Which of the following statement regarding interrupt is incorrect? (A) If no int

Question

Which of the following statement regarding interrupt is incorrect?

(A) If no interrupts are pending, the processor proceeds to the next fetch stage.

(B) Interrupt usually involves some overhead.

(C) In handling multiple interrupts, the processor cannot disable other interrupts while an interrupt is being processed.

(D) When the processor transfers control to the interrupt service routine, it needs to save the Program Status Word and the location of next instruction to be executed.

(E) None of the above.

Explanation / Answer

When interrupt is being handled, other interrupts are often disabled by the kernel so as to prevent the following:

Thus, (C) is incorrect. Some kernels do disable other interrupts when one is being processed.

Answer is C.

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