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Conditions satisfied by the logical clocks

· Clock condition: if aàb,

· then C(a) < C(b)

o If event a happens before event b, then the clock value (timestamp) of a should be less than the clock value of b

o Note that we can not say: if C(a)

· Correctness conditions (must be satisfied by the logical clocks to meet the clock condition above):

[C1] For any two events a and b in the same process Pi, if a happens before b, then Ci (a) < Ci (b)

[C2] If event a is the event of sending a message m in process Pi , and event b is the event of receiving that same message m in a different process Pk, then Ci (a) < Ck (b)

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