Operating System 1. Consider the following system (see Table1) with FIVE (5) processes Po through P4 andFOUR(4) resources of type A, B, Cand D. At time To the following snapshot of the systemwas taken.Table1Process AllocationМaxAvailableА В С D A В С D A в | с| D4 012 8 0 2 3 1 2103 1103 2 110 010 01 2 01 2 2 177 22 1413 3 6 1PoP1P2P3P4Use the Banker's algorithm to determine whether the system is in a safe state. Show asafe sequence if one exists. Show all the working.

Using the banker's algorithm to defined the system is in safe state with safe sequence

Answered: 1. Consider the following system (see…

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 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.
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.
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…
Suppose that an operating system supports two kinds of sequential processes: high-priority interactive processes, and low-priority non-interactive processes. The behavior of the high-priority processes is to alternate between periods of computation of duration Tc and periods of blocking (waiting for input) of duration Tb. The behavior of the low-priority processes is to compute constantly, with no blocking. The operating system’s scheduling policy is round-robin with a quantum q, where Tc < q. Scheduling decisions are made only when a quantum expires, or when the running process blocks. The scheduler selects a low-priority process to run only if no high-priority processes are ready. Suppose there is one high-priority process and one low-priority process in the system, and that both processes will run for a long time. For what fraction of the time does the low-priority process run?
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Question#4 Consider a system with five processes Po through P4; three resource types A (7 instances), B (2 instances), and C (6 instances). Answer the following questions using below CPU Snapshot: Allocation Request АВС Available АВС АВС Ро 010 000 0 00 20 2 00 1 P1 200 P2 303 P3 211 100 P4 00 2 0 0 2 1. Test the safe state sequence. 2. Discuss the possibility of recovering from the deadlock with context to the given case.
26. A system has four processes and five allocatable resources. The current allocation and maximum needs are as follows: Available 00 x 1 1 Allocated Махітит Process A 10 211 11213 Process B 20110 22210 Process C Process D 11010 21310 1111 0 11221 What is the smallest value of x for which this is a safe state?
Consider a computer environment in which there are 4 magnetic drives, 2 printers, 3 scanners, and 1 optical drive. Three processes P1, P2, P3 are using these resources. At any point in time, the allocations and requests for these resources are as follows. Allocations: Magnetic drive Printer Scanner Optical drive P1 1 P2 2 1 P3 1 Requests: Magnetic drive 2 Printer Scanner Optical drive P1 1 P2 1 1 P3 2 1 Is there any way that the processes can complete without deadlock? If yes, explain how. If not, explain why not.
Hey please answer the sample question attached below.
Consider a system consisting of four processes and a single resource. The total resource before any allocation occurs is 20. The current state of the claim vector is C = (3, 2, 8, 6) and the allocation vector is A = (1, 1, 3, 2). If "Process Initiation Denial" is used as the Deadlock Avoidance policy, should a new process with 2 maximum claim be initiated? O Yes O No
There are 3 resources R1, R2 and R3 with one instance each and three processes P1, P2 and P3 in an operating system. A snapshot of the system resource allocation graph shows the following: R1 is allocated to P2; R2 is allocated to P1; R3 is allocated to P3; P1 requests R1; P2 requests R3; P3 requests R2. Which of the following is true about this system? answer ) a)Undetermined b)There is deadlock in the system c)Deadlock will never happen d)There is no deadlock in the system

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