[ROOT] Multithreaded GUI, TRootEmbeddedCanvas

From: Thomas Bretz (tbretz@uni-sw.gwdg.de)
Date: Mon Aug 20 2001 - 10:27:41 MEST


Hello,

I have some trouble with the following:

I have a class derived from TApplication. In its constructor I create a
GUI (a class derived from TMainFrame, which creates two instances of a
class derived from RootEmbeddedCanvas) and a thread. The thread calls
GetCanvas()->Modified() and GetCanvas()->Update() for both embedded
canvases after updating its contents in a loop.
In most cases I get some X11 error about invalid Pixmaps. I guess it is
because TApplication::Run() and the GUI-Update-Loop are running in
different threads. How can I work around this? (Maybe I could use
timers, but for me it is important to run the updating thread with less
priority than the main thread).

Can somebody help me?

Thanks,
Thomas.



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