Merge branch 'maint'

* maint:
  Fix socket_t::recv() hang scenario where initial call to process_commands() eats signal

Conflicts:
	src/socket_base.cpp

AUTHORS

@@ -26,6 +26,7 @@ Jacob Rideout <jacob.rideout@returnpath.net>
 Joe Thornber <joe.thornber@gmail.com>
 Jon Dyte <jon@totient.co.uk>
 Kamil Shakirov <kamils80@gmail.com>
+Marc Rossi <mrossi19@gmail.com>
 Martin Hurton <hurtonm@gmail.com>
 Martin Lucina <mato@kotelna.sk>
 Martin Pales <m.pales@gmail.com>

src/socket_base.cpp

@@ -519,13 +519,15 @@ int zmq::socket_base_t::recv (::zmq_msg_t *msg_, int flags_)
 
     //  In blocking scenario, commands are processed over and over again until
     //  we are able to fetch a message.
+    bool block = (ticks != 0);
     while (rc != 0) {
         if (errno != EAGAIN)
             return -1;
-        if (unlikely (process_commands (true, false) != 0))
+        if (unlikely (process_commands (block, false) != 0))
             return -1;
         rc = xrecv (msg_, flags_);
         ticks = 0;
+        block = true;
     }
 
     rcvmore = msg_->flags & ZMQ_MSG_MORE;