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Priority Scheduling

  •  Each process has its own priority.
  • Out of all available processes highest priority process gets the CPU.
  • If Tie then use FCFS.
  • Priority 
                             1. Static (doesn't change throughout the execution of process).

                            2. Dynamic (Changes after some interval of time).

  • Version 
                                  1. Non- preemptive

                                  2. Preemptive

Starvation and Aging (In Priority Scheduling)

Starvation

Indefinite Blocking
  • A Process which is ready to run can wait indefinitely because of low priority.
  • High priority processes prevent a low priority proccess from ever getting the CPU.

Aging

  • Method to ensure that process with lower priority will eventually complete thier execution.
  • By gradually increasing the priority of processes that wait in the System for a long time.

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