VMS Help POSIX Threads, PTHREAD routines, pthread_mutex_init, Associated Routines  *Conan The Librarian (sorry for the slow response - running on an old VAX)

       pthread_mutexattr_init()
       pthread_mutexattr_gettype()
       pthread_mutexattr_settype()
       pthread_mutex_lock()
       pthread_mutex_trylock()
       pthread_mutex_unlock()