Fixed Priority Scheduling

The FX, fixed priority, scheduling class assigns fixed priorities and time quantum not adjusted to accommodate resource consumption. Process priority can be changed only by the process that assigned the priority or an appropriately privileged process. For more information about FX, see the priocntl(1) and dispadmin(1M) man pages.

The normal range of fixed priority scheduler class priorities is 0 to 60, which get mapped by the scheduler into dispatch priorities in the same range (0 to 59) as the TS and IA scheduling classes.