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🎥 Command line media player
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12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455565758596061626364656667686970717273747576777879808182838485868788899091929394/* * 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;#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;
#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_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