pipe_t::rollback removes only unfinished message from the pipe rather than all unflushed messages

src/pipe.cpp

@@ -170,6 +170,10 @@ void zmq::writer_t::rollback ()
     zmq_msg_t msg;
 
     while (pipe->unwrite (&msg)) {
+        if (!(msg.flags & ZMQ_MSG_TBC)) {
+            pipe->write (msg);
+            break;
+        }
         zmq_msg_close (&msg);
         msgs_written--;
     }

src/pipe.hpp

@@ -98,7 +98,7 @@ namespace zmq
         //  message cannot be written because high watermark was reached.
         bool write (zmq_msg_t *msg_);
 
-        //  Remove any unflushed messages from the pipe.
+        //  Remove unfinished part of a message from the pipe.
         void rollback ();
 
         //  Flush the messages downsteam.