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

                   PTHREAD_JOIN32(),  PTHREAD_JOIN64()

       The pthread_join32() and pthread_join64() forms are only
       valid in 64-bit pointer environments for OpenVMS Alpha.
       Ensure that your compiler provides 64-bit support before you
       use pthread_join64().

    Causes the calling thread to wait for the termination of a
    specified thread.

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