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

 thread

    Thread whose scheduling policy and parameters are to be changed.

 policy

    New scheduling policy value for the thread specified in thread.
    The following are valid values:

       SCHED_BG_NP
       SCHED_FG_NP
       SCHED_FIFO
       SCHED_OTHER
       SCHED_RR

 param

    New values of the scheduling parameters associated with the
    scheduling policy for the thread specified in thread. Valid
    values for the sched_priority field of a sched_param structure
    depend on the chosen scheduling policy. Use the POSIX routines
    sched_get_priority_min() or sched_get_priority_max()  to
    determine the low and high limits of each policy.

    Additionally, the Threads Librray provides nonportable priority
    range constants, as follows:

    Low              High

    PRI_FIFO_MIN     PRI_FIFO_MAX
    PRI_RR_MIN       PRI_RR_MAX
    PRI_OTHER_MIN    PRI_OTHER_MAX
    PRI_FG_MIN_NP    PRI_FG_MAX_NP
    PRI_BG_MIN_NP    PRI_BG_MAX_NP

    The default priority varies by platform. On Tru64 UNIX, the
    default is 19 (that is, the POSIX priority of a normal timeshare
    process). On other platforms the default priority is the midpoint
    between PRI_FG_MIN_NP and PRI_FG_MAX_NP.