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🎥 Command line media player
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C
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105/* * 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