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

 thread

    Location for thread object to be created.

 attr

    Thread attributes object that defines the characteristics of the
    thread being created. If you specify NULL, default attributes are
    used.

 start_routine

    Function executed as the new thread's start routine.

 arg

    Address value copied and passed to the thread's start routine.