RTEMS C User's Guide
A sleep timer allows a task to delay for a given
interval or up until a given time, and then wake and continue
execution. This type of timer is created automatically by the
rtems_task_wake_after
and rtems_task_wake_when directives and, as a result,
does not have an RTEMS ID. Once activated, a sleep timer cannot
be explicitly deleted. Each task may activate one and only one
sleep timer at a time.
RTEMS C User's Guide
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