Hi Thomas, When Root is compiled with -DREENTRANT (the default) with the root installation, gPad IS NOT a global variable. It is a pointer to a function that is Thread safe (with the relevant Mutex inside). Could you send us a short example reproducing your problem? Rene Brun Thomas Bretz wrote: > > Dear all, > > I have: > Two TCanvas (c1 and c2) > > I'm filling c1 from thread 1 (c1->cd(); obj->Draw();) and the same in > thread 2 for a different object and c2. > > In some cases this gives wrong results, becuase gPad (which is set in > c1->cd() and c2->Ccd()) is global. Because the decision into whih canvas I > want to draw (cd()) is done at a completely different place in my program > than calling draw it would need a big effort to use Mutices here. > > Has somebody an idea how I could make this thread-safe? > > Thanks, > Thomas.
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