Synchronization: The wait() and signal() methods of a semaphore S are defined as follows: wait (S) { while (S <= 0) signal(S) { S++; } ; //no-operation S-- } In wait(), the testing of S (i.e., S <= 0) and its possible modifications (S--) must be atomic (executed without interruption). Use an execution sequence to show that if S-- is not atomic, then the mutual exclusion of critical section cannot be preserved. The initial value of S is 1. Hint: S-- may be implemented in machine language as register1 = S register1 = regester1 1 S = regester1

Synchronization: The wait() and signal() methods of a semaphore S are defined as follows: wait (S) { while (S <= 0) signal(S) { S++; } ; //no-operation S-- } In wait(), the testing of S (i.e., S <= 0) and its possible modifications (S--) must be atomic (executed without interruption). Use an execution sequence to show that if S-- is not atomic, then the mutual exclusion of critical section cannot be preserved. The initial value of S is 1. Hint: S-- may be implemented in machine language as register1 = S register1 = regester1 1 S = regester1

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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