test_many_sockets.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"
#include <zmq.h>
#include <stdio.h>
#include <stdlib.h>
#include <vector>

void test_system_max ()
{
    // Keep allocating sockets until we run out of system resources
    const int no_of_sockets = 2 * 65536;
    void *ctx = zmq_ctx_new ();
    zmq_ctx_set (ctx, ZMQ_MAX_SOCKETS, no_of_sockets);
    std::vector <void*> sockets;

    while (true) {
        void *socket = zmq_socket (ctx, ZMQ_PAIR);
        if (!socket)
            break;
        sockets.push_back (socket);
    }
    assert ((int) sockets.size () < no_of_sockets);

    //  System is out of resources, further calls to zmq_socket should return NULL
    for (unsigned int i = 0; i < 10; ++i) {
        void *socket = zmq_socket (ctx, ZMQ_PAIR);
        assert (socket == NULL);
    }
    // Clean up.
    for (unsigned int i = 0; i < sockets.size (); ++i)
        zmq_close (sockets [i]);

    zmq_ctx_destroy (ctx);
}

void test_zmq_default_max ()
{
    //  Keep allocating sockets until we hit the default limit
    void *ctx = zmq_ctx_new ();
    std::vector<void*> sockets;

    while (true) {
        void *socket = zmq_socket (ctx, ZMQ_PAIR);
        if (!socket)
            break;
        sockets.push_back (socket);
    }
    //  We may stop sooner if system has fewer available sockets
    assert (sockets.size () <= ZMQ_MAX_SOCKETS_DFLT);

    //  Further calls to zmq_socket should return NULL
    for (unsigned int i = 0; i < 10; ++i) {
        void *socket = zmq_socket (ctx, ZMQ_PAIR);
        assert (socket == NULL);
    }

    //  Clean up
    for (unsigned int i = 0; i < sockets.size (); ++i)
        zmq_close (sockets [i]);

    zmq_ctx_destroy (ctx);
}

int main (void)
{
    setup_test_environment ();

    test_system_max ();
    test_zmq_default_max ();

    return 0;
}