1. Considering a syslem with five processes P0 through P4 and three resources lypes A, B, C. Resource type A has 7 instances, B has 10 instances and type C has 5 instances. Suppose at time to following snapshot of the system has been taken: Proccss Allocation Маx Available A В C A В A B PO 3 7 3 3 P1 2 2 3 2 P2 2 3 P3 1 1 2 2 2 P4 2 3 4 3 i) ii) What will be the content of need matrix? Is the system in safe state? If yes, then what is the safe sequence? in

1. Considering a syslem with five processes P0 through P4 and three resources lypes A, B, C. Resource type A has 7 instances, B has 10 instances and type C has 5 instances. Suppose at time to following snapshot of the system has been taken: Proccss Allocation Маx Available A В C A В A B PO 3 7 3 3 P1 2 2 3 2 P2 2 3 P3 1 1 2 2 2 P4 2 3 4 3 i) ii) What will be the content of need matrix? Is the system in safe state? If yes, then what is the safe sequence? in

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Suppose a system has 5 processes, P = {P1, P2, P3, P4, P5}, and 4 resources, R = {R1, R2, R3, R4}, where there are 2 instances of R1, 1 instance of R2, 3 instances of R3, and 3 instances of R4. The current state of the system is defined by the following requests and assignments: P1 is requesting an instance of R3 and has been assigned an instance of R2; P2 is requesting an instance of R1 and has been assigned an instance of R3; P3 is requesting an instance of R4 and has been assigned an instance of R1 and an instance of R3; P4 is requesting an instance of R3; P5 is requesting an instance of R2 and has been assigned an instance of R4. Is there deadlock in this system? (Explicitly state yes, there’s deadlock or no, there isn’t.) If applicable, draw a wait-for graph or resource-allocation graph, and use the appropriate graph to justify your answer. If you conclude there is no deadlock, your justification should contain a sequence of execution for the processes which shows that…
Consider a system with five processes and three resource type. Resource type X has 7 instances, resource type Y has 10 instances and resource type Z has 5 instances. Suppose that at time 0, the following snapshot of the system has been taken. Is the process safe? If yes, what is the safe sequence? If not, which process is unsafe?
Consider a computer system which has four identical units of a resource R. There are three processes each with a maximum claim of two units of resource R. Processes can request these resources in any way that is, two in one shot or one by one. The system always satisfies a request for a resource if enough resources are available. If the processes don't request any other kind of resource, show that the system never deadlocks?
Consider a system with three processes (P1, P2, and P3) and four resources (R1 has one instance, R2 has two instances, R3 has one instance, and R4 has three instances). The Snapshot at time Tx has the following situation: P1 holds one instance from Resource R2 and Request Resource R1 P2 holds Resource R1, one instance from Resource R2 and Request Resource R3 P3 holds Resource R3 and Request one instance from Resource R2 Draw the Resource Allocation Graph, then check if the system in safe state or not? If yes? What is the safe sequence?
Hey, I have already received a good answer to this question but I am looking for greater detail to be provided. There are three processes P1, P2 and P3 are running in a system with 3 instances of a resource R1, 2 instances of a resource R2, and 2 instances of a resource R3. At a given time the allocation matrix is: A = [{1, 1, 1} { 0, 1, 0} { 1, 0, 0 }] Assume that the maximum matrix is M = [ {2,2,1} {1,1,1} {3,1,0}] While in this state, a new process P4 is created which requires at most 2 instances of R1 and one instance of R2. This process initially requests one instance of R1 to be allocated to it. Using the Banker’s algorithm, determine whether this request can be granted or must be refused.
b.Start from the resource allocation state in Q 13. If a request from a process P3 arrives for (1, 2, 3), can the request be immediately granted ? Why or why not ? c.Start from the resource allocation state in Q 13. Suppose that P4 asks for 2 instances of resource B. Can the system grant this if it wants to avoid deadlock ? Explain.
22. A system has two processes and three identical resources. Each process needs a maximum of two resources. Is deadlock possible? Explain your answer 23. Consider the previous problem again, but now with p processes each needing a maximum of m resources and a total of r resources available. What condition must hold to make the system deadlock free? please answer the second question...
Suppose at time T0, following is the snapshot of a system with 6 process (P0, P1, P2, P3, P4, P5) and 3 resources (A, B, C) having 8, 10 and 12 instances respectively.Allocation Max A B C A B CP0 2 3 1 4 4 4P1 1 0 3 3 3 3P2 0 2 2 1 2 3P3 1 2 1 2 2 2P4 0 2 1 0 3 5P5 2 0 2 2 1 2Now, if process P4 make a new request (0, 1, 2) for resources then state that whether this request can be granted or not using Banker’s Algorithm.
assume a system has 6 identical resources and N processes competing for them. each process can request at most 2 resources. what is the maximum value of N for the system to be deadlock free?
A system has three processes (P1,P2, P3) and three resources (R1,R2, R3). There is one instance of R1 and R2. There are three instances of R3. P1 holds an R1 and is requesting an R3. P2 holds an R3 and is requesting an R1. P3 holds two instances of R3 and an R2. Does a deadlock exist? Justify your answer.
Suppose processes P1-P4 with the given priorities and resource allocations. 1 is the highest priority and 4 is the lowest priority. Let us also assume that the "no preemption" condition is now relaxed by allowing preemption of resources by processes of higher priority. For example, P3 may preempt P2 or P4 if it needs a resource which they are holding. If P3 preempts one of these processes, say P4, then P4 release all the resources it is holding. Show one sequence of events in which resources are allocated to the 4 processes and the resulting preemptions, if any, until all new requests are serviced. Current allocations are shown below. Each resource has 4 instances. Try to minimize the preemptions as they are expensive. Process ID Process Priority Current allocation New request R1 R2 R1 R2 P1 1 2 1 2 1 P2 3 0 1 1 0 P3 2 1 1 0 1 P4 4 1 1 2 1
Considering a system with five processes P0 through P4 and four resources of type A, B, C,D. Suppose at time t0 following snapshot of the system has been taken: Allocation A B C D Max A B C D Available A B C D P0 0 0 1 1 0 0 1 2 1 4 2 1 P1 10 0 0 1 7 5 0 P2 1 3 5 4 2 3 5 6 P3 0 6 3 2 0 6 5 2 P4 0 1 1 4 0 6 5 6 Answer the following questions using the banker’s algorithm: What is the content of the matrix Need? Is the system in a safe state? Find the safe sequence If a request from process P1 arrives for (0,4,2,0), can the request be granted immediately?