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The libc on my system, Ubuntu 14.04, exports __register_atfork, which is documented here:

> http://refspecs.linuxbase.org/LSB_3.1.0/LSB-Core-generic/LSB...

pthread_atfork itself really should be moved into libc, however. (And POSIX should stop treating it as a redheaded stepchild: it's useful!)

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A threading interface was standardized into C 2011, so pthreads should eventually stop being necessary. In a sense, not just POSIX, but C proper has adopted a threading interface.

The C threads interface is missing important functionality --- priority inheritance and static mutex initializers come to mind. C11 threads.h is a lowest-common-denominator portability shim, not a general-purpose pthreads replacement.

threads.h are the lowest common denominator. If you want system specific functionality you can always wrap those functions.

Static mutex init can be emulated with call_once() function, with some limitations of its own of course.

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