rtapi_prio − thread priority functions
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int rtapi_prio_highest() |
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int rtapi_prio_lowest() |
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int rtapi_prio_next_higher(int prio) |
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int rtapi_prio_next_lower(int prio) |
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prio |
A value returned by a prior rtapi_prio_xxx call |
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:
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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). | ||
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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). |
N.B. A high priority task will pre-empt or interrupt a lower priority task. Linux is always the lowest priority!
Call these functions only from within init/cleanup code, not from realtime tasks.
Returns an opaque real-time priority number.
rtapi_task_new(3rtapi)