A Solutions Manual for Operating Systems A Concept-Based by Dhananjay M. Dhamdhere

By Dhananjay M. Dhamdhere

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This is to be changed such that a reader starts reading only when no writer is either writing or waiting. Hence the first if statement should be changed to use the condition totwrite = 0. (2) After finishing a write operation, the writer should check whether a writer is waiting to write. If so, it must activate the writer. Else it must activate waiting readers, if any. For this purpose, the while and the second if statements should be interchanged—in fact, the while should be put in Process Synchronization 41 the else clause of the if.

Problem 21: Consider the RRAG of the system. (a) Process P j must satisfy one of the two conditions: (i) it exists in the auxiliary set (AS), or (ii) some process Pk included in the knot set has at least two out-edges (by the definition of a knot, these out-edges are also involved in cycles), and all cycles in which Pk is involved are not broken when Pj is aborted. (b) Process Pi must be in the knot set (KS) and none of the processes in the knot set has more than one out-edge. Problem 22: In an SISR system, no process or resource node has more than one outedge.

This feature permits only one produce or consume action to be in progress. When many producers and consumers exist, this feature can be changed through the following provisions: A producer first produces a record in a temporary area 40 Solutions Manual: Operating Systems (second edition) by Dhamdhere and then enters the while loop to find an empty buffer. When it finds one, it puts the produced record into the buffer. Analogous provisions are made in a consumer. This way produce and consume actions take place outside a CS, which permits many producers and consumers to produce and consume simultaneously.

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