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PreviousConsider the following process: | Process | Arrival Time | Burst Time | | :--- | :--- | :--- | | P1 | 0.0 | 7 | | P2 | 2.0 | 4 | | P3 | 4.0 | 1 | | P4 | 5.0 | 4 | Considering non-preemptive and preemptive SJF algorithm, find out average waiting time and average turnaround time in both cases.NextDefine semaphore. Give a scheme for implementation of semaphore primitives.