schedule_hrtimeout_range(9) [centos man page]
SCHEDULE_HRTIMEOUT_R(9) Driver Basics SCHEDULE_HRTIMEOUT_R(9) NAME
schedule_hrtimeout_range - sleep until timeout SYNOPSIS
int __sched schedule_hrtimeout_range(ktime_t * expires, unsigned long delta, const enum hrtimer_mode mode); ARGUMENTS
expires timeout value (ktime_t) delta slack in expires timeout (ktime_t) mode timer mode, HRTIMER_MODE_ABS or HRTIMER_MODE_REL DESCRIPTION
Make the current task sleep until the given expiry time has elapsed. The routine will return immediately unless the current task state has been set (see set_current_state). The delta argument gives the kernel the freedom to schedule the actual wakeup to a time that is both power and performance friendly. The kernel give the normal best effort behavior for "expires+delta", but may decide to fire the timer earlier, but no earlier than expires. You can set the task state as follows - TASK_UNINTERRUPTIBLE - at least timeout time is guaranteed to pass before the routine returns. TASK_INTERRUPTIBLE - the routine may return early if a signal is delivered to the current task. The current task state is guaranteed to be TASK_RUNNING when this routine returns. Returns 0 when the timer has expired otherwise -EINTR COPYRIGHT
Kernel Hackers Manual 3.10 June 2014 SCHEDULE_HRTIMEOUT_R(9)
Check Out this Related Man Page
sleep(3) Library Functions Manual sleep(3) Name sleep - suspend execution for interval Syntax unsigned sleep(seconds) unsigned seconds; Description The current process is suspended from execution for the number of seconds specified by the argument. The actual suspension time may be up to 1 second less than that requested, because scheduled wakeups occur at fixed 1-second intervals, and an arbitrary amount longer because of other activity in the system. The routine is implemented by setting an interval timer and pausing until it occurs. The previous state of this timer is saved and restored. If the sleep time exceeds the time to the expiration of the previous timer, the process sleeps only until the signal would have occurred, and the signal is sent 1 second later. Return Values The value returned by is the unslept amount(the requested time minus the time actually slept). This return value may be non-zero in cases where the caller had an alarm set to go off earlier than the end of the requested time, or where was interrupted due to a caught signal(see ENVIRONMENT below). Environment POSIX SYSTEM_FIVE When your program is compiled in POSIX or System V mode, the will be terminated by any caught signal. The function will return following execution of the signal's catching routine. See Also setitimer(2), sigpause(2) sleep(3)