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Is there any way to suspend until some predicate is met, other than like a while loop?

By what mechanism does the value of the predicate change? Is there some callback or other notification? There are lots of integrations with existing reactive libraries. (also see the <#C1CFAFJSK|> channel)

Oops I missed that channel; the predicate is being changed by events recieved from the ktor websocket

What i meant was, how can you tell that the predicate’s value will have changed? Is there a callback or some other reactive signal, or do you have to poll the value?

Then yea, use a while loop. But also make sure to yield, which both ensures you participate in cooperative cancellation and allows other coroutines to run.