rtapi_prio
NAME
rtapi_prio — thread priority functions
SYNTAX
int rtapi_prio_highest()
int rtapi_prio_lowest()
int rtapi_prio_next_higher ( int prio )
int rtapi_prio_next_lower ( int prio)
ARGUMENTS
prio
A value returned by a prior rtapi_prio_xxx call
DESCRIPTION
The rtapi_prio_xxxx functions provide a portable way to set task
priority.
The mapping of actual priority to priority number depends on the
RTOS.
Priorities range from rtapi_prio_lowest to
rtapi_prio_highest, inclusive.
To use this API, use one of two methods:
1)
Set your lowest priority task to rtapi_prio_lowest, and for
each task of the next lowest priority, set their priorities to
rtapi_prio_next_higher(previous).
2)
Set your highest priority task to rtapi_prio_highest, and
for each task of the next highest priority, set their priorities
to rtapi_prio_next_lower(previous).
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Note
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A high priority task will pre-empt or interrupt a lower priority
task. Linux is always the lowest priority! |
REALTIME CONSIDERATIONS
Call these functions only from within init/cleanup code, not from realtime tasks.
RETURN VALUE
Returns an opaque real-time priority number.
SEE ALSO
rtapi_task_new