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| author | Joel Sherrill <joel.sherrill@OARcorp.com> | 1997-04-15 18:02:18 +0000 |
|---|---|---|
| committer | Joel Sherrill <joel.sherrill@OARcorp.com> | 1997-04-15 18:02:18 +0000 |
| commit | 6881e0cb4be86a4e91cd2f4d95c43b20d7b89de4 (patch) | |
| tree | d13120221489f408287925a9afdebdb2f722b33b /cpukit/posix/include/rtems | |
| parent | Added directories to place test output screens into as part of fixing (diff) | |
| download | rtems-6881e0cb4be86a4e91cd2f4d95c43b20d7b89de4.tar.bz2 | |
Reduced number of POSIX thread priorities from 255 to 254 to avoid conflicts
of lowest priority with the RTEMS IDLE thread. This was causing the lowest
priority GNAT Ada task to never run.
Diffstat (limited to 'cpukit/posix/include/rtems')
| -rw-r--r-- | cpukit/posix/include/rtems/posix/priority.h | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/cpukit/posix/include/rtems/posix/priority.h b/cpukit/posix/include/rtems/posix/priority.h index ce925b6d58..c0253f3bab 100644 --- a/cpukit/posix/include/rtems/posix/priority.h +++ b/cpukit/posix/include/rtems/posix/priority.h @@ -15,9 +15,15 @@ * "Numericallly higher values represent higher priorities." * * Thus, RTEMS Core has priorities run in the opposite sense of the POSIX API. + * + * There are only 254 posix priority levels since a task at priority level + * 255 would never run because of the RTEMS idle task. This is necessary + * because GNAT maps the lowest Ada task priority to the lowest thread + * priority. The lowest priority Ada task should get to run, so there is + * a fundamental conflict with having 255 priorities. */ -#define POSIX_SCHEDULER_MAXIMUM_PRIORITY (255) +#define POSIX_SCHEDULER_MAXIMUM_PRIORITY (254) #define POSIX_SCHEDULER_MINIMUM_PRIORITY (1) |