Support cancellation in AsyncBarrier

[chenzhekl]

Is your feature request related to a problem? Please describe.

I want to have AsyncBarrier to support cancellation in SignalAndAwait, such that I can free those async functions from awaiting the barrier to finish.

Describe the solution you'd like

Maybe we can have SignalAndAwait accept an CancellationToken as its argument.

Describe alternatives you've considered

None

Additional context

None

[AArnott]

I'm not sure whether we'll deliver this yet. But in the meantime you can tack on .WithCancellation(ct) on the SignalAndWait call to achieve the same effect that we would probably deliver.

[chenzhekl]

Thanks! @AArnott . .WithCancellation(ct) works perfect for me as a workaround.