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2) Consider the semaphore solution for the producer/consumer problem with a buffer of n elements. common variables: semaphore A = ?; semaphore B = ?; semaphore C = ?; %3D the buffox

2) Consider the semaphore solution for the producer/consumer problem with a buffer of n elements. common variables: semaphore A = ?; semaphore B = ?; semaphore C = ?; %3D the buffox

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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2) Consider the semaphore solution for the producer/consumer problem with a buffer of n elements. common variables: semaphore A = ?; semaphore B = ?; semaphore C = ?; the buffer, initialized as an empty fifo queue code for producers: while (true) { produce (); wait (A); wait (C); putiteminbuffer (); signal (C); signal (B); code for consumers: while (true) { wait (B); wait (C); takeitemfrombuffer (); signal (C); signal (A); consume (); 5 initialization choices for the semaphores are listed below. Which of the 5 choices yield a correct solution? For each choice that leads to an incorrect solution, answer the following 2 questions: Can deadlock occur? Can there be errors in how items are consumed? Choice #1: A = n, B = 0, C = 0 Choice #2: A = n, B = 0, C =1 Choice #3: A = 0, B = n, C = 1 Choice #4: A = 0, B = 0, C= 1 Choice #5: A = n, B = 0, C= 2 Please write the explanation for each choice one by one. Thanks.
Transcribed Image Text:2) Consider the semaphore solution for the producer/consumer problem with a buffer of n elements. common variables: semaphore A = ?; semaphore B = ?; semaphore C = ?; the buffer, initialized as an empty fifo queue code for producers: while (true) { produce (); wait (A); wait (C); putiteminbuffer (); signal (C); signal (B); code for consumers: while (true) { wait (B); wait (C); takeitemfrombuffer (); signal (C); signal (A); consume (); 5 initialization choices for the semaphores are listed below. Which of the 5 choices yield a correct solution? For each choice that leads to an incorrect solution, answer the following 2 questions: Can deadlock occur? Can there be errors in how items are consumed? Choice #1: A = n, B = 0, C = 0 Choice #2: A = n, B = 0, C =1 Choice #3: A = 0, B = n, C = 1 Choice #4: A = 0, B = 0, C= 1 Choice #5: A = n, B = 0, C= 2 Please write the explanation for each choice one by one. Thanks.
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