Review Request 125217: KDirWatch: fix thread safety

[Albert Astals Cid]

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+1 i can confirm that the threaded kservice tests are more stable.

- Albert Astals Cid


On set. 13, 2015, 8:18 p.m., David Faure wrote:
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> https://git.reviewboard.kde.org/r/125217/
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> (Updated set. 13, 2015, 8:18 p.m.)
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> Review request for KDE Frameworks, Albert Astals Cid and Michael Pyne.
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> Repository: kcoreaddons
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> Description
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> The use of KDirWatch from KSycoca exposed that KDirWatch was really not
> thread-safe. The internal singleton design brings a ton of races between
> KDirWatch instances. Easy solution: one "singleton" per thread, using
> QThreadStorage.
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> The main impact is on memory management; the "singleton" is no longer refcounted
> but simply deleted at the end of the thread, by QThreadStorage (including for
> the main thread). Since this happens at ~QApp time, we need to zero the d pointer
> of KDirWatch::self(), which is deleted by a global-static dtor later on.
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> Diffs
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>   src/lib/io/kdirwatch.h f1593e73898c3610c2a560714ed608367120afa8 
>   src/lib/io/kdirwatch.cpp 5e015c10cb99dbe4a21f944d4c0d0b364f2a7263 
>   src/lib/io/kdirwatch_p.h b2ac9d419bb0b0939a4eaa235a55634482db1cc6 
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> Diff: https://git.reviewboard.kde.org/r/125217/diff/
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> Testing
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> unittests in kcoreaddons still pass, but now kservice's ksycocathreadtest passes every time, unlike before.
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> Thanks,
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> David Faure
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