119 static int os_createmutex(int *semid);
120 static void os_obtainmutex(int semid);
121 static void os_releasemutex(int semid);
122 static void os_destroymutex(int semid);
331 static int os_createmutex(int *semid) {  in os_createmutex()  argument
335 	if (semid == NULL) {  in os_createmutex()
344 	*semid = retVal; /* save key of created semaphore */  in os_createmutex()
346 	retVal = semctl(*semid, 0, SETVAL, sem_union);  in os_createmutex()
354 static void os_obtainmutex(int semid) {  in os_obtainmutex()  argument
361 	retVal = semop(semid, &sem_b, 1);  in os_obtainmutex()
365 static void os_releasemutex(int semid) {  in os_releasemutex()  argument
372 	retVal = semop(semid, &sem_b, 1);  in os_releasemutex()
377 static void os_destroymutex(int semid) {  in os_destroymutex()  argument
381 	retVal = semctl(semid, 0, IPC_RMID, sem_union);  in os_destroymutex()