Hi -
there are some libraries which want to be threadsafe while
not deploying threads by theirselfes. That's what we have
the stubs in libc for.

pthread_equal() is missing here. It certainly makes sense
to use it in libraries to ensure thread safety -- just stumbled
over it in HDF5 which has its own recursive mutex implementation.
(And there are more, eg libxml2. Also see PR lib/29952.)

It would be straightforward to add it to libc/thread-stub.
But in this simple case: would it be wrong to simply make
it a macro?

best regards
Matthias




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