+system allow parking() when clustering

[ktoso]

Motivation:

It is not clear to users how to "keep the main() alive while the system is not terminated".

We have park() for that, but it was not fully doing that.

Goal, avoid people writing "sleep for 10 minutes" in example apps etc:

            try! self.client.run(for: .minutes(10)) // FIXME: How can I make this run indefinitely?

Modifications:

• Make park do what people would expect.
• I'd like to eventually revisit the park design, but for now this is better

[yim-lee]

TIL 👍

[erik-apple]

Thanks for this!

[ktoso]

Hope this helps :-)

It was always the intent, but never quite finished. Even with this some work remaining here but we'll get there :)