At a particular time of computation, the value of a counting semaphore is 7. Then 20 P operations and 'x' V operations were performed on this semaphore. If the final value of the semaphore is 5, what is x?
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Correct answer: C. 18
Explanation
As in Q17, the final semaphore value equals initial value minus P operations plus V operations: 7 − 20 + x = 5, so x = 18, option (iii). The arithmetic is identical to Q17; only one of the three wrong distractor values (14 here vs 13 in Q17) differs between the two listings.More Computer System Architecture questions
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