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81 lines
2.3 KiB
C++
81 lines
2.3 KiB
C++
/*
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Copyright (c) 2007-2014 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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#ifndef __ZMQ_SIGNALER_HPP_INCLUDED__
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#define __ZMQ_SIGNALER_HPP_INCLUDED__
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#ifdef HAVE_FORK
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#include <unistd.h>
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#endif
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#include "fd.hpp"
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namespace zmq
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{
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// This is a cross-platform equivalent to signal_fd. However, as opposed
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// to signal_fd there can be at most one signal in the signaler at any
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// given moment. Attempt to send a signal before receiving the previous
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// one will result in undefined behaviour.
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class signaler_t
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{
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public:
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signaler_t ();
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~signaler_t ();
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fd_t get_fd () const;
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void send ();
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int wait (int timeout_);
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void recv ();
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#ifdef HAVE_FORK
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// close the file descriptors in a forked child process so that they
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// do not interfere with the context in the parent process.
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void forked ();
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#endif
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private:
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// Creates a pair of filedescriptors that will be used
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// to pass the signals.
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static int make_fdpair (fd_t *r_, fd_t *w_);
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// Underlying write & read file descriptor
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// Will be -1 if we exceeded number of available handles
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fd_t w;
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fd_t r;
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// Disable copying of signaler_t object.
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signaler_t (const signaler_t&);
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const signaler_t &operator = (const signaler_t&);
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#ifdef HAVE_FORK
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// the process that created this context. Used to detect forking.
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pid_t pid;
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// idempotent close of file descriptors that is safe to use by destructor
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// and forked().
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void close_internal ();
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#endif
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};
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}
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#endif
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