/* 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 . */ #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 ; }