Consider the following two programs in a shared address space. Remember that semaphores are signals (like the flags and lights that railroads use) item buffer [5]; semaphore full (0); semaphore empty (5); semaphore mutex; while (1) { // produce next item to store wait (empty); wait (mutex); // add item to item_buffer signal (mutex); signal (full); while (1) { wait (full); wait (mutex); // remove item from item_buffer; signal (mutex); signal (empty); 11 consume the item } Why must "wait(mutex)" be the last wait performed? • Why does the program on the left wait on the "empty" semaphore, but signal the "full" semaphore? • Why was the "mutex" semaphore added? (What is its purpose?)
Consider the following two programs in a shared address space. Remember that semaphores are signals (like the flags and lights that railroads use) item buffer [5]; semaphore full (0); semaphore empty (5); semaphore mutex; while (1) { // produce next item to store wait (empty); wait (mutex); // add item to item_buffer signal (mutex); signal (full); while (1) { wait (full); wait (mutex); // remove item from item_buffer; signal (mutex); signal (empty); 11 consume the item } Why must "wait(mutex)" be the last wait performed? • Why does the program on the left wait on the "empty" semaphore, but signal the "full" semaphore? • Why was the "mutex" semaphore added? (What is its purpose?)
C++ Programming: From Problem Analysis to Program Design
8th Edition
ISBN:9781337102087
Author:D. S. Malik
Publisher:D. S. Malik
Chapter12: Points, Classes, Virtual Functions And Abstract Classes
Section: Chapter Questions
Problem 19SA
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Please provide answer with step by step instructions on how to do it. Please also answer the bullet points.
![Consider the following two programs in a shared address space. Remember that semaphores are signals
(like the flags and lights that railroads use)
item buffer [5];
semaphore full (0);
semaphore empty (5);
semaphore mutex;
while (1)
{
// produce next item to store
wait (empty);
wait (mutex);
// add item to item_buffer
signal (mutex);
signal (full);
while (1)
{
wait (full);
wait (mutex);
// remove item from item_buffer;
signal (mutex);
signal (empty);
11 consume the item
}
Why must "wait(mutex)" be the last wait performed?
• Why does the program on the left wait on the "empty" semaphore, but signal the "full"
semaphore?
• Why was the "mutex" semaphore added? (What is its purpose?)](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F4217e83c-b4b2-47da-9d7a-2d6031448fca%2F749303d6-ba38-4b42-944e-67ce4cfe8dab%2Fuhm5s5m_processed.png&w=3840&q=75)
Transcribed Image Text:Consider the following two programs in a shared address space. Remember that semaphores are signals
(like the flags and lights that railroads use)
item buffer [5];
semaphore full (0);
semaphore empty (5);
semaphore mutex;
while (1)
{
// produce next item to store
wait (empty);
wait (mutex);
// add item to item_buffer
signal (mutex);
signal (full);
while (1)
{
wait (full);
wait (mutex);
// remove item from item_buffer;
signal (mutex);
signal (empty);
11 consume the item
}
Why must "wait(mutex)" be the last wait performed?
• Why does the program on the left wait on the "empty" semaphore, but signal the "full"
semaphore?
• Why was the "mutex" semaphore added? (What is its purpose?)
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