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

   pthread_mutexattr_gettype_np
                             Obtains the mutex type attribute of a
                             mutex attributes object.

   pthread_mutexattr_settype_np
                             Changes the mutex type attribute of a
                             mutex attributes object.