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At a particular time of computation the value of a counting semaphore is 7. Then 20 P operations and 15 V operation were completed on this semaphore. The resulting value of the semaphore is
  • a)
    42
  • b)
    2
  • c)
    7
  • d)
    12
Correct answer is option 'B'. Can you explain this answer?
Most Upvoted Answer
At a particular time of computation the value of a counting semaphore ...
Concepts:
V(S): Signal operation will increment the semaphore variable, that is, S++.
P(S): Wait operation will decrement the semaphore variable., that is, S--.
Data:
Initial counting semaphore = I = 7
Wait operation = 20 P
Signal operation = 15 V
Final counting semaphore = F
Formula:
F = I + 15V + 20P
Calculation:
F = 7 + 15(+1) + 20(-1)
∴ F = 2
the resulting value of the semaphore is 2
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Community Answer
At a particular time of computation the value of a counting semaphore ...
Concepts:
V(S): Signal operation will increment the semaphore variable, that is, S++.
P(S): Wait operation will decrement the semaphore variable., that is, S--.
Data:
Initial counting semaphore = I = 7
Wait operation = 20 P
Signal operation = 15 V
Final counting semaphore = F
Formula:
F = I + 15V + 20P
Calculation:
F = 7 + 15(+1) + 20(-1)
∴ F = 2
the resulting value of the semaphore is 2
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At a particular time of computation the value of a counting semaphore is 7. Then 20 P operations and 15 V operation were completed on this semaphore. The resulting value of the semaphore isa)42b)2c)7d)12Correct answer is option 'B'. Can you explain this answer?
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