Hi Vadim,
> FWIW I used (after reading documentation and wiki)
>
> -DwxWidgets_LIB_DIR=$wxwin/lib/vc_dll -DwxWidgets_CONFIGURATION=mswud
> -DwxWidgets_USE_UNICODE=ON -DDEFAULT_NO_BINDINGS=ON -DENABLE_cxx=ON
> -DENABLE_wxwidgets=ON -DDEFAULT_NO_DEVICES=ON -DPLD_wxwidgets=ON
>
You should still have dynamic drivers enabled, i.e. the wxwidgets driver
is compiled as a single dll and loaded on demand. Using the
wxGraphicsContext backend from within a wxWidgets application is no
problem though (don't know why exactly).
> I didn't try reproducing this yet but my guess would be that it's just
> another example of deadlocking on the loader lock: you can't call
> FreeLibrary() (nor LoadLibrary() but this is more rare) from DllMain()
> because the DLL load mutex is locked when DllMain() is called and
> attempting to lock it again from FreeLibrary() deadlocks. So if lt_dlexit()
> is itself called from DllMain() this would explain it. And you should be
> able to find plenty more about this (painful) topic on the web, here is one
> of the first Google matches from a reputable source:
>
> http://blogs.msdn.com/oldnewthing/archive/2004/01/28/63880.aspx
>
>
> But even if the problem is almost surely due to this, fixing it might be
> non-trivial. I don't know PLplot well enough to see if there is a
> possibility to do the cleanup earlier, is there?
>
Actually PLplot calls all drivers and ask them to tidy up. In the
wxWidgets driver I do:
if( dev->ownGUI ) {
wxPLGetApp().RemoveFrame( dev->m_frame );
if( !wxPLGetApp().FrameCount() )
wxUninitialize();
}
delete dev;
pls->dev=NULL; /* since in plcore.c pls->dev is free_mem'd */
When I delete dev, the deconstructor of wxPLDevGC gets called (confirmed
that). I would like to release the GDI stuff at this place, but this is
not possible since the wxGDIPlusRenderer is defined in graphics.cpp:
static wxGDIPlusRenderer gs_GDIPlusRenderer;
and the deconstructor will be called when this object will be destroyed
- presumably when FreeLibrary is called. Then gdiplus is also shutdown
if ( m_gditoken )
GdiplusShutdown(m_gditoken);
I could try to define my own GDIPlus renderer to have complete control
when the renderer is destroyed - but I'm not sure if this solves the
problem. Or should I write my own dllmain function for the plplot
library or wxwidgets driver?
I'll post when I find something. Thank you very much for this hint - I
can try now different approaches to get hold of this bug.
Regards,
Werner
--
Dr. Werner Smekal
Institut fuer Allgemeine Physik
Technische Universitaet Wien
Wiedner Hauptstr 8-10
A-1040 Wien
Austria
DVR-Nr: 0005886
email: [email protected]
web: http://www.iap.tuwien.ac.at/~smekal
phone: +43-(0)1-58801-13463 (office)
+43-(0)1-58801-13469 (laboratory)
fax: +43-(0)1-58801-13499
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