Also known an Ricart and Agrawala’s algorithm. • Nodes use logical clocks: all events are in total order. • When a node wants to enter a CS (Critical Section) it sends a message. • The message contains following information 1. Process id of the process 2. The name of CS that the process wants to enter 3. A unique timestamp generated by the process for request msg • When a node receives such a request 1. If it is not interested in this CS, it replies OK immediately. 2. If it is interested in this CS: If its message’s timestamp was older, then replies OK, Else, it puts the sender in a queue and doesn’t reply anything (yet) 3. If it is already in the CS, it puts the sender in a queue and doesn’t reply anything (yet). • A node enters the CS when it received OK from all other nodes. • A node that exits the CS, sends immediately OK to all nodes that it may have placed in the queue.

RICARTA-AGRAWALA ALGORITHM.cpp

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