[swift-corelibs-dev] NSURLSession & CFNetwork

Philippe Hausler phausler at apple.com
Wed Jan 13 12:43:17 CST 2016

Getting GCD up and rolling is definitely a bottleneck for a few things (not just NSURLSession). 

There are a few things that we need as checkpoints:
A set of build instructions tailored for the swift project
GCD needs to be able to build on Ubuntu 14 as well as Ubuntu 15
We need to move Availability.h and friends down underneath both GCD and Foundation since they both use them
We need to move the blocks runtime out of Foundation and underneath or inside of GCD.
The master build script in swift/utils/build-script needs to be able to build GCD
The master build script in swift/utils/build-script to ensure GCD and all required components are built before Foundation and the appropriate linker paths are passed to Foundation (see how XCTest is handled)

> On Jan 13, 2016, at 10:39 AM, David P Grove via swift-corelibs-dev <swift-corelibs-dev at swift.org> wrote:
> > From: Robert Stephen Thompson via swift-corelibs-dev <swift-
> > corelibs-dev at swift.org>
> > 
> > I might be wrong (I obviously don’t work for Apple or anything), but
> > when I looked at it, the main stumbling block at this point is the 
> > lack of libdispatch. I mean, all the basic network stuff could be 
> > implemented with posix APIs no problem, but basically all of what 
> > makes NSURLSession et al actually cool comes from GCD. Which does 
> > make me wonder what the status of libdispatch is now… I did try 
> > building it on Linux and it appears to now build “out of the box” 
> > (after installing some additional dependencies), but tests hang. 
> Hi,
> I'm hoping you are seeing as a hang is just an unfortunate current ordering of test cases.  For me, the tests run and 29 of 32 pass.  It is currently running dispatch_select as the first test, which is perhaps a bad choice.  The sub test "kevent read 1" of dispatch_select takes about 90 seconds with no output for me, so the test may appear to be hanging.  Be patient ;)
> > How
> > will we go about integrating it with the corelibs-foundation project
> > once it’s ready to try doing that?
> >
> This is a great question (but for someone who knows more about corelibs-foundation than me....).  I think libdispatch on Linux is getting close to being ready for this next step.  
> --dave
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