Lamport’s algorithm for mutual exclusion

Jul 12, 2011Download as PPT, PDF11 likes20,173 views

Neelamani Samal

The slide deals with the basic working principle of Lamport's algorithm.It explains the details with example

What is Lamport’s Algorithm It is a computer algorithm Intended to improve the safety in the usage of shared resources Using mutual exclusion.

Related Terms Mutual exclusion Types of mutual exclusion algorithm Critical Section(C.S.) Logical Clock Causal Ordering Of Messages

Algorithm Every site Si keeps a request_queuei, contains mutual exclusion requests ordered by their timestamps messages to be delivered in the FIFO order between every pair of sites

System Models Requesting The C.S. Executing The C.S. Releasing The C.S. `

Example We have S1,S2,S3 as sites S1,S2 request for CS S2 Being first

(2,1) S1 S2 S3 (1,2) S1,S2 making requesr for entering CS

(1,2),(2,1) S1 S2 S3 (1,2) (2,1) Site S2 enters CS (1,2) (1,2),(2,1) (1,2),(2,1) S2 enters CS

S1 S2 S3 (1,2) (2,1) Site S2 exitsCS and release message (1,2) (1,2),(2,1) (1,2),(2,1) (1,2),(2,1) S2 exits CS

(2,1) S1 S2 S3 (1,2) (2,1) Site S1 entersCS (1,2) (1,2),(2,1) (1,2),(2,1) (1,2),(2,1) S1enters CS (2,1)

Performance Analysis Total No. of REQUEST (N-1) Total No. Of REPLY (N-1) Total No. Of RELEASE (N-1) Total = 3(N-1)

Conclusion Though it does not explain the Modern scenario of distributed systems but , it gave the basic of developing the present way of handling distributed resources.

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