Consider a system with five processes, PO →P4, three resource types, A, B, C. Type A has 9 instances, Bhas 6 instances, C has 6 instances. At time To the following snapshot of the system is taken.Max NeedAvailableAllocated|A В С A В С А В с1 132 2POP1272 4 1P2P3P40 24 3O 2O 21.2053 33 2 0(You may write down the steps and all answers in a paper and upload)a) Is the system in a safe state?b)Write the Sequencec)Calculate Need matrixd)Write the steps, that leads to your conclusion.

Consider a system with five processes, PO P4, three resource types, A, B, C. Type A has 9 instances, B has 6 instances, C has 6 instances. At time To the following snapshot of the system is taken. Max Need A Allocated Available A B PO 2 2 3 2 4 1 2 P1 P2 2 4 3 2 P3 4 3 2 P4 2 (You may write down the steps and all answers in a paper and upload) a) Is the system in a safe state? b)Write the Sequence c)Calculate Need matrix d)Write the steps, that leads to your conclusion.

Consider a system with five processes, PO P4, three resource types, A, B, C. Type A has 9 instances, B has 6 instances, C has 6 instances. At time To the following snapshot of the system is taken. Max Need A Allocated Available A B PO 2 2 3 2 4 1 2 P1 P2 2 4 3 2 P3 4 3 2 P4 2 (You may write down the steps and all answers in a paper and upload) a) Is the system in a safe state? b)Write the Sequence c)Calculate Need matrix d)Write the steps, that leads to your conclusion.

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 system with five processes, PO →P4, three resource types, A, B, C. Type A has 9 instances, B has 6 instances, C has 6 instances. At time To the following snapshot of the system is taken. Available В С 1 Max Need Allocated A A PO 2 2 P1 7 C 1 2 1 4. 3 P2 4 2 P3 4 3 2 1 P4 3 2 (You may write down the steps and all answers in a paper and upload) a) Is the system in a safe state? b)Write the Sequence c)Calculate Need matrix d)Write the steps, that leads to your conclusion.
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.
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 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 seven processes, A though G, and six resources, R through W. The state of which resources are currently owned and which ones are currently being requested is as follows: 1. ProcessA holds R and wants S. 2. Process B holds nothing but wants T. 3. Process C holds nothing but wants S. 4. Process D holds U and wants S and T. 5. Process E holds T and wants V. 6. Process F holds W and wants S. 7. Process G holds V and wants U. Which of the following statements is true O There is no deadlock O There is deadlock, and it involves processes D, E, and G only O There is deadlock, and it involves processes A, D, and G only O There is deadlock, and it involves processes A, D, E, F, and G only.
Consider a system consisting of m resources of the same type being shared by n processes, n > m. Each process has a maximum need of m/2 resources. Initially, each process has no resource requests. A process can request or release only one resource at a time. With n=3k and m=2k, for some integer k, show that the system is deadlock free.
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
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.
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
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?
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?