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10.904 pthread_sigmask

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

Gnulib module: pthread_sigmask

Portability problems fixed by Gnulib:

• This function is missing on some platforms: Minix 3.1.8, mingw, MSVC 14.
• This function is declared in <pthread.h> instead of <signal.h> on some platforms: FreeBSD 6.4, OpenBSD 3.8.
• This function does nothing and always returns 0 in programs that are not linked with -lpthread on some platforms: FreeBSD 14.0, MidnightBSD 1.1, HP-UX 11.31, Solaris 9.
• When it fails, this functions returns -1 instead of the error number on some platforms: Cygwin 1.7.5.

Portability problems not fixed by Gnulib:

• On platforms that do not natively support this function, it has unspecified behavior in a multi-threaded process.
• In case of failure, the return value is wrong on some platforms: NetBSD 9.3 when libpthread is not in use.