mirror of https://github.com/mpv-player/mpv
59 lines
1.4 KiB
C
59 lines
1.4 KiB
C
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#ifndef MP_SEMAPHORE_H_
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#define MP_SEMAPHORE_H_
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#include <semaphore.h>
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// OSX provides non-working empty stubs, so we emulate them.
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// This should be AS-safe, but cancellation issues were ignored.
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// sem_getvalue() is not provided.
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// sem_post() won't always correctly return an error on overflow.
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// Process-shared semantics are not provided.
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#ifdef __APPLE__
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#define MP_SEMAPHORE_EMULATION
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#include <pthread.h>
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#define MP_SEM_VALUE_MAX 4096
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typedef struct {
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int wakeup_pipe[2];
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pthread_mutex_t lock;
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// protected by lock
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unsigned int count;
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} mp_sem_t;
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int mp_sem_init(mp_sem_t *sem, int pshared, unsigned int value);
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int mp_sem_wait(mp_sem_t *sem);
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int mp_sem_trywait(mp_sem_t *sem);
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int mp_sem_timedwait(mp_sem_t *sem, const struct timespec *abs_timeout);
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int mp_sem_post(mp_sem_t *sem);
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int mp_sem_destroy(mp_sem_t *sem);
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#undef sem_init
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#undef sem_wait
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#undef sem_trywait
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#undef sem_timedwait
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#undef sem_post
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#undef sem_getvalue
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#undef sem_destroy
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#undef sem_getvalue
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#undef sem_t
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#undef SEM_VALUE_MAX
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#define sem_init mp_sem_init
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#define sem_wait mp_sem_wait
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#define sem_trywait mp_sem_trywait
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#define sem_timedwait mp_sem_timedwait
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#define sem_post mp_sem_post
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#define sem_destroy mp_sem_destroy
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#define sem_t mp_sem_t
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#define SEM_VALUE_MAX MP_SEM_VALUE_MAX
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#define sem_getvalue (void)
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#endif
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#endif
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