Review Request 121817: Fix for crash which was introduced by RR 121480 (use QCollator instead of KStringHandler)

[Frank Reininghaus]

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Ship it!


This looks like it should fix the crash indeed, thanks!

Something that we might want to keep in mind is to check if there is now more collator-copying than needed. At first sight, it looks like a copy of the collator will be created not only when a new thread is forked, but every time a recursive call is made in kfileitemmodelsortalgorithm.h, right? I'm not sure how expensive creating a new collator is, but it might be worth investigating that (but after this commit is pushed - better fix this crash first and then look at the performance later).

- Frank Reininghaus


On Jan. 3, 2015, 10:22 nachm., Emmanuel Pescosta wrote:
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> https://git.reviewboard.kde.org/r/121817/
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> (Updated Jan. 3, 2015, 10:22 nachm.)
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> Review request for Dolphin.
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> Bugs: 342316
>     http://bugs.kde.org/show_bug.cgi?id=342316
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> Repository: kde-baseapps
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> Description
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> While porting away from KStringHandler::naturalCompare to QCollator::compare, I had thought that QCollator is an drop-in replacement for KStringHanlder (also regarding to thread safety) - but according to the docs it's reentrant only (sry I missed that), surprisingly sorting with multiple threads never crashed here.
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> To fix the issue, we create a new thread local QCollator instance for every thread.
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> Diffs
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>   dolphin/src/kitemviews/kfileitemmodel.h df7a5e3 
>   dolphin/src/kitemviews/kfileitemmodel.cpp 1c92a2c 
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> Diff: https://git.reviewboard.kde.org/r/121817/diff/
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> Testing
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> Kai and Lane tested this patch and they confirmed that the patch fixes the crash for them.
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> Thanks,
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> Emmanuel Pescosta
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