pthread_sigmask (GNU Gnulib)

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.