Added test for HWM

Signed-off-by: Mikko Koppanen <mkoppanen@php.net>

tests/test_hwm.cpp

@@ -0,0 +1,67 @@
+/*
+    Copyright (c) 2007-2010 iMatix Corporation
+
+    This file is part of 0MQ.
+
+    0MQ is free software; you can redistribute it and/or modify it under
+    the terms of the GNU Lesser General Public License as published by
+    the Free Software Foundation; either version 3 of the License, or
+    (at your option) any later version.
+
+    0MQ is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU Lesser General Public License for more details.
+
+    You should have received a copy of the GNU Lesser General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "testutil.hpp"
+#include "../src/stdint.hpp"
+
+using namespace std;
+using namespace zmqtestutil;
+
+int main (int argc, char *argv [])
+{
+    uint64_t hwm = 5;
+    int linger = 0;
+
+    zmq::context_t context (1);
+    zmq::socket_t s1 (context, ZMQ_PULL);
+    zmq::socket_t s2 (context, ZMQ_PUSH);
+
+    s2.setsockopt (ZMQ_LINGER, &linger, sizeof (int));
+    s2.setsockopt (ZMQ_HWM, &hwm, sizeof (uint64_t));
+
+    s1.bind ("tcp://127.0.0.1:5858");
+    s2.connect ("tcp://127.0.0.1:5858");
+
+    for (int i = 0; i < 10; i++)
+    {
+        zmq::message_t msg (sizeof ("test") - 1);
+        memcpy (msg.data (), "test", sizeof ("test") - 1);
+
+        bool sent = s2.send (msg, ZMQ_NOBLOCK);
+
+        // Anything below HWM should be sent
+        if (i < 5) {
+            assert (sent);
+        } else {
+            assert (!sent && errno == EAGAIN);
+        }
+    }
+
+    // There should be now 5 messages pending, consume one
+    zmq::message_t msg;
+
+    bool received = s1.recv (&msg, 0);
+    assert (received);
+
+    // Now it should be possible to send one more
+    bool sent = s2.send (msg, 0);
+    assert (sent);
+
+	return 0;
+}