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August 2012

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MountainLion libdispatch sources pushed to macosforge repo
by Daniel A. Steffen 19 Dec '12

19 Dec '12

I've committed the MountainLion libdispatch source drop from opensource.apple.com to trunk of the macosforge repository. The autotools buildsystem & testsuite have also been updated, c.f. INSTALL for the additional dependencies on OS X (not required on other platforms). 'make check' passes all tests on MountainLion, and the library built per INSTALL via the autotools buildsystem can be used to replace the system library. Looking forward to contributions of portability fixes for other platforms! Daniel commit 16c9bb430e971b484fd2c80cbb573aa3644e6fb1 Author: dsteffen(a)apple.com <dsteffen@apple.com@5710d607-3af0-45f8-8f96-4508d4f60227> Date: Thu Aug 9 05:09:03 2012 +0000 MountainLion macosforge testsuite git-svn-id: http://svn.macosforge.org/repository/libdispatch/trunk@215 5710d607-3af0-45f8-8f96-4508d4f60227 25 files changed, 1440 insertions(+), 149 deletions(-) commit 415e764f7de27656c266e3659d1fe428152c646b Author: dsteffen(a)apple.com <dsteffen@apple.com@5710d607-3af0-45f8-8f96-4508d4f60227> Date: Thu Aug 9 05:08:56 2012 +0000 autotools buildsystem and portability changes for MountainLion source git-svn-id: http://svn.macosforge.org/repository/libdispatch/trunk@214 5710d607-3af0-45f8-8f96-4508d4f60227 11 files changed, 112 insertions(+), 34 deletions(-) commit a27eef27f38b7cd2c3ffe628f2b0eb270279db26 Author: dsteffen(a)apple.com <dsteffen@apple.com@5710d607-3af0-45f8-8f96-4508d4f60227> Date: Thu Aug 9 05:08:50 2012 +0000 <rdar://problem/11754320> git-svn-id: http://svn.macosforge.org/repository/libdispatch/trunk@213 5710d607-3af0-45f8-8f96-4508d4f60227 1 file changed, 8 insertions(+), 6 deletions(-) commit 048e34b21a87719866e5c998bfef4b39bee27af9 Author: dsteffen(a)apple.com <dsteffen@apple.com@5710d607-3af0-45f8-8f96-4508d4f60227> Date: Thu Aug 9 05:08:47 2012 +0000 import MountainLion libdispatch-228.18 source drop git-svn-id: http://svn.macosforge.org/repository/libdispatch/trunk@212 5710d607-3af0-45f8-8f96-4508d4f60227 59 files changed, 3922 insertions(+), 1048 deletions(-) commit 256c038abd7e2d6b50f5bb417bb77f4f67d610cd Merge: adf9b1f fd874f5 Author: dsteffen(a)apple.com <dsteffen@apple.com@5710d607-3af0-45f8-8f96-4508d4f60227> Date: Wed Aug 1 21:00:35 2012 +0000 merge Lion branch to trunk git-svn-id: http://svn.macosforge.org/repository/libdispatch/trunk@211 5710d607-3af0-45f8-8f96-4508d4f60227

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dispatch_suspend() does not affect child queues
by Michael Roitzsch 06 Aug '12

06 Aug '12

Hi libdispatch team, I have a question regarding the indented behavior and use of dispatch multiple queues: If a queue A has its target set to queue B and queue B is suspended with dispatch_suspend(B), why are blocks from queue A still executed? I was expecting dispatch_suspend(X) to silence the entire subsystem of queues directly or indirectly targeting queue X, but it does not. Instead, only the queue X I pass in is suspended, all other queues seem unaffected. I attached an Xcode project (tested on OS X 10.8.0) to demonstrate the issue. I am using two serial queues "low" and "high" to implement the front enqueue pattern to execute emergency work: The "low" queue targets the "high" queue. Blocks are usually enqueued on "low", emergency work is enqueued on "high" so it can bypass all the work queued in "low". This works fine when line 27 is commented out. However, as soon as I give a different subsystem of my code (imagine this being a third party library) access to the "low" queue, this subsystem can create a hidden private queue that feeds into "low". The emergency block will now experience undue delay, because suspending the "low" queue does not suspend the private queue. I would like to understand the rationale for this behavior of libdispatch. Michael

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