Review Request 118614: Make KIO thread-safe

[David Faure]

> On June 8, 2014, 1:20 p.m., Thiago Macieira wrote:
> > QDBusConnection is supposed to be threadsafe.

It's definitely not... https://bugreports.qt-project.org/browse/QTBUG-39528


- David


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On June 8, 2014, 10:11 a.m., David Faure wrote:
> 
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> This is an automatically generated e-mail. To reply, visit:
> https://git.reviewboard.kde.org/r/118614/
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> 
> (Updated June 8, 2014, 10:11 a.m.)
> 
> 
> Review request for KDE Frameworks, Aleix Pol Gonzalez and Thiago Macieira.
> 
> 
> Repository: kio
> 
> 
> Description
> -------
> 
> Unittest for kiocore's thread-safety
> 
> 
> KIO thread safety: use one DBus connection per thread
> 
> 
> KIO thread safety: don't use static buffers.
> 
> They obviously lead to data races between threads.
> 
> KIO: create one instance of Scheduler per thread.
> 
> 
> Diffs
> -----
> 
>   src/core/scheduler.cpp e762e369b8d74971831dc1e9f4d083bfd77b8e30 
>   src/core/connectionbackend.cpp 532141af5ab7676d1287379e56ff48bd7fa10c37 
>   autotests/threadtest.cpp PRE-CREATION 
>   autotests/CMakeLists.txt 81d261b8620e0a0512a5bc021ed189e910c0922a 
> 
> Diff: https://git.reviewboard.kde.org/r/118614/diff/
> 
> 
> Testing
> -------
> 
> helgrind'ing the unittest.
> 
> 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
> 
> Also reported QTBUG-39528 (QDBusConnection::sessionBus race)  (but we have KDBusConnectionPool for that)
> 
> And there are still more races in Qt: 
> QMutex::isRecursive, qdbus_loadLibDBus, QDBusConnectionPrivate::connectSignal, qt_message_print....
> 
> And a few in our code:
> the getenv(KDE_FORK_SLAVES) in KIO, and the dbus interface for klauncher in KDEInitInterface::ensureKdeinitRunning.
> 
> 
> Thanks,
> 
> David Faure
> 
>

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