Joe:
FYI, if you want to be able to use the Swift 2.2 APIs for Dispatch,
there's some instructions on how to build a toolchain with Dispatch
included here:
https://gist.github.com/seabaylea/cad7808615c52cfd2fc9d1debcad832f
The third step uses a fork of Foundation from (based on master from a
couple of weeks ago) that enables the use of Dispatch by Foundation
itself, and adds NSURLSession support. If you just want to use Dispatch
directly, you can ignore that step.
As Dave says, we're working on adding Dispatch into the toolchain on
Linux, and uplifting it to the new Swift 3.0 APIs - if you want to get
involved, your definitely welcome!
Chris
From: David P Grove via swift-corelibs-dev
<swift-corelibs-dev@swift.org>
To: swift-corelibs-dev@swift.org
Date: 21/06/2016 14:02
Subject: Re: [swift-corelibs-dev] libdispatch/GCD for Swift 3.0 on
Linux
Sent by: swift-corelibs-dev-boun...@swift.org
Hi Joe,
TL;DR: right now the Swift 3.0 overlay for libdispatch is not available on
Linux.
But, a variety of activities are kicking off to get it there. There
should be visible progress (and opportunities to help if you are so
inclined) over the next few weeks.
>
> While working to convert some NSThread code over to GCD on Linux I
> noticed that (to my dismay) GCD wasn't included in the Swift 3.0
> preview build, nor is it apart of the buildbot for Linux. Scouring
> through the repository and mailing lists I can see where it is
> possible to build, but there are no downstream instructions on how
> to make a line like this:
>
> let queue = DispatchQueue(label: "com.app.queue")
>
> work with the swiftc compiler on Linux.
>
> A couple of questions:
>
> * are there any timelines that the principals of GCD with Swift 3 on
> Linux can share; i.e., is the plan to have it included in time for
> the Swift 3 GA release later this year?
I certainly hope so; but cannot speak for official plans.
> * are there any follow-up instructions past getting it built on how
> to use it (or will make install DESTDIR place it in the right spots
> in the Swift 3 toolchain hierarchy?)
>
I expect when things are done, it will be similar to how building the
current Swift-2 dispatch overlay works on Linux. To build from source you
use swift/utils/build-script with --libdispatch and it takes care of all
the details (ie, it just works...).
--dave
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