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That is, SCHED_RR is SCHED_FIFO with timeslicesit is a real-timeround-robin scheduling algorithm.īoth real-time scheduling policies implement static priorities. SCHED_RR is identical to SCHED_FIFO except that eachprocess can only run until it exhausts a predetermined timeslice. If a SCHED_FIFO task is runnable, all tasks at a lowerpriority cannot run until it finishes. Two or more SCHED_FIFO tasks at the same priority runround robin. When a SCHED_FIFO task becomes runnable, it will continue to rununtil it blocks or explicitly yields the processor it has no timeslice and canrun indefinitely. A runnable SCHED_FIFO task will always be scheduled over any SCHED_OTHERtasks.
SCHED_FIFO implements a simple first-in,first-out scheduling algorithm without timeslices. The normal, not real-time scheduling policy is SCHED_OTHER. Linux provides two real-time scheduling policies, SCHED_FF and SCHED_RR.
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