At a particular time of computation, the value of a counting

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PGCET CSE Exam (Karnataka) 2011 click here to view all questions

At a particular time of computation, the value of a counting semaphore is 7. Then 20 P operations and 'x' V operations were completed on this semaphore. If the final value of the semaphore is 5, x will be

A13

B15

C18

D22

Nithin K ? Dec 7 '2016 at 22:24

Answer: 18

Explanation:

P means wait ie S:= S-1;
V means signal i.e S= S+1;

Each P operation will decrease the semaphore value by 1 and V operation increases by 1.
So,
7 -> 20p -> Xv = 5
=>7-20+X=5 
=> X = 18.

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Answer: 18 Explanation: P means wait ie S:= S-1; V means signal i.e S= S+1; Each P operation will decrease the semaphore value by 1 and V operation increases by 1. So, 7 -> 20p -> Xv = 5 =>7-20+X=5  => X = 18. Nithin K ? answered Dec 7 '2016 at 22:24 All Comments

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