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What is CPU Scheduler?

->Selects from among the processes in memory that are ready to execute, and allocates the CPU to one of them.

->CPU scheduling decisions may take place when a process:

1.Switches from running to waiting state.

2.Switches from running to ready state.

3.Switches from waiting to ready.

4.Terminates.

->Scheduling under 1 and 4 is nonpreemptive.

->All other scheduling is preemptive.