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beb7aa5d3d359b793e11bf106ee21dda92feef73
[musl]
/
src
/
thread
/
sem_trywait.c
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#include <semaphore.h>
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#include "pthread_impl.h"
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int sem_trywait(sem_t *sem)
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{
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if (a_fetch_add(sem->__val, -1) > 0) return 0;
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if (!a_fetch_add(sem->__val, 1) && sem->__val[1])
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__wake(sem->__val, 1, 0);
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errno = EAGAIN;
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return -1;
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}