NTA | UGC NET 2019 December | Question 7

A counting semaphore is initialized to 8. 3 wait() operations and 4 signal() operations are applied. Find the current value of semaphore variable.

(A)

9

(B)

5

(C)

1

(D)

4

Answer: (A)
Explanation:

In counting semaphore,Wait operations will decrease the value and signal operations will increase the value.
Initially counting semaphore value is 8.

= 8 – 3 + 4
= 5 + 4
= 9

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