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a) Why must "wait(mutex)" be the last wait performed? The wait mutex has to be last performed because the mutex handles the traffic of signals & processes. b) Why does the program on the left wait on the "empty" semaphore, but signal the "full" semaphore? It does that to handle the order of ✓ processes to limit traffic and output time & the precedence relation, c) Why was the "mutex" semaphore added? (What is its purpose?) Х The mutex helps mitigate the Semaphore processes

a) Why must "wait(mutex)" be the last wait performed? The wait mutex has to be last performed because the mutex handles the traffic of signals & processes. b) Why does the program on the left wait on the "empty" semaphore, but signal the "full" semaphore? It does that to handle the order of ✓ processes to limit traffic and output time & the precedence relation, c) Why was the "mutex" semaphore added? (What is its purpose?) Х The mutex helps mitigate the Semaphore processes

Computer Networking: A Top-Down Approach (7th Edition)
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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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); ii remove item from item_buffer; signal (mutex); signal (empty); 11 consume the item }
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); ii remove item from item_buffer; signal (mutex); signal (empty); 11 consume the item }
a) Why must "wait(mutex)" be the last wait performed? The wait mutex has to be last performed because the mutex handles the traffic of signals & processes. b) Why does the program on the left wait on the "empty" semaphore, but signal the "full" semaphore? It does that to handle the order of ✓ processes to limit traffic and time & the precedence relation, c) Why was the "mutex" semaphore added? (What is its purpose?) Х The mutex helps mitigate the Semaphore processes output
Transcribed Image Text:a) Why must "wait(mutex)" be the last wait performed? The wait mutex has to be last performed because the mutex handles the traffic of signals & processes. b) Why does the program on the left wait on the "empty" semaphore, but signal the "full" semaphore? It does that to handle the order of ✓ processes to limit traffic and time & the precedence relation, c) Why was the "mutex" semaphore added? (What is its purpose?) Х The mutex helps mitigate the Semaphore processes output
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