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Previous Year Question (PYQs)

Complete the following statement by choosing the correct option. 
For a deadlock to occur, the four conditions namely Mutual Exclusion, Hold and wait, No preemption, circular wait _________




Solution

For a deadlock to occur in a system, the following Coffman’s conditions must all hold together:

  1. Mutual Exclusion – At least one resource must be held in a non-shareable mode.

  2. Hold and Wait – A process holding resources is waiting for additional resources.

  3. No Preemption – Resources cannot be forcibly taken away; they are released only voluntarily.

  4. Circular Wait – A closed chain of processes exists, each waiting for a resource held by the next process in the chain.

If even one of these is not satisfied, deadlock cannot occur.


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