VMS Help DCE_THREADS, Thread Intro, Non Portable Extensions, DECthreads Global Mutex Routines  *Conan The Librarian (sorry for the slow response - running on an old VAX)

   pthread_lock_global_np    Locks the DECthreads global mutex if it
                             is unlocked.

   pthread_unlock_global_np  Unlocks the DECthreads lobal mutex if it
                             is locked.