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Consider a system employing a deadlock-avoidance scheme based on pre-declaration of resource needs for various processes. In particular, the resource needs of the processes are represented by claim arcs in the resource-allocation graph. Whenever a resource request by a process is issued, it is rejected by the system if the newly formed allocation arc (from the resource vertex to the process vertex) replacing the corresponding claim arc (from the process vertex to the resource vertex) closes a cycle in the resource-allocation graph. Otherwise, the system grants the request and converts the claim arc to the allocation arc in the resource-allocation graph. Let P1, P2 and P3 be three processes in the system. Let P1 declare that it may request resources W, X and Y; P2 declare that it may request resources X, Y and Z; P3 declare that it may request resources W, Y and Z. Construct the resource-allocation graph with the appropriate claim arcs. Consider each of the following pairs of resource requests. Based on the resource-allocation graph constructed above, identify the pair of requests among the following that can be granted without a deadlock possibility? A. P1 requesting Y and P3 requesting W B. P1 requesting W and P3 requesting Y C. P1 requesting X and P2 requesting Z D. P1 requesting X and P2 requesting Y

Consider a system employing a deadlock-avoidance scheme based on pre-declaration of resource needs for various processes. In particular, the resource needs of the processes are represented by claim arcs in the resource-allocation graph. Whenever a resource request by a process is issued, it is rejected by the system if the newly formed allocation arc (from the resource vertex to the process vertex) replacing the corresponding claim arc (from the process vertex to the resource vertex) closes a cycle in the resource-allocation graph. Otherwise, the system grants the request and converts the claim arc to the allocation arc in the resource-allocation graph. Let P1, P2 and P3 be three processes in the system. Let P1 declare that it may request resources W, X and Y; P2 declare that it may request resources X, Y and Z; P3 declare that it may request resources W, Y and Z. Construct the resource-allocation graph with the appropriate claim arcs. Consider each of the following pairs of resource requests. Based on the resource-allocation graph constructed above, identify the pair of requests among the following that can be granted without a deadlock possibility? A. P1 requesting Y and P3 requesting W B. P1 requesting W and P3 requesting Y C. P1 requesting X and P2 requesting Z D. P1 requesting X and P2 requesting Y

Operations Research : Applications and Algorithms
Operations Research : Applications and Algorithms
4th Edition
ISBN:9780534380588
Author:Wayne L. Winston
Publisher:Wayne L. Winston
Chapter18: Deterministic Dynamic Programming
Section18.4: Resource-allocation Problems
Problem 3P
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Consider a system employing a deadlock-avoidance scheme based on pre-declaration of resource needs for various processes. In particular, the resource needs of the processes are represented by claim arcs in the resource-allocation graph. Whenever a resource request by a process is issued, it is rejected by the system if the newly formed allocation arc (from the resource vertex to the process vertex) replacing the corresponding claim arc (from the process vertex to the resource vertex) closes a cycle in the resource-allocation graph. Otherwise, the system grants the request and converts the claim arc to the allocation arc in the resource-allocation graph. Let P1, P2 and P3 be three processes in the system. Let P1 declare that it may request resources W, X and Y; P2 declare that it may request resources X, Y and Z; P3 declare that it may request resources W, Y and Z. Construct the resource-allocation graph with the appropriate claim arcs. Consider each of the following pairs of resource requests. Based on the resource-allocation graph constructed above, identify the pair of requests among the following that can be granted without a deadlock possibility? A. P1 requesting Y and P3 requesting W B. P1 requesting W and P3 requesting Y C. P1 requesting X and P2 requesting Z D. P1 requesting X and P2 requesting Y
Transcribed Image Text:Consider a system employing a deadlock-avoidance scheme based on pre-declaration of resource needs for various processes. In particular, the resource needs of the processes are represented by claim arcs in the resource-allocation graph. Whenever a resource request by a process is issued, it is rejected by the system if the newly formed allocation arc (from the resource vertex to the process vertex) replacing the corresponding claim arc (from the process vertex to the resource vertex) closes a cycle in the resource-allocation graph. Otherwise, the system grants the request and converts the claim arc to the allocation arc in the resource-allocation graph. Let P1, P2 and P3 be three processes in the system. Let P1 declare that it may request resources W, X and Y; P2 declare that it may request resources X, Y and Z; P3 declare that it may request resources W, Y and Z. Construct the resource-allocation graph with the appropriate claim arcs. Consider each of the following pairs of resource requests. Based on the resource-allocation graph constructed above, identify the pair of requests among the following that can be granted without a deadlock possibility? A. P1 requesting Y and P3 requesting W B. P1 requesting W and P3 requesting Y C. P1 requesting X and P2 requesting Z D. P1 requesting X and P2 requesting Y
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