Ricart–Agrawala algorithm Ricart-Agrawala algorithm is an algorithm for mutual exclusion on a distributed system . This algorithm is an extension and optimization of Lamport's Distributed Mutual Exclusion Algorithm , by removing the need for messages. It was developed by Glenn Ricart and Ashok Agrawala .Terminology A site is any computing device which runs the Ricart-Agrawala Algorithm The requesting site is the site which is requesting to enter the critical section . The receiving siteAlgorithm Requesting Site Receiving Site Upon reception of a request message, immediately sending a timestamped reply message if and only if: Otherwise , the receiving process will defer the reply message. This means that a reply will be sent only after the receiving process has finished using the critical section itself. Critical Section: Requesting site enters its critical section only after receiving all reply messages. Upon exiting the critical section, the site sends all deferred reply messages.Performance Max number of network messages; 2* Synchronization Delays: One message propagation delay Common optimizations attempts up to the moment when has sent a message to. This is called Roucairol-Carvalho optimization or Roucairol-Carvalho algorithm.Problems One of the problems in this algorithm is failure of a node. In such a situation a process may starve forever.problem can be solved by detecting failure of nodes after some timeout.
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