There are 4 processes – PO, P1,P2,P3 and three resources A,B,C are available. The resource A has 9, B has 4 instances, C has 5 instances. Use Banker's algorithm to find out whether the system is in safe state or not. Max Allocation Need Available A B A A C A B C PO 3 3 2 2 1 1 4 P1 3 1 1 13 1 P2 5 1 2 P3 2 1 2 1 i) Calculate the need matrix ii) Identify the safe sequence U-O o o

There are 4 processes – PO, P1,P2,P3 and three resources A,B,C are available. The resource A has 9, B has 4 instances, C has 5 instances. Use Banker's algorithm to find out whether the system is in safe state or not. Max Allocation Need Available A B A A C A B C PO 3 3 2 2 1 1 4 P1 3 1 1 13 1 P2 5 1 2 P3 2 1 2 1 i) Calculate the need matrix ii) Identify the safe sequence U-O o o

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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a. Three processes share four resource units that can be reserved and released only one at a time. Each process needs a maximum of two units. Show that a deadlock cannot occur. b. N processes share M resource units that can be reserved and released only one at a time. The maximum need of each process does not exceed M, and the sum of all maximum needs is less than M + N. Show that a deadlock cannot occur.
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QUESTION 3 Suppose the system has 4 processes and 3 resources At time T15 the snapsbot of the system is taken and given below which of the following options is a safe sequence? Total number of resources-12, 8, 6 Available number of resources-0, 3, 1 Allocation matrie P1 P1 2. P2 1. P2 2. P4 2 P4 O P1. P2. P3, P4 O P4, P1, P3. P2 P1, P3, P2, P4 No safe sequence Saut Arpe Cese Click Save and Submit to save and submit. Click Save All Ansuvers to save all aners, OAC
Consider the following snapshot of a system: Allocation Max Available A B C D A B C D A B C D T0 2 1 0 6 6 3 2 7 2 1 3 1 T1 3 3 1 3 5 4 1 5 T2 2 3 1 2 6 6 1 4 T3 1 2 3 4 4 3 4 5 T4 3 0 3 0 7 2 6 1 What are the total resources for A, B, C and D respectively? Select one: a.11, 10, 8, 16 b. 13, 10, 11, 16 c.11, 9, 8, 15 d.28, 18, 14, 22
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Draw resource allocation graph and explain if the system is in a deadlock or not? • Given 3 processes P1, P2, P3 and 3 resources RI, R2and R3 with I instance each. • Process P1 Holding a resource R1 and requesting for Resource R2. • Process P2 holding resource R2. Process P3 holding resource R3 and requesting for R2.
The state of resource A,B,C,D is given: Pno Allocation Max Available P0 0012 0112 1540 P1 1000 1750 P2 1354 2356 P3 0014 0656 If P1 max is ( 0,3,1,0), whether it can be satisfied? If can, give one safe sequence?
An operating system uses a total of two units of the resource R for each of its three user processes. The operating system uses a total of 12 units of R. The absolute minimum number of R units that must be used to guarantee that there are no deadlocks is
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.
The following resource-allocation graph illustrates a deadlock. R₁ True False Ţ₁ T3 L Ţ₂ T₁ R₂
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a. Three processes share four resource units that can be reserved and released only one at a time. Each process needs a maximum of two units. Show that a deadlock cannot occur. b. N processes share M resource units that can be reserved and released only one at a time. The maximum need of each process does not exceed M, and the sum of all maximum needs is less than M + N. Show that a deadlock cannot occur.