NAME

       rtapi_delay - Busy-loop for short delays

SYNTAX

       void rtapi_delay(long int nsec)

       void rtapi_delay_max()

ARGUMENTS

       nsec   The desired delay length in nanoseconds

DESCRIPTION

       rtapi_delay  is  a  simple  delay.   It is intended only for short delays, since it simply
       loops, wasting CPU cycles.

       rtapi_delay_max returns the max delay permitted (usually approximately 1/4  of  the  clock
       period).   Any  call  to rtapi_delay requesting a delay longer than the max will delay for
       the max time only.

       rtapi_delay_max should be called before using rtapi_delay to make sure the required delays
       can be achieved.  The actual resolution of the delay may be as good as one nano-second, or
       as bad as a several microseconds.

REALTIME CONSIDERATIONS

       May be called from init/cleanup code, and from within realtime tasks.

RETURN VALUE

       rtapi_delay_max returns the maximum delay permitted.

SEE ALSO

       rtapi_clock_set_period(3rtapi)