schedgetprioritymax(2)                            schedgetprioritymax(2)



NAME
     schedgetprioritymax, schedgetprioritymin - get scheduling policy
     priority range

C SYNOPSIS
     #include <sched.h>

     int schedgetprioritymax (int policy);

     int schedgetprioritymin (int policy);


DESCRIPTION

     schedgetprioritymax and schedgetprioritymin return the maximum and

     minimum priority values, respectively, for the specified scheduling

     policy:


     SCHEDFIFO

             The first-in-first-out real-time policy


     SCHEDRR

             The round-robin real-time scheduling policy


     SCHEDTS

             The timeshare earnings based scheduling policy


     SCHEDOTHER

             The scheduling policy is equivalent to the SCHED_TS


     Unlike IRIX 6.2 and earlier releases, processes having a higher numerical

     priority value are more important than processes having a lower numerical

     priority value.


     Arbitrary priority values within the range should not be used.

     Developers must consider the needs of the application and how it should

     interact with the rest of the system, before selecting a real-time

     priority.  To aid in this decision, the priorities of the system threads

     should be considered. See the "Real-Time Priority Band" section of

     realtime(5) for more detailed information.


     schedgetprioritymax and schedgetprioritymin will fail if the

     following is true:


     [EINVAL]       The policy argument does not represent a valid scheduling

                    policy.


SEE ALSO

     realtime(5), sched_setparam(2), sched_getparam(2), sched_setscheduler(2),

     sched_yield(2), sched_rr_get_interval(2)


DIAGNOSTICS

     Upon successful completion, the scheduling priority maximum or minimum

     for policy is returned to the calling process.  Otherwise, a value of -1

     is returned and errno is set to indicate the error.




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