USLEEP_RANGE(9)                           Driver Basics                           USLEEP_RANGE(9)



NAME
       usleep_range - Sleep for an approximate time

SYNOPSIS
       void __sched usleep_range(unsigned long min, unsigned long max);

ARGUMENTS
       min
           Minimum time in usecs to sleep

       max
           Maximum time in usecs to sleep

DESCRIPTION
       In non-atomic context where the exact wakeup time is flexible, use usleep_range instead of
       udelay. The sleep improves responsiveness by avoiding the CPU-hogging busy-wait of udelay,
       and the range reduces power usage by allowing hrtimers to take advantage of an already-
       scheduled interrupt instead of scheduling a new one just for this sleep.

COPYRIGHT
Kernel Hackers Manual 4.8.                 January 2017                           USLEEP_RANGE(9)