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10.883 pthread_once

POSIX specification:
https://pubs.opengroup.org/onlinepubs/9699919799/functions/pthread_once.html

Gnulib module: pthread-once

Portability problems fixed by Gnulib:

• This function is missing on some platforms: Minix 3.1.8, mingw, MSVC 14. But the provided replacement is just a dummy on some of these platforms: Minix 3.1.8.
• This function makes applications hang forever on some platforms: Cygwin 3.5.3.

Portability problems not fixed by Gnulib: