FFmpeg/libavutil/thread.h

/*
 * This file is part of FFmpeg.
 *
 * FFmpeg 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 2.1 of the License, or (at your option) any later version.
 *
 * FFmpeg 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 FFmpeg; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

// This header should only be used to simplify code where
// threading is optional, not as a generic threading abstraction.

#ifndef AVUTIL_THREAD_H
#define AVUTIL_THREAD_H

#include "config.h"

#if HAVE_PTHREADS || HAVE_W32THREADS || HAVE_OS2THREADS

#define USE_ATOMICS 0

#if HAVE_PTHREADS
#include <pthread.h>
#elif HAVE_OS2THREADS
#include "compat/os2threads.h"
#else
#include "compat/w32pthreads.h"
#endif

#define AVMutex pthread_mutex_t

#define ff_mutex_init    pthread_mutex_init
#define ff_mutex_lock    pthread_mutex_lock
#define ff_mutex_unlock  pthread_mutex_unlock
#define ff_mutex_destroy pthread_mutex_destroy

#define AVOnce pthread_once_t
#define AV_ONCE_INIT PTHREAD_ONCE_INIT

#define ff_thread_once(control, routine) pthread_once(control, routine)

#else

#define USE_ATOMICS 1

#define AVMutex char

#define ff_mutex_init(mutex, attr) (0)
#define ff_mutex_lock(mutex) (0)
#define ff_mutex_unlock(mutex) (0)
#define ff_mutex_destroy(mutex) (0)

#define AVOnce char
#define AV_ONCE_INIT 0

static inline int ff_thread_once(char *control, void (*routine)(void))
{
    if (!*control) {
        routine();
        *control = 1;
    }
    return 0;
}

#endif

#endif /* AVUTIL_THREAD_H */