4. Synchronization (2).pdf
4. Synchronization (2).pdf
4. Synchronization (2).pdf
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Mutual Exclusion:<br />
A Centralized Algorithm<br />
• Mutually exclusive access<br />
– Coordinator only lets one process in<br />
• Deadlock freedom<br />
– If no process is in critical region, any other<br />
that wants to can be granted<br />
• Starvation freedom<br />
• Fairness<br />
– Access granted in order of receipt at<br />
coordinator<br />
• Only 3 messages per ressource use<br />
– But coordinator is single point of failure and<br />
potential bottleneck<br />
Tanenbaum & Van Steen, Distributed Systems: Principles and Paradigms, 2e, (c) 2007 Prentice-Hall, Inc. All rights reserved. 0-13-239227-5
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