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RESOURCE ALLOCATION GRAPH
When a process Pi wishes an instance of resource type Rj, a request edge is inserted in the resource allocation graph. When this request is able to be fulfilled, the request edge is immediately transformed to an assignment edge. When the process no longer requires access to the resource, it liberate the resource as a result the assignment edge is deleted.
Process states:
If there is a cycle in the reallocation graph then there is deadlock, else no.
Define deadlock. A process requests resources; if the resources are not available at that time, the process enters a wait state. Waiting processes might be never again change s
what are the threds in operating system?
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Differentiate tightly coupled systems and loosely coupled systems? Loosely coupled systems:- Every processor has its own local memory Every processor can communicate
Several schemes available are as follows: Pipes : One-way communication process through which different process can interact. The problem is that the two processes could have
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