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fix some semaphore wait semantics (race condition deadlock and error checking)
[musl]
/
src
/
thread
/
sem_trywait.c
1
#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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int val = a_fetch_add(sem->__val, -1);
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if (val > 0) return 0;
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if (!a_fetch_add(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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}