[swift-corelibs-dev] libdispatch prep for integration to the rest of swift-corelibs

[Chris Bailey]

I believe another task for the list of libdispatch integration items is 
the implementation of the Dispatch overlay for Linux. I've been taking a 
stab at that based on changes made (and then reverted) by Slava in 
November - hopefully I'll have something worth looking at for it tomorrow.




From:   Pierre Habouzit via swift-corelibs-dev 
<swift-corelibs-dev at swift.org>
To:     Philippe Hausler <phausler at apple.com>
Cc:     Swift Core Libs <swift-corelibs-dev at swift.org>
Date:   13/01/2016 20:04
Subject:        Re: [swift-corelibs-dev] libdispatch prep for integration 
to the rest of swift-corelibs
Sent by:        swift-corelibs-dev-bounces at swift.org



it needs pthread wq changes that are still in review (the pull request is 
tagged as such).

-Pierre 

On Jan 13, 2016, at 11:11 AM, Philippe Hausler via swift-corelibs-dev <
swift-corelibs-dev at swift.org> wrote:

Splitting this off to it’s own thread since this is not per-se networking 
related

On Jan 13, 2016, at 11:07 AM, David P Grove <groved at us.ibm.com> wrote:

phausler at apple.com wrote on 01/13/2016 01:43:17 PM:
> 
> Getting GCD up and rolling is definitely a bottleneck for a few 
> things (not just NSURLSession). 

Thanks Philippe!  I was looking for things to do :)
 
> 
> 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

I can take a look at Ubuntu 14.  I know that one of the issues was the old 
version of libpthread_workqueue (under discussion for other reasons; we 
need fixes that aren't in the Ubuntu 15 version).  I'll see if there is 
anything else standing in the way for Ubuntu 14. 

I am getting a build failure on 14:

/bin/bash ../libtool  --tag=CC   --mode=compile clang -DHAVE_CONFIG_H -I. 
-I../config  -I.. -I.. -I../private -I../os -DDISPATCH_USE_DTRACE=0 -Wall 
-fvisibility=hidden -momit-leaf-frame-pointer  -I/usr/include/kqueue 
-isystem /usr/include/bsd -DLIBBSD_OVERLAY   -fblocks -g -O2 -c -o 
queue.lo queue.c
libtool: compile:  clang -DHAVE_CONFIG_H -I. -I../config -I.. -I.. 
-I../private -I../os -DDISPATCH_USE_DTRACE=0 -Wall -fvisibility=hidden 
-momit-leaf-frame-pointer -I/usr/include/kqueue -isystem /usr/include/bsd 
-DLIBBSD_OVERLAY -fblocks -g -O2 -c queue.c  -fPIC -DPIC -o .libs/queue.o
queue.c:216:22: error: use of undeclared identifier 'WORKQ_BG_PRIOQUEUE'
                .dgq_wq_priority = WORKQ_BG_PRIOQUEUE,
                                   ^
queue.c:227:22: error: use of undeclared identifier 'WORKQ_BG_PRIOQUEUE'
                .dgq_wq_priority = WORKQ_BG_PRIOQUEUE,
                                   ^
queue.c:928:18: error: invalid application of 'sizeof' to an incomplete 
type 'struct dispatch_root_queue_context_s []'


> 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)
> 

--dave



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