mirror of
https://github.com/mpv-player/mpv
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81efe20cd7
Using these was a temporary solution while some compilers implemented the underlying atomic mechanisms, but not the C11 language parts (or that's what I guess). Not really useful for us anymore. Also, there is the slight risk of having subtly incorrect semantics by using potentially changing compiler internals and such.
91 lines
3.5 KiB
C
91 lines
3.5 KiB
C
/*
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* This file is part of mpv.
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* Copyright (c) 2013 Stefano Pigozzi <stefano.pigozzi@gmail.com>
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*
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* mpv is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* mpv is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with mpv. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef MP_ATOMIC_H
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#define MP_ATOMIC_H
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#include <inttypes.h>
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#include "config.h"
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#if HAVE_STDATOMIC
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#include <stdatomic.h>
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#else
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// Emulate the parts of C11 stdatomic.h needed by mpv.
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typedef struct { unsigned long v; } atomic_ulong;
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typedef struct { int v; } atomic_int;
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typedef struct { unsigned int v; } atomic_uint;
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typedef struct { _Bool v; } atomic_bool;
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typedef struct { long long v; } atomic_llong;
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typedef struct { uint_least32_t v; } atomic_uint_least32_t;
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typedef struct { unsigned long long v; } atomic_ullong;
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#define ATOMIC_VAR_INIT(x) \
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{.v = (x)}
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#define memory_order_relaxed 1
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#define memory_order_seq_cst 2
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#define atomic_load_explicit(p, e) atomic_load(p)
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#include <pthread.h>
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extern pthread_mutex_t mp_atomic_mutex;
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#define atomic_load(p) \
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({ __typeof__(p) p_ = (p); \
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pthread_mutex_lock(&mp_atomic_mutex); \
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__typeof__(p_->v) v = p_->v; \
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pthread_mutex_unlock(&mp_atomic_mutex); \
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v; })
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#define atomic_store(p, val) \
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({ __typeof__(val) val_ = (val); \
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__typeof__(p) p_ = (p); \
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pthread_mutex_lock(&mp_atomic_mutex); \
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p_->v = val_; \
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pthread_mutex_unlock(&mp_atomic_mutex); })
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#define atomic_fetch_op(a, b, op) \
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({ __typeof__(a) a_ = (a); \
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__typeof__(b) b_ = (b); \
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pthread_mutex_lock(&mp_atomic_mutex); \
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__typeof__(a_->v) v = a_->v; \
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a_->v = v op b_; \
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pthread_mutex_unlock(&mp_atomic_mutex); \
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v; })
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#define atomic_fetch_add(a, b) atomic_fetch_op(a, b, +)
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#define atomic_fetch_and(a, b) atomic_fetch_op(a, b, &)
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#define atomic_fetch_or(a, b) atomic_fetch_op(a, b, |)
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#define atomic_compare_exchange_strong(p, old, new) \
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({ __typeof__(p) p_ = (p); \
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__typeof__(old) old_ = (old); \
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__typeof__(new) new_ = (new); \
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pthread_mutex_lock(&mp_atomic_mutex); \
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int res = p_->v == *old_; \
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if (res) { \
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p_->v = new_; \
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} else { \
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*old_ = p_->v; \
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} \
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pthread_mutex_unlock(&mp_atomic_mutex); \
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res; })
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#endif /* else HAVE_STDATOMIC */
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#endif
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