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In non-preemptive scheduling, the running process cant be interrupted .But what will when the CPU receive a hardware interrupt such as the an interrupt from the printer indicating that the current job has been completed ? Does the CPU will preempt the current running process and handles the interrupt ( run its interrupt service routine ) or this interrupt will be stored and then handled when the current running process leaves the CPU ?

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In a non-preemptive scheduler, the running process cannot be interrupted by another process. The running process can be interrupted by hardware interrupts.

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