libzmq/tests/test_xpub_nodrop.cpp

/*
    Copyright (c) 2007-2014 Contributors as noted in the AUTHORS file

    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"

int main (void)
{
    setup_test_environment();
    void *ctx = zmq_ctx_new ();
    assert (ctx);

    //  Create a publisher
    void *pub = zmq_socket (ctx, ZMQ_PUB);
    assert (pub);
    int rc = zmq_bind (pub, "inproc://soname");
    assert (rc == 0);

    //  set pub socket options
    int wait = 1;
    rc = zmq_setsockopt (pub, ZMQ_XPUB_NODROP, &wait, 4);
    assert (rc == 0);

    int hwm = 2000;
    rc = zmq_setsockopt (pub, ZMQ_SNDHWM, &hwm, 4);
    assert (rc == 0);

    //  Create a subscriber
    void *sub = zmq_socket (ctx, ZMQ_SUB);
    assert (sub);
    rc = zmq_connect (sub, "inproc://soname");
    assert (rc == 0);

    //  Subscribe for all messages.
    rc = zmq_setsockopt (sub, ZMQ_SUBSCRIBE, "", 0);
    assert (rc == 0);

    int hwmlimit = hwm - 1;
    int send_count = 0;
    
    //  Send an empty message
    for (int i = 0; i < hwmlimit; i++) {
        rc = zmq_send (pub, NULL, 0, 0);
        assert (rc == 0);
        send_count++;
    }

    int recv_count = 0;
    do {
        //  Receive the message in the subscriber
        rc = zmq_recv (sub, NULL, 0, ZMQ_DONTWAIT);
        if (rc == -1)
            assert (errno == EAGAIN);
        else {
            assert (rc == 0);
            recv_count++;
        }
    }
    while (rc == 0);

    assert (send_count == recv_count);
    
    //  Now test real blocking behavior
    //  Set a timeout, default is infinite
    int timeout = 0;
    rc = zmq_setsockopt (pub, ZMQ_SNDTIMEO, &timeout, 4);
    assert (rc == 0);

    send_count = 0;
    recv_count = 0;
    hwmlimit = hwm;
    
    //  Send an empty message until we get an error, which must be EAGAIN
    while (zmq_send (pub, "", 0, 0) == 0)
        send_count++;
    assert (errno == EAGAIN);

    while (zmq_recv (sub, NULL, 0, ZMQ_DONTWAIT) == 0)
        recv_count++;
    assert (send_count == recv_count);

    //  Clean up.
    rc = zmq_close (pub);
    assert (rc == 0);
    rc = zmq_close (sub);
    assert (rc == 0);
    rc = zmq_ctx_term (ctx);
    assert (rc == 0);

    return 0 ;
}