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?

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?

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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consider a computer system involving 4 processes P1,P2,P3,P4, and 3 different types of resources R1,R2,R3. Assume that 2 instances of R1, 3 instances of R2 and 2 instances of R3 exist (either idle or in use). Assume that: • P1 is holding two instances of R1 and one instance from R2. It is waiting for an instance from R2 and one instance from R3. • P2 is holding an instance of R2 and one instance from R3. It is waiting for an instance from R1. • P3 is holding an instance of R3. • P4 is holding an instance of R2 and waiting for an instance from R3. Draw the resource allocation graph for this system and apply the deadlock detection algorithm to show whether there is a deadlock or not. Clearly show the applied steps.
Consider a computer system with the following allocation status for four non-sharable resources, A, B, C, D at a certain time: Allocation Max Available АВCD АВCD АВCD PO 0101 8532 2301 3020 P2 3021 P1 3220 6022 At this instant, P0 requests (0, 2, 0, 1). The Operating System applies Banker's Algorithm to decide whether or not to grant this request. Mark all the correct statements below based on this scenario: O Need (2) = 3001 The system is currently deadlocked. Granting this request brings the system to a safe state. First row of Allocation matrix becomes 0302. O Need (0) = 8230 Available vector becomes 2100. O Need (1) = 0200 %3D
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.
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.
An operating system has 3 user processes running in a set, each requiring 2 units of resource R. The minimum number of units of R such that no deadlocks will ever arise is:
consider a computer system involving 4 processes P1,P2,P3,P4, and 3 different types of resources R1,R2,R3. Assume that 2 instances of R1,3 instances of R2 and 2 instances of R3 exist (either idle or in use). Assume that: • Pl is holding two instances of R1 and one instance from R2. It is waiting for an instance from R2 and one instance from R3. • P2 is holding an instance of R2 and one instance from R3. It is waiting for an instance from R1. • P3 is holding an instance of R3. • P4 is holding an instance of R2 and waiting for an instance from R3. Draw the resource allocation graph for this system and apply the deadlock detection algorithm to show whether there is a deadlock or not. Clearly show the applied steps.
An operating system has a total of three user processes, and each of these processes uses a total of two units of the resource R. The total number of units that R is used up by the operating system is twelve. The absolute minimal number of R units that must be used to eliminate the possibility of any deadlocks happening is
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?
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.
(i) Describe Banker’s algorithm for deadlock avoidance with supporting example Consider a computer system with 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 anyway, that is, two in one shot or one by one. The system always satisfies a request a request for a resource if enough resources are available. If the process doesn’t request any other kind of resource, show that the system never deadlock Give a solution for the following synchronization problem using semaphores Producer- Consumer Problem Readers- Writers Problem List out the issues in preprocessor scheduling that causes performance degradation in multiprocessor systems
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…
An operating system uses the Banker's algorithm for deadlock avoidance when managing the allocation of three resource types X, Ý, and Z to three processes PO, P1, and P2. The table given below presents the current system state. There are 3 instances of type X, 2 instances of type Y and 2 instances of type Z still available. The system is currently in a safe state. Answer the following questions! Allocation Max X Y z X Y PO 0 1 8 4 3 (a) If PO requests 2 instances of Z during the P1 3 2 current state, can it be granted? Explain! (b) If P1 requests 2 instances of X during the P2 2 1 1 3 3 3 current state, can it be granted? Explain! CO