Explain wait for graph-resource request and allocation graph, Computer Engineering

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Explain Wait for graph (WFG) with Resource request and allocation graph (RRAG).

WFG with RRAG:

A graph G = (V,E) is termed as bipartite if V can be decomposed in two disjoint sets V1 and V2 therefore every edge in E joins a vertex in V1 to a vertex in V2. Assume that V1 be a set of processes and also V2 be a set of resources. Thus the graph is directed we will seems as:

2420_Resource request and allocation graph.png

 

 

  • An edge (Rj,Pi) that is an assignment edge to mean that resource Rj has been assigned to process Pi
  • An edge (Pi,Rj) (termed as a request edge) to implies that process Pi has requested resource Rj

1. Utilize a resource allocation graph to derive a wait-for-graph.

2. Wait-for graph acquired by making an edge from p1 to p2 if p1 is waiting for a resource which is allocated to p2.

3. Deadlock exists if a cycle exists into resulting wait-for-graph.

245_WF Graph.png


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