[tlaplus] Weak fairness until a majority

[Jack Vanlightly <vanlightly@xxxxxxxxx>]

Hi all,

Let's say that I have an ensemble of nodes and each node has a counter. I have the action Increment which increments the counter of a node, if the value is 0.

Increment == 

    \E n \in Nodes : 

        /\ counter[n] = 0

        /\ counter' = [counter EXCEPT ![n] = @ + 1]

I would like to express weak fairness of Increment, but only while a minority of nodes have incremented their counter. So once a majority have incremented their counter, the weak fairness no longer applies.

Is there a way of defining weak fairness in this way?

Thanks

Jack Vanlightly

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