Explain about deadlock detection, Operating System

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Explain about deadlock detection?

In deadlock situation, the system must provide

An algorithm that verifies the state of the system to verify whether a deadlock has occurred.
An algorithm to recover from the deadlock.

Single instance of each resource type

If all resources have only a single instance, then we can explain a deadlock detection algorithm that uses a variant of the resource-allocation graph, called a wait-for graph.

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