[Webkit-unassigned] [Bug 79785] [Qt] WebKit with Qt5 hangs on Mac

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=79785





--- Comment #5 from Zeno Albisser <zeno at webkit.org>  2012-04-12 07:13:36 PST ---
Actually this issue is not really fixed in Qt.
It is a race condition in local static initialization.

Compilers on mac actually put a cxa_guard around local static initializers, unless the created type is POD.
It seems that for these cxa_guards there is only one mutex for all local statics being used process wide, instead of one mutex per definition.
This means that whenever one thread is waiting in a static initialization, for another thread to initialize another local static variable, this will lead to a deadlock.
Unfortunately such local static initializers are used in Q_GLOBAL_STATIC macro which is used frequently in Qt.
I filed a bug report about this to apple. - I hope we will see this fixed in the compiler soon.

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