GATE | GATE-CS-2001 | Question 45

Which of the following does not interrupt a running process?
(A) A device
(B) Timer
(C) Scheduler process
(D) Power failure

Answer: (C)

Explanation: Scheduler process doesn’t interrupt any process, it’s Job is to select the processes for following three purposes.
Long-term scheduler(or job scheduler) –selects which processes should be brought into the ready queue
Short-term scheduler(or CPU scheduler) –selects which process should be executed next and allocates CPU.
Mid-term Scheduler (Swapper)- present in all systems with virtual memory, temporarily removes processes from main memory and places them on secondary memory (such as a disk drive) or vice versa. The mid-term scheduler may decide to swap out a process which has not been active for some time, or a process which has a low priority, or a process which is page faulting frequently, or a process which is taking up a large amount of memory in order to free up main memory for other processes, swapping the process back in later when more memory is available, or when the process has been unblocked and is no longer waiting for a resource.


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