mpv/compat/atomics.h

/*
 * This file is part of mpv.
 * Copyright (c) 2013 Stefano Pigozzi <stefano.pigozzi@gmail.com>
 *
 * mpv is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * mpv 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with mpv.  If not, see <http://www.gnu.org/licenses/>.
 */

// At this point both gcc and clang had __sync_synchronize support for some
// time. We only support a full memory barrier.

#include "config.h"

#if HAVE_ATOMIC_BUILTINS
# define mp_memory_barrier()           __atomic_thread_fence(__ATOMIC_SEQ_CST)
# define mp_atomic_add_and_fetch(a, b) __atomic_add_fetch(a, b,__ATOMIC_SEQ_CST)
#elif HAVE_SYNC_BUILTINS
# define mp_memory_barrier()           __sync_synchronize()
# define mp_atomic_add_and_fetch(a, b) __sync_add_and_fetch(a, b)
#else
# error "this should have been a configuration error, report a bug please"
#endif