OS Problem on counting semaphore

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Problem on Counting Semaphore

The questions are being asked on counting semaphore in GATE. Generally the questions are very simple that contains only subtraction and addition.

Wait → Decre → Down → P 
Signal → Inc → Up → V

The following type questions can be asked in GATE.

A Counting Semaphore was initialized to 12. then 10P (wait) and 4V (Signal) operations were computed on this semaphore. What is the result?

S = 12 (initial) 
10 p (wait) :
S = S -10 = 12 - 10 = 2 
then 4 V : 
S = S + 4 =2 + 4 = 6

Hence, the final value of counting semaphore is 6.

Next TopicBinary Semaphore or Mutex

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