segfault in multithread OpenGL app on i915

[Nickolay Kolchin]

On 9/30/06, Brian Paul <brian.paul at tungstengraphics.com> wrote:
> Nickolay Kolchin wrote:
> > Hello,
> >
> > I have a weird problem with multithread application on i915 chipset
> > (i810 DRI driver). Application segfaults when trying to use OpenGL
> > functions from second thread.
> >
> > All necessary initialization is perfomed in application, ie
> > XInitThreads, etc.
> >
> > Tested on Suse 10.1 (xorg 6.8, 20050225 i810 driver) and Gentoo
> > LiveDVD (xorg 7.0, 1.4.2 i810 driver).
> >
> > This code works fine with NVidia drivers. (for several years)
> >
> > Is this a driver bug? a Mesa bug? a well-known bug that nobody is
> > going to fix in near future? Or this is my programming error?
>
> Have you tried the Mesa/progs/xdemos/glthreads.c program?
>
> It's pretty simple, but might be a good cross-check.
>
> In my experience, Xlib's thread safety is pretty fragile.  Even with
> XInitThreads(), XLock/UnlockDisplay(), etc. it's hard to get threaded
> apps working reliably.
>

Tested under Suse. glthreads also segfaults. :(

--
Nickolay