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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.
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