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Lamport Algorithm Assignment Help


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What is Lamport algorithm?


1) Every process increase local clock between any two consecutive events 

2) We want a means associated with calculating time so that for each event ‘a’, we are able to allocate this a time value ‘C(a)’ which just about all procedures acknowledge these:

     - Any time clock  ‘C’ should monotonically  improve i.e, constantly go forward.

     - If (a) --> (b) then C(a) < C(b)

3) Every development, ‘p’, preserves a local counter ‘Cp’

4) ‘Cp’ is increased before every incident has issued at route p: Cp = (Cp + 1)

5) When ‘p’ sends a message ‘m’, it piggybacks on ‘m’ the value ‘t’ = (Cp)

6) On receiving (m, t), process q computes cq = max(cq, t) and then applies the first rule before timestamping the event rcv(m)


Pseudocode for lamport's algorithm


send event():- identifies the sending of an event
receive event():- identifies the receiving of an event
eventOccurred():- signifies that an event has occurred
main():-create methods and calls send and receive events on the processes.


Example:

Suppose that every process's logical clock is set to 0.


From the timing diagram, what can you say about the following events?

Between ( a and b ): a --> b
Between ( b and f ): b --> f
Between  ( e and k ): concurrent
Between ( c and h ): concurrent
Between ( k and h ): k --> h


1) A timestamp of 1 is associated with events a, e, j in processes S1, S2, S3 respectively.

2) A timestamp of 2 is associated with events b, k in processes S1, S3 respectively

3) The times may be the same but the events are distinct.

4) We would like to create a total order of all events i.e for an event a, b we would like to say that either (a --> b) or (b --> a)

5) Create total order by attaching a process number to an event.

6) Pi timestamps event ‘e’ with Ci( e ).i

7) we then say that ci( a ). i happens before ‘cj( b ).j’ if ‘f’:

8) ci( a ) < cj( b ); or ci( a ) = cj( b ) and i < j


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