Socket with no owner objects is deallocated immediately

Till now the deallocation of such socket was delayed
till zmq_term() thus creating a "leak".
Signed-off-by: Martin Sustrik <sustrik@250bpm.com>

src/reaper.cpp

@@ -96,12 +96,13 @@ void zmq::reaper_t::process_stop ()
 
 void zmq::reaper_t::process_reap (socket_base_t *socket_)
 {
-    //  Start termination of associated I/O object hierarchy.
-    socket_->terminate ();
-
     //  Add the socket to the poller.
     socket_->start_reaping (poller);
 
+    //  Start termination of associated I/O object hierarchy.
+    socket_->terminate ();
+    socket_->check_destroy ();
+
     ++sockets;
 }
 

src/socket_base.cpp

@@ -754,7 +754,21 @@ void zmq::socket_base_t::in_event ()
     //  Process any commands from other threads/sockets that may be available
     //  at the moment. Ultimately, socket will be destroyed.
     process_commands (false, false);
+    check_destroy ();
+}
+
+void zmq::socket_base_t::out_event ()
+{
+    zmq_assert (false);
+}
+
+void zmq::socket_base_t::timer_event (int id_)
+{
+    zmq_assert (false);
+}
 
+void zmq::socket_base_t::check_destroy ()
+{
     //  If the object was already marked as destroyed, finish the deallocation.
     if (destroyed) {
 
@@ -771,13 +785,3 @@ void zmq::socket_base_t::in_event ()
         own_t::process_destroy ();
     }
 }
-
-void zmq::socket_base_t::out_event ()
-{
-    zmq_assert (false);
-}
-
-void zmq::socket_base_t::timer_event (int id_)
-{
-    zmq_assert (false);
-}

src/socket_base.hpp

@@ -97,6 +97,10 @@ namespace zmq
         void out_event ();
         void timer_event (int id_);
 
+        //  To be called after processing commands or invoking any command
+        //  handlers explicitly. If required, it will deallocate the socket.
+        void check_destroy ();
+
     protected:
 
         socket_base_t (class ctx_t *parent_, uint32_t tid_);