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LibPthread: Implement sem_getvalue()

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This commit is contained in:
Gunnar Beutner 2021-04-14 22:54:33 +02:00 • committed by Andreas Kling
parent a44ddc4793
commit b3eb55ec9a
1 changed files with 18 additions and 2 deletions
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20
Userland/Libraries/LibPthread/semaphore.cpp
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@ -51,9 +51,25 @@ int sem_destroy(sem_t* sem)
return 0;
}
int sem_getvalue(sem_t*, int*)
int sem_getvalue(sem_t* sem, int* sval)
{
VERIFY_NOT_REACHED();
auto rc = pthread_mutex_trylock(&sem->mtx);
if (rc == EBUSY) {
*sval = 0;
return 0;
}
if (rc != 0) {
errno = rc;
return -1;
}
*sval = sem->value;
pthread_mutex_unlock(&sem->mtx);
return 0;
}
int sem_init(sem_t* sem, int shared, unsigned int value)