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/*
Copyright (c) 2007-2010 iMatix Corporation
This file is part of 0MQ.
0MQ is free software; you can redistribute it and/or modify it under
the terms of the Lesser GNU 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
Lesser GNU General Public License for more details.
You should have received a copy of the Lesser GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "../include/zmq.h"
#include "queue.hpp"
#include "socket_base.hpp"
#include "err.hpp"
int zmq::queue (class socket_base_t *insocket_,
class socket_base_t *outsocket_)
{
zmq_msg_t request_msg;
int rc = zmq_msg_init (&request_msg);
errno_assert (rc == 0);
bool has_request = false;
zmq_msg_t response_msg;
rc = zmq_msg_init (&response_msg);
errno_assert (rc == 0);
bool has_response = false;
zmq_pollitem_t items [2];
items [0].socket = insocket_;
items [0].fd = 0;
items [0].events = ZMQ_POLLIN;
items [0].revents = 0;
items [1].socket = outsocket_;
items [1].fd = 0;
items [1].events = ZMQ_POLLIN;
items [1].revents = 0;
while (true) {
rc = zmq_poll (&items [0], 2, -1);
errno_assert (rc > 0);
// The algorithm below asumes ratio of request and replies processed
// under full load to be 1:1. The alternative would be to process
// replies first, handle request only when there are no more replies.
// Receive a new request.
if (items [0].revents & ZMQ_POLLIN) {
zmq_assert (!has_request);
rc = insocket_->recv (&request_msg, ZMQ_NOBLOCK);
errno_assert (rc == 0);
items [0].events &= ~ZMQ_POLLIN;
items [1].events |= ZMQ_POLLOUT;
has_request = true;
}
// Send the request further.
if (items [1].revents & ZMQ_POLLOUT) {
zmq_assert (has_request);
rc = outsocket_->send (&request_msg, ZMQ_NOBLOCK);
errno_assert (rc == 0);
items [0].events |= ZMQ_POLLIN;
items [1].events &= ~ZMQ_POLLOUT;
has_request = false;
}
// Get a new reply.
if (items [1].revents & ZMQ_POLLIN) {
zmq_assert (!has_response);
rc = outsocket_->recv (&response_msg, ZMQ_NOBLOCK);
errno_assert (rc == 0);
items [0].events |= ZMQ_POLLOUT;
items [1].events &= ~ZMQ_POLLIN;
has_response = true;
}
// Send the reply further.
if (items [0].revents & ZMQ_POLLOUT) {\
zmq_assert (has_response);
rc = insocket_->send (&response_msg, ZMQ_NOBLOCK);
errno_assert (rc == 0);
items [0].events &= ~ZMQ_POLLOUT;
items [1].events |= ZMQ_POLLIN;
has_response = false;
}
}
return 0;
}
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