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A counting semaphore was initialized to 0, then 20 V operations were successfully completed on this semaphore, followed with 18 P operations, the resulting value of the semaphore is:
- a)18
- b)20
- c)0
- d)2
Correct answer is option 'D'. Can you explain this answer?
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Verified Answer
A counting semaphore was initialized to 0, then 20 V operations were s...
20V => increments the semaphore 20 times. Hence , the value becomes 20. 18P => decrements the semaphore 18 times. Hence , the value becomes 2.
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A counting semaphore was initialized to 0, then 20 V operations were s...
The counting semaphore is a synchronization primitive used for controlling access to a shared resource. It is initialized with a non-negative integer value and supports two operations: P (proberen) and V (verhogen).
Explanation:
- The counting semaphore is initialized to 0, which means that there are no available resources initially.
- 20 V operations are successfully completed on this semaphore. The V operation increments the value of the semaphore by 1, representing the release of a resource. So, after 20 V operations, the value of the semaphore becomes 20.
- 18 P operations are then performed on the semaphore. The P operation decrements the value of the semaphore by 1, representing the acquisition of a resource. However, since the initial value of the semaphore was 0 and there were only 20 resources available, only 18 P operations can be successfully completed. The remaining 2 P operations will be blocked until more resources are released.
- The resulting value of the semaphore is the initial value plus the number of successful V operations minus the number of successful P operations. In this case, the initial value is 0, there were 20 successful V operations, and 18 successful P operations. Therefore, the resulting value is 0 + 20 - 18 = 2.
Conclusion:
- The resulting value of the semaphore after 20 V operations and 18 P operations is 2 (option D).
Explanation:
- The counting semaphore is initialized to 0, which means that there are no available resources initially.
- 20 V operations are successfully completed on this semaphore. The V operation increments the value of the semaphore by 1, representing the release of a resource. So, after 20 V operations, the value of the semaphore becomes 20.
- 18 P operations are then performed on the semaphore. The P operation decrements the value of the semaphore by 1, representing the acquisition of a resource. However, since the initial value of the semaphore was 0 and there were only 20 resources available, only 18 P operations can be successfully completed. The remaining 2 P operations will be blocked until more resources are released.
- The resulting value of the semaphore is the initial value plus the number of successful V operations minus the number of successful P operations. In this case, the initial value is 0, there were 20 successful V operations, and 18 successful P operations. Therefore, the resulting value is 0 + 20 - 18 = 2.
Conclusion:
- The resulting value of the semaphore after 20 V operations and 18 P operations is 2 (option D).
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A counting semaphore was initialized to 0, then 20 V operations were successfully completed on this semaphore, followed with 18 P operations, the resulting value of the semaphore is:a)18b)20c)0d)2Correct answer is option 'D'. Can you explain this answer?
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