Hi, On Sat, Apr 16, 2011 at 5:45 AM, Luke Campagnola <[email protected]> wrote: > Hello, > I have a multi-threaded application that locks up periodically while drawing > graphics. The application is quite large and due to the randomness of the > lockup (usually takes between 10 minutes and 10 hours), I have not been able > to work out the exact cause. I do believe that all GUI calls are being > correctly restricted to the main thread. Below is a partial stack trace > collected while locked. Notably, the lockup occurs in the destructor for > some QObject following a QTimer single-shot signal. > The application displays live video from a camera, and as far as I can tell, > the only objects being deleted would be related to 1) signals being sent as > new camera frames arrive, 2) QTimer signals that drive the video display, > and 3) QImage/QPixmap pairs that are used to update a QGraphicsPixmapItem. > If anyone can offer clues as to what might cause this, I would be most > grateful. > Luke >
This is a long shot, I just thought I should mention it: a deadlock [1] in QMutex was fixed in qt-4.7.2 [2]. If you are using and older Qt version, the new one may be worth a try. Hope this helps, Thomas [1] http://bugreports.qt.nokia.com/browse/QTBUG-16115 [2] http://qt.nokia.com/developer/changes/changes-4.7.2/ _______________________________________________ PyQt mailing list [email protected] http://www.riverbankcomputing.com/mailman/listinfo/pyqt
