Consider the following code relating to condition variables from your textbook: and 6 7 . 9 10 18 19 20 21 22 void thr_exit() ( Pthread_mutex lock (6m); done = 1; Pthread_cond_signal(&c); Pthread_mutex_unlock (6m); void thr_join () { Pthread_mutex_lock (6m); while (done == 0) Pthread_cond_wait (&c, &m); Pthread_mutex_unlock (6m); Note the presence of a • variable (done), • a mutex (m), • a condition variable (c), and • a while loop all of which are necessary to get this to work correctly. a. Please explain why we need the variable (i.e., what might occur or what additional code might be needed if we omit the variable) b. Please explain why we need the mutex (same comment) c. Please explain why we need the condition variable d. Please explain why we need a while loop instead of an if statement Please keep your answers short and to the point. You might wish to show a schedule that might occur without each of these, should that be the best way to explain it concisely.

Consider the following code relating to condition variables from your textbook: and 6 7 . 9 10 18 19 20 21 22 void thr_exit() ( Pthread_mutex lock (6m); done = 1; Pthread_cond_signal(&c); Pthread_mutex_unlock (6m); void thr_join () { Pthread_mutex_lock (6m); while (done == 0) Pthread_cond_wait (&c, &m); Pthread_mutex_unlock (6m); Note the presence of a • variable (done), • a mutex (m), • a condition variable (c), and • a while loop all of which are necessary to get this to work correctly. a. Please explain why we need the variable (i.e., what might occur or what additional code might be needed if we omit the variable) b. Please explain why we need the mutex (same comment) c. Please explain why we need the condition variable d. Please explain why we need a while loop instead of an if statement Please keep your answers short and to the point. You might wish to show a schedule that might occur without each of these, should that be the best way to explain it concisely.

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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