Subject: Computer Science 2. Consider five processes Po through P4; four resources A, B, C and D. At time t the snapshot of thesystem is shown in Table 1.Table 1: Resources and allocation informationAvailableProcess/RMax AllocationAllocationResourcesesourcesA BCD5 2A BCD0 4 3 1|ABCDo 21 1Ро8.P116.4 21111 2 03 1 2 1o 1 2 3P235P3122P454 61Answer the following questions using Bankers algorithm(i) Is the system in a safe state?(ii) If so, show a safe order in which all the processes can run to completion.(iii) Use the Banker's algorithm to determine if a request of (o, 1, 1, 0) for (A, B, C, D), made by processP2 can be granted safely without a possible deadlock.

1) Let calculate the need of each process P0(0, 4,2,1) P1(0, 5,3,2) P2(0, 2,3,0) P3(0, 0,0,1)…

2. Consider five processes Po through P4; four resources A, B, C and D. At time t the snapshot of th system is shown in Table 1. Table 1: Resources and allocation information Available Resources ABCD o211 Process/R Max Allocation Allocation esources A B ABCD 0 4 3 1 111 o O 1 2 0 3 1 2 1 o 12 CD 8 5 6 4 3 5 0 3 1 5 4 6 Ро P1 2 P2 P3 2 P4 1 Answer the following questions using Bankers algorithm (i) Is the system in a safe state? (ii) If so, show a safe order in which all the processes can run to completion. (iii) Use the Banker's algorithm to determine if a request of (o, 1, 1, 0) for (A, B, C, D), made by proces P2 can be granted safely without a possible deadlock.

2. Consider five processes Po through P4; four resources A, B, C and D. At time t the snapshot of th system is shown in Table 1. Table 1: Resources and allocation information Available Resources ABCD o211 Process/R Max Allocation Allocation esources A B ABCD 0 4 3 1 111 o O 1 2 0 3 1 2 1 o 12 CD 8 5 6 4 3 5 0 3 1 5 4 6 Ро P1 2 P2 P3 2 P4 1 Answer the following questions using Bankers algorithm (i) Is the system in a safe state? (ii) If so, show a safe order in which all the processes can run to completion. (iii) Use the Banker's algorithm to determine if a request of (o, 1, 1, 0) for (A, B, C, D), made by proces P2 can be granted safely without a possible deadlock.

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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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.
Hey please answer the sample question attached below.
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…
Suppose there are two Processes B1 and B2. There is one instance of Resource R1 and two instances of R2. • 81 holds Resource R1 and requesting for Resource R2. • B2 holds Resource R2 and requesting for Resource R1. Consider the scenario in terms of Deadlocks. You may consider drawing a Resource Allocation Graph for the above scenario. (No Upload.Only write answers for a) and b) in the box given below) a) What kind of situation does the graph shows (Deadlock or No Deadlock)? b) Justify(reason) your answer to question (a). A- B I
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Consider the following table as a snapshot of resources in a system: A (10 instances), B (5 instances), and C (7 instances). a) Write down the calculation steps to find a Safe/Unsafe state: b) Is this system in a safe state? If so, write the safe sequence. Allocation Max Available АВС АВС 332 Po P1 P2 P3 PA 010 753 200 322 302 902 211 222 002 433
Consider the following set of processes, each of which needs a certain amount of a series of shared resources (denoted as resources A, B, and C) to complete its work. The following chart shows the state of the system at a given point in time: Process Allocation Request Available A B C A B C A B C P0 1 1 1 1 0 0 0 0 0 P1 2 0 1 0 0 0 P2 0 1 0 0 0 2 P3 4 0 1 0 3 0 P4 0 2 0 4 0 2 Suppose that a process will hold all resources it has until it obtains all the resources it needs. Once it obtains all the resources it needs, it will complete its work and release all of the resources back into the available pool. Is there an order of execution for these processes that will lead to them all finishing their work, or will the system end up in a deadlocked state? If the system will end up in a deadlocked state, please explain why this deadlock will occur. You do not have to show any work for this question, just provide an…
Q3. Consider a system with five processes P0, P1, P2, P3 and P4 and four resources types A, B, C and D. Resource type A has 4 instances, resource type B has 3 instances, resource type C has 1 instance and resource type D has 2 instances. P0 holds an instance of A and requests an instance of B and D. P1 holds an instance of B and requests an instance of A and C. P2 holds an instance of C and requests an instance of A. P3 holds an instance of D and requests an instance of B and C. P4 holds an instance of A. Draw a directed resources allocation graph to represent the above system state.
Please answer question b and show all the work.
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
Computer Science
Consider a system consisting of 5 processes, P = {P1, P2, P3, P4, P5} and 3 resources types, R = {R1, R2, R3}. The number of instances for each resource type are 2, 2 and 1 respectively. The state of the system at time, it is described as follow: P1 requests an instance of R2 P2 requests an instance of R1 P3 requests an instance of R2 and holds an instance of R1 and an instance of R3 P4 requests an instance of R3 P5 holds all instances of R2 Assuming that all resources are non-sharable, construct a Resource Allocation Graph to depict the process state.