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a113434cd6
1. make sem_[timed]wait interruptible by signals, per POSIX 2. keep a waiter count in order to avoid unnecessary futex wake syscalls
12 lines
238 B
C
12 lines
238 B
C
#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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}
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