I've been (incorrectly it seems) assuming that `Continuation.invokeOnCancellation` will be invoked a...

# coroutines

[eygraber]

I've been (incorrectly it seems) assuming that Continuation.invokeOnCancellation will be invoked after resuming, and I've been relying on it for internal cleanup. Is there any way to register a callback for when a continuation resumes, or do I need to handle it manually at all the resume points?

[octylFractal]

do you not make the resume call yourself?

[streetsofboston]

Yup, either right before/after every call to cont.resume(…) or after the suspendCancellableCoroutine { … } itself.

[eygraber]

I guess I have a lot of fixing to do 🙂

[octylFractal]

I would do it before the call to cont.resume, as undispatched continuations will prevent your code from continuing to run, but that may not be possible in some cases

[streetsofboston]

The resume function does not return a `Nothing`…. code that is after a call to resume should be executed, shouldn’t it?

[octylFractal]

yes, but not until it is either re-dispatched or completes

[streetsofboston]

I see… yup, safer bet would be to call it before 🙂

[octylFractal]

though tbh, if you're in a kotlinx.coroutines context (i.e. using Job), most coroutines will be re-dispatching to Default or similar, so it may not be a huge deal