Consider the following snapshot of a system:AllocationМаxAvailableABCDABCDABCDPO200142123321P131215252P221032316P313121424P414323665Answer the following questions using the banker's algorithm:a. llustrate that the system is in a safe state by demonstrating an order in which the processes maycomplete.b. If a request from process P1 arrives for (1, 1, 0, 0), can the request be granted immediately?c.Ifa request from process P4 arrives for (0, 0, 2, 0), can the request be granted immediately?Show transcribed image text

Answered: Consider the following snapshot of a…

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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Solve the following bankers Algorithm and find a save sequence 5 processes P0 P1 P2 P3 P4; 3 resource types A (20 instances), B (10 instances), and C (14 instances). Snapshot at time T0: Allocation Max Available A B C A B C A B C P0 0 2 0 14 10 3 6 6 4 P1 4 0 0 6 4 4 P2 6 0 4 18 0 4 P3 4 2 2 4 4 4 P4 0 0 4 8 6 6
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 the following snapshot of a system: Allocation Max Available A B C D A B C D A B C D T0 3 1 4 1 6 4 7 3 2 2 2 4T1 2 1 0 2 4 2 3 2T2 2 4 1 3 2 5 3 3T3 4 1 1 0 6 3 3 2T4 2 2 2 1 5 6 7 5 Answer the following questions using the banker’s algorithm: Illustrate that the system is in a safe state by demonstrating anorder in which the threads may complete. If a request from thread T4 arrives for (2, 2, 2, 4), can the request begranted immediately? If a request from thread T2 arrives for (0, 1, 1, 0), can the request begranted immediately? If a request from thread T3 arrives for (2, 2, 1, 2), can the request begranted immediately? Given six memory partitions of 100 MB, 170 MB, 40 MB, 205 MB, 300 MB, and 185 MB…
(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
Consider the following snapshot of a system: Allocation Max Available A B C D A B C D A B C DT0 3 1 4 1 6 4 7 3 2 2 2 4T1 2 1 0 2 4 2 3 2T2 2 4 1 3 2 5 3 3T3 4 1 1 0 6 3 3 2T4 2 2 2 1 5 6 7 5Answer the following questions using the banker’s algorithm:a. Illustrate that the system is in a safe state by demonstrating anorder in which the threads may complete.b. If a request from thread T4 arrives for (2, 2, 2, 4), can the request begranted immediately?c. If a request from thread T2 arrives for (0, 1, 1, 0), can the request begranted immediately?d. If a request from thread T3 arrives for (2, 2, 1, 2), can the request begranted immediately?
Consider the following snapshot of a system: ALLOCATION MAX AVAILABLE A B C D A B C D A B C D P0 3 2 1 4 3 4 2 7 4 4 3 1 P1 2 5 4 3 4 7 7 6 P2 3 1 1 2 5 3 2 3 P3 2 4 2 3 2 5 3 5 P4 4 2 3 2 6 3 6 3 Answer the following questions using the banker’s algorithm: Illustrate that the system is in a safe state by demonstrating an order in which the processes may complete. If a request from process P4 arrives for (2,2,1,1), can the request be granted immediately? If a request from process P1 arrives for (1,1,3,1), can the request be granted immediately?
For mutual exclusion with a preemptive scheduler, it is necessary to introduce explicit locks, and machinery that makes requesting processes wait when a lock is unavailable. We considered casting our locks as semaphores, but decided that, compared with monitors, they exert too little structuring discipline on concurrent programs." How do semaphores "exert too little structuring discipline" and how is this remedied by monitors? Construct an example to show how the structuring discipline exerted by monitors could be useful. Please dont post the answer which is already available on website, Also I need the answer for the montior exert on structuring of the program
For mutual exclusion with a preemptive scheduler, it is necessary to introduce explicit locks, and machinery that makes requesting processes wait when a lock is unavailable. We considered casting our locks as semaphores, but decided that, compared with monitors, they exert too little structuring discipline on concurrent programs." How do semaphores "exert too little structuring discipline" and how is this remedied by monitors? Construct an example to show how the structuring discipline exerted by monitors could be useful. Please write the code of the montior remedies for the structuring discipline exerted by monitor
For mutual exclusion with a preemptive scheduler, it is necessary to introduce explicit locks, and machinery that makes requesting processes wait when a lock is unavailable. We considered casting our locks as semaphores, but decided that, compared with monitors, they exert too little structuring discipline on concurrent programs." How do semaphores "exert too little structuring discipline" and how is this remedied by monitors? Construct an example to show how the structuring discipline exerted by monitors could be useful. Please explain in detail with code example for monitors structuring discipline >?
Consider the following snapshot of a system: Allocation Max Available A B C D A B C D A B C D P0 2 0 0 1 4 2 1 2 3 3 2 1 P1 3 1 2 1 5 2 5 2 P2 2 1 0 3 2 3 1 6 P3 1 3 1 2 1 4 2 4 P4 1 4 3 2 3 6 6 5 Answer the following questions using the banker’s algorithm: a. Illustrate that the system is in a safe state by demonstrating an order in which the processes may complete. b. If a request from process P1 arrives for (1, 1, 0, 0), can the request be granted immediately? c. If a request from process P4 arrives for (0, 0, 2, 0), can the request be granted immediately?
(2)How many safe sequences are there for the above snapshot? Briefly justify your answer. (3)If P1 requests an additional instance of each of A and C, that is, P1's request becomes (2, 4, 6), will this request result in a deadlock? If the answer is no, give a safe sequence. If the answer is yes, identify the processes that will be involved in the deadlock. Show your work.
Consider the schedule S given below S: r₁(X); r₂(Y); r₂(X); r₂(Y); r₂(Z); w₂(Y); w₂(Z); r₁(Z); w₁(x); w₁(Z) Find schedule is conflict serializable or not.

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