Experimental Physics and
Industrial Control System

> I tried the simply minded (early morning) test of removing the two #undef lines.

Turns out I have a quick answer for this.  Some ~emulated environments don't fully support the PI futex() operations.  (eg. rr-project.org)  In these cases pthread_mutex_init() fails with ENOTSUP.

It seems like the right approach is to probe, as is done in osdThread.c, to see if PI mutex is available.
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[Merge] ~dirk.zimoch/epics-base:epicsMutexPriorityInheritance into epics-base:7.0 Dirk Zimoch via Core-talk

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