Hi Vadim,
thank you for the patches - I reviewed and applied them. It's also good
timing since I already wanted to ask the wxWidgets list if I need to
delete the wxGraphicsContext object on my own. I do have a question
though about a problem with the wxGraphicsContext backend of the
wxWidgets driver which puzzles me now for some weeks and I can't find a
solution to that problem. It's also hard to debug and maybe you can
point me in the right direction. Since you already have the plplot
source compiled, maybe it's not too time consuming for you to have a
short look at it.
I use Visual C++ 2008, wxMWS 2.8.9 (shared, debug or release,
USE_GDIPLUS=1 and #define wxUSE_GRAPHICS_CONTEXT 1 in setup.h) and the
latest PLplot version from svn. I use the following line to configure
PLplot:
cmake -G "NMake Makefiles" -DCMAKE_BUILD_TYPE=Debug
-DwxWidgets_CONFIGURATION=mswd -DBUILD_TEST=ON path_to_source
The BUILD_TEST=ON option will also build all examples in the build tree.
Also dynamic drivers are used, so all drivers are in its own dll. After
nmake, I run examples\c++\wxPLplotdemo.exe and I can see that the
wxGraphicsContext backend is used and works. I can close the application
without problem. But if I run one of the console examples, e.g.
examples\c\x01.exe and choose the wxWidgets driver again I can see that
the wxGraphicsContext backend is used, but when I close the program it
hangs. I can't even stop it with Ctrl-C.
If I attach Visual C++ 2008 to the not responding executable and do a
"Break All" I get:
"The process appears to be deadlocked (or is not running any user-mode
code). All threads have been stopped."
The program has stopped at line 51 of ltdl_win32.c where the dll is freed:
FreeLibrary( lastHandle->hinstLib );
The call stack looks like that:
GdiPlus.dll!4ebbfedd()
GdiPlus.dll!4ebbfeb4()
msvcr90d.dll!102560e2()
plplotd.dll!lt_dlexit() Line 51 + 0x11 bytes C
If I use the standard (wxDC) backend with "examples\c\x01c.exe -dev
wxwidgets -drvopt backend=0" the program closes correctly, so this is a
wxGraphicsContext issue.
If I disable dynamic drivers (cmake option -DENABLE_DYNDRIVERS=OFF) this
problem also doesn't occur (FreeLibary is never called since the import
library of the plplot dll is linked in). I try to debug this now for
weeks but in the moment I'm completely at loss where to proceed.
Could you perhaps verify that this problem occurs for you as well and do
you have any propositions how to debug this?
Thanks,
Werner
Vadim Zeitlin wrote:
> Hello again,
>
> Here is another tiny patch, this one to fix a memory leak:
>
> diff -r 7578c8ba1630 drivers/wxwidgets_gc.cpp
> --- a/drivers/wxwidgets_gc.cpp Wed Mar 11 14:37:03 2009 +0100
> +++ b/drivers/wxwidgets_gc.cpp Wed Mar 11 14:40:59 2009 +0100
> @@ -68,6 +68,8 @@
>
> if( m_font )
> delete m_font;
> +
> + delete m_context;
> }
>
>
> This needs to be done because m_context is returned from
> wxGraphicsContext::Create() and its return value must be deleted by caller,
> without it each call to wxPLDevGC::SetExternalBuffer() leaks memory.
>
> Notice that I didn't add a "if( m_context )" check before the delete as it
> is unnecessary (the result of calling delete NULL is defined as a NOP) but,
> of course, please feel free to add it for consistency with the lines above
> if you prefer (or, better, remove the checks above too :-).
>
> Thanks again,
> VZ
>
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--
Dr. Werner Smekal
Institut fuer Allgemeine Physik
Technische Universitaet Wien
Wiedner Hauptstr 8-10
A-1040 Wien
Austria
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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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Apps built with the Adobe(R) Flex(R) framework and Flex Builder(TM) are
powering Web 2.0 with engaging, cross-platform capabilities. Quickly and
easily build your RIAs with Flex Builder, the Eclipse(TM)based development
software that enables intelligent coding and step-through debugging.
Download the free 60 day trial. http://p.sf.net/sfu/www-adobe-com
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