Bug#357830: classpath: deadlock in image drawing code

[Mark Wielaard]

On Sun, 2006-03-19 at 20:18 +0100, Petter Reinholdtsen wrote:
> As reported in bug #348504, classpath can sometimes deadlock when
> image drawing is done in parallel with other graphics operations.
> This was discovered when testing worldwind2d with cacao.
> 
> Mark Wielaard had a look at this problem and proposed a patch that is
> available from
> <URL:http://article.gmane.org/gmane.comp.java.classpath.patches/7660>.
> 
> Please apply this to the next upload of classpath.  I tested this
> patch, and it fixed the deadlock.

That patch is now committed to GNU Classpath cvs.
But since key events aren't fully working yet you will want to have a
scroll wheel mouse and also the following patch installed:
http://article.gmane.org/gmane.comp.java.classpath.patches/7653

> Now cacao get as far as drawing some of the window before reporting
> this error.  Had to use '-Xmx200M' to avoid OOM exceptions.

I used -Xmx750M :)

>   WW2D 0.99.87 by Vitaliy Pronkin <pronvit at gmail.com> starting...
>   The program '.' received an X Window System error.
>   This probably reflects a bug in the program.
>   The error was 'GLXBadRenderRequest'.
>     (Details: serial 266 error_code 164 request_code 145 minor_code 1)
>     (Note to programmers: normally, X errors are reported
>      asynchronously; that is, you will receive the error a while after
>      causing it.  To debug your program, run it with the --sync
>      command line option to change this behavior. You can then get a
>      meaningful backtrace from your debugger if you break on the
>      gdk_x_error() function.)
> 
> This error might be related to the fact that I run ww2d across an ssh
> X tunnel.

That is worrying. That might mean that we have a timing related
drawing/locking bug where multiple thread do try to access X at the same
time. Or there is some bug which makes GLX detection go bonkers when
done over the ssh wire.
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