UGC-NET | NTA UGC NET 2019 June – II | Question 25

At a particular time of computation, the value of a counting semaphore is 7. Then 20 P(wait) operations and 15 V(signal) operations are completed on this semaphore. What is the resulting value of the semaphore?
(A) 28
(B) 12
(C) 2
(D) 42

Answer: (C)
Explanation: Value of a counting semaphore = 7
After 20 P operations value of semaphore = 7 – 20 = -13
After 15 V operations value of semaphore = -13 + 15 = 2
So, option C is correct.
Quiz of this Question
Please comment below if you find anything wrong in the above post