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

 attr

    Thread attributes object for the scheduling policy attribute
    whose parameters are to be set.

 param

    A structure containing new values for scheduling parameters
    associated with the scheduling policy attribute of the specified
    thread attributes object.

                                   NOTE

       The Threads Library provides only the sched_priority
       scheduling parameter. See below for information about this
       scheduling parameter.