schedule_hrtimeout_range
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## 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

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