RTEMS C User's Guide
Timeslicing is a task scheduling discipline in which tasks of equal priority are executed for a specific period of time before control of the CPU is passed to another task. It is also sometimes referred to as the automatic round-robin scheduling algorithm. The length of time allocated to each task is known as the quantum or timeslice.
The system's timeslice is defined as an integral number of ticks, and is specified in the Configuration Table. The timeslice is defined for the entire system of tasks, but timeslicing is enabled and disabled on a per task basis.
The rtems_clock_tick
directive implements timeslicing by
decrementing the running task's time-remaining counter when both
timeslicing and preemption are enabled. If the task's timeslice
has expired, then that task will be preempted if there exists a
ready task of equal priority.
RTEMS C User's Guide
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