For example, in a priority time-slicing system, the processes awaiting execution are organized in several queues with the higher-priority queues having a smaller time quantum. Whenever a processor becomes available for scheduling, the oldest process that is free to run in the highest-priority queue is started.
If this process runs to the end of its quantum without generating an interrupt then it will be rescheduled into a lower-priority queue with a larger quantum. If, before the quantum has expired, the process generates an interrupt then it will be returned either to the same queue or possibly to a higher-priority queue with a shorter quantum. If the process is itself interrupted by some external event that allows the rescheduling of a higher-priority process (with a shorter quantum) then again the interrupted process is returned to the queue from which it originated.
The net effect is that low-priority processes, with long quanta, are likely to be interrupted by the completion of input/output transactions on behalf of higher-priority processes, which will thus be freed for further processing.
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