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https://github.com/mpv-player/mpv
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osdep: drop atomic fallback
even msvc (which mpv apparently doesn't support) supports C11 atomics now. no need to carry around fallback with subtle semantic differences.
This commit is contained in:
NRK
sfan5
parent
3fb4eb2ba4
commit
2fa695c3f9
@ -434,8 +434,7 @@ See generally available literature. In mpv, we use pthread for this.
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Always keep locking clean. Don't skip locking just because it will work "in
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practice". (See undefined behavior section.) If your use case is simple, you may
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use C11 atomics (osdep/atomic.h for partial C99 support), but most likely you
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will only hurt yourself and others.
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use C11 atomics, but most likely you will only hurt yourself and others.
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Always make clear which fields in a struct are protected by which lock. If a
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field is immutable, or simply not thread-safe (e.g. state for a single worker
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10
meson.build
10
meson.build
@ -333,6 +333,9 @@ if features['libdl']
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dependencies += libdl
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endif
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# C11 atomics are mandatory but linking to the library is not always required.
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dependencies += cc.find_library('atomic', required: false)
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cplugins = get_option('cplugins').require(
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win32 or (features['libdl'] and cc.has_link_argument('-rdynamic')),
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error_message: 'cplugins not supported by the os or compiler!',
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@ -731,13 +734,6 @@ if features['sdl2-gamepad']
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sources += files('input/sdl_gamepad.c')
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endif
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stdatomic_dep = cc.find_library('atomic', required: false)
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features += {'stdatomic': cc.has_header_symbol('stdatomic.h', 'atomic_int', dependencies: stdatomic_dep,
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required: get_option('stdatomic'))}
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if features['stdatomic']
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dependencies += stdatomic_dep
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endif
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uchardet_opt = get_option('uchardet').require(
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features['iconv'],
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error_message: 'iconv was not found!',
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@ -30,7 +30,6 @@ option('pthread-debug', type: 'feature', value: 'disabled', description: 'pthrea
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option('rubberband', type: 'feature', value: 'auto', description: 'librubberband support')
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option('sdl2', type: 'feature', value: 'disabled', description: 'SDL2')
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option('sdl2-gamepad', type: 'feature', value: 'auto', description: 'SDL2 gamepad input')
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option('stdatomic', type: 'feature', value: 'auto', description: 'C11 stdatomic.h')
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option('uchardet', type: 'feature', value: 'auto', description: 'uchardet support')
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option('uwp', type: 'feature', value: 'disabled', description: 'Universal Windows Platform')
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option('vapoursynth', type: 'feature', value: 'auto', description: 'VapourSynth filter bridge')
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@ -22,90 +22,10 @@
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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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typedef _Atomic float mp_atomic_float;
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typedef _Atomic double mp_atomic_double;
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typedef _Atomic int64_t mp_atomic_int64;
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typedef _Atomic uint64_t mp_atomic_uint64;
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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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typedef struct { float v; } mp_atomic_float;
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typedef struct { double v; } mp_atomic_double;
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typedef struct { int64_t v; } mp_atomic_int64;
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typedef struct { uint64_t v; } mp_atomic_uint64;
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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 memory_order_acq_rel 3
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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_exchange(p, new) \
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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) res_ = p_->v; \
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p_->v = (new); \
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pthread_mutex_unlock(&mp_atomic_mutex); \
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res_; })
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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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#define atomic_load_explicit(a, b) \
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atomic_load(a)
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#define atomic_exchange_explicit(a, b, c) \
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atomic_exchange(a, b)
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#endif /* else HAVE_STDATOMIC */
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#endif
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@ -80,10 +80,6 @@ static const char def_config[] =
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#define FULLCONFIG "(missing)\n"
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#endif
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#if !HAVE_STDATOMIC
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pthread_mutex_t mp_atomic_mutex = PTHREAD_MUTEX_INITIALIZER;
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#endif
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enum exit_reason {
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EXIT_NONE,
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EXIT_NORMAL,
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