I get hit by XLib errors every so often... They seem to occur during track
loads and they lock up the UI thread.
Decided to take a poke around in the code after looking at this post:
http://lists.trolltech.com/qt-interest/2005-05/msg00702.html
Here's what I found:
Around line #155 of wavesummary.cpp we call:
pTrackInfoObject->setWaveSummary(pData, 0);
If I comment out this line, I can load tracks very aggressively and I don't
get XLib errors. (of course, I don't get wave summarys either)
setWaveSummary is defined here:
851 void TrackInfoObject::setWaveSummary(Q3MemArray<char> * pWave,
Q3ValueList<long> * pSegmentation)
852 {
853 m_qMutex.lock();
854 m_pWave = pWave;
855 m_pSegmentation = pSegmentation;
856 m_qMutex.unlock();
857
858 setOverviewWidget(m_pOverviewWidget);
859 }
It calls
875 void TrackInfoObject::setOverviewWidget(WOverview * p)
876 {
877 m_pOverviewWidget = p;
878
879 if (m_pOverviewWidget)
880 p->setData(getWaveSummary(), getSegmentationSummary(),
getDuration()*getSampleRate()*getChannels());
881 }
That calls:
99 void WOverview::setData(Q3MemArray<char> * pWaveformSummary,
Q3ValueList<long> * pSegmentation, long liSampleDuration)
100 {
101 m_pWaveformSummary = pWaveformSummary;
102 m_pSegmentation = pSegmentation;
103 m_liSampleDuration = liSampleDuration;
104
105 repaint();
106 }
So to me it looks like the wave summary thread is making a call to paint the
widget directly, something the mailing list post suggests is a bad idea to
do outside the main UI thread...
Now, I have to read a bit more about sending QEvents around...
--
__
--- == __/ t.O ==--
http://stacktrace.org/
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