A modern programming language that makes developers happier.

kotlinlang

Call for feedback/input

I want to introduce an `await` construct to Kovenant, but this is actually really tricky. The expected behaviour of an `await` call in most languages is not to block but to let the calling thread do other work and continue later. Otherwise we just could make a call to `get()` (which does block). Furthermore, blocking shouldn’t be done inside a `async` block since you can create a deadlock situation that way.

So this is what we want:
```
async {
    val a1 = await(p1)
    val a2 = await(p2(a1))
    //...etc
}
```
The tricky part is the implementation of `await` itself. It should give control back to the Dispatcher. The easiest way is to introduce a method on Dispatchers to help along and do one task from the queue. But not all dispatchers can be made to help along. If you create a Dispatcher from e.g. an Executor you won’t always be able to provide such method. I think in that case await should throw some Unsupported Operation Exception. But that is not really user friendly. What do you think?