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Process scheduling

Fixed priority class

The fixed priority class uses a fixed priority scheduling policy so that critical processes or LWPs can run in predetermined order. Fixed priorities never change except when a user requests a change. Contrast this fixed priority policy with the time-sharing policy in which the system changes priorities to provide good interactive response time.

Privileged users can use the priocntl(1) command or the priocntl(2) system call to assign fixed priorities.

The scheduler manages fixed priority processes or LWPs using configurable parameters in the fixed priority parameter table fp_dptbl. This table contains information specific to the fixed priority class.


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