[swift-corelibs-dev] Asynchronous Operations

Matthew Johnson matthew at anandabits.com
Fri Jan 20 10:01:38 CST 2017

> On Jan 20, 2017, at 9:55 AM, Ian Partridge via swift-corelibs-dev <swift-corelibs-dev at swift.org> wrote:
> On Darwin, asynchronous usage of Operation is supported via KVO notifications.
> Because KVO is only available on Darwin platforms, swift-corelibs-foundation currently does not support asychronous Operations, and there is a comment to that effect:
> https://github.com/apple/swift-corelibs-foundation/blob/6c2afef20330681ec1f8e4e4e3e2664bfd758888/Foundation/NSOperation.swift#L50 <https://github.com/apple/swift-corelibs-foundation/blob/6c2afef20330681ec1f8e4e4e3e2664bfd758888/Foundation/NSOperation.swift#L50>
> My understanding is that it's unlikely KVO will arrive on Linux any time soon, so this leaves us with a problem in Operation.  Asynchronous usage of Operation is an important feature.
> Is there any way that we could support asynchronous operations in swift-corelibs-foundation, in the absence of KVO?
> Might it be acceptable to add extra temporary public API to enable this?

+ 1.  IMO eliminating the dependence of an API like this on KVO would be a good thing regardless of whether KVO is present or not.

> Many thanks,
> -- 
> Ian Partridge
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