mirror of
https://github.com/mpv-player/mpv
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39 lines
871 B
C
39 lines
871 B
C
#ifndef MP_SEMAPHORE_H_
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#define MP_SEMAPHORE_H_
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#ifdef __APPLE__
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#include <sys/types.h>
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#include <semaphore.h>
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// macOS 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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#define MP_SEMAPHORE_EMULATION
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#include "osdep/threads.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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mp_mutex 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, int64_t until);
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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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#endif
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#endif
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