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87 lines
2.8 KiB
C++
87 lines
2.8 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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#ifndef __ZMQ_MAILBOX_HPP_INCLUDED__
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#define __ZMQ_MAILBOX_HPP_INCLUDED__
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#include <stddef.h>
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#include "signaler.hpp"
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#include "fd.hpp"
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#include "config.hpp"
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#include "command.hpp"
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#include "ypipe.hpp"
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#include "mutex.hpp"
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#include "i_mailbox.hpp"
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namespace zmq
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{
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class mailbox_t ZMQ_FINAL : public i_mailbox
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{
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public:
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mailbox_t ();
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~mailbox_t ();
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fd_t get_fd () const;
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void send (const command_t &cmd_);
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int recv (command_t *cmd_, int timeout_);
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bool valid () const;
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#ifdef HAVE_FORK
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// close the file descriptors in the signaller. This is used in a forked
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// child process to close the file descriptors so that they do not interfere
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// with the context in the parent process.
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void forked () ZMQ_FINAL { _signaler.forked (); }
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#endif
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private:
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// The pipe to store actual commands.
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typedef ypipe_t<command_t, command_pipe_granularity> cpipe_t;
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cpipe_t _cpipe;
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// Signaler to pass signals from writer thread to reader thread.
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signaler_t _signaler;
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// There's only one thread receiving from the mailbox, but there
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// is arbitrary number of threads sending. Given that ypipe requires
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// synchronised access on both of its endpoints, we have to synchronise
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// the sending side.
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mutex_t _sync;
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// True if the underlying pipe is active, ie. when we are allowed to
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// read commands from it.
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bool _active;
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ZMQ_NON_COPYABLE_NOR_MOVABLE (mailbox_t)
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};
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}
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#endif
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