mirror of
https://github.com/zeromq/libzmq.git
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b358df9fff
Signed-off-by: Martin Sustrik <sustrik@250bpm.com>
131 lines
3.7 KiB
C++
131 lines
3.7 KiB
C++
/*
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Copyright (c) 2007-2010 iMatix Corporation
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This file is part of 0MQ.
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0MQ is free software; you can redistribute it and/or modify it under
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the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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0MQ is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <stddef.h>
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#include "../include/zmq.h"
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#include "queue.hpp"
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#include "socket_base.hpp"
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#include "likely.hpp"
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#include "err.hpp"
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int zmq::queue (class socket_base_t *insocket_,
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class socket_base_t *outsocket_)
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{
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zmq_msg_t msg;
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int rc = zmq_msg_init (&msg);
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zmq_assert (rc == 0);
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int64_t more;
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size_t moresz;
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zmq_pollitem_t items [2];
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items [0].socket = insocket_;
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items [0].fd = 0;
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items [0].events = ZMQ_POLLIN;
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items [0].revents = 0;
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items [1].socket = outsocket_;
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items [1].fd = 0;
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items [1].events = ZMQ_POLLIN;
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items [1].revents = 0;
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while (true) {
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// Wait while there are either requests or replies to process.
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rc = zmq_poll (&items [0], 2, -1);
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if (unlikely (rc < 0)) {
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if (errno == ETERM)
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return -1;
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errno_assert (false);
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}
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// The algorithm below asumes ratio of request and replies processed
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// under full load to be 1:1. Although processing requests replies
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// first is tempting it is suspectible to DoS attacks (overloading
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// the system with unsolicited replies).
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// Process a request.
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if (items [0].revents & ZMQ_POLLIN) {
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while (true) {
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rc = insocket_->recv (&msg, 0);
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if (unlikely (rc < 0)) {
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if (errno == ETERM)
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return -1;
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errno_assert (false);
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}
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moresz = sizeof (more);
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rc = insocket_->getsockopt (ZMQ_RCVMORE, &more, &moresz);
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if (unlikely (rc < 0)) {
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if (errno == ETERM)
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return -1;
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errno_assert (false);
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}
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rc = outsocket_->send (&msg, more ? ZMQ_SNDMORE : 0);
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if (unlikely (rc < 0)) {
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if (errno == ETERM)
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return -1;
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errno_assert (false);
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}
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if (!more)
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break;
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}
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}
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// Process a reply.
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if (items [1].revents & ZMQ_POLLIN) {
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while (true) {
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rc = outsocket_->recv (&msg, 0);
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if (unlikely (rc < 0)) {
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if (errno == ETERM)
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return -1;
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errno_assert (false);
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}
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moresz = sizeof (more);
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rc = outsocket_->getsockopt (ZMQ_RCVMORE, &more, &moresz);
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if (unlikely (rc < 0)) {
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if (errno == ETERM)
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return -1;
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errno_assert (false);
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}
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rc = insocket_->send (&msg, more ? ZMQ_SNDMORE : 0);
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if (unlikely (rc < 0)) {
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if (errno == ETERM)
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return -1;
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errno_assert (false);
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}
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if (!more)
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break;
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}
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}
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}
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return 0;
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}
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