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/*
Copyright (c) 2010-2012 250bpm s.r.o.
Copyright (c) 2010-2011 Other contributors as noted in the AUTHORS file
This file is part of Crossroads I/O project.
Crossroads I/O is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
Crossroads 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/>.
*/
#ifndef __XS_SIGNALER_HPP_INCLUDED__
#define __XS_SIGNALER_HPP_INCLUDED__
#include "fd.hpp"
#include "polling.hpp"
// On AIX, poll.h has to be included before xs.h to get consistent
// definition of pollfd structure (AIX uses 'reqevents' and 'retnevents'
// instead of 'events' and 'revents' and defines macros to map from POSIX-y
// names to AIX-specific names).
#if defined XS_USE_SYNC_POLL
# if HAVE_SYS_TYPES
# include <sys/types.h>
# endif
# if HAVE_SYS_SELECT_H
# include <sys/select.h>
# endif
# if HAVE_POLL_H
# include <poll.h>
# elif HAVE_SYS_POLL_H
# include <sys/poll.h>
# endif
#elif defined XS_USE_SYNC_SELECT
# if defined XS_HAVE_WINDOWS
# include "windows.hpp"
# else
# if HAVE_SYS_TYPES_H
# include <sys/types.h>
# endif
# if HAVE_SYS_TIME_H
# include <sys/time.h>
# endif
# if HAVE_TIME_H
# include <time.h>
# endif
# if HAVE_UNISTD_H
# include <unistd.h>
# endif
# if HAVE_SYS_SELECT_H
# include <sys/select.h>
# endif
# endif
#endif
namespace xs
{
// This is a cross-platform equivalent to signal_fd. However, as opposed
// to signal_fd there can be at most one signal in the signaler at any
// given moment. Attempt to send a signal before receiving the previous
// one will result in undefined behaviour.
typedef struct {
fd_t w;
fd_t r;
#if defined XS_USE_SYNC_SELECT
fd_set fds;
#endif
} signaler_t;
// Initialise the signaler.
int signaler_init (signaler_t *self_);
// Destroy the signaler.
void signaler_close (signaler_t *self_);
// Return file decriptor that you can poll on to get notified when
// signal is sent.
fd_t signaler_fd (signaler_t *self_);
// Send a signal.
void signaler_send (signaler_t *self_);
// Wait for a signal. up to timout_ milliseconds.
// The signale is *not* consumed by this function.
int signaler_wait (signaler_t *self_, int timeout_);
// Wait for and consume a signal.
void signaler_recv (signaler_t *self_);
}
#endif
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