Imported Upstream version 2.0.7.dfsgupstream/2.0.7.dfsg

123 files changed, 18804 insertions, 0 deletions

diff --git a/src/Makefile.am b/src/Makefile.am
new file mode 100644
index 0000000..fa97ca3
--- /dev/null
+++ b/src/Makefile.am
@@ -0,0 +1,244 @@
+lib_LTLIBRARIES = libzmq.la
+
+pkgconfigdir = $(libdir)/pkgconfig
+pkgconfig_DATA = libzmq.pc
+
+include_HEADERS = ../include/zmq.h ../include/zmq.hpp
+
+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 \
+    atomic_counter.hpp \
+    atomic_ptr.hpp \
+    blob.hpp \
+    command.hpp \
+    config.hpp \
+    ctx.hpp \
+    decoder.hpp \
+    devpoll.hpp \
+    downstream.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 \
+    msg_content.hpp \
+    mutex.hpp \
+    object.hpp \
+    options.hpp \
+    owned.hpp \
+    pgm_receiver.hpp \
+    pgm_sender.hpp \
+    pgm_socket.hpp \
+    pipe.hpp \
+    platform.hpp \
+    poll.hpp \
+    poller.hpp \
+    pair.hpp \
+    prefix_tree.hpp \
+    pub.hpp \
+    queue.hpp \
+    rep.hpp \
+    req.hpp \
+    select.hpp \
+    session.hpp \
+    signaler.hpp \
+    socket_base.hpp \
+    stdint.hpp \
+    streamer.hpp \
+    sub.hpp \
+    tcp_connecter.hpp \
+    tcp_listener.hpp \
+    tcp_socket.hpp \
+    thread.hpp \
+    upstream.hpp \
+    uuid.hpp \
+    windows.hpp \
+    wire.hpp \
+    xrep.hpp \
+    xreq.hpp \
+    yarray.hpp \
+    yarray_item.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 \
+    command.cpp \
+    ctx.cpp \
+    devpoll.cpp \
+    downstream.cpp \
+    epoll.cpp \
+    err.cpp \
+    forwarder.cpp \
+    fq.cpp \
+    io_object.cpp \
+    io_thread.cpp \
+    ip.cpp \
+    kqueue.cpp \
+    lb.cpp \
+    object.cpp \
+    options.cpp \
+    owned.cpp \
+    pgm_receiver.cpp \
+    pgm_sender.cpp \
+    pgm_socket.cpp \
+    pair.cpp \
+    prefix_tree.cpp \
+    pipe.cpp \
+    poll.cpp \
+    pub.cpp \
+    queue.cpp \
+    rep.cpp \
+    req.cpp \
+    select.cpp \
+    session.cpp \
+    signaler.cpp \
+    socket_base.cpp \
+    streamer.cpp \
+    sub.cpp \
+    tcp_connecter.cpp \
+    tcp_listener.cpp \
+    tcp_socket.cpp \
+    thread.cpp \
+    upstream.cpp \
+    uuid.cpp \
+    xrep.cpp \
+    xreq.cpp \
+    zmq.cpp \
+    zmq_connecter.cpp \
+    zmq_decoder.cpp \
+    zmq_encoder.cpp \
+    zmq_engine.cpp \
+    zmq_init.cpp \
+    zmq_listener.cpp
+
+if ON_MINGW
+libzmq_la_LDFLAGS = -no-undefined -avoid-version -version-info @LTVER@ @LIBZMQ_EXTRA_LDFLAGS@
+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@
+endif
+
+dist-hook:
+		-rm $(distdir)/platform.hpp
+
+
diff --git a/src/Makefile.in b/src/Makefile.in
new file mode 100644
index 0000000..bc3f00f
--- /dev/null
+++ b/src/Makefile.in
@@ -0,0 +1,1510 @@
+# Makefile.in generated by automake 1.10.1 from Makefile.am.
+# @configure_input@
+
+# Copyright (C) 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002,
+# 2003, 2004, 2005, 2006, 2007, 2008  Free Software Foundation, Inc.
+# This Makefile.in is free software; the Free Software Foundation
+# gives unlimited permission to copy and/or distribute it,
+# with or without modifications, as long as this notice is preserved.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY, to the extent permitted by law; without
+# even the implied warranty of MERCHANTABILITY or FITNESS FOR A
+# PARTICULAR PURPOSE.
+
+@SET_MAKE@
+
+
+
+VPATH = @srcdir@
+pkgdatadir = $(datadir)/@PACKAGE@
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+host_triplet = @host@
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+DIST_COMMON = $(include_HEADERS) $(srcdir)/Makefile.am \
+	$(srcdir)/Makefile.in $(srcdir)/libzmq.pc.in \
+	$(srcdir)/platform.hpp.in
+ACLOCAL_M4 = $(top_srcdir)/aclocal.m4
+am__aclocal_m4_deps = $(top_srcdir)/config/libtool.m4 \
+	$(top_srcdir)/config/ltoptions.m4 \
+	$(top_srcdir)/config/ltsugar.m4 \
+	$(top_srcdir)/config/ltversion.m4 \
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+	$(ACLOCAL_M4)
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+CONFIG_CLEAN_FILES = libzmq.pc
+am__vpath_adj_setup = srcdirstrip=`echo "$(srcdir)" | sed 's|.|.|g'`;
+am__vpath_adj = case $$p in \
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+    *) f=$$p;; \
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+am__strip_dir = `echo $$p | sed -e 's|^.*/||'`;
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+am_libzmq_la_OBJECTS = libzmq_la-app_thread.lo libzmq_la-command.lo \
+	libzmq_la-ctx.lo libzmq_la-devpoll.lo libzmq_la-downstream.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 \
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+	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-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-tcp_connecter.lo libzmq_la-tcp_listener.lo \
+	libzmq_la-tcp_socket.lo libzmq_la-thread.lo \
+	libzmq_la-upstream.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 \
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+@BUILD_PGM_TRUE@	libzmq_la-indextoaddr.lo \
+@BUILD_PGM_TRUE@	libzmq_la-indextoname.lo \
+@BUILD_PGM_TRUE@	libzmq_la-nametoindex.lo \
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+pkgconfigdir = $(libdir)/pkgconfig
+pkgconfig_DATA = libzmq.pc
+include_HEADERS = ../include/zmq.h ../include/zmq.hpp
+@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 \
+    atomic_counter.hpp \
+    atomic_ptr.hpp \
+    blob.hpp \
+    command.hpp \
+    config.hpp \
+    ctx.hpp \
+    decoder.hpp \
+    devpoll.hpp \
+    downstream.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 \
+    msg_content.hpp \
+    mutex.hpp \
+    object.hpp \
+    options.hpp \
+    owned.hpp \
+    pgm_receiver.hpp \
+    pgm_sender.hpp \
+    pgm_socket.hpp \
+    pipe.hpp \
+    platform.hpp \
+    poll.hpp \
+    poller.hpp \
+    pair.hpp \
+    prefix_tree.hpp \
+    pub.hpp \
+    queue.hpp \
+    rep.hpp \
+    req.hpp \
+    select.hpp \
+    session.hpp \
+    signaler.hpp \
+    socket_base.hpp \
+    stdint.hpp \
+    streamer.hpp \
+    sub.hpp \
+    tcp_connecter.hpp \
+    tcp_listener.hpp \
+    tcp_socket.hpp \
+    thread.hpp \
+    upstream.hpp \
+    uuid.hpp \
+    windows.hpp \
+    wire.hpp \
+    xrep.hpp \
+    xreq.hpp \
+    yarray.hpp \
+    yarray_item.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 \
+    command.cpp \
+    ctx.cpp \
+    devpoll.cpp \
+    downstream.cpp \
+    epoll.cpp \
+    err.cpp \
+    forwarder.cpp \
+    fq.cpp \
+    io_object.cpp \
+    io_thread.cpp \
+    ip.cpp \
+    kqueue.cpp \
+    lb.cpp \
+    object.cpp \
+    options.cpp \
+    owned.cpp \
+    pgm_receiver.cpp \
+    pgm_sender.cpp \
+    pgm_socket.cpp \
+    pair.cpp \
+    prefix_tree.cpp \
+    pipe.cpp \
+    poll.cpp \
+    pub.cpp \
+    queue.cpp \
+    rep.cpp \
+    req.cpp \
+    select.cpp \
+    session.cpp \
+    signaler.cpp \
+    socket_base.cpp \
+    streamer.cpp \
+    sub.cpp \
+    tcp_connecter.cpp \
+    tcp_listener.cpp \
+    tcp_socket.cpp \
+    thread.cpp \
+    upstream.cpp \
+    uuid.cpp \
+    xrep.cpp \
+    xreq.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@
+
+all: platform.hpp
+	$(MAKE) $(AM_MAKEFLAGS) all-am
+
+.SUFFIXES:
+.SUFFIXES: .c .cpp .lo .o .obj
+$(srcdir)/Makefile.in:  $(srcdir)/Makefile.am  $(am__configure_deps)
+	@for dep in $?; do \
+	  case '$(am__configure_deps)' in \
+	    *$$dep*) \
+	      cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh \
+		&& exit 0; \
+	      exit 1;; \
+	  esac; \
+	done; \
+	echo ' cd $(top_srcdir) && $(AUTOMAKE) --gnu  src/Makefile'; \
+	cd $(top_srcdir) && \
+	  $(AUTOMAKE) --gnu  src/Makefile
+.PRECIOUS: Makefile
+Makefile: $(srcdir)/Makefile.in $(top_builddir)/config.status
+	@case '$?' in \
+	  *config.status*) \
+	    cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh;; \
+	  *) \
+	    echo ' cd $(top_builddir) && $(SHELL) ./config.status $(subdir)/$@ $(am__depfiles_maybe)'; \
+	    cd $(top_builddir) && $(SHELL) ./config.status $(subdir)/$@ $(am__depfiles_maybe);; \
+	esac;
+
+$(top_builddir)/config.status: $(top_srcdir)/configure $(CONFIG_STATUS_DEPENDENCIES)
+	cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh
+
+$(top_srcdir)/configure:  $(am__configure_deps)
+	cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh
+$(ACLOCAL_M4):  $(am__aclocal_m4_deps)
+	cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh
+
+platform.hpp: stamp-h1
+	@if test ! -f $@; then \
+	  rm -f stamp-h1; \
+	  $(MAKE) $(AM_MAKEFLAGS) stamp-h1; \
+	else :; fi
+
+stamp-h1: $(srcdir)/platform.hpp.in $(top_builddir)/config.status
+	@rm -f stamp-h1
+	cd $(top_builddir) && $(SHELL) ./config.status src/platform.hpp
+$(srcdir)/platform.hpp.in:  $(am__configure_deps) 
+	cd $(top_srcdir) && $(AUTOHEADER)
+	rm -f stamp-h1
+	touch $@
+
+distclean-hdr:
+	-rm -f platform.hpp stamp-h1
+libzmq.pc: $(top_builddir)/config.status $(srcdir)/libzmq.pc.in
+	cd $(top_builddir) && $(SHELL) ./config.status $(subdir)/$@
+install-libLTLIBRARIES: $(lib_LTLIBRARIES)
+	@$(NORMAL_INSTALL)
+	test -z "$(libdir)" || $(MKDIR_P) "$(DESTDIR)$(libdir)"
+	@list='$(lib_LTLIBRARIES)'; for p in $$list; do \
+	  if test -f $$p; then \
+	    f=$(am__strip_dir) \
+	    echo " $(LIBTOOL) $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=install $(libLTLIBRARIES_INSTALL) $(INSTALL_STRIP_FLAG) '$$p' '$(DESTDIR)$(libdir)/$$f'"; \
+	    $(LIBTOOL) $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=install $(libLTLIBRARIES_INSTALL) $(INSTALL_STRIP_FLAG) "$$p" "$(DESTDIR)$(libdir)/$$f"; \
+	  else :; fi; \
+	done
+
+uninstall-libLTLIBRARIES:
+	@$(NORMAL_UNINSTALL)
+	@list='$(lib_LTLIBRARIES)'; for p in $$list; do \
+	  p=$(am__strip_dir) \
+	  echo " $(LIBTOOL) $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=uninstall rm -f '$(DESTDIR)$(libdir)/$$p'"; \
+	  $(LIBTOOL) $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=uninstall rm -f "$(DESTDIR)$(libdir)/$$p"; \
+	done
+
+clean-libLTLIBRARIES:
+	-test -z "$(lib_LTLIBRARIES)" || rm -f $(lib_LTLIBRARIES)
+	@list='$(lib_LTLIBRARIES)'; for p in $$list; do \
+	  dir="`echo $$p | sed -e 's|/[^/]*$$||'`"; \
+	  test "$$dir" != "$$p" || dir=.; \
+	  echo "rm -f \"$${dir}/so_locations\""; \
+	  rm -f "$${dir}/so_locations"; \
+	done
+libzmq.la: $(libzmq_la_OBJECTS) $(libzmq_la_DEPENDENCIES) 
+	$(libzmq_la_LINK) -rpath $(libdir) $(libzmq_la_OBJECTS) $(libzmq_la_LIBADD) $(LIBS)
+
+mostlyclean-compile:
+	-rm -f *.$(OBJEXT)
+
+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@./$(DEPDIR)/libzmq_la-command.Plo@am__quote@
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libzmq_la-ctx.Plo@am__quote@
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libzmq_la-devpoll.Plo@am__quote@
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libzmq_la-downstream.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@./$(DEPDIR)/libzmq_la-nametoindex.Plo@am__quote@
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libzmq_la-net.Plo@am__quote@
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libzmq_la-object.Plo@am__quote@
+@AMDEP_TRUE@@am__include@ @am__quote@./$(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@./$(DEPDIR)/libzmq_la-pair.Plo@am__quote@
+@AMDEP_TRUE@@am__include@ @am__quote@./$(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@./$(DEPDIR)/libzmq_la-pub.Plo@am__quote@
+@AMDEP_TRUE@@am__include@ @am__quote@./$(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@./$(DEPDIR)/libzmq_la-rep.Plo@am__quote@
+@AMDEP_TRUE@@am__include@ @am__quote@./$(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@
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libzmq_la-signaler.Plo@am__quote@
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libzmq_la-sockaddr.Plo@am__quote@
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libzmq_la-socket_base.Plo@am__quote@
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libzmq_la-source.Plo@am__quote@
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libzmq_la-streamer.Plo@am__quote@
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libzmq_la-sub.Plo@am__quote@
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libzmq_la-tcp_connecter.Plo@am__quote@
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libzmq_la-tcp_listener.Plo@am__quote@
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+	    if test -f "$$i"; then echo $$i; else echo $(srcdir)/$$i; fi; \
+	  done | \
+	  $(AWK) '{ files[$$0] = 1; nonemtpy = 1; } \
+	      END { if (nonempty) { for (i in files) print i; }; }'`; \
+	mkid -fID $$unique
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+
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+		$(TAGS_FILES) $(LISP)
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+	here=`pwd`; \
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+	    if test -f "$$i"; then echo $$i; else echo $(srcdir)/$$i; fi; \
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+	  test -n "$$unique" || unique=$$empty_fix; \
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+	fi
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+	  done | \
+	  $(AWK) '{ files[$$0] = 1; nonempty = 1; } \
+	      END { if (nonempty) { for (i in files) print i; }; }'`; \
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+	     $$tags $$unique
+
+GTAGS:
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+	  && cd $(top_srcdir) \
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+
+distdir: $(DISTFILES)
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+	  */*) $(MKDIR_P) `echo "$$dist_files" | \
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+	@echo "it deletes files that may require special tools to rebuild."
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+@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
+# Tell versions [3.59,3.63) of GNU make to not export all variables.
+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:
diff --git a/src/app_thread.cpp b/src/app_thread.cpp
new file mode 100644
index 0000000..fbf034c
--- /dev/null
+++ b/src/app_thread.cpp
@@ -0,0 +1,195 @@
+/*
+    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 "upstream.hpp"
+#include "downstream.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 certain time have elapsed since last command
+            //  processing.
+            if (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_UPSTREAM:
+        s = new (std::nothrow) upstream_t (this);
+        break;
+    case ZMQ_DOWNSTREAM:
+        s = new (std::nothrow) downstream_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
new file mode 100644
index 0000000..f0deaab
--- /dev/null
+++ b/src/app_thread.hpp
@@ -0,0 +1,88 @@
+/*
+    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/atomic_counter.hpp b/src/atomic_counter.hpp
new file mode 100644
index 0000000..b446627
--- /dev/null
+++ b/src/atomic_counter.hpp
@@ -0,0 +1,163 @@
+/*
+    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_ATOMIC_COUNTER_HPP_INCLUDED__
+#define __ZMQ_ATOMIC_COUNTER_HPP_INCLUDED__
+
+#include "stdint.hpp"
+#include "platform.hpp"
+
+#if defined ZMQ_FORCE_MUTEXES
+#define ZMQ_ATOMIC_COUNTER_MUTEX
+#elif (defined __i386__ || defined __x86_64__) && defined __GNUC__
+#define ZMQ_ATOMIC_COUNTER_X86
+#elif defined ZMQ_HAVE_WINDOWS
+#define ZMQ_ATOMIC_COUNTER_WINDOWS
+#elif (defined ZMQ_HAVE_SOLARIS || defined ZMQ_HAVE_NETBSD)
+#define ZMQ_ATOMIC_COUNTER_ATOMIC_H
+#else
+#define ZMQ_ATOMIC_COUNTER_MUTEX
+#endif
+
+#if defined ZMQ_ATOMIC_COUNTER_MUTEX
+#include "mutex.hpp"
+#elif defined ZMQ_ATOMIC_COUNTER_WINDOWS
+#include "windows.hpp"
+#elif defined ZMQ_ATOMIC_COUNTER_ATOMIC_H
+#include <atomic.h>
+#endif
+
+namespace zmq
+{
+
+    //  This class represents an integer that can be incremented/decremented
+    //  in atomic fashion.
+
+    class atomic_counter_t
+    {
+    public:
+
+        typedef uint32_t integer_t;
+
+        inline atomic_counter_t (integer_t value_ = 0) :
+            value (value_)
+        {
+        }
+
+        inline ~atomic_counter_t ()
+        {
+        }
+
+        //  Set counter value (not thread-safe).
+        inline void set (integer_t value_)
+        {
+            value = value_;
+        }
+
+        //  Atomic addition. Returns the old value.
+        inline integer_t add (integer_t increment_)
+        {
+            integer_t old_value;
+
+#if defined ZMQ_ATOMIC_COUNTER_WINDOWS
+            old_value = InterlockedExchangeAdd ((LONG*) &value, increment_);
+#elif defined ZMQ_ATOMIC_COUNTER_ATOMIC_H
+            integer_t new_value = atomic_add_32_nv (&value, increment_);
+            old_value = new_value - increment_;
+#elif defined ZMQ_ATOMIC_COUNTER_X86
+            __asm__ volatile (
+                "lock; xadd %0, %1 \n\t"
+                : "=r" (old_value), "=m" (value)
+                : "0" (increment_), "m" (value)
+                : "cc", "memory");
+#elif defined ZMQ_ATOMIC_COUNTER_MUTEX
+            sync.lock ();
+            old_value = value;
+            value += increment_;
+            sync.unlock ();
+#else
+#error atomic_counter is not implemented for this platform
+#endif
+            return old_value;
+        }
+
+        //  Atomic subtraction. Returns false if the counter drops to zero.
+        inline bool sub (integer_t decrement)
+        {
+#if defined ZMQ_ATOMIC_COUNTER_WINDOWS
+            LONG delta = - ((LONG) decrement);
+            integer_t old = InterlockedExchangeAdd ((LONG*) &value, delta);
+            return old - decrement != 0;
+#elif defined ZMQ_ATOMIC_COUNTER_ATOMIC_H
+            int32_t delta = - ((int32_t) decrement);
+            integer_t nv = atomic_add_32_nv (&value, delta);
+            return nv != 0;
+#elif defined ZMQ_ATOMIC_COUNTER_X86
+            integer_t oldval = -decrement;
+            volatile integer_t *val = &value;
+            __asm__ volatile ("lock; xaddl %0,%1"
+                : "=r" (oldval), "=m" (*val)
+                : "0" (oldval), "m" (*val)
+                : "cc", "memory");
+            return oldval != decrement;
+#elif defined ZMQ_ATOMIC_COUNTER_MUTEX
+            sync.lock ();
+            value -= decrement;
+            bool result = value ? true : false;
+            sync.unlock ();
+            return result;
+#else
+#error atomic_counter is not implemented for this platform
+#endif
+        }
+
+        inline integer_t get ()
+        {
+            return value;
+        }
+
+    private:
+
+        volatile integer_t value;
+#if defined ZMQ_ATOMIC_COUNTER_MUTEX
+        mutex_t sync;
+#endif
+
+        atomic_counter_t (const atomic_counter_t&);
+        void operator = (const atomic_counter_t&);
+    };
+
+}
+
+//  Remove macros local to this file.
+#if defined ZMQ_ATOMIC_COUNTER_WINDOWS
+#undef ZMQ_ATOMIC_COUNTER_WINDOWS
+#endif
+#if defined ZMQ_ATOMIC_COUNTER_ATOMIC_H
+#undef ZMQ_ATOMIC_COUNTER_ATOMIC_H
+#endif
+#if defined ZMQ_ATOMIC_COUNTER_X86
+#undef ZMQ_ATOMIC_COUNTER_X86
+#endif
+#if defined ZMQ_ATOMIC_COUNTER_MUTEX
+#undef ZMQ_ATOMIC_COUNTER_MUTEX
+#endif
+
+#endif
+
diff --git a/src/atomic_ptr.hpp b/src/atomic_ptr.hpp
new file mode 100644
index 0000000..54db64f
--- /dev/null
+++ b/src/atomic_ptr.hpp
@@ -0,0 +1,158 @@
+/*
+    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_ATOMIC_PTR_HPP_INCLUDED__
+#define __ZMQ_ATOMIC_PTR_HPP_INCLUDED__
+
+#include "platform.hpp"
+
+#if defined ZMQ_FORCE_MUTEXES
+#define ZMQ_ATOMIC_PTR_MUTEX
+#elif (defined __i386__ || defined __x86_64__) && defined __GNUC__
+#define ZMQ_ATOMIC_PTR_X86
+#elif defined ZMQ_HAVE_WINDOWS
+#define ZMQ_ATOMIC_PTR_WINDOWS
+#elif (defined ZMQ_HAVE_SOLARIS || defined ZMQ_HAVE_NETBSD)
+#define ZMQ_ATOMIC_PTR_ATOMIC_H
+#else
+#define ZMQ_ATOMIC_PTR_MUTEX
+#endif
+
+#if defined ZMQ_ATOMIC_PTR_MUTEX
+#include "mutex.hpp"
+#elif defined ZMQ_ATOMIC_PTR_WINDOWS
+#include "windows.hpp"
+#elif defined ZMQ_ATOMIC_PTR_ATOMIC_H
+#include <atomic.h>
+#endif
+
+namespace zmq
+{
+
+    //  This class encapsulates several atomic operations on pointers.
+
+    template <typename T> class atomic_ptr_t
+    {
+    public:
+
+        //  Initialise atomic pointer
+        inline atomic_ptr_t ()
+        {
+            ptr = NULL;
+        }
+
+        //  Destroy atomic pointer
+        inline ~atomic_ptr_t ()
+        {
+        }
+
+        //  Set value of atomic pointer in a non-threadsafe way
+        //  Use this function only when you are sure that at most one
+        //  thread is accessing the pointer at the moment.
+        inline void set (T *ptr_)
+        {
+            this->ptr = ptr_;
+        }
+
+        //  Perform atomic 'exchange pointers' operation. Pointer is set
+        //  to the 'val' value. Old value is returned.
+        inline T *xchg (T *val_)
+        {
+#if defined ZMQ_ATOMIC_PTR_WINDOWS
+            return (T*) InterlockedExchangePointer ((PVOID*) &ptr, val_);
+#elif defined ZMQ_ATOMIC_PTR_ATOMIC_H
+            return (T*) atomic_swap_ptr (&ptr, val_);
+#elif defined ZMQ_ATOMIC_PTR_X86
+            T *old;
+            __asm__ volatile (
+                "lock; xchg %0, %2"
+                : "=r" (old), "=m" (ptr)
+                : "m" (ptr), "0" (val_));
+            return old;
+#elif defined ZMQ_ATOMIC_PTR_MUTEX
+            sync.lock ();
+            T *old = (T*) ptr;
+            ptr = val_;
+            sync.unlock ();
+            return old;
+#else
+#error atomic_ptr is not implemented for this platform
+#endif
+        }
+
+        //  Perform atomic 'compare and swap' operation on the pointer.
+        //  The pointer is compared to 'cmp' argument and if they are
+        //  equal, its value is set to 'val'. Old value of the pointer
+        //  is returned.
+        inline T *cas (T *cmp_, T *val_)
+        {
+#if defined ZMQ_ATOMIC_PTR_WINDOWS
+            return (T*) InterlockedCompareExchangePointer (
+                (volatile PVOID*) &ptr, val_, cmp_);
+#elif defined ZMQ_ATOMIC_PTR_ATOMIC_H
+            return (T*) atomic_cas_ptr (&ptr, cmp_, val_);
+#elif defined ZMQ_ATOMIC_PTR_X86
+            T *old;
+            __asm__ volatile (
+                "lock; cmpxchg %2, %3"
+                : "=a" (old), "=m" (ptr)
+                : "r" (val_), "m" (ptr), "0" (cmp_)
+                : "cc");
+            return old;
+#elif defined ZMQ_ATOMIC_PTR_MUTEX
+            sync.lock ();
+            T *old = (T*) ptr;
+            if (ptr == cmp_)
+                ptr = val_;
+            sync.unlock ();
+            return old;
+#else
+#error atomic_ptr is not implemented for this platform
+#endif
+        }
+
+    private:
+
+        volatile T *ptr;
+#if defined ZMQ_ATOMIC_PTR_MUTEX
+        mutex_t sync;
+#endif
+
+        atomic_ptr_t (const atomic_ptr_t&);
+        void operator = (const atomic_ptr_t&);
+    };
+
+}
+
+//  Remove macros local to this file.
+#if defined ZMQ_ATOMIC_PTR_WINDOWS
+#undef ZMQ_ATOMIC_PTR_WINDOWS
+#endif
+#if defined ZMQ_ATOMIC_PTR_ATOMIC_H
+#undef ZMQ_ATOMIC_PTR_ATOMIC_H
+#endif
+#if defined ZMQ_ATOMIC_PTR_X86
+#undef ZMQ_ATOMIC_PTR_X86
+#endif
+#if defined ZMQ_ATOMIC_PTR_MUTEX
+#undef ZMQ_ATOMIC_PTR_MUTEX
+#endif
+
+#endif
+
diff --git a/src/blob.hpp b/src/blob.hpp
new file mode 100644
index 0000000..a4fa8cd
--- /dev/null
+++ b/src/blob.hpp
@@ -0,0 +1,33 @@
+/*
+    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_BLOB_HPP_INCLUDED__
+#define __ZMQ_BLOB_HPP_INCLUDED__
+
+#include <string>
+
+namespace zmq
+{
+
+    //  Object to hold dynamically allocated opaque binary data.
+    typedef std::basic_string <unsigned char> blob_t;
+
+}
+
+#endif
diff --git a/src/command.cpp b/src/command.cpp
new file mode 100644
index 0000000..8bf7ea2
--- /dev/null
+++ b/src/command.cpp
@@ -0,0 +1,38 @@
+/*
+    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 <stdlib.h>
+
+#include "command.hpp"
+
+void zmq::deallocate_command (command_t *cmd_)
+{
+    switch (cmd_->type) {
+    case command_t::attach:
+        if (cmd_->args.attach.peer_identity)
+            free (cmd_->args.attach.peer_identity);
+        break;
+    case command_t::bind:
+        if (cmd_->args.bind.peer_identity)
+            free (cmd_->args.bind.peer_identity);
+        break;
+    default:
+        /*  noop  */;
+    }
+}
diff --git a/src/command.hpp b/src/command.hpp
new file mode 100644
index 0000000..3d00cd7
--- /dev/null
+++ b/src/command.hpp
@@ -0,0 +1,127 @@
+/*
+    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_COMMAND_HPP_INCLUDED__
+#define __ZMQ_COMMAND_HPP_INCLUDED__
+
+#include "stdint.hpp"
+
+namespace zmq
+{
+
+    //  This structure defines the commands that can be sent between threads.
+
+    struct command_t
+    {
+        //  Object to process the command.
+        class object_t *destination;
+
+        enum type_t
+        {
+            stop,
+            plug,
+            own,
+            attach,
+            bind,
+            revive,
+            reader_info,
+            pipe_term,
+            pipe_term_ack,
+            term_req,
+            term,
+            term_ack
+        } type;
+
+        union {
+
+            //  Sent to I/O thread to let it know that it should
+            //  terminate itself.
+            struct {
+            } stop;
+
+            //  Sent to I/O object to make it register with its I/O thread.
+            struct {
+            } plug;
+
+            //  Sent to socket to let it know about the newly created object.
+            struct {
+                class owned_t *object;
+            } own;
+
+            //  Attach the engine to the session.
+            struct {
+                struct i_engine *engine;
+                unsigned char peer_identity_size;
+                unsigned char *peer_identity;
+            } attach;
+
+            //  Sent from session to socket to establish pipe(s) between them.
+            //  Caller have used inc_seqnum beforehand sending the command.
+            struct {
+                class reader_t *in_pipe;
+                class writer_t *out_pipe;
+                unsigned char peer_identity_size;
+                unsigned char *peer_identity;
+            } bind;
+
+            //  Sent by pipe writer to inform dormant pipe reader that there
+            //  are messages in the pipe.
+            struct {
+            } revive;
+
+            //  Sent by pipe reader to inform pipe writer
+            //  about how many messages it has read so far.
+            //  Used to implement the flow control.
+            struct {
+                uint64_t msgs_read;
+            } reader_info;
+
+            //  Sent by pipe reader to pipe writer to ask it to terminate
+            //  its end of the pipe.
+            struct {
+            } pipe_term;
+
+            //  Pipe writer acknowledges pipe_term command.
+            struct {
+            } pipe_term_ack;
+
+            //  Sent by I/O object ot the socket to request the shutdown of
+            //  the I/O object.
+            struct {
+                class owned_t *object;
+            } term_req;
+
+            //  Sent by socket to I/O object to start its shutdown.
+            struct {
+            } term;
+
+            //  Sent by I/O object to the socket to acknowledge it has
+            //  shut down.
+            struct {
+            } term_ack;
+
+        } args;
+    };
+
+    //  Function to deallocate dynamically allocated components of the command.
+    void deallocate_command (command_t *cmd_);
+
+}    
+
+#endif
diff --git a/src/config.hpp b/src/config.hpp
new file mode 100644
index 0000000..2c0ac2d
--- /dev/null
+++ b/src/config.hpp
@@ -0,0 +1,86 @@
+/*
+    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_CONFIG_HPP_INCLUDED__
+#define __ZMQ_CONFIG_HPP_INCLUDED__
+
+namespace zmq
+{
+
+    //  Compile-time settings.
+
+    enum 
+    {
+        //  Maximal number of OS threads that can own 0MQ sockets
+        //  at the same time.
+        max_app_threads = 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.
+        //  If there are no unprocessed messages available, poll is done
+        //  immediately. Decreasing the value trades overall latency for more
+        //  real-time behaviour (less latency peaks).
+        inbound_poll_rate = 100,
+
+        //  Maximal batching size for engines with receiving functionality.
+        //  So, if there are 10 messages that fit into the batch size, all of
+        //  them may be read by a single 'recv' system call, thus avoiding
+        //  unnecessary network stack traversals.
+        in_batch_size = 8192,
+
+        //  Maximal batching size for engines with sending functionality.
+        //  So, if there are 10 messages that fit into the batch size, all of
+        //  them may be written by a single 'send' system call, thus avoiding
+        //  unnecessary network stack traversals.
+        out_batch_size = 8192,
+
+        //  Maximal delta between high and low watermark.
+        max_wm_delta = 1024,
+
+        //  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.
+        max_command_delay = 3000000,
+
+        //  Maximal number of non-accepted connections that can be held by
+        //  TCP listener object.
+        tcp_connection_backlog = 10,
+
+        //  Maximum transport data unit size for PGM (TPDU).
+        pgm_max_tpdu = 1500
+    };
+
+}
+
+#endif
diff --git a/src/ctx.cpp b/src/ctx.cpp
new file mode 100644
index 0000000..f0e177d
--- /dev/null
+++ b/src/ctx.cpp
@@ -0,0 +1,316 @@
+/*
+    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 <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 "err.hpp"
+#include "pipe.hpp"
+
+#if defined ZMQ_HAVE_WINDOWS
+#include "windows.h"
+#endif
+
+zmq::ctx_t::ctx_t (uint32_t io_threads_) :
+    sockets (0),
+    terminated (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
+
+    //  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);
+
+    //  Create I/O thread objects and launch them.
+    for (uint32_t i = 0; i != io_threads_; i++) {
+        io_thread_t *io_thread = new (std::nothrow) io_thread_t (this, i);
+        zmq_assert (io_thread);
+        io_threads.push_back (io_thread);
+        signalers [i] = io_thread->get_signaler ();
+        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;
+
+    return 0;
+}
+
+zmq::ctx_t::~ctx_t ()
+{
+    //  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++)
+        io_threads [i]->stop ();
+
+    //  Wait till I/O threads actually terminate.
+    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
+}
+
+zmq::socket_base_t *zmq::ctx_t::create_socket (int type_)
+{
+    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;
+    }
+
+    //  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 ()) {
+
+        //  If all the existing app_threads are already used, create one more.
+        if (unused == app_threads.size ()) {
+
+            //  If max_app_threads limit was reached, return error.
+            if (app_threads.size () == max_app_threads) {
+                app_threads_sync.unlock ();
+                errno = EMTHREAD;
+                return NULL;
+            }
+
+            //  Create the new application thread proxy object.
+            app_thread_info_t 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);
+        }
+
+        //  Incidentally, this works both when there is an unused app_thread
+        //  and when a new one is created.
+        current = unused;
+
+        //  Associate the selected app_thread with the OS thread.
+        app_threads [current].associated = true;
+        app_threads [current].tid = thread_t::id ();
+    }
+
+    app_thread_t *thread = app_threads [current].app_thread;
+    app_threads_sync.unlock ();
+
+    socket_base_t *s = thread->create_socket (type_);
+    if (!s)
+        return NULL;
+
+    term_sync.lock ();
+    sockets++;
+    term_sync.unlock ();
+
+    return s;
+}
+
+void zmq::ctx_t::destroy_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;
+}
+
+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 ();
+}
+
+void zmq::ctx_t::send_command (uint32_t destination_,
+    const command_t &command_)
+{
+    signalers [destination_]->send (command_);
+}
+
+bool zmq::ctx_t::recv_command (uint32_t thread_slot_,
+    command_t *command_, bool block_)
+{
+    return signalers [thread_slot_]->recv (command_, block_);
+}
+
+zmq::io_thread_t *zmq::ctx_t::choose_io_thread (uint64_t affinity_)
+{
+    //  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++) {
+        if (!affinity_ || (affinity_ & (uint64_t (1) << i))) {
+            int load = io_threads [i]->get_load ();
+            if (min_load == -1 || load < min_load) {
+                min_load = load;
+                result = i;
+            }
+        }
+    }
+    zmq_assert (min_load != -1);
+    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_)
+{
+    endpoints_sync.lock ();
+
+    bool inserted = endpoints.insert (std::make_pair (std::string (addr_),
+        socket_)).second;
+    if (!inserted) {
+        errno = EADDRINUSE;
+        endpoints_sync.unlock ();
+        return -1;
+    }
+
+    endpoints_sync.unlock ();
+    return 0;
+}
+
+void zmq::ctx_t::unregister_endpoints (socket_base_t *socket_)
+{
+    endpoints_sync.lock ();
+
+    endpoints_t::iterator it = endpoints.begin ();
+    while (it != endpoints.end ()) {
+        if (it->second == socket_) {
+            endpoints_t::iterator to_erase = it;
+            it++;
+            endpoints.erase (to_erase);
+            continue;
+        }
+        it++;
+    }
+        
+    endpoints_sync.unlock ();
+}
+
+zmq::socket_base_t *zmq::ctx_t::find_endpoint (const char *addr_)
+{
+     endpoints_sync.lock ();
+
+     endpoints_t::iterator it = endpoints.find (addr_);
+     if (it == endpoints.end ()) {
+         endpoints_sync.unlock ();
+         errno = ECONNREFUSED;
+         return NULL;
+     }
+     socket_base_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 ();
+
+     endpoints_sync.unlock ();
+     return endpoint;
+}
+
diff --git a/src/ctx.hpp b/src/ctx.hpp
new file mode 100644
index 0000000..c96a923
--- /dev/null
+++ b/src/ctx.hpp
@@ -0,0 +1,156 @@
+/*
+    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_CTX_HPP_INCLUDED__
+#define __ZMQ_CTX_HPP_INCLUDED__
+
+#include <vector>
+#include <set>
+#include <map>
+#include <string>
+
+#include "signaler.hpp"
+#include "ypipe.hpp"
+#include "config.hpp"
+#include "mutex.hpp"
+#include "stdint.hpp"
+#include "thread.hpp"
+
+namespace zmq
+{
+
+    //  Context object encapsulates all the global state associated with
+    //  the library.
+    
+    class ctx_t
+    {
+    public:
+
+        //  Create the context object. The argument specifies the size
+        //  of I/O thread pool to create.
+        ctx_t (uint32_t io_threads_);
+
+        //  This function is called when user invokes zmq_term. If there are
+        //  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 ();
+
+        //  Create 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_);
+
+        //  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_);
+
+        //  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_);
+
+        //  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_);
+
+        //  Management of inproc endpoints.
+        int register_endpoint (const char *addr_, class socket_base_t *socket_);
+        void unregister_endpoints (class socket_base_t *socket_);
+        class socket_base_t *find_endpoint (const char *addr_);
+
+    private:
+
+        ~ctx_t ();
+
+        struct app_thread_info_t
+        {
+            //  If false, 0MQ application thread is free, there's no associated
+            //  OS thread.
+            bool associated;
+
+            //  ID of the associated OS thread. If 'associated' is false,
+            //  this field contains bogus data.
+            thread_t::id_t tid;
+
+            //  Pointer to the 0MQ application thread object.
+            class app_thread_t *app_thread;
+        };
+
+        //  Application threads.
+        typedef std::vector <app_thread_info_t> app_threads_t;
+        app_threads_t app_threads;
+
+        //  Synchronisation of accesses to shared application thread data.
+        mutex_t app_threads_sync;
+
+        //  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;
+
+        //  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;
+
+        //  List of inproc endpoints within this context.
+        typedef std::map <std::string, class socket_base_t*> endpoints_t;
+        endpoints_t endpoints;
+
+        //  Synchronisation of access to the list of inproc endpoints.
+        mutex_t endpoints_sync;
+
+        ctx_t (const ctx_t&);
+        void operator = (const ctx_t&);
+    };
+    
+}
+
+#endif
+
diff --git a/src/decoder.hpp b/src/decoder.hpp
new file mode 100644
index 0000000..1662bda
--- /dev/null
+++ b/src/decoder.hpp
@@ -0,0 +1,156 @@
+/*
+    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_DECODER_HPP_INCLUDED__
+#define __ZMQ_DECODER_HPP_INCLUDED__
+
+#include <stddef.h>
+#include <string.h>
+#include <stdlib.h>
+#include <algorithm>
+
+#include "err.hpp"
+
+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.
+    //
+    //  Decoder implements the state machine that parses the incoming buffer.
+    //  Derived class should implement individual state machine actions.
+
+    template <typename T> class decoder_t
+    {
+    public:
+
+        inline decoder_t (size_t bufsize_) :
+            read_pos (NULL),
+            to_read (0),
+            next (NULL),
+            bufsize (bufsize_)
+        {
+            buf = (unsigned char*) malloc (bufsize_);
+            zmq_assert (buf);
+        }
+
+        inline ~decoder_t ()
+        {
+            free (buf);
+        }
+
+        //  Returns a buffer to be filled with binary data.
+        inline void get_buffer (unsigned char **data_, size_t *size_)
+        {
+            //  If we are expected to read large message, we'll opt for zero-
+            //  copy, i.e. we'll ask caller to fill the data directly to the
+            //  message. Note that subsequent read(s) are non-blocking, thus
+            //  each single read reads at most SO_RCVBUF bytes at once not
+            //  depending on how large is the chunk returned from here.
+            //  As a consequence, large messages being received won't block
+            //  other engines running in the same I/O thread for excessive
+            //  amounts of time.
+            if (to_read >= bufsize) {
+                *data_ = read_pos;
+                *size_ = to_read;
+                return;
+            }
+
+            *data_ = buf;
+            *size_ = bufsize;
+        }
+
+        //  Processes the data in the buffer previously allocated using
+        //  get_buffer function. size_ argument specifies nemuber of bytes
+        //  actually filled into the buffer. Function returns number of
+        //  bytes actually processed.
+        inline size_t process_buffer (unsigned char *data_, size_t size_)
+        {
+            //  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.
+            if (data_ == read_pos) {
+                read_pos += size_;
+                to_read -= size_;
+
+                while (!to_read)
+                    if (!(static_cast <T*> (this)->*next) ())
+                        return size_;
+                return size_;
+            }
+
+            size_t pos = 0;
+            while (true) {
+
+                //  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) ())
+                        return pos;
+
+                //  If there are no more data in the buffer, return.
+                if (pos == size_)
+                    return pos;
+
+                //  Copy the data from buffer to the message.
+                size_t to_copy = std::min (to_read, size_ - pos);
+                memcpy (read_pos, data_ + pos, to_copy);
+                read_pos += to_copy;
+                pos += to_copy;
+                to_read -= to_copy;
+            }
+        }
+
+    protected:
+
+        //  Prototype of state machine action. Action should return false if
+        //  it is unable to push the data to the system.
+        typedef bool (T::*step_t) ();
+
+        //  This function should be called from derived class to read data
+        //  from the buffer and schedule next state machine action.
+        inline void next_step (void *read_pos_, size_t to_read_,
+            step_t next_)
+        {
+            read_pos = (unsigned char*) read_pos_;
+            to_read = to_read_;
+            next = next_;
+        }
+
+    private:
+
+        unsigned char *read_pos;
+        size_t to_read;
+        step_t next;
+
+        size_t bufsize;
+        unsigned char *buf;
+
+        decoder_t (const decoder_t&);
+        void operator = (const decoder_t&);
+    };
+
+}
+
+#endif
diff --git a/src/devpoll.cpp b/src/devpoll.cpp
new file mode 100644
index 0000000..003f465
--- /dev/null
+++ b/src/devpoll.cpp
@@ -0,0 +1,222 @@
+/*
+    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 "platform.hpp"
+
+#if defined ZMQ_HAVE_SOLARIS || defined ZMQ_HAVE_HPUX
+
+#include <sys/devpoll.h>
+#include <sys/time.h>
+#include <sys/resource.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/ioctl.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <limits.h>
+#include <algorithm>
+
+#include "devpoll.hpp"
+#include "err.hpp"
+#include "config.hpp"
+#include "i_poll_events.hpp"
+
+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);
+}
+
+zmq::devpoll_t::~devpoll_t ()
+{
+    worker.stop ();
+
+    //  Make sure there are no fds registered on shutdown.
+    zmq_assert (load.get () == 0);
+
+    close (devpoll_fd);
+}
+
+void zmq::devpoll_t::devpoll_ctl (fd_t fd_, short events_)
+{
+    struct pollfd pfd = {fd_, events_, 0};
+    ssize_t rc = write (devpoll_fd, &pfd, sizeof pfd);
+    zmq_assert (rc == sizeof pfd);
+}
+
+zmq::devpoll_t::handle_t zmq::devpoll_t::add_fd (fd_t fd_,
+    i_poll_events *reactor_)
+{
+    assert (!fd_table [fd_].valid);
+
+    fd_table [fd_].events = 0;
+    fd_table [fd_].reactor = reactor_;
+    fd_table [fd_].valid = true;
+    fd_table [fd_].accepted = false;
+
+    devpoll_ctl (fd_, 0);
+    pending_list.push_back (fd_);
+
+    //  Increase the load metric of the thread.
+    load.add (1);
+
+    return fd_;
+}
+
+void zmq::devpoll_t::rm_fd (handle_t handle_)
+{
+    assert (fd_table [handle_].valid);
+
+    devpoll_ctl (handle_, POLLREMOVE);
+    fd_table [handle_].valid = false;
+
+    //  Decrease the load metric of the thread.
+    load.sub (1);
+}
+
+void zmq::devpoll_t::set_pollin (handle_t handle_)
+{
+    devpoll_ctl (handle_, POLLREMOVE);
+    fd_table [handle_].events |= POLLIN;
+    devpoll_ctl (handle_, fd_table [handle_].events);
+}
+
+void zmq::devpoll_t::reset_pollin (handle_t handle_)
+{
+    devpoll_ctl (handle_, POLLREMOVE);
+    fd_table [handle_].events &= ~((short) POLLIN);
+    devpoll_ctl (handle_, fd_table [handle_].events);
+}
+
+void zmq::devpoll_t::set_pollout (handle_t handle_)
+{
+    devpoll_ctl (handle_, POLLREMOVE);
+    fd_table [handle_].events |= POLLOUT;
+    devpoll_ctl (handle_, fd_table [handle_].events);
+}
+
+void zmq::devpoll_t::reset_pollout (handle_t handle_)
+{
+    devpoll_ctl (handle_, POLLREMOVE);
+    fd_table [handle_].events &= ~((short) POLLOUT);
+    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);
+}
+
+void zmq::devpoll_t::stop ()
+{
+    stopping = true;
+}
+
+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];
+        struct dvpoll poll_req;
+
+        for (pending_list_t::size_type i = 0; i < pending_list.size (); i ++)
+            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;
+
+        //  Wait for events.
+        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];
+            if (!fd_ptr->valid || !fd_ptr->accepted)
+                continue;
+            if (ev_buf [i].revents & (POLLERR | POLLHUP))
+                fd_ptr->reactor->in_event ();
+            if (!fd_ptr->valid || !fd_ptr->accepted)
+                continue;
+            if (ev_buf [i].revents & POLLOUT)
+                fd_ptr->reactor->out_event ();
+            if (!fd_ptr->valid || !fd_ptr->accepted)
+                continue;
+            if (ev_buf [i].revents & POLLIN)
+                fd_ptr->reactor->in_event ();
+        }
+    }
+}
+
+void zmq::devpoll_t::worker_routine (void *arg_)
+{
+    ((devpoll_t*) arg_)->loop ();
+}
+
+#endif
diff --git a/src/devpoll.hpp b/src/devpoll.hpp
new file mode 100644
index 0000000..019d268
--- /dev/null
+++ b/src/devpoll.hpp
@@ -0,0 +1,110 @@
+/*
+    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_DEVPOLL_HPP_INCLUDED__
+#define __ZMQ_DEVPOLL_HPP_INCLUDED__
+
+#include "platform.hpp"
+
+#if defined ZMQ_HAVE_SOLARIS || ZMQ_HAVE_HPUX
+
+#include <vector>
+
+#include "fd.hpp"
+#include "thread.hpp"
+#include "atomic_counter.hpp"
+
+namespace zmq
+{
+
+    //  Implements socket polling mechanism using the Solaris-specific
+    //  "/dev/poll" interface.
+
+    class devpoll_t
+    {
+    public:
+
+        typedef fd_t handle_t;
+
+        devpoll_t ();
+        ~devpoll_t ();
+
+        //  "poller" concept.
+        handle_t add_fd (fd_t fd_, struct i_poll_events *events_);
+        void rm_fd (handle_t handle_);
+        void set_pollin (handle_t handle_);
+        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 ();
+
+    private:
+
+        //  Main worker thread routine.
+        static void worker_routine (void *arg_);
+
+        //  Main event loop.
+        void loop ();
+
+        //  File descriptor referring to "/dev/poll" pseudo-device.
+        fd_t devpoll_fd;
+
+        struct fd_entry_t
+        {
+            short events;
+            struct i_poll_events *reactor;
+            bool valid;
+            bool accepted;
+        };
+
+        std::vector <fd_entry_t> fd_table;
+
+        typedef std::vector <fd_t> pending_list_t;
+        pending_list_t pending_list;
+
+        //  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&);
+    };
+
+}
+
+#endif
+
+#endif
diff --git a/src/downstream.cpp b/src/downstream.cpp
new file mode 100644
index 0000000..4074a9e
--- /dev/null
+++ b/src/downstream.cpp
@@ -0,0 +1,101 @@
+/*
+    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 "downstream.hpp"
+#include "err.hpp"
+#include "pipe.hpp"
+
+zmq::downstream_t::downstream_t (class app_thread_t *parent_) :
+    socket_base_t (parent_)
+{
+    options.requires_in = false;
+    options.requires_out = true;
+}
+
+zmq::downstream_t::~downstream_t ()
+{
+}
+
+void zmq::downstream_t::xattach_pipes (class reader_t *inpipe_,
+    class writer_t *outpipe_, const blob_t &peer_identity_)
+{
+    zmq_assert (!inpipe_ && outpipe_);
+    lb.attach (outpipe_);
+}
+
+void zmq::downstream_t::xdetach_inpipe (class reader_t *pipe_)
+{
+    //  There are no inpipes, so this function shouldn't be called at all.
+    zmq_assert (false);
+}
+
+void zmq::downstream_t::xdetach_outpipe (class writer_t *pipe_)
+{
+    zmq_assert (pipe_);
+    lb.detach (pipe_);
+}
+
+void zmq::downstream_t::xkill (class reader_t *pipe_)
+{
+    //  There are no inpipes, so this function shouldn't be called at all.
+    zmq_assert (false);
+}
+
+void zmq::downstream_t::xrevive (class reader_t *pipe_)
+{
+    //  There are no inpipes, so this function shouldn't be called at all.
+    zmq_assert (false);
+}
+
+void zmq::downstream_t::xrevive (class writer_t *pipe_)
+{
+    lb.revive (pipe_);
+}
+
+int zmq::downstream_t::xsetsockopt (int option_, const void *optval_,
+    size_t optvallen_)
+{
+    //  No special option for this socket type.
+    errno = EINVAL;
+    return -1;
+}
+
+int zmq::downstream_t::xsend (zmq_msg_t *msg_, int flags_)
+{
+    return lb.send (msg_, flags_);
+}
+
+int zmq::downstream_t::xrecv (zmq_msg_t *msg_, int flags_)
+{
+    errno = ENOTSUP;
+    return -1;
+}
+
+bool zmq::downstream_t::xhas_in ()
+{
+    return false;
+}
+
+bool zmq::downstream_t::xhas_out ()
+{
+    return lb.has_out ();
+}
+
diff --git a/src/downstream.hpp b/src/downstream.hpp
new file mode 100644
index 0000000..1306743
--- /dev/null
+++ b/src/downstream.hpp
@@ -0,0 +1,61 @@
+/*
+    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_DOWNSTREAM_HPP_INCLUDED__
+#define __ZMQ_DOWNSTREAM_HPP_INCLUDED__
+
+#include "socket_base.hpp"
+#include "lb.hpp"
+
+namespace zmq
+{
+
+    class downstream_t : public socket_base_t
+    {
+    public:
+
+        downstream_t (class app_thread_t *parent_);
+        ~downstream_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:
+
+        //  Load balancer managing the outbound pipes.
+        lb_t lb;
+
+        downstream_t (const downstream_t&);
+        void operator = (const downstream_t&);
+    };
+
+}
+
+#endif
diff --git a/src/encoder.hpp b/src/encoder.hpp
new file mode 100644
index 0000000..10fe912
--- /dev/null
+++ b/src/encoder.hpp
@@ -0,0 +1,160 @@
+/*
+    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_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>
+#include <algorithm>
+
+#include "err.hpp"
+
+namespace zmq
+{
+
+    //  Helper base class for encoders. It implements the state machine that
+    //  fills the outgoing buffer. Derived classes should implement individual
+    //  state machine actions.
+
+    template <typename T> class encoder_t
+    {
+    public:
+
+        inline encoder_t (size_t bufsize_) :
+            bufsize (bufsize_)
+        {
+            buf = (unsigned char*) malloc (bufsize_);
+            zmq_assert (buf);
+        }
+
+        inline ~encoder_t ()
+        {
+            free (buf);
+        }
+
+        //  The function returns a batch of binary data. The data
+        //  are filled to a supplied buffer. If no buffer is supplied (data_
+        //  points to NULL) decoder object will provide buffer of its own.
+        //  If offset is not NULL, it is filled by offset of the first message
+        //  in the batch.If there's no beginning of a message in the batch,
+        //  offset is set to -1.
+        inline void get_data (unsigned char **data_, size_t *size_,
+            int *offset_ = NULL)
+        {
+            unsigned char *buffer = !*data_ ? buf : *data_;
+            size_t buffersize = !*data_ ? bufsize : *size_;
+
+            size_t pos = 0;
+            if (offset_)
+                *offset_ = -1;
+
+            while (true) {
+
+                //  If there are no more data to return, run the state machine.
+                //  If there are still no data, return what we already have
+                //  in the buffer.
+                if (!to_write) {
+                    if (!(static_cast <T*> (this)->*next) ()) {
+                        *data_ = buffer;
+                        *size_ = pos;
+                        return;
+                    }
+
+                    //  If beginning of the message was processed, adjust the
+                    //  first-message-offset.
+                    if (beginning) { 
+                        if (offset_ && *offset_ == -1)
+                            *offset_ = pos;
+                        beginning = false;
+                    }
+                }
+
+                //  If there are no data in the buffer yet and we are able to
+                //  fill whole buffer in a single go, let's use zero-copy.
+                //  There's no disadvantage to it as we cannot stuck multiple
+                //  messages into the buffer anyway. Note that subsequent
+                //  write(s) are non-blocking, thus each single write writes
+                //  at most SO_SNDBUF bytes at once not depending on how large
+                //  is the chunk returned from here.
+                //  As a consequence, large messages being sent won't block
+                //  other engines running in the same I/O thread for excessive
+                //  amounts of time.
+                if (!pos && !*data_ && to_write >= buffersize) {
+                    *data_ = write_pos;
+                    *size_ = to_write;
+                    write_pos = NULL;
+                    to_write = 0;
+                    return;
+                }
+
+                //  Copy data to the buffer. If the buffer is full, return.
+                size_t to_copy = std::min (to_write, buffersize - pos);
+                memcpy (buffer + pos, write_pos, to_copy);
+                pos += to_copy;
+                write_pos += to_copy;
+                to_write -= to_copy;
+                if (pos == buffersize) {
+                    *data_ = buffer;
+                    *size_ = pos;
+                    return;
+                }
+            }
+        }
+
+    protected:
+
+        //  Prototype of state machine action.
+        typedef bool (T::*step_t) ();
+
+        //  This function should be called from derived class to write the data
+        //  to the buffer and schedule next state machine action. Set beginning
+        //  to true when you are writing first byte of a message.
+        inline void next_step (void *write_pos_, size_t to_write_,
+            step_t next_, bool beginning_)
+        {
+            write_pos = (unsigned char*) write_pos_;
+            to_write = to_write_;
+            next = next_;
+            beginning = beginning_;
+        }
+
+    private:
+
+        unsigned char *write_pos;
+        size_t to_write;
+        step_t next;
+        bool beginning;
+
+        size_t bufsize;
+        unsigned char *buf;
+
+        encoder_t (const encoder_t&);
+        void operator = (const encoder_t&);
+    };
+
+}
+
+#endif
diff --git a/src/epoll.cpp b/src/epoll.cpp
new file mode 100644
index 0000000..e22eb8c
--- /dev/null
+++ b/src/epoll.cpp
@@ -0,0 +1,213 @@
+/*
+    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 "platform.hpp"
+
+#ifdef ZMQ_HAVE_LINUX
+
+#include <sys/epoll.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <algorithm>
+#include <new>
+
+#include "epoll.hpp"
+#include "err.hpp"
+#include "config.hpp"
+#include "i_poll_events.hpp"
+
+zmq::epoll_t::epoll_t () :
+    stopping (false)
+{
+    epoll_fd = epoll_create (1);
+    errno_assert (epoll_fd != -1);
+}
+
+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 ++)
+        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);
+
+    //  The memset is not actually needed. It's here to prevent debugging
+    //  tools to complain about using uninitialised memory.
+    memset (pe, 0, sizeof (poll_entry_t));
+
+    pe->fd = fd_;
+    pe->ev.events = 0;
+    pe->ev.data.ptr = pe;
+    pe->events = events_;
+
+    int rc = epoll_ctl (epoll_fd, EPOLL_CTL_ADD, fd_, &pe->ev);
+    errno_assert (rc != -1);
+
+    //  Increase the load metric of the thread.
+    load.add (1);
+
+    return pe;
+}
+
+void zmq::epoll_t::rm_fd (handle_t handle_)
+{
+    poll_entry_t *pe = (poll_entry_t*) handle_;
+    int rc = epoll_ctl (epoll_fd, EPOLL_CTL_DEL, pe->fd, &pe->ev);
+    errno_assert (rc != -1);
+    pe->fd = retired_fd;
+    retired.push_back (pe);
+
+    //  Decrease the load metric of the thread.
+    load.sub (1);
+}
+
+void zmq::epoll_t::set_pollin (handle_t handle_)
+{
+    poll_entry_t *pe = (poll_entry_t*) handle_;
+    pe->ev.events |= EPOLLIN;
+    int rc = epoll_ctl (epoll_fd, EPOLL_CTL_MOD, pe->fd, &pe->ev);
+    errno_assert (rc != -1);
+}
+
+void zmq::epoll_t::reset_pollin (handle_t handle_)
+{
+    poll_entry_t *pe = (poll_entry_t*) handle_;
+    pe->ev.events &= ~((short) EPOLLIN);
+    int rc = epoll_ctl (epoll_fd, EPOLL_CTL_MOD, pe->fd, &pe->ev);
+    errno_assert (rc != -1);
+}
+
+void zmq::epoll_t::set_pollout (handle_t handle_)
+{
+    poll_entry_t *pe = (poll_entry_t*) handle_;
+    pe->ev.events |= EPOLLOUT;
+    int rc = epoll_ctl (epoll_fd, EPOLL_CTL_MOD, pe->fd, &pe->ev);
+    errno_assert (rc != -1);
+}
+
+void zmq::epoll_t::reset_pollout (handle_t handle_)
+{
+    poll_entry_t *pe = (poll_entry_t*) handle_;
+    pe->ev.events &= ~((short) EPOLLOUT);
+    int rc = epoll_ctl (epoll_fd, EPOLL_CTL_MOD, pe->fd, &pe->ev);
+    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);
+}
+
+void zmq::epoll_t::stop ()
+{
+    stopping = true;
+}
+
+void zmq::epoll_t::loop ()
+{
+    epoll_event ev_buf [max_io_events];
+
+    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 ();
+
+            continue;
+        }
+
+        for (int i = 0; i < n; i ++) {
+            poll_entry_t *pe = ((poll_entry_t*) ev_buf [i].data.ptr);
+
+            if (pe->fd == retired_fd)
+                continue;
+            if (ev_buf [i].events & (EPOLLERR | EPOLLHUP))
+                pe->events->in_event ();
+            if (pe->fd == retired_fd)
+               continue;
+            if (ev_buf [i].events & EPOLLOUT)
+                pe->events->out_event ();
+            if (pe->fd == retired_fd)
+                continue;
+            if (ev_buf [i].events & EPOLLIN)
+                pe->events->in_event ();
+        }
+
+        //  Destroy retired event sources.
+        for (retired_t::iterator it = retired.begin (); it != retired.end ();
+              it ++)
+            delete *it;
+        retired.clear ();
+    }
+}
+
+void zmq::epoll_t::worker_routine (void *arg_)
+{
+    ((epoll_t*) arg_)->loop ();
+}
+
+#endif
diff --git a/src/epoll.hpp b/src/epoll.hpp
new file mode 100644
index 0000000..38175cb
--- /dev/null
+++ b/src/epoll.hpp
@@ -0,0 +1,106 @@
+/*
+    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_EPOLL_HPP_INCLUDED__
+#define __ZMQ_EPOLL_HPP_INCLUDED__
+
+#include "platform.hpp"
+
+#ifdef ZMQ_HAVE_LINUX
+
+#include <vector>
+#include <sys/epoll.h>
+
+#include "fd.hpp"
+#include "thread.hpp"
+#include "atomic_counter.hpp"
+
+namespace zmq
+{
+
+    //  This class implements socket polling mechanism using the Linux-specific
+    //  epoll mechanism.
+
+    class epoll_t
+    {
+    public:
+
+        typedef void* handle_t;
+
+        epoll_t ();
+        ~epoll_t ();
+
+        //  "poller" concept.
+        handle_t add_fd (fd_t fd_, struct i_poll_events *events_);
+        void rm_fd (handle_t handle_);
+        void set_pollin (handle_t handle_);
+        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 ();
+
+    private:
+
+        //  Main worker thread routine.
+        static void worker_routine (void *arg_);
+
+        //  Main event loop.
+        void loop ();
+
+        //  Main epoll file descriptor
+        fd_t epoll_fd;
+
+        struct poll_entry_t
+        {
+            fd_t fd;
+            epoll_event ev;
+            struct i_poll_events *events;
+        };
+
+        //  List of retired event sources.
+        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&);
+    };
+
+}
+
+#endif
+
+#endif
diff --git a/src/err.cpp b/src/err.cpp
new file mode 100644
index 0000000..17a9689
--- /dev/null
+++ b/src/err.cpp
@@ -0,0 +1,190 @@
+/*
+    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 "err.hpp"
+#include "platform.hpp"
+
+#ifdef ZMQ_HAVE_WINDOWS
+
+const char *zmq::wsa_error()
+{
+    int errcode = WSAGetLastError ();
+    //  TODO: This is not a generic way to handle this...
+    if (errcode == WSAEWOULDBLOCK)
+        return NULL;
+
+    //  TODO:  It seems that list of Windows socket errors is longer than this.
+    //         Investigate whether there's a way to convert it into the string
+    //         automatically (wsaError->HRESULT->string?).
+    return
+        (errcode == WSABASEERR) ?
+            "No Error" : 
+        (errcode == WSAEINTR) ?
+            "Interrupted system call" : 
+        (errcode == WSAEBADF) ?
+            "Bad file number" : 
+        (errcode == WSAEACCES) ?
+            "Permission denied" : 
+        (errcode == WSAEFAULT) ?
+            "Bad address" : 
+        (errcode == WSAEINVAL) ?
+            "Invalid argument" : 
+        (errcode == WSAEMFILE) ?
+            "Too many open files" : 
+        (errcode == WSAEWOULDBLOCK) ?
+            "Operation would block" : 
+        (errcode == WSAEINPROGRESS) ?
+            "Operation now in progress" : 
+        (errcode == WSAEALREADY) ?
+            "Operation already in progress" : 
+        (errcode == WSAENOTSOCK) ?
+            "Socket operation on non-socket" : 
+        (errcode == WSAEDESTADDRREQ) ?
+            "Destination address required" : 
+        (errcode == WSAEMSGSIZE) ?
+            "Message too long" : 
+        (errcode == WSAEPROTOTYPE) ?
+            "Protocol wrong type for socket" : 
+        (errcode == WSAENOPROTOOPT) ?
+            "Bad protocol option" : 
+        (errcode == WSAEPROTONOSUPPORT) ?
+            "Protocol not supported" : 
+        (errcode == WSAESOCKTNOSUPPORT) ?
+            "Socket type not supported" : 
+        (errcode == WSAEOPNOTSUPP) ?
+            "Operation not supported on socket" : 
+        (errcode == WSAEPFNOSUPPORT) ?
+            "Protocol family not supported" : 
+        (errcode == WSAEAFNOSUPPORT) ?
+            "Address family not supported by protocol family" : 
+        (errcode == WSAEADDRINUSE) ?
+            "Address already in use" : 
+        (errcode == WSAEADDRNOTAVAIL) ?
+            "Can't assign requested address" : 
+        (errcode == WSAENETDOWN) ?
+            "Network is down" : 
+        (errcode == WSAENETUNREACH) ?
+            "Network is unreachable" : 
+        (errcode == WSAENETRESET) ?
+            "Net dropped connection or reset" : 
+        (errcode == WSAECONNABORTED) ?
+            "Software caused connection abort" : 
+        (errcode == WSAECONNRESET) ?
+            "Connection reset by peer" : 
+        (errcode == WSAENOBUFS) ?
+            "No buffer space available" : 
+        (errcode == WSAEISCONN) ?
+            "Socket is already connected" : 
+        (errcode == WSAENOTCONN) ?
+            "Socket is not connected" : 
+        (errcode == WSAESHUTDOWN) ?
+            "Can't send after socket shutdown" : 
+        (errcode == WSAETOOMANYREFS) ?
+            "Too many references can't splice" : 
+        (errcode == WSAETIMEDOUT) ?
+            "Connection timed out" : 
+        (errcode == WSAECONNREFUSED) ?
+            "Connection refused" : 
+        (errcode == WSAELOOP) ?
+            "Too many levels of symbolic links" : 
+        (errcode == WSAENAMETOOLONG) ?
+            "File name too long" : 
+        (errcode == WSAEHOSTDOWN) ?
+            "Host is down" : 
+        (errcode == WSAEHOSTUNREACH) ?
+            "No Route to Host" : 
+        (errcode == WSAENOTEMPTY) ?
+            "Directory not empty" : 
+        (errcode == WSAEPROCLIM) ?
+            "Too many processes" : 
+        (errcode == WSAEUSERS) ?
+            "Too many users" : 
+        (errcode == WSAEDQUOT) ?
+            "Disc Quota Exceeded" : 
+        (errcode == WSAESTALE) ?
+            "Stale NFS file handle" : 
+        (errcode == WSAEREMOTE) ?
+            "Too many levels of remote in path" : 
+        (errcode == WSASYSNOTREADY) ?
+            "Network SubSystem is unavailable" : 
+        (errcode == WSAVERNOTSUPPORTED) ?
+            "WINSOCK DLL Version out of range" : 
+        (errcode == WSANOTINITIALISED) ?
+            "Successful WSASTARTUP not yet performed" : 
+        (errcode == WSAHOST_NOT_FOUND) ?
+            "Host not found" : 
+        (errcode == WSATRY_AGAIN) ?
+            "Non-Authoritative Host not found" : 
+        (errcode == WSANO_RECOVERY) ?
+            "Non-Recoverable errors: FORMERR REFUSED NOTIMP" : 
+        (errcode == WSANO_DATA) ?
+            "Valid name no data record of requested" :
+        "error not defined"; 
+}
+void zmq::win_error (char *buffer_, size_t buffer_size_)
+{
+    DWORD errcode = GetLastError ();
+    DWORD rc = FormatMessageA (FORMAT_MESSAGE_FROM_SYSTEM |
+        FORMAT_MESSAGE_IGNORE_INSERTS, NULL, errcode, MAKELANGID(LANG_NEUTRAL,
+        SUBLANG_DEFAULT), buffer_, buffer_size_, NULL );
+    zmq_assert (rc);
+}
+
+void zmq::wsa_error_to_errno ()
+{
+    int errcode = WSAGetLastError ();
+    switch (errcode) {
+    case WSAEINPROGRESS:
+        errno = EAGAIN;
+        return;
+    case WSAEBADF:
+        errno = EBADF;
+        return;
+    case WSAEINVAL:
+        errno = EINVAL;
+        return;
+    case WSAEMFILE:
+        errno = EMFILE;
+        return;
+    case WSAEFAULT:
+        errno = EFAULT;
+        return;
+    case WSAEPROTONOSUPPORT:
+        errno = EPROTONOSUPPORT;
+        return;
+    case WSAENOBUFS:
+        errno = ENOBUFS;
+        return;
+    case WSAENETDOWN:
+        errno = ENETDOWN;
+        return;
+    case WSAEADDRINUSE:
+        errno = EADDRINUSE;
+        return;
+    case WSAEADDRNOTAVAIL:
+        errno = EADDRNOTAVAIL;
+        return;
+    default:
+        wsa_assert (false);
+    }
+}
+
+#endif
diff --git a/src/err.hpp b/src/err.hpp
new file mode 100644
index 0000000..2b76569
--- /dev/null
+++ b/src/err.hpp
@@ -0,0 +1,123 @@
+/*
+    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_ERR_HPP_INCLUDED__
+#define __ZMQ_ERR_HPP_INCLUDED__
+
+#include <assert.h>
+#include <errno.h>
+#include <string.h>
+#include <stdlib.h>
+#include <stdio.h>
+
+#include "platform.hpp"
+#include "likely.hpp"
+
+#ifdef ZMQ_HAVE_WINDOWS
+#include "windows.hpp"
+#else
+#include <netdb.h>
+#endif
+
+#ifdef ZMQ_HAVE_WINDOWS
+
+namespace zmq
+{
+
+    const char *wsa_error ();
+    void win_error (char *buffer_, size_t buffer_size_);
+    void wsa_error_to_errno ();
+  
+}
+
+//  Provides convenient way to check WSA-style errors on Windows.
+#define wsa_assert(x) \
+    do {\
+        if (unlikely (!(x))) {\
+            const char *errstr = zmq::wsa_error ();\
+            if (errstr != NULL) {\
+                fprintf (stderr, "Assertion failed: %s (%s:%d)\n", errstr, \
+                    __FILE__, __LINE__);\
+                abort ();\
+            }\
+        }\
+    } while (false)
+
+// Provides convenient way to check GetLastError-style errors on Windows.
+#define win_assert(x) \
+    do {\
+        if (unlikely (!(x))) {\
+            char errstr [256];\
+            zmq::win_error (errstr, 256);\
+            fprintf (stderr, "Assertion failed: %s (%s:%d)\n", errstr, \
+                __FILE__, __LINE__);\
+            abort ();\
+        }\
+    } while (false)
+
+#endif
+
+//  This macro works in exactly the same way as the normal assert. It is used
+//  in its stead because standard assert on Win32 in broken - it prints nothing
+//  when used within the scope of JNI library.
+#define zmq_assert(x) \
+    do {\
+        if (unlikely (!(x))) {\
+            fprintf (stderr, "Assertion failed: %s (%s:%d)\n", #x, \
+                __FILE__, __LINE__);\
+            abort ();\
+        }\
+    } while (false) 
+
+//  Provides convenient way to check for errno-style errors.
+#define errno_assert(x) \
+    do {\
+        if (unlikely (!(x))) {\
+            perror (NULL);\
+            fprintf (stderr, "%s (%s:%d)\n", #x, __FILE__, __LINE__);\
+            abort ();\
+        }\
+    } while (false)
+
+// Provides convenient way to check for POSIX errors.
+#define posix_assert(x) \
+    do {\
+        if (unlikely (x)) {\
+            fprintf (stderr, "%s (%s:%d)\n", strerror (x), __FILE__, __LINE__);\
+            abort ();\
+        }\
+    } while (false)
+
+// Provides convenient way to check for errors from getaddrinfo.
+#define gai_assert(x) \
+    do {\
+        if (unlikely (x)) {\
+            const char *errstr = gai_strerror (x);\
+            fprintf (stderr, "%s (%s:%d)\n", errstr, __FILE__, __LINE__);\
+            abort ();\
+        }\
+    } while (false)
+
+#endif
+
+#define zmq_not_implemented() \
+    do {\
+        fprintf (stderr, "Hic sunt leones (%s:%d)\n", __FILE__, __LINE__);\
+        abort ();\
+    } while (false)
diff --git a/src/fd.hpp b/src/fd.hpp
new file mode 100644
index 0000000..6ad8252
--- /dev/null
+++ b/src/fd.hpp
@@ -0,0 +1,44 @@
+/*
+    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_FD_HPP_INCLUDED__
+#define __ZMQ_FD_HPP_INCLUDED__
+
+#include "platform.hpp"
+
+#ifdef ZMQ_HAVE_WINDOWS
+#include "windows.hpp"
+#endif
+
+namespace zmq
+{
+#ifdef ZMQ_HAVE_WINDOWS
+#if defined _MSC_VER &&_MSC_VER <= 1400
+    typedef UINT_PTR fd_t;
+    enum {retired_fd = (fd_t)(~0)};
+#else
+    typedef SOCKET fd_t;
+    enum {retired_fd = INVALID_SOCKET};
+#endif
+#else
+    typedef int fd_t;
+    enum {retired_fd = -1};
+#endif
+}
+#endif
diff --git a/src/forwarder.cpp b/src/forwarder.cpp
new file mode 100644
index 0000000..5aab8f2
--- /dev/null
+++ b/src/forwarder.cpp
@@ -0,0 +1,38 @@
+/*
+    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 "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);
+
+    while (true) {
+        insocket_->recv (&msg, 0);
+        outsocket_->send (&msg, 0);
+    }
+
+    return 0;
+}
diff --git a/src/forwarder.hpp b/src/forwarder.hpp
new file mode 100644
index 0000000..68827a4
--- /dev/null
+++ b/src/forwarder.hpp
@@ -0,0 +1,31 @@
+/*
+    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
new file mode 100644
index 0000000..9028853
--- /dev/null
+++ b/src/fq.cpp
@@ -0,0 +1,130 @@
+/*
+    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 "fq.hpp"
+#include "pipe.hpp"
+#include "err.hpp"
+
+zmq::fq_t::fq_t () :
+    active (0),
+    current (0),
+    more (false)
+{
+}
+
+zmq::fq_t::~fq_t ()
+{
+    for (pipes_t::size_type i = 0; i != pipes.size (); i++)
+        pipes [i]->term ();
+}
+
+void zmq::fq_t::attach (reader_t *pipe_)
+{
+    pipes.push_back (pipe_);
+    pipes.swap (active, pipes.size () - 1);
+    active++;
+}
+
+void zmq::fq_t::detach (reader_t *pipe_)
+{
+    zmq_assert (!more || pipes [current] != pipe_);
+
+    //  Remove the pipe from the list; adjust number of active pipes
+    //  accordingly.
+    if (pipes.index (pipe_) < active) {
+        active--;
+        if (current == active)
+            current = 0;
+    }
+    pipes.erase (pipe_);
+}
+
+void zmq::fq_t::kill (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_)
+{
+    //  Move the pipe to the list of active pipes.
+    pipes.swap (pipes.index (pipe_), active);
+    active++;
+}
+
+int zmq::fq_t::recv (zmq_msg_t *msg_, int flags_)
+{
+    //  Deallocate old content of the message.
+    zmq_msg_close (msg_);
+
+    //  Round-robin over the pipes to get the next message.
+    for (int count = active; count != 0; count--) {
+
+        //  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_);
+        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
+        //  the 'current' pointer.
+        if (fetched) {
+            more = msg_->flags & ZMQ_MSG_MORE;
+            if (!more) {
+                current++;
+                if (current >= active)
+                    current = 0;
+            }
+            return 0;
+        }
+    }
+
+    //  No message is available. Initialise the output parameter
+    //  to be a 0-byte message.
+    zmq_msg_init (msg_);
+    errno = EAGAIN;
+    return -1;
+}
+
+bool zmq::fq_t::has_in ()
+{
+    //  There are subsequent parts of the partly-read message available.
+    if (more)
+        return true;
+
+    //  Note that messing with current doesn't break the fairness of fair
+    //  queueing algorithm. If there are no messages available current will
+    //  get back to its original value. Otherwise it'll point to the first
+    //  pipe holding messages, skipping only pipes with no messages available.
+    for (int count = active; count != 0; count--) {
+        if (pipes [current]->check_read ())
+            return true;
+        current++;
+        if (current >= active)
+            current = 0;
+    }
+
+    return false;
+}
+
diff --git a/src/fq.hpp b/src/fq.hpp
new file mode 100644
index 0000000..5c699ee
--- /dev/null
+++ b/src/fq.hpp
@@ -0,0 +1,68 @@
+/*
+    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_FQ_HPP_INCLUDED__
+#define __ZMQ_FQ_HPP_INCLUDED__
+
+#include "yarray.hpp"
+
+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
+    {
+    public:
+
+        fq_t ();
+        ~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_);
+        int recv (zmq_msg_t *msg_, int flags_);
+        bool has_in ();
+
+    private:
+
+        //  Inbound pipes.
+        typedef yarray_t <class reader_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;
+
+        //  Index of the next bound pipe to read a message from.
+        pipes_t::size_type current;
+
+        //  If true, part of a multipart message was already received, but
+        //  there are following parts still waiting in the current pipe.
+        bool more;
+
+        fq_t (const fq_t&);
+        void operator = (const fq_t&);
+    };
+
+}
+
+#endif
diff --git a/src/i_endpoint.hpp b/src/i_endpoint.hpp
new file mode 100644
index 0000000..0d14224
--- /dev/null
+++ b/src/i_endpoint.hpp
@@ -0,0 +1,43 @@
+/*
+    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
new file mode 100644
index 0000000..ea6b850
--- /dev/null
+++ b/src/i_engine.hpp
@@ -0,0 +1,49 @@
+/*
+    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_ENGINE_HPP_INCLUDED__
+#define __ZMQ_I_ENGINE_HPP_INCLUDED__
+
+#include <stddef.h>
+
+namespace zmq
+{
+
+    struct i_engine
+    {
+        virtual ~i_engine () {}
+
+        //  Plug the engine to the session.
+        virtual void plug (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;
+
+        //  This method is called by the session to signalise that more
+        //  messages can be written to the pipe.
+        virtual void resume_input () = 0;
+    };
+
+}
+
+#endif
diff --git a/src/i_inout.hpp b/src/i_inout.hpp
new file mode 100644
index 0000000..21d1838
--- /dev/null
+++ b/src/i_inout.hpp
@@ -0,0 +1,60 @@
+/*
+    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_INOUT_HPP_INCLUDED__
+#define __ZMQ_I_INOUT_HPP_INCLUDED__
+
+#include "../include/zmq.h"
+
+#include "stdint.hpp"
+
+namespace zmq
+{
+
+    struct i_inout
+    {
+        virtual ~i_inout () {}
+
+        //  Engine asks to get a message to send to the network.
+        virtual bool read (::zmq_msg_t *msg_) = 0;
+
+        //  Engine sends the incoming message further on downstream.
+        virtual bool write (::zmq_msg_t *msg_) = 0;
+
+        //  Flush all the previously written messages downstream.
+        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;
+    };
+
+}
+
+#endif
diff --git a/src/i_poll_events.hpp b/src/i_poll_events.hpp
new file mode 100644
index 0000000..8b85f7a
--- /dev/null
+++ b/src/i_poll_events.hpp
@@ -0,0 +1,45 @@
+/*
+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_POLL_EVENTS_HPP_INCLUDED__
+#define __ZMQ_I_POLL_EVENTS_HPP_INCLUDED__
+ 
+namespace zmq
+{
+ 
+    // Virtual interface to be exposed by object that want to be notified
+    // about events on file descriptors.
+ 
+    struct i_poll_events
+    {
+        virtual ~i_poll_events () {};
+ 
+        // Called by I/O thread when file descriptor is ready for reading.
+        virtual void in_event () = 0;
+ 
+        // Called by I/O thread when file descriptor is ready for writing.
+        virtual void out_event () = 0;
+ 
+        // Called when timer expires.
+        virtual void timer_event () = 0;
+    };
+ 
+}
+ 
+#endif
diff --git a/src/io_object.cpp b/src/io_object.cpp
new file mode 100644
index 0000000..086f173
--- /dev/null
+++ b/src/io_object.cpp
@@ -0,0 +1,92 @@
+/*
+    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 "io_object.hpp"
+#include "io_thread.hpp"
+#include "err.hpp"
+
+zmq::io_object_t::io_object_t (io_thread_t *io_thread_)
+{
+    //  Retrieve the poller from the thread we are running in.
+    poller = io_thread_->get_poller ();
+}
+
+zmq::io_object_t::~io_object_t ()
+{
+}
+
+void zmq::io_object_t::set_io_thread (io_thread_t *io_thread_)
+{
+    poller = io_thread_->get_poller ();
+}
+
+zmq::io_object_t::handle_t zmq::io_object_t::add_fd (fd_t fd_)
+{
+    return poller->add_fd (fd_, this);
+}
+
+void zmq::io_object_t::rm_fd (handle_t handle_)
+{
+    poller->rm_fd (handle_);
+}
+
+void zmq::io_object_t::set_pollin (handle_t handle_)
+{
+    poller->set_pollin (handle_);
+}
+
+void zmq::io_object_t::reset_pollin (handle_t handle_)
+{
+    poller->reset_pollin (handle_);
+}
+
+void zmq::io_object_t::set_pollout (handle_t handle_)
+{
+    poller->set_pollout (handle_);
+}
+
+void zmq::io_object_t::reset_pollout (handle_t handle_)
+{
+    poller->reset_pollout (handle_);
+}
+
+void zmq::io_object_t::add_timer ()
+{
+    poller->add_timer (this);
+}
+
+void zmq::io_object_t::cancel_timer ()
+{
+    poller->cancel_timer (this);
+}
+
+void zmq::io_object_t::in_event ()
+{
+    zmq_assert (false);
+}
+
+void zmq::io_object_t::out_event ()
+{
+    zmq_assert (false);
+}
+
+void zmq::io_object_t::timer_event ()
+{
+    zmq_assert (false);
+}
diff --git a/src/io_object.hpp b/src/io_object.hpp
new file mode 100644
index 0000000..655e7f5
--- /dev/null
+++ b/src/io_object.hpp
@@ -0,0 +1,77 @@
+/*
+    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_IO_OBJECT_HPP_INCLUDED__
+#define __ZMQ_IO_OBJECT_HPP_INCLUDED__
+
+#include <stddef.h>
+
+#include "stdint.hpp"
+#include "poller.hpp"
+#include "i_poll_events.hpp"
+
+namespace zmq
+{
+
+    //  Simple base class for objects that live in I/O threads.
+    //  It makes communication with the poller object easier and
+    //  makes defining unneeded event handlers unnecessary.
+
+    class io_object_t : public i_poll_events
+    {
+    public:
+
+        io_object_t (class io_thread_t *io_thread_ = NULL);
+        ~io_object_t ();
+
+    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_);
+        void set_pollin (handle_t handle_);
+        void reset_pollin (handle_t handle_);
+        void set_pollout (handle_t handle_);
+        void reset_pollout (handle_t handle_);
+        void add_timer ();
+        void cancel_timer ();
+
+        //  i_poll_events interface implementation.
+        void in_event ();
+        void out_event ();
+        void timer_event ();
+
+    private:
+
+        poller_t *poller;
+
+        io_object_t (const io_object_t&);
+        void operator = (const io_object_t&);
+    };
+
+}
+
+#endif
diff --git a/src/io_thread.cpp b/src/io_thread.cpp
new file mode 100644
index 0000000..fac6961
--- /dev/null
+++ b/src/io_thread.cpp
@@ -0,0 +1,105 @@
+/*
+    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 "../include/zmq.h"
+
+#include "io_thread.hpp"
+#include "platform.hpp"
+#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_)
+{
+    poller = new (std::nothrow) poller_t;
+    zmq_assert (poller);
+
+    signaler_handle = poller->add_fd (signaler.get_fd (), this);
+    poller->set_pollin (signaler_handle);
+}
+
+zmq::io_thread_t::~io_thread_t ()
+{
+    delete poller;
+}
+
+void zmq::io_thread_t::start ()
+{
+    //  Start the underlying I/O thread.
+    poller->start ();
+}
+
+void zmq::io_thread_t::stop ()
+{
+    send_stop ();
+}
+
+zmq::signaler_t *zmq::io_thread_t::get_signaler ()
+{
+    return &signaler;
+}
+
+int zmq::io_thread_t::get_load ()
+{
+    return poller->get_load ();
+}
+
+void zmq::io_thread_t::in_event ()
+{
+    //  TODO: Do we want to limit number of commands I/O thread can
+    //  process in a single go?
+
+    while (true) {
+
+        //  Get the next command. If there is none, exit.
+        command_t cmd;
+        if (!signaler.recv (&cmd, false))
+            break;
+
+        //  Process the command.
+        cmd.destination->process_command (cmd);
+    }
+}
+
+void zmq::io_thread_t::out_event ()
+{
+    //  We are never polling for POLLOUT here. This function is never called.
+    zmq_assert (false);
+}
+
+void zmq::io_thread_t::timer_event ()
+{
+    //  No timers here. This function is never called.
+    zmq_assert (false);
+}
+
+zmq::poller_t *zmq::io_thread_t::get_poller ()
+{
+    zmq_assert (poller);
+    return poller;
+}
+
+void zmq::io_thread_t::process_stop ()
+{
+    poller->rm_fd (signaler_handle);
+    poller->stop ();
+}
diff --git a/src/io_thread.hpp b/src/io_thread.hpp
new file mode 100644
index 0000000..3d832c0
--- /dev/null
+++ b/src/io_thread.hpp
@@ -0,0 +1,85 @@
+/*
+    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_IO_THREAD_HPP_INCLUDED__
+#define __ZMQ_IO_THREAD_HPP_INCLUDED__
+
+#include <vector>
+
+#include "stdint.hpp"
+#include "object.hpp"
+#include "poller.hpp"
+#include "i_poll_events.hpp"
+#include "signaler.hpp"
+
+namespace zmq
+{
+
+    //  Generic part of the I/O thread. Polling-mechanism-specific features
+    //  are implemented in separate "polling objects".
+
+    class io_thread_t : public object_t, public i_poll_events
+    {
+    public:
+
+        io_thread_t (class ctx_t *ctx_, uint32_t thread_slot_);
+
+        //  Clean-up. If the thread was started, it's neccessary to call 'stop'
+        //  before invoking destructor. Otherwise the destructor would hang up.
+        ~io_thread_t ();
+
+        //  Launch the physical thread.
+        void start ();
+
+        //  Ask underlying thread to stop.
+        void stop ();
+
+        //  Returns signaler associated with this I/O thread.
+        signaler_t *get_signaler ();
+
+        //  i_poll_events implementation.
+        void in_event ();
+        void out_event ();
+        void timer_event ();
+
+        //  Used by io_objects to retrieve the assciated poller object.
+        poller_t *get_poller ();
+
+        //  Command handlers.
+        void process_stop ();
+
+        //  Returns load experienced by the I/O thread.
+        int get_load ();
+
+    private:
+
+        //  Poll thread gets notifications about incoming commands using
+        //  this signaler.
+        signaler_t signaler;
+
+        //  Handle associated with signaler's file descriptor.
+        poller_t::handle_t signaler_handle;
+
+        //  I/O multiplexing is performed using a poller object.
+        poller_t *poller;
+    };
+
+}
+
+#endif
diff --git a/src/ip.cpp b/src/ip.cpp
new file mode 100644
index 0000000..79d90da
--- /dev/null
+++ b/src/ip.cpp
@@ -0,0 +1,335 @@
+/*
+    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 <stdlib.h>
+#include <string.h>
+#include <stdlib.h>
+#include <string>
+
+#include "ip.hpp"
+#include "platform.hpp"
+#include "err.hpp"
+#include "stdint.hpp"
+
+#if defined ZMQ_HAVE_SOLARIS
+
+#include <sys/sockio.h>
+#include <net/if.h>
+#include <unistd.h>
+
+//  On Solaris platform, network interface name can be queried by ioctl.
+static int resolve_nic_name (in_addr* addr_, char const *interface_)
+{
+    //  Create a socket.
+    int fd = socket (AF_INET, SOCK_DGRAM, 0);
+    zmq_assert (fd != -1);
+
+    //  Retrieve number of interfaces.
+    lifnum ifn;
+    ifn.lifn_family = AF_UNSPEC;
+    ifn.lifn_flags = 0;
+    int rc = ioctl (fd, SIOCGLIFNUM, (char*) &ifn);
+    zmq_assert (rc != -1);
+
+    //  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);
+    
+    //  Retrieve interface names.
+    lifconf ifc;
+    ifc.lifc_family = AF_UNSPEC;
+    ifc.lifc_flags = 0;
+    ifc.lifc_len = ifr_size;
+    ifc.lifc_buf = ifr;
+    rc = ioctl (fd, SIOCGLIFCONF, (char*) &ifc);
+    zmq_assert (rc != -1);
+
+    //  Find the interface with the specified name and AF_INET family.
+    bool found = false;
+    lifreq *ifrp = ifc.lifc_req;
+    for (int n = 0; n < (int) (ifc.lifc_len / sizeof (lifreq));
+          n ++, ifrp ++) {
+        if (!strcmp (interface_, ifrp->lifr_name)) {
+            rc = ioctl (fd, SIOCGLIFADDR, (char*) ifrp);
+            zmq_assert (rc != -1);
+            if (ifrp->lifr_addr.ss_family == AF_INET) {
+                *addr_ = ((sockaddr_in*) &ifrp->lifr_addr)->sin_addr;
+                found = true;
+                break;
+            }
+        }
+    }
+
+    //  Clean-up.
+    free (ifr);
+    close (fd);
+
+    if (!found) {
+        errno = ENODEV;
+        return -1;
+    }
+
+    return 0;
+}
+
+#elif defined ZMQ_HAVE_AIX || ZMQ_HAVE_HPUX
+
+#include <sys/types.h>
+#include <unistd.h>
+#include <sys/ioctl.h>
+#include <net/if.h>
+
+static int resolve_nic_name (in_addr* addr_, char const *interface_)
+{
+    //  Create a socket.
+    int sd = socket (AF_INET, SOCK_DGRAM, 0);
+    zmq_assert (sd != -1);
+
+    struct ifreq ifr; 
+
+    //  Copy interface name for ioctl get.
+    strncpy (ifr.ifr_name, interface_, sizeof (ifr.ifr_name));
+
+    //  Fetch interface address.
+    int rc = ioctl (sd, SIOCGIFADDR, (caddr_t) &ifr, sizeof (struct ifreq));
+
+    //  Clean up.
+    close (sd);
+
+    if (rc == -1) {
+        errno = ENODEV;
+        return -1;
+    }
+
+    struct sockaddr *sa = (struct sockaddr *) &ifr.ifr_addr;
+    *addr_ = ((sockaddr_in*)sa)->sin_addr;
+    return 0;    
+}
+
+#elif ((defined ZMQ_HAVE_LINUX || defined ZMQ_HAVE_FREEBSD ||\
+    defined ZMQ_HAVE_OSX || defined ZMQ_HAVE_OPENBSD ||\
+    defined ZMQ_HAVE_QNXNTO || defined ZMQ_HAVE_NETBSD)\
+    && defined ZMQ_HAVE_IFADDRS)
+
+#include <ifaddrs.h>
+
+//  On these platforms, network interface name can be queried
+//  using getifaddrs function.
+static int resolve_nic_name (in_addr* addr_, char const *interface_)
+{
+    //  Get the addresses.
+    ifaddrs* ifa = NULL;
+    int rc = getifaddrs (&ifa);
+    zmq_assert (rc == 0);    
+    zmq_assert (ifa != NULL);
+
+    //  Find the corresponding network interface.
+    bool found = false;
+    for (ifaddrs *ifp = ifa; ifp != NULL ;ifp = ifp->ifa_next)
+        if (ifp->ifa_addr && ifp->ifa_addr->sa_family == AF_INET 
+            && !strcmp (interface_, ifp->ifa_name)) 
+        {
+            *addr_ = ((sockaddr_in*) ifp->ifa_addr)->sin_addr;
+            found = true;
+            break;
+        }
+
+    //  Clean-up;
+    freeifaddrs (ifa);
+
+    if (!found) {
+        errno = ENODEV;
+        return -1;
+    }
+
+    return 0;
+}
+
+#else
+
+//  On other platforms we assume there are no sane interface names.
+//  This is true especially of Windows.
+static int resolve_nic_name (in_addr* addr_, char const *interface_)
+{
+    errno = ENODEV;
+    return -1;
+}
+
+#endif
+
+int zmq::resolve_ip_interface (sockaddr_storage* addr_, socklen_t *addr_len_,
+    char const *interface_)
+{
+    //  Find the ':' at end that separates NIC name from service.
+    const char *delimiter = strrchr (interface_, ':');
+    if (!delimiter) {
+        errno = EINVAL;
+        return -1;
+    }
+
+    //  Separate the name/port.
+    std::string iface (interface_, delimiter - interface_);
+    std::string service (delimiter + 1);
+
+    //  Initialize the output parameter.
+    memset (addr_, 0, sizeof (*addr_));
+
+    //  Initialise IPv4-format family/port.
+    sockaddr_in ip4_addr;
+    memset (&ip4_addr, 0, sizeof (ip4_addr));
+    ip4_addr.sin_family = AF_INET;
+    ip4_addr.sin_port = htons ((uint16_t) atoi (service.c_str()));
+
+    //  Initialize temporary output pointers with ip4_addr
+    sockaddr *out_addr = (sockaddr *) &ip4_addr;
+    size_t out_addrlen = sizeof (ip4_addr);
+
+    //  0 is not a valid port.
+    if (!ip4_addr.sin_port) {
+        errno = EINVAL;
+        return -1;
+    }
+
+    //  * resolves to INADDR_ANY.
+    if (iface.compare("*") == 0) {
+        ip4_addr.sin_addr.s_addr = htonl (INADDR_ANY);
+        zmq_assert (out_addrlen <= sizeof (*addr_));
+        memcpy (addr_, out_addr, out_addrlen);
+        *addr_len_ = out_addrlen;
+        return 0;
+    }
+
+    //  Try to resolve the string as a NIC name.
+    int rc = resolve_nic_name (&ip4_addr.sin_addr, iface.c_str());
+    if (rc != 0 && errno != ENODEV)
+        return rc;
+    if (rc == 0) {
+        zmq_assert (out_addrlen <= sizeof (*addr_));
+        memcpy (addr_, out_addr, out_addrlen);
+        *addr_len_ = out_addrlen;
+        return 0;
+    }
+
+    //  There's no such interface name. Assume literal address.
+    addrinfo *res = NULL;
+
+    //  Set up the query.
+    addrinfo req;
+    memset (&req, 0, sizeof (req));
+
+    //  We only support IPv4 addresses for now.
+    req.ai_family = AF_INET;
+
+    //  Arbitrary, not used in the output, but avoids duplicate results.
+    req.ai_socktype = SOCK_STREAM;
+
+    //  Restrict hostname/service to literals to avoid any DNS lookups or
+    //  service-name irregularity due to indeterminate socktype.
+    req.ai_flags = AI_PASSIVE | AI_NUMERICHOST | AI_NUMERICSERV;
+
+    //  Resolve the literal address. Some of the error info is lost in case
+    //  of error, however, there's no way to report EAI errors via errno.
+    rc = getaddrinfo (iface.c_str(), service.c_str(), &req, &res);
+    if (rc) {
+        errno = ENODEV;
+        return -1;
+    }
+
+    //  Use the first result.
+    zmq_assert ((size_t) (res->ai_addrlen) <= sizeof (*addr_));
+    memcpy (addr_, res->ai_addr, res->ai_addrlen);
+    *addr_len_ = res->ai_addrlen;
+
+    //  Cleanup getaddrinfo after copying the possibly referenced result.
+    if (res)
+        freeaddrinfo (res);
+
+    return 0;
+}
+
+int zmq::resolve_ip_hostname (sockaddr_storage *addr_, socklen_t *addr_len_,
+    const char *hostname_)
+{
+    //  Find the ':' that separates hostname name from service.
+    const char *delimiter = strchr (hostname_, ':');
+    if (!delimiter) {
+        errno = EINVAL;
+        return -1;
+    }
+
+    //  Separate the hostname and service.
+    std::string hostname (hostname_, delimiter - hostname_);
+    std::string service (delimiter + 1);
+
+    //  Set up the query.
+    addrinfo req;
+    memset (&req, 0, sizeof (req));
+
+    //  We only support IPv4 addresses for now.
+    req.ai_family = AF_INET;
+
+    //  Need to choose one to avoid duplicate results from getaddrinfo() - this
+    //  doesn't really matter, since it's not included in the addr-output.
+    req.ai_socktype = SOCK_STREAM;
+    
+    //  Avoid named services due to unclear socktype, and don't pick IPv4
+    //  addresses if we don't have a local IPv4 address configured.
+    //  If this is failing for you on a host with only IPv6 connectivity,
+    //  please contribute proper IPv6 support for all functions in this file.
+    req.ai_flags = AI_NUMERICSERV | AI_ADDRCONFIG;
+
+    //  Resolve host name. Some of the error info is lost in case of error,
+    //  however, there's no way to report EAI errors via errno.
+    addrinfo *res;
+    int rc = getaddrinfo (hostname.c_str (), service.c_str (), &req, &res);
+    if (rc) {
+        errno = EINVAL;
+        return -1;
+    }
+
+    //  Copy first result to output addr with hostname and service.
+    zmq_assert ((size_t) (res->ai_addrlen) <= sizeof (*addr_));
+    memcpy (addr_, res->ai_addr, res->ai_addrlen);
+    *addr_len_ = res->ai_addrlen;
+ 
+    freeaddrinfo (res);
+    
+    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_)
+{
+    sockaddr_un *un = (sockaddr_un*) addr_;
+    if (strlen (path_) >= sizeof (un->sun_path))
+    {
+        errno = ENAMETOOLONG;
+        return -1;
+    }
+    strcpy (un->sun_path, path_);
+    un->sun_family = AF_UNIX;
+    *addr_len_ = sizeof (sockaddr_un);
+    return 0;
+}
+
+#endif
+
diff --git a/src/ip.hpp b/src/ip.hpp
new file mode 100644
index 0000000..d963df2
--- /dev/null
+++ b/src/ip.hpp
@@ -0,0 +1,69 @@
+/*
+    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_IP_HPP_INCLUDED__
+#define __ZMQ_IP_HPP_INCLUDED__
+
+#include "platform.hpp"
+
+#ifdef ZMQ_HAVE_WINDOWS
+#include "windows.hpp"
+#else
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <arpa/inet.h>
+#include <netinet/in.h>
+#include <netdb.h>
+#endif
+
+#if !defined ZMQ_HAVE_WINDOWS && !defined ZMQ_HAVE_OPENVMS
+#include <sys/un.h>
+#endif
+
+//  Some platforms (notably Darwin/OSX and NetBSD) do not define all AI_
+//  flags for getaddrinfo(). This can be worked around safely by defining
+//  these to 0.
+#ifndef AI_ADDRCONFIG
+#define AI_ADDRCONFIG 0
+#endif
+#ifndef AI_NUMERICSERV
+#define AI_NUMERICSERV 0
+#endif
+
+namespace zmq
+{
+
+    //  Resolves network interface name in <nic-name>:<port> format. Symbol "*"
+    //  (asterisk) resolves to INADDR_ANY (all network interfaces).
+    int resolve_ip_interface (sockaddr_storage *addr_, socklen_t *addr_len_,
+        char const *interface_);
+
+    //  This function resolves a string in <hostname>:<port-number> format.
+    //  Hostname can be either the name of the host or its IP address.
+    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
new file mode 100644
index 0000000..e1fe2fa
--- /dev/null
+++ b/src/kqueue.cpp
@@ -0,0 +1,226 @@
+/*
+    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 "platform.hpp"
+
+#if defined ZMQ_HAVE_FREEBSD || defined ZMQ_HAVE_OPENBSD ||\
+    defined ZMQ_HAVE_OSX || defined ZMQ_HAVE_NETBSD
+
+#include <sys/time.h>
+#include <sys/types.h>
+#include <sys/event.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <algorithm>
+#include <new>
+
+#include "kqueue.hpp"
+#include "err.hpp"
+#include "config.hpp"
+#include "i_poll_events.hpp"
+
+//  NetBSD defines (struct kevent).udata as intptr_t, everyone else
+//  as void *.
+#if defined ZMQ_HAVE_NETBSD
+#define kevent_udata_t intptr_t
+#else
+#define kevent_udata_t void *
+#endif
+
+zmq::kqueue_t::kqueue_t () :
+    stopping (false)
+{
+    //  Create event queue
+    kqueue_fd = kqueue ();
+    errno_assert (kqueue_fd != -1);
+}
+
+zmq::kqueue_t::~kqueue_t ()
+{
+    worker.stop ();
+
+    //  Make sure there are no fds registered on shutdown.
+    zmq_assert (load.get () == 0);
+
+    close (kqueue_fd);
+}
+
+void zmq::kqueue_t::kevent_add (fd_t fd_, short filter_, void *udata_)
+{
+    struct kevent ev;
+
+    EV_SET (&ev, fd_, filter_, EV_ADD, 0, 0, (kevent_udata_t)udata_);
+    int rc = kevent (kqueue_fd, &ev, 1, NULL, 0, NULL);
+    errno_assert (rc != -1);
+}
+
+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);
+    int rc = kevent (kqueue_fd, &ev, 1, NULL, 0, NULL);
+    errno_assert (rc != -1);
+}
+
+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);
+
+    pe->fd = fd_;
+    pe->flag_pollin = 0;
+    pe->flag_pollout = 0;
+    pe->reactor = reactor_;
+
+    return pe;
+}
+
+void zmq::kqueue_t::rm_fd (handle_t handle_)
+{
+    poll_entry_t *pe = (poll_entry_t*) handle_;
+    if (pe->flag_pollin)
+        kevent_delete (pe->fd, EVFILT_READ);
+    if (pe->flag_pollout)
+        kevent_delete (pe->fd, EVFILT_WRITE);
+    pe->fd = retired_fd;
+    retired.push_back (pe);
+}
+
+void zmq::kqueue_t::set_pollin (handle_t handle_)
+{
+    poll_entry_t *pe = (poll_entry_t*) handle_;
+    pe->flag_pollin = true;
+    kevent_add (pe->fd, EVFILT_READ, pe);
+}
+
+void zmq::kqueue_t::reset_pollin (handle_t handle_)
+{
+    poll_entry_t *pe = (poll_entry_t*) handle_;
+    pe->flag_pollin = false;
+    kevent_delete (pe->fd, EVFILT_READ);
+}
+
+void zmq::kqueue_t::set_pollout (handle_t handle_)
+{
+    poll_entry_t *pe = (poll_entry_t*) handle_;
+    pe->flag_pollout = true;
+    kevent_add (pe->fd, EVFILT_WRITE, pe);
+}
+
+void zmq::kqueue_t::reset_pollout (handle_t handle_)
+{
+    poll_entry_t *pe = (poll_entry_t*) handle_;
+    pe->flag_pollout = false;
+    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);
+}
+
+void zmq::kqueue_t::stop ()
+{
+    stopping = true;
+}
+
+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};
+
+        //  Wait for events.
+        int n = kevent (kqueue_fd, NULL, 0,
+             &ev_buf [0], max_io_events, timers.empty () ? NULL : &timeout);
+        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;
+
+            if (pe->fd == retired_fd)
+                continue;
+            if (ev_buf [i].flags & EV_EOF)
+                pe->reactor->in_event ();
+            if (pe->fd == retired_fd)
+                continue;
+            if (ev_buf [i].filter == EVFILT_WRITE)
+                pe->reactor->out_event ();
+            if (pe->fd == retired_fd)
+                continue;
+            if (ev_buf [i].filter == EVFILT_READ)
+                pe->reactor->in_event ();
+        }
+
+        //  Destroy retired event sources.
+        for (retired_t::iterator it = retired.begin (); it != retired.end ();
+              it ++)
+            delete *it;
+        retired.clear ();
+    }
+}
+
+void zmq::kqueue_t::worker_routine (void *arg_)
+{
+    ((kqueue_t*) arg_)->loop ();
+}
+
+//  Don't pollute namespace with defines local to this file
+#undef kevent_udata_t
+#endif
diff --git a/src/kqueue.hpp b/src/kqueue.hpp
new file mode 100644
index 0000000..ac28a7d
--- /dev/null
+++ b/src/kqueue.hpp
@@ -0,0 +1,113 @@
+/*
+    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_KQUEUE_HPP_INCLUDED__
+#define __ZMQ_KQUEUE_HPP_INCLUDED__
+
+#include "platform.hpp"
+
+#if defined ZMQ_HAVE_FREEBSD || defined ZMQ_HAVE_OPENBSD ||\
+    defined ZMQ_HAVE_OSX || defined ZMQ_HAVE_NETBSD
+
+#include <vector>
+
+#include "fd.hpp"
+#include "thread.hpp"
+#include "atomic_counter.hpp"
+
+namespace zmq
+{
+
+    //  Implements socket polling mechanism using the BSD-specific
+    //  kqueue interface.
+
+    class kqueue_t
+    {
+    public:
+
+        typedef void* handle_t;
+
+        kqueue_t ();
+        ~kqueue_t ();
+
+        //  "poller" concept.
+        handle_t add_fd (fd_t fd_, struct i_poll_events *events_);
+        void rm_fd (handle_t handle_);
+        void set_pollin (handle_t handle_);
+        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 ();
+
+    private:
+
+        //  Main worker thread routine.
+        static void worker_routine (void *arg_);
+
+        //  Main event loop.
+        void loop ();
+
+        //  File descriptor referring to the kernel event queue.
+        fd_t kqueue_fd;
+
+        //  Adds the event to the kqueue.
+        void kevent_add (fd_t fd_, short filter_, void *udata_);
+
+        //  Deletes the event from the kqueue.
+        void kevent_delete (fd_t fd_, short filter_);
+
+        struct poll_entry_t
+        {
+            fd_t fd;
+            bool flag_pollin;
+            bool flag_pollout;
+            i_poll_events *reactor;
+        };
+
+        //  List of retired event sources.
+        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&);
+    };
+
+}
+
+#endif
+
+#endif
diff --git a/src/lb.cpp b/src/lb.cpp
new file mode 100644
index 0000000..ca93ba2
--- /dev/null
+++ b/src/lb.cpp
@@ -0,0 +1,123 @@
+/*
+    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 "lb.hpp"
+#include "pipe.hpp"
+#include "err.hpp"
+
+zmq::lb_t::lb_t () :
+    active (0),
+    current (0),
+    more (false)
+{
+}
+
+zmq::lb_t::~lb_t ()
+{
+    for (pipes_t::size_type i = 0; i != pipes.size (); i++)
+        pipes [i]->term ();
+}
+
+void zmq::lb_t::attach (writer_t *pipe_)
+{
+    pipes.push_back (pipe_);
+    pipes.swap (active, pipes.size () - 1);
+    active++;
+}
+
+void zmq::lb_t::detach (writer_t *pipe_)
+{
+    zmq_assert (!more || pipes [current] != pipe_);
+
+    //  Remove the pipe from the list; adjust number of active pipes
+    //  accordingly.
+    if (pipes.index (pipe_) < active) {
+        active--;
+        if (current == active)
+            current = 0;
+    }
+    pipes.erase (pipe_);
+}
+
+void zmq::lb_t::revive (writer_t *pipe_)
+{
+    //  Move the pipe to the list of active pipes.
+    pipes.swap (pipes.index (pipe_), active);
+    active++;
+}
+
+int zmq::lb_t::send (zmq_msg_t *msg_, int flags_)
+{
+    while (active > 0) {
+        if (pipes [current]->write (msg_)) {
+            more = msg_->flags & ZMQ_MSG_MORE;
+            break;
+        }
+
+        zmq_assert (!more);
+        active--;
+        if (current < active)
+            pipes.swap (current, active);
+        else
+            current = 0;
+    }
+
+    //  If there are no pipes we cannot send the message.
+    if (active == 0) {
+        errno = EAGAIN;
+        return -1;
+    }
+
+    //  If it's final part of the message we can fluch it downstream and
+    //  continue round-robinning (load balance).
+    if (!more) {
+        pipes [current]->flush ();
+        current = (current + 1) % active;
+    }
+
+    //  Detach the message from the data buffer.
+    int rc = zmq_msg_init (msg_);
+    zmq_assert (rc == 0);
+
+    return 0;
+}
+
+bool zmq::lb_t::has_out ()
+{
+    //  If one part of the message was already written we can definitely
+    //  write the rest of the message.
+    if (more)
+        return true;
+
+    while (active > 0) {
+        if (pipes [current]->check_write ())
+            return true;
+
+        active--;
+        if (current < active)
+            pipes.swap (current, active);
+        else
+            current = 0;
+    }
+
+    return false;
+}
+
diff --git a/src/lb.hpp b/src/lb.hpp
new file mode 100644
index 0000000..526a727
--- /dev/null
+++ b/src/lb.hpp
@@ -0,0 +1,65 @@
+/*
+    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_LB_HPP_INCLUDED__
+#define __ZMQ_LB_HPP_INCLUDED__
+
+#include "yarray.hpp"
+
+namespace zmq
+{
+
+    //  Class manages a set of outbound pipes. On send it load balances
+    //  messages fairly among the pipes.
+    class lb_t
+    {
+    public:
+
+        lb_t ();
+        ~lb_t ();
+
+        void attach (class writer_t *pipe_);
+        void detach (class writer_t *pipe_);
+        void revive (class writer_t *pipe_);
+        int send (zmq_msg_t *msg_, int flags_);
+        bool has_out ();
+
+    private:
+
+        //  List of outbound pipes.
+        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;
+
+        //  Points to the last pipe that the most recent message was sent to.
+        pipes_t::size_type current;
+
+        //  True if last we are in the middle of a multipart message.
+        bool more;
+
+        lb_t (const lb_t&);
+        void operator = (const lb_t&);
+    };
+
+}
+
+#endif
diff --git a/src/libzmq.pc.in b/src/libzmq.pc.in
new file mode 100644
index 0000000..ba155a3
--- /dev/null
+++ b/src/libzmq.pc.in
@@ -0,0 +1,10 @@
+prefix=@prefix@
+exec_prefix=@exec_prefix@
+libdir=@libdir@
+includedir=@includedir@
+
+Name: libzmq
+Description: 0MQ c++ library
+Version: @VERSION@
+Libs: -L${libdir} -lzmq
+Cflags: -I${includedir}
diff --git a/src/likely.hpp b/src/likely.hpp
new file mode 100644
index 0000000..b7a8171
--- /dev/null
+++ b/src/likely.hpp
@@ -0,0 +1,32 @@
+/*
+    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_LIKELY_HPP_INCLUDED__
+#define __ZMQ_LIKELY_HPP_INCLUDED__
+
+#if defined __GNUC__
+#define likely(x) __builtin_expect ((x), 1)
+#define unlikely(x) __builtin_expect ((x), 0)
+#else
+#define likely(x) (x)
+#define unlikely(x) (x)
+#endif
+
+
+#endif
diff --git a/src/msg_content.hpp b/src/msg_content.hpp
new file mode 100644
index 0000000..d409d45
--- /dev/null
+++ b/src/msg_content.hpp
@@ -0,0 +1,51 @@
+/*
+    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_MSG_HPP_INCLUDE__
+#define __ZMQ_MSG_HPP_INCLUDE__
+
+#include <stddef.h>
+
+#include "../include/zmq.h"
+
+#include "atomic_counter.hpp"
+
+namespace zmq
+{
+
+    //  Shared message buffer. Message data are either allocated in one
+    //  continuous block along with this structure - thus avoiding one
+    //  malloc/free pair or they are stored in used-supplied memory.
+    //  In the latter case, ffn member stores pointer to the function to be
+    //  used to deallocate the data. If the buffer is actually shared (there
+    //  are at least 2 references to it) refcount member contains number of
+    //  references.
+
+    struct msg_content_t
+    {
+        void *data;
+        size_t size;
+        zmq_free_fn *ffn;
+        void *hint;
+        zmq::atomic_counter_t refcnt;
+    };
+
+}
+
+#endif
diff --git a/src/mutex.hpp b/src/mutex.hpp
new file mode 100644
index 0000000..3306d2e
--- /dev/null
+++ b/src/mutex.hpp
@@ -0,0 +1,120 @@
+/*
+    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_MUTEX_HPP_INCLUDED__
+#define __ZMQ_MUTEX_HPP_INCLUDED__
+
+#include "platform.hpp"
+#include "err.hpp"
+
+//  Mutex class encapsulates OS mutex in a platform-independent way.
+
+#ifdef ZMQ_HAVE_WINDOWS
+
+#include "windows.hpp"
+
+namespace zmq
+{
+
+    class mutex_t
+    {
+    public:
+        inline mutex_t ()
+        {
+            InitializeCriticalSection (&cs);
+        }
+
+        inline ~mutex_t ()
+        {
+            DeleteCriticalSection (&cs);
+        }
+
+        inline void lock ()
+        {
+            EnterCriticalSection (&cs);
+        }
+
+        inline void unlock ()
+        {
+            LeaveCriticalSection (&cs);
+        }
+
+    private:
+
+        CRITICAL_SECTION cs;
+
+        //  Disable copy construction and assignment.
+        mutex_t (const mutex_t&);
+        void operator = (const mutex_t&);
+    };
+
+}
+
+#else
+
+#include <pthread.h>
+
+namespace zmq
+{
+ 
+    class mutex_t
+    {
+    public:
+        inline mutex_t ()
+        {
+            int rc = pthread_mutex_init (&mutex, NULL);
+            if (rc)
+                posix_assert (rc);
+        }
+ 
+        inline ~mutex_t ()
+        {
+            int rc = pthread_mutex_destroy (&mutex);
+            if (rc)
+                posix_assert (rc);
+        }
+ 
+        inline void lock ()
+        {
+            int rc = pthread_mutex_lock (&mutex);
+            if (rc)
+                posix_assert (rc);
+        }
+ 
+        inline void unlock ()
+        {
+            int rc = pthread_mutex_unlock (&mutex);
+            if (rc)
+                posix_assert (rc);
+        }
+ 
+    private:
+ 
+        pthread_mutex_t mutex;
+ 
+        // Disable copy construction and assignment.
+        mutex_t (const mutex_t&);
+        void operator = (const mutex_t&);
+    };
+ 
+}
+
+#endif
+
+#endif
diff --git a/src/object.cpp b/src/object.cpp
new file mode 100644
index 0000000..324450f
--- /dev/null
+++ b/src/object.cpp
@@ -0,0 +1,374 @@
+/*
+    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 <string.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_) :
+    ctx (ctx_),
+    thread_slot (thread_slot_)
+{
+}
+
+zmq::object_t::object_t (object_t *parent_) :
+    ctx (parent_->ctx),
+    thread_slot (parent_->thread_slot)
+{
+}
+
+zmq::object_t::~object_t ()
+{
+}
+
+uint32_t zmq::object_t::get_thread_slot ()
+{
+    return thread_slot;
+}
+
+zmq::ctx_t *zmq::object_t::get_ctx ()
+{
+    return ctx;
+}
+
+void zmq::object_t::process_command (command_t &cmd_)
+{
+    switch (cmd_.type) {
+
+    case command_t::revive:
+        process_revive ();
+        break;
+
+    case command_t::stop:
+        process_stop ();
+        break;
+
+    case command_t::plug:
+        process_plug ();
+        process_seqnum ();
+        return;
+
+    case command_t::own:
+        process_own (cmd_.args.own.object);
+        process_seqnum ();
+        break;
+
+    case command_t::attach:
+        process_attach (cmd_.args.attach.engine,
+            blob_t (cmd_.args.attach.peer_identity,
+            cmd_.args.attach.peer_identity_size));
+        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));
+        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;
+
+    case command_t::pipe_term_ack:
+        process_pipe_term_ack ();
+        break;
+
+    case command_t::term_req:
+        process_term_req (cmd_.args.term_req.object);
+        break;
+    
+    case command_t::term:
+        process_term ();
+        break;
+
+    case command_t::term_ack:
+        process_term_ack ();
+        break;
+
+    default:
+        zmq_assert (false);
+    }
+
+    //  The assumption here is that each command is processed once only,
+    //  so deallocating it after processing is all right.
+    deallocate_command (&cmd_);
+}
+
+void zmq::object_t::register_pipe (class pipe_t *pipe_)
+{
+    ctx->register_pipe (pipe_);
+}
+
+void zmq::object_t::unregister_pipe (class pipe_t *pipe_)
+{
+    ctx->unregister_pipe (pipe_);
+}
+
+int zmq::object_t::register_endpoint (const char *addr_, socket_base_t *socket_)
+{
+    return ctx->register_endpoint (addr_, socket_);
+}
+
+void zmq::object_t::unregister_endpoints (socket_base_t *socket_)
+{
+    return ctx->unregister_endpoints (socket_);
+}
+
+zmq::socket_base_t *zmq::object_t::find_endpoint (const char *addr_)
+{
+    return ctx->find_endpoint (addr_);
+}
+
+zmq::io_thread_t *zmq::object_t::choose_io_thread (uint64_t taskset_)
+{
+    return ctx->choose_io_thread (taskset_);
+}
+
+void zmq::object_t::send_stop ()
+{
+    //  'stop' command goes always from administrative thread to
+    //  the current object. 
+    command_t cmd;
+    cmd.destination = this;
+    cmd.type = command_t::stop;
+    ctx->send_command (thread_slot, cmd);
+}
+
+void zmq::object_t::send_plug (owned_t *destination_, bool inc_seqnum_)
+{
+    if (inc_seqnum_)
+        destination_->inc_seqnum ();
+
+    command_t cmd;
+    cmd.destination = destination_;
+    cmd.type = command_t::plug;
+    send_command (cmd);
+}
+
+void zmq::object_t::send_own (socket_base_t *destination_, owned_t *object_)
+{
+    destination_->inc_seqnum ();
+    command_t cmd;
+    cmd.destination = destination_;
+    cmd.type = command_t::own;
+    cmd.args.own.object = object_;
+    send_command (cmd);
+}
+
+void zmq::object_t::send_attach (session_t *destination_, i_engine *engine_,
+    const blob_t &peer_identity_, bool inc_seqnum_)
+{
+    if (inc_seqnum_)
+        destination_->inc_seqnum ();
+
+    command_t cmd;
+    cmd.destination = destination_;
+    cmd.type = command_t::attach;
+    cmd.args.attach.engine = engine_;
+    if (peer_identity_.empty ()) {
+        cmd.args.attach.peer_identity_size = 0;
+        cmd.args.attach.peer_identity = NULL;
+    }
+    else {
+        zmq_assert (peer_identity_.size () <= 0xff);
+        cmd.args.attach.peer_identity_size =
+            (unsigned char) peer_identity_.size ();
+        cmd.args.attach.peer_identity =
+            (unsigned char*) malloc (peer_identity_.size ());
+        zmq_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_)
+{
+    if (inc_seqnum_)
+        destination_->inc_seqnum ();
+
+    command_t cmd;
+    cmd.destination = destination_;
+    cmd.type = command_t::bind;
+    cmd.args.bind.in_pipe = in_pipe_;
+    cmd.args.bind.out_pipe = out_pipe_;
+    if (peer_identity_.empty ()) {
+        cmd.args.bind.peer_identity_size = 0;
+        cmd.args.bind.peer_identity = NULL;
+    }
+    else {
+        zmq_assert (peer_identity_.size () <= 0xff);
+        cmd.args.bind.peer_identity_size =
+            (unsigned char) peer_identity_.size ();
+        cmd.args.bind.peer_identity =
+            (unsigned char*) malloc (peer_identity_.size ());
+        zmq_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_)
+{
+    command_t cmd;
+    cmd.destination = destination_;
+    cmd.type = command_t::revive;
+    send_command (cmd);
+}
+
+void zmq::object_t::send_reader_info (writer_t *destination_,
+    uint64_t msgs_read_)
+{
+    command_t cmd;
+    cmd.destination = destination_;
+    cmd.type = command_t::reader_info;
+    cmd.args.reader_info.msgs_read = msgs_read_;
+    send_command (cmd);
+}
+
+void zmq::object_t::send_pipe_term (writer_t *destination_)
+{
+    command_t cmd;
+    cmd.destination = destination_;
+    cmd.type = command_t::pipe_term;
+    send_command (cmd);
+}
+
+void zmq::object_t::send_pipe_term_ack (reader_t *destination_)
+{
+    command_t cmd;
+    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_)
+{
+    command_t cmd;
+    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_)
+{
+    command_t cmd;
+    cmd.destination = destination_;
+    cmd.type = command_t::term;
+    send_command (cmd);
+}
+
+void zmq::object_t::send_term_ack (socket_base_t *destination_)
+{
+    command_t cmd;
+    cmd.destination = destination_;
+    cmd.type = command_t::term_ack;
+    send_command (cmd);
+}
+
+void zmq::object_t::process_stop ()
+{
+    zmq_assert (false);
+}
+
+void zmq::object_t::process_plug ()
+{
+    zmq_assert (false);
+}
+
+void zmq::object_t::process_own (owned_t *object_)
+{
+    zmq_assert (false);
+}
+
+void zmq::object_t::process_attach (i_engine *engine_,
+    const blob_t &peer_identity_)
+{
+    zmq_assert (false);
+}
+
+void zmq::object_t::process_bind (reader_t *in_pipe_, writer_t *out_pipe_,
+    const blob_t &peer_identity_)
+{
+    zmq_assert (false);
+}
+
+void zmq::object_t::process_revive ()
+{
+    zmq_assert (false);
+}
+
+void zmq::object_t::process_reader_info (uint64_t msgs_read_)
+{
+    zmq_assert (false);
+}
+
+void zmq::object_t::process_pipe_term ()
+{
+    zmq_assert (false);
+}
+
+void zmq::object_t::process_pipe_term_ack ()
+{
+    zmq_assert (false);
+}
+
+void zmq::object_t::process_term_req (owned_t *object_)
+{
+    zmq_assert (false);
+}
+
+void zmq::object_t::process_term ()
+{
+    zmq_assert (false);
+}
+
+void zmq::object_t::process_term_ack ()
+{
+    zmq_assert (false);
+}
+
+void zmq::object_t::process_seqnum ()
+{
+    zmq_assert (false);
+}
+
+void zmq::object_t::send_command (command_t &cmd_)
+{
+    ctx->send_command (cmd_.destination->get_thread_slot (), cmd_);
+}
+
diff --git a/src/object.hpp b/src/object.hpp
new file mode 100644
index 0000000..a38b0a6
--- /dev/null
+++ b/src/object.hpp
@@ -0,0 +1,118 @@
+/*
+    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_OBJECT_HPP_INCLUDED__
+#define __ZMQ_OBJECT_HPP_INCLUDED__
+
+#include "stdint.hpp"
+#include "blob.hpp"
+
+namespace zmq
+{
+    //  Base class for all objects that participate in inter-thread
+    //  communication.
+
+    class object_t
+    {
+    public:
+
+        object_t (class ctx_t *ctx_, uint32_t thread_slot_);
+        object_t (object_t *parent_);
+        virtual ~object_t ();
+
+        uint32_t get_thread_slot ();
+        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_);
+        void unregister_endpoints (class socket_base_t *socket_);
+        class socket_base_t *find_endpoint (const char *addr_);
+
+        //  Chooses least loaded I/O thread.
+        class io_thread_t *choose_io_thread (uint64_t taskset_);
+
+        //  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_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_,
+             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_,
+             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_);
+
+        //  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_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_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_ack ();
+
+        //  Special handler called after a command that requires a seqnum
+        //  was processed. The implementation should catch up with its counter
+        //  of processed commands here.
+        virtual void process_seqnum ();
+
+    private:
+
+        //  Context provides access to the global state.
+        class ctx_t *ctx;
+
+        //  Slot ID of the thread the object belongs to.
+        uint32_t thread_slot;
+
+        void send_command (command_t &cmd_);
+
+        object_t (const object_t&);
+        void operator = (const object_t&);
+    };
+
+}
+
+#endif
diff --git a/src/options.cpp b/src/options.cpp
new file mode 100644
index 0000000..f6b24d6
--- /dev/null
+++ b/src/options.cpp
@@ -0,0 +1,225 @@
+/*
+    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 <string.h>
+
+#include "../include/zmq.h"
+
+#include "options.hpp"
+#include "err.hpp"
+
+zmq::options_t::options_t () :
+    hwm (0),
+    swap (0),
+    affinity (0),
+    rate (100),
+    recovery_ivl (10),
+    use_multicast_loop (true),
+    sndbuf (0),
+    rcvbuf (0),
+    requires_in (false),
+    requires_out (false),
+    immediate_connect (true)
+{
+}
+
+int zmq::options_t::setsockopt (int option_, const void *optval_,
+    size_t optvallen_)
+{
+    switch (option_) {
+
+    case ZMQ_HWM:
+        if (optvallen_ != sizeof (uint64_t)) {
+            errno = EINVAL;
+            return -1;
+        }
+        hwm = *((uint64_t*) optval_);
+        return 0;
+
+    case ZMQ_SWAP:
+        if (optvallen_ != sizeof (int64_t)) {
+            errno = EINVAL;
+            return -1;
+        }
+        swap = *((int64_t*) optval_);
+        return 0;
+
+    case ZMQ_AFFINITY:
+        if (optvallen_ != sizeof (uint64_t)) {
+            errno = EINVAL;
+            return -1;
+        }
+        affinity = *((uint64_t*) optval_);
+        return 0;
+
+    case ZMQ_IDENTITY:
+
+        //  Empty identity is invalid as well as identity longer than
+        //  255 bytes. Identity starting with binary zero is invalid
+        //  as these are used for auto-generated identities.
+        if (optvallen_ < 1 || optvallen_ > 255 ||
+              *((const unsigned char*) optval_) == 0) {
+            errno = EINVAL;
+            return -1;
+        }
+        identity.assign ((const unsigned char*) optval_, optvallen_);
+        return 0;
+
+    case ZMQ_RATE:
+        if (optvallen_ != sizeof (int64_t)) {
+            errno = EINVAL;
+            return -1;
+        }
+        rate = (uint32_t) *((int64_t*) optval_);
+        return 0;
+        
+    case ZMQ_RECOVERY_IVL:
+        if (optvallen_ != sizeof (int64_t)) {
+            errno = EINVAL;
+            return -1;
+        }
+        recovery_ivl = (uint32_t) *((int64_t*) optval_);
+        return 0;
+
+    case ZMQ_MCAST_LOOP:
+        if (optvallen_ != sizeof (int64_t)) {
+            errno = EINVAL;
+            return -1;
+        }
+        if ((int64_t) *((int64_t*) optval_) == 0)
+            use_multicast_loop = false;
+        else if ((int64_t) *((int64_t*) optval_) == 1)
+            use_multicast_loop = true;
+        else {
+            errno = EINVAL;
+            return -1;
+        }
+        return 0;
+
+    case ZMQ_SNDBUF:
+        if (optvallen_ != sizeof (uint64_t)) {
+            errno = EINVAL;
+            return -1;
+        }
+        sndbuf = *((uint64_t*) optval_);
+        return 0;
+
+    case ZMQ_RCVBUF:
+        if (optvallen_ != sizeof (uint64_t)) {
+            errno = EINVAL;
+            return -1;
+        }
+        rcvbuf = *((uint64_t*) optval_);
+        return 0;
+    }
+
+    errno = EINVAL;
+    return -1;
+}
+
+int zmq::options_t::getsockopt (int option_, void *optval_, size_t *optvallen_)
+{
+    switch (option_) {
+
+    case ZMQ_HWM:
+        if (*optvallen_ < sizeof (uint64_t)) {
+            errno = EINVAL;
+            return -1;
+        }
+        *((uint64_t*) optval_) = hwm;
+        *optvallen_ = sizeof (uint64_t);
+        return 0;
+
+    case ZMQ_SWAP:
+        if (*optvallen_ < sizeof (int64_t)) {
+            errno = EINVAL;
+            return -1;
+        }
+        *((int64_t*) optval_) = swap;
+        *optvallen_ = sizeof (int64_t);
+        return 0;
+
+    case ZMQ_AFFINITY:
+        if (*optvallen_ < sizeof (uint64_t)) {
+            errno = EINVAL;
+            return -1;
+        }
+        *((uint64_t*) optval_) = affinity;
+        *optvallen_ = sizeof (uint64_t);
+        return 0;
+
+    case ZMQ_IDENTITY:
+        if (*optvallen_ < identity.size ()) {
+            errno = EINVAL;
+            return -1;
+        }
+        memcpy (optval_, identity.data (), identity.size ());
+        *optvallen_ = identity.size ();
+        return 0;
+
+
+    case ZMQ_RATE:
+        if (*optvallen_ < sizeof (int64_t)) {
+            errno = EINVAL;
+            return -1;
+        }
+        *((int64_t*) optval_) = rate;
+        *optvallen_ = sizeof (int64_t);
+        return 0;
+        
+    case ZMQ_RECOVERY_IVL:
+        if (*optvallen_ < sizeof (int64_t)) {
+            errno = EINVAL;
+            return -1;
+        }
+        *((int64_t*) optval_) = recovery_ivl;
+        *optvallen_ = sizeof (int64_t);
+        return 0;
+
+    case ZMQ_MCAST_LOOP:
+        if (*optvallen_ < sizeof (int64_t)) {
+            errno = EINVAL;
+            return -1;
+        }
+        *((int64_t*) optval_) = use_multicast_loop ? 1 : 0;
+        *optvallen_ = sizeof (int64_t);
+        return 0;
+
+    case ZMQ_SNDBUF:
+        if (*optvallen_ < sizeof (uint64_t)) {
+            errno = EINVAL;
+            return -1;
+        }
+        *((uint64_t*) optval_) = sndbuf;
+        *optvallen_ = sizeof (uint64_t);
+        return 0;
+
+    case ZMQ_RCVBUF:
+        if (*optvallen_ < sizeof (uint64_t)) {
+            errno = EINVAL;
+            return -1;
+        }
+        *((uint64_t*) optval_) = rcvbuf;
+        *optvallen_ = sizeof (uint64_t);
+        return 0;
+    }
+
+    errno = EINVAL;
+    return -1;
+}
diff --git a/src/options.hpp b/src/options.hpp
new file mode 100644
index 0000000..908b166
--- /dev/null
+++ b/src/options.hpp
@@ -0,0 +1,68 @@
+/*
+    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_OPTIONS_HPP_INCLUDED__
+#define __ZMQ_OPTIONS_HPP_INCLUDED__
+
+#include "stddef.h"
+#include "stdint.hpp"
+#include "blob.hpp"
+
+namespace zmq
+{
+
+    struct options_t
+    {
+        options_t ();
+
+        int setsockopt (int option_, const void *optval_, size_t optvallen_);
+        int getsockopt (int option_, void *optval_, size_t *optvallen_);
+
+        uint64_t hwm;
+        int64_t swap;
+        uint64_t affinity;
+        blob_t identity;
+
+        //  Maximum tranfer rate [kb/s]. Default 100kb/s.
+        uint32_t rate;
+
+        //  Reliability time interval [s]. Default 10s.
+        uint32_t recovery_ivl;
+
+        //  Enable multicast loopback. Default disabled (false).
+        bool use_multicast_loop;
+
+        uint64_t sndbuf;
+        uint64_t rcvbuf;
+
+        //  These options are never set by the user directly. Instead they are
+        //  provided by the specific socket type.
+        bool requires_in;
+        bool requires_out;
+
+        //  If true, when connecting, pipes are created immediately without
+        //  waiting for the connection to be established. That way the socket
+        //  is not aware of the peer's identity, however, it is able to send
+        //  messages straight away.
+        bool immediate_connect;
+    };
+
+}
+
+#endif
diff --git a/src/owned.cpp b/src/owned.cpp
new file mode 100644
index 0000000..d6be444
--- /dev/null
+++ b/src/owned.cpp
@@ -0,0 +1,71 @@
+/*
+    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
new file mode 100644
index 0000000..91189a1
--- /dev/null
+++ b/src/owned.hpp
@@ -0,0 +1,89 @@
+/*
+    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
new file mode 100644
index 0000000..31524de
--- /dev/null
+++ b/src/pair.cpp
@@ -0,0 +1,139 @@
+/*
+    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 "pair.hpp"
+#include "err.hpp"
+#include "pipe.hpp"
+
+zmq::pair_t::pair_t (class app_thread_t *parent_) :
+    socket_base_t (parent_),
+    inpipe (NULL),
+    outpipe (NULL),
+    alive (true)
+{
+    options.requires_in = true;
+    options.requires_out = true;
+}
+
+zmq::pair_t::~pair_t ()
+{
+    if (inpipe)
+        inpipe->term ();
+    if (outpipe)
+        outpipe->term ();
+}
+
+void zmq::pair_t::xattach_pipes (class reader_t *inpipe_,
+    class writer_t *outpipe_, const blob_t &peer_identity_)
+{
+    zmq_assert (!inpipe && !outpipe);
+    inpipe = inpipe_;
+    outpipe = outpipe_;
+    outpipe_alive = true;
+}
+
+void zmq::pair_t::xdetach_inpipe (class reader_t *pipe_)
+{
+    zmq_assert (pipe_ == inpipe);
+    inpipe = NULL;
+}
+
+void zmq::pair_t::xdetach_outpipe (class writer_t *pipe_)
+{
+    zmq_assert (pipe_ == outpipe);
+    outpipe = NULL;
+}
+
+void zmq::pair_t::xkill (class reader_t *pipe_)
+{
+    zmq_assert (alive);
+    alive = false;
+}
+
+void zmq::pair_t::xrevive (class reader_t *pipe_)
+{
+    zmq_assert (!alive);
+    alive = true;
+}
+
+void zmq::pair_t::xrevive (class writer_t *pipe_)
+{
+    zmq_assert (!outpipe_alive);
+    outpipe_alive = true;
+}
+
+int zmq::pair_t::xsetsockopt (int option_, const void *optval_,
+    size_t optvallen_)
+{
+    errno = EINVAL;
+    return -1;
+}
+
+int zmq::pair_t::xsend (zmq_msg_t *msg_, int flags_)
+{
+    if (outpipe == NULL || !outpipe_alive) {
+        errno = EAGAIN;
+        return -1;
+    }
+
+    if (!outpipe->write (msg_)) {
+        outpipe_alive = false;
+        errno = EAGAIN;
+        return -1;
+    }
+
+    outpipe->flush ();
+
+    //  Detach the original message from the data buffer.
+    int rc = zmq_msg_init (msg_);
+    zmq_assert (rc == 0);
+
+    return 0;
+}
+
+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_)) {
+        errno = EAGAIN;
+        return -1;
+    }
+    return 0;
+}
+
+bool zmq::pair_t::xhas_in ()
+{
+    if (alive && inpipe && inpipe->check_read ())
+        return true;
+    return false;
+}
+
+bool zmq::pair_t::xhas_out ()
+{
+    if (outpipe == NULL || !outpipe_alive)
+        return false;
+
+    outpipe_alive = outpipe->check_write ();
+    return outpipe_alive;
+}
+
diff --git a/src/pair.hpp b/src/pair.hpp
new file mode 100644
index 0000000..aea249f
--- /dev/null
+++ b/src/pair.hpp
@@ -0,0 +1,63 @@
+/*
+    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_PAIR_HPP_INCLUDED__
+#define __ZMQ_PAIR_HPP_INCLUDED__
+
+#include "socket_base.hpp"
+
+namespace zmq
+{
+
+    class pair_t : public socket_base_t
+    {
+    public:
+
+        pair_t (class app_thread_t *parent_);
+        ~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 ();
+
+    private:
+
+        class reader_t *inpipe;
+        class writer_t *outpipe;
+
+        bool alive;
+        bool outpipe_alive;
+
+        pair_t (const pair_t&);
+        void operator = (const pair_t&);
+    };
+
+}
+
+#endif
diff --git a/src/pgm_receiver.cpp b/src/pgm_receiver.cpp
new file mode 100644
index 0000000..048c529
--- /dev/null
+++ b/src/pgm_receiver.cpp
@@ -0,0 +1,217 @@
+/*
+    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 "platform.hpp"
+
+#if defined ZMQ_HAVE_OPENPGM
+
+#include <new>
+
+#ifdef ZMQ_HAVE_WINDOWS
+#include "windows.hpp"
+#endif
+
+#include "pgm_receiver.hpp"
+#include "err.hpp"
+#include "stdint.hpp"
+#include "wire.hpp"
+#include "i_inout.hpp"
+
+zmq::pgm_receiver_t::pgm_receiver_t (class io_thread_t *parent_, 
+      const options_t &options_) :
+    io_object_t (parent_),
+    pgm_socket (true, options_),
+    options (options_),
+    inout (NULL),
+    mru_decoder (NULL),
+    pending_bytes (0)
+{
+}
+
+zmq::pgm_receiver_t::~pgm_receiver_t ()
+{
+    //  Destructor should not be called before unplug.
+    zmq_assert (peers.empty ());
+}
+
+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_)
+{
+    //  Retrieve PGM fds and start polling.
+    int socket_fd;
+    int waiting_pipe_fd;
+    pgm_socket.get_receiver_fds (&socket_fd, &waiting_pipe_fd);
+    socket_handle = add_fd (socket_fd);
+    pipe_handle = add_fd (waiting_pipe_fd);
+    set_pollin (pipe_handle);
+    set_pollin (socket_handle);
+
+    inout = inout_;
+}
+
+void zmq::pgm_receiver_t::unplug ()
+{
+    //  Delete decoders.
+    for (peers_t::iterator it = peers.begin (); it != peers.end (); it++) {
+        if (it->second.decoder != NULL)
+            delete it->second.decoder;
+    }
+    peers.clear ();
+
+    mru_decoder = NULL;
+    pending_bytes = 0;
+
+    //  Stop polling.
+    rm_fd (socket_handle);
+    rm_fd (pipe_handle);
+
+    inout = NULL;
+}
+
+void zmq::pgm_receiver_t::revive ()
+{
+    zmq_assert (false);
+}
+
+void zmq::pgm_receiver_t::resume_input ()
+{
+    //  It is possible that the most recently used decoder
+    //  processed the whole buffer but failed to write
+    //  the last message into the pipe.
+    if (pending_bytes == 0) {
+        if (mru_decoder != NULL)
+            mru_decoder->process_buffer (NULL, 0);
+        return;
+    }
+
+    zmq_assert (mru_decoder != NULL);
+    zmq_assert (pending_ptr != NULL);
+
+    //  Ask the decoder to process remaining data.
+    size_t n = mru_decoder->process_buffer (pending_ptr, pending_bytes);
+    pending_bytes -= n;
+
+    if (pending_bytes > 0)
+        return;
+
+    //  Resume polling.
+    set_pollin (pipe_handle);
+    set_pollin (socket_handle);
+
+    in_event ();
+}
+
+void zmq::pgm_receiver_t::in_event ()
+{
+    // Read data from the underlying pgm_socket.
+    unsigned char *data = NULL;
+    const pgm_tsi_t *tsi = NULL;
+
+    zmq_assert (pending_bytes == 0);
+
+    //  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);
+
+        //  No data to process. This may happen if the packet received is
+        //  neither ODATA nor ODATA.
+        if (received == 0)
+            break;
+
+        //  Find the peer based on its TSI.
+        peers_t::iterator it = peers.find (*tsi);
+
+        //  Data loss. Delete decoder and mark the peer as disjoint.
+        if (received == -1) {
+            if (it != peers.end ()) {
+                it->second.joined = false;
+                if (it->second.decoder == mru_decoder)
+                    mru_decoder = NULL;
+                if (it->second.decoder != NULL) {
+                    delete it->second.decoder;
+                    it->second.decoder = NULL;
+                }
+            }
+            break;
+        }
+
+        //  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;
+        }
+
+        //  Read the offset of the fist message in the current packet.
+        zmq_assert ((size_t) received >= sizeof (uint16_t));
+        uint16_t offset = get_uint16 (data);
+        data += sizeof (uint16_t);
+        received -= sizeof (uint16_t);
+
+        //  Join the stream if needed.
+        if (!it->second.joined) {
+
+            //  There is no beginning of the message in current packet.
+            //  Ignore the data.
+            if (offset == 0xffff)
+                continue;
+
+            zmq_assert (offset <= received);
+            zmq_assert (it->second.decoder == NULL);
+
+            //  We have to move data to the begining of the first message.
+            data += offset;
+            received -= offset;
+
+            //  Mark the stream as joined.
+            it->second.joined = true;
+
+            //  Create and connect decoder for the peer.
+            it->second.decoder = new (std::nothrow) zmq_decoder_t (0);
+            it->second.decoder->set_inout (inout);
+        }
+
+        mru_decoder = it->second.decoder;
+
+        //  Push all the data to the decoder.
+        ssize_t processed = it->second.decoder->process_buffer (data, received);
+        if (processed < received) {
+            //  Save some state so we can resume the decoding process later.
+            pending_bytes = received - processed;
+            pending_ptr = data + processed;
+            //  Stop polling.
+            reset_pollin (pipe_handle);
+            reset_pollin (socket_handle);
+
+            break;
+        }
+    }
+
+    //  Flush any messages decoder may have produced.
+    inout->flush ();
+}
+
+#endif
+
diff --git a/src/pgm_receiver.hpp b/src/pgm_receiver.hpp
new file mode 100644
index 0000000..1b367bf
--- /dev/null
+++ b/src/pgm_receiver.hpp
@@ -0,0 +1,122 @@
+/*
+    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_PGM_RECEIVER_HPP_INCLUDED__
+#define __ZMQ_PGM_RECEIVER_HPP_INCLUDED__
+
+#include "platform.hpp"
+
+#if defined ZMQ_HAVE_OPENPGM
+
+#ifdef ZMQ_HAVE_WINDOWS
+#include "windows.hpp"
+#endif
+
+#include <map>
+#include <algorithm>
+
+#include "io_object.hpp"
+#include "i_engine.hpp"
+#include "options.hpp"
+#include "zmq_decoder.hpp"
+#include "pgm_socket.hpp"
+
+namespace zmq
+{
+
+    class pgm_receiver_t : public io_object_t, public i_engine
+    {
+    
+    public:
+
+        pgm_receiver_t (class io_thread_t *parent_, const options_t &options_);
+        ~pgm_receiver_t ();
+
+        int init (bool udp_encapsulation_, const char *network_);
+
+        //  i_engine interface implementation.
+        void plug (struct i_inout *inout_);
+        void unplug ();
+        void revive ();
+        void resume_input ();
+
+        //  i_poll_events interface implementation.
+        void in_event ();
+
+    private:
+
+        //  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;
+        };
+
+        struct tsi_comp
+        {
+            inline 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));
+            }
+        };
+
+        typedef std::map <pgm_tsi_t, peer_info_t, tsi_comp> peers_t;
+        peers_t peers;
+
+        //  PGM socket.
+        pgm_socket_t pgm_socket;
+
+        //  Socket options.
+        options_t options;
+
+        //  Parent session.
+        i_inout *inout;
+
+        //  Most recently used decoder.
+        zmq_decoder_t *mru_decoder;
+
+        //  Number of bytes not consumed by the decoder due to pipe overflow.
+        size_t pending_bytes;
+
+        //  Pointer to data still waiting to be processed by the decoder.
+        unsigned char *pending_ptr;
+
+        //  Poll handle associated with PGM socket.
+        handle_t socket_handle;
+
+        //  Poll handle associated with engine PGM waiting pipe.
+        handle_t pipe_handle;
+
+        pgm_receiver_t (const pgm_receiver_t&);
+        void operator = (const pgm_receiver_t&);
+    };
+
+}
+
+#endif
+
+#endif
diff --git a/src/pgm_sender.cpp b/src/pgm_sender.cpp
new file mode 100644
index 0000000..9aeb7a9
--- /dev/null
+++ b/src/pgm_sender.cpp
@@ -0,0 +1,160 @@
+/*
+    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 "platform.hpp"
+
+#if defined ZMQ_HAVE_OPENPGM
+
+#ifdef ZMQ_HAVE_WINDOWS
+#include "windows.hpp"
+#endif
+
+#include <stdlib.h>
+
+#include "io_thread.hpp"
+#include "pgm_sender.hpp"
+#include "err.hpp"
+#include "wire.hpp"
+#include "stdint.hpp"
+
+zmq::pgm_sender_t::pgm_sender_t (io_thread_t *parent_, 
+      const options_t &options_) :
+    io_object_t (parent_),
+    encoder (0),
+    pgm_socket (false, options_),
+    options (options_),
+    out_buffer (NULL),
+    out_buffer_size (0),
+    write_size (0)
+{
+}
+
+int zmq::pgm_sender_t::init (bool udp_encapsulation_, const char *network_)
+{
+    int rc = pgm_socket.init (udp_encapsulation_, network_);
+    if (rc != 0)
+        return rc;
+
+    out_buffer_size = pgm_socket.get_max_tsdu_size ();
+    out_buffer = (unsigned char*) malloc (out_buffer_size);
+    zmq_assert (out_buffer);
+
+    return rc;
+}
+
+void zmq::pgm_sender_t::plug (i_inout *inout_)
+{
+    //  Alocate 2 fds for PGM socket.
+    int downlink_socket_fd = 0;
+    int uplink_socket_fd = 0;
+    int rdata_notify_fd = 0;
+    int pending_notify_fd = 0;
+
+    encoder.set_inout (inout_);
+
+    //  Fill fds from PGM transport and add them to the poller.
+    pgm_socket.get_sender_fds (&downlink_socket_fd, &uplink_socket_fd,
+        &rdata_notify_fd, &pending_notify_fd);
+
+    handle = add_fd (downlink_socket_fd);
+    uplink_handle = add_fd (uplink_socket_fd);
+    rdata_notify_handle = add_fd (rdata_notify_fd);   
+    pending_notify_handle = add_fd (pending_notify_fd);
+
+    //  Set POLLIN. We wont never want to stop polling for uplink = we never
+    //  want to stop porocess NAKs.
+    set_pollin (uplink_handle);
+    set_pollin (rdata_notify_handle);
+    set_pollin (pending_notify_handle);
+
+    //  Set POLLOUT for downlink_socket_handle.
+    set_pollout (handle);
+}
+
+void zmq::pgm_sender_t::unplug ()
+{
+    rm_fd (handle);
+    rm_fd (uplink_handle);
+    rm_fd (rdata_notify_handle);
+    rm_fd (pending_notify_handle);
+    encoder.set_inout (NULL);
+}
+
+void zmq::pgm_sender_t::revive ()
+{
+    set_pollout (handle);
+    out_event ();
+}
+
+void zmq::pgm_sender_t::resume_input ()
+{
+    zmq_assert (false);
+}
+
+zmq::pgm_sender_t::~pgm_sender_t ()
+{
+    if (out_buffer) {
+        free (out_buffer);
+        out_buffer = NULL;
+    }
+}
+
+void zmq::pgm_sender_t::in_event ()
+{
+    //  In event on sender side means NAK or SPMR receiving from some peer.
+    pgm_socket.process_upstream ();
+}
+
+void zmq::pgm_sender_t::out_event ()
+{
+    //  POLLOUT event from send socket. If write buffer is empty, 
+    //  try to read new data from the encoder.
+    if (write_size == 0) {
+
+        //  First two bytes (sizeof uint16_t) are used to store message 
+        //  offset in following steps. Note that by passing our buffer to
+        //  the get data function we prevent it from returning its own buffer.
+        unsigned char *bf = out_buffer + sizeof (uint16_t);
+        size_t bfsz = out_buffer_size - sizeof (uint16_t);
+        int offset = -1;
+        encoder.get_data (&bf, &bfsz, &offset);
+
+        //  If there are no data to write stop polling for output.
+        if (!bfsz) {
+            reset_pollout (handle);
+            return;
+        }
+
+        //  Put offset information in the buffer.
+        write_size = bfsz + sizeof (uint16_t);
+        put_uint16 (out_buffer, offset == -1 ? 0xffff : (uint16_t) offset);
+    }
+
+    //  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)
+        write_size = 0;
+    else
+        zmq_assert (nbytes == 0);
+}
+
+#endif
+
diff --git a/src/pgm_sender.hpp b/src/pgm_sender.hpp
new file mode 100644
index 0000000..23a53bc
--- /dev/null
+++ b/src/pgm_sender.hpp
@@ -0,0 +1,95 @@
+/*
+    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_PGM_SENDER_HPP_INCLUDED__
+#define __ZMQ_PGM_SENDER_HPP_INCLUDED__
+
+#include "platform.hpp"
+
+#if defined ZMQ_HAVE_OPENPGM
+
+#ifdef ZMQ_HAVE_WINDOWS
+#include "windows.hpp"
+#endif
+
+#include "stdint.hpp"
+#include "io_object.hpp"
+#include "i_engine.hpp"
+#include "options.hpp"
+#include "pgm_socket.hpp"
+#include "zmq_encoder.hpp"
+
+namespace zmq
+{
+
+    class pgm_sender_t : public io_object_t, public i_engine
+    {
+
+    public:
+
+        pgm_sender_t (class io_thread_t *parent_, const options_t &options_);
+        ~pgm_sender_t ();
+
+        int init (bool udp_encapsulation_, const char *network_);
+
+        //  i_engine interface implementation.
+        void plug (struct i_inout *inout_);
+        void unplug ();
+        void revive ();
+        void resume_input ();
+
+        //  i_poll_events interface implementation.
+        void in_event ();
+        void out_event ();
+
+    private:
+
+        //  Message encoder.
+        zmq_encoder_t encoder;
+
+        //  PGM socket.
+        pgm_socket_t pgm_socket;
+
+        //  Socket options.
+        options_t options;
+
+        //  Poll handle associated with PGM socket.
+        handle_t handle;
+        handle_t uplink_handle;
+        handle_t rdata_notify_handle;
+        handle_t pending_notify_handle;
+
+        //  Output buffer from pgm_socket.
+        unsigned char *out_buffer;
+        
+        //  Output buffer size.
+        size_t out_buffer_size;
+
+        //  Number of bytes in the buffer to be written to the socket.
+        //  If zero, there are no data to be sent.
+        size_t write_size;
+
+        pgm_sender_t (const pgm_sender_t&);
+        void operator = (const pgm_sender_t&);
+    };
+
+}
+#endif
+
+#endif
diff --git a/src/pgm_socket.cpp b/src/pgm_socket.cpp
new file mode 100644
index 0000000..5a952a7
--- /dev/null
+++ b/src/pgm_socket.cpp
@@ -0,0 +1,538 @@
+/*
+    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 "platform.hpp"
+
+#ifdef ZMQ_HAVE_OPENPGM
+
+#ifdef ZMQ_HAVE_WINDOWS
+#include "windows.hpp"
+#endif
+
+#ifdef ZMQ_HAVE_LINUX
+#include <poll.h>
+#endif
+
+#include <stdlib.h>
+#include <string.h>
+#include <string>
+
+#include "options.hpp"
+#include "pgm_socket.hpp"
+#include "config.hpp"
+#include "err.hpp"
+#include "uuid.hpp"
+#include "stdint.hpp"
+
+zmq::pgm_socket_t::pgm_socket_t (bool receiver_, const options_t &options_) :
+    transport (NULL),
+    options (options_),
+    receiver (receiver_),
+    pgm_msgv (NULL),
+    pgm_msgv_len (0),
+    nbytes_rec (0),
+    nbytes_processed (0),
+    pgm_msgv_processed (0)
+{
+}
+
+int zmq::pgm_socket_t::init (bool udp_encapsulation_, const char *network_)
+{
+    //  Can not open transport before destroying old one. 
+    zmq_assert (transport == NULL);
+ 
+    //  Parse port number.
+    const char *port_delim = strchr (network_, ':');
+    if (!port_delim) {
+        errno = EINVAL;
+        return -1;
+    }
+
+    uint16_t port_number = atoi (port_delim + 1);
+  
+    char network [256];
+    if (port_delim - network_ >= (int) sizeof (network) - 1) {
+        errno = EINVAL;
+        return -1;
+    }
+    memset (network, '\0', sizeof (network));
+    memcpy (network, network_, port_delim - network_);
+    
+    //  Zero counter used in msgrecv.
+    nbytes_rec = 0;
+    nbytes_processed = 0;
+    pgm_msgv_processed = 0;
+
+    int rc;
+    GError *pgm_error = NULL;
+
+    //  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 {
+
+        //  Generate random gsi.
+        gsi_base = uuid_t ().to_string ();
+    }
+
+    rc = pgm_gsi_create_from_string (&gsi, gsi_base.c_str (), -1);
+    if (rc != TRUE) {
+        errno = EINVAL;
+        return -1;
+    }
+
+    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;
+        }
+
+        zmq_assert (false);
+    }
+
+    res->ti_gsi = gsi;
+    res->ti_dport = port_number;
+
+    //  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;
+    }
+
+    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;
+        }
+
+        zmq_assert (false);
+    }
+
+    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;
+    }
+
+    //  Set maximum number of network hops to cross.
+    rc = pgm_transport_set_hops (transport, 16);
+    if (rc != TRUE) {
+        errno = EINVAL;
+        return -1;
+    }
+
+    //  Set nonblocking send/recv sockets.
+    if (!pgm_transport_set_nonblocking (transport, true)) {
+        errno = EINVAL;
+        return -1;
+    }
+
+    if (receiver) {
+
+        //  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);
+
+        //  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;
+        }
+
+        //  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;
+        }
+
+    } else {
+
+        //  Sender transport.
+
+        //  Waiting pipe won't be read.
+        rc = pgm_transport_set_send_only (transport, TRUE);
+        zmq_assert (rc == TRUE);
+
+        if (options.sndbuf) {
+            rc = pgm_transport_set_sndbuf (transport, (int) options.sndbuf);
+            if (rc != TRUE)
+                return -1;
+        }
+
+        //  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;
+        }
+
+        //  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;
+        }
+
+        //  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);
+    }
+    
+    //  Enable multicast loopback.
+    if (options.use_multicast_loop) {
+        rc = pgm_transport_set_multicast_loop (transport, true);
+        zmq_assert (rc == TRUE);
+    }
+
+    //  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;
+        }
+
+        zmq_assert (false);
+    }
+
+    //  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 ();
+        pgm_msgv_len = (int) in_batch_size / max_tsdu_size;
+        if ((int) in_batch_size % max_tsdu_size)
+            pgm_msgv_len++;
+        zmq_assert (pgm_msgv_len);
+
+        pgm_msgv = (pgm_msgv_t*) malloc (sizeof (pgm_msgv_t) * pgm_msgv_len);
+    }
+
+    return 0;
+}
+
+zmq::pgm_socket_t::~pgm_socket_t ()
+{
+    if (pgm_msgv)
+        free (pgm_msgv);
+    if (transport) 
+        pgm_transport_destroy (transport, TRUE);
+}
+
+//   Get receiver fds. recv_fd is from transport->recv_sock
+//   waiting_pipe_fd is from transport->waiting_pipe [0]
+void zmq::pgm_socket_t::get_receiver_fds (int *receive_fd_, 
+    int *waiting_pipe_fd_)
+{
+    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);
+}
+
+//  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.
+void zmq::pgm_socket_t::get_sender_fds (int *send_fd_, int *receive_fd_, 
+    int *rdata_notify_fd_, int *pending_notify_fd_)
+{
+    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);
+}
+
+//  Send one APDU, transmit window owned memory.
+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);
+
+    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)
+        zmq_assert ((ssize_t) nbytes == (ssize_t) data_len_);
+
+    return nbytes;
+}
+
+//  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);
+}
+
+//  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.
+ssize_t zmq::pgm_socket_t::receive (void **raw_data_, const pgm_tsi_t **tsi_)
+{
+    size_t raw_data_len = 0;
+
+    //  We just sent all data from pgm_transport_recvmsgv up 
+    //  and have to return 0 that another engine in this thread is scheduled.
+    if (nbytes_rec == nbytes_processed && nbytes_rec > 0) {
+
+        //  Reset all the counters.
+        nbytes_rec = 0;
+        nbytes_processed = 0;
+        pgm_msgv_processed = 0;
+        return 0;
+    }
+
+    //  If we have are going first time or if we have processed all pgm_msgv_t
+    //  structure previously read from the pgm socket.
+    if (nbytes_rec == nbytes_processed) {
+
+        //  Check program flow.
+        zmq_assert (pgm_msgv_processed == 0);
+        zmq_assert (nbytes_processed == 0);
+        zmq_assert (nbytes_rec == 0);
+
+        //  Receive a vector of Application Protocol Domain Unit's (APDUs) 
+        //  from the transport.
+        GError *pgm_error = NULL;
+
+        const PGMIOStatus status = pgm_recvmsgv (transport, pgm_msgv,
+            pgm_msgv_len, MSG_DONTWAIT, &nbytes_rec, &pgm_error);
+
+        zmq_assert (status != PGM_IO_STATUS_ERROR);
+
+        //  In a case when no ODATA/RDATA fired POLLIN event (SPM...)
+        //  pgm_recvmsg returns ?.
+        if (status == PGM_IO_STATUS_TIMER_PENDING) {
+
+            zmq_assert (nbytes_rec == 0);
+
+            //  In case if no RDATA/ODATA caused POLLIN 0 is 
+            //  returned.
+            nbytes_rec = 0;
+            return 0;
+        }
+
+        //  Data loss.
+        if (status == PGM_IO_STATUS_RESET) {
+
+            pgm_peer_t* peer = (pgm_peer_t*) transport->peers_pending->data;
+
+            //  Save lost data TSI.
+            *tsi_ = &peer->tsi;
+            nbytes_rec = 0;
+
+            //  In case of dala loss -1 is returned.
+            errno = EINVAL;
+            g_error_free (pgm_error);
+            return -1;
+        }
+
+        zmq_assert (status == PGM_IO_STATUS_NORMAL);
+    }
+    else
+    {
+        zmq_assert (pgm_msgv_processed <= pgm_msgv_len);
+    }
+
+    zmq_assert (nbytes_rec > 0);
+
+    // Only one APDU per pgm_msgv_t structure is allowed.
+    zmq_assert (pgm_msgv [pgm_msgv_processed].msgv_len == 1);
+ 
+    struct pgm_sk_buff_t* skb = 
+        pgm_msgv [pgm_msgv_processed].msgv_skb [0];
+
+    //  Take pointers from pgm_msgv_t structure.
+    *raw_data_ = skb->data;
+    raw_data_len = skb->len;
+
+    //  Save current TSI.
+    *tsi_ = &skb->tsi;
+
+    //  Move the the next pgm_msgv_t structure.
+    pgm_msgv_processed++;
+    zmq_assert (pgm_msgv_processed <= pgm_msgv_len);
+    nbytes_processed +=raw_data_len;
+
+    return raw_data_len;
+}
+
+void zmq::pgm_socket_t::process_upstream ()
+{
+    pgm_msgv_t dummy_msg;
+
+    size_t dummy_bytes = 0;
+    GError *pgm_error = NULL;
+
+    PGMIOStatus status = pgm_recvmsgv (transport, &dummy_msg,
+        1, MSG_DONTWAIT, &dummy_bytes, &pgm_error);
+
+    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));
+}
+
+#endif
+
diff --git a/src/pgm_socket.hpp b/src/pgm_socket.hpp
new file mode 100644
index 0000000..b9f55d1
--- /dev/null
+++ b/src/pgm_socket.hpp
@@ -0,0 +1,105 @@
+/*
+    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 __PGM_SOCKET_HPP_INCLUDED__
+#define __PGM_SOCKET_HPP_INCLUDED__
+
+#include "platform.hpp"
+
+#if defined ZMQ_HAVE_OPENPGM
+
+#ifdef ZMQ_HAVE_WINDOWS
+#include "windows.hpp"
+#endif
+
+#include <pgm/pgm.h>
+
+#include "options.hpp"
+
+namespace zmq
+{
+    //  Encapsulates PGM socket.
+    class pgm_socket_t
+    {
+
+    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.
+        ~pgm_socket_t ();
+
+        //  Initialize PGM network structures (GSI, GSRs).
+        int init (bool udp_encapsulation_, const char *network_);
+        
+        //   Get receiver fds and store them into user allocated memory.
+        void get_receiver_fds (int *receive_fd_, int *waiting_pipe_fd_);
+
+        //   Get sender and receiver fds and store it to user allocated 
+        //   memory. Receive fd is used to process NAKs from peers.
+        void get_sender_fds (int *send_fd_, int *receive_fd_,
+            int *rdata_notify_fd_, int *pending_notify_fd_);
+
+        //  Send data as one APDU, transmit window owned memory.
+        size_t send (unsigned char *data_, size_t data_len_);
+
+        //  Returns max tsdu size without fragmentation.
+        size_t get_max_tsdu_size ();
+
+        //  Receive data from pgm socket.
+        ssize_t receive (void **data_, const pgm_tsi_t **tsi_);
+
+        //  POLLIN on sender side should mean NAK or SPMR receiving. 
+        //  process_upstream function is used to handle such a situation.
+        void process_upstream ();
+
+    private:
+    
+        //  OpenPGM transport
+        pgm_transport_t* transport;
+
+        //  Associated socket options.
+        options_t options;
+       
+        //  true when pgm_socket should create receiving side.
+        bool receiver;
+
+        //  Array of pgm_msgv_t structures to store received data
+        //  from the socket (pgm_transport_recvmsgv).
+        pgm_msgv_t *pgm_msgv;
+
+        //  Size of pgm_msgv array.
+        size_t pgm_msgv_len;
+
+        // How many bytes were read from pgm socket.
+        size_t nbytes_rec;
+
+        //  How many bytes were processed from last pgm socket read.
+        size_t nbytes_processed;
+        
+        //  How many messages from pgm_msgv were already sent up.
+        size_t pgm_msgv_processed;
+    };
+}
+#endif
+
+#endif
+
diff --git a/src/pipe.cpp b/src/pipe.cpp
new file mode 100644
index 0000000..1df64e9
--- /dev/null
+++ b/src/pipe.cpp
@@ -0,0 +1,281 @@
+/*
+    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 "pipe.hpp"
+
+zmq::reader_t::reader_t (object_t *parent_,
+      uint64_t hwm_, uint64_t lwm_) :
+    object_t (parent_),
+    pipe (NULL),
+    peer (NULL),
+    hwm (hwm_),
+    lwm (lwm_),
+    msgs_read (0),
+    endpoint (NULL)
+{
+    //  Adjust lwm and hwm.
+    if (lwm == 0 || lwm > hwm)
+        lwm = hwm;
+}
+
+zmq::reader_t::~reader_t ()
+{
+    if (pipe)
+        unregister_pipe (pipe);
+}
+
+void zmq::reader_t::set_pipe (pipe_t *pipe_)
+{
+    zmq_assert (!pipe);
+    pipe = pipe_;
+    peer = &pipe->writer;
+    register_pipe (pipe);
+}
+
+bool zmq::reader_t::check_read ()
+{
+    //  Check if there's an item in the pipe.
+    if (pipe->check_read ())
+        return true;
+
+    //  If not, deactivate the pipe.
+    endpoint->kill (this);
+    return false;
+}
+
+bool zmq::reader_t::read (zmq_msg_t *msg_)
+{
+    if (!pipe->read (msg_)) {
+        endpoint->kill (this);
+        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 ();
+        return false;
+    }
+
+    if (!(msg_->flags & ZMQ_MSG_MORE))
+        msgs_read++;
+
+    if (lwm > 0 && msgs_read % lwm == 0)
+        send_reader_info (peer, msgs_read);
+
+    return true;
+}
+
+void zmq::reader_t::set_endpoint (i_endpoint *endpoint_)
+{
+    endpoint = endpoint_;
+}
+
+void zmq::reader_t::term ()
+{
+    endpoint = NULL;
+    send_pipe_term (peer);
+}
+
+void zmq::reader_t::process_revive ()
+{
+    //  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);
+}
+
+void zmq::reader_t::process_pipe_term_ack ()
+{
+    peer = NULL;
+    delete pipe;
+}
+
+zmq::writer_t::writer_t (object_t *parent_,
+      uint64_t hwm_, uint64_t lwm_) :
+    object_t (parent_),
+    pipe (NULL),
+    peer (NULL),
+    hwm (hwm_),
+    lwm (lwm_),
+    msgs_read (0),
+    msgs_written (0),
+    stalled (false),
+    endpoint (NULL)
+{
+    //  Adjust lwm and hwm.
+    if (lwm == 0 || lwm > hwm)
+        lwm = hwm;
+}
+
+void zmq::writer_t::set_endpoint (i_endpoint *endpoint_)
+{
+    endpoint = endpoint_;
+}
+
+zmq::writer_t::~writer_t ()
+{
+}
+
+void zmq::writer_t::set_pipe (pipe_t *pipe_)
+{
+    zmq_assert (!pipe);
+    pipe = pipe_;
+    peer = &pipe->reader;
+}
+
+bool zmq::writer_t::check_write ()
+{
+    if (pipe_full ()) {
+        stalled = true;
+        return false;
+    }
+
+    return true;
+}
+
+bool zmq::writer_t::write (zmq_msg_t *msg_)
+{
+    if (pipe_full ()) {
+        stalled = true;
+        return false;
+    }
+
+    pipe->write (*msg_, msg_->flags & ZMQ_MSG_MORE);
+    if (!(msg_->flags & ZMQ_MSG_MORE))
+        msgs_written++;
+    return true;
+}
+
+void zmq::writer_t::rollback ()
+{
+    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);
+        msgs_written--;
+    }
+
+    if (stalled && endpoint != NULL && !pipe_full()) {
+        stalled = false;
+        endpoint->revive (this);
+    }
+}
+
+void zmq::writer_t::flush ()
+{
+    if (!pipe->flush ())
+        send_revive (peer);
+}
+
+void zmq::writer_t::term ()
+{
+    endpoint = NULL;
+
+    //  Rollback any unfinished messages.
+    rollback ();
+
+    //  Push delimiter into the pipe.
+    //  Trick the compiler to belive that the tag is a valid pointer.
+    zmq_msg_t msg;
+    const unsigned char *offset = 0;
+    msg.content = (void*) (offset + ZMQ_DELIMITER);
+    msg.flags = 0;
+    pipe->write (msg, false);
+    pipe->flush ();
+}
+
+void zmq::writer_t::process_reader_info (uint64_t msgs_read_)
+{
+    msgs_read = msgs_read_;
+    if (stalled && endpoint != NULL) {
+        stalled = false;
+        endpoint->revive (this);
+    }
+}
+
+void zmq::writer_t::process_pipe_term ()
+{
+    if (endpoint)
+        endpoint->detach_outpipe (this);
+
+    reader_t *p = peer;
+    peer = NULL;
+    send_pipe_term_ack (p);
+}
+
+bool zmq::writer_t::pipe_full ()
+{
+    return hwm > 0 && msgs_written - msgs_read == hwm;
+}
+
+zmq::pipe_t::pipe_t (object_t *reader_parent_, object_t *writer_parent_,
+      uint64_t hwm_) :
+    reader (reader_parent_, hwm_, compute_lwm (hwm_)),
+    writer (writer_parent_, hwm_, compute_lwm (hwm_))
+{
+    reader.set_pipe (this);
+    writer.set_pipe (this);
+}
+
+zmq::pipe_t::~pipe_t ()
+{
+    //  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);
+}
+
+uint64_t zmq::pipe_t::compute_lwm (uint64_t hwm_)
+{
+   //  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_ / 2;
+}
+
diff --git a/src/pipe.hpp b/src/pipe.hpp
new file mode 100644
index 0000000..9f57653
--- /dev/null
+++ b/src/pipe.hpp
@@ -0,0 +1,169 @@
+/*
+    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_PIPE_HPP_INCLUDED__
+#define __ZMQ_PIPE_HPP_INCLUDED__
+
+#include "../include/zmq.h"
+
+#include "stdint.hpp"
+#include "i_endpoint.hpp"
+#include "yarray_item.hpp"
+#include "ypipe.hpp"
+#include "config.hpp"
+#include "object.hpp"
+
+namespace zmq
+{
+
+    class reader_t : public object_t, public yarray_item_t
+    {
+    public:
+
+        reader_t (class object_t *parent_,
+            uint64_t hwm_, uint64_t lwm_);
+        ~reader_t ();
+
+        void set_pipe (class pipe_t *pipe_);
+        void set_endpoint (i_endpoint *endpoint_);
+
+        //  Returns true if there is at least one message to read in the pipe.
+        bool check_read ();
+
+        //  Reads a message to the underlying pipe.
+        bool read (zmq_msg_t *msg_);
+
+        //  Ask pipe to terminate.
+        void term ();
+
+    private:
+
+        //  Command handlers.
+        void process_revive ();
+        void process_pipe_term_ack ();
+
+        //  The underlying pipe.
+        class pipe_t *pipe;
+
+        //  Pipe writer associated with the other side of the pipe.
+        class writer_t *peer;
+
+        //  High and low watermarks for in-memory storage (in bytes).
+        uint64_t hwm;
+        uint64_t lwm;
+
+        //  Number of messages read so far.
+        uint64_t msgs_read;
+
+        //  Endpoint (either session or socket) the pipe is attached to.
+        i_endpoint *endpoint;
+
+        reader_t (const reader_t&);
+        void operator = (const reader_t&);
+    };
+
+    class writer_t : public object_t, public yarray_item_t
+    {
+    public:
+
+        writer_t (class object_t *parent_,
+            uint64_t hwm_, uint64_t lwm_);
+        ~writer_t ();
+
+        void set_pipe (class pipe_t *pipe_);
+        void set_endpoint (i_endpoint *endpoint_);
+
+        //  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 ();
+
+        //  Writes a message to the underlying pipe. Returns false if the
+        //  message cannot be written because high watermark was reached.
+        bool write (zmq_msg_t *msg_);
+
+        //  Remove unfinished part of a message from the pipe.
+        void rollback ();
+
+        //  Flush the messages downsteam.
+        void flush ();
+
+        //  Ask pipe to terminate.
+        void term ();
+
+    private:
+
+        void process_reader_info (uint64_t msgs_read_);
+
+        //  Command handlers.
+        void process_pipe_term ();
+
+        //  Tests whether the pipe is already full.
+        bool pipe_full ();
+
+        //  The underlying pipe.
+        class pipe_t *pipe;
+
+        //  Pipe reader associated with the other side of the pipe.
+        class reader_t *peer;
+
+        //  High and low watermarks for in-memory storage (in bytes).
+        uint64_t hwm;
+        uint64_t lwm;
+
+        //  Last confirmed number of messages read from the pipe.
+        //  The actual number can be higher.
+        uint64_t msgs_read;
+
+        //  Number of messages we have written so far.
+        uint64_t msgs_written;
+
+        //  True iff the last attempt to write a message has failed.
+        bool stalled;
+
+        //  Endpoint (either session or socket) the pipe is attached to.
+        i_endpoint *endpoint;
+
+        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_);
+        ~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&);
+    };
+
+}
+
+#endif
diff --git a/src/platform.hpp.in b/src/platform.hpp.in
new file mode 100644
index 0000000..a885c21
--- /dev/null
+++ b/src/platform.hpp.in
@@ -0,0 +1,228 @@
+/* src/platform.hpp.in.  Generated from configure.in by autoheader.  */
+
+/* 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 <errno.h> header file. */
+#undef HAVE_ERRNO_H
+
+/* Define to 1 if you have the `freeifaddrs' function. */
+#undef HAVE_FREEIFADDRS
+
+/* Define to 1 if you have the `getifaddrs' function. */
+#undef HAVE_GETIFADDRS
+
+/* Define to 1 if you have the `gettimeofday' function. */
+#undef HAVE_GETTIMEOFDAY
+
+/* Define to 1 if you have the <ifaddrs.h> header file. */
+#undef HAVE_IFADDRS_H
+
+/* Define to 1 if you have the <inttypes.h> header file. */
+#undef HAVE_INTTYPES_H
+
+/* Define to 1 if you have the `iphlpapi' library (-liphlpapi). */
+#undef HAVE_LIBIPHLPAPI
+
+/* Define to 1 if you have the `nsl' library (-lnsl). */
+#undef HAVE_LIBNSL
+
+/* Define to 1 if you have the `pthread' library (-lpthread). */
+#undef HAVE_LIBPTHREAD
+
+/* Define to 1 if you have the `rpcrt4' library (-lrpcrt4). */
+#undef HAVE_LIBRPCRT4
+
+/* Define to 1 if you have the `rt' library (-lrt). */
+#undef HAVE_LIBRT
+
+/* Define to 1 if you have the `socket' library (-lsocket). */
+#undef HAVE_LIBSOCKET
+
+/* Define to 1 if you have the `uuid' library (-luuid). */
+#undef HAVE_LIBUUID
+
+/* Define to 1 if you have the `ws2_32' library (-lws2_32). */
+#undef HAVE_LIBWS2_32
+
+/* Define to 1 if you have the <limits.h> header file. */
+#undef HAVE_LIMITS_H
+
+/* Define to 1 if you have the <memory.h> header file. */
+#undef HAVE_MEMORY_H
+
+/* Define to 1 if you have the `memset' function. */
+#undef HAVE_MEMSET
+
+/* Define to 1 if you have the <netinet/in.h> header file. */
+#undef HAVE_NETINET_IN_H
+
+/* Define to 1 if you have the <netinet/tcp.h> header file. */
+#undef HAVE_NETINET_TCP_H
+
+/* Define to 1 if you have the `perror' function. */
+#undef HAVE_PERROR
+
+/* Define to 1 if you have the `socket' function. */
+#undef HAVE_SOCKET
+
+/* Define to 1 if stdbool.h conforms to C99. */
+#undef HAVE_STDBOOL_H
+
+/* Define to 1 if you have the <stddef.h> header file. */
+#undef HAVE_STDDEF_H
+
+/* Define to 1 if you have the <stdint.h> header file. */
+#undef HAVE_STDINT_H
+
+/* Define to 1 if you have the <stdlib.h> header file. */
+#undef HAVE_STDLIB_H
+
+/* Define to 1 if you have the <strings.h> header file. */
+#undef HAVE_STRINGS_H
+
+/* Define to 1 if you have the <string.h> header file. */
+#undef HAVE_STRING_H
+
+/* Define to 1 if you have the <sys/socket.h> header file. */
+#undef HAVE_SYS_SOCKET_H
+
+/* Define to 1 if you have the <sys/stat.h> header file. */
+#undef HAVE_SYS_STAT_H
+
+/* Define to 1 if you have the <sys/time.h> header file. */
+#undef HAVE_SYS_TIME_H
+
+/* Define to 1 if you have the <sys/types.h> header file. */
+#undef HAVE_SYS_TYPES_H
+
+/* Define to 1 if you have the <unistd.h> header file. */
+#undef HAVE_UNISTD_H
+
+/* Define to 1 if you have the <windows.h> header file. */
+#undef HAVE_WINDOWS_H
+
+/* Define to 1 if the system has the type `_Bool'. */
+#undef HAVE__BOOL
+
+/* Define to the sub-directory in which libtool stores uninstalled libraries.
+   */
+#undef LT_OBJDIR
+
+/* Define to 1 if your C compiler doesn't accept -c and -o together. */
+#undef NO_MINUS_C_MINUS_O
+
+/* Name of package */
+#undef PACKAGE
+
+/* Define to the address where bug reports for this package should be sent. */
+#undef PACKAGE_BUGREPORT
+
+/* Define to the full name of this package. */
+#undef PACKAGE_NAME
+
+/* Define to the full name and version of this package. */
+#undef PACKAGE_STRING
+
+/* Define to the one symbol short name of this package. */
+#undef PACKAGE_TARNAME
+
+/* Define to the version of this package. */
+#undef PACKAGE_VERSION
+
+/* 0MQ major version */
+#undef PACKAGE_VERSION_MAJOR
+
+/* 0MQ minor version */
+#undef PACKAGE_VERSION_MINOR
+
+/* 0MQ patchlevel */
+#undef PACKAGE_VERSION_PATCH
+
+/* Define as the return type of signal handlers (`int' or `void'). */
+#undef RETSIGTYPE
+
+/* Define to 1 if you have the ANSI C header files. */
+#undef STDC_HEADERS
+
+/* Define to 1 if you can safely include both <sys/time.h> and <time.h>. */
+#undef TIME_WITH_SYS_TIME
+
+/* Version number of package */
+#undef VERSION
+
+/* Force to use mutexes */
+#undef ZMQ_FORCE_MUTEXES
+
+/* Have AIX OS */
+#undef ZMQ_HAVE_AIX
+
+/* Have Cygwin */
+#undef ZMQ_HAVE_CYGWIN
+
+/* Have FreeBSD OS */
+#undef ZMQ_HAVE_FREEBSD
+
+/* Have HPUX OS */
+#undef ZMQ_HAVE_HPUX
+
+/* Have ifaddrs.h header. */
+#undef ZMQ_HAVE_IFADDRS
+
+/* Have Linux OS */
+#undef ZMQ_HAVE_LINUX
+
+/* Have MinGW32 */
+#undef ZMQ_HAVE_MINGW32
+
+/* Have NetBSD OS */
+#undef ZMQ_HAVE_NETBSD
+
+/* Have OpenBSD OS */
+#undef ZMQ_HAVE_OPENBSD
+
+/* Have OpenPGM extension */
+#undef ZMQ_HAVE_OPENPGM
+
+/* Have DarwinOSX OS */
+#undef ZMQ_HAVE_OSX
+
+/* Have QNX Neutrino OS */
+#undef ZMQ_HAVE_QNXNTO
+
+/* Have Solaris OS */
+#undef ZMQ_HAVE_SOLARIS
+
+/* Have Windows OS */
+#undef ZMQ_HAVE_WINDOWS
+
+/* Define for Solaris 2.5.1 so the uint32_t typedef from <sys/synch.h>,
+   <pthread.h>, or <semaphore.h> is not used. If the typedef was allowed, the
+   #define below would cause a syntax error. */
+#undef _UINT32_T
+
+/* Define to empty if `const' does not conform to ANSI C. */
+#undef const
+
+/* Define to `__inline__' or `__inline' if that's what the C compiler
+   calls it, or to nothing if 'inline' is not supported under any name.  */
+#ifndef __cplusplus
+#undef inline
+#endif
+
+/* Define to `unsigned int' if <sys/types.h> does not define. */
+#undef size_t
+
+/* Define to `int' if <sys/types.h> does not define. */
+#undef ssize_t
+
+/* Define to the type of an unsigned integer type of width exactly 32 bits if
+   such a type exists and the standard includes do not define it. */
+#undef uint32_t
+
+/* Define to empty if the keyword `volatile' does not work. Warning: valid
+   code using `volatile' can become incorrect without. Disable with care. */
+#undef volatile
diff --git a/src/poll.cpp b/src/poll.cpp
new file mode 100644
index 0000000..4214195
--- /dev/null
+++ b/src/poll.cpp
@@ -0,0 +1,207 @@
+/*
+    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 "platform.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 <sys/types.h>
+#include <sys/time.h>
+#include <sys/resource.h>
+#include <poll.h>
+#include <algorithm>
+
+#include "poll.hpp"
+#include "err.hpp"
+#include "config.hpp"
+#include "i_poll_events.hpp"
+
+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_)
+{
+    pollfd pfd = {fd_, 0, 0};
+    pollset.push_back (pfd);
+    assert (fd_table [fd_].index == retired_fd);
+
+    fd_table [fd_].index = pollset.size() - 1;
+    fd_table [fd_].events = events_;
+
+    //  Increase the load metric of the thread.
+    load.add (1);
+
+    return fd_;
+}
+
+void zmq::poll_t::rm_fd (handle_t handle_)
+{
+    fd_t index = fd_table [handle_].index;
+    assert (index != retired_fd);
+
+    //  Mark the fd as unused.
+    pollset [index].fd = retired_fd;
+    fd_table [handle_].index = retired_fd;
+    retired = true;
+
+    //  Decrease the load metric of the thread.
+    load.sub (1);
+}
+
+void zmq::poll_t::set_pollin (handle_t handle_)
+{
+    int index = fd_table [handle_].index;
+    pollset [index].events |= POLLIN;
+}
+
+void zmq::poll_t::reset_pollin (handle_t handle_)
+{
+    int index = fd_table [handle_].index;
+    pollset [index].events &= ~((short) POLLIN);
+}
+
+void zmq::poll_t::set_pollout (handle_t handle_)
+{
+    int index = fd_table [handle_].index;
+    pollset [index].events |= POLLOUT;
+}
+
+void zmq::poll_t::reset_pollout (handle_t handle_)
+{
+    int index = fd_table [handle_].index;
+    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);
+}
+
+void zmq::poll_t::stop ()
+{
+    stopping = true;
+}
+
+void zmq::poll_t::loop ()
+{
+    while (!stopping) {
+
+        //  Wait for events.
+        int rc = poll (&pollset [0], pollset.size (),
+            timers.empty () ? -1 : max_timer_period);
+        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 ();
+
+            continue;
+        }
+
+        for (pollset_t::iterator it = pollset.begin ();
+                it != pollset.end (); it ++) {
+
+            zmq_assert (!(it->revents & POLLNVAL));
+            if (it->fd == retired_fd)
+               continue;
+            if (it->revents & (POLLERR | POLLHUP))
+                fd_table [it->fd].events->in_event ();
+            if (it->fd == retired_fd)
+               continue;
+            if (it->revents & POLLOUT)
+                fd_table [it->fd].events->out_event ();
+            if (it->fd == retired_fd)
+               continue;
+            if (it->revents & POLLIN)
+                fd_table [it->fd].events->in_event ();
+        }
+
+        //  Clean up the pollset and update the fd_table accordingly.
+        if (retired) {
+            pollset_t::size_type i = 0;
+            while (i < pollset.size ()) {
+                if (pollset [i].fd == retired_fd)
+                    pollset.erase (pollset.begin () + i);
+                else {
+                    fd_table [pollset [i].fd].index = i;
+                    i ++;
+                }
+            }
+            retired = false;
+        }
+    }
+}
+
+void zmq::poll_t::worker_routine (void *arg_)
+{
+    ((poll_t*) arg_)->loop ();
+}
+
+#endif
diff --git a/src/poll.hpp b/src/poll.hpp
new file mode 100644
index 0000000..f4ae35a
--- /dev/null
+++ b/src/poll.hpp
@@ -0,0 +1,113 @@
+/*
+    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_POLL_HPP_INCLUDED__
+#define __ZMQ_POLL_HPP_INCLUDED__
+
+#include "platform.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>
+#include <stddef.h>
+#include <vector>
+
+#include "fd.hpp"
+#include "thread.hpp"
+#include "atomic_counter.hpp"
+
+namespace zmq
+{
+
+    //  Implements socket polling mechanism using the POSIX.1-2001
+    //  poll() system call.
+
+    class poll_t
+    {
+    public:
+
+        typedef fd_t handle_t;
+
+        poll_t ();
+        ~poll_t ();
+
+        //  "poller" concept.
+        handle_t add_fd (fd_t fd_, struct i_poll_events *events_);
+        void rm_fd (handle_t handle_);
+        void set_pollin (handle_t handle_);
+        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 ();
+
+    private:
+
+        //  Main worker thread routine.
+        static void worker_routine (void *arg_);
+
+        //  Main event loop.
+        void loop ();
+
+        struct fd_entry_t
+        {
+            fd_t index;
+            struct i_poll_events *events;
+        };
+
+        //  This table stores data for registered descriptors.
+        std::vector <fd_entry_t> fd_table;
+
+        //  Pollset to pass to the poll function.
+        typedef std::vector <pollfd> pollset_t;
+        pollset_t pollset;
+
+        //  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&);
+    };
+
+}
+
+#endif
+
+#endif
diff --git a/src/poller.hpp b/src/poller.hpp
new file mode 100644
index 0000000..3c29603
--- /dev/null
+++ b/src/poller.hpp
@@ -0,0 +1,72 @@
+/*
+    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_POLLER_HPP_INCLUDED__
+#define __ZMQ_POLLER_HPP_INCLUDED__
+
+#include "epoll.hpp"
+#include "poll.hpp"
+#include "select.hpp"
+#include "devpoll.hpp"
+#include "kqueue.hpp"
+
+namespace zmq
+{
+
+#if defined ZMQ_FORCE_SELECT
+    typedef select_t poller_t;
+#elif defined ZMQ_FORCE_POLL
+    typedef poll_t poller_t;
+#elif defined ZMQ_FORCE_EPOLL
+    typedef epoll_t poller_t;
+#elif defined ZMQ_FORCE_DEVPOLL
+    typedef devpoll_t poller_t;
+#elif defined ZMQ_FORCE_KQUEUE
+    typedef kqueue_t poller_t;
+#elif defined ZMQ_HAVE_LINUX
+    typedef epoll_t poller_t;
+#elif defined ZMQ_HAVE_WINDOWS
+    typedef select_t poller_t;
+#elif defined ZMQ_HAVE_FREEBSD
+    typedef kqueue_t poller_t;
+#elif defined ZMQ_HAVE_OPENBSD
+    typedef kqueue_t poller_t;
+#elif defined ZMQ_HAVE_NETBSD
+    typedef kqueue_t poller_t;
+#elif defined ZMQ_HAVE_SOLARIS
+    typedef devpoll_t poller_t;
+#elif defined ZMQ_HAVE_OSX
+    typedef kqueue_t poller_t;
+#elif defined ZMQ_HAVE_QNXNTO
+    typedef poll_t poller_t;
+#elif defined ZMQ_HAVE_AIX
+    typedef poll_t poller_t;
+#elif defined ZMQ_HAVE_HPUX
+    typedef devpoll_t poller_t;
+#elif defined ZMQ_HAVE_OPENVMS
+    typedef select_t poller_t;
+#elif defined ZMQ_HAVE_CYGWIN
+    typedef select_t poller_t;
+#else
+#error Unsupported platform
+#endif
+
+}
+
+#endif
diff --git a/src/prefix_tree.cpp b/src/prefix_tree.cpp
new file mode 100644
index 0000000..51225d6
--- /dev/null
+++ b/src/prefix_tree.cpp
@@ -0,0 +1,180 @@
+/*
+    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 <stdlib.h>
+
+#include <new>
+#include <algorithm>
+
+#include "platform.hpp"
+#if defined ZMQ_HAVE_WINDOWS
+#include "windows.hpp"
+#endif
+
+#include "err.hpp"
+#include "prefix_tree.hpp"
+
+zmq::prefix_tree_t::prefix_tree_t () :
+    refcnt (0),
+    min (0),
+    count (0)
+{
+}
+
+zmq::prefix_tree_t::~prefix_tree_t ()
+{
+    if (count == 1)
+        delete next.node;
+    else if (count > 1) {
+        for (unsigned char i = 0; i != count; ++i)
+            if (next.table [i])
+                delete next.table [i];
+        free (next.table);
+    }
+}
+
+void zmq::prefix_tree_t::add (unsigned char *prefix_, size_t size_)
+{
+    //  We are at the node corresponding to the prefix. We are done.
+    if (!size_) {
+        ++refcnt;
+        return;
+    }
+
+    unsigned char c = *prefix_;
+    if (c < min || c >= min + count) {
+
+        //  The character is out of range of currently handled
+        //  charcters. We have to extend the table.
+        if (!count) {
+            min = c;
+            count = 1;
+            next.node = NULL;
+        }
+        else if (count == 1) {
+            unsigned char oldc = min;
+            prefix_tree_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);
+            for (unsigned char i = 0; i != count; ++i)
+                next.table [i] = 0;
+            min = std::min (min, c);
+            next.table [oldc - min] = oldp;
+        }
+        else if (min < c) {
+
+            //  The new character is above the current character range.
+            unsigned char old_count = count;
+            count = c - min + 1;
+            next.table = (prefix_tree_t**) realloc ((void*) next.table,
+                sizeof (prefix_tree_t*) * count);
+            zmq_assert (next.table);
+            for (unsigned char i = old_count; i != count; i++)
+                next.table [i] = NULL;
+        }
+        else {
+
+            //  The new character is below the current character range.
+            unsigned char old_count = count;
+            count = (min + old_count) - c;
+            next.table = (prefix_tree_t**) realloc ((void*) next.table,
+                sizeof (prefix_tree_t*) * count);
+            zmq_assert (next.table);
+            memmove (next.table + min - c, next.table,
+                old_count * sizeof (prefix_tree_t*));
+            for (unsigned char i = 0; i != min - c; i++)
+                next.table [i] = NULL;
+            min = c;
+        }
+    }
+
+    //  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->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]->add (prefix_ + 1, size_ - 1);
+    }
+}
+
+bool zmq::prefix_tree_t::rm (unsigned char *prefix_, size_t size_)
+{
+     if (!size_) {
+         if (!refcnt)
+             return false;
+         refcnt--;
+         return true;
+     }
+
+     unsigned char c = *prefix_;
+     if (!count || c < min || c >= min + count)
+         return false;
+
+     prefix_tree_t *next_node =
+         count == 1 ? next.node : next.table [c - min];
+
+     if (!next_node)
+         return false;
+
+     return next_node->rm (prefix_ + 1, size_ - 1);
+}
+
+bool zmq::prefix_tree_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;
+    while (true) {
+
+        //  We've found a corresponding subscription!
+        if (current->refcnt)
+            return true;
+
+        //  We've checked all the data and haven't found matching subscription.
+        if (!size_)
+            return false;
+
+        //  If there's no corresponding slot for the first character
+        //  of the prefix, the message does not match.
+        unsigned char c = *data_;
+        if (c < current->min || c >= current->min + current->count)
+            return false;
+
+        //  Move to the next character.
+        if (current->count == 1)
+            current = current->next.node;
+        else {
+            current = current->next.table [c - current->min];
+            if (!current)
+                return false;
+        }
+        data_++;
+        size_--;
+    }
+}
diff --git a/src/prefix_tree.hpp b/src/prefix_tree.hpp
new file mode 100644
index 0000000..53c7c18
--- /dev/null
+++ b/src/prefix_tree.hpp
@@ -0,0 +1,55 @@
+/*
+    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_PREFIX_TREE_HPP_INCLUDED__
+#define __ZMQ_PREFIX_TREE_HPP_INCLUDED__
+
+#include <stddef.h>
+
+#include "stdint.hpp"
+
+namespace zmq
+{
+
+    class prefix_tree_t
+    {
+    public:
+
+        prefix_tree_t ();
+        ~prefix_tree_t ();
+
+        void add (unsigned char *prefix_, size_t size_);
+        bool rm (unsigned char *prefix_, size_t size_);
+        bool check (unsigned char *data_, size_t size_);
+
+    private:
+
+        uint32_t refcnt;
+        unsigned char min;
+        unsigned char count;
+        union {
+            class prefix_tree_t *node;
+            class prefix_tree_t **table;
+        } next;
+    };
+
+}
+
+#endif
+
diff --git a/src/pub.cpp b/src/pub.cpp
new file mode 100644
index 0000000..4e73b19
--- /dev/null
+++ b/src/pub.cpp
@@ -0,0 +1,177 @@
+/*
+    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 "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)
+{
+    options.requires_in = false;
+    options.requires_out = true;
+}
+
+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
new file mode 100644
index 0000000..ac3924a
--- /dev/null
+++ b/src/pub.hpp
@@ -0,0 +1,70 @@
+/*
+    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_PUB_HPP_INCLUDED__
+#define __ZMQ_PUB_HPP_INCLUDED__
+
+#include "socket_base.hpp"
+#include "yarray.hpp"
+
+namespace zmq
+{
+
+    class pub_t : public socket_base_t
+    {
+    public:
+
+        pub_t (class app_thread_t *parent_);
+        ~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&);
+    };
+
+}
+
+#endif
diff --git a/src/queue.cpp b/src/queue.cpp
new file mode 100644
index 0000000..470ea67
--- /dev/null
+++ b/src/queue.cpp
@@ -0,0 +1,101 @@
+/*
+    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 <stddef.h>
+
+#include "../include/zmq.h"
+
+#include "queue.hpp"
+#include "socket_base.hpp"
+#include "err.hpp"
+
+int zmq::queue (class socket_base_t *insocket_,
+        class socket_base_t *outsocket_)
+{
+    zmq_msg_t msg;
+    int rc = zmq_msg_init (&msg);
+    zmq_assert (rc == 0);
+
+    int64_t more;
+    size_t moresz;
+
+    zmq_pollitem_t items [2];
+    items [0].socket = insocket_;
+    items [0].fd = 0;
+    items [0].events = ZMQ_POLLIN;
+    items [0].revents = 0;
+    items [1].socket = outsocket_;
+    items [1].fd = 0;
+    items [1].events = ZMQ_POLLIN;
+    items [1].revents = 0;
+
+    while (true) {
+
+        //  Wait while there are either requests or replies to process.
+        rc = zmq_poll (&items [0], 2, -1);
+        errno_assert (rc > 0);
+
+        //  The algorithm below asumes ratio of request and replies processed
+        //  under full load to be 1:1. Although processing requests replies
+        //  first is tempting it is suspectible to DoS attacks (overloading
+        //  the system with unsolicited replies).
+
+        //  Process a request.
+        if (items [0].revents & ZMQ_POLLIN) {
+            while (true) {
+
+                rc = insocket_->recv (&msg, 0);
+                errno_assert (rc == 0);
+
+                moresz = sizeof (more);
+                rc = insocket_->getsockopt (ZMQ_RCVMORE, &more, &moresz);
+                errno_assert (rc == 0);
+
+                rc = outsocket_->send (&msg, more ? ZMQ_SNDMORE : 0);
+                errno_assert (rc == 0);
+
+                if (!more)
+                    break;
+            }
+        }
+
+        //  Process a reply.
+        if (items [1].revents & ZMQ_POLLIN) {
+            while (true) {
+
+                rc = outsocket_->recv (&msg, 0);
+                errno_assert (rc == 0);
+
+                moresz = sizeof (more);
+                rc = outsocket_->getsockopt (ZMQ_RCVMORE, &more, &moresz);
+                errno_assert (rc == 0);
+
+                rc = insocket_->send (&msg, more ? ZMQ_SNDMORE : 0);
+                errno_assert (rc == 0);
+
+                if (!more)
+                    break;
+            }
+        }
+
+    }
+
+    return 0;
+}
+
diff --git a/src/queue.hpp b/src/queue.hpp
new file mode 100644
index 0000000..dc968cb
--- /dev/null
+++ b/src/queue.hpp
@@ -0,0 +1,31 @@
+/*
+    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/rep.cpp b/src/rep.cpp
new file mode 100644
index 0000000..34b77c4
--- /dev/null
+++ b/src/rep.cpp
@@ -0,0 +1,280 @@
+/*
+    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 "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),
+    sending_reply (false),
+    more (false),
+    reply_pipe (NULL)
+{
+    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;
+}
+
+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 (!sending_reply) {
+        errno = EFSM;
+        return -1;
+    }
+
+    if (reply_pipe) {
+
+        // Push message to the reply pipe.
+        bool written = reply_pipe->write (msg_);
+        zmq_assert (!more || written);
+
+        // 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 ();
+        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;
+}
+
+int zmq::rep_t::xrecv (zmq_msg_t *msg_, int flags_)
+{
+    //  If we are in middle of sending a reply, we cannot receive next request.
+    if (sending_reply) {
+        errno = EFSM;
+        return -1;
+    }
+
+    //  Deallocate old content of the message.
+    zmq_msg_close (msg_);
+
+    //  We haven't started reading a request yet...
+    if (!more) {
+
+        //  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;
+        }
+
+        //  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;
+        }
+
+        //  We are aware of a new message now. Setup the reply pipe.
+        reply_pipe = out_pipes [current];
+
+        //  Copy the routing info to the reply pipe.
+        while (true) {
+
+            //  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);
+        }
+    }
+
+    //  Now the routing info is processed. 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;
+        sending_reply = true;
+    }
+    return 0;
+}
+
+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;
+}
+
+bool zmq::rep_t::xhas_out ()
+{
+    if (!sending_reply)
+        return false;
+
+    if (more)
+        return true;
+
+    //  TODO: No check for write here...
+    return sending_reply;
+}
+
diff --git a/src/rep.hpp b/src/rep.hpp
new file mode 100644
index 0000000..aef4318
--- /dev/null
+++ b/src/rep.hpp
@@ -0,0 +1,85 @@
+/*
+    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_REP_HPP_INCLUDED__
+#define __ZMQ_REP_HPP_INCLUDED__
+
+#include "socket_base.hpp"
+#include "yarray.hpp"
+
+namespace zmq
+{
+
+    class rep_t : public socket_base_t
+    {
+    public:
+
+        rep_t (class app_thread_t *parent_);
+        ~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 ();
+        bool xhas_out ();
+
+    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.
+        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;
+
+        rep_t (const rep_t&);
+        void operator = (const rep_t&);
+
+    };
+
+}
+
+#endif
diff --git a/src/req.cpp b/src/req.cpp
new file mode 100644
index 0000000..f3695a2
--- /dev/null
+++ b/src/req.cpp
@@ -0,0 +1,286 @@
+/*
+    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 "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),
+    receiving_reply (false),
+    reply_pipe_active (false),
+    more (false),
+    reply_pipe (NULL)
+{
+    options.requires_in = true;
+    options.requires_out = true;
+}
+
+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_)
+{
+    //  TODO: Actually, misbehaving peer can cause this kind of thing.
+    //  Handle it decently, presumably kill the offending connection.
+    zmq_assert (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,
+    //  we can't send another request.
+    if (receiving_reply) {
+        errno = EFSM;
+        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) {
+        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);
+    }
+
+    //  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];
+
+        //  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;
+
+        //  Move to the next pipe (load-balancing).
+        current = (current + 1) % active;
+    }
+
+    //  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) {
+        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);
+    }
+
+    //  If this was last part of the reply, switch to request phase.
+    more = msg_->flags & ZMQ_MSG_MORE;
+    if (!more) {
+        receiving_reply = false;
+        reply_pipe = NULL;
+    }
+
+    return 0;
+}
+
+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;
+        return false;
+    }
+
+    return true;
+}
+
+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;
+}
+
+
diff --git a/src/req.hpp b/src/req.hpp
new file mode 100644
index 0000000..5ab7bca
--- /dev/null
+++ b/src/req.hpp
@@ -0,0 +1,93 @@
+/*
+    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_REQ_HPP_INCLUDED__
+#define __ZMQ_REQ_HPP_INCLUDED__
+
+#include "socket_base.hpp"
+#include "yarray.hpp"
+
+namespace zmq
+{
+
+    class req_t : public socket_base_t
+    {
+    public:
+
+        req_t (class app_thread_t *parent_);
+        ~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 ();
+        bool xhas_out ();
+
+    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;
+
+        req_t (const req_t&);
+        void operator = (const req_t&);
+    };
+
+}
+
+#endif
diff --git a/src/select.cpp b/src/select.cpp
new file mode 100644
index 0000000..be5cd47
--- /dev/null
+++ b/src/select.cpp
@@ -0,0 +1,234 @@
+/*
+    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 "platform.hpp"
+
+#include <string.h>
+#include <algorithm>
+
+#ifdef ZMQ_HAVE_WINDOWS
+#include "winsock2.h"
+#elif defined ZMQ_HAVE_HPUX
+#include <sys/param.h>
+#include <sys/types.h>
+#include <sys/time.h>
+#elif defined ZMQ_HAVE_OPENVMS
+#include <sys/types.h>
+#include <sys/time.h>
+#else
+#include <sys/select.h>
+#endif
+
+#include "select.hpp"
+#include "err.hpp"
+#include "config.hpp"
+#include "i_poll_events.hpp"
+
+zmq::select_t::select_t () :
+    maxfd (retired_fd),
+    retired (false),
+    stopping (false)
+{
+    //  Clear file descriptor sets.
+    FD_ZERO (&source_set_in);
+    FD_ZERO (&source_set_out);
+    FD_ZERO (&source_set_err);
+}
+
+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_)
+{
+    //  Store the file descriptor.
+    fd_entry_t entry = {fd_, events_};
+    fds.push_back (entry);
+
+    //  Start polling on errors.
+    FD_SET (fd_, &source_set_err);
+
+    //  Adjust maxfd if necessary.
+    if (fd_ > maxfd)
+        maxfd = fd_;
+
+    //  Increase the load metric of the thread.
+    load.add (1);
+
+    return fd_;
+}
+
+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 ++)
+        if (it->fd == handle_)
+            break;
+    zmq_assert (it != fds.end ());
+    it->fd = retired_fd;
+    retired = true;
+
+    //  Stop polling on the descriptor.
+    FD_CLR (handle_, &source_set_in);
+    FD_CLR (handle_, &source_set_out);
+    FD_CLR (handle_, &source_set_err);
+
+    //  Discard all events generated on this file descriptor.
+    FD_CLR (handle_, &readfds);
+    FD_CLR (handle_, &writefds);
+    FD_CLR (handle_, &exceptfds);
+
+    //  Adjust the maxfd attribute if we have removed the
+    //  highest-numbered file descriptor.
+    if (handle_ == maxfd) {
+        maxfd = retired_fd;
+        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);
+}
+
+void zmq::select_t::set_pollin (handle_t handle_)
+{
+    FD_SET (handle_, &source_set_in);
+}
+
+void zmq::select_t::reset_pollin (handle_t handle_)
+{
+    FD_CLR (handle_, &source_set_in);
+}
+
+void zmq::select_t::set_pollout (handle_t handle_)
+{
+    FD_SET (handle_, &source_set_out);
+}
+
+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);
+}
+
+void zmq::select_t::stop ()
+{
+    stopping = true;
+}
+
+void zmq::select_t::loop ()
+{
+    while (!stopping) {
+
+        //  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.
+        int rc = select (maxfd + 1, &readfds, &writefds, &exceptfds,
+            timers.empty () ? NULL : &timeout);
+
+#ifdef ZMQ_HAVE_WINDOWS
+        wsa_assert (rc != SOCKET_ERROR);
+#else
+        if (rc == -1 && errno == EINTR)
+            continue;
+        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 ();
+
+            continue;
+        }
+
+        for (fd_set_t::size_type i = 0; i < fds.size (); i ++) {
+            if (fds [i].fd == retired_fd)
+                continue;
+            if (FD_ISSET (fds [i].fd, &exceptfds))
+                fds [i].events->in_event ();
+            if (fds [i].fd == retired_fd)
+                continue;
+            if (FD_ISSET (fds [i].fd, &writefds))
+                fds [i].events->out_event ();
+            if (fds [i].fd == retired_fd)
+                continue;
+            if (FD_ISSET (fds [i].fd, &readfds))
+                fds [i].events->in_event ();
+        }
+
+        //  Destroy retired event sources.
+        if (retired) {
+            for (fd_set_t::size_type i = 0; i < fds.size (); i ++) {
+                if (fds [i].fd == retired_fd) {
+                    fds.erase (fds.begin () + i);
+                    i --;
+                }
+            }
+            retired = false;
+        }
+    }
+}
+
+void zmq::select_t::worker_routine (void *arg_)
+{
+    ((select_t*) arg_)->loop ();
+}
diff --git a/src/select.hpp b/src/select.hpp
new file mode 100644
index 0000000..01e9fa8
--- /dev/null
+++ b/src/select.hpp
@@ -0,0 +1,123 @@
+/*
+    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_SELECT_HPP_INCLUDED__
+#define __ZMQ_SELECT_HPP_INCLUDED__
+
+#include "platform.hpp"
+
+#include <stddef.h>
+#include <vector>
+
+#ifdef ZMQ_HAVE_WINDOWS
+#include "winsock2.h"
+#elif defined ZMQ_HAVE_OPENVMS
+#include <sys/types.h>
+#include <sys/time.h>
+#else
+#include <sys/select.h>
+#endif
+
+#include "fd.hpp"
+#include "thread.hpp"
+#include "atomic_counter.hpp"
+
+namespace zmq
+{
+
+    //  Implements socket polling mechanism using POSIX.1-2001 select()
+    //  function.
+
+    class select_t
+    {
+    public:
+
+        typedef fd_t handle_t;
+
+        select_t ();
+        ~select_t ();
+
+        //  "poller" concept.
+        handle_t add_fd (fd_t fd_, struct i_poll_events *events_);
+        void rm_fd (handle_t handle_);
+        void set_pollin (handle_t handle_);
+        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 ();
+
+    private:
+
+        //  Main worker thread routine.
+        static void worker_routine (void *arg_);
+
+        //  Main event loop.
+        void loop ();
+
+        struct fd_entry_t
+        {
+            fd_t fd;
+            struct i_poll_events *events;
+        };
+
+        //  Set of file descriptors that are used to retreive
+        //  information for fd_set.
+        typedef std::vector <fd_entry_t> fd_set_t;
+        fd_set_t fds;
+
+        fd_set source_set_in;
+        fd_set source_set_out;
+        fd_set source_set_err;
+
+        fd_set readfds;
+        fd_set writefds;
+        fd_set exceptfds;
+
+        //  Maximum file descriptor.
+        fd_t maxfd;
+
+        //  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&);
+    };
+
+}
+
+#endif
+
diff --git a/src/session.cpp b/src/session.cpp
new file mode 100644
index 0000000..3cd27fb
--- /dev/null
+++ b/src/session.cpp
@@ -0,0 +1,291 @@
+/*
+    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 "session.hpp"
+#include "i_engine.hpp"
+#include "err.hpp"
+#include "pipe.hpp"
+
+zmq::session_t::session_t (object_t *parent_, socket_base_t *owner_,
+      const options_t &options_) :
+    owned_t (parent_, owner_),
+    in_pipe (NULL),
+    incomplete_in (false),
+    active (true),
+    out_pipe (NULL),
+    engine (NULL),
+    options (options_)
+{    
+    //  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_)
+{
+    if (!peer_identity.empty () && peer_identity [0] != 0) {
+        if (!owner->register_session (peer_identity, this)) {
+
+            //  TODO: There's already a session with the specified
+            //  identity. We should presumably syslog it and drop the
+            //  session.
+            zmq_assert (false);
+        }
+    }
+}
+
+zmq::session_t::~session_t ()
+{
+    zmq_assert (!in_pipe);
+    zmq_assert (!out_pipe);
+}
+
+bool zmq::session_t::read (::zmq_msg_t *msg_)
+{
+    if (!in_pipe || !active)
+        return false;
+
+    if (!in_pipe->read (msg_))
+        return false;
+
+    incomplete_in = msg_->flags & ZMQ_MSG_MORE;
+    return true;
+}
+
+bool zmq::session_t::write (::zmq_msg_t *msg_)
+{
+    if (out_pipe && out_pipe->write (msg_)) {
+        zmq_msg_init (msg_);
+        return true;
+    }
+
+    return false;
+}
+
+void zmq::session_t::flush ()
+{
+    if (out_pipe)
+        out_pipe->flush ();
+}
+
+void zmq::session_t::detach (owned_t *reconnecter_)
+{
+    //  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) {
+        out_pipe->rollback ();
+        out_pipe->flush ();
+    }
+
+    //  Remove any half-read message from the in pipe.
+    if (in_pipe) {
+        while (incomplete_in) {
+            zmq_msg_t msg;
+            zmq_msg_init (&msg);
+            if (!read (&msg)) {
+                zmq_assert (!incomplete_in);
+                break;
+            }
+            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_)
+{
+    if (inpipe_) {
+        zmq_assert (!in_pipe);
+        in_pipe = inpipe_;
+        active = true;
+        in_pipe->set_endpoint (this);
+    }
+
+    if (outpipe_) {
+        zmq_assert (!out_pipe);
+        out_pipe = outpipe_;
+        out_pipe->set_endpoint (this);
+    }
+}
+
+void zmq::session_t::detach_inpipe (reader_t *pipe_)
+{
+    active = false;
+    in_pipe = NULL;
+}
+
+void zmq::session_t::detach_outpipe (writer_t *pipe_)
+{
+    out_pipe = NULL;
+}
+
+void zmq::session_t::kill (reader_t *pipe_)
+{
+    active = false;
+}
+
+void zmq::session_t::revive (reader_t *pipe_)
+{
+    zmq_assert (in_pipe == pipe_);
+    active = true;
+    if (engine)
+        engine->revive ();
+}
+
+void zmq::session_t::revive (writer_t *pipe_)
+{
+    zmq_assert (out_pipe == pipe_);
+    if (engine)
+        engine->resume_input ();
+}
+
+void zmq::session_t::process_plug ()
+{
+}
+
+void zmq::session_t::process_unplug ()
+{
+    //  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 (out_pipe) {
+        out_pipe->term ();
+        out_pipe = NULL;
+    }
+
+    if (engine) {
+        engine->unplug ();
+        delete engine;
+        engine = NULL;
+    }
+}
+
+void zmq::session_t::process_attach (i_engine *engine_,
+    const blob_t &peer_identity_)
+{
+    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) {
+
+            //  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 ()) {
+
+        //  Store the peer identity.
+        peer_identity = peer_identity_;
+
+        //  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)) {
+
+                //  TODO: There's already a session with the specified
+                //  identity. We should presumably syslog it and drop the
+                //  session.
+                zmq_assert (false);
+            }
+        }
+    }
+
+    //  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);
+        zmq_assert (pipe);
+        out_pipe = &pipe->writer;
+        out_pipe->set_endpoint (this);
+        socket_reader = &pipe->reader;
+    }
+
+    if (options.requires_out && !in_pipe) {
+        pipe_t *pipe = new (std::nothrow) pipe_t (this, owner, options.hwm);
+        zmq_assert (pipe);
+        in_pipe = &pipe->reader;
+        in_pipe->set_endpoint (this);
+        socket_writer = &pipe->writer;
+    }
+
+    if (socket_reader || socket_writer)
+        send_bind (owner, socket_reader, socket_writer, peer_identity);
+
+    //  Plug in the engine.
+    zmq_assert (!engine);
+    zmq_assert (engine_);
+    engine = engine_;
+    engine->plug (this);
+}
diff --git a/src/session.hpp b/src/session.hpp
new file mode 100644
index 0000000..9bda1ad
--- /dev/null
+++ b/src/session.hpp
@@ -0,0 +1,104 @@
+/*
+    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_SESSION_HPP_INCLUDED__
+#define __ZMQ_SESSION_HPP_INCLUDED__
+
+#include "i_inout.hpp"
+#include "i_endpoint.hpp"
+#include "owned.hpp"
+#include "options.hpp"
+#include "blob.hpp"
+
+namespace zmq
+{
+
+    class session_t : public owned_t, public i_inout, public i_endpoint
+    {
+    public:
+
+        //  Creates unnamed session.
+        session_t (object_t *parent_, socket_base_t *owner_,
+            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.
+        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 ();
+
+        //  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:
+
+        ~session_t ();
+
+        //  Handlers for incoming commands.
+        void process_plug ();
+        void process_unplug ();
+        void process_attach (struct i_engine *engine_,
+            const blob_t &peer_identity_);
+
+        //  Inbound pipe, i.e. one the session is getting messages from.
+        class reader_t *in_pipe;
+
+        //  This flag is true if the remainder of the message being processed
+        //  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;
+
+        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;
+
+        //  Identity of the peer.
+        blob_t peer_identity;
+
+        //  Inherited socket options.
+        options_t options;
+
+        session_t (const session_t&);
+        void operator = (const session_t&);
+    };
+
+}
+
+#endif
diff --git a/src/signaler.cpp b/src/signaler.cpp
new file mode 100644
index 0000000..592688b
--- /dev/null
+++ b/src/signaler.cpp
@@ -0,0 +1,339 @@
+/*
+    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 = send (w, &cmd_, sizeof (command_t), 0);
+    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 = recv (r, buffer, sizeof (command_t), 0);
+    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 = ::send (w, &cmd_, sizeof (command_t), 0);
+    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 = ::recv (r, cmd_, sizeof (command_t),
+        block_ ? 0 : MSG_DONTWAIT);
+
+    //  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
new file mode 100644
index 0000000..64a1899
--- /dev/null
+++ b/src/signaler.hpp
@@ -0,0 +1,71 @@
+/*
+    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
new file mode 100644
index 0000000..eddb297
--- /dev/null
+++ b/src/socket_base.cpp
@@ -0,0 +1,681 @@
+/*
+    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 <string>
+#include <algorithm>
+
+#include "../include/zmq.h"
+
+#include "socket_base.hpp"
+#include "app_thread.hpp"
+
+#include "zmq_listener.hpp"
+#include "zmq_connecter.hpp"
+#include "io_thread.hpp"
+#include "session.hpp"
+#include "config.hpp"
+#include "owned.hpp"
+#include "pipe.hpp"
+#include "err.hpp"
+#include "ctx.hpp"
+#include "platform.hpp"
+#include "pgm_sender.hpp"
+#include "pgm_receiver.hpp"
+#include "likely.hpp"
+
+zmq::socket_base_t::socket_base_t (app_thread_t *parent_) :
+    object_t (parent_),
+    pending_term_acks (0),
+    ticks (0),
+    rcvmore (false),
+    app_thread (parent_),
+    shutting_down (false),
+    sent_seqnum (0),
+    processed_seqnum (0),
+    next_ordinal (1)
+{
+}
+
+zmq::socket_base_t::~socket_base_t ()
+{
+}
+
+int zmq::socket_base_t::setsockopt (int option_, const void *optval_,
+    size_t optvallen_)
+{
+    if (unlikely (app_thread->is_terminated ())) {
+        errno = ETERM;
+        return -1;
+    }
+
+    //  First, check whether specific socket type overloads the option.
+    int rc = xsetsockopt (option_, optval_, optvallen_);
+    if (rc == 0 || errno != EINVAL)
+        return rc;
+
+    //  If the socket type doesn't support the option, pass it to
+    //  the generic option parser.
+    return options.setsockopt (option_, optval_, optvallen_);
+}
+
+int zmq::socket_base_t::getsockopt (int option_, void *optval_,
+    size_t *optvallen_)
+{
+    if (unlikely (app_thread->is_terminated ())) {
+        errno = ETERM;
+        return -1;
+    }
+
+    if (option_ == ZMQ_RCVMORE) {
+        if (*optvallen_ < sizeof (int64_t)) {
+            errno = EINVAL;
+            return -1;
+        }
+        *((int64_t*) optval_) = rcvmore ? 1 : 0;
+        *optvallen_ = sizeof (int64_t);
+        return 0;
+    }
+
+    return options.getsockopt (option_, optval_, optvallen_);
+}
+
+int zmq::socket_base_t::bind (const char *addr_)
+{
+    if (unlikely (app_thread->is_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;
+        return -1;
+    }
+
+    addr_type = addr.substr (0, pos);
+    addr_args = addr.substr (pos + 3);
+
+    if (addr_type == "inproc")
+        return register_endpoint (addr_args.c_str (), this);
+
+    if (addr_type == "tcp" || addr_type == "ipc") {
+
+#if defined ZMQ_HAVE_WINDOWS || defined ZMQ_HAVE_OPENVMS
+        if (addr_type == "ipc") {
+            errno = EPROTONOSUPPORT;
+            return -1;
+        }
+#endif
+
+        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 ());
+        if (rc != 0) {
+            delete listener;
+            return -1;
+        }
+
+        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.
+        return connect (addr_); 
+    }
+#endif
+
+    //  Unknown protocol.
+    errno = EPROTONOSUPPORT;
+    return -1;
+}
+
+int zmq::socket_base_t::connect (const char *addr_)
+{
+    if (unlikely (app_thread->is_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;
+        return -1;
+    }
+
+    addr_type = addr.substr (0, pos);
+    addr_args = addr.substr (pos + 3);
+
+    if (addr_type == "inproc") {
+
+        //  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)
+            return -1;
+
+        pipe_t *in_pipe = NULL;
+        pipe_t *out_pipe = NULL;
+
+        //  Create inbound pipe, if required.
+        if (options.requires_in) {
+            in_pipe = new (std::nothrow) pipe_t (this, peer, options.hwm);
+            zmq_assert (in_pipe);
+        }
+
+        //  Create outbound pipe, if required.
+        if (options.requires_out) {
+            out_pipe = new (std::nothrow) pipe_t (peer, this, options.hwm);
+            zmq_assert (out_pipe);
+        }
+
+        //  Attach the pipes to this socket object.
+        attach_pipes (in_pipe ? &in_pipe->reader : NULL,
+            out_pipe ? &out_pipe->writer : NULL, blob_t ());
+
+        //  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);
+
+        return 0;
+    }
+
+    //  Create unnamed session.
+    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 'immediate connect' feature is required, we'll created 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;
+
+        //  Create inbound pipe, if required.
+        if (options.requires_in) {
+            in_pipe = new (std::nothrow) pipe_t (this, session, options.hwm);
+            zmq_assert (in_pipe);
+
+        }
+
+        //  Create outbound pipe, if required.
+        if (options.requires_out) {
+            out_pipe = new (std::nothrow) pipe_t (session, this, options.hwm);
+            zmq_assert (out_pipe);
+        }
+
+        //  Attach the pipes to the socket object.
+        attach_pipes (in_pipe ? &in_pipe->reader : NULL,
+            out_pipe ? &out_pipe->writer : NULL, 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 ());
+    }
+
+    //  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);
+
+        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;
+}
+
+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))) {
+        errno = ETERM;
+        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_);
+    if (rc == 0)
+        return 0;
+
+    //  In case of non-blocking send we'll simply propagate
+    //  the error - including EAGAIN - upwards.
+    if (flags_ & ZMQ_NOBLOCK)
+        return -1;
+
+    //  Oops, we couldn't send the message. Wait for the next
+    //  command, process it and try to send the message again.
+    while (rc != 0) {
+        if (errno != EAGAIN)
+            return -1;
+        if (unlikely (!app_thread->process_commands (true, false))) {
+            errno = ETERM;
+            return -1;
+        }
+        rc = xsend (msg_, flags_);
+    }
+    return 0;
+}
+
+int zmq::socket_base_t::recv (::zmq_msg_t *msg_, int flags_)
+{
+    //  Get the message.
+    int rc = xrecv (msg_, flags_);
+    int err = errno;
+
+    //  Once every inbound_poll_rate messages check for signals and process
+    //  incoming commands. This happens only if we are not polling altogether
+    //  because there are messages available all the time. If poll occurs,
+    //  ticks is set to zero and thus we avoid this code.
+    //
+    //  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.
+    if (++ticks == inbound_poll_rate) {
+        if (unlikely (!app_thread->process_commands (false, false))) {
+            errno = ETERM;
+            return -1;
+        }
+        ticks = 0;
+    }
+
+    //  If we have the message, return immediately.
+    if (rc == 0) {
+        rcvmore = msg_->flags & ZMQ_MSG_MORE;
+        if (rcvmore)
+            msg_->flags &= ~ZMQ_MSG_MORE;
+        return 0;
+    }
+
+    //  If we don't have the message, restore the original cause of the problem.
+    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.
+    if (flags_ & ZMQ_NOBLOCK) {
+        if (errno != EAGAIN)
+            return -1;
+        if (unlikely (!app_thread->process_commands (false, false))) {
+            errno = ETERM;
+            return -1;
+        }
+        ticks = 0;
+        return xrecv (msg_, flags_);
+    }
+
+    //  In blocking scenario, commands are processed over and over again until
+    //  we are able to fetch a message.
+    while (rc != 0) {
+        if (errno != EAGAIN)
+            return -1;
+        if (unlikely (!app_thread->process_commands (true, false))) {
+            errno = ETERM;
+            return -1;
+        }
+        rc = xrecv (msg_, flags_);
+        ticks = 0;
+    }
+
+    rcvmore = msg_->flags & ZMQ_MSG_MORE;
+    if (rcvmore)
+        msg_->flags &= ~ZMQ_MSG_MORE;
+    return 0;
+}
+
+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 ();
+
+    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 ();
+}
+
+bool zmq::socket_base_t::has_out ()
+{
+    return xhas_out ();
+}
+
+bool zmq::socket_base_t::register_session (const blob_t &peer_identity_,
+    session_t *session_)
+{
+    sessions_sync.lock ();
+    bool registered = named_sessions.insert (
+        std::make_pair (peer_identity_, session_)).second;
+    sessions_sync.unlock ();
+    return registered;
+}
+
+void zmq::socket_base_t::unregister_session (const blob_t &peer_identity_)
+{
+    sessions_sync.lock ();
+    named_sessions_t::iterator it = named_sessions.find (peer_identity_);
+    zmq_assert (it != named_sessions.end ());
+    named_sessions.erase (it);
+    sessions_sync.unlock ();
+}
+
+zmq::session_t *zmq::socket_base_t::find_session (const blob_t &peer_identity_)
+{
+    sessions_sync.lock ();
+    named_sessions_t::iterator it = named_sessions.find (peer_identity_);
+    if (it == named_sessions.end ()) {
+        sessions_sync.unlock ();
+        return NULL;
+    }
+    session_t *session = it->second;
+
+    //  Prepare the session for subsequent attach command.
+    session->inc_seqnum ();
+
+    sessions_sync.unlock ();
+    return session;    
+}
+
+uint64_t zmq::socket_base_t::register_session (session_t *session_)
+{
+    sessions_sync.lock ();
+    uint64_t ordinal = next_ordinal;
+    next_ordinal++;
+    unnamed_sessions.insert (std::make_pair (ordinal, session_));
+    sessions_sync.unlock ();
+    return ordinal;
+}
+
+void zmq::socket_base_t::unregister_session (uint64_t ordinal_)
+{
+    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 ();
+}
+
+zmq::session_t *zmq::socket_base_t::find_session (uint64_t ordinal_)
+{
+    sessions_sync.lock ();
+
+    unnamed_sessions_t::iterator it = unnamed_sessions.find (ordinal_);
+    if (it == unnamed_sessions.end ()) {
+        sessions_sync.unlock ();
+        return NULL;
+    }
+    session_t *session = it->second;
+
+    //  Prepare the session for subsequent attach command.
+    session->inc_seqnum ();
+
+    sessions_sync.unlock ();
+    return session; 
+}
+
+void zmq::socket_base_t::kill (reader_t *pipe_)
+{
+    xkill (pipe_);
+}
+
+void zmq::socket_base_t::revive (reader_t *pipe_)
+{
+    xrevive (pipe_);
+}
+
+void zmq::socket_base_t::revive (writer_t *pipe_)
+{
+    xrevive (pipe_);
+}
+
+void zmq::socket_base_t::attach_pipes (class reader_t *inpipe_,
+    class writer_t *outpipe_, const blob_t &peer_identity_)
+{
+    if (inpipe_)
+        inpipe_->set_endpoint (this);
+    if (outpipe_)
+        outpipe_->set_endpoint (this);
+    xattach_pipes (inpipe_, outpipe_, peer_identity_);
+}
+
+void zmq::socket_base_t::detach_inpipe (class reader_t *pipe_)
+{
+    xdetach_inpipe (pipe_);
+    pipe_->set_endpoint (NULL); // ?
+}
+
+void zmq::socket_base_t::detach_outpipe (class writer_t *pipe_)
+{
+    xdetach_outpipe (pipe_);
+    pipe_->set_endpoint (NULL); // ?
+}
+
+void zmq::socket_base_t::process_own (owned_t *object_)
+{
+    io_objects.insert (object_);
+}
+
+void zmq::socket_base_t::process_bind (reader_t *in_pipe_, writer_t *out_pipe_,
+    const blob_t &peer_identity_)
+{
+    attach_pipes (in_pipe_, out_pipe_, peer_identity_);
+}
+
+void zmq::socket_base_t::process_term_req (owned_t *object_)
+{
+    //  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_);
+
+    //  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;
+
+    pending_term_acks++;
+    io_objects.erase (it);
+    send_term (object_);
+}
+
+void zmq::socket_base_t::process_term_ack ()
+{
+    zmq_assert (pending_term_acks);
+    pending_term_acks--;
+}
+
+void zmq::socket_base_t::process_seqnum ()
+{
+    processed_seqnum++;
+}
+
diff --git a/src/socket_base.hpp b/src/socket_base.hpp
new file mode 100644
index 0000000..3d95cec
--- /dev/null
+++ b/src/socket_base.hpp
@@ -0,0 +1,177 @@
+/*
+    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_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 "mutex.hpp"
+#include "options.hpp"
+#include "stdint.hpp"
+#include "atomic_counter.hpp"
+#include "stdint.hpp"
+#include "blob.hpp"
+
+namespace zmq
+{
+
+    class socket_base_t :
+        public object_t, public i_endpoint, public yarray_item_t
+    {
+    public:
+
+        socket_base_t (class app_thread_t *parent_);
+
+        //  Interface for communication with the API layer.
+        int setsockopt (int option_, const void *optval_, size_t optvallen_);
+        int getsockopt (int option_, void *optval_, size_t *optvallen_);
+        int bind (const char *addr_);
+        int connect (const char *addr_);
+        int send (zmq_msg_t *msg_, int flags_);
+        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_);
+
+    protected:
+
+        //  Destructor is protected. Socket is closed using 'close' function.
+        virtual ~socket_base_t ();
+
+        //  Pipe management is done 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.
+        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;
+
+        //  Socket options.
+        options_t options;
+
+    private:
+
+        //  Handlers for incoming commands.
+        void process_own (class owned_t *object_);
+        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 ();
+
+        //  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;
+
+        //  Number of I/O objects that were already asked to terminate
+        //  but haven't acknowledged it yet.
+        int pending_term_acks;
+
+        //  Number of messages received since last command processing.
+        int ticks;
+
+        //  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
+        //  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;
+        mutex_t sessions_sync;
+
+        socket_base_t (const socket_base_t&);
+        void operator = (const socket_base_t&);
+    };
+
+}
+
+#endif
diff --git a/src/stdint.hpp b/src/stdint.hpp
new file mode 100644
index 0000000..fe1bff6
--- /dev/null
+++ b/src/stdint.hpp
@@ -0,0 +1,70 @@
+/*
+    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_STDINT_HPP_INCLUDED__
+#define __ZMQ_STDINT_HPP_INCLUDED__
+
+#include "platform.hpp"
+
+#ifdef ZMQ_HAVE_SOLARIS
+
+#include <inttypes.h>
+
+#elif defined _MSC_VER
+
+#ifndef int8_t
+typedef __int8 int8_t;
+#endif
+#ifndef int16_t
+typedef __int16 int16_t;
+#endif
+#ifndef int32_t
+typedef __int32 int32_t;
+#endif
+#ifndef int64_t
+typedef __int64 int64_t;
+#endif
+#ifndef uint8_t
+typedef unsigned __int8 uint8_t;
+#endif
+#ifndef uint16_t
+typedef unsigned __int16 uint16_t;
+#endif
+#ifndef uint32_t
+typedef unsigned __int32 uint32_t;
+#endif
+#ifndef uint64_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>
+
+#endif
+
+#endif
diff --git a/src/streamer.cpp b/src/streamer.cpp
new file mode 100644
index 0000000..796771b
--- /dev/null
+++ b/src/streamer.cpp
@@ -0,0 +1,38 @@
+/*
+    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 "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);
+
+    while (true) {
+        insocket_->recv (&msg, 0);
+        outsocket_->send (&msg, 0);
+    }
+
+    return 0;
+}
diff --git a/src/streamer.hpp b/src/streamer.hpp
new file mode 100644
index 0000000..8827cff
--- /dev/null
+++ b/src/streamer.hpp
@@ -0,0 +1,31 @@
+/*
+    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_STREAMER_HPP_INCLUDED__
+#define __ZMQ_STREAMER_HPP_INCLUDED__
+
+namespace zmq
+{
+
+    int streamer (class socket_base_t *insocket_,
+        class socket_base_t *outsocket_);
+
+}
+
+#endif
diff --git a/src/sub.cpp b/src/sub.cpp
new file mode 100644
index 0000000..eeb50cd
--- /dev/null
+++ b/src/sub.cpp
@@ -0,0 +1,191 @@
+/*
+    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 <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)
+{
+    options.requires_in = true;
+    options.requires_out = false;
+    zmq_msg_init (&message);
+}
+
+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;
+    }
+
+    errno = EINVAL;
+    return -1;
+}
+
+int zmq::sub_t::xsend (zmq_msg_t *msg_, int flags_)
+{
+    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 ()
+{
+    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
new file mode 100644
index 0000000..7b997c9
--- /dev/null
+++ b/src/sub.hpp
@@ -0,0 +1,81 @@
+/*
+    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_SUB_HPP_INCLUDED__
+#define __ZMQ_SUB_HPP_INCLUDED__
+
+#include "../include/zmq.h"
+
+#include "prefix_tree.hpp"
+#include "socket_base.hpp"
+#include "fq.hpp"
+
+namespace zmq
+{
+
+    class sub_t : public socket_base_t
+    {
+    public:
+
+        sub_t (class app_thread_t *parent_);
+        ~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 ();
+
+    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&);
+    };
+
+}
+
+#endif
diff --git a/src/tcp_connecter.cpp b/src/tcp_connecter.cpp
new file mode 100644
index 0000000..17c0257
--- /dev/null
+++ b/src/tcp_connecter.cpp
@@ -0,0 +1,307 @@
+/*
+    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 <string.h>
+
+#include <string>
+
+#include "../include/zmq.h"
+
+#include "tcp_connecter.hpp"
+#include "platform.hpp"
+#include "ip.hpp"
+#include "err.hpp"
+
+#ifdef ZMQ_HAVE_WINDOWS
+
+zmq::tcp_connecter_t::tcp_connecter_t () :
+    s (retired_fd)
+{
+    memset (&addr, 0, sizeof (addr));
+    addr_len = 0;
+}
+
+zmq::tcp_connecter_t::~tcp_connecter_t ()
+{
+    if (s != retired_fd)
+        close ();
+}
+
+int zmq::tcp_connecter_t::set_address (const char *protocol_, const char *addr_)
+{
+    if (strcmp (protocol_, "tcp") == 0)
+        return resolve_ip_hostname (&addr, &addr_len, addr_);
+
+    errno = EPROTONOSUPPORT;
+    return -1;    
+}
+
+int zmq::tcp_connecter_t::open ()
+{
+    zmq_assert (s == retired_fd);
+
+    //  Create the socket.
+    s = socket (addr.ss_family, SOCK_STREAM, IPPROTO_TCP);
+    if (s == INVALID_SOCKET) {
+        wsa_error_to_errno ();
+        return -1;
+    }
+
+    // Set to non-blocking mode.
+    unsigned long argp = 1;
+    int rc = ioctlsocket (s, FIONBIO, &argp);
+    wsa_assert (rc != SOCKET_ERROR);
+
+    //  Disable Nagle's algorithm.
+    int flag = 1;
+    rc = setsockopt (s, IPPROTO_TCP, TCP_NODELAY, (char*) &flag,
+        sizeof (int));
+    wsa_assert (rc != SOCKET_ERROR);
+
+    //  Connect to the remote peer.
+    rc = ::connect (s, (sockaddr*) &addr, addr_len);
+
+    //  Connect was successfull immediately.
+    if (rc == 0)
+        return 0;
+
+    //  Asynchronous connect was launched.
+    if (rc == SOCKET_ERROR && (WSAGetLastError () == WSAEINPROGRESS ||
+          WSAGetLastError () == WSAEWOULDBLOCK)) {
+        errno = EAGAIN;
+        return -1;
+    }
+    
+    wsa_error_to_errno ();
+    return -1;
+}
+
+int zmq::tcp_connecter_t::close ()
+{
+    zmq_assert (s != retired_fd);
+    int rc = closesocket (s);
+    wsa_assert (rc != SOCKET_ERROR);
+    s = retired_fd;
+    return 0;
+}
+
+zmq::fd_t zmq::tcp_connecter_t::get_fd ()
+{
+    return s;
+}
+
+zmq::fd_t zmq::tcp_connecter_t::connect ()
+{
+    //  Nonblocking connect have finished. Check whether an error occured.
+    int err = 0;
+    socklen_t len = sizeof err;
+    int rc = getsockopt (s, SOL_SOCKET, SO_ERROR, (char*) &err, &len);
+    zmq_assert (rc == 0);
+    if (err != 0) {
+
+        //  Assert that the error was caused by the networking problems
+        //  rather than 0MQ bug.
+        zmq_assert (err == WSAECONNREFUSED || err == WSAETIMEDOUT ||
+            err == WSAECONNABORTED);
+
+        errno = err;
+        return retired_fd;
+    }
+
+    //  Return the newly connected socket.
+    fd_t result = s;
+    s = retired_fd;
+    return result;
+}
+
+#else
+
+#include <unistd.h>
+#include <sys/socket.h>
+#include <arpa/inet.h>
+#include <netinet/tcp.h>
+#include <netinet/in.h>
+#include <netdb.h>
+#include <fcntl.h>
+
+#ifdef ZMQ_HAVE_OPENVMS
+#include <ioctl.h>
+#endif
+
+zmq::tcp_connecter_t::tcp_connecter_t () :
+    s (retired_fd)
+{
+    memset (&addr, 0, sizeof (addr));
+}
+
+zmq::tcp_connecter_t::~tcp_connecter_t ()
+{
+    if (s != retired_fd)
+        close ();
+}
+
+int zmq::tcp_connecter_t::set_address (const char *protocol_, const char *addr_)
+{
+    if (strcmp (protocol_, "tcp") == 0)
+        return resolve_ip_hostname (&addr, &addr_len, addr_);
+    else if (strcmp (protocol_, "ipc") == 0)
+        return resolve_local_path (&addr, &addr_len, addr_);
+
+    errno = EPROTONOSUPPORT;
+    return -1;
+}
+
+int zmq::tcp_connecter_t::open ()
+{
+    zmq_assert (s == retired_fd);
+    struct sockaddr *sa = (struct sockaddr*) &addr;
+
+    if (AF_UNIX != sa->sa_family) {
+
+        //  Create the socket.
+        s = socket (sa->sa_family, SOCK_STREAM, IPPROTO_TCP);
+        if (s == -1)
+            return -1;
+
+        // Set to non-blocking mode.
+#ifdef ZMQ_HAVE_OPENVMS
+    	int flags = 1;
+    	int rc = ioctl (s, FIONBIO, &flags);
+        errno_assert (rc != -1);
+#else
+    	int flags = fcntl (s, F_GETFL, 0);
+    	if (flags == -1)
+            flags = 0;
+    	int rc = fcntl (s, F_SETFL, flags | O_NONBLOCK);
+        errno_assert (rc != -1);
+#endif
+
+        //  Disable Nagle's algorithm.
+        int flag = 1;
+        rc = setsockopt (s, IPPROTO_TCP, TCP_NODELAY, (char*) &flag,
+            sizeof (int));
+        errno_assert (rc == 0);
+
+#ifdef ZMQ_HAVE_OPENVMS
+        //  Disable delayed acknowledgements.
+        flag = 1;
+        rc = setsockopt (s, IPPROTO_TCP, TCP_NODELACK, (char*) &flag,
+            sizeof (int));
+        errno_assert (rc != SOCKET_ERROR);
+#endif
+
+        //  Connect to the remote peer.
+        rc = ::connect (s, (struct sockaddr*) &addr, addr_len);
+
+        //  Connect was successfull immediately.
+        if (rc == 0)
+            return 0;
+
+        //  Asynchronous connect was launched.
+        if (rc == -1 && errno == EINPROGRESS) {
+            errno = EAGAIN;
+            return -1;
+        }
+
+        //  Error occured.
+        int err = errno;
+        close ();
+        errno = err;
+        return -1;
+    }
+
+#ifndef ZMQ_HAVE_OPENVMS
+    else {
+
+        //  Create the socket.
+        zmq_assert (AF_UNIX == sa->sa_family);
+        s = socket (AF_UNIX, SOCK_STREAM, 0);
+        if (s == -1)
+            return -1;
+
+        //  Set the non-blocking flag.
+        int flag = fcntl (s, F_GETFL, 0);
+        if (flag == -1) 
+            flag = 0;
+        int rc = fcntl (s, F_SETFL, flag | O_NONBLOCK);
+        errno_assert (rc != -1);
+
+        //  Connect to the remote peer.
+        rc = ::connect (s, (struct sockaddr*) &addr, sizeof (sockaddr_un));
+
+        //  Connect was successfull immediately.
+        if (rc == 0)
+            return 0;
+
+        //  Error occured.
+        int err = errno;
+        close ();
+        errno = err;
+        return -1;
+    }
+#endif
+
+    zmq_assert (false);
+    return -1;
+}
+
+int zmq::tcp_connecter_t::close ()
+{
+    zmq_assert (s != retired_fd);
+    int rc = ::close (s);
+    if (rc != 0)
+        return -1;
+    s = retired_fd;
+    return 0;
+}
+
+zmq::fd_t zmq::tcp_connecter_t::get_fd ()
+{
+    return s;
+}
+
+zmq::fd_t zmq::tcp_connecter_t::connect ()
+{
+    //  Following code should handle both Berkeley-derived socket
+    //  implementations and Solaris.
+    int err = 0;
+#if defined ZMQ_HAVE_HPUX
+    int len = sizeof (err);
+#else
+    socklen_t len = sizeof (err);
+#endif
+    int rc = getsockopt (s, SOL_SOCKET, SO_ERROR, (char*) &err, &len);
+    if (rc == -1)
+        err = errno;
+    if (err != 0) {
+
+        //  Assert that the error was caused by the networking problems
+        //  rather than 0MQ bug.
+        zmq_assert (err == ECONNREFUSED || err == ETIMEDOUT);
+
+        errno = err;
+        return retired_fd;
+    }
+
+    fd_t result = s;
+    s = retired_fd;
+    return result;
+}
+
+#endif
diff --git a/src/tcp_connecter.hpp b/src/tcp_connecter.hpp
new file mode 100644
index 0000000..f1a124f
--- /dev/null
+++ b/src/tcp_connecter.hpp
@@ -0,0 +1,80 @@
+/*
+    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_TCP_CONNECTER_HPP_INCLUDED__
+#define __ZMQ_TCP_CONNECTER_HPP_INCLUDED__
+
+#include "platform.hpp"
+#include "fd.hpp"
+
+#ifdef ZMQ_HAVE_WINDOWS
+#include "windows.hpp"
+#else
+#include <sys/types.h>
+#include <sys/socket.h>
+#endif
+
+namespace zmq
+{
+
+    //  The class encapsulating simple TCP listening socket.
+
+    class tcp_connecter_t
+    {
+    public:
+
+        tcp_connecter_t ();
+        ~tcp_connecter_t ();
+
+        //  Set address to connect to.
+        int set_address (const char *protocol, const char *addr_);
+
+        //  Open TCP connecting socket. Address is in
+        //  <hostname>:<port-number> format. Returns -1 in case of error,
+        //  0 if connect was successfull immediately and 1 if async connect
+        //  was launched.
+        int open ();
+
+        //  Close the connecting socket.
+        int close ();
+
+        //  Get the file descriptor to poll on to get notified about
+        //  connection success.
+        fd_t get_fd ();
+
+        //  Get the file descriptor of newly created connection. Returns
+        //  retired_fd if the connection was unsuccessfull.
+        fd_t connect ();
+
+    private:
+
+        //  Address to connect to.
+        sockaddr_storage addr;
+        socklen_t addr_len;
+
+        //  Underlying socket.
+        fd_t s;
+
+        tcp_connecter_t (const tcp_connecter_t&);
+        void operator = (const tcp_connecter_t&);
+    };
+
+}
+
+#endif
diff --git a/src/tcp_listener.cpp b/src/tcp_listener.cpp
new file mode 100644
index 0000000..0cb9a6e
--- /dev/null
+++ b/src/tcp_listener.cpp
@@ -0,0 +1,352 @@
+/*
+    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 <string.h>
+
+#include "../include/zmq.h"
+
+#include "tcp_listener.hpp"
+#include "platform.hpp"
+#include "ip.hpp"
+#include "config.hpp"
+#include "err.hpp"
+
+#ifdef ZMQ_HAVE_WINDOWS
+
+zmq::tcp_listener_t::tcp_listener_t () :
+    s (retired_fd)
+{
+    memset (&addr, 0, sizeof (addr));
+    addr_len = 0;
+}
+
+zmq::tcp_listener_t::~tcp_listener_t ()
+{
+    if (s != retired_fd)
+        close ();
+}
+
+int zmq::tcp_listener_t::set_address (const char *protocol_, const char *addr_)
+{
+    //  IPC protocol is not supported on Windows platform.
+    if (strcmp (protocol_, "tcp") != 0 ) {
+        errno = EPROTONOSUPPORT;
+        return -1;
+    }
+
+    //  Convert the interface into sockaddr_in structure.
+    int rc = resolve_ip_interface (&addr, &addr_len, addr_);
+    if (rc != 0)
+        return rc;
+
+    //  Create a listening socket.
+    s = socket (addr.ss_family, SOCK_STREAM, IPPROTO_TCP);
+    if (s == INVALID_SOCKET) {
+        wsa_error_to_errno ();
+        return -1;
+    }
+
+    //  Allow reusing of the address.
+    int flag = 1;
+    rc = setsockopt (s, SOL_SOCKET, SO_REUSEADDR,
+        (const char*) &flag, sizeof (int));
+    wsa_assert (rc != SOCKET_ERROR);
+
+    //  Set the non-blocking flag.
+    u_long uflag = 1;
+    rc = ioctlsocket (s, FIONBIO, &uflag);
+    wsa_assert (rc != SOCKET_ERROR);
+
+    //  Bind the socket to the network interface and port.
+    rc = bind (s, (struct sockaddr*) &addr, addr_len);
+    if (rc == SOCKET_ERROR) {
+        wsa_error_to_errno ();
+        return -1;
+    }
+
+    //  Listen for incomming connections.
+    rc = listen (s, 1);
+    if (rc == SOCKET_ERROR) {
+        wsa_error_to_errno ();
+        return -1;
+    }
+
+    return 0;
+}
+
+int zmq::tcp_listener_t::close ()
+{
+    zmq_assert (s != retired_fd);
+    int rc = closesocket (s);
+    wsa_assert (rc != SOCKET_ERROR);
+    s = retired_fd;
+    return 0;
+}
+
+zmq::fd_t zmq::tcp_listener_t::get_fd ()
+{
+    return s;
+}
+
+zmq::fd_t zmq::tcp_listener_t::accept ()
+{
+    zmq_assert (s != retired_fd);
+
+    //  Accept one incoming connection.
+    fd_t sock = ::accept (s, NULL, NULL);
+    if (sock == INVALID_SOCKET && 
+          (WSAGetLastError () == WSAEWOULDBLOCK ||
+          WSAGetLastError () == WSAECONNRESET))
+        return retired_fd;
+
+    zmq_assert (sock != INVALID_SOCKET);
+
+    // Set to non-blocking mode.
+    unsigned long argp = 1;
+    int rc = ioctlsocket (sock, FIONBIO, &argp);
+    wsa_assert (rc != SOCKET_ERROR);
+
+    //  Disable Nagle's algorithm.
+    int flag = 1;
+    rc = setsockopt (sock, IPPROTO_TCP, TCP_NODELAY, (char*) &flag,
+        sizeof (int));
+    wsa_assert (rc != SOCKET_ERROR);
+
+    return sock;
+}
+
+#else
+
+#include <unistd.h>
+#include <sys/socket.h>
+#include <arpa/inet.h>
+#include <netinet/tcp.h>
+#include <netinet/in.h>
+#include <netdb.h>
+#include <fcntl.h>
+
+#ifndef ZMQ_HAVE_OPENVMS
+#include <sys/un.h>
+#endif
+
+#ifdef ZMQ_HAVE_OPENVMS
+#include <ioctl.h>
+#endif
+
+zmq::tcp_listener_t::tcp_listener_t () :
+    s (retired_fd)
+{
+    memset (&addr, 0, sizeof (addr));
+}
+
+zmq::tcp_listener_t::~tcp_listener_t ()
+{
+    if (s != retired_fd)
+        close ();
+}
+
+int zmq::tcp_listener_t::set_address (const char *protocol_, const char *addr_)
+{
+    if (strcmp (protocol_, "tcp") == 0 ) {
+
+        //  Resolve the sockaddr to bind to.
+        int rc = resolve_ip_interface (&addr, &addr_len, addr_);
+        if (rc != 0)
+            return -1;
+
+        //  Create a listening socket.
+        s = socket (addr.ss_family, SOCK_STREAM, IPPROTO_TCP);
+        if (s == -1)
+            return -1;
+
+        //  Allow reusing of the address.
+        int flag = 1;
+        rc = setsockopt (s, SOL_SOCKET, SO_REUSEADDR, &flag, sizeof (int));
+        errno_assert (rc == 0);
+
+        //  Set the non-blocking flag.
+#ifdef ZMQ_HAVE_OPENVMS
+    	flag = 1;
+    	rc = ioctl (s, FIONBIO, &flag);
+        errno_assert (rc != -1);
+#else
+    	flag = fcntl (s, F_GETFL, 0);
+    	if (flag == -1)
+            flag = 0;
+    	rc = fcntl (s, F_SETFL, flag | O_NONBLOCK);
+        errno_assert (rc != -1);
+#endif
+
+        //  Bind the socket to the network interface and port.
+        rc = bind (s, (struct sockaddr*) &addr, addr_len);
+        if (rc != 0) {
+            close ();
+            return -1;
+        }
+
+        //  Listen for incomming connections.
+        rc = listen (s, tcp_connection_backlog);
+        if (rc != 0) {
+            close ();
+            return -1;
+        }
+
+        return 0;
+    }
+#ifndef ZMQ_HAVE_OPENVMS
+    else if (strcmp (protocol_, "ipc") == 0) {
+
+        //  Get rid of the file associated with the UNIX domain socket that
+        //  may have been left behind by the previous run of the application.
+        ::unlink (addr_);
+
+        //  Convert the address into sockaddr_un structure.
+        int rc = resolve_local_path (&addr, &addr_len, addr_);
+        if (rc != 0)
+            return -1;
+
+        //  Create a listening socket.
+        s = socket (AF_UNIX, SOCK_STREAM, 0);
+        if (s == -1)
+            return -1;
+
+        //  Set the non-blocking flag.
+        int flag = fcntl (s, F_GETFL, 0);
+        if (flag == -1) 
+            flag = 0;
+        rc = fcntl (s, F_SETFL, flag | O_NONBLOCK);
+        errno_assert (rc != -1);
+
+        //  Bind the socket to the file path.
+        rc = bind (s, (struct sockaddr*) &addr, sizeof (sockaddr_un));
+        if (rc != 0) {
+            close ();
+            return -1;
+        }
+
+        //  Listen for incomming connections.
+        rc = listen (s, tcp_connection_backlog);
+        if (rc != 0) {
+            close ();
+            return -1;
+        }
+
+        return 0;
+    }
+#endif
+    else {
+        errno = EPROTONOSUPPORT;
+        return -1;
+    }    
+}
+
+int zmq::tcp_listener_t::close ()
+{
+    zmq_assert (s != retired_fd);
+    int rc = ::close (s);
+    if (rc != 0)
+        return -1;
+    s = retired_fd;
+
+#ifndef ZMQ_HAVE_OPENVMS
+    //  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) {
+        rc = ::unlink(su->sun_path);
+        if (rc != 0)
+            return -1;
+    }
+#endif
+
+    return 0;
+}
+
+zmq::fd_t zmq::tcp_listener_t::get_fd ()
+{
+    return s;
+}
+
+zmq::fd_t zmq::tcp_listener_t::accept ()
+{
+    zmq_assert (s != retired_fd);
+
+    //  Accept one incoming connection.
+    fd_t sock = ::accept (s, NULL, NULL);
+
+#if (defined ZMQ_HAVE_LINUX || defined ZMQ_HAVE_FREEBSD || \
+     defined ZMQ_HAVE_OPENBSD || defined ZMQ_HAVE_OSX || \
+     defined ZMQ_HAVE_OPENVMS || defined ZMQ_HAVE_NETBSD)
+    if (sock == -1 && 
+        (errno == EAGAIN || errno == EWOULDBLOCK || 
+         errno == EINTR || errno == ECONNABORTED))
+        return retired_fd;
+#elif (defined ZMQ_HAVE_SOLARIS || defined ZMQ_HAVE_AIX)
+    if (sock == -1 && 
+        (errno == EWOULDBLOCK || errno == EINTR || 
+         errno == ECONNABORTED || errno == EPROTO))
+        return retired_fd;
+#elif defined ZMQ_HAVE_HPUX
+    if (sock == -1 && 
+        (errno == EAGAIN || errno == EWOULDBLOCK || 
+         errno == EINTR || errno == ECONNABORTED || errno == ENOBUFS))
+        return retired_fd;
+#elif defined ZMQ_HAVE_QNXNTO 
+    if (sock == -1 && 
+        (errno == EWOULDBLOCK || errno == EINTR || errno == ECONNABORTED))
+        return retired_fd;
+#endif
+
+    errno_assert (sock != -1); 
+
+    // Set to non-blocking mode.
+#ifdef ZMQ_HAVE_OPENVMS
+    int flags = 1;
+    int rc = ioctl (sock, FIONBIO, &flags);
+    errno_assert (rc != -1);
+#else
+    int flags = fcntl (s, F_GETFL, 0);
+    if (flags == -1)
+        flags = 0;
+    int rc = fcntl (sock, F_SETFL, flags | O_NONBLOCK);
+    errno_assert (rc != -1);
+#endif
+
+    struct sockaddr *sa = (struct sockaddr*) &addr;
+    if (AF_UNIX != sa->sa_family) {
+
+        //  Disable Nagle's algorithm.
+        int flag = 1;
+        rc = setsockopt (sock, IPPROTO_TCP, TCP_NODELAY, (char*) &flag,
+            sizeof (int));
+        errno_assert (rc == 0);
+
+#ifdef ZMQ_HAVE_OPENVMS
+        //  Disable delayed acknowledgements.
+        flag = 1;
+        rc = setsockopt (sock, IPPROTO_TCP, TCP_NODELACK, (char*) &flag,
+            sizeof (int));
+        errno_assert (rc != SOCKET_ERROR);
+#endif
+    }
+
+    return sock;
+}
+
+#endif
diff --git a/src/tcp_listener.hpp b/src/tcp_listener.hpp
new file mode 100644
index 0000000..3b60719
--- /dev/null
+++ b/src/tcp_listener.hpp
@@ -0,0 +1,68 @@
+/*
+    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_TCP_LISTENER_HPP_INCLUDED__
+#define __ZMQ_TCP_LISTENER_HPP_INCLUDED__
+
+#include "fd.hpp"
+#include "ip.hpp"
+
+namespace zmq
+{
+
+    //  The class encapsulating simple TCP listening socket.
+
+    class tcp_listener_t
+    {
+    public:
+
+        tcp_listener_t ();
+        ~tcp_listener_t ();
+
+        //  Start listening on the interface.
+        int set_address (const char *protocol_, const char *addr_);
+
+        //  Close the listening socket.
+        int close ();
+
+        //  Get the file descriptor to poll on to get notified about
+        //  newly created connections.
+        fd_t get_fd ();
+
+        //  Accept the new connection. Returns the file descriptor of the
+        //  newly created connection. The function may return retired_fd
+        //  if the connection was dropped while waiting in the listen backlog.
+        fd_t accept ();
+
+    private:
+
+        //  Address to listen on.
+        sockaddr_storage addr;
+        socklen_t addr_len;
+
+        //  Underlying socket.
+        fd_t s;
+
+        tcp_listener_t (const tcp_listener_t&);
+        void operator = (const tcp_listener_t&);
+    };
+
+}
+
+#endif
diff --git a/src/tcp_socket.cpp b/src/tcp_socket.cpp
new file mode 100644
index 0000000..cc426d7
--- /dev/null
+++ b/src/tcp_socket.cpp
@@ -0,0 +1,226 @@
+/*
+    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 "tcp_socket.hpp"
+#include "platform.hpp"
+#include "err.hpp"
+
+#ifdef ZMQ_HAVE_WINDOWS
+
+zmq::tcp_socket_t::tcp_socket_t () :
+    s (retired_fd)
+{
+}
+
+zmq::tcp_socket_t::~tcp_socket_t ()
+{
+    if (s != retired_fd)
+        close ();
+}
+
+int zmq::tcp_socket_t::open (fd_t fd_, uint64_t sndbuf_, uint64_t rcvbuf_)
+{
+    zmq_assert (s == retired_fd);
+    s = fd_;
+
+    if (sndbuf_) {
+        int sz = (int) sndbuf_;
+        int rc = setsockopt (s, SOL_SOCKET, SO_SNDBUF,
+            (char*) &sz, sizeof (int));
+        errno_assert (rc == 0);
+    }
+
+    if (rcvbuf_) {
+        int sz = (int) rcvbuf_;
+        int rc = setsockopt (s, SOL_SOCKET, SO_RCVBUF,
+            (char*) &sz, sizeof (int));
+        errno_assert (rc == 0);
+    }
+
+    return 0;
+}
+
+int zmq::tcp_socket_t::close ()
+{
+    zmq_assert (s != retired_fd);
+    int rc = closesocket (s);
+    wsa_assert (rc != SOCKET_ERROR);
+    s = retired_fd;
+    return 0;
+}
+
+zmq::fd_t zmq::tcp_socket_t::get_fd ()
+{
+    return s;
+}
+
+int zmq::tcp_socket_t::write (const void *data, int size)
+{
+    int nbytes = send (s, (char*) data, size, 0);
+
+    //  If not a single byte can be written to the socket in non-blocking mode
+    //  we'll get an error (this may happen during the speculative write).
+    if (nbytes == SOCKET_ERROR && WSAGetLastError () == WSAEWOULDBLOCK)
+        return 0;
+		
+    //  Signalise peer failure.
+    if (nbytes == -1 && (
+          WSAGetLastError () == WSAENETDOWN ||
+          WSAGetLastError () == WSAENETRESET ||
+          WSAGetLastError () == WSAEHOSTUNREACH ||
+          WSAGetLastError () == WSAECONNABORTED ||
+          WSAGetLastError () == WSAETIMEDOUT ||
+          WSAGetLastError () == WSAECONNRESET))
+        return -1;
+
+    wsa_assert (nbytes != SOCKET_ERROR);
+
+    return (size_t) nbytes;
+}
+
+int zmq::tcp_socket_t::read (void *data, int size)
+{
+    int nbytes = recv (s, (char*) data, size, 0);
+
+    //  If not a single byte can be read from the socket in non-blocking mode
+    //  we'll get an error (this may happen during the speculative read).
+    if (nbytes == SOCKET_ERROR && WSAGetLastError () == WSAEWOULDBLOCK)
+        return 0;
+
+    //  Connection failure.
+    if (nbytes == -1 && (
+          WSAGetLastError () == WSAENETDOWN ||
+          WSAGetLastError () == WSAENETRESET ||
+          WSAGetLastError () == WSAECONNABORTED ||
+          WSAGetLastError () == WSAETIMEDOUT ||
+          WSAGetLastError () == WSAECONNRESET ||
+          WSAGetLastError () == WSAECONNREFUSED ||
+          WSAGetLastError () == WSAENOTCONN))
+        return -1;
+
+    wsa_assert (nbytes != SOCKET_ERROR);
+
+    //  Orderly shutdown by the other peer.
+    if (nbytes == 0)
+        return -1; 
+
+    return (size_t) nbytes;
+}
+
+#else
+
+#include <unistd.h>
+#include <sys/socket.h>
+#include <arpa/inet.h>
+#include <netinet/tcp.h>
+#include <netinet/in.h>
+#include <netdb.h>
+#include <fcntl.h>
+
+zmq::tcp_socket_t::tcp_socket_t () :
+    s (retired_fd)
+{
+}
+
+zmq::tcp_socket_t::~tcp_socket_t ()
+{
+    if (s != retired_fd)
+        close ();
+}
+
+int zmq::tcp_socket_t::open (fd_t fd_, uint64_t sndbuf_, uint64_t rcvbuf_)
+{
+    assert (s == retired_fd);
+    s = fd_;
+
+    if (sndbuf_) {
+        int sz = (int) sndbuf_;
+        int rc = setsockopt (s, SOL_SOCKET, SO_SNDBUF, &sz, sizeof (int));
+        errno_assert (rc == 0);
+    }
+
+    if (rcvbuf_) {
+        int sz = (int) rcvbuf_;
+        int rc = setsockopt (s, SOL_SOCKET, SO_RCVBUF, &sz, sizeof (int));
+        errno_assert (rc == 0);
+    }
+
+    return 0;
+}
+
+int zmq::tcp_socket_t::close ()
+{
+    zmq_assert (s != retired_fd);
+    int rc = ::close (s);
+    if (rc != 0)
+        return -1;
+    s = retired_fd;
+    return 0;
+}
+
+zmq::fd_t zmq::tcp_socket_t::get_fd ()
+{
+    return s;
+}
+
+int zmq::tcp_socket_t::write (const void *data, int size)
+{
+    ssize_t nbytes = send (s, data, size, 0);
+
+    //  Several errors are OK. When speculative write is being done we may not
+    //  be able to write a single byte to the socket. Also, SIGSTOP issued
+    //  by a debugging tool can result in EINTR error.
+    if (nbytes == -1 && (errno == EAGAIN || errno == EWOULDBLOCK ||
+          errno == EINTR))
+        return 0;
+
+    //  Signalise peer failure.
+    if (nbytes == -1 && (errno == ECONNRESET || errno == EPIPE))
+        return -1;
+
+    errno_assert (nbytes != -1);
+    return (size_t) nbytes;
+}
+
+int zmq::tcp_socket_t::read (void *data, int size)
+{
+    ssize_t nbytes = recv (s, data, size, 0);
+
+    //  Several errors are OK. When speculative read is being done we may not
+    //  be able to read a single byte to the socket. Also, SIGSTOP issued
+    //  by a debugging tool can result in EINTR error.
+    if (nbytes == -1 && (errno == EAGAIN || errno == EWOULDBLOCK ||
+          errno == EINTR))
+        return 0;
+
+    //  Signalise peer failure.
+    if (nbytes == -1 && (errno == ECONNRESET || errno == ECONNREFUSED))
+        return -1;
+
+    errno_assert (nbytes != -1);
+
+    //  Orderly shutdown by the other peer.
+    if (nbytes == 0)
+        return -1;
+
+    return (size_t) nbytes;
+}
+
+#endif
+
diff --git a/src/tcp_socket.hpp b/src/tcp_socket.hpp
new file mode 100644
index 0000000..3aae060
--- /dev/null
+++ b/src/tcp_socket.hpp
@@ -0,0 +1,71 @@
+/*
+    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_TCP_SOCKET_HPP_INCLUDED__
+#define __ZMQ_TCP_SOCKET_HPP_INCLUDED__
+
+#include "fd.hpp"
+#include "stdint.hpp"
+
+namespace zmq
+{
+
+    //  The class encapsulating simple TCP read/write socket.
+
+    class tcp_socket_t
+    {
+    public:
+
+        tcp_socket_t ();
+        ~tcp_socket_t ();
+
+        //  Associates a socket with a native socket descriptor.
+        int open (fd_t fd_, uint64_t sndbuf_, uint64_t rcvbuf_);
+         
+        //  Closes the underlying socket.
+        int close ();
+
+        //  Returns the underlying socket. Returns retired_fd when the socket
+        //  is in the closed state.
+        fd_t get_fd ();
+
+        //  Writes data to the socket. Returns the number of bytes actually
+        //  written (even zero is to be considered to be a success). In case
+        //  of error or orderly shutdown by the other peer -1 is returned.
+        int write (const void *data, int size);
+
+        //  Reads data from the socket (up to 'size' bytes). Returns the number
+        //  of bytes actually read (even zero is to be considered to be
+        //  a success). In case of error or orderly shutdown by the other
+        //  peer -1 is returned.
+        int read (void *data, int size);
+
+    private:
+
+        //  Underlying socket.
+        fd_t s;
+
+        //  Disable copy construction of tcp_socket.
+        tcp_socket_t (const tcp_socket_t&);
+        void operator = (const tcp_socket_t&);
+    };
+
+}
+
+#endif
diff --git a/src/thread.cpp b/src/thread.cpp
new file mode 100644
index 0000000..602ca8b
--- /dev/null
+++ b/src/thread.cpp
@@ -0,0 +1,108 @@
+/*
+    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 "thread.hpp"
+#include "err.hpp"
+#include "platform.hpp"
+
+#ifdef ZMQ_HAVE_WINDOWS
+
+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);
+    win_assert (descriptor != NULL);    
+}
+
+void zmq::thread_t::stop ()
+{
+    DWORD rc = WaitForSingleObject (descriptor, INFINITE);
+    win_assert (rc != WAIT_FAILED);
+}
+
+zmq::thread_t::id_t zmq::thread_t::id ()
+{
+    return GetCurrentThreadId ();
+}
+
+bool zmq::thread_t::equal (id_t id1_, id_t id2_)
+{
+    return id1_ == id2_;
+}
+
+unsigned int __stdcall zmq::thread_t::thread_routine (void *arg_)
+{
+    thread_t *self = (thread_t*) arg_;
+    self->tfn (self->arg);
+    return 0;
+}
+
+#else
+
+#include <signal.h>
+
+void zmq::thread_t::start (thread_fn *tfn_, void *arg_)
+{
+    tfn = tfn_;
+    arg =arg_;
+    int rc = pthread_create (&descriptor, NULL, thread_routine, this);
+    errno_assert (rc == 0);
+}
+
+void zmq::thread_t::stop ()
+{
+    int rc = pthread_join (descriptor, NULL);
+    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
new file mode 100644
index 0000000..432770c
--- /dev/null
+++ b/src/thread.hpp
@@ -0,0 +1,86 @@
+/*
+    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_THREAD_HPP_INCLUDED__
+#define __ZMQ_THREAD_HPP_INCLUDED__
+
+#include "platform.hpp"
+
+#ifdef ZMQ_HAVE_WINDOWS
+#include "windows.hpp"
+#else
+#include <pthread.h>
+#endif
+
+namespace zmq
+{
+
+    typedef void (thread_fn) (void*);
+
+    //  Class encapsulating OS thread. Thread initiation/termination is done
+    //  using special functions rather than in constructor/destructor so that
+    //  thread isn't created during object construction by accident, causing
+    //  newly created thread to access half-initialised object. Same applies
+    //  to the destruction process: Thread should be terminated before object
+    //  destruction begins, otherwise it can access half-destructed object.
+
+    class thread_t
+    {
+    public:
+
+        inline thread_t ()
+        {
+        }
+
+        //  Creates OS thread. 'tfn' is main thread function. It'll be passed
+        //  'arg' as an argument.
+        void start (thread_fn *tfn_, void *arg_);
+
+        //  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_);
+        
+    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&);
+    };
+
+}
+
+#endif
diff --git a/src/upstream.cpp b/src/upstream.cpp
new file mode 100644
index 0000000..1498c31
--- /dev/null
+++ b/src/upstream.cpp
@@ -0,0 +1,98 @@
+/*
+    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 "upstream.hpp"
+#include "err.hpp"
+
+zmq::upstream_t::upstream_t (class app_thread_t *parent_) :
+    socket_base_t (parent_)
+{
+    options.requires_in = true;
+    options.requires_out = false;
+}
+
+zmq::upstream_t::~upstream_t ()
+{
+}
+
+void zmq::upstream_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::upstream_t::xdetach_inpipe (class reader_t *pipe_)
+{
+    zmq_assert (pipe_);
+    fq.detach (pipe_);
+}
+
+void zmq::upstream_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::upstream_t::xkill (class reader_t *pipe_)
+{
+    fq.kill (pipe_);
+}
+
+void zmq::upstream_t::xrevive (class reader_t *pipe_)
+{
+    fq.revive (pipe_);
+}
+
+void zmq::upstream_t::xrevive (class writer_t *pipe_)
+{
+    zmq_assert (false);
+}
+
+int zmq::upstream_t::xsetsockopt (int option_, const void *optval_,
+    size_t optvallen_)
+{
+    //  No special options for this socket type.
+    errno = EINVAL;
+    return -1;
+}
+
+int zmq::upstream_t::xsend (zmq_msg_t *msg_, int flags_)
+{
+    errno = ENOTSUP;
+    return -1;
+}
+
+int zmq::upstream_t::xrecv (zmq_msg_t *msg_, int flags_)
+{
+    return fq.recv (msg_, flags_);
+}
+
+bool zmq::upstream_t::xhas_in ()
+{
+    return fq.has_in ();
+}
+
+bool zmq::upstream_t::xhas_out ()
+{
+    return false;
+}
+
diff --git a/src/upstream.hpp b/src/upstream.hpp
new file mode 100644
index 0000000..5fe42ae
--- /dev/null
+++ b/src/upstream.hpp
@@ -0,0 +1,62 @@
+/*
+    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_UPSTREAM_HPP_INCLUDED__
+#define __ZMQ_UPSTREAM_HPP_INCLUDED__
+
+#include "socket_base.hpp"
+#include "fq.hpp"
+
+namespace zmq
+{
+
+    class upstream_t : public socket_base_t
+    {
+    public:
+
+        upstream_t (class app_thread_t *parent_);
+        ~upstream_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:
+
+        //  Fair queueing object for inbound pipes.
+        fq_t fq;
+
+        upstream_t (const upstream_t&);
+        void operator = (const upstream_t&);
+
+    };
+
+}
+
+#endif
diff --git a/src/uuid.cpp b/src/uuid.cpp
new file mode 100644
index 0000000..406bbb4
--- /dev/null
+++ b/src/uuid.cpp
@@ -0,0 +1,235 @@
+/*
+    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 "uuid.hpp"
+#include "err.hpp"
+
+#if defined ZMQ_HAVE_WINDOWS
+
+zmq::uuid_t::uuid_t ()
+{
+    RPC_STATUS ret = UuidCreate (&uuid);
+    zmq_assert (ret == RPC_S_OK);
+    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 ();
+}
+
+zmq::uuid_t::~uuid_t ()
+{
+}
+
+const char *zmq::uuid_t::to_string ()
+{
+    return (char*) string_buf;
+}
+
+#elif defined ZMQ_HAVE_FREEBSD || defined ZMQ_HAVE_NETBSD
+
+#include <stdlib.h>
+#include <uuid.h>
+
+zmq::uuid_t::uuid_t ()
+{
+    uint32_t status;
+    uuid_create (&uuid, &status);
+    zmq_assert (status == uuid_s_ok);
+    uuid_to_string (&uuid, &string_buf, &status);
+    zmq_assert (status == uuid_s_ok);
+
+    create_blob ();
+}
+
+zmq::uuid_t::~uuid_t ()
+{
+    free (string_buf);
+}
+
+const char *zmq::uuid_t::to_string ()
+{
+    return string_buf;
+}
+
+#elif defined ZMQ_HAVE_LINUX || defined ZMQ_HAVE_SOLARIS ||\
+      defined ZMQ_HAVE_OSX || defined ZMQ_HAVE_CYGWIN
+
+#include <uuid/uuid.h>
+
+zmq::uuid_t::uuid_t ()
+{
+    uuid_generate (uuid);
+    uuid_unparse (uuid, string_buf);
+
+    create_blob ();
+}
+
+zmq::uuid_t::~uuid_t ()
+{
+}
+
+const char *zmq::uuid_t::to_string ()
+{
+    return string_buf;
+}
+
+#elif defined ZMQ_HAVE_OPENVMS
+
+#include <starlet.h>
+
+#define uuid_generate(x) sys$create_uid(&(x))
+
+#define uuid_unparse(x, y) \
+        sprintf (y, "%08x-%04x-%04x-%02x%02x-%02x%02x%02x%02x%02x%02x", \
+                        x.data0, x.data1, x.data2, \
+                        x.data3 [0], x.data3 [1], \
+                        x.data3 [2], x.data3 [3], \
+                        x.data3 [4], x.data3 [5], \
+                        x.data3 [6], x.data3 [7]);
+
+zmq::uuid_t::uuid_t ()
+{
+    uuid_generate (uuid);
+    uuid_unparse (uuid, string_buf);
+}
+
+zmq::uuid_t::~uuid_t ()
+{
+}
+
+const char *zmq::uuid_t::to_string ()
+{
+    return string_buf;
+}
+
+#else
+
+#include <stdio.h>
+#include <string.h>
+#include <openssl/rand.h>
+
+zmq::uuid_t::uuid_t ()
+{
+    unsigned char rand_buf [16];
+    int ret = RAND_bytes (rand_buf, sizeof rand_buf);
+    zmq_assert (ret == 1);
+
+    //  Read in UUID fields.
+    memcpy (&time_low, rand_buf, sizeof time_low);
+    memcpy (&time_mid, rand_buf + 4, sizeof time_mid);
+    memcpy (&time_hi_and_version, rand_buf + 6, sizeof time_hi_and_version);
+    memcpy (&clock_seq_hi_and_reserved, rand_buf + 8,
+        sizeof clock_seq_hi_and_reserved);
+    memcpy (&clock_seq_low, rand_buf + 9, sizeof clock_seq_low);
+    memcpy (&node [0], rand_buf + 10, sizeof node);
+
+    //  Store UUID version number.
+    time_hi_and_version = (time_hi_and_version & 0x0fff) | 4 << 12;
+
+    //  Store UUID type.
+    clock_seq_hi_and_reserved = (clock_seq_hi_and_reserved & 0x3f) | 0x80;
+
+    snprintf (string_buf, sizeof string_buf,
+        "%08x-%04x-%04x-%02x%02x-%02x%02x%02x%02x%02x%02x",
+        time_low,
+        time_mid,
+        time_hi_and_version,
+        clock_seq_hi_and_reserved,
+        clock_seq_low,
+        node [0], node [1], node [2], node [3], node [4], node [5]);
+
+    create_blob ();
+}
+
+zmq::uuid_t::~uuid_t ()
+{
+}
+
+const char *zmq::uuid_t::to_string ()
+{
+    return string_buf;
+}
+
+#endif
+
+const unsigned char *zmq::uuid_t::to_blob ()
+{
+    return blob_buf;
+}
+
+unsigned char zmq::uuid_t::convert_byte (const char *hexa_)
+{
+    unsigned char byte;
+
+    if (*hexa_ >= '0' && *hexa_ <= '9')
+        byte = *hexa_ - '0';
+    else if (*hexa_ >= 'A' && *hexa_ <= 'F')
+        byte = *hexa_ - 'A' + 10;
+    else if (*hexa_ >= 'a' && *hexa_ <= 'f')
+        byte = *hexa_ - 'a' + 10;
+    else
+        zmq_assert (false);
+
+    byte *= 16;
+
+    hexa_++;
+    if (*hexa_ >= '0' && *hexa_ <= '9')
+        byte += *hexa_ - '0';
+    else if (*hexa_ >= 'A' && *hexa_ <= 'F')
+        byte += *hexa_ - 'A' + 10;
+    else if (*hexa_ >= 'a' && *hexa_ <= 'f')
+        byte += *hexa_ - 'a' + 10;
+    else
+        zmq_assert (false);  
+
+    return byte;
+}
+
+void zmq::uuid_t::create_blob ()
+{
+    const char *buf = (const char*) string_buf;
+
+    blob_buf [0] = convert_byte (buf + 0);
+    blob_buf [1] = convert_byte (buf + 2);
+    blob_buf [2] = convert_byte (buf + 4);
+    blob_buf [3] = convert_byte (buf + 6);
+
+    blob_buf [4] = convert_byte (buf + 9);
+    blob_buf [5] = convert_byte (buf + 11);
+
+    blob_buf [6] = convert_byte (buf + 14);
+    blob_buf [7] = convert_byte (buf + 16);
+
+    blob_buf [8] = convert_byte (buf + 19);
+    blob_buf [9] = convert_byte (buf + 21);
+
+    blob_buf [10] = convert_byte (buf + 24);
+    blob_buf [11] = convert_byte (buf + 26);
+    blob_buf [12] = convert_byte (buf + 28);
+    blob_buf [13] = convert_byte (buf + 30);
+    blob_buf [14] = convert_byte (buf + 32);
+    blob_buf [15] = convert_byte (buf + 34);
+}
diff --git a/src/uuid.hpp b/src/uuid.hpp
new file mode 100644
index 0000000..871f827
--- /dev/null
+++ b/src/uuid.hpp
@@ -0,0 +1,110 @@
+/*
+    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_UUID_HPP_INCLUDED__
+#define __ZMQ_UUID_HPP_INCLUDED__
+
+#include "platform.hpp"
+#include "stdint.hpp"
+
+#if defined ZMQ_HAVE_FREEBSD || defined ZMQ_HAVE_NETBSD
+#include <uuid.h>
+#elif defined ZMQ_HAVE_LINUX || defined ZMQ_HAVE_SOLARIS ||\
+      defined ZMQ_HAVE_OSX || defined ZMQ_HAVE_CYGWIN
+#include <uuid/uuid.h>
+#elif defined ZMQ_HAVE_WINDOWS
+#include "windows.hpp"
+#include <rpc.h>
+#elif defined ZMQ_HAVE_OPENVMS
+typedef struct
+{
+    unsigned long data0;
+    unsigned short data1;
+    unsigned short data2;
+    unsigned char data3 [8];
+} uuid_t;
+#endif
+
+namespace zmq
+{
+
+    //  This class provides RFC 4122 (a Universally Unique IDentifier)
+    //  implementation.
+
+    class uuid_t
+    {
+    public:
+
+        uuid_t ();
+        ~uuid_t ();
+
+        //  The length of textual representation of UUID.
+        enum { uuid_string_len = 36 };
+
+        //  Returns a pointer to buffer containing the textual
+        //  representation of the UUID. The caller is reponsible to
+        //  free the allocated memory.
+        const char *to_string ();
+
+        //  The length of binary representation of UUID.
+        enum { uuid_blob_len = 16 };
+
+        const unsigned char *to_blob ();
+
+    private:
+
+        //  Converts one byte from hexa representation to binary.
+        unsigned char convert_byte (const char *hexa_);
+
+        //  Converts string representation of UUID into standardised BLOB.
+        //  The function is endianness agnostic.
+        void create_blob ();
+
+#if defined ZMQ_HAVE_WINDOWS
+#ifdef ZMQ_HAVE_MINGW32
+        typedef unsigned char* RPC_CSTR;
+#endif
+        ::UUID uuid;
+        RPC_CSTR string_buf;
+#elif defined ZMQ_HAVE_FREEBSD || defined ZMQ_HAVE_NETBSD
+        ::uuid_t uuid;
+        char *string_buf;
+#elif defined ZMQ_HAVE_LINUX || defined ZMQ_HAVE_SOLARIS ||\
+      defined ZMQ_HAVE_OSX || defined ZMQ_HAVE_CYGWIN ||\
+      defined ZMQ_HAVE_OPENVMS
+        ::uuid_t uuid;
+        char string_buf [uuid_string_len + 1];
+#else
+        //  RFC 4122 UUID's fields
+        uint32_t time_low;
+        uint16_t time_mid;
+        uint16_t time_hi_and_version;
+        uint8_t clock_seq_hi_and_reserved;
+        uint8_t clock_seq_low;
+        uint8_t node [6];
+
+        char string_buf [uuid_string_len + 1];
+#endif
+
+        unsigned char blob_buf [uuid_blob_len];
+    };
+
+}
+
+#endif
diff --git a/src/windows.hpp b/src/windows.hpp
new file mode 100644
index 0000000..8fc98b0
--- /dev/null
+++ b/src/windows.hpp
@@ -0,0 +1,78 @@
+/*
+    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_WINDOWS_HPP_INCLUDED__
+#define __ZMQ_WINDOWS_HPP_INCLUDED__
+
+// The purpose of this header file is to turn on only the items actually needed
+// on the windows platform.
+
+#define _WINSOCKAPI_
+#ifndef NOMINMAX
+#define NOMINMAX // No min and max functions, these clash with C++.
+#endif
+#define _CRT_SECURE_NO_WARNINGS
+
+#ifndef WIN32_LEAN_AND_MEAN
+#define WIN32_LEAN_AND_MEAN
+#endif
+#ifndef NOUSER  //  No USER defines and routines.
+#define NOUSER
+#endif
+#ifndef NOMCX   //  No Modem Configuration Extensions.
+#define NOMCX
+#endif
+#ifndef NOIME   //  No Input Method Editor.
+#define NOIME
+#endif
+#ifndef NOSOUND //  No Sound driver routines.
+#define NOSOUND
+#endif
+
+#ifdef ZMQ_HAVE_MINGW32
+#ifdef WINVER
+#undef WINVER
+#endif
+#define WINVER 0x0501
+#endif
+
+#include <windows.h>
+
+//  MSVC++ 2005 on Win2000 does not define _WIN32_WINNT.
+#ifndef _WIN32_WINNT
+#define _WIN32_WINNT WINVER
+#endif
+
+//  Enable winsock (not included when WIN32_LEAN_AND_MEAN is defined).
+#if(_WIN32_WINNT >= 0x0400)
+#include <winsock2.h>
+#include <mswsock.h>
+#else
+#include <winsock.h>
+#endif
+
+#include <ws2tcpip.h>
+#include <ipexport.h>
+#include <process.h>
+
+//  On mingw environment AI_NUMERICSERV is not defined, needed in ip.cpp.
+#ifndef AI_NUMERICSERV
+#define AI_NUMERICSERV 0x0400
+#endif
+#endif
diff --git a/src/wire.hpp b/src/wire.hpp
new file mode 100644
index 0000000..9534cf6
--- /dev/null
+++ b/src/wire.hpp
@@ -0,0 +1,98 @@
+/*
+    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_WIRE_HPP_INCLUDED__
+#define __ZMQ_WIRE_HPP_INCLUDED__
+
+#include "stdint.hpp"
+
+namespace zmq
+{
+
+    //  Helper functions to convert different integer types to/from network
+    //  byte order.
+
+    inline void put_uint8 (unsigned char *buffer_, uint8_t value)
+    {
+        *buffer_ = value;
+    }
+
+    inline uint8_t get_uint8 (unsigned char *buffer_)
+    {
+        return *buffer_;
+    }
+
+    inline void put_uint16 (unsigned char *buffer_, uint16_t value)
+    {
+        buffer_ [0] = (unsigned char) (((value) >> 8) & 0xff);
+        buffer_ [1] = (unsigned char) (value & 0xff);
+    }
+
+    inline uint16_t get_uint16 (unsigned char *buffer_)
+    {
+        return
+            (((uint16_t) buffer_ [0]) << 8) |
+            ((uint16_t) buffer_ [1]);
+    }
+
+    inline void put_uint32 (unsigned char *buffer_, uint32_t value)
+    {
+        buffer_ [0] = (unsigned char) (((value) >> 24) & 0xff);
+        buffer_ [1] = (unsigned char) (((value) >> 16) & 0xff);
+        buffer_ [2] = (unsigned char) (((value) >> 8) & 0xff);
+        buffer_ [3] = (unsigned char) (value & 0xff);
+    }
+
+    inline uint32_t get_uint32 (unsigned char *buffer_)
+    {
+        return
+            (((uint32_t) buffer_ [0]) << 24) |
+            (((uint32_t) buffer_ [1]) << 16) |
+            (((uint32_t) buffer_ [2]) << 8) |
+            ((uint32_t) buffer_ [3]);
+    }
+
+    inline void put_uint64 (unsigned char *buffer_, uint64_t value)
+    {
+        buffer_ [0] = (unsigned char) (((value) >> 56) & 0xff);
+        buffer_ [1] = (unsigned char) (((value) >> 48) & 0xff);
+        buffer_ [2] = (unsigned char) (((value) >> 40) & 0xff);
+        buffer_ [3] = (unsigned char) (((value) >> 32) & 0xff);
+        buffer_ [4] = (unsigned char) (((value) >> 24) & 0xff);
+        buffer_ [5] = (unsigned char) (((value) >> 16) & 0xff);
+        buffer_ [6] = (unsigned char) (((value) >> 8) & 0xff);
+        buffer_ [7] = (unsigned char) (value & 0xff);
+    }
+
+    inline uint64_t get_uint64 (unsigned char *buffer_)
+    {
+        return
+            (((uint64_t) buffer_ [0]) << 56) |
+            (((uint64_t) buffer_ [1]) << 48) |
+            (((uint64_t) buffer_ [2]) << 40) |
+            (((uint64_t) buffer_ [3]) << 32) |
+            (((uint64_t) buffer_ [4]) << 24) |
+            (((uint64_t) buffer_ [5]) << 16) |
+            (((uint64_t) buffer_ [6]) << 8) |
+            ((uint64_t) buffer_ [7]);
+    }
+
+}
+
+#endif
diff --git a/src/xrep.cpp b/src/xrep.cpp
new file mode 100644
index 0000000..4e8d18a
--- /dev/null
+++ b/src/xrep.cpp
@@ -0,0 +1,271 @@
+/*
+    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 "xrep.hpp"
+#include "err.hpp"
+#include "pipe.hpp"
+
+zmq::xrep_t::xrep_t (class app_thread_t *parent_) :
+    socket_base_t (parent_),
+    current_in (0),
+    more_in (false),
+    current_out (NULL),
+    more_out (false)
+{
+    options.requires_in = true;
+    options.requires_out = true;
+
+    //  On connect, pipes are created only after initial handshaking.
+    //  That way we are aware of the peer's identity when binding to the pipes.
+    options.immediate_connect = false;
+}
+
+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 ();
+}
+
+void zmq::xrep_t::xattach_pipes (class reader_t *inpipe_,
+    class writer_t *outpipe_, const blob_t &peer_identity_)
+{
+    zmq_assert (inpipe_ && outpipe_);
+
+    //  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);
+
+    inpipe_t inpipe = {inpipe_, peer_identity_, true};
+    inpipes.push_back (inpipe);
+}
+
+void zmq::xrep_t::xdetach_inpipe (class reader_t *pipe_)
+{
+// TODO:!
+    for (inpipes_t::iterator it = inpipes.begin (); it != inpipes.end ();
+          it++) {
+        if (it->reader == pipe_) {
+            inpipes.erase (it);
+            return;
+        }
+    }
+    zmq_assert (false);
+}
+
+void zmq::xrep_t::xdetach_outpipe (class writer_t *pipe_)
+{
+    for (outpipes_t::iterator it = outpipes.begin ();
+          it != outpipes.end (); ++it) {
+        if (it->second.writer == pipe_) {
+            outpipes.erase (it);
+            if (pipe_ == current_out)
+                current_out = NULL;
+            return;
+        }
+    }
+    zmq_assert (false);
+}
+
+void zmq::xrep_t::xkill (class 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_)
+{
+    for (inpipes_t::iterator it = inpipes.begin (); it != inpipes.end ();
+          it++) {
+        if (it->reader == pipe_) {
+            zmq_assert (!it->active);
+            it->active = true;
+            return;
+        }
+    }
+    zmq_assert (false);
+}
+
+void zmq::xrep_t::xrevive (class writer_t *pipe_)
+{
+    for (outpipes_t::iterator it = outpipes.begin ();
+          it != outpipes.end (); ++it) {
+        if (it->second.writer == pipe_) {
+            zmq_assert (!it->second.active);
+            it->second.active = true;
+            return;
+        }
+    }
+    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
+    //  peer to send the message to.
+    if (!more_out) {
+        zmq_assert (!current_out);
+
+        //  There's no such thing as prefix with no subsequent message.
+        zmq_assert (msg_->flags & ZMQ_MSG_MORE);
+        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;
+
+        return 0;
+    }
+
+    //  Check whether this is the last part of the message.
+    more_out = msg_->flags & ZMQ_MSG_MORE;
+
+    //  Push the message into the pipe. If there's no out pipe, just drop it.
+    if (current_out) {
+        bool ok = current_out->write (msg_);
+        zmq_assert (ok);
+        if (!more_out) {
+            current_out->flush ();
+            current_out = NULL;
+        }
+    }
+    else {
+        int rc = zmq_msg_close (msg_);
+        zmq_assert (rc == 0);
+    }
+
+    //  Detach the message from the data buffer.
+    int rc = zmq_msg_init (msg_);
+    zmq_assert (rc == 0);
+
+    return 0;
+}
+
+int zmq::xrep_t::xrecv (zmq_msg_t *msg_, int flags_)
+{
+    //  Deallocate old content of the message.
+    zmq_msg_close (msg_);
+
+    //  If we are in the middle of reading a message, just grab next part of it.
+    if (more_in) {
+        zmq_assert (inpipes [current_in].active);
+        bool fetched = inpipes [current_in].reader->read (msg_);
+        zmq_assert (fetched);
+        more_in = msg_->flags & ZMQ_MSG_MORE;
+        if (!more_in) {
+            current_in++;
+            if (current_in >= inpipes.size ())
+                current_in = 0;
+        }
+        return 0;
+    }
+
+    //  Round-robin over the pipes to get the next message.
+    for (int count = inpipes.size (); count != 0; count--) {
+
+        //  Try to fetch new message.
+        bool fetched;
+        if (!inpipes [current_in].active)
+            fetched = false;
+        else
+            fetched = inpipes [current_in].reader->check_read ();
+
+        //  If we have a message, create a prefix and return it to the caller.
+        if (fetched) {
+            int rc = zmq_msg_init_size (msg_,
+                inpipes [current_in].identity.size ());
+            zmq_assert (rc == 0);
+            memcpy (zmq_msg_data (msg_), inpipes [current_in].identity.data (),
+                zmq_msg_size (msg_));
+            msg_->flags = ZMQ_MSG_MORE;
+            more_in = true;
+            return 0;
+        }
+
+        //  If me don't have a message, move to next pipe.
+        current_in++;
+        if (current_in >= inpipes.size ())
+            current_in = 0;
+    }
+
+    //  No message is available. Initialise the output parameter
+    //  to be a 0-byte message.
+    zmq_msg_init (msg_);
+    errno = EAGAIN;
+    return -1;
+}
+
+bool zmq::xrep_t::xhas_in ()
+{
+    //  There are subsequent parts of the partly-read message available.
+    if (more_in)
+        return true;
+
+    //  Note that messing with current doesn't break the fairness of fair
+    //  queueing algorithm. If there are no messages available current will
+    //  get back to its original value. Otherwise it'll point to the first
+    //  pipe holding messages, skipping only pipes with no messages available.
+    for (int count = inpipes.size (); count != 0; count--) {
+        if (inpipes [current_in].active &&
+              inpipes [current_in].reader->check_read ())
+            return true;
+        current_in++;
+        if (current_in >= inpipes.size ())
+            current_in = 0;
+    }
+
+    return false;
+}
+
+bool zmq::xrep_t::xhas_out ()
+{
+    //  In theory, XREP socket is always ready for writing. Whether actual
+    //  attempt to write succeeds depends on whitch pipe the message is going
+    //  to be routed to.
+    return true;
+}
+
+
diff --git a/src/xrep.hpp b/src/xrep.hpp
new file mode 100644
index 0000000..940d288
--- /dev/null
+++ b/src/xrep.hpp
@@ -0,0 +1,95 @@
+/*
+    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_XREP_HPP_INCLUDED__
+#define __ZMQ_XREP_HPP_INCLUDED__
+
+#include <map>
+#include <vector>
+
+#include "socket_base.hpp"
+#include "blob.hpp"
+
+namespace zmq
+{
+
+    //  TODO: This class uses O(n) scheduling. Rewrite it to use O(1) algorithm.
+    class xrep_t : public socket_base_t
+    {
+    public:
+
+        xrep_t (class app_thread_t *parent_);
+        ~xrep_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:
+
+        struct inpipe_t
+        {
+            class reader_t *reader;
+            blob_t identity;
+            bool active;
+        };
+
+        //  Inbound pipes with the names of corresponging peers.
+        typedef std::vector <inpipe_t> inpipes_t;
+        inpipes_t inpipes;
+
+        //  The pipe we are currently reading from.
+        inpipes_t::size_type current_in;
+
+        //  If true, more incoming message parts are expected.
+        bool more_in;
+
+        struct outpipe_t
+        {
+            class writer_t *writer;
+            bool active;
+        };
+
+        //  Outbound pipes indexed by the peer names.
+        typedef std::map <blob_t, outpipe_t> outpipes_t;
+        outpipes_t outpipes;
+
+        //  The pipe we are currently writing to.
+        class writer_t *current_out;
+
+        //  If true, more outgoing message parts are expected.
+        bool more_out;
+
+        xrep_t (const xrep_t&);
+        void operator = (const xrep_t&);
+    };
+
+}
+
+#endif
diff --git a/src/xreq.cpp b/src/xreq.cpp
new file mode 100644
index 0000000..ab90f68
--- /dev/null
+++ b/src/xreq.cpp
@@ -0,0 +1,118 @@
+/*
+    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 "xreq.hpp"
+#include "err.hpp"
+
+zmq::xreq_t::xreq_t (class app_thread_t *parent_) :
+    socket_base_t (parent_),
+    dropping (false)
+{
+    options.requires_in = true;
+    options.requires_out = true;
+}
+
+zmq::xreq_t::~xreq_t ()
+{
+}
+
+void zmq::xreq_t::xattach_pipes (class reader_t *inpipe_,
+    class writer_t *outpipe_, const blob_t &peer_identity_)
+{
+    zmq_assert (inpipe_ && outpipe_);
+    fq.attach (inpipe_);
+    lb.attach (outpipe_);
+}
+
+void zmq::xreq_t::xdetach_inpipe (class reader_t *pipe_)
+{
+    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;
+}
+
+int zmq::xreq_t::xsend (zmq_msg_t *msg_, int flags_)
+{
+    while (true) {
+
+        //  If we are ignoring the current message, just drop it and return.
+        if (dropping) {
+            if (!(msg_->flags & ZMQ_MSG_MORE))
+                dropping = false;
+            int rc = zmq_msg_close (msg_);
+            zmq_assert (rc == 0);
+            rc = zmq_msg_init (msg_);
+            zmq_assert (rc == 0);
+            return 0;
+        }
+
+        int rc = lb.send (msg_, flags_);
+        if (rc != 0 && errno == EAGAIN)
+            dropping = true;
+        else
+            return rc;
+    }
+}
+
+int zmq::xreq_t::xrecv (zmq_msg_t *msg_, int flags_)
+{
+    return fq.recv (msg_, flags_);
+}
+
+bool zmq::xreq_t::xhas_in ()
+{
+    return fq.has_in ();
+}
+
+bool zmq::xreq_t::xhas_out ()
+{
+    //  Socket is always ready for writing. When the queue is full, message
+    //  will be silently dropped.
+    return true;
+}
+
diff --git a/src/xreq.hpp b/src/xreq.hpp
new file mode 100644
index 0000000..25a97f1
--- /dev/null
+++ b/src/xreq.hpp
@@ -0,0 +1,67 @@
+/*
+    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_XREQ_HPP_INCLUDED__
+#define __ZMQ_XREQ_HPP_INCLUDED__
+
+#include "socket_base.hpp"
+#include "fq.hpp"
+#include "lb.hpp"
+
+namespace zmq
+{
+
+    class xreq_t : public socket_base_t
+    {
+    public:
+
+        xreq_t (class app_thread_t *parent_);
+        ~xreq_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:
+
+        //  Messages are fair-queued from inbound pipes. And load-balanced to
+        //  the outbound pipes.
+        fq_t fq;
+        lb_t lb;
+
+        //  If true, curently sent message is being dropped.
+        bool dropping;
+
+        xreq_t (const xreq_t&);
+        void operator = (const xreq_t&);
+    };
+
+}
+
+#endif
diff --git a/src/yarray.hpp b/src/yarray.hpp
new file mode 100644
index 0000000..8c79b99
--- /dev/null
+++ b/src/yarray.hpp
@@ -0,0 +1,110 @@
+/*
+    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_INCLUDED__
+#define __ZMQ_YARRAY_INCLUDED__
+
+#include <vector>
+#include <algorithm>
+
+namespace zmq
+{
+
+    //  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.
+
+    template <typename T> class yarray_t
+    {
+    public:
+
+        typedef typename std::vector <T*>::size_type size_type;
+
+        inline yarray_t ()
+        {
+        }
+
+        inline ~yarray_t ()
+        {
+        }
+
+        inline size_type size ()
+        {
+            return items.size ();
+        }
+
+        inline bool empty ()
+        {
+            return items.empty ();
+        }
+
+        inline T *&operator [] (size_type index_)
+        {
+            return items [index_];
+        }
+
+        inline void push_back (T *item_)
+        {
+            if (item_)
+                item_->set_yarray_index (items.size ());
+            items.push_back (item_);
+        }
+
+        inline void erase (T *item_) {
+            erase (item_->get_yarray_index ());
+        }
+
+        inline void erase (size_type index_) {
+            if (items.back ())
+                items.back ()->set_yarray_index (index_);
+            items [index_] = items.back ();
+            items.pop_back ();
+        }
+
+        inline void swap (size_type index1_, size_type index2_)
+        {
+            if (items [index1_])
+                items [index1_]->set_yarray_index (index2_);
+            if (items [index2_])
+                items [index2_]->set_yarray_index (index1_);
+            std::swap (items [index1_], items [index2_]);
+        }
+
+        inline void clear ()
+        {
+            items.clear ();
+        }
+
+        inline size_type index (T *item_)
+        {
+            return (size_type) item_->get_yarray_index ();
+        }
+
+    private:
+
+        typedef std::vector <T*> items_t;
+        items_t items;
+
+        yarray_t (const yarray_t&);
+        void operator = (const yarray_t&);
+    };
+
+}
+
+#endif
diff --git a/src/yarray_item.hpp b/src/yarray_item.hpp
new file mode 100644
index 0000000..b6d89cc
--- /dev/null
+++ b/src/yarray_item.hpp
@@ -0,0 +1,62 @@
+/*
+    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)
+        {
+        }
+
+        inline ~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
new file mode 100644
index 0000000..df5b3d0
--- /dev/null
+++ b/src/ypipe.hpp
@@ -0,0 +1,191 @@
+/*
+    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_YPIPE_HPP_INCLUDED__
+#define __ZMQ_YPIPE_HPP_INCLUDED__
+
+#include "atomic_ptr.hpp"
+#include "yqueue.hpp"
+#include "platform.hpp"
+
+namespace zmq
+{
+
+    //  Lock-free queue implementation.
+    //  Only a single thread can read from the pipe at any specific moment.
+    //  Only a single thread can write to the pipe at any specific moment.
+    //  T is the type of the object in the queue.
+    //  N is granularity of the pipe, i.e. how many items are needed to
+    //  perform next memory allocation.
+
+    template <typename T, int N> class ypipe_t
+    {
+    public:
+
+        //  Initialises the pipe.
+        inline ypipe_t ()
+        {
+            //  Insert terminator element into the queue.
+            queue.push ();
+
+            //  Let all the pointers to point to the terminator.
+            //  (unless pipe is dead, in which case c is set to NULL).
+            r = w = f = &queue.back ();
+            c.set (&queue.back ());
+        }
+
+        //  Following function (write) deliberately copies uninitialised data
+        //  when used with zmq_msg. Initialising the VSM body for
+        //  non-VSM messages won't be good for performance.
+
+#ifdef ZMQ_HAVE_OPENVMS
+#pragma message save
+#pragma message disable(UNINIT)
+#endif
+
+        //  Write an item to the pipe.  Don't flush it yet. If incomplete is
+        //  set to true the item is assumed to be continued by items
+        //  subsequently written to the pipe. Incomplete items are never
+        //  flushed down the stream.
+        inline void write (const T &value_, bool incomplete_)
+        {
+            //  Place the value to the queue, add new terminator element.
+            queue.back () = value_;
+            queue.push ();
+
+            //  Move the "flush up to here" poiter.
+            if (!incomplete_)
+                f = &queue.back ();
+        }
+
+#ifdef ZMQ_HAVE_OPENVMS
+#pragma message restore
+#endif
+
+        //  Pop an incomplete item from the pipe. Returns true is such
+        //  item exists, false otherwise.
+        inline bool unwrite (T *value_)
+        {
+            if (f == &queue.back ())
+                return false;
+            queue.unpush ();
+            *value_ = queue.back ();
+            return true;
+        }
+
+        //  Flush all the completed items into the pipe. Returns false if
+        //  the reader thread is sleeping. In that case, caller is obliged to
+        //  wake the reader up before using the pipe again.
+        inline bool flush ()
+        {
+            //  If there are no un-flushed items, do nothing.
+            if (w == f)
+                return true;
+
+            //  Try to set 'c' to 'f'.
+            if (c.cas (w, f) != w) {
+
+                //  Compare-and-swap was unseccessful because 'c' is NULL.
+                //  This means that the reader is asleep. Therefore we don't
+                //  care about thread-safeness and update c in non-atomic
+                //  manner. We'll return false to let the caller know
+                //  that reader is sleeping.
+                c.set (f);
+                w = f;
+                return false;
+            }
+
+            //  Reader is alive. Nothing special to do now. Just move
+            //  the 'first un-flushed item' pointer to 'f'.
+            w = f;
+            return true;
+        }
+
+        //  Check whether item is available for reading.
+        inline bool check_read ()
+        {
+            //  Was the value prefetched already? If so, return.
+            if (&queue.front () != r)
+                 return true;
+
+            //  There's no prefetched value, so let us prefetch more values.
+            //  Prefetching is to simply retrieve the
+            //  pointer from c in atomic fashion. If there are no
+            //  items to prefetch, set c to NULL (using compare-and-swap).
+            r = c.cas (&queue.front (), NULL);
+
+            //  If there are no elements prefetched, exit.
+            //  During pipe's lifetime r should never be NULL, however,
+            //  it can happen during pipe shutdown when items
+            //  are being deallocated.
+            if (&queue.front () == r || !r)
+                return false;
+
+            //  There was at least one value prefetched.
+            return true;
+        }
+
+        //  Reads an item from the pipe. Returns false if there is no value.
+        //  available.
+        inline bool read (T *value_)
+        {
+            //  Try to prefetch a value.
+            if (!check_read ())
+                return false;
+
+            //  There was at least one value prefetched.
+            //  Return it to the caller.
+            *value_ = queue.front ();
+            queue.pop ();
+            return true;
+        }
+
+    protected:
+
+        //  Allocation-efficient queue to store pipe items.
+        //  Front of the queue points to the first prefetched item, back of
+        //  the pipe points to last un-flushed item. Front is used only by
+        //  reader thread, while back is used only by writer thread.
+        yqueue_t <T, N> queue;
+
+        //  Points to the first un-flushed item. This variable is used
+        //  exclusively by writer thread.
+        T *w;
+
+        //  Points to the first un-prefetched item. This variable is used
+        //  exclusively by reader thread.
+        T *r;
+
+        //  Points to the first item to be flushed in the future.
+        T *f;
+
+        //  The single point of contention between writer and reader thread.
+        //  Points past the last flushed item. If it is NULL,
+        //  reader is asleep. This pointer should be always accessed using
+        //  atomic operations.
+        atomic_ptr_t <T> c;
+
+        //  Disable copying of ypipe object.
+        ypipe_t (const ypipe_t&);
+        void operator = (const ypipe_t&);
+    };
+
+}
+
+#endif
diff --git a/src/yqueue.hpp b/src/yqueue.hpp
new file mode 100644
index 0000000..9eaceb5
--- /dev/null
+++ b/src/yqueue.hpp
@@ -0,0 +1,197 @@
+/*
+    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_YQUEUE_HPP_INCLUDED__
+#define __ZMQ_YQUEUE_HPP_INCLUDED__
+
+#include <stdlib.h>
+#include <stddef.h>
+
+#include "err.hpp"
+#include "atomic_ptr.hpp"
+
+namespace zmq
+{
+
+    //  yqueue is an efficient queue implementation. The main goal is
+    //  to minimise number of allocations/deallocations needed. Thus yqueue
+    //  allocates/deallocates elements in batches of N.
+    //
+    //  yqueue allows one thread to use push/back function and another one 
+    //  to use pop/front functions. However, user must ensure that there's no
+    //  pop on the empty queue and that both threads don't access the same
+    //  element in unsynchronised manner.
+    //
+    //  T is the type of the object in the queue.
+    //  N is granularity of the queue (how many pushes have to be done till
+    //  actual memory allocation is required).
+
+    template <typename T, int N> class yqueue_t
+    {
+    public:
+
+        //  Create the queue.
+        inline yqueue_t ()
+        {
+             begin_chunk = (chunk_t*) malloc (sizeof (chunk_t));
+             zmq_assert (begin_chunk);
+             begin_pos = 0;
+             back_chunk = NULL;
+             back_pos = 0;
+             end_chunk = begin_chunk;
+             end_pos = 0;
+        }
+
+        //  Destroy the queue.
+        inline ~yqueue_t ()
+        {
+            while (true) {
+                if (begin_chunk == end_chunk) {
+                    free (begin_chunk);
+                    break;
+                } 
+                chunk_t *o = begin_chunk;
+                begin_chunk = begin_chunk->next;
+                free (o);
+            }
+
+            chunk_t *sc = spare_chunk.xchg (NULL);
+            if (sc)
+                free (sc);
+        }
+
+        //  Returns reference to the front element of the queue.
+        //  If the queue is empty, behaviour is undefined.
+        inline T &front ()
+        {
+             return begin_chunk->values [begin_pos];
+        }
+
+        //  Returns reference to the back element of the queue.
+        //  If the queue is empty, behaviour is undefined.
+        inline T &back ()
+        {
+            return back_chunk->values [back_pos];
+        }
+
+        //  Adds an element to the back end of the queue.
+        inline void push ()
+        {
+            back_chunk = end_chunk;
+            back_pos = end_pos;
+
+            if (++end_pos != N)
+                return;
+
+            chunk_t *sc = spare_chunk.xchg (NULL);
+            if (sc) {
+                end_chunk->next = sc;
+                sc->prev = end_chunk;
+            } else {
+                end_chunk->next = (chunk_t*) malloc (sizeof (chunk_t));
+                zmq_assert (end_chunk->next);
+                end_chunk->next->prev = end_chunk;
+            }
+            end_chunk = end_chunk->next;
+            end_pos = 0;
+        }
+
+        //  Removes element from the back end of the queue. In other words
+        //  it rollbacks last push to the queue. Take care: Caller is
+        //  responsible for destroying the object being unpushed.
+        //  The caller must also guarantee that the queue isn't empty when
+        //  unpush is called. It cannot be done automatically as the read
+        //  side of the queue can be managed by different, completely
+        //  unsynchronised thread.
+        inline void unpush ()
+        {
+            //  First, move 'back' one position backwards.
+            if (back_pos)
+                --back_pos;
+            else {
+                back_pos = N - 1;
+                back_chunk = back_chunk->prev;
+            }
+
+            //  Now, move 'end' position backwards. Note that obsolete end chunk
+            //  is not used as a spare chunk. The analysis shows that doing so
+            //  would require free and atomic operation per chunk deallocated
+            //  instead of a simple free.
+            if (end_pos)
+                --end_pos;
+            else {
+                end_pos = N - 1;
+                end_chunk = end_chunk->prev;
+                free (end_chunk->next);
+                end_chunk->next = NULL;
+            }
+        }
+
+        //  Removes an element from the front end of the queue.
+        inline void pop ()
+        {
+            if (++ begin_pos == N) {
+                chunk_t *o = begin_chunk;
+                begin_chunk = begin_chunk->next;
+                begin_chunk->prev = NULL;
+                begin_pos = 0;
+
+                //  'o' has been more recently used than spare_chunk,
+                //  so for cache reasons we'll get rid of the spare and
+                //  use 'o' as the spare.
+                chunk_t *cs = spare_chunk.xchg (o);
+                if (cs)
+                    free (cs);
+            }
+        }
+
+    private:
+
+        //  Individual memory chunk to hold N elements.
+        struct chunk_t
+        {
+             T values [N];
+             chunk_t *prev;
+             chunk_t *next;
+        };
+
+        //  Back position may point to invalid memory if the queue is empty,
+        //  while begin & end positions are always valid. Begin position is
+        //  accessed exclusively be queue reader (front/pop), while back and
+        //  end positions are accessed exclusively by queue writer (back/push).
+        chunk_t *begin_chunk;
+        int begin_pos;
+        chunk_t *back_chunk;
+        int back_pos;
+        chunk_t *end_chunk;
+        int end_pos;
+
+        //  People are likely to produce and consume at similar rates.  In
+        //  this scenario holding onto the most recently freed chunk saves
+        //  us from having to call malloc/free.
+        atomic_ptr_t<chunk_t> spare_chunk;
+
+        //  Disable copying of yqueue.
+        yqueue_t (const yqueue_t&);
+        void operator = (const yqueue_t&);
+    };
+
+}
+
+#endif
diff --git a/src/zmq.cpp b/src/zmq.cpp
new file mode 100644
index 0000000..c8f419a
--- /dev/null
+++ b/src/zmq.cpp
@@ -0,0 +1,663 @@
+/*
+    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 <string.h>
+#include <errno.h>
+#include <stdlib.h>
+#include <new>
+
+#include "forwarder.hpp"
+#include "queue.hpp"
+#include "streamer.hpp"
+#include "socket_base.hpp"
+#include "app_thread.hpp"
+#include "msg_content.hpp"
+#include "platform.hpp"
+#include "stdint.hpp"
+#include "config.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
+#include <pgm/pgm.h>
+#endif
+
+void zmq_version (int *major_, int *minor_, int *patch_)
+{
+    *major_ = PACKAGE_VERSION_MAJOR;
+    *minor_ = PACKAGE_VERSION_MINOR;
+    *patch_ = PACKAGE_VERSION_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
+    }
+}
+
+int zmq_msg_init (zmq_msg_t *msg_)
+{
+    msg_->content = (zmq::msg_content_t*) ZMQ_VSM;
+    msg_->flags = 0;
+    msg_->vsm_size = 0;
+    return 0;
+}
+
+int zmq_msg_init_size (zmq_msg_t *msg_, size_t size_)
+{
+    if (size_ <= ZMQ_MAX_VSM_SIZE) {
+        msg_->content = (zmq::msg_content_t*) ZMQ_VSM;
+        msg_->flags = 0;
+        msg_->vsm_size = (uint8_t) size_;
+    }
+    else {
+        msg_->content =
+            (zmq::msg_content_t*) malloc (sizeof (zmq::msg_content_t) + size_);
+        if (!msg_->content) {
+            errno = ENOMEM;
+            return -1;
+        }
+        msg_->flags = 0;
+        
+        zmq::msg_content_t *content = (zmq::msg_content_t*) msg_->content;
+        content->data = (void*) (content + 1);
+        content->size = size_;
+        content->ffn = NULL;
+        content->hint = NULL;
+        new (&content->refcnt) zmq::atomic_counter_t ();
+    }
+    return 0;
+}
+
+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);
+    msg_->flags = 0;
+    zmq::msg_content_t *content = (zmq::msg_content_t*) msg_->content;
+    content->data = data_;
+    content->size = size_;
+    content->ffn = ffn_;
+    content->hint = hint_;
+    new (&content->refcnt) zmq::atomic_counter_t ();
+    return 0;
+}
+
+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 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 ();
+
+        if (content->ffn)
+            content->ffn (content->data, content->hint);
+        free (content);
+    }
+
+    return 0;
+}
+
+int zmq_msg_move (zmq_msg_t *dest_, zmq_msg_t *src_)
+{
+    zmq_msg_close (dest_);
+    *dest_ = *src_;
+    zmq_msg_init (src_);
+    return 0;
+}
+
+int zmq_msg_copy (zmq_msg_t *dest_, zmq_msg_t *src_)
+{
+    zmq_msg_close (dest_);
+
+    //  VSMs and delimiters require no special handling.
+    if (src_->content != (zmq::msg_content_t*) ZMQ_DELIMITER &&
+          src_->content != (zmq::msg_content_t*) ZMQ_VSM) {
+
+        //  One reference is added to shared messages. Non-shared messages
+        //  are turned into shared messages and reference count is set to 2.
+        zmq::msg_content_t *content = (zmq::msg_content_t*) src_->content;
+        if (src_->flags & ZMQ_MSG_SHARED)
+            content->refcnt.add (1);
+        else {
+            src_->flags |= ZMQ_MSG_SHARED;
+            content->refcnt.set (2);
+        }
+    }
+
+    *dest_ = *src_;
+    return 0;
+}
+
+void *zmq_msg_data (zmq_msg_t *msg_)
+{
+    if (msg_->content == (zmq::msg_content_t*) ZMQ_VSM)
+        return msg_->vsm_data;
+    if (msg_->content == (zmq::msg_content_t*) ZMQ_DELIMITER)
+        return NULL;
+
+    return ((zmq::msg_content_t*) msg_->content)->data;
+}
+
+size_t zmq_msg_size (zmq_msg_t *msg_)
+{
+    if (msg_->content == (zmq::msg_content_t*) ZMQ_VSM)
+        return msg_->vsm_size;
+    if (msg_->content == (zmq::msg_content_t*) ZMQ_DELIMITER)
+        return 0;
+
+    return ((zmq::msg_content_t*) msg_->content)->size;
+}
+
+void *zmq_init (int io_threads_)
+{
+    if (io_threads_ < 0) {
+        errno = EINVAL;
+        return NULL;
+    }
+
+#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);
+            errno = EINVAL;
+            return NULL;
+        }
+        zmq_assert (false);
+    }
+#endif
+
+    //  Create 0MQ context.
+    zmq::ctx_t *ctx = new (std::nothrow) zmq::ctx_t ((uint32_t) io_threads_);
+    zmq_assert (ctx);
+    return (void*) ctx;
+}
+
+int zmq_term (void *ctx_)
+{
+    int rc = ((zmq::ctx_t*) ctx_)->term ();
+    int en = errno;
+
+#if defined ZMQ_HAVE_OPENPGM
+    //  Shut down the OpenPGM library.
+    if (pgm_shutdown () != TRUE)
+        zmq_assert (false);
+#endif
+
+    errno = en;
+    return rc;
+}
+
+void *zmq_socket (void *ctx_, int type_)
+{
+    return (void*) (((zmq::ctx_t*) ctx_)->create_socket (type_));
+}
+
+int zmq_close (void *s_)
+{
+    ((zmq::socket_base_t*) s_)->close ();
+    return 0;
+}
+
+int zmq_setsockopt (void *s_, int option_, const void *optval_,
+    size_t optvallen_)
+{
+    return (((zmq::socket_base_t*) s_)->setsockopt (option_, optval_,
+        optvallen_));
+}
+
+int zmq_getsockopt (void *s_, int option_, void *optval_, size_t *optvallen_)
+{
+    return (((zmq::socket_base_t*) s_)->getsockopt (option_, optval_,
+        optvallen_));
+}
+
+int zmq_bind (void *s_, const char *addr_)
+{
+    return (((zmq::socket_base_t*) s_)->bind (addr_));
+}
+
+int zmq_connect (void *s_, const char *addr_)
+{
+    return (((zmq::socket_base_t*) s_)->connect (addr_));
+}
+
+int zmq_send (void *s_, zmq_msg_t *msg_, int flags_)
+{
+    return (((zmq::socket_base_t*) s_)->send (msg_, flags_));
+}
+
+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 ||\
+    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
+
+    pollfd *pollfds = (pollfd*) malloc (nitems_ * sizeof (pollfd));
+    zmq_assert (pollfds);
+    int npollfds = 0;
+    int nsockets = 0;
+
+    zmq::app_thread_t *app_thread = NULL;
+
+    for (int i = 0; i != nitems_; i++) {
+
+        //  0MQ sockets.
+        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;
+                }
+            }
+            else
+                app_thread = s->get_thread ();
+
+            nsockets++;
+            continue;
+        }
+
+        //  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;
+        }
+        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;
+    int nevents = 0;
+
+    while (true) {
+
+        //  Process 0MQ commands if needed.
+        if (nsockets && pollfds [npollfds -1].revents & POLLIN)
+            if (!app_thread->process_commands (false, false)) {
+                free (pollfds);
+                errno = ETERM;
+                return -1;
+            }
+
+        //  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
+            //  the events to zmq_pollitem_t-style format.
+            if (!items_ [i].socket) {
+                items_ [i].revents = 0;
+                if (pollfds [pollfd_pos].revents & POLLIN)
+                    items_ [i].revents |= ZMQ_POLLIN;
+                if (pollfds [pollfd_pos].revents & POLLOUT)
+                    items_ [i].revents |= ZMQ_POLLOUT;
+                if (pollfds [pollfd_pos].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_)
+            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);
+            break;
+        }
+        
+        //  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;
+    }
+
+    free (pollfds);
+    return nevents;
+
+#elif defined ZMQ_HAVE_WINDOWS || defined ZMQ_HAVE_OPENVMS
+
+    fd_set pollset_in;
+    FD_ZERO (&pollset_in);
+    fd_set pollset_out;
+    FD_ZERO (&pollset_out);
+    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;
+
+    for (int i = 0; i != nitems_; i++) {
+
+        //  0MQ sockets.
+        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;
+                }
+            }
+            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;
+        }
+        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};
+    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;
+                return -1;
+            }
+
+        //  Check for the events.
+        for (int i = 0; i != nitems_; i++) {
+
+            //  If 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 (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))
+            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
+            break;
+        }
+        
+        //  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;
+    }
+
+    return nevents;
+
+#else
+    errno = ENOTSUP;
+    return -1;
+#endif
+}
+
+int zmq_errno ()
+{
+    return errno;
+}
+
+int zmq_device (int device_, void *insocket_, void *outsocket_)
+{
+    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;
+    }
+}
diff --git a/src/zmq_connecter.cpp b/src/zmq_connecter.cpp
new file mode 100644
index 0000000..ebd7572
--- /dev/null
+++ b/src/zmq_connecter.cpp
@@ -0,0 +1,136 @@
+/*
+    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 "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_),
+    handle_valid (false),
+    wait (wait_),
+    session_ordinal (session_ordinal_),
+    options (options_)
+{
+}
+
+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;
+}
+
+void zmq::zmq_connecter_t::process_plug ()
+{
+    if (wait)
+        add_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
+    //  because of error here. However, we can get error on out event as well
+    //  on some platforms, so we'll simply handle both events in the same way.
+    out_event ();
+}
+
+void zmq::zmq_connecter_t::out_event ()
+{
+    fd_t fd = tcp_connecter.connect ();
+    rm_fd (handle);
+    handle_valid = false;
+
+    //  Handle the error condition by attempt to reconnect.
+    if (fd == retired_fd) {
+        tcp_connecter.close ();
+        wait = true;
+        add_timer ();
+        return;
+    }
+
+    //  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 ();
+}
+
+void zmq::zmq_connecter_t::timer_event ()
+{
+    wait = false;
+    start_connecting ();
+}
+
+void zmq::zmq_connecter_t::start_connecting ()
+{
+    //  Open the connecting socket.
+    int rc = tcp_connecter.open ();
+
+    //  Connect may succeed in synchronous manner.
+    if (rc == 0) {
+        handle = add_fd (tcp_connecter.get_fd ());
+        handle_valid = true;
+        out_event ();
+        return;
+    }
+
+    //  Connection establishment may be dealyed. Poll for its completion.
+    else if (rc == -1 && errno == EAGAIN) {
+        handle = add_fd (tcp_connecter.get_fd ());
+        handle_valid = true;
+        set_pollout (handle);
+        return;
+    }
+
+    //  Handle any other error condition by eventual reconnect.
+    wait = true;
+    add_timer ();
+}
diff --git a/src/zmq_connecter.hpp b/src/zmq_connecter.hpp
new file mode 100644
index 0000000..328dd6a
--- /dev/null
+++ b/src/zmq_connecter.hpp
@@ -0,0 +1,88 @@
+/*
+    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_CONNECTER_HPP_INCLUDED__
+#define __ZMQ_ZMQ_CONNECTER_HPP_INCLUDED__
+
+#include <string>
+
+#include "owned.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
+    {
+    public:
+
+        zmq_connecter_t (class io_thread_t *parent_, socket_base_t *owner_,
+            const options_t &options_, uint64_t session_ordinal_, bool wait_);
+        ~zmq_connecter_t ();
+
+        //  Set address to connect to.
+        int set_address (const char *protocol_, const char *address_);
+
+    private:
+
+        //  Handlers for incoming commands.
+        void process_plug ();
+        void process_unplug ();
+
+        //  Handlers for I/O events.
+        void in_event ();
+        void out_event ();
+        void timer_event ();
+
+        //  Internal function to start the actual connection establishment.
+        void start_connecting ();
+
+        //  Actual connecting socket.
+        tcp_connecter_t tcp_connecter;
+
+        //  Handle corresponding to the listening socket.
+        handle_t handle;
+
+        //  If true file descriptor is registered with the poller and 'handle'
+        //  contains valid value.
+        bool handle_valid;
+
+        //  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;
+
+        //  Protocol and address to connect to.
+        std::string protocol;
+        std::string address;
+
+        zmq_connecter_t (const zmq_connecter_t&);
+        void operator = (const zmq_connecter_t&);
+    };
+
+}
+
+#endif
diff --git a/src/zmq_decoder.cpp b/src/zmq_decoder.cpp
new file mode 100644
index 0000000..8e335c9
--- /dev/null
+++ b/src/zmq_decoder.cpp
@@ -0,0 +1,107 @@
+/*
+    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 <stdlib.h>
+#include <string.h>
+
+#include "zmq_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_),
+    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);
+}
+
+zmq::zmq_decoder_t::~zmq_decoder_t ()
+{
+    zmq_msg_close (&in_progress);
+}
+
+void zmq::zmq_decoder_t::set_inout (i_inout *destination_)
+{
+    destination = destination_;
+}
+
+bool zmq::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);
+    else {
+
+        //  TODO:  Handle over-sized message decently.
+
+        //  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);
+        errno_assert (rc == 0);
+        next_step (tmpbuf, 1, &zmq_decoder_t::flags_ready);
+    }
+    return true;
+}
+
+bool zmq::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.
+
+    //  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);
+    errno_assert (rc == 0);
+    next_step (tmpbuf, 1, &zmq_decoder_t::flags_ready);
+
+    return true;
+}
+
+bool zmq::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);
+    
+    return true;
+}
+
+bool zmq::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);
+    return true;
+}
diff --git a/src/zmq_decoder.hpp b/src/zmq_decoder.hpp
new file mode 100644
index 0000000..c1e3e3e
--- /dev/null
+++ b/src/zmq_decoder.hpp
@@ -0,0 +1,59 @@
+/*
+    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.cpp b/src/zmq_encoder.cpp
new file mode 100644
index 0000000..077286f
--- /dev/null
+++ b/src/zmq_encoder.cpp
@@ -0,0 +1,89 @@
+/*
+    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 "zmq_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_),
+    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);
+}
+
+zmq::zmq_encoder_t::~zmq_encoder_t ()
+{
+    zmq_msg_close (&in_progress);
+}
+
+void zmq::zmq_encoder_t::set_inout (i_inout *source_)
+{
+    source = source_;
+}
+
+bool zmq::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);
+    return true;
+}
+
+bool zmq::zmq_encoder_t::message_ready ()
+{
+    //  Destroy content of the old message.
+    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
+    //  unsuccessful write will cause retry on the next state machine
+    //  invocation.
+    if (!source || !source->read (&in_progress)) {
+        zmq_msg_init (&in_progress);
+        return false;
+    }
+
+    //  Get the message size.
+    size_t size = zmq_msg_size (&in_progress);
+
+    //  Account for the 'flags' byte.
+    size++;
+
+    //  For messages less than 255 bytes long, write one byte of message size.
+    //  For longer messages write 0xff escape character followed by 8-byte
+    //  message size. In both cases 'flags' field follows.
+    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,
+            !(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,
+            !(in_progress.flags & ZMQ_MSG_MORE));
+    }
+    return true;
+}
diff --git a/src/zmq_encoder.hpp b/src/zmq_encoder.hpp
new file mode 100644
index 0000000..61899f4
--- /dev/null
+++ b/src/zmq_encoder.hpp
@@ -0,0 +1,55 @@
+/*
+    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
new file mode 100644
index 0000000..41b10c8
--- /dev/null
+++ b/src/zmq_engine.cpp
@@ -0,0 +1,195 @@
+/*
+    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 "platform.hpp"
+#if defined ZMQ_HAVE_WINDOWS
+#include "windows.hpp"
+#endif
+
+#include <string.h>
+#include <new>
+
+#include "zmq_engine.hpp"
+#include "zmq_connecter.hpp"
+#include "io_thread.hpp"
+#include "i_inout.hpp"
+#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_),
+    inpos (NULL),
+    insize (0),
+    decoder (in_batch_size),
+    outpos (NULL),
+    outsize (0),
+    encoder (out_batch_size),
+    inout (NULL),
+    options (options_),
+    reconnect (reconnect_)
+{
+    if (reconnect) {
+        protocol = protocol_;
+        address = address_;
+    }
+
+    //  Initialise the underlying socket.
+    int rc = tcp_socket.open (fd_, options.sndbuf, options.rcvbuf);
+    zmq_assert (rc == 0);
+}
+
+zmq::zmq_engine_t::~zmq_engine_t ()
+{
+}
+
+void zmq::zmq_engine_t::plug (i_inout *inout_)
+{
+    zmq_assert (!inout);
+
+    encoder.set_inout (inout_);
+    decoder.set_inout (inout_);
+
+    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 ()
+{
+    rm_fd (handle);
+    encoder.set_inout (NULL);
+    decoder.set_inout (NULL);
+    inout = NULL;
+}
+
+void zmq::zmq_engine_t::in_event ()
+{
+    bool disconnection = false;
+
+    //  If there's no data to process in the buffer...
+    if (!insize) {
+
+        //  Retrieve the buffer and read as much data as possible.
+        decoder.get_buffer (&inpos, &insize);
+        insize = tcp_socket.read (inpos, insize);
+
+        //  Check whether the peer has closed the connection.
+        if (insize == (size_t) -1) {
+            insize = 0;
+            disconnection = true;
+        }
+    }
+
+    //  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);
+    }
+
+    //  Adjust the buffer.
+    inpos += processed;
+    insize -= processed;
+
+    //  Flush all messages the decoder may have produced.
+    inout->flush ();
+
+    if (disconnection)
+        error ();
+}
+
+void zmq::zmq_engine_t::out_event ()
+{
+    //  If write buffer is empty, try to read new data from the encoder.
+    if (!outsize) {
+
+        outpos = NULL;
+        encoder.get_data (&outpos, &outsize);
+        
+        //  If there is no data to send, stop polling for output.
+        if (outsize == 0) {
+            reset_pollout (handle);
+            return;
+        }
+    }
+
+    //  If there are any data to write in write buffer, write as much as
+    //  possible to the socket.
+    int nbytes = tcp_socket.write (outpos, outsize);
+
+    //  Handle problems with the connection.
+    if (nbytes == -1) {
+        error ();
+        return;
+    }
+
+    outpos += nbytes;
+    outsize -= nbytes;
+}
+
+void zmq::zmq_engine_t::revive ()
+{
+    set_pollout (handle);
+
+    //  Speculative write: The assumption is that at the moment new message
+    //  was sent by the user the socket is probably available for writing.
+    //  Thus we try to write the data to socket avoiding polling for POLLOUT.
+    //  Consequently, the latency should be better in request/reply scenarios.
+    out_event ();
+}
+
+void zmq::zmq_engine_t::resume_input ()
+{
+    set_pollin (handle);
+
+    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);
+    unplug ();
+    delete this;
+}
diff --git a/src/zmq_engine.hpp b/src/zmq_engine.hpp
new file mode 100644
index 0000000..d89dccc
--- /dev/null
+++ b/src/zmq_engine.hpp
@@ -0,0 +1,86 @@
+/*
+    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_ENGINE_HPP_INCLUDED__
+#define __ZMQ_ZMQ_ENGINE_HPP_INCLUDED__
+
+#include <stddef.h>
+
+#include <string>
+
+#include "i_engine.hpp"
+#include "io_object.hpp"
+#include "tcp_socket.hpp"
+#include "zmq_encoder.hpp"
+#include "zmq_decoder.hpp"
+#include "options.hpp"
+
+namespace zmq
+{
+
+    class zmq_engine_t : public io_object_t, public i_engine
+    {
+    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 ();
+
+        //  i_engine interface implementation.
+        void plug (struct i_inout *inout_);
+        void unplug ();
+        void revive ();
+        void resume_input ();
+
+        //  i_poll_events interface implementation.
+        void in_event ();
+        void out_event ();
+
+    private:
+
+        //  Function to handle network disconnections.
+        void error ();
+
+        tcp_socket_t tcp_socket;
+        handle_t handle;
+
+        unsigned char *inpos;
+        size_t insize;
+        zmq_decoder_t decoder;
+
+        unsigned char *outpos;
+        size_t outsize;
+        zmq_encoder_t encoder;
+
+        i_inout *inout;
+
+        options_t options;
+
+        bool reconnect;
+        std::string protocol;
+        std::string address;
+
+        zmq_engine_t (const zmq_engine_t&);
+        void operator = (const zmq_engine_t&);
+    };
+
+}
+
+#endif
diff --git a/src/zmq_init.cpp b/src/zmq_init.cpp
new file mode 100644
index 0000000..5824f5c
--- /dev/null
+++ b/src/zmq_init.cpp
@@ -0,0 +1,195 @@
+/*
+    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 <string.h>
+
+#include "zmq_init.hpp"
+#include "zmq_engine.hpp"
+#include "io_thread.hpp"
+#include "session.hpp"
+#include "uuid.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_),
+    sent (false),
+    received (false),
+    session_ordinal (session_ordinal_),
+    options (options_)
+{
+    //  Create the engine object for this connection.
+    engine = new (std::nothrow) zmq_engine_t (parent_, fd_, options,
+        reconnect_, protocol_, address_);
+    zmq_assert (engine);
+}
+
+zmq::zmq_init_t::~zmq_init_t ()
+{
+    if (engine)
+        delete engine;
+}
+
+bool zmq::zmq_init_t::read (::zmq_msg_t *msg_)
+{
+    //  If the identity was already sent, do nothing.
+    if (sent)
+        return false;
+
+    //  Send the identity.
+    int rc = zmq_msg_init_size (msg_, options.identity.size ());
+    zmq_assert (rc == 0);
+    memcpy (zmq_msg_data (msg_), options.identity.c_str (),
+        options.identity.size ());
+    sent = true;
+
+    //  If initialisation is done, pass the engine to the session and
+    //  destroy the init object.
+    finalise ();
+
+    return true;
+}
+
+bool zmq::zmq_init_t::write (::zmq_msg_t *msg_)
+{
+    //  If identity was already received, we are not interested
+    //  in subsequent messages.
+    if (received)
+        return false;
+
+    //  Retreieve the remote identity. If it's empty, generate a unique name.
+    if (!zmq_msg_size (msg_)) {
+        unsigned char identity [uuid_t::uuid_blob_len + 1];
+        identity [0] = 0;
+        memcpy (identity + 1, uuid_t ().to_blob (), uuid_t::uuid_blob_len);
+        peer_identity.assign (identity, uuid_t::uuid_blob_len + 1);
+    }
+    else {
+        peer_identity.assign ((const unsigned char*) zmq_msg_data (msg_),
+            zmq_msg_size (msg_));
+    }
+
+    received = true;
+
+    return true;
+}
+
+void zmq::zmq_init_t::flush ()
+{
+    //  Check if there's anything to flush.
+    if (!received)
+        return;
+
+    //  If initialisation is done, pass the engine to the session and
+    //  destroy the init object.
+    finalise ();
+}
+
+void zmq::zmq_init_t::detach (owned_t *reconnecter_)
+{
+    //  This function is called by engine when disconnection occurs.
+
+    //  If required, launch the reconnecter.
+    if (reconnecter_) {
+        send_plug (reconnecter_);
+        send_own (owner, reconnecter_);
+    }
+
+    //  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;
+}
+
+void zmq::zmq_init_t::process_plug ()
+{
+    zmq_assert (engine);
+    engine->plug (this);
+}
+
+void zmq::zmq_init_t::process_unplug ()
+{
+    if (engine)
+        engine->unplug ();
+}
+
+void zmq::zmq_init_t::finalise ()
+{
+    if (sent && received) {
+
+        //  Disconnect the engine from the init object.
+        engine->unplug ();
+
+        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;
+            }
+        }
+        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 ();
+            }
+        }
+
+        //  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 ();
+    }
+}
diff --git a/src/zmq_init.hpp b/src/zmq_init.hpp
new file mode 100644
index 0000000..6f935c2
--- /dev/null
+++ b/src/zmq_init.hpp
@@ -0,0 +1,89 @@
+/*
+    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_INIT_HPP_INCLUDED__
+#define __ZMQ_ZMQ_INIT_HPP_INCLUDED__
+
+#include "i_inout.hpp"
+#include "i_engine.hpp"
+#include "owned.hpp"
+#include "fd.hpp"
+#include "stdint.hpp"
+#include "options.hpp"
+#include "stdint.hpp"
+#include "blob.hpp"
+
+namespace zmq
+{
+
+    //  The class handles initialisation phase of 0MQ wire-level protocol.
+
+    class zmq_init_t : public owned_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 ();
+
+    private:
+
+        void finalise ();
+
+        //  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 ();
+
+        //  Handlers for incoming commands.
+        void process_plug ();
+        void process_unplug ();
+
+        //  Associated wite-protocol engine.
+        i_engine *engine;
+
+        //  True if our own identity was already sent to the peer.
+        bool sent;
+
+        //  True if peer's identity was already received.
+        bool received;
+
+        //  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;
+
+        zmq_init_t (const zmq_init_t&);
+        void operator = (const zmq_init_t&);
+    };
+
+}
+
+#endif
diff --git a/src/zmq_listener.cpp b/src/zmq_listener.cpp
new file mode 100644
index 0000000..d7cf292
--- /dev/null
+++ b/src/zmq_listener.cpp
@@ -0,0 +1,75 @@
+/*
+    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 "zmq_listener.hpp"
+#include "zmq_init.hpp"
+#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 ()
+{
+}
+
+int zmq::zmq_listener_t::set_address (const char *protocol_, const char *addr_)
+{
+     return tcp_listener.set_address (protocol_, addr_);
+}
+
+void zmq::zmq_listener_t::process_plug ()
+{
+    //  Start polling for incoming connections.
+    handle = add_fd (tcp_listener.get_fd ());
+    set_pollin (handle);
+}
+
+void zmq::zmq_listener_t::process_unplug ()
+{
+    rm_fd (handle);
+}
+
+void zmq::zmq_listener_t::in_event ()
+{
+    fd_t fd = tcp_listener.accept ();
+
+    //  If connection was reset by the peer in the meantime, just ignore it.
+    //  TODO: Handle specific errors like ENFILE/EMFILE etc.
+    if (fd == retired_fd)
+        return;
+
+    //  Create an init object. 
+    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);
+}
+
+
+
diff --git a/src/zmq_listener.hpp b/src/zmq_listener.hpp
new file mode 100644
index 0000000..c990b02
--- /dev/null
+++ b/src/zmq_listener.hpp
@@ -0,0 +1,67 @@
+/*
+    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_LISTENER_HPP_INCLUDED__
+#define __ZMQ_ZMQ_LISTENER_HPP_INCLUDED__
+
+#include "owned.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
+    {
+    public:
+
+        zmq_listener_t (class io_thread_t *parent_, socket_base_t *owner_,
+            const options_t &options_);
+        ~zmq_listener_t ();
+
+        //  Set address to listen on.
+        int set_address (const char* protocol_, const char *addr_);
+
+    private:
+
+        //  Handlers for incoming commands.
+        void process_plug ();
+        void process_unplug ();
+
+        //  Handlers for I/O events.
+        void in_event ();
+
+        //  Actual listening socket.
+        tcp_listener_t tcp_listener;
+
+        //  Handle corresponding to the listening socket.
+        handle_t handle;
+
+        //  Associated socket options.
+        options_t options;
+
+        zmq_listener_t (const zmq_listener_t&);
+        void operator = (const zmq_listener_t&);
+    };
+
+}
+
+#endif