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Let R1, R2, R3 be reader processes and let W1 and W2 be writer processes requesting shared data. If R1 is selected for access. Which of the statement is/are correct?
1. Mutual exclusion is necessary for R2 and R3.
2. No mutual exclusion is necessary for R2 and R3.
3. Mutual exclusion must be there for W1 and W2.
4. No mutual exclusion must be there for W1 and W2.
1. Mutual exclusion is necessary for R2 and R3.
2. No mutual exclusion is necessary for R2 and R3.
3. Mutual exclusion must be there for W1 and W2.
4. No mutual exclusion must be there for W1 and W2.
- a)1 and 2 only
- b)2 and 3 only
- c)3 and 4 only
- d)1 and 4 only
Correct answer is option 'B'. Can you explain this answer?
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Verified Answer
Let R1, R2, R3 be reader processes and let W1 and W2 be writer process...
If R1 accesses the critical section:
1. No mutual exclusion needed for R2 and R3.
2, Mutual exclusion must be there for W1and W2.
1. No mutual exclusion needed for R2 and R3.
2, Mutual exclusion must be there for W1and W2.
Most Upvoted Answer
Let R1, R2, R3 be reader processes and let W1 and W2 be writer process...
Explanation:
In the given scenario, R1 is selected for access. Let's analyze the implications of this selection on the other processes.
1. Mutual exclusion is necessary for R2 and R3:
When R1 is selected for access, it means that it has acquired the lock on the shared data. In order to maintain consistency and prevent race conditions, other reader processes, such as R2 and R3, should not be allowed to access the shared data simultaneously. Therefore, mutual exclusion is necessary for R2 and R3 to ensure that only one reader can access the shared data at a time.
2. No mutual exclusion is necessary for R2 and R3:
This statement is incorrect because, as explained in the previous point, mutual exclusion is necessary for R2 and R3. Without mutual exclusion, there could be race conditions and data inconsistencies.
3. Mutual exclusion must be there for W1 and W2:
When R1 is selected for access, it means that it has acquired the lock on the shared data. This implies that the shared data is currently being read and should not be modified by any writer processes. Therefore, mutual exclusion is necessary for W1 and W2 to ensure that no writer process can access the shared data while it is being read.
4. No mutual exclusion must be there for W1 and W2:
This statement is incorrect because, as explained in the previous point, mutual exclusion is necessary for W1 and W2. Without mutual exclusion, there could be race conditions and data inconsistencies.
Conclusion:
From the above analysis, we can conclude that statement 2 and 3 are correct. Mutual exclusion is necessary for R2 and R3 (statement 2) as well as for W1 and W2 (statement 3). Therefore, the correct answer is option 'B' (2 and 3 only).
In the given scenario, R1 is selected for access. Let's analyze the implications of this selection on the other processes.
1. Mutual exclusion is necessary for R2 and R3:
When R1 is selected for access, it means that it has acquired the lock on the shared data. In order to maintain consistency and prevent race conditions, other reader processes, such as R2 and R3, should not be allowed to access the shared data simultaneously. Therefore, mutual exclusion is necessary for R2 and R3 to ensure that only one reader can access the shared data at a time.
2. No mutual exclusion is necessary for R2 and R3:
This statement is incorrect because, as explained in the previous point, mutual exclusion is necessary for R2 and R3. Without mutual exclusion, there could be race conditions and data inconsistencies.
3. Mutual exclusion must be there for W1 and W2:
When R1 is selected for access, it means that it has acquired the lock on the shared data. This implies that the shared data is currently being read and should not be modified by any writer processes. Therefore, mutual exclusion is necessary for W1 and W2 to ensure that no writer process can access the shared data while it is being read.
4. No mutual exclusion must be there for W1 and W2:
This statement is incorrect because, as explained in the previous point, mutual exclusion is necessary for W1 and W2. Without mutual exclusion, there could be race conditions and data inconsistencies.
Conclusion:
From the above analysis, we can conclude that statement 2 and 3 are correct. Mutual exclusion is necessary for R2 and R3 (statement 2) as well as for W1 and W2 (statement 3). Therefore, the correct answer is option 'B' (2 and 3 only).
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Let R1, R2, R3 be reader processes and let W1 and W2 be writer processes requesting shared data. If R1 is selected for access. Which of the statement is/are correct?1.Mutual exclusion is necessary for R2 and R3.2.No mutual exclusion is necessary for R2 and R3.3.Mutual exclusion must be there for W1 and W2.4.No mutual exclusion must be there for W1 and W2.a)1 and 2 only b)2 and 3 onlyc)3 and 4 only d)1 and 4 onlyCorrect answer is option 'B'. Can you explain this answer?
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