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In Ricart-Agrawal's mutual exclusion algorithm, when a process finishes its CS (critical section) execution, it sends a Reply message to all queued processes. Consider
In Ricart-Agrawal's mutual exclusion algorithm, when a process finishes its CS (critical section) execution, it sends a "Reply" message to all queued processes. Consider the following figure, where P4 sends Reply to P1, P2, and P3. P2 P1 Reply Reply P4 P1 P2 P3 Reply P3 Queue (a) If multiple processes receive "Reply", can more than one processes potentially enter CS, violating the safety condition? (b) What can potentially go wrong if the P4 sends Reply only to the top process in the queue, say to P1?
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Computer Networking A Top-Down Approach
Authors: James F. Kurose, Keith W. Ross
5th edition
136079679, 978-0136079675
