Review Request 118614: Make KIO thread-safe

[Thiago Macieira]

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Since there was no problem in QtDBus after all, this patch can be reverted.

- Thiago Macieira


On June 14, 2014, 4:59 p.m., David Faure wrote:
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> (Updated June 14, 2014, 4:59 p.m.)
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> Review request for KDE Frameworks, Aleix Pol Gonzalez and Thiago Macieira.
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> Repository: kio
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> Description
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> Unittest for kiocore's thread-safety
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> KIO thread safety: use one DBus connection per thread
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> KIO thread safety: don't use static buffers.
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> They obviously lead to data races between threads.
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> KIO: create one instance of Scheduler per thread.
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> Diffs
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>   src/core/scheduler.cpp e762e369b8d74971831dc1e9f4d083bfd77b8e30 
>   src/core/connectionbackend.cpp 532141af5ab7676d1287379e56ff48bd7fa10c37 
>   autotests/threadtest.cpp PRE-CREATION 
>   autotests/CMakeLists.txt 81d261b8620e0a0512a5bc021ed189e910c0922a 
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> Diff: https://git.reviewboard.kde.org/r/118614/diff/
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> Testing
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> helgrind'ing the unittest.
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> I found and fixed many races within Qt by doing that...
> Race on QMutex::id --> https://codereview.qt-project.org/86237
> Race in QThreadStorage --> https://codereview.qt-project.org/87047
> Race in QLoggingCategory --> https://codereview.qt-project.org/87054
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> Also reported QTBUG-39528 (QDBusConnection::sessionBus race)  (but we have KDBusConnectionPool for that)
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> And there are still more races in Qt: 
> QMutex::isRecursive, qdbus_loadLibDBus, QDBusConnectionPrivate::connectSignal, qt_message_print....
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> And a few in our code:
> the getenv(KDE_FORK_SLAVES) in KIO, and the dbus interface for klauncher in KDEInitInterface::ensureKdeinitRunning.
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> Thanks,
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> David Faure
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>

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