mirror of
https://github.com/zeromq/libzmq.git
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126 lines
3.8 KiB
C++
126 lines
3.8 KiB
C++
/*
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Copyright (c) 2007-2016 Contributors as noted in the AUTHORS file
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This file is part of libzmq, the ZeroMQ core engine in C++.
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libzmq 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 (LGPL) as published
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by 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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As a special exception, the Contributors give you permission to link
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this library with independent modules to produce an executable,
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regardless of the license terms of these independent modules, and to
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copy and distribute the resulting executable under terms of your choice,
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provided that you also meet, for each linked independent module, the
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terms and conditions of the license of that module. An independent
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module is a module which is not derived from or based on this library.
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If you modify this library, you must extend this exception to your
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version of the library.
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libzmq is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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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 "precompiled.hpp"
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#include "mailbox_safe.hpp"
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#include "clock.hpp"
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#include "err.hpp"
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#include <algorithm>
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zmq::mailbox_safe_t::mailbox_safe_t (mutex_t *sync_) : _sync (sync_)
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{
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// Get the pipe into passive state. That way, if the users starts by
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// polling on the associated file descriptor it will get woken up when
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// new command is posted.
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const bool ok = _cpipe.check_read ();
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zmq_assert (!ok);
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}
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zmq::mailbox_safe_t::~mailbox_safe_t ()
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{
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// TODO: Retrieve and deallocate commands inside the cpipe.
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// Work around problem that other threads might still be in our
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// send() method, by waiting on the mutex before disappearing.
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_sync->lock ();
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_sync->unlock ();
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}
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void zmq::mailbox_safe_t::add_signaler (signaler_t *signaler_)
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{
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_signalers.push_back (signaler_);
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}
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void zmq::mailbox_safe_t::remove_signaler (signaler_t *signaler_)
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{
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// TODO: make a copy of array and signal outside the lock
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const std::vector<zmq::signaler_t *>::iterator end = _signalers.end ();
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const std::vector<signaler_t *>::iterator it =
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std::find (_signalers.begin (), end, signaler_);
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if (it != end)
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_signalers.erase (it);
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}
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void zmq::mailbox_safe_t::clear_signalers ()
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{
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_signalers.clear ();
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}
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void zmq::mailbox_safe_t::send (const command_t &cmd_)
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{
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_sync->lock ();
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_cpipe.write (cmd_, false);
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const bool ok = _cpipe.flush ();
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if (!ok) {
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_cond_var.broadcast ();
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for (std::vector<signaler_t *>::iterator it = _signalers.begin (),
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end = _signalers.end ();
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it != end; ++it) {
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(*it)->send ();
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}
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}
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_sync->unlock ();
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}
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int zmq::mailbox_safe_t::recv (command_t *cmd_, int timeout_)
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{
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// Try to get the command straight away.
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if (_cpipe.read (cmd_))
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return 0;
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// If the timeout is zero, it will be quicker to release the lock, giving other a chance to send a command
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// and immediately relock it.
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if (timeout_ == 0) {
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_sync->unlock ();
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_sync->lock ();
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} else {
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// Wait for signal from the command sender.
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const int rc = _cond_var.wait (_sync, timeout_);
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if (rc == -1) {
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errno_assert (errno == EAGAIN || errno == EINTR);
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return -1;
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}
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}
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// Another thread may already fetch the command
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const bool ok = _cpipe.read (cmd_);
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if (!ok) {
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errno = EAGAIN;
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return -1;
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}
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return 0;
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}
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