Review Request 121134: make KGlobal reference counting threadsafe

René J.V. Bertin rjvbertin-Re5JQEeQqe8AvxtiuMwx3w at
Sun Nov 16 20:22:25 GMT 2014

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(Updated Nov. 16, 2014, 8:22 p.m.)

Review request for KDE Software on Mac OS X, kdelibs and David Faure.

Repository: kdelibs


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.

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.

Diffs (updated)

  kdecore/kernel/kglobal.cpp cf003a4 



On OS X 10.6.8 only for now.

NB: Qt itself uses the QAtomicInt's parent class (QBasicAtomicInt) for its own reference counter used for implicit sharing. This is thus well-tested code that is unlikely to introduce regressions to a core KDE feature.


René J.V. Bertin

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