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26120950e2
this is not required by the standard, but it's nicer than corrupting the state and rather inexpensive.
18 lines
341 B
C
18 lines
341 B
C
#include <semaphore.h>
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#include "pthread_impl.h"
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int sem_post(sem_t *sem)
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{
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int val, waiters;
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do {
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val = sem->__val[0];
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waiters = sem->__val[1];
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if (val == SEM_VALUE_MAX) {
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errno = EOVERFLOW;
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return -1;
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}
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} while (a_cas(sem->__val, val, val+1+(val<0)) != val);
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if (val<0 || waiters) __wake(sem->__val, 1, 0);
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return 0;
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}
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