[PATCH] c-user: Document rtems_semaphore_obtain() errors
sebastian.huber at embedded-brains.de
Fri Apr 16 06:59:00 UTC 2021
c-user/semaphore/directives.rst | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/c-user/semaphore/directives.rst b/c-user/semaphore/directives.rst
index 54f40a4..7c2a9c8 100644
@@ -525,9 +525,17 @@ scheduler.
There was no semaphore associated with the identifier specified by ``id``.
+ The semaphore uses a priority ceiling and there was no priority ceiling
+ defined for the :term:`home scheduler` of the calling task.
The semaphore could not be obtained immediately.
+ The semaphore uses a priority ceiling and the calling task had a current
+ priority less than the priority ceiling.
Acquiring of the local, binary semaphore by the calling task would have
cased a deadlock.
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