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- /*
- Copyright (c) 2007-2016 Contributors as noted in the AUTHORS file
- This file is part of libzmq, the ZeroMQ core engine in C++.
- libzmq is free software; you can redistribute it and/or modify it under
- the terms of the GNU Lesser General Public License (LGPL) as published
- by the Free Software Foundation; either version 3 of the License, or
- (at your option) any later version.
- As a special exception, the Contributors give you permission to link
- this library with independent modules to produce an executable,
- regardless of the license terms of these independent modules, and to
- copy and distribute the resulting executable under terms of your choice,
- provided that you also meet, for each linked independent module, the
- terms and conditions of the license of that module. An independent
- module is a module which is not derived from or based on this library.
- If you modify this library, you must extend this exception to your
- version of the library.
- libzmq 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 "precompiled.hpp"
- #include "macros.hpp"
- #include "pair.hpp"
- #include "err.hpp"
- #include "pipe.hpp"
- #include "msg.hpp"
- zmq::pair_t::pair_t (class ctx_t *parent_, uint32_t tid_, int sid_) :
- socket_base_t (parent_, tid_, sid_),
- _pipe (NULL),
- _last_in (NULL)
- {
- options.type = ZMQ_PAIR;
- }
- zmq::pair_t::~pair_t ()
- {
- zmq_assert (!_pipe);
- }
- void zmq::pair_t::xattach_pipe (pipe_t *pipe_,
- bool subscribe_to_all_,
- bool locally_initiated_)
- {
- LIBZMQ_UNUSED (subscribe_to_all_);
- LIBZMQ_UNUSED (locally_initiated_);
- zmq_assert (pipe_ != NULL);
- // ZMQ_PAIR socket can only be connected to a single peer.
- // The socket rejects any further connection requests.
- if (_pipe == NULL)
- _pipe = pipe_;
- else
- pipe_->terminate (false);
- }
- void zmq::pair_t::xpipe_terminated (pipe_t *pipe_)
- {
- if (pipe_ == _pipe) {
- if (_last_in == _pipe) {
- _last_in = NULL;
- }
- _pipe = NULL;
- }
- }
- void zmq::pair_t::xread_activated (pipe_t *)
- {
- // There's just one pipe. No lists of active and inactive pipes.
- // There's nothing to do here.
- }
- void zmq::pair_t::xwrite_activated (pipe_t *)
- {
- // There's just one pipe. No lists of active and inactive pipes.
- // There's nothing to do here.
- }
- int zmq::pair_t::xsend (msg_t *msg_)
- {
- if (!_pipe || !_pipe->write (msg_)) {
- errno = EAGAIN;
- return -1;
- }
- if (!(msg_->flags () & msg_t::more))
- _pipe->flush ();
- // Detach the original message from the data buffer.
- const int rc = msg_->init ();
- errno_assert (rc == 0);
- return 0;
- }
- int zmq::pair_t::xrecv (msg_t *msg_)
- {
- // Deallocate old content of the message.
- int rc = msg_->close ();
- errno_assert (rc == 0);
- if (!_pipe || !_pipe->read (msg_)) {
- // Initialise the output parameter to be a 0-byte message.
- rc = msg_->init ();
- errno_assert (rc == 0);
- errno = EAGAIN;
- return -1;
- }
- _last_in = _pipe;
- return 0;
- }
- bool zmq::pair_t::xhas_in ()
- {
- if (!_pipe)
- return false;
- return _pipe->check_read ();
- }
- bool zmq::pair_t::xhas_out ()
- {
- if (!_pipe)
- return false;
- return _pipe->check_write ();
- }
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