libzmq/tests/test_many_sockets.cpp

/*
    Copyright (c) 2007-2013 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(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 zeromq 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);
    }

    assert(sockets.size() == ZMQ_MAX_SOCKETS_DFLT);

    // At zeromq max, 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;
}