>java.lang.IllegalStateException: Already resumed So, `CoroutineContext`s are not reusable

# coroutines

[pakoito]

java.lang.IllegalStateException: Already resumed

So, `CoroutineContext`s are not reusable

[mkobit]

i remember seeing https://discuss.kotlinlang.org/t/first-class-coroutine-continuations/2529/5 and https://gist.github.com/elizarov/ddee47f927dda500dc493e945128d661 a while ago

[pakoito]

I don’t deny it’s a solution, but it’s clearly one that’s not prod-ready. Sad 😞

[elizarov]

Can you please elaborate what it has to do with contexts? Do you have an example code?

[pakoito]

yes! what I’m trying to write is some code that enforces every flatMap to happen on the CC that’s been passed, so it reuses it

[pakoito]

https://pastebin.com/DfPpMT1Z

[pakoito]

the problem is that the CC isn’t reusable so I cannot start a new coroutine for every step, even if I use EmptyCoroutineContext

[elizarov]

I don’t get it. CoroutineContext is an immutable state-less data structure. Your problem is with something else. What kind of error you are getting?

[pakoito]

java.lang.IllegalStateException: Already resumed

[pakoito]

If I give a new CoroutineContext every time it works just correctly

[pakoito]

the same CC is being used for multiple active corutines

[pakoito]

so it may be the stacklabels we’re copying?

[elizarov]

This is exception can be only thrown by either suspendCoroutine or suspendCancellableCoroutine and has nothing to do with the context. It happens when you try to resume the same Continuation twice

[elizarov]

context, by itself, has no state

[pakoito]

hmmmm

[pakoito]

that’s good info

[pakoito]

I can come back to the code with that, thanks 😄