this program.  If not, see <http://www.gnu.org/licenses/>.
-*/
-
-#ifndef __ZMQ_YARRAY_ITEM_INCLUDED__
-#define __ZMQ_YARRAY_ITEM_INCLUDED__
-
-namespace zmq
-{
-
-    //  Base class for objects stored in yarray. Note that each object can
-    //  be stored in at most one yarray.
-
-    class yarray_item_t
-    {
-    public:
-
-        inline yarray_item_t () :
-            yarray_index (-1)
-        {
-        }
-
-        //  The destructor doesn't have to be virtual. It is mad virtual
-        //  just to keep ICC and code checking tools from complaining.
-        inline virtual ~yarray_item_t ()
-        {
-        }
-
-        inline void set_yarray_index (int index_)
-        {
-            yarray_index = index_;
-        }
-
-        inline int get_yarray_index ()
-        {
-            return yarray_index;
-        }
-
-    private:
-
-        int yarray_index;
-
-        yarray_item_t (const yarray_item_t&);
-        void operator = (const yarray_item_t&);
-    };
-
-}
-
-#endif
diff --git a/src/ypipe.hpp b/src/ypipe.hpp
index 1785b71..da4e85a 100644
--- a/src/ypipe.hpp
+++ b/src/ypipe.hpp
@@ -1,19 +1,20 @@
 /*
-    Copyright (c) 2007-2010 iMatix Corporation
+    Copyright (c) 2007-2011 iMatix Corporation
+    Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
 
     This file is part of 0MQ.
 
     0MQ is free software; you can redistribute it and/or modify it under
-    the terms of the Lesser GNU General Public License as published by
+    the terms of the GNU Lesser General Public License as published by
     the Free Software Foundation; either version 3 of the License, or
     (at your option) any later version.
 
     0MQ is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    Lesser GNU General Public License for more details.
+    GNU Lesser General Public License for more details.
 
-    You should have received a copy of the Lesser GNU General Public License
+    You should have received a copy of the GNU Lesser General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
@@ -200,7 +201,7 @@ namespace zmq
 
         //  Disable copying of ypipe object.
         ypipe_t (const ypipe_t&);
-        void operator = (const ypipe_t&);
+        const ypipe_t &operator = (const ypipe_t&);
     };
 
 }
diff --git a/src/yqueue.hpp b/src/yqueue.hpp
index 9eaceb5..e436ea4 100644
--- a/src/yqueue.hpp
+++ b/src/yqueue.hpp
@@ -1,19 +1,20 @@
 /*
-    Copyright (c) 2007-2010 iMatix Corporation
+    Copyright (c) 2007-2011 iMatix Corporation
+    Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
 
     This file is part of 0MQ.
 
     0MQ is free software; you can redistribute it and/or modify it under
-    the terms of the Lesser GNU General Public License as published by
+    the terms of the GNU Lesser General Public License as published by
     the Free Software Foundation; either version 3 of the License, or
     (at your option) any later version.
 
     0MQ is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    Lesser GNU General Public License for more details.
+    GNU Lesser General Public License for more details.
 
-    You should have received a copy of the Lesser GNU General Public License
+    You should have received a copy of the GNU Lesser General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
@@ -50,7 +51,7 @@ namespace zmq
         inline yqueue_t ()
         {
              begin_chunk = (chunk_t*) malloc (sizeof (chunk_t));
-             zmq_assert (begin_chunk);
+             alloc_assert (begin_chunk);
              begin_pos = 0;
              back_chunk = NULL;
              back_pos = 0;
@@ -105,7 +106,7 @@ namespace zmq
                 sc->prev = end_chunk;
             } else {
                 end_chunk->next = (chunk_t*) malloc (sizeof (chunk_t));
-                zmq_assert (end_chunk->next);
+                alloc_assert (end_chunk->next);
                 end_chunk->next->prev = end_chunk;
             }
             end_chunk = end_chunk->next;
@@ -189,7 +190,7 @@ namespace zmq
 
         //  Disable copying of yqueue.
         yqueue_t (const yqueue_t&);
-        void operator = (const yqueue_t&);
+        const yqueue_t &operator = (const yqueue_t&);
     };
 
 }
diff --git a/src/zmq.cpp b/src/zmq.cpp
index 5770e04..929e51c 100644
--- a/src/zmq.cpp
+++ b/src/zmq.cpp
@@ -1,22 +1,37 @@
 /*
-    Copyright (c) 2007-2010 iMatix Corporation
+    Copyright (c) 2007-2011 iMatix Corporation
+    Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
 
     This file is part of 0MQ.
 
     0MQ is free software; you can redistribute it and/or modify it under
-    the terms of the Lesser GNU General Public License as published by
+    the terms of the GNU Lesser General Public License as published by
     the Free Software Foundation; either version 3 of the License, or
     (at your option) any later version.
 
     0MQ is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    Lesser GNU General Public License for more details.
+    GNU Lesser General Public License for more details.
 
-    You should have received a copy of the Lesser GNU General Public License
+    You should have received a copy of the GNU Lesser General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
+#include "platform.hpp"
+
+//  On AIX, poll.h has to be included before zmq.h to get consistent
+//  definition of pollfd structure (AIX uses 'reqevents' and 'retnevents'
+//  instead of 'events' and 'revents' and defines macros to map from POSIX-y
+//  names to AIX-specific names).
+#if defined ZMQ_HAVE_LINUX || defined ZMQ_HAVE_FREEBSD ||\
+    defined ZMQ_HAVE_OPENBSD || defined ZMQ_HAVE_SOLARIS ||\
+    defined ZMQ_HAVE_OSX || defined ZMQ_HAVE_QNXNTO ||\
+    defined ZMQ_HAVE_HPUX || defined ZMQ_HAVE_AIX ||\
+    defined ZMQ_HAVE_NETBSD
+#include <poll.h>
+#endif
+
 #include "../include/zmq.h"
 #include "../include/zmq_utils.h"
 
@@ -25,34 +40,30 @@
 #include <stdlib.h>
 #include <new>
 
-#include "forwarder.hpp"
-#include "queue.hpp"
-#include "streamer.hpp"
+#include "device.hpp"
 #include "socket_base.hpp"
-#include "app_thread.hpp"
 #include "msg_content.hpp"
-#include "platform.hpp"
 #include "stdint.hpp"
 #include "config.hpp"
+#include "likely.hpp"
+#include "clock.hpp"
 #include "ctx.hpp"
 #include "err.hpp"
 #include "fd.hpp"
 
-#if defined ZMQ_HAVE_LINUX || defined ZMQ_HAVE_FREEBSD ||\
-    defined ZMQ_HAVE_OPENBSD || defined ZMQ_HAVE_SOLARIS ||\
-    defined ZMQ_HAVE_OSX || defined ZMQ_HAVE_QNXNTO ||\
-    defined ZMQ_HAVE_HPUX || defined ZMQ_HAVE_AIX ||\
-    defined ZMQ_HAVE_NETBSD
-#include <poll.h>
-#endif
-
 #if !defined ZMQ_HAVE_WINDOWS
 #include <unistd.h>
-#include <sys/time.h>
 #endif
 
 #if defined ZMQ_HAVE_OPENPGM
+#define __PGM_WININT_H__
 #include <pgm/pgm.h>
+
+//  TODO: OpenPGM redefines bool -- remove this once OpenPGM is fixed.
+#if defined bool
+#undef bool
+#endif
+
 #endif
 
 void zmq_version (int *major_, int *minor_, int *patch_)
@@ -64,43 +75,7 @@ void zmq_version (int *major_, int *minor_, int *patch_)
 
 const char *zmq_strerror (int errnum_)
 {
-    switch (errnum_) {
-#if defined ZMQ_HAVE_WINDOWS
-    case ENOTSUP:
-        return "Not supported";
-    case EPROTONOSUPPORT:
-        return "Protocol not supported";
-    case ENOBUFS:
-        return "No buffer space available";
-    case ENETDOWN:
-        return "Network is down";
-    case EADDRINUSE:
-        return "Address in use";
-    case EADDRNOTAVAIL:
-        return "Address not available";
-    case ECONNREFUSED:
-        return "Connection refused";
-    case EINPROGRESS:
-        return "Operation in progress";
-#endif
-    case EMTHREAD:
-        return "Number of preallocated application threads exceeded";
-    case EFSM:
-        return "Operation cannot be accomplished in current state";
-    case ENOCOMPATPROTO:
-        return "The protocol is not compatible with the socket type";
-    case ETERM:
-        return "Context was terminated";
-    default:
-#if defined _MSC_VER
-#pragma warning (push)
-#pragma warning (disable:4996)
-#endif
-        return strerror (errnum_);
-#if defined _MSC_VER
-#pragma warning (pop)
-#endif
-    }
+    return zmq::errno_to_string (errnum_);
 }
 
 int zmq_msg_init (zmq_msg_t *msg_)
@@ -141,7 +116,7 @@ int zmq_msg_init_data (zmq_msg_t *msg_, void *data_, size_t size_,
     zmq_free_fn *ffn_, void *hint_)
 {
     msg_->content = (zmq::msg_content_t*) malloc (sizeof (zmq::msg_content_t));
-    zmq_assert (msg_->content);
+    alloc_assert (msg_->content);
     msg_->flags = 0;
     zmq::msg_content_t *content = (zmq::msg_content_t*) msg_->content;
     content->data = data_;
@@ -155,24 +130,30 @@ int zmq_msg_init_data (zmq_msg_t *msg_, void *data_, size_t size_,
 int zmq_msg_close (zmq_msg_t *msg_)
 {
     //  For VSMs and delimiters there are no resources to free.
-    if (msg_->content == (zmq::msg_content_t*) ZMQ_DELIMITER ||
-          msg_->content == (zmq::msg_content_t*) ZMQ_VSM)
-        return 0;
+    if (msg_->content != (zmq::msg_content_t*) ZMQ_DELIMITER &&
+          msg_->content != (zmq::msg_content_t*) ZMQ_VSM) {
 
-    //  If the content is not shared, or if it is shared and the reference.
-    //  count has dropped to zero, deallocate it.
-    zmq::msg_content_t *content = (zmq::msg_content_t*) msg_->content;
-    if (!(msg_->flags & ZMQ_MSG_SHARED) || !content->refcnt.sub (1)) {
+        //  If the content is not shared, or if it is shared and the reference.
+        //  count has dropped to zero, deallocate it.
+        zmq::msg_content_t *content = (zmq::msg_content_t*) msg_->content;
+        if (!(msg_->flags & ZMQ_MSG_SHARED) || !content->refcnt.sub (1)) {
 
-        //  We used "placement new" operator to initialize the reference.
-        //  counter so we call its destructor now.
-        content->refcnt.~atomic_counter_t ();
+            //  We used "placement new" operator to initialize the reference.
+            //  counter so we call its destructor now.
+            content->refcnt.~atomic_counter_t ();
 
-        if (content->ffn)
-            content->ffn (content->data, content->hint);
-        free (content);
+            if (content->ffn)
+                content->ffn (content->data, content->hint);
+            free (content);
+        }
     }
 
+    //  As a safety measure, let's make the deallocated message look like
+    //  an empty message.
+    msg_->content = (zmq::msg_content_t*) ZMQ_VSM;
+    msg_->flags = 0;
+    msg_->vsm_size = 0;
+
     return 0;
 }
 
@@ -235,38 +216,47 @@ void *zmq_init (int io_threads_)
     }
 
 #if defined ZMQ_HAVE_OPENPGM
-    //  Unfortunately, OpenPGM doesn't support refcounted init/shutdown, thus,
-    //  let's fail if it was initialised beforehand.
-    zmq_assert (!pgm_supported ());
 
     //  Init PGM transport. Ensure threading and timer are enabled. Find PGM
     //  protocol ID. Note that if you want to use gettimeofday and sleep for
     //  openPGM timing, set environment variables PGM_TIMER to "GTOD" and
     //  PGM_SLEEP to "USLEEP".
-    GError *pgm_error = NULL;
-    int rc = pgm_init (&pgm_error);
-    if (rc != TRUE) {
-        if (pgm_error->domain == PGM_IF_ERROR && (
-              pgm_error->code == PGM_IF_ERROR_INVAL ||
-              pgm_error->code == PGM_IF_ERROR_XDEV ||
-              pgm_error->code == PGM_IF_ERROR_NODEV ||
-              pgm_error->code == PGM_IF_ERROR_NOTUNIQ ||
-              pgm_error->code == PGM_IF_ERROR_ADDRFAMILY ||
-              pgm_error->code == PGM_IF_ERROR_FAMILY ||
-              pgm_error->code == PGM_IF_ERROR_NODATA ||
-              pgm_error->code == PGM_IF_ERROR_NONAME ||
-              pgm_error->code == PGM_IF_ERROR_SERVICE)) {
-            g_error_free (pgm_error);
+    pgm_error_t *pgm_error = NULL;
+    const bool ok = pgm_init (&pgm_error);
+    if (ok != TRUE) {
+
+        //  Invalid parameters don't set pgm_error_t
+        zmq_assert (pgm_error != NULL);
+        if (pgm_error->domain == PGM_ERROR_DOMAIN_TIME && (
+              pgm_error->code == PGM_ERROR_FAILED)) {
+
+            //  Failed to access RTC or HPET device.
+            pgm_error_free (pgm_error);
             errno = EINVAL;
             return NULL;
         }
+
+        //  PGM_ERROR_DOMAIN_ENGINE: WSAStartup errors or missing WSARecvMsg.
         zmq_assert (false);
     }
 #endif
 
+#ifdef ZMQ_HAVE_WINDOWS
+    //  Intialise Windows sockets. Note that WSAStartup can be called multiple
+    //  times given that WSACleanup will be called for each WSAStartup.
+   //  We do this before the ctx constructor since its embedded mailbox_t
+   //  object needs Winsock to be up and running.
+    WORD version_requested = MAKEWORD (2, 2);
+    WSADATA wsa_data;
+    int rc = WSAStartup (version_requested, &wsa_data);
+    zmq_assert (rc == 0);
+    zmq_assert (LOBYTE (wsa_data.wVersion) == 2 &&
+        HIBYTE (wsa_data.wVersion) == 2);
+#endif
+
     //  Create 0MQ context.
     zmq::ctx_t *ctx = new (std::nothrow) zmq::ctx_t ((uint32_t) io_threads_);
-    zmq_assert (ctx);
+    alloc_assert (ctx);
     return (void*) ctx;
 }
 
@@ -277,9 +267,15 @@ int zmq_term (void *ctx_)
         return -1;
     }
 
-    int rc = ((zmq::ctx_t*) ctx_)->term ();
+    int rc = ((zmq::ctx_t*) ctx_)->terminate ();
     int en = errno;
 
+#ifdef ZMQ_HAVE_WINDOWS
+    //  On Windows, uninitialise socket layer.
+    rc = WSACleanup ();
+    wsa_assert (rc != SOCKET_ERROR);
+#endif
+
 #if defined ZMQ_HAVE_OPENPGM
     //  Shut down the OpenPGM library.
     if (pgm_shutdown () != TRUE)
@@ -366,158 +362,203 @@ int zmq_recv (void *s_, zmq_msg_t *msg_, int flags_)
     return (((zmq::socket_base_t*) s_)->recv (msg_, flags_));
 }
 
-int zmq_poll (zmq_pollitem_t *items_, int nitems_, long timeout_)
-{
-#if defined ZMQ_HAVE_LINUX || defined ZMQ_HAVE_FREEBSD ||\
+#if defined ZMQ_FORCE_SELECT
+#define ZMQ_POLL_BASED_ON_SELECT
+#elif defined ZMQ_FORCE_POLL
+#define ZMQ_POLL_BASED_ON_POLL
+#elif defined ZMQ_HAVE_LINUX || defined ZMQ_HAVE_FREEBSD ||\
     defined ZMQ_HAVE_OPENBSD || defined ZMQ_HAVE_SOLARIS ||\
     defined ZMQ_HAVE_OSX || defined ZMQ_HAVE_QNXNTO ||\
     defined ZMQ_HAVE_HPUX || defined ZMQ_HAVE_AIX ||\
     defined ZMQ_HAVE_NETBSD
+#define ZMQ_POLL_BASED_ON_POLL
+#elif defined ZMQ_HAVE_WINDOWS || defined ZMQ_HAVE_OPENVMS
+#define ZMQ_POLL_BASED_ON_SELECT
+#endif
+
+int zmq_poll (zmq_pollitem_t *items_, int nitems_, long timeout_)
+{
+#if defined ZMQ_POLL_BASED_ON_POLL
+    if (unlikely (nitems_ < 0)) {
+        errno = EINVAL;
+        return -1;
+    }
+    if (unlikely (nitems_ == 0)) {
+        if (timeout_ == 0)
+            return 0;
+#if defined ZMQ_HAVE_WINDOWS
+        Sleep (timeout_ > 0 ? timeout_ / 1000 : INFINITE);
+        return 0;
+#else
+        return usleep (timeout_);
+#endif
+    }
 
     if (!items_) {
         errno = EFAULT;
         return -1;
     }
-    pollfd *pollfds = (pollfd*) malloc (nitems_ * sizeof (pollfd));
-    zmq_assert (pollfds);
-    int npollfds = 0;
-    int nsockets = 0;
 
-    zmq::app_thread_t *app_thread = NULL;
+    zmq::clock_t clock;
+    uint64_t now = 0;
+    uint64_t end = 0;
+
+    pollfd *pollfds = (pollfd*) malloc (nitems_ * sizeof (pollfd));
+    alloc_assert (pollfds);
 
+    //  Build pollset for poll () system call.
     for (int i = 0; i != nitems_; i++) {
 
-        //  0MQ sockets.
+        //  If the poll item is a 0MQ socket, we poll on the file descriptor
+        //  retrieved by the ZMQ_FD socket option.
         if (items_ [i].socket) {
-
-            //  Get the app_thread the socket is living in. If there are two
-            //  sockets in the same pollset with different app threads, fail.
-            zmq::socket_base_t *s = (zmq::socket_base_t*) items_ [i].socket;
-            if (app_thread) {
-                if (app_thread != s->get_thread ()) {
-                    free (pollfds);
-                    errno = EFAULT;
-                    return -1;
-                }
+            size_t zmq_fd_size = sizeof (zmq::fd_t);
+            if (zmq_getsockopt (items_ [i].socket, ZMQ_FD, &pollfds [i].fd,
+                &zmq_fd_size) == -1) {
+                free (pollfds);
+                return -1;
             }
-            else
-                app_thread = s->get_thread ();
-
-            nsockets++;
-            continue;
+            pollfds [i].events = items_ [i].events ? POLLIN : 0;
         }
-
-        //  Raw file descriptors.
-        pollfds [npollfds].fd = items_ [i].fd;
-        pollfds [npollfds].events =
-            (items_ [i].events & ZMQ_POLLIN ? POLLIN : 0) |
-            (items_ [i].events & ZMQ_POLLOUT ? POLLOUT : 0);
-        npollfds++;
-    }
-
-    //  If there's at least one 0MQ socket in the pollset we have to poll
-    //  for 0MQ commands. If ZMQ_POLL was not set, fail.
-    if (nsockets) {
-        pollfds [npollfds].fd = app_thread->get_signaler ()->get_fd ();
-        if (pollfds [npollfds].fd == zmq::retired_fd) {
-            free (pollfds);
-            errno = ENOTSUP;
-            return -1;
+        //  Else, the poll item is a raw file descriptor. Just convert the
+        //  events to normal POLLIN/POLLOUT for poll ().
+        else {
+            pollfds [i].fd = items_ [i].fd;
+            pollfds [i].events =
+                (items_ [i].events & ZMQ_POLLIN ? POLLIN : 0) |
+                (items_ [i].events & ZMQ_POLLOUT ? POLLOUT : 0);
         }
-        pollfds [npollfds].events = POLLIN;
-        npollfds++;
-    }
-
-    //  First iteration just check for events, don't block. Waiting would
-    //  prevent exiting on any events that may already been signaled on
-    //  0MQ sockets.
-    int rc = poll (pollfds, npollfds, 0);
-    if (rc == -1 && errno == EINTR && timeout_ >= 0) {
-        free (pollfds);
-        return 0;
     }
-    errno_assert (rc >= 0 || (rc == -1 && errno == EINTR));
 
-    int timeout = timeout_ > 0 ? timeout_ / 1000 : -1;
+    bool first_pass = true;
     int nevents = 0;
 
     while (true) {
 
-        //  Process 0MQ commands if needed.
-        if (nsockets && pollfds [npollfds -1].revents & POLLIN)
-            if (!app_thread->process_commands (false, false)) {
+         //  Compute the timeout for the subsequent poll.
+         int timeout;
+         if (first_pass)
+             timeout = 0;
+         else if (timeout_ < 0)
+             timeout = -1;
+         else
+             timeout = end - now;
+
+        //  Wait for events.
+        while (true) {
+            int rc = poll (pollfds, nitems_, timeout);
+            if (rc == -1 && errno == EINTR) {
                 free (pollfds);
-                errno = ETERM;
                 return -1;
             }
+            errno_assert (rc >= 0);
+            break;
+        }
 
         //  Check for the events.
-        int pollfd_pos = 0;
         for (int i = 0; i != nitems_; i++) {
 
-            //  If the poll item is a raw file descriptor, simply convert
+            items_ [i].revents = 0;
+
+            //  The poll item is a 0MQ socket. Retrieve pending events
+            //  using the ZMQ_EVENTS socket option.
+            if (items_ [i].socket) {
+                size_t zmq_events_size = sizeof (uint32_t);
+                uint32_t zmq_events;
+                if (zmq_getsockopt (items_ [i].socket, ZMQ_EVENTS, &zmq_events,
+                    &zmq_events_size) == -1) {
+                    free (pollfds);
+                    return -1;
+                }
+                if ((items_ [i].events & ZMQ_POLLOUT) &&
+                      (zmq_events & ZMQ_POLLOUT))
+                    items_ [i].revents |= ZMQ_POLLOUT;
+                if ((items_ [i].events & ZMQ_POLLIN) &&
+                      (zmq_events & ZMQ_POLLIN))
+                    items_ [i].revents |= ZMQ_POLLIN;
+            }
+            //  Else, the poll item is a raw file descriptor, simply convert
             //  the events to zmq_pollitem_t-style format.
-            if (!items_ [i].socket) {
-                items_ [i].revents = 0;
-                if (pollfds [pollfd_pos].revents & POLLIN)
+            else {
+                if (pollfds [i].revents & POLLIN)
                     items_ [i].revents |= ZMQ_POLLIN;
-                if (pollfds [pollfd_pos].revents & POLLOUT)
+                if (pollfds [i].revents & POLLOUT)
                     items_ [i].revents |= ZMQ_POLLOUT;
-                if (pollfds [pollfd_pos].revents & ~(POLLIN | POLLOUT))
+                if (pollfds [i].revents & ~(POLLIN | POLLOUT))
                     items_ [i].revents |= ZMQ_POLLERR;
-
-                if (items_ [i].revents)
-                    nevents++;
-                pollfd_pos++;
-                continue;
             }
 
-            //  The poll item is a 0MQ socket.
-            zmq::socket_base_t *s = (zmq::socket_base_t*) items_ [i].socket;
-            items_ [i].revents = 0;
-            if ((items_ [i].events & ZMQ_POLLOUT) && s->has_out ())
-                items_ [i].revents |= ZMQ_POLLOUT;
-            if ((items_ [i].events & ZMQ_POLLIN) && s->has_in ())
-                items_ [i].revents |= ZMQ_POLLIN;
             if (items_ [i].revents)
                 nevents++;
         }
 
-        //  If there's at least one event, or if we are asked not to block,
-        //  return immediately.
-        if (nevents || !timeout_)
+        //  If timout is zero, exit immediately whether there are events or not.
+        if (timeout_ == 0)
             break;
 
-        //  Wait for events. Ignore interrupts if there's infinite timeout.
-        while (true) {
-            rc = poll (pollfds, npollfds, timeout);
-            if (rc == -1 && errno == EINTR) {
-                if (timeout_ < 0)
-                    continue;
-                else {
-                    rc = 0;
-                    break;
-                }
-            }
-            errno_assert (rc >= 0);
+        //  If there are events to return, we can exit immediately.
+        if (nevents)
             break;
+
+        //  At this point we are meant to wait for events but there are none.
+        //  If timeout is infinite we can just loop until we get some events.
+        if (timeout_ < 0) {
+            if (first_pass)
+                first_pass = false;
+            continue;
         }
-        
-        //  If timeout was hit with no events signaled, return zero.
-        if (rc == 0)
-            break;
 
-        //  If timeout was already applied, we don't want to poll anymore.
-        //  Setting timeout to zero will cause termination of the function
-        //  once the events we've got are processed.
-        if (timeout > 0)
-            timeout = 0;
+        //  The timeout is finite and there are no events. In the first pass
+        //  we get a timestamp of when the polling have begun. (We assume that
+        //  first pass have taken negligible time). We also compute the time
+        //  when the polling should time out.
+        if (first_pass) {
+            now = clock.now_ms ();
+            end = now + (timeout_ / 1000);
+            if (now == end)
+                break;
+            first_pass = false;
+            continue;
+        }
+
+        //  Find out whether timeout have expired.
+        now = clock.now_ms ();
+        if (now >= end)
+            break;
     }
 
     free (pollfds);
     return nevents;
 
-#elif defined ZMQ_HAVE_WINDOWS || defined ZMQ_HAVE_OPENVMS
+#elif defined ZMQ_POLL_BASED_ON_SELECT
+
+    if (unlikely (nitems_ < 0)) {
+        errno = EINVAL;
+        return -1;
+    }
+    if (unlikely (nitems_ == 0)) {
+        if (timeout_ == 0)
+            return 0;
+#if defined ZMQ_HAVE_WINDOWS
+        Sleep (timeout_ > 0 ? timeout_ / 1000 : INFINITE);
+        return 0;
+#else
+        return usleep (timeout_);
+#endif
+    }
+
+    if (!items_) {
+        errno = EFAULT;
+        return -1;
+    }
+
+    zmq::clock_t clock;
+    uint64_t now = 0;
+    uint64_t end = 0;
+
+    //  Ensure we do not attempt to select () on more than FD_SETSIZE
+    //  file descriptors.
+    zmq_assert (nitems_ <= FD_SETSIZE);
 
     fd_set pollset_in;
     FD_ZERO (&pollset_in);
@@ -526,166 +567,163 @@ int zmq_poll (zmq_pollitem_t *items_, int nitems_, long timeout_)
     fd_set pollset_err;
     FD_ZERO (&pollset_err);
 
-    zmq::app_thread_t *app_thread = NULL;
-    int nsockets = 0;
-    zmq::fd_t maxfd = zmq::retired_fd;
-    zmq::fd_t notify_fd = zmq::retired_fd;
-
-    //  Ensure we do not attempt to select () on more than FD_SETSIZE
-    //  file descriptors.
-    zmq_assert (nitems_ <= FD_SETSIZE);
+    zmq::fd_t maxfd = 0;
 
+    //  Build the fd_sets for passing to select ().
     for (int i = 0; i != nitems_; i++) {
 
-        //  0MQ sockets.
+        //  If the poll item is a 0MQ socket we are interested in input on the
+        //  notification file descriptor retrieved by the ZMQ_FD socket option.
         if (items_ [i].socket) {
-
-            //  Get the app_thread the socket is living in. If there are two
-            //  sockets in the same pollset with different app threads, fail.
-            zmq::socket_base_t *s = (zmq::socket_base_t*) items_ [i].socket;
-            if (app_thread) {
-                if (app_thread != s->get_thread ()) {
-                    errno = EFAULT;
-                    return -1;
-                }
+            size_t zmq_fd_size = sizeof (zmq::fd_t);
+            zmq::fd_t notify_fd;
+            if (zmq_getsockopt (items_ [i].socket, ZMQ_FD, &notify_fd,
+                &zmq_fd_size) == -1)
+                return -1;
+            if (items_ [i].events) {
+                FD_SET (notify_fd, &pollset_in);
+                if (maxfd < notify_fd)
+                    maxfd = notify_fd;
             }
-            else
-                app_thread = s->get_thread ();
-
-            nsockets++;
-            continue;
         }
-
-        //  Raw file descriptors.
-        if (items_ [i].events & ZMQ_POLLIN)
-            FD_SET (items_ [i].fd, &pollset_in);
-        if (items_ [i].events & ZMQ_POLLOUT)
-            FD_SET (items_ [i].fd, &pollset_out);
-        if (items_ [i].events & ZMQ_POLLERR)
-            FD_SET (items_ [i].fd, &pollset_err);
-        if (maxfd == zmq::retired_fd || maxfd < items_ [i].fd)
-            maxfd = items_ [i].fd;
-    }
-
-    //  If there's at least one 0MQ socket in the pollset we have to poll
-    //  for 0MQ commands. If ZMQ_POLL was not set, fail.
-    if (nsockets) {
-        notify_fd = app_thread->get_signaler ()->get_fd ();
-        if (notify_fd == zmq::retired_fd) {
-            errno = ENOTSUP;
-            return -1;
+        //  Else, the poll item is a raw file descriptor. Convert the poll item
+        //  events to the appropriate fd_sets.
+        else {
+            if (items_ [i].events & ZMQ_POLLIN)
+                FD_SET (items_ [i].fd, &pollset_in);
+            if (items_ [i].events & ZMQ_POLLOUT)
+                FD_SET (items_ [i].fd, &pollset_out);
+            if (items_ [i].events & ZMQ_POLLERR)
+                FD_SET (items_ [i].fd, &pollset_err);
+            if (maxfd < items_ [i].fd)
+                maxfd = items_ [i].fd;
         }
-        FD_SET (notify_fd, &pollset_in);
-        if (maxfd == zmq::retired_fd || maxfd < notify_fd)
-            maxfd = notify_fd;
     }
 
-    bool block = (timeout_ < 0);
-    timeval timeout = {timeout_ / 1000000, timeout_ % 1000000};
-    timeval zero_timeout = {0, 0};
+    bool first_pass = true;
     int nevents = 0;
-
-    //  First iteration just check for events, don't block. Waiting would
-    //  prevent exiting on any events that may already been signaled on
-    //  0MQ sockets.
     fd_set inset, outset, errset;
-    memcpy (&inset, &pollset_in, sizeof (fd_set));
-    memcpy (&outset, &pollset_out, sizeof (fd_set));
-    memcpy (&errset, &pollset_err, sizeof (fd_set));
-    int rc = select (maxfd, &inset, &outset, &errset, &zero_timeout);
-#if defined ZMQ_HAVE_WINDOWS
-    wsa_assert (rc != SOCKET_ERROR);
-#else
-    if (rc == -1 && errno == EINTR && timeout_ >= 0)
-        return 0;
-    errno_assert (rc >= 0 || (rc == -1 && errno == EINTR));
-#endif
 
     while (true) {
 
-        //  Process 0MQ commands if needed.
-        if (nsockets && FD_ISSET (notify_fd, &inset))
-            if (!app_thread->process_commands (false, false)) {
-                errno = ETERM;
+        //  Compute the timeout for the subsequent poll.
+        timeval timeout;
+        timeval *ptimeout;
+        if (first_pass) {
+            timeout.tv_sec = 0;
+            timeout.tv_usec = 0;
+            ptimeout = &timeout;
+        }
+        else if (timeout_ < 0)
+            ptimeout = NULL;
+        else {
+            timeout.tv_sec = (long) ((end - now) / 1000);
+            timeout.tv_usec = (long) ((end - now) % 1000 * 1000);
+            ptimeout = &timeout;
+        }
+
+        //  Wait for events. Ignore interrupts if there's infinite timeout.
+        while (true) {
+            memcpy (&inset, &pollset_in, sizeof (fd_set));
+            memcpy (&outset, &pollset_out, sizeof (fd_set));
+            memcpy (&errset, &pollset_err, sizeof (fd_set));
+            int rc = select (maxfd + 1, &inset, &outset, &errset, ptimeout);
+#if defined ZMQ_HAVE_WINDOWS
+            wsa_assert (rc != SOCKET_ERROR);
+#else
+            if (rc == -1 && errno == EINTR)
                 return -1;
-            }
+            errno_assert (rc >= 0);
+#endif
+            break;
+        }
 
         //  Check for the events.
         for (int i = 0; i != nitems_; i++) {
 
-            //  If the poll item is a raw file descriptor, simply convert
+            items_ [i].revents = 0;
+
+            //  The poll item is a 0MQ socket. Retrieve pending events
+            //  using the ZMQ_EVENTS socket option.
+            if (items_ [i].socket) {
+                size_t zmq_events_size = sizeof (uint32_t);
+                uint32_t zmq_events;
+                if (zmq_getsockopt (items_ [i].socket, ZMQ_EVENTS, &zmq_events,
+                      &zmq_events_size) == -1)
+                    return -1;
+                if ((items_ [i].events & ZMQ_POLLOUT) &&
+                      (zmq_events & ZMQ_POLLOUT))
+                    items_ [i].revents |= ZMQ_POLLOUT;
+                if ((items_ [i].events & ZMQ_POLLIN) &&
+                      (zmq_events & ZMQ_POLLIN))
+                    items_ [i].revents |= ZMQ_POLLIN;
+            }
+            //  Else, the poll item is a raw file descriptor, simply convert
             //  the events to zmq_pollitem_t-style format.
-            if (!items_ [i].socket) {
-                items_ [i].revents = 0;
+            else {
                 if (FD_ISSET (items_ [i].fd, &inset))
                     items_ [i].revents |= ZMQ_POLLIN;
                 if (FD_ISSET (items_ [i].fd, &outset))
                     items_ [i].revents |= ZMQ_POLLOUT;
                 if (FD_ISSET (items_ [i].fd, &errset))
                     items_ [i].revents |= ZMQ_POLLERR;
-                if (items_ [i].revents)
-                    nevents++;
-                continue;
             }
 
-            //  The poll item is a 0MQ socket.
-            zmq::socket_base_t *s = (zmq::socket_base_t*) items_ [i].socket;
-            items_ [i].revents = 0;
-            if ((items_ [i].events & ZMQ_POLLOUT) && s->has_out ())
-                items_ [i].revents |= ZMQ_POLLOUT;
-            if ((items_ [i].events & ZMQ_POLLIN) && s->has_in ())
-                items_ [i].revents |= ZMQ_POLLIN;
             if (items_ [i].revents)
                 nevents++;
         }
 
-        //  If there's at least one event, or if we are asked not to block,
-        //  return immediately.
-        if (nevents || (timeout.tv_sec == 0 && timeout.tv_usec == 0))
+        //  If timout is zero, exit immediately whether there are events or not.
+        if (timeout_ == 0)
             break;
 
-        //  Wait for events. Ignore interrupts if there's infinite timeout.
-        while (true) {
-            memcpy (&inset, &pollset_in, sizeof (fd_set));
-            memcpy (&outset, &pollset_out, sizeof (fd_set));
-            memcpy (&errset, &pollset_err, sizeof (fd_set));
-            rc = select (maxfd, &inset, &outset, &errset,
-                block ? NULL : &timeout);
-#if defined ZMQ_HAVE_WINDOWS
-            wsa_assert (rc != SOCKET_ERROR);
-#else
-            if (rc == -1 && errno == EINTR) {
-                if (timeout_ < 0)
-                    continue;
-                else {
-                    rc = 0;
-                    break;
-                }
-            }
-            errno_assert (rc >= 0);
-#endif
+        //  If there are events to return, we can exit immediately.
+        if (nevents)
             break;
+
+        //  At this point we are meant to wait for events but there are none.
+        //  If timeout is infinite we can just loop until we get some events.
+        if (timeout_ < 0) {
+            if (first_pass)
+                first_pass = false;
+            continue;
+        }
+
+        //  The timeout is finite and there are no events. In the first pass
+        //  we get a timestamp of when the polling have begun. (We assume that
+        //  first pass have taken negligible time). We also compute the time
+        //  when the polling should time out.
+        if (first_pass) {
+            now = clock.now_ms ();
+            end = now + (timeout_ / 1000);
+            if (now == end)
+                break;
+            first_pass = false;
+            continue;
         }
-        
-        //  If timeout was hit with no events signaled, return zero.
-        if (rc == 0)
-            break;
 
-        //  If timeout was already applied, we don't want to poll anymore.
-        //  Setting timeout to zero will cause termination of the function
-        //  once the events we've got are processed.
-        if (!block)
-            timeout = zero_timeout;
+        //  Find out whether timeout have expired.
+        now = clock.now_ms ();
+        if (now >= end)
+            break;
     }
 
     return nevents;
 
 #else
+    //  Exotic platforms that support neither poll() nor select().
     errno = ENOTSUP;
     return -1;
 #endif
 }
 
+#if defined ZMQ_POLL_BASED_ON_SELECT
+#undef ZMQ_POLL_BASED_ON_SELECT
+#endif
+#if defined ZMQ_POLL_BASED_ON_POLL
+#undef ZMQ_POLL_BASED_ON_POLL
+#endif
+
 int zmq_errno ()
 {
     return errno;
@@ -697,80 +735,42 @@ int zmq_device (int device_, void *insocket_, void *outsocket_)
         errno = EFAULT;
         return -1;
     }
-    switch (device_) {
-    case ZMQ_FORWARDER:
-        return zmq::forwarder ((zmq::socket_base_t*) insocket_,
-            (zmq::socket_base_t*) outsocket_);
-    case ZMQ_QUEUE:
-        return zmq::queue ((zmq::socket_base_t*) insocket_,
-            (zmq::socket_base_t*) outsocket_);
-    case ZMQ_STREAMER:
-        return zmq::streamer ((zmq::socket_base_t*) insocket_,
-            (zmq::socket_base_t*) outsocket_);
-    default:
-        return EINVAL;
+
+    if (device_ != ZMQ_FORWARDER && device_ != ZMQ_QUEUE &&
+          device_ != ZMQ_STREAMER) {
+       errno = EINVAL;
+       return -1;
     }
+
+    return zmq::device ((zmq::socket_base_t*) insocket_,
+        (zmq::socket_base_t*) outsocket_);
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 //  0MQ utils - to be used by perf tests
 ////////////////////////////////////////////////////////////////////////////////
 
-#if defined ZMQ_HAVE_WINDOWS
-
-static uint64_t now ()
-{    
-    //  Get the high resolution counter's accuracy.
-    LARGE_INTEGER ticksPerSecond;
-    QueryPerformanceFrequency (&ticksPerSecond);
-
-    //  What time is it?
-    LARGE_INTEGER tick;
-    QueryPerformanceCounter (&tick);
-
-    //  Convert the tick number into the number of seconds
-    //  since the system was started.
-    double ticks_div = (double) (ticksPerSecond.QuadPart / 1000000);     
-    return (uint64_t) (tick.QuadPart / ticks_div);
-}
-
 void zmq_sleep (int seconds_)
 {
+#if defined ZMQ_HAVE_WINDOWS
     Sleep (seconds_ * 1000);
-}
-
 #else
-
-static uint64_t now ()
-{
-    struct timeval tv;
-    int rc;
-
-    rc = gettimeofday (&tv, NULL);
-    assert (rc == 0);
-    return (tv.tv_sec * (uint64_t) 1000000 + tv.tv_usec);
-}
-
-void zmq_sleep (int seconds_)
-{
     sleep (seconds_);
-}
-
 #endif
+}
 
 void *zmq_stopwatch_start ()
 {
     uint64_t *watch = (uint64_t*) malloc (sizeof (uint64_t));
-    assert (watch);
-    *watch = now ();
+    alloc_assert (watch);
+    *watch = zmq::clock_t::now_us ();
     return (void*) watch;
 }
 
 unsigned long zmq_stopwatch_stop (void *watch_)
 {
-    uint64_t end = now ();
+    uint64_t end = zmq::clock_t::now_us ();
     uint64_t start = *(uint64_t*) watch_;
     free (watch_);
     return (unsigned long) (end - start);
 }
-
diff --git a/src/zmq_connecter.cpp b/src/zmq_connecter.cpp
index ebd7572..fb77cdc 100644
--- a/src/zmq_connecter.cpp
+++ b/src/zmq_connecter.cpp
@@ -1,73 +1,69 @@
 /*
-    Copyright (c) 2007-2010 iMatix Corporation
+    Copyright (c) 2007-2011 iMatix Corporation
+    Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
 
     This file is part of 0MQ.
 
     0MQ is free software; you can redistribute it and/or modify it under
-    the terms of the Lesser GNU General Public License as published by
+    the terms of the GNU Lesser General Public License as published by
     the Free Software Foundation; either version 3 of the License, or
     (at your option) any later version.
 
     0MQ is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    Lesser GNU General Public License for more details.
+    GNU Lesser General Public License for more details.
 
-    You should have received a copy of the Lesser GNU General Public License
+    You should have received a copy of the GNU Lesser General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
 #include <new>
 
+#include "platform.hpp"
+#if defined ZMQ_HAVE_WINDOWS
+#include "windows.hpp"
+#else
+#include <sys/types.h>
+#include <unistd.h>
+#endif
+
 #include "zmq_connecter.hpp"
 #include "zmq_engine.hpp"
 #include "zmq_init.hpp"
 #include "io_thread.hpp"
 #include "err.hpp"
 
-zmq::zmq_connecter_t::zmq_connecter_t (io_thread_t *parent_,
-      socket_base_t *owner_, const options_t &options_,
-      uint64_t session_ordinal_, bool wait_) :
-    owned_t (parent_, owner_),
-    io_object_t (parent_),
+zmq::zmq_connecter_t::zmq_connecter_t (class io_thread_t *io_thread_,
+      class session_t *session_, const options_t &options_,
+      const char *protocol_, const char *address_, bool wait_) :
+    own_t (io_thread_, options_),
+    io_object_t (io_thread_),
     handle_valid (false),
     wait (wait_),
-    session_ordinal (session_ordinal_),
-    options (options_)
+    session (session_),
+    current_reconnect_ivl(options.reconnect_ivl)
 {
+    int rc = tcp_connecter.set_address (protocol_, address_);
+    zmq_assert (rc == 0);
 }
 
 zmq::zmq_connecter_t::~zmq_connecter_t ()
 {
-}
-
-int zmq::zmq_connecter_t::set_address (const char *protocol_,
-    const char *address_)
-{
-     int rc = tcp_connecter.set_address (protocol_, address_);
-     if (rc != 0)
-         return rc;
-     protocol = protocol_;
-     address = address_;
-     return 0;
+    if (wait)
+        cancel_timer (reconnect_timer_id);
+    if (handle_valid)
+        rm_fd (handle);
 }
 
 void zmq::zmq_connecter_t::process_plug ()
 {
     if (wait)
-        add_timer ();
+        add_reconnect_timer();
     else
         start_connecting ();
 }
 
-void zmq::zmq_connecter_t::process_unplug ()
-{
-    if (wait)
-        cancel_timer ();
-    if (handle_valid)
-        rm_fd (handle);
-}
-
 void zmq::zmq_connecter_t::in_event ()
 {
     //  We are not polling for incomming data, so we are actually called
@@ -86,25 +82,28 @@ void zmq::zmq_connecter_t::out_event ()
     if (fd == retired_fd) {
         tcp_connecter.close ();
         wait = true;
-        add_timer ();
+        add_reconnect_timer();
         return;
     }
 
+    //  Choose I/O thread to run connecter in. Given that we are already
+    //  running in an I/O thread, there must be at least one available.
+    io_thread_t *io_thread = choose_io_thread (options.affinity);
+    zmq_assert (io_thread);
+
     //  Create an init object. 
-    zmq_init_t *init = new (std::nothrow) zmq_init_t (
-        choose_io_thread (options.affinity), owner,
-        fd, options, true, protocol.c_str (), address.c_str (),
-        session_ordinal);
-    zmq_assert (init);
-    send_plug (init);
-    send_own (owner, init);
-
-    //  Ask owner socket to shut the connecter down.
-    term ();
+    zmq_init_t *init = new (std::nothrow) zmq_init_t (io_thread, NULL,
+        session, fd, options);
+    alloc_assert (init);
+    launch_sibling (init);
+
+    //  Shut the connecter down.
+    terminate ();
 }
 
-void zmq::zmq_connecter_t::timer_event ()
+void zmq::zmq_connecter_t::timer_event (int id_)
 {
+    zmq_assert (id_ == reconnect_timer_id);
     wait = false;
     start_connecting ();
 }
@@ -132,5 +131,36 @@ void zmq::zmq_connecter_t::start_connecting ()
 
     //  Handle any other error condition by eventual reconnect.
     wait = true;
-    add_timer ();
+    add_reconnect_timer();
+}
+
+void zmq::zmq_connecter_t::add_reconnect_timer()
+{
+    add_timer (get_new_reconnect_ivl(), reconnect_timer_id);
+}
+
+int zmq::zmq_connecter_t::get_new_reconnect_ivl ()
+{
+#if defined ZMQ_HAVE_WINDOWS
+    int pid = (int) GetCurrentProcessId ();
+#else
+    int pid = (int) getpid ();
+#endif
+
+    //  The new interval is the current interval + random value.
+    int this_interval = current_reconnect_ivl +
+        ((pid * 13) % options.reconnect_ivl);
+
+    //  Only change the current reconnect interval  if the maximum reconnect
+    //  interval was set and if it's larger than the reconnect interval.
+    if (options.reconnect_ivl_max > 0 && 
+        options.reconnect_ivl_max > options.reconnect_ivl) {
+
+        //  Calculate the next interval
+        current_reconnect_ivl = current_reconnect_ivl * 2;
+        if(current_reconnect_ivl >= options.reconnect_ivl_max) {
+            current_reconnect_ivl = options.reconnect_ivl_max;
+        }   
+    }
+    return this_interval;
 }
diff --git a/src/zmq_connecter.hpp b/src/zmq_connecter.hpp
index 328dd6a..31a6d9b 100644
--- a/src/zmq_connecter.hpp
+++ b/src/zmq_connecter.hpp
@@ -1,61 +1,69 @@
 /*
-    Copyright (c) 2007-2010 iMatix Corporation
+    Copyright (c) 2007-2011 iMatix Corporation
+    Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
 
     This file is part of 0MQ.
 
     0MQ is free software; you can redistribute it and/or modify it under
-    the terms of the Lesser GNU General Public License as published by
+    the terms of the GNU Lesser General Public License as published by
     the Free Software Foundation; either version 3 of the License, or
     (at your option) any later version.
 
     0MQ is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    Lesser GNU General Public License for more details.
+    GNU Lesser General Public License for more details.
 
-    You should have received a copy of the Lesser GNU General Public License
+    You should have received a copy of the GNU Lesser General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
 #ifndef __ZMQ_ZMQ_CONNECTER_HPP_INCLUDED__
 #define __ZMQ_ZMQ_CONNECTER_HPP_INCLUDED__
 
-#include <string>
-
-#include "owned.hpp"
+#include "own.hpp"
 #include "io_object.hpp"
 #include "tcp_connecter.hpp"
-#include "options.hpp"
 #include "stdint.hpp"
 
 namespace zmq
 {
 
-    class zmq_connecter_t : public owned_t, public io_object_t
+    class zmq_connecter_t : public own_t, public io_object_t
     {
     public:
 
-        zmq_connecter_t (class io_thread_t *parent_, socket_base_t *owner_,
-            const options_t &options_, uint64_t session_ordinal_, bool wait_);
+        //  If 'wait' is true connecter first waits for a while, then starts
+        //  connection process.
+        zmq_connecter_t (class io_thread_t *io_thread_,
+            class session_t *session_, const options_t &options_,
+            const char *protocol_, const char *address_, bool delay_);
         ~zmq_connecter_t ();
 
-        //  Set address to connect to.
-        int set_address (const char *protocol_, const char *address_);
-
     private:
 
+        //  ID of the timer used to delay the reconnection.
+        enum {reconnect_timer_id = 1};
+
         //  Handlers for incoming commands.
         void process_plug ();
-        void process_unplug ();
 
         //  Handlers for I/O events.
         void in_event ();
         void out_event ();
-        void timer_event ();
+        void timer_event (int id_);
 
         //  Internal function to start the actual connection establishment.
         void start_connecting ();
 
+        //  Internal function to add a reconnect timer
+        void add_reconnect_timer();
+
+        //  Internal function to return a reconnect backoff delay.
+        //  Will modify the current_reconnect_ivl used for next call
+        //  Returns the currently used interval
+        int get_new_reconnect_ivl ();
+
         //  Actual connecting socket.
         tcp_connecter_t tcp_connecter;
 
@@ -69,18 +77,14 @@ namespace zmq
         //  If true, connecter is waiting a while before trying to connect.
         bool wait;
 
-        //  Ordinal of the session to attach to.
-        uint64_t session_ordinal;
-
-        //  Associated socket options.
-        options_t options;
+        //  Reference to the session we belong to.
+        class session_t *session;
 
-        //  Protocol and address to connect to.
-        std::string protocol;
-        std::string address;
+        //  Current reconnect ivl, updated for backoff strategy
+        int current_reconnect_ivl;
 
         zmq_connecter_t (const zmq_connecter_t&);
-        void operator = (const zmq_connecter_t&);
+        const zmq_connecter_t &operator = (const zmq_connecter_t&);
     };
 
 }
diff --git a/src/zmq_decoder.hpp b/src/zmq_decoder.hpp
deleted file mode 100644
index c1e3e3e..0000000
--- a/src/zmq_decoder.hpp
+++ /dev/null
@@ -1,59 +0,0 @@
-/*
-    Copyright (c) 2007-2010 iMatix Corporation
-
-    This file is part of 0MQ.
-
-    0MQ is free software; you can redistribute it and/or modify it under
-    the terms of the Lesser GNU General Public License as published by
-    the Free Software Foundation; either version 3 of the License, or
-    (at your option) any later version.
-
-    0MQ is distributed in the hope that it will be useful,
-    but WITHOUT ANY WARRANTY; without even the implied warranty of
-    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    Lesser GNU General Public License for more details.
-
-    You should have received a copy of the Lesser GNU General Public License
-    along with this program.  If not, see <http://www.gnu.org/licenses/>.
-*/
-
-#ifndef __ZMQ_ZMQ_DECODER_HPP_INCLUDED__
-#define __ZMQ_ZMQ_DECODER_HPP_INCLUDED__
-
-#include "../include/zmq.h"
-
-#include "decoder.hpp"
-#include "blob.hpp"
-
-namespace zmq
-{
-    //  Decoder for 0MQ backend protocol. Converts data batches into messages.
-
-    class zmq_decoder_t : public decoder_t <zmq_decoder_t>
-    {
-    public:
-
-        zmq_decoder_t (size_t bufsize_);
-        ~zmq_decoder_t ();
-
-        void set_inout (struct i_inout *destination_);
-
-    private:
-
-        bool one_byte_size_ready ();
-        bool eight_byte_size_ready ();
-        bool flags_ready ();
-        bool message_ready ();
-
-        struct i_inout *destination;
-        unsigned char tmpbuf [8];
-        ::zmq_msg_t in_progress;
-
-        zmq_decoder_t (const zmq_decoder_t&);
-        void operator = (const zmq_decoder_t&);
-    };
-
-}
-
-#endif
-
diff --git a/src/zmq_encoder.hpp b/src/zmq_encoder.hpp
deleted file mode 100644
index 61899f4..0000000
--- a/src/zmq_encoder.hpp
+++ /dev/null
@@ -1,55 +0,0 @@
-/*
-    Copyright (c) 2007-2010 iMatix Corporation
-
-    This file is part of 0MQ.
-
-    0MQ is free software; you can redistribute it and/or modify it under
-    the terms of the Lesser GNU General Public License as published by
-    the Free Software Foundation; either version 3 of the License, or
-    (at your option) any later version.
-
-    0MQ is distributed in the hope that it will be useful,
-    but WITHOUT ANY WARRANTY; without even the implied warranty of
-    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    Lesser GNU General Public License for more details.
-
-    You should have received a copy of the Lesser GNU General Public License
-    along with this program.  If not, see <http://www.gnu.org/licenses/>.
-*/
-
-#ifndef __ZMQ_ZMQ_ENCODER_HPP_INCLUDED__
-#define __ZMQ_ZMQ_ENCODER_HPP_INCLUDED__
-
-#include "../include/zmq.h"
-
-#include "encoder.hpp"
-
-namespace zmq
-{
-    //  Encoder for 0MQ backend protocol. Converts messages into data batches.
-
-    class zmq_encoder_t : public encoder_t <zmq_encoder_t>
-    {
-    public:
-
-        zmq_encoder_t (size_t bufsize_);
-        ~zmq_encoder_t ();
-
-        void set_inout (struct i_inout *source_);
-
-    private:
-
-        bool size_ready ();
-        bool message_ready ();
-
-        struct i_inout *source;
-        ::zmq_msg_t in_progress;
-        unsigned char tmpbuf [10];
-
-        zmq_encoder_t (const zmq_encoder_t&);
-        void operator = (const zmq_encoder_t&);
-    };
-}
-
-#endif
-
diff --git a/src/zmq_engine.cpp b/src/zmq_engine.cpp
index 41b10c8..57a8baf 100644
--- a/src/zmq_engine.cpp
+++ b/src/zmq_engine.cpp
@@ -1,19 +1,20 @@
 /*
-    Copyright (c) 2007-2010 iMatix Corporation
+    Copyright (c) 2007-2011 iMatix Corporation
+    Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
 
     This file is part of 0MQ.
 
     0MQ is free software; you can redistribute it and/or modify it under
-    the terms of the Lesser GNU General Public License as published by
+    the terms of the GNU Lesser General Public License as published by
     the Free Software Foundation; either version 3 of the License, or
     (at your option) any later version.
 
     0MQ is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    Lesser GNU General Public License for more details.
+    GNU Lesser General Public License for more details.
 
-    You should have received a copy of the Lesser GNU General Public License
+    You should have received a copy of the GNU Lesser General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
@@ -32,10 +33,7 @@
 #include "config.hpp"
 #include "err.hpp"
 
-zmq::zmq_engine_t::zmq_engine_t (io_thread_t *parent_, fd_t fd_,
-      const options_t &options_, bool reconnect_, 
-      const char *protocol_, const char *address_) :
-    io_object_t (parent_),
+zmq::zmq_engine_t::zmq_engine_t (fd_t fd_, const options_t &options_) :
     inpos (NULL),
     insize (0),
     decoder (in_batch_size),
@@ -43,14 +41,10 @@ zmq::zmq_engine_t::zmq_engine_t (io_thread_t *parent_, fd_t fd_,
     outsize (0),
     encoder (out_batch_size),
     inout (NULL),
+    ephemeral_inout (NULL),
     options (options_),
-    reconnect (reconnect_)
+    plugged (false)
 {
-    if (reconnect) {
-        protocol = protocol_;
-        address = address_;
-    }
-
     //  Initialise the underlying socket.
     int rc = tcp_socket.open (fd_, options.sndbuf, options.rcvbuf);
     zmq_assert (rc == 0);
@@ -58,33 +52,56 @@ zmq::zmq_engine_t::zmq_engine_t (io_thread_t *parent_, fd_t fd_,
 
 zmq::zmq_engine_t::~zmq_engine_t ()
 {
+    zmq_assert (!plugged);
 }
 
-void zmq::zmq_engine_t::plug (i_inout *inout_)
+void zmq::zmq_engine_t::plug (io_thread_t *io_thread_, i_inout *inout_)
 {
-    zmq_assert (!inout);
+    zmq_assert (!plugged);
+    plugged = true;
+    ephemeral_inout = NULL;
 
+    //  Connect to session/init object.
+    zmq_assert (!inout);
+    zmq_assert (inout_);
     encoder.set_inout (inout_);
     decoder.set_inout (inout_);
+    inout = inout_;
 
+    //  Connect to I/O threads poller object.
+    io_object_t::plug (io_thread_);
     handle = add_fd (tcp_socket.get_fd ());
     set_pollin (handle);
     set_pollout (handle);
 
-    inout = inout_;
-
     //  Flush all the data that may have been already received downstream.
     in_event ();
 }
 
 void zmq::zmq_engine_t::unplug ()
 {
+    zmq_assert (plugged);
+    plugged = false;
+
+    //  Cancel all fd subscriptions.
     rm_fd (handle);
+
+    //  Disconnect from I/O threads poller object.
+    io_object_t::unplug ();
+
+    //  Disconnect from init/session object.
     encoder.set_inout (NULL);
     decoder.set_inout (NULL);
+    ephemeral_inout = inout;
     inout = NULL;
 }
 
+void zmq::zmq_engine_t::terminate ()
+{
+    unplug ();
+    delete this;
+}
+
 void zmq::zmq_engine_t::in_event ()
 {
     bool disconnection = false;
@@ -106,23 +123,36 @@ void zmq::zmq_engine_t::in_event ()
     //  Push the data to the decoder.
     size_t processed = decoder.process_buffer (inpos, insize);
 
-    //  Stop polling for input if we got stuck.
-    if (processed < insize) {
-
-        //  This may happen if queue limits are in effect or when
-        //  init object reads all required information from the socket
-        //  and rejects to read more data.
-        reset_pollin (handle);
+    if (unlikely (processed == (size_t) -1)) {
+        disconnection = true;
     }
+    else {
+
+        //  Stop polling for input if we got stuck.
+        if (processed < insize) {
 
-    //  Adjust the buffer.
-    inpos += processed;
-    insize -= processed;
+            //  This may happen if queue limits are in effect or when
+            //  init object reads all required information from the socket
+            //  and rejects to read more data.
+            if (plugged)
+                reset_pollin (handle);
+        }
+
+        //  Adjust the buffer.
+        inpos += processed;
+        insize -= processed;
+    }
 
     //  Flush all messages the decoder may have produced.
-    inout->flush ();
+    //  If IO handler has unplugged engine, flush transient IO handler.
+    if (unlikely (!plugged)) {
+        zmq_assert (ephemeral_inout);
+        ephemeral_inout->flush ();
+    } else {
+        inout->flush ();
+    }
 
-    if (disconnection)
+    if (inout && disconnection)
         error ();
 }
 
@@ -133,7 +163,14 @@ void zmq::zmq_engine_t::out_event ()
 
         outpos = NULL;
         encoder.get_data (&outpos, &outsize);
-        
+
+        //  If IO handler has unplugged engine, flush transient IO handler.
+        if (unlikely (!plugged)) {
+            zmq_assert (ephemeral_inout);
+            ephemeral_inout->flush ();
+            return;
+        }
+
         //  If there is no data to send, stop polling for output.
         if (outsize == 0) {
             reset_pollout (handle);
@@ -155,7 +192,7 @@ void zmq::zmq_engine_t::out_event ()
     outsize -= nbytes;
 }
 
-void zmq::zmq_engine_t::revive ()
+void zmq::zmq_engine_t::activate_out ()
 {
     set_pollout (handle);
 
@@ -166,30 +203,18 @@ void zmq::zmq_engine_t::revive ()
     out_event ();
 }
 
-void zmq::zmq_engine_t::resume_input ()
+void zmq::zmq_engine_t::activate_in ()
 {
     set_pollin (handle);
 
+    //  Speculative read.
     in_event ();
 }
 
 void zmq::zmq_engine_t::error ()
 {
     zmq_assert (inout);
-
-    zmq_connecter_t *reconnecter = NULL;
-    if (reconnect) {
-
-        //  Create a connecter object to attempt reconnect.
-        //  Ask it to wait for a while before reconnecting.
-        reconnecter = new (std::nothrow) zmq_connecter_t (
-            inout->get_io_thread (), inout->get_owner (),
-            options, inout->get_ordinal (), true);
-        zmq_assert (reconnecter);
-        reconnecter->set_address (protocol.c_str(), address.c_str ());
-    }
-
-    inout->detach (reconnecter);
+    inout->detach ();
     unplug ();
     delete this;
 }
diff --git a/src/zmq_engine.hpp b/src/zmq_engine.hpp
index d89dccc..47073cc 100644
--- a/src/zmq_engine.hpp
+++ b/src/zmq_engine.hpp
@@ -1,19 +1,20 @@
 /*
-    Copyright (c) 2007-2010 iMatix Corporation
+    Copyright (c) 2007-2011 iMatix Corporation
+    Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
 
     This file is part of 0MQ.
 
     0MQ is free software; you can redistribute it and/or modify it under
-    the terms of the Lesser GNU General Public License as published by
+    the terms of the GNU Lesser General Public License as published by
     the Free Software Foundation; either version 3 of the License, or
     (at your option) any later version.
 
     0MQ is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    Lesser GNU General Public License for more details.
+    GNU Lesser General Public License for more details.
 
-    You should have received a copy of the Lesser GNU General Public License
+    You should have received a copy of the GNU Lesser General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
@@ -27,8 +28,8 @@
 #include "i_engine.hpp"
 #include "io_object.hpp"
 #include "tcp_socket.hpp"
-#include "zmq_encoder.hpp"
-#include "zmq_decoder.hpp"
+#include "encoder.hpp"
+#include "decoder.hpp"
 #include "options.hpp"
 
 namespace zmq
@@ -38,16 +39,15 @@ namespace zmq
     {
     public:
 
-        zmq_engine_t (class io_thread_t *parent_, fd_t fd_,
-            const options_t &options_, bool reconnect_, 
-            const char *protocol_, const char *address_);
+        zmq_engine_t (fd_t fd_, const options_t &options_);
         ~zmq_engine_t ();
 
         //  i_engine interface implementation.
-        void plug (struct i_inout *inout_);
+        void plug (class io_thread_t *io_thread_, struct i_inout *inout_);
         void unplug ();
-        void revive ();
-        void resume_input ();
+        void terminate ();
+        void activate_in ();
+        void activate_out ();
 
         //  i_poll_events interface implementation.
         void in_event ();
@@ -63,22 +63,23 @@ namespace zmq
 
         unsigned char *inpos;
         size_t insize;
-        zmq_decoder_t decoder;
+        decoder_t decoder;
 
         unsigned char *outpos;
         size_t outsize;
-        zmq_encoder_t encoder;
+        encoder_t encoder;
 
         i_inout *inout;
 
+        //  Detached transient inout handler.
+        i_inout *ephemeral_inout;
+
         options_t options;
 
-        bool reconnect;
-        std::string protocol;
-        std::string address;
+        bool plugged;
 
         zmq_engine_t (const zmq_engine_t&);
-        void operator = (const zmq_engine_t&);
+        const zmq_engine_t &operator = (const zmq_engine_t&);
     };
 
 }
diff --git a/src/zmq_init.cpp b/src/zmq_init.cpp
index 5824f5c..cf65d69 100644
--- a/src/zmq_init.cpp
+++ b/src/zmq_init.cpp
@@ -1,50 +1,56 @@
 /*
-    Copyright (c) 2007-2010 iMatix Corporation
+    Copyright (c) 2007-2011 iMatix Corporation
+    Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
 
     This file is part of 0MQ.
 
     0MQ is free software; you can redistribute it and/or modify it under
-    the terms of the Lesser GNU General Public License as published by
+    the terms of the GNU Lesser General Public License as published by
     the Free Software Foundation; either version 3 of the License, or
     (at your option) any later version.
 
     0MQ is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    Lesser GNU General Public License for more details.
+    GNU Lesser General Public License for more details.
 
-    You should have received a copy of the Lesser GNU General Public License
+    You should have received a copy of the GNU Lesser General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
 #include <string.h>
 
 #include "zmq_init.hpp"
+#include "transient_session.hpp"
+#include "named_session.hpp"
+#include "socket_base.hpp"
 #include "zmq_engine.hpp"
 #include "io_thread.hpp"
 #include "session.hpp"
 #include "uuid.hpp"
+#include "blob.hpp"
 #include "err.hpp"
 
-zmq::zmq_init_t::zmq_init_t (io_thread_t *parent_, socket_base_t *owner_,
-      fd_t fd_, const options_t &options_, bool reconnect_,
-      const char *protocol_, const char *address_, uint64_t session_ordinal_) :
-    owned_t (parent_, owner_),
+zmq::zmq_init_t::zmq_init_t (io_thread_t *io_thread_,
+      socket_base_t *socket_, session_t *session_, fd_t fd_,
+      const options_t &options_) :
+    own_t (io_thread_, options_),
+    ephemeral_engine (NULL),
     sent (false),
     received (false),
-    session_ordinal (session_ordinal_),
-    options (options_)
+    socket (socket_),
+    session (session_),
+    io_thread (io_thread_)
 {
     //  Create the engine object for this connection.
-    engine = new (std::nothrow) zmq_engine_t (parent_, fd_, options,
-        reconnect_, protocol_, address_);
-    zmq_assert (engine);
+    engine = new (std::nothrow) zmq_engine_t (fd_, options);
+    alloc_assert (engine);
 }
 
 zmq::zmq_init_t::~zmq_init_t ()
 {
     if (engine)
-        delete engine;
+        engine->terminate ();
 }
 
 bool zmq::zmq_init_t::read (::zmq_msg_t *msg_)
@@ -60,9 +66,8 @@ bool zmq::zmq_init_t::read (::zmq_msg_t *msg_)
         options.identity.size ());
     sent = true;
 
-    //  If initialisation is done, pass the engine to the session and
-    //  destroy the init object.
-    finalise ();
+    //  Try finalize initialization.
+    finalise_initialisation ();
 
     return true;
 }
@@ -85,9 +90,14 @@ bool zmq::zmq_init_t::write (::zmq_msg_t *msg_)
         peer_identity.assign ((const unsigned char*) zmq_msg_data (msg_),
             zmq_msg_size (msg_));
     }
+    int rc = zmq_msg_close (msg_);
+    zmq_assert (rc == 0);
 
     received = true;
 
+    //  Try finalize initialization.
+    finalise_initialisation ();
+
     return true;
 }
 
@@ -97,46 +107,30 @@ void zmq::zmq_init_t::flush ()
     if (!received)
         return;
 
-    //  If initialisation is done, pass the engine to the session and
-    //  destroy the init object.
-    finalise ();
+    //  Initialization is done, dispatch engine.
+    if (ephemeral_engine)
+        dispatch_engine ();
 }
 
-void zmq::zmq_init_t::detach (owned_t *reconnecter_)
+void zmq::zmq_init_t::detach ()
 {
     //  This function is called by engine when disconnection occurs.
 
-    //  If required, launch the reconnecter.
-    if (reconnecter_) {
-        send_plug (reconnecter_);
-        send_own (owner, reconnecter_);
-    }
+    //  If there is an associated session, send it a null engine to let it know
+    //  that connection process was unsuccesful.
+    if (session)
+        send_attach (session, NULL, blob_t (), true);
 
     //  The engine will destroy itself, so let's just drop the pointer here and
     //  start termination of the init object.
     engine = NULL;
-    term ();
-}
-
-zmq::io_thread_t *zmq::zmq_init_t::get_io_thread ()
-{
-    return choose_io_thread (options.affinity);
-}
-
-class zmq::socket_base_t *zmq::zmq_init_t::get_owner ()
-{
-    return owner;
-}
-
-uint64_t zmq::zmq_init_t::get_ordinal ()
-{
-    return session_ordinal;
+    terminate ();
 }
 
 void zmq::zmq_init_t::process_plug ()
 {
     zmq_assert (engine);
-    engine->plug (this);
+    engine->plug (io_thread, this);
 }
 
 void zmq::zmq_init_t::process_unplug ()
@@ -145,51 +139,78 @@ void zmq::zmq_init_t::process_unplug ()
         engine->unplug ();
 }
 
-void zmq::zmq_init_t::finalise ()
+void zmq::zmq_init_t::finalise_initialisation ()
+{
+     //  Unplug and prepare to dispatch engine.
+     if (sent && received) {
+        ephemeral_engine = engine;
+        engine = NULL;
+        ephemeral_engine->unplug ();
+        return;
+    }
+}
+
+void zmq::zmq_init_t::dispatch_engine ()
 {
     if (sent && received) {
 
-        //  Disconnect the engine from the init object.
-        engine->unplug ();
+        //  Engine must be detached.
+        zmq_assert (!engine);
+        zmq_assert (ephemeral_engine);
+
+        //  If we know what session we belong to, it's easy, just send the
+        //  engine to that session and destroy the init object. Note that we
+        //  know about the session only if this object is owned by it. Thus,
+        //  lifetime of this object in contained in the lifetime of the session
+        //  so the pointer cannot become invalid without notice.
+        if (session) {
+            send_attach (session, ephemeral_engine, peer_identity, true);
+            terminate ();
+            return;
+        }
 
-        session_t *session = NULL;
-        
-        //  If we have the session ordinal, let's use it to find the session.
-        //  If it is not found, it means socket is already being shut down
-        //  and the session have been deallocated.
-        //  TODO: We should check whether the name of the peer haven't changed
-        //  upon reconnection.
-        if (session_ordinal) {
-            session = owner->find_session (session_ordinal);
-            if (!session) {
-                term ();
-                return;
-            }
+        //  All the cases below are listener-based. Therefore we need the socket
+        //  reference so that new sessions can bind to that socket.
+        zmq_assert (socket);
+
+        //  We have no associated session. If the peer has no identity we'll
+        //  create a transient session for the connection. Note that
+        //  seqnum is incremented to account for attach command before the
+        //  session is launched. That way we are sure it won't terminate before
+        //  being attached.
+        if (peer_identity [0] == 0) {
+            session = new (std::nothrow) transient_session_t (io_thread,
+                socket, options);
+            alloc_assert (session);
+            session->inc_seqnum ();
+            launch_sibling (session);
+            send_attach (session, ephemeral_engine, peer_identity, false);
+            terminate ();
+            return;
         }
-        else {
-
-            //  If the peer has a unique name, find the associated session.
-            //  If it does not exist, create it.
-            zmq_assert (!peer_identity.empty ());
-            session = owner->find_session (peer_identity);
-            if (!session) {
-                session = new (std::nothrow) session_t (
-                    choose_io_thread (options.affinity), owner, options,
-                    peer_identity);
-                zmq_assert (session);
-                send_plug (session);
-                send_own (owner, session);
-
-                //  Reserve a sequence number for following 'attach' command.
-                session->inc_seqnum ();
-            }
+        
+        //  Try to find the session corresponding to the peer's identity.
+        //  If found, send the engine to that session and destroy this object.
+        //  Note that session's seqnum is incremented by find_session rather
+        //  than by send_attach.
+        session = socket->find_session (peer_identity);
+        if (session) {
+            send_attach (session, ephemeral_engine, peer_identity, false);
+            terminate ();
+            return;
         }
 
-        //  No need to increment seqnum as it was already incremented above.
-        send_attach (session, engine, peer_identity, false);
-
-        //  Destroy the init object.
-        engine = NULL;
-        term ();
+        //  There's no such named session. We have to create one. Note that
+        //  seqnum is incremented to account for attach command before the
+        //  session is launched. That way we are sure it won't terminate before
+        //  being attached.
+        session = new (std::nothrow) named_session_t (io_thread, socket,
+            options, peer_identity);
+        alloc_assert (session);
+        session->inc_seqnum ();
+        launch_sibling (session);
+        send_attach (session, ephemeral_engine, peer_identity, false);
+        terminate ();
+        return;
     }
 }
diff --git a/src/zmq_init.hpp b/src/zmq_init.hpp
index 6f935c2..d90915a 100644
--- a/src/zmq_init.hpp
+++ b/src/zmq_init.hpp
@@ -1,19 +1,20 @@
 /*
-    Copyright (c) 2007-2010 iMatix Corporation
+    Copyright (c) 2007-2011 iMatix Corporation
+    Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
 
     This file is part of 0MQ.
 
     0MQ is free software; you can redistribute it and/or modify it under
-    the terms of the Lesser GNU General Public License as published by
+    the terms of the GNU Lesser General Public License as published by
     the Free Software Foundation; either version 3 of the License, or
     (at your option) any later version.
 
     0MQ is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    Lesser GNU General Public License for more details.
+    GNU Lesser General Public License for more details.
 
-    You should have received a copy of the Lesser GNU General Public License
+    You should have received a copy of the GNU Lesser General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
@@ -22,10 +23,9 @@
 
 #include "i_inout.hpp"
 #include "i_engine.hpp"
-#include "owned.hpp"
+#include "own.hpp"
 #include "fd.hpp"
 #include "stdint.hpp"
-#include "options.hpp"
 #include "stdint.hpp"
 #include "blob.hpp"
 
@@ -34,54 +34,58 @@ namespace zmq
 
     //  The class handles initialisation phase of 0MQ wire-level protocol.
 
-    class zmq_init_t : public owned_t, public i_inout
+    class zmq_init_t : public own_t, public i_inout
     {
     public:
 
-        zmq_init_t (class io_thread_t *parent_, socket_base_t *owner_,
-            fd_t fd_, const options_t &options_, bool reconnect_,
-            const char *protocol_, const char *address_,
-            uint64_t session_ordinal_);
+        zmq_init_t (class io_thread_t *io_thread_, class socket_base_t *socket_,
+            class session_t *session_, fd_t fd_, const options_t &options_);
         ~zmq_init_t ();
 
     private:
 
-        void finalise ();
+        void finalise_initialisation ();
+        void dispatch_engine ();
 
         //  i_inout interface implementation.
         bool read (::zmq_msg_t *msg_);
         bool write (::zmq_msg_t *msg_);
         void flush ();
-        void detach (owned_t *reconnecter_);
-        class io_thread_t *get_io_thread ();
-        class socket_base_t *get_owner ();
-        uint64_t get_ordinal ();
+        void detach ();
 
         //  Handlers for incoming commands.
         void process_plug ();
         void process_unplug ();
 
-        //  Associated wite-protocol engine.
+        //  Associated wire-protocol engine.
         i_engine *engine;
 
+        //  Detached transient engine.
+        i_engine *ephemeral_engine;
+
         //  True if our own identity was already sent to the peer.
         bool sent;
 
         //  True if peer's identity was already received.
         bool received;
 
+        //  Socket the object belongs to.
+        class socket_base_t *socket;
+
+        //  Reference to the session the init object belongs to.
+        //  If the associated session is unknown and should be found
+        //  depending on peer identity this value is NULL.
+        class session_t *session;
+
         //  Identity of the peer socket.
         blob_t peer_identity;
 
-        //  TCP connecter creates session before the name of the peer is known.
-        //  Thus we know only its ordinal number.
-        uint64_t session_ordinal;
-
-        //  Associated socket options.
-        options_t options;
+        //  I/O thread the object is living in. It will be used to plug
+        //  the engine into the same I/O thread.
+        class io_thread_t *io_thread;
 
         zmq_init_t (const zmq_init_t&);
-        void operator = (const zmq_init_t&);
+        const zmq_init_t &operator = (const zmq_init_t&);
     };
 
 }
diff --git a/src/zmq_listener.cpp b/src/zmq_listener.cpp
index d7cf292..e3f3bd8 100644
--- a/src/zmq_listener.cpp
+++ b/src/zmq_listener.cpp
@@ -1,19 +1,20 @@
 /*
-    Copyright (c) 2007-2010 iMatix Corporation
+    Copyright (c) 2007-2011 iMatix Corporation
+    Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
 
     This file is part of 0MQ.
 
     0MQ is free software; you can redistribute it and/or modify it under
-    the terms of the Lesser GNU General Public License as published by
+    the terms of the GNU Lesser General Public License as published by
     the Free Software Foundation; either version 3 of the License, or
     (at your option) any later version.
 
     0MQ is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    Lesser GNU General Public License for more details.
+    GNU Lesser General Public License for more details.
 
-    You should have received a copy of the Lesser GNU General Public License
+    You should have received a copy of the GNU Lesser General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
@@ -24,11 +25,11 @@
 #include "io_thread.hpp"
 #include "err.hpp"
 
-zmq::zmq_listener_t::zmq_listener_t (io_thread_t *parent_,
-      socket_base_t *owner_, const options_t &options_) :
-    owned_t (parent_, owner_),
-    io_object_t (parent_),
-    options (options_)
+zmq::zmq_listener_t::zmq_listener_t (io_thread_t *io_thread_,
+      socket_base_t *socket_, const options_t &options_) :
+    own_t (io_thread_, options_),
+    io_object_t (io_thread_),
+    socket (socket_)
 {
 }
 
@@ -38,7 +39,7 @@ zmq::zmq_listener_t::~zmq_listener_t ()
 
 int zmq::zmq_listener_t::set_address (const char *protocol_, const char *addr_)
 {
-     return tcp_listener.set_address (protocol_, addr_);
+     return tcp_listener.set_address (protocol_, addr_, options.backlog);
 }
 
 void zmq::zmq_listener_t::process_plug ()
@@ -48,9 +49,10 @@ void zmq::zmq_listener_t::process_plug ()
     set_pollin (handle);
 }
 
-void zmq::zmq_listener_t::process_unplug ()
+void zmq::zmq_listener_t::process_term (int linger_)
 {
     rm_fd (handle);
+    own_t::process_term (linger_);
 }
 
 void zmq::zmq_listener_t::in_event ()
@@ -62,14 +64,15 @@ void zmq::zmq_listener_t::in_event ()
     if (fd == retired_fd)
         return;
 
-    //  Create an init object. 
+    //  Choose I/O thread to run connecter in. Given that we are already
+    //  running in an I/O thread, there must be at least one available.
     io_thread_t *io_thread = choose_io_thread (options.affinity);
-    zmq_init_t *init = new (std::nothrow) zmq_init_t (
-        io_thread, owner, fd, options, false, NULL, NULL, 0);
-    zmq_assert (init);
-    send_plug (init);
-    send_own (owner, init);
-}
-
+    zmq_assert (io_thread);
 
+    //  Create and launch an init object. 
+    zmq_init_t *init = new (std::nothrow) zmq_init_t (io_thread, socket,
+        NULL, fd, options);
+    alloc_assert (init);
+    launch_child (init);
+}
 
diff --git a/src/zmq_listener.hpp b/src/zmq_listener.hpp
index c990b02..82f4590 100644
--- a/src/zmq_listener.hpp
+++ b/src/zmq_listener.hpp
@@ -1,40 +1,40 @@
 /*
-    Copyright (c) 2007-2010 iMatix Corporation
+    Copyright (c) 2007-2011 iMatix Corporation
+    Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
 
     This file is part of 0MQ.
 
     0MQ is free software; you can redistribute it and/or modify it under
-    the terms of the Lesser GNU General Public License as published by
+    the terms of the GNU Lesser General Public License as published by
     the Free Software Foundation; either version 3 of the License, or
     (at your option) any later version.
 
     0MQ is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    Lesser GNU General Public License for more details.
+    GNU Lesser General Public License for more details.
 
-    You should have received a copy of the Lesser GNU General Public License
+    You should have received a copy of the GNU Lesser General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
 #ifndef __ZMQ_ZMQ_LISTENER_HPP_INCLUDED__
 #define __ZMQ_ZMQ_LISTENER_HPP_INCLUDED__
 
-#include "owned.hpp"
+#include "own.hpp"
 #include "io_object.hpp"
 #include "tcp_listener.hpp"
-#include "options.hpp"
 #include "stdint.hpp"
 
 namespace zmq
 {
 
-    class zmq_listener_t : public owned_t, public io_object_t
+    class zmq_listener_t : public own_t, public io_object_t
     {
     public:
 
-        zmq_listener_t (class io_thread_t *parent_, socket_base_t *owner_,
-            const options_t &options_);
+        zmq_listener_t (class io_thread_t *io_thread_,
+            class socket_base_t *socket_, const options_t &options_);
         ~zmq_listener_t ();
 
         //  Set address to listen on.
@@ -44,7 +44,7 @@ namespace zmq
 
         //  Handlers for incoming commands.
         void process_plug ();
-        void process_unplug ();
+        void process_term (int linger_);
 
         //  Handlers for I/O events.
         void in_event ();
@@ -55,11 +55,11 @@ namespace zmq
         //  Handle corresponding to the listening socket.
         handle_t handle;
 
-        //  Associated socket options.
-        options_t options;
+        //  Socket the listerner belongs to.
+        class socket_base_t *socket;
 
         zmq_listener_t (const zmq_listener_t&);
-        void operator = (const zmq_listener_t&);
+        const zmq_listener_t &operator = (const zmq_listener_t&);
     };
 
 }