During online class we studied that, if the semaphore operations Wait and Signal are not executed atomically, then mutual exclusion may be violated. Assume that Wait and Signal are implemented as below: void Wait (Semaphore S) { while (S.count <= 0) {} s.count = s.count - 1; void Signal (Semaphore S) { S.count = s.count + 1; Code: (a) a) Build a scenario of context switches that includes two threads and permit to enter a critical section secured by a single mutex semaphore as a result of a lack of atomicity. wait(S) = {while S < 0; S--; } signal(S) = {S++;} Code: (b) b) Assume, S=1, P & Q protects a critical region with the semaphore S. Show that if one of these operations is not executed atomically, we may violate mutual exclusion.

During online class we studied that, if the semaphore operations Wait and Signal are not executed atomically, then mutual exclusion may be violated. Assume that Wait and Signal are implemented as below: void Wait (Semaphore S) { while (S.count <= 0) {} s.count = s.count - 1; void Signal (Semaphore S) { S.count = s.count + 1; Code: (a) a) Build a scenario of context switches that includes two threads and permit to enter a critical section secured by a single mutex semaphore as a result of a lack of atomicity. wait(S) = {while S < 0; S--; } signal(S) = {S++;} Code: (b) b) Assume, S=1, P & Q protects a critical region with the semaphore S. Show that if one of these operations is not executed atomically, we may violate mutual exclusion.

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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