pthread_sigmask
===============

POSIX specification:
 http://www.opengroup.org/onlinepubs/9699919799/functions/pthread_sigmask.html

Gnulib module: pthread_sigmask

Portability problems fixed by Gnulib:

  * This function is missing on some platforms: Solaris 2.4, mingw, BeOS.

  * This function is declared in <pthread.h> instead of <signal.h> on some platforms: MacOS X 10.3, FreeBSD 6.4, OpenBSD 3.8, OSF/1 4.0.

Portability problems not fixed by Gnulib:

  * On platforms that do not natively support this function, it has unspecified behavior in a multi-threaded process.