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

  • a)
    8

  • b)
    12

  • c)
    18

  • d)
    11

Correct answer is option 'C'. Can you explain this answer?
Most Upvoted Answer
At a particular time of computation, the value of a counting semaphore...
Intially the value of a counting semaphore is 10 Now 12 P operation are performed. Now counting semaphore value = -2 “x” V operations were performed on this semaphore and final value of counting semaphore = 7 i.e x + (-2) = 7 x = 9. So, option (C) is correct.
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At a particular time of computation, the value of a counting semaphore...
Understanding the scenario:
Given that the initial value of the counting semaphore is 10, 12 P operations and "x" V operations are performed on it. After these operations, the final value of the semaphore is 7.

Calculating the total change in value:
- P operation decreases the semaphore value by 1 each time it is executed.
- V operation increases the semaphore value by 1 each time it is executed.
- Therefore, the total change in value due to 12 P operations is -12, and the total change in value due to "x" V operations is +x.

Calculating the final value of the semaphore:
Given that the final value of the semaphore is 7, we can write the equation as:
Initial value - total change in value = final value
10 - 12 + x = 7
x = 7 + 12 - 10
x = 9
Therefore, the number of V operations performed on the semaphore is 9. Thus, the correct answer is option C which is 10.
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At a particular time of computation, the value of a counting semaphore is 7. Then 20 P operation and x V operations were completed on this semaphore. If the final value of the semaphore is 5, x will bea)8b)12c)18d)11Correct answer is option 'C'. Can you explain this answer?
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