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I suggest a new sys SysV-semaphore API :
 sys.semget( sem_key, sem_nsems, sem_flags)
 sys.SEM_KEY_ANY = 0
 sys.SEM_UNDO = 0x1000 /*chain of atomic kernel UNDO operations*/ 
 sys.SEM_GETPID = 11 /* get sempid */
 sys.SEM_GETVAL = 12 /* get semval */
 sys.SEM_GETALL = 13 /* get all semval's */
 sys.SEM_GETNCNT = 14 /* get semncnt */
 sys.SEM_GETZCNT = 15 /* get semzcnt */
 sys.SEM_SETVAL = 16 /* set semval */
 sys.SEM_SETALL = 17 /* set all semval's */
#if ( ! defined(__sun__) ) || defined ( __GNU__ )
 sys.SEM_STAT = 18
 sys.SEM_INFO = 19
#endif
 
 sys.semop(semid, sops, nsops)
 sys.semtimedop(semid, sops, nsops,
 timeout
 )
 
 sys.semctl(semid, semnum, cmd, ...);