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who initiates priority in scheduling in RTOS?

+3 votes

How priority is initialized in RTOS? who will initiate priority for scheduling?

posted Sep 21, 2013 by Giri Prasad

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1 Answer

+1 vote

Most RTOS have between 32 and 256 possible priorities for individual tasks/processes. The scheduler will run the task with the highest priority. When a running task gives up the CPU, the next highest priority task runs, and so on...

The highest priority task in the system will have the CPU until:

  • it runs to completion (i.e. it voluntarily give up the CPU)
  • a higher priority task is made ready, in which case the original task is pre-empted by the new (higher priority) task.
    As a developer, it is your job to assign the task priorities such that your deadlines will be met.
answer Sep 21, 2013 by Salil Agrawal
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