333 	int retVal;  in os_createmutex()  local
340 	retVal = semget(IPC_PRIVATE, 1, IPC_CREAT);  in os_createmutex()
341 	if (retVal == -1) {  in os_createmutex()
345 	*semid = retVal; /* save key of created semaphore */  in os_createmutex()
347 	retVal = semctl(*semid, 0, SETVAL, sem_union);  in os_createmutex()
348 	if (retVal == -1) {  in os_createmutex()
356 	int retVal;  in os_obtainmutex()  local
362 	retVal = semop(semid, &sem_b, 1);  in os_obtainmutex()
367 	int retVal;  in os_releasemutex()  local
373 	retVal = semop(semid, &sem_b, 1);  in os_releasemutex()
379 	int retVal;  in os_destroymutex()  local
382 	retVal = semctl(semid, 0, IPC_RMID, sem_union);  in os_destroymutex()