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Which of the following is not a necessary condition for deadlock?
- a)Mutual exclusion
- b)Reentrancy
- c)Hold and wait
- d)No pre-emption
Correct answer is option 'B'. Can you explain this answer?
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Verified Answer
Which of the following is not a necessary condition for deadlock?a)Mut...
There are 4 necessary conditions for Deadlock to occur:
1) Mutual Exclusion
2) No pre-emption
3) Hold and Wait
4) Circular wait
Option (B) is correct.
Most Upvoted Answer
Which of the following is not a necessary condition for deadlock?a)Mut...
Deadlock Conditions in Operating System
Mutual Exclusion
- It is a condition where a resource can be accessed by only one process at a time.
- This condition is necessary for deadlock as if a resource is not exclusive, two or more processes can access it simultaneously, and deadlock cannot occur.
Hold and Wait
- It is a condition where a process holds a resource and waits for another resource to be released.
- This condition is necessary for deadlock as if a process holds a resource and waits for another resource to be released, a circular wait can occur, leading to deadlock.
No Pre-emption
- It is a condition where a resource cannot be forcibly taken away from a process holding it.
- This condition is necessary for deadlock as if a resource can be taken away from a process that is holding it, deadlock can be avoided.
No Reentrancy
- It is a condition where a process cannot reuse a resource while it is still holding it.
- This condition is not necessary for deadlock as reentrancy does not lead to circular wait, and hence deadlock cannot occur.
Conclusion
- Hence, option B, i.e., Reentrancy, is not a necessary condition for deadlock.
Mutual Exclusion
- It is a condition where a resource can be accessed by only one process at a time.
- This condition is necessary for deadlock as if a resource is not exclusive, two or more processes can access it simultaneously, and deadlock cannot occur.
Hold and Wait
- It is a condition where a process holds a resource and waits for another resource to be released.
- This condition is necessary for deadlock as if a process holds a resource and waits for another resource to be released, a circular wait can occur, leading to deadlock.
No Pre-emption
- It is a condition where a resource cannot be forcibly taken away from a process holding it.
- This condition is necessary for deadlock as if a resource can be taken away from a process that is holding it, deadlock can be avoided.
No Reentrancy
- It is a condition where a process cannot reuse a resource while it is still holding it.
- This condition is not necessary for deadlock as reentrancy does not lead to circular wait, and hence deadlock cannot occur.
Conclusion
- Hence, option B, i.e., Reentrancy, is not a necessary condition for deadlock.
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Which of the following is not a necessary condition for deadlock?a)Mutual exclusionb)Reentrancyc)Hold and waitd)No pre-emptionCorrect answer is option 'B'. Can you explain this answer?
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