How to cancel CoroutineScope and await/join all its jobs?

# coroutines

[Marko Mitic]

How to cancel CoroutineScope and await/join all its jobs?

[louiscad]

Launch them in a coroutineScope { … }. Simply.

[louiscad]

Big thanks to the folks involved in structured concurrency.

[Marko Mitic]

Any way to do it for an existing scope?

[Zach Klippenstein (he/him) [MOD]]

https://kotlin.github.io/kotlinx.coroutines/kotlinx-coroutines-core/kotlinx.coroutines/cancel-and-join.html

[louiscad]

Yes, but why? Structured concurrency does it for free, you just have to delimit the local scope as I shown.

[Marko Mitic]

I'm using structured concurrency to start several coroutines to handle my VPN queues

[Marko Mitic]

so those are indefinite until user stops the VPN and then I need to cancel those

[Marko Mitic]

I guess I'd need additional thread to utilize coroutineScope { … } for that and to refactor my scope

[louiscad]

coroutineScope itself doesn't need an extra thread.

[Marko Mitic]

I've looked it up, yes it wouldn't need a thread

[Marko Mitic]

but I already have coroutines started in another scope

[Marko Mitic]

I fixed my issue in another way, so this isn't big issue for me

[Marko Mitic]

but I'm still interested whether there is some utility method to get scope's active jobs or to cancel existing scope and wait on it's jobs to finish

[louiscad]

You can sort-of nest scopes with coroutineScope and they will wait for child coroutines and scopes