> ... Have you really seen ...
Yes Dirk, really really. cf. https://github.com/rr-debugger/rr/issues/2750
If we open the source it's easy enough to see what glibc (at least) is doing.
https://github.com/bminor/glibc/blob/76ea70c613cee23a1846b9605e6433c1fa8baea7/nptl/pthread_mutexattr_setprotocol.c#L25
So pthread_mutexattr_setprotocol() will only fail if passed an unknown flag.
https://github.com/bminor/glibc/blob/76ea70c613cee23a1846b9605e6433c1fa8baea7/nptl/pthread_mutex_init.c#L76-L78
And here is pthread_mutex_init() testing for OS support, and returning ENOTSUP if this isn't found.
If anything, I'm left with some gratitude that glibc does this test in pthread_mutex_init() instead of letting it be discovered during pthread_mutex_lock().
Also, seeing how pthread_mutexattr_t is only a bit mask makes me skeptical of economizing.
--
https://code.launchpad.net/~dirk.zimoch/epics-base/+git/epics-base/+merge/394327
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