Deadlock occurrence
Clarify condition for deadlock occurrence?
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Deadlock can take place if four conditions hold simultaneously.
Mutual exclusion:
At a time only one process can use a resource.
Hold and wait:
A process holding at least one resource is waiting to get additional resources held by other processes.
No preemption:
A resource can be released only after that process has completed its task.
Circular wait:
There exists a set {P0, P1, ?, P0} of waiting processes in such manner that P0 is waiting for a resource which is held by P1, P1 is waiting for a resource which is held by P 2, Pn1 is waiting for a resource which is held by Pn, and P0 is waiting for a resource that is held by P0.
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