VMS Help DCE_THREADS, Thread Intro, Thread Priority Concurrency and Scheduling Routines  *Conan The Librarian (sorry for the slow response - running on an old VAX)

   pthread_getconcurrency    Obtains the current concurrency level
                             parameter for the process.

   pthread_getschedparam     Obtains the current scheduling policy and
                             scheduling parameters of a thread.

   pthread_getsequence_np    Obtains a thread sequence number.

   pthread_setconcurrency    Changes the current concurrency level
                             parameter for the process.

   pthread_setschedparam     Changes the current scheduling policy
                             and scheduling parameters of a thread.