UGC-NET | UGC NET CS 2018 July – II | Question 51

At a particular time of computation, the value of a counting semaphore is 10. Then 12 P operations and “x” V operations were performed on this semaphore. If the final value of semaphore is 7, x will be:
(A) 8
(B) 9
(C) 10
(D) 11

Answer: (B)
Explanation: Initially, the value of a counting semaphore is 10 Now 12 P operation are performed.
Now counting semaphore value = -2
“x” V operations were performed on this semaphore and final value of counting semaphore = 7
i.e x + (-2) = 7
x = 9.
So, option (C) is correct.
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