Q. 69 Which of the following statements about synchronous and asynchronous I/O is
NOT true?
(A) An ISR is invoked on completion of I/O in synchronous I/O but not in
asynchronous I/O
(B) In both synchronous and asynchronous I/O an ISR (Interrupt Serive
Routine) is invoked after completion of the I/O
(C) A process making a synchronous I/O cal waits until I/O is complete, but a
process making an asynchronous I/O call does not wait for completion of
the I/O
(D) In the case of synchronous I/O, the process waiting for the completion of
I/O is woken up by the ISR that is invoked afterr the completion of I/O
Answer: (B)
Explanation:
