55  * Sleep until *wakeup + interval, keeping cadence where desired
58  * interval -	We want to sleep until *wakeup + interval
63 sleep_until(hrtime_t *wakeup, hrtime_t interval, int forever,  in sleep_until()  argument
71 	pause = *wakeup + interval - now;  in sleep_until()
73 	if (pause <= 0 || pause < (interval / 4))  in sleep_until()
76 			*wakeup = now + interval;  in sleep_until()
77 			pause = interval;  in sleep_until()
83 			 * interval AND the number of intervals has been  in sleep_until()
88 			 * interval this time.  in sleep_until()
90 			pause = interval / 2;  in sleep_until()
91 			*wakeup += interval;  in sleep_until()
94 		*wakeup += interval;  in sleep_until()