Consider the matrix tables below and answer the following questions: Claim Allocation Available B C D B C D A B A P1 4 7 5 P1 4 2 5 1 40 1 P2 4 1 P2 2 0 1 P3 1 3 1 2 P3 1 2 1 P4 9 4 2 3 P4 6 3 2 1 b) Is the system in a safe state? If yes, state the sequence of processes executed that will lead the system into a safe state. A52 A 5 WNACC 4 D321 C D

Consider the matrix tables below and answer the following questions: Claim Allocation Available B C D B C D A B A P1 4 7 5 P1 4 2 5 1 40 1 P2 4 1 P2 2 0 1 P3 1 3 1 2 P3 1 2 1 P4 9 4 2 3 P4 6 3 2 1 b) Is the system in a safe state? If yes, state the sequence of processes executed that will lead the system into a safe state. A52 A 5 WNACC 4 D321 C D

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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There are 4 processes - P1, P2, P3, P4 and three resources A, B, C are available. The resource A has 7 instances, B has 5 instances, C has 3 instances. Use Banker's algorithm to find out whether the system is in safe state or not. i) Calculate the need matrix ii) Identify the safe sequence and update the available table. Max Allocation Need Available A A B A B C A P1 5 1 1 P2 1 P3 1 1 1 P4 2 1 2 2. B. 2. 2.
Assume that resource R1 is assigned a unique ID of 2 and resource R2 is assigned a unique ID of 5, There are 3 instances each of R1 and R2. Suppose that deadlock condition is avoided by ensuring no circular-wait. Given the following scenario, with 4 processes (P1-P4) along with the resource allocations, (i) Does the given scenario satisfy the NO circular-wait condition? Justify. (ii) Is there a deadlock? Justify Process ID P1 P2 P3 P4 Current allocation R1 1 0 1 0 R2 1 1 0 0 New request R1 0 0 1 2 R2 1 1 0 0
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| Given specifications of a system below. Find a Safe Sequence(s) if it contains using Banker's and Safety Algorithm. Total Resources: R1: 15, R2:10, R3: 8, R4: 13 Need Маx Processes R1 R2 R3 R4 R2 R3 R4 R1 PO 1 1 4 1 3 3 6 3 P1 2 3 3 4 P2 1 1 2 2 1 4 P3 1 1 5 2 2 8 P4 2 1 1 1 3 2 3 2
Please answer the following questions related to Detection Algorithm. Given the below information, fill out Matrixes Request and Work. • Five processes P, through Pa; three resource types A (7 instances), B (2 instances), and C (6 instances) Snapshot at time To: Allocation Request Available Request satisfy safety criteria? Why??
Consider a system with five processes (P1-P5) and four resources (R1-R4) where R1 has 3, R2 has 8, R3 has 6 and R4 has 6 instances. By considering the snapshot of the system given below: a. What is the content of the matrix Need? b. What is the content of the vector Available? Allocation Max R1 R2 R3 R4 R1 R2 R3 R4 P1 1 1 2 P2 1 6. 5 2 P3 1 6 6 P4 1 1 P5 4. 1 7 6, 2. LO 3. 2. 3. 3.
Given specifications of a system below. Find a Safe Sequence(s) if it contains using Banker’s and Safety Algorithm. Total Resources: R1: 15, R2:10, R3: 8, R4: 13 Need Max Processes R1 R2 R3 R4 R1 R2 R3 R4 P0 1 1 4 1 3 3 6 3 P1 0 2 5 3 6 3 5 4 P2 1 3 1 2 2 5 1 4 P3 1 1 0 5 5 2 2 8 P4 2 1 1 1 3 2 3 2
Consider a system consisting of four processes and a single resource. The current state of the claim and allocation matrices are 44 A = What is the minimum number of units of the resource needed to be available for this state to be safe?
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Table 1. 4 processes arriving shown in Operating System Scheduling PDF for Shortest Job Next, non- preemptive Process Arrival Times Execution Times Service Times sequence Wait Times calculations PO 0 12 P1 21 9 P2 41 6 P3 6 3 Total wait time = ? Here the 4 processes of the PDF are repeated in Table 1, with arrival times changed to 0, 2, 4, and 6 respectively. Also, the execution times are changed to 12, 9, 6, and 3. You will be asked to fill table 1 with the numbers like the service times (when is each process serviced), the sequence of executions of these 4 processes in part (a) and part (b) below. Also, you will compute the total wait time. Note for FCFS, it is 1, 2, 3, 4 for P0, P1, P2, and P3; • for the SJN or Shortest Job Next with non-preemptive, PO is #1, P1 may not be #2; for SRT, or shortest remaining time, the preemptive version of SJN, PO is #1, but after 2 time units when P1 comes, P1 kicks out PO since its execution time is 4 < 9- 2 = 7; and P1 may be preempted by P2 later…
In the following resource allocation graph, are the processes deadlocked? If “yes” explain why and state which processes are involved in deadlock. If “not” explain why.
Consider the following snapshot of a system: Allocation Маx Available ABCD ABCD ABCD PO 2001 4212 3321 P1 3121 5252 P2 2103 2316 P3 1312 1424 P4 1432 3665 a. Illustrate that the system is in a safe state by demonstrating an order in which the processes may complete.