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ISRO | ISRO CS 2017 – May | Question 78

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At particular time, the value of a counting semaphore is 10, it will become 7 after: (a) 3 V operations (b) 3 P operations (c) 5 V operations and 2 P operations (d) 2 V operations and 5 P operations Which of the following option is correct? (A) Only (b) (B) Only(d) (C) Both (b) and (d) (D) None of these

Answer: (C)

Explanation: P: Wait operation decrements the value of the counting semaphore by 1. V: Signal operation increments the value of counting semaphore by 1. Current value of the counting semaphore = 10 a) after 3 P operations, value of semaphore = 10-3 = 7 d) after 2 v operations, and 5 operations value of semaphore = 10 + 2 – 5 = 7 Hence option (C) is correct.

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Last Updated : 21 Mar, 2018
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