itimerdecr        241 kern/kern_clock.c 		    itimerdecr(&pstats->p_timer[ITIMER_VIRTUAL], tick) == 0)
itimerdecr        244 kern/kern_clock.c 		    itimerdecr(&pstats->p_timer[ITIMER_PROF], tick) == 0)
itimerdecr        308 sys/time.h     int	itimerdecr(struct itimerval *itp, int usec);