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/*
* 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 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.
*
* 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with mpv. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef MP_ATOMIC_H
#define MP_ATOMIC_H
#include <inttypes.h>
#include "config.h"
#if HAVE_STDATOMIC
#include <stdatomic.h>
typedef _Atomic float mp_atomic_float;
typedef _Atomic int64_t mp_atomic_int64;
typedef _Atomic uint64_t mp_atomic_uint64;
#else
// Emulate the parts of C11 stdatomic.h needed by mpv.
typedef struct { unsigned long v; } atomic_ulong;
typedef struct { int v; } atomic_int;
typedef struct { unsigned int v; } atomic_uint;
typedef struct { _Bool v; } atomic_bool;
typedef struct { long long v; } atomic_llong;
typedef struct { uint_least32_t v; } atomic_uint_least32_t;
typedef struct { unsigned long long v; } atomic_ullong;
typedef struct { float v; } mp_atomic_float;
typedef struct { int64_t v; } mp_atomic_int64;
typedef struct { uint64_t v; } mp_atomic_uint64;
#define ATOMIC_VAR_INIT(x) \
{.v = (x)}
#define memory_order_relaxed 1
#define memory_order_seq_cst 2
#define atomic_load_explicit(p, e) atomic_load(p)
#include <pthread.h>
extern pthread_mutex_t mp_atomic_mutex;
#define atomic_load(p) \
({ __typeof__(p) p_ = (p); \
pthread_mutex_lock(&mp_atomic_mutex); \
__typeof__(p_->v) v_ = p_->v; \
pthread_mutex_unlock(&mp_atomic_mutex); \
v_; })
#define atomic_store(p, val) \
({ __typeof__(val) val_ = (val); \
__typeof__(p) p_ = (p); \
pthread_mutex_lock(&mp_atomic_mutex); \
p_->v = val_; \
pthread_mutex_unlock(&mp_atomic_mutex); })
#define atomic_fetch_op(a, b, op) \
({ __typeof__(a) a_ = (a); \
__typeof__(b) b_ = (b); \
pthread_mutex_lock(&mp_atomic_mutex); \
__typeof__(a_->v) v_ = a_->v; \
a_->v = v_ op b_; \
pthread_mutex_unlock(&mp_atomic_mutex); \
v_; })
#define atomic_fetch_add(a, b) atomic_fetch_op(a, b, +)
#define atomic_fetch_and(a, b) atomic_fetch_op(a, b, &)
#define atomic_fetch_or(a, b) atomic_fetch_op(a, b, |)
#define atomic_exchange(p, new) \
({ __typeof__(p) p_ = (p); \
pthread_mutex_lock(&mp_atomic_mutex); \
__typeof__(p_->v) res_ = p_->v; \
p_->v = (new); \
pthread_mutex_unlock(&mp_atomic_mutex); \
res_; })
#define atomic_compare_exchange_strong(p, old, new) \
({ __typeof__(p) p_ = (p); \
__typeof__(old) old_ = (old); \
__typeof__(new) new_ = (new); \
pthread_mutex_lock(&mp_atomic_mutex); \
int res_ = p_->v == *old_; \
if (res_) { \
p_->v = new_; \
} else { \
*old_ = p_->v; \
} \
pthread_mutex_unlock(&mp_atomic_mutex); \
res_; })
#endif /* else HAVE_STDATOMIC */
#endif
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