forked from Imagelibrary/rtems
6881e0cb4b
of lowest priority with the RTEMS IDLE thread. This was causing the lowest priority GNAT Ada task to never run.
45 lines
1.0 KiB
C
45 lines
1.0 KiB
C
/*
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*
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*
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* $Id$
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*/
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#ifndef __RTEMS_POSIX_PRIORITY_h
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#define __RTEMS_POSIX_PRIORITY_h
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#include <rtems/score/priority.h>
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/*
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* 1003.1b-1993,2.2.2.80 definition of priority, p. 19
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*
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* "Numericallly higher values represent higher priorities."
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*
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* Thus, RTEMS Core has priorities run in the opposite sense of the POSIX API.
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*
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* There are only 254 posix priority levels since a task at priority level
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* 255 would never run because of the RTEMS idle task. This is necessary
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* because GNAT maps the lowest Ada task priority to the lowest thread
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* priority. The lowest priority Ada task should get to run, so there is
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* a fundamental conflict with having 255 priorities.
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*/
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#define POSIX_SCHEDULER_MAXIMUM_PRIORITY (254)
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#define POSIX_SCHEDULER_MINIMUM_PRIORITY (1)
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RTEMS_INLINE_ROUTINE boolean _POSIX_Priority_Is_valid(
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int priority
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);
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RTEMS_INLINE_ROUTINE Priority_Control _POSIX_Priority_To_core(
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int priority
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);
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RTEMS_INLINE_ROUTINE int _POSIX_Priority_From_core(
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Priority_Control priority
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);
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#include <rtems/posix/priority.inl>
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#endif
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