What is a resource-allocation graph, Operating System

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What is a resource-allocation graph?

Deadlocks can be explained more precisely in terms of a directed graph called a system resource allocation graph. This graph having of a set of vertices V and a set of edges E. The set of vertices V is partitioned into two dissimilar types of nodes; P the set having of all active processes in the system and R the set consisting of all resource types in the system.

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