Review Request 121134: make KGlobal reference counting threadsafe

[Thomas Lübking]

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https://git.reviewboard.kde.org/r/121134/#review70444
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Do you have a backtrace of the condition?
If there's trouble w/ ONE client onnly, i'd rather bet on a client bug (and KGlobal doesn't mention thread-safetyness)

What you probably can do (as it's reproducible "somehow") is to add a QMutex.
::tryLock() before and ::unlock() after altering the value.
If ::tryLock() ever returns "false" you can abort(); (or just yell a warning ;-) and got your confirmation

- Thomas Lübking


On Nov. 16, 2014, 3:53 nachm., René J.V. Bertin wrote:
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> This is an automatically generated e-mail. To reply, visit:
> https://git.reviewboard.kde.org/r/121134/
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> (Updated Nov. 16, 2014, 3:53 nachm.)
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> Review request for KDE Software on Mac OS X and kdelibs.
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> Repository: kdelibs
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> Description
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> I have been experiencing unexpected exits from KDevelop that were not due to any kind of error in the KDevelop code; it was as if someone told the application to exit normally. This happens mostly on OS X, but also sometimes on Linux.
> I finally traced this to `KGlobal::deref` reaching a zero reference count and invoking `QCoreApplication::quit` when called from one of KDevelop's KJob dtors. There does not appear to be a reference counting mismatch in the code, so the issue might be due to a race condition in KGlobal::ref/deref.
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> This patch introduces thread-safety to KGlobal's reference counting by turning the simple global `static int s_refCount` into a `static QAtomicInt s_refCount`. I consider this an important bug fix regardless of whether it corrects the issue I have with KDevelop.
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> Diffs
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>   kdecore/kernel/kglobal.cpp cf003a4 
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> Diff: https://git.reviewboard.kde.org/r/121134/diff/
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> Testing
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> On OS X 10.6.8 only for now.
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> Thanks,
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> René J.V. Bertin
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