/sys$common/syshlp/helplib.hlb POSIX Threads, PTHREAD routines, pthread_cancel, Associated Routines  *Conan The Librarian (sorry for the slow response - running on an old VAX)

       pthread_cleanup_pop()
       pthread_cleanup_push()
       pthread_create()
       pthread_exit()
       pthread_join()
       pthread_setcancelstate()
       pthread_setcanceltype()
       pthread_testcancel()