On Wed, Jul 19, 2017 at 2:37 AM, Pau Freixes <pfrei...@gmail.com> wrote:

> Not at all, the idea is taking into advantage the Event principle,
> having a set of Futures waiting to be awakened and returning either a
> value or exception.


That's not the principle of Event. You are describing a Future.

Regarding the propagation of the cancellation if and only if *all*
> callers are canceled IMHO will fall on the side of a complex problem,
> and the solution might be do nothing.


If you're willing to do nothing when all callers cancel, then the Future
solution that Nathaniel posted should work for you (replacing
ensure_future() with shield()).

Have you tried it? Do you have a specific objection to it?
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