Problem: REQ socket with ZMQ_REQ_RELAXED does not report ZMQ_POLLOUT when queried for events after first message.

Solution: Check for strictness before returning false if no reply has been received.

src/req.cpp

@@ -213,7 +213,7 @@ bool zmq::req_t::xhas_in ()
 
 bool zmq::req_t::xhas_out ()
 {
-    if (receiving_reply)
+    if (receiving_reply && strict)
         return false;
 
     return dealer_t::xhas_out ();

tests/test_req_relaxed.cpp

@@ -54,6 +54,16 @@ static void bounce (void *socket)
     } while (more);
 }
 
+static int get_events (void *socket)
+{
+    int rc;
+    int events;
+    size_t events_size = sizeof(events);
+    rc = zmq_getsockopt (socket, ZMQ_EVENTS, &events, &events_size);
+    assert (rc == 0);
+    return events;
+}
+
 int main (void)
 {
     setup_test_environment ();
@@ -97,14 +107,23 @@ int main (void)
 
     //  Case 1: Second send() before a reply arrives in a pipe.
 
+    int events = get_events (req);
+    assert(events == ZMQ_POLLOUT);
+
     //  Send a request, ensure it arrives, don't send a reply
     s_send_seq (req, "A", "B", SEQ_END);
     s_recv_seq (rep [0], "A", "B", SEQ_END);
 
+    events = get_events (req);
+    assert(events == ZMQ_POLLOUT);
+
     //  Send another request on the REQ socket
     s_send_seq (req, "C", "D", SEQ_END);
     s_recv_seq (rep [1], "C", "D", SEQ_END);
 
+    events = get_events (req);
+    assert(events == ZMQ_POLLOUT);
+
     //  Send a reply to the first request - that should be discarded by the REQ
     s_send_seq (rep [0], "WRONG", SEQ_END);
 
@@ -112,7 +131,6 @@ int main (void)
     s_send_seq (rep [1], "OK", SEQ_END);
     s_recv_seq (req, "OK", SEQ_END);
 
-
     //  Another standard req-rep cycle, just to check
     s_send_seq (req, "E", SEQ_END);
     s_recv_seq (rep [2], "E", SEQ_END);