Hi Ron,
Thanks a lot for your help. After spending a lot of hours, I think that the
following factors seems contributed to the crash:
1. OpenSceneGraph uses STL a lot, and some STL classes manage their own
memory.
2. I verified on Linux, similar setup worked. Thus the Flightgear and
OpenSceneGraph code seems fine.
3. In my previous MinGW, libstdc++ is a statically linked, and it's based on
static version of system C library MSVCRT. For .EXE or .DLL modules which
are statically-linked C Run-time library, problem can occur in some
situations, such as allocating memory with a C Run-time call in the
.EXE/DLL and reallocating or freeing it in the other module. Each of these
.EXE or .DLL has its own heap space. I think in my case, allocating memory
in one heap space, and freeing it in another heap space eventually crashed
the system. When tracing the execution in Eclipse, I noticed that in some
situations, after exiting a function, it came back to execute the last few
lines of the same function again. The following are some links for someone
interested in details of this cross DLL/EXE issue:
http://www.nabble.com/C++-STL,-DLLs-and-our-friend-RtlFreeHeap-t1847074.html
http://mail-archives.apache.org/mod_mbox/xerces-c-dev/200004.mbox/[EMAIL
PROTECTED]
http://lists.trolltech.com/qt-interest/2004-12/thread00928-0.html
http://lists.trolltech.com/qt-interest/2001-10/thread00530-0.html
http://support.microsoft.com/kb/140584
http://support.microsoft.com/kb/94248
As suggested in the the above links, we need a DLL version of libstdc++ in
MinGW. Fortunately in the latest preview version of gcc 4.2.1,
there is such a libstdc++. With some further steps like creating the missing
libgcc_s.a, etc, I finally made CVS version of Flightgear with
OpenSceneGraph worked with MinGW/MSYS on both Windows XP and Vista. FGRun
also worked with MinGW/MSYS. If anyone is interested in details, please let
me know.
Thanks,
Robert Fu
On 9/11/07, Ron Jensen <[EMAIL PROTECTED]> wrote:
>
> On Tue, 2007-09-11 at 09:37 -0700, Robert Fu wrote:
> > Hi Ron,
> >
>
> > So I set HOME environment variable, and the Nasal error disappeared
> > when running in DOS-Prompt. I noticed before that when running in
> > MSYS, I got different console output, and I realize now that in MSYS,
> > there is HOME environment variable.
>
> Cool :)
>
> > However, I got a different problem, and this time, there is no error
> > in console output. A Windows "Send Error Report" dialog came up, after
> > clicking on Don't Send button, fgfs application exited. When I turned
> > on log-level as the following
> >
> > fgfs --httpd=5500 --log-level=info
> >
> > There are a lot message output in console, and the last few lines are:
> >
> > Adding subsystem nasal
> > trying to load aircraft data from
> > c:/gnu/depot/home/rfu/.fgfs/aircraft-data/c172p.xml (OK if not found)
> > Cannot load flight from
> > c:/gnu/depot/home/rfu/.fgfs/aircraft-data/c172p.xml
>
> The above lines shouldn't be a problem as
> ~/.fgfs/aircraft-data/c172p.xml doesn't exist here, either...
>
> > loading scenario 'aircraft_demo'
> > Reading image "C:\gnu\msys\1.0.11\local\src\FlightGear-0.9\data
> > \Aircraft\737-300\Models\733UAii.rgb"
> > Reading model "C:/gnu/msys/1.0.11/local/src/FlightGear-
> > 0.9/data/Aircraft/737-300/Models/737-300.ac"
> >
> >
> > Splash screen progress setting up time & renderer
> >
> >
> > If I click on Debug button on the Send Error Report dialog, I got:
> >
> > unhandled exception in fgfs.exe:0xC0000005: Access Violation.
> >
> > I guess something might not be loaded correctly, and I'll do more
> > tracing, and any advice is welcome.
>
>
> Perhaps its not liking the aircraft demo? Try turning off ai-models and
> the traffic manager with this command line:
>
> fgfs --disable-ai-models --prop:/sim/traffic-manager/enabled=0
>
> Or go into $FGROOT/preferences.xml and comment out the aircraft-demo, it
> should be around line 459.
>
>
> > I have one question though: which version of pthread should be used
> > with the latest FlightGear? I used pthreads-w32 2.8.0, and I'm not
> > sure if it'll cause any problem.
>
> I have no idea, I'm not on windows. I believe I'm just using the
> pthreads built into libc6.
>
> You could try asking on IRC as well...
>
> Ron
>
>
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