Sure, run time failure needs to be considered. Falling back from PTHREAD_PRIO_INHERIT to PTHREAD_PRIO_NONE is relatively safe.
What we really need is recursive mutexes. Removing the pre 1995 compatible code (older than VxWorks 5.5, yay) would simplify the implementation a lot. As long as we document the drop of support, I think we are fine.
--
https://code.launchpad.net/~dirk.zimoch/epics-base/+git/epics-base/+merge/394327
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