2012-03-16 16:39:11 -05:00
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/*
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Copyright (c) 2007-2011 iMatix Corporation
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Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
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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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2012-06-05 09:15:37 -05:00
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#include "platform.hpp"
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#if defined ZMQ_FORCE_SELECT
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#define ZMQ_POLL_BASED_ON_SELECT
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#elif defined ZMQ_FORCE_POLL
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#define ZMQ_POLL_BASED_ON_POLL
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#elif defined ZMQ_HAVE_LINUX || defined ZMQ_HAVE_FREEBSD ||\
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defined ZMQ_HAVE_OPENBSD || defined ZMQ_HAVE_SOLARIS ||\
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defined ZMQ_HAVE_OSX || defined ZMQ_HAVE_QNXNTO ||\
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defined ZMQ_HAVE_HPUX || defined ZMQ_HAVE_AIX ||\
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defined ZMQ_HAVE_NETBSD
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#define ZMQ_POLL_BASED_ON_POLL
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#elif defined ZMQ_HAVE_WINDOWS || defined ZMQ_HAVE_OPENVMS ||\
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defined ZMQ_HAVE_CYGWIN
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#define ZMQ_POLL_BASED_ON_SELECT
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#endif
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// On AIX platform, poll.h has to be included first to get consistent
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// definition of pollfd structure (AIX uses 'reqevents' and 'retnevents'
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// instead of 'events' and 'revents' and defines macros to map from POSIX-y
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// names to AIX-specific names).
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#if defined ZMQ_POLL_BASED_ON_POLL
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#include <poll.h>
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#endif
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2012-03-16 16:39:11 -05:00
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#include "../include/zmq.h"
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#include "device.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::device (class socket_base_t *insocket_,
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class socket_base_t *outsocket_)
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{
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msg_t msg;
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int rc = msg.init ();
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2012-04-18 13:14:07 -05:00
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if (rc != 0)
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2012-03-16 16:39:11 -05:00
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return -1;
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2012-04-25 10:43:00 +02:00
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// The algorithm below assumes ratio of requests and replies processed
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2012-04-18 13:14:07 -05:00
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// under full load to be 1:1.
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2012-04-25 10:43:00 +02:00
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// TODO: The current implementation drops messages when
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// any of the pipes becomes full.
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2012-04-18 13:14:07 -05:00
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int more;
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2012-03-16 16:39:11 -05:00
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size_t moresz;
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2012-04-18 13:14:07 -05:00
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zmq_pollitem_t items [] = {
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{ insocket_, 0, ZMQ_POLLIN, 0 },
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{ outsocket_, 0, ZMQ_POLLIN, 0 }
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};
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2012-03-16 16:39:11 -05:00
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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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2012-04-18 13:14:07 -05:00
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if (unlikely (rc < 0))
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2012-03-16 16:39:11 -05:00
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return -1;
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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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2012-04-18 13:14:07 -05:00
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if (unlikely (rc < 0))
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2012-03-16 16:39:11 -05:00
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return -1;
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2012-04-25 10:43:00 +02:00
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moresz = sizeof more;
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2012-03-16 16:39:11 -05:00
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rc = insocket_->getsockopt (ZMQ_RCVMORE, &more, &moresz);
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2012-04-18 13:14:07 -05:00
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if (unlikely (rc < 0))
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2012-03-16 16:39:11 -05:00
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return -1;
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2012-04-25 10:43:00 +02:00
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2012-04-18 13:14:07 -05:00
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rc = outsocket_->send (&msg, more? ZMQ_SNDMORE: 0);
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if (unlikely (rc < 0))
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2012-03-16 16:39:11 -05:00
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return -1;
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2012-04-18 13:14:07 -05:00
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if (more == 0)
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2012-03-16 16:39:11 -05:00
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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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2012-04-18 13:14:07 -05:00
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if (unlikely (rc < 0))
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2012-03-16 16:39:11 -05:00
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return -1;
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2012-04-25 10:43:00 +02:00
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moresz = sizeof more;
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2012-03-16 16:39:11 -05:00
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rc = outsocket_->getsockopt (ZMQ_RCVMORE, &more, &moresz);
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2012-04-18 13:14:07 -05:00
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if (unlikely (rc < 0))
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2012-03-16 16:39:11 -05:00
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return -1;
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2012-04-25 10:43:00 +02:00
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2012-04-18 13:14:07 -05:00
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rc = insocket_->send (&msg, more? ZMQ_SNDMORE: 0);
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if (unlikely (rc < 0))
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2012-03-16 16:39:11 -05:00
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return -1;
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2012-04-18 13:14:07 -05:00
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if (more == 0)
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2012-03-16 16:39:11 -05:00
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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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