WIP: Socket migration between threads, new zmq_close() semantics

Sockets may now be migrated between OS threads; sockets may not be used by
more than one thread at any time. To migrate a socket to another thread the
caller must ensure that a full memory barrier is called before using the
socket from the target thread.

The new zmq_close() semantics implement the behaviour discussed at:

http://lists.zeromq.org/pipermail/zeromq-dev/2010-July/004244.html

Specifically, zmq_close() is now deterministic and while it still returns
immediately, it does not discard any data that may still be queued for
sending. Further, zmq_term() will now block until all outstanding data has
been sent.

TODO: Many bugs have been introduced, needs testing. Further, SO_LINGER or
an equivalent mechanism (possibly a configurable timeout to zmq_term())
needs to be implemented.

1 files changed, 17 insertions, 9 deletions

diff --git a/src/xrep.hpp b/src/xrep.hpp
index da1b3d8..1c240ff 100644
--- a/src/xrep.hpp
+++ b/src/xrep.hpp
@@ -25,32 +25,40 @@
 
 #include "socket_base.hpp"
 #include "blob.hpp"
+#include "pipe.hpp"
 
 namespace zmq
 {
 
     //  TODO: This class uses O(n) scheduling. Rewrite it to use O(1) algorithm.
-    class xrep_t : public socket_base_t
+    class xrep_t :
+        public socket_base_t,
+        public i_reader_events,
+        public i_writer_events
     {
     public:
 
-        xrep_t (class app_thread_t *parent_);
+        xrep_t (class ctx_t *parent_, uint32_t slot_);
         ~xrep_t ();
 
         //  Overloads of functions from socket_base_t.
-        void xattach_pipes (class reader_t *inpipe_, class writer_t *outpipe_,
+        void xattach_pipes (reader_t *inpipe_, writer_t *outpipe_,
             const blob_t &peer_identity_);
-        void xdetach_inpipe (class reader_t *pipe_);
-        void xdetach_outpipe (class writer_t *pipe_);
-        void xkill (class reader_t *pipe_);
-        void xrevive (class reader_t *pipe_);
-        void xrevive (class writer_t *pipe_);
-        int xsetsockopt (int option_, const void *optval_, size_t optvallen_);
+        void xterm_pipes ();
+        bool xhas_pipes ();
         int xsend (zmq_msg_t *msg_, int flags_);
         int xrecv (zmq_msg_t *msg_, int flags_);
         bool xhas_in ();
         bool xhas_out ();
 
+        //  i_reader_events interface implementation.
+        void activated (reader_t *pipe_);
+        void terminated (reader_t *pipe_);
+
+        //  i_writer_events interface implementation.
+        void activated (writer_t *pipe_);
+        void terminated (writer_t *pipe_);
+
     private:
 
         struct inpipe_t