Make `CancellationWaiter` public

[adam-fowler]

I've implemented a version (I forgot to add cancellation support as well as graceful shutdown), I know other people have done the same as well. Should we be just using the one that is already written here

[ktoso]

Sounds like a good idea, though it should be renamed probably since it also waits for graceful shutdown?

Also, worth lifting such type into concurrency library perhaps?

[adam-fowler]

Also, worth lifting such type into concurrency library perhaps?

You'd have to lift the whole graceful shutdown system into the Concurrency library then (which isn't necessarily a bad thing).

[ktoso]

I meant a form of this without the graceful shutdown, "wait for cancellation" minor trick but might be nice to lift eventually. I often feel we're missing small convenient things like that

[adam-fowler]

@FranzBusch ?

[FranzBusch]

This is actually already publicly exposed. Just use try await gracefulShutdown() which will wait for either cancellation or graceful shutdown. In case of cancellation you will get a CancellationError thrown.