On Tue, 26 Nov 2002, Marc Recht wrote:
> > I'd like some feedback on whether some heavy threaded apps (GNOME,
> > OpenOffice, Java, etc) have any problems with this patch before
> > asking re@ for commit permission. BTW, it also needs testing on
> > alpha.
> I tried it on i386 (athon-xp) and every app I've tried stalled/locked or
> crashed right away. Mozilla gives me:
> The program '<unknown>' received an X Window System error.
> This probably reflects a bug in the program.
> The error was 'BadValue (integer parameter out of range for operation)'.
> (Details: serial 4773 error_code 2 request_code 53 minor_code 0)
> (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.)
Damn, I think I found a problem. Perhaps it might be what's
causing your problem. Do you have I686_CPU defined in
your kernel? If so can you either try it with a kernel
without I686_CPU or with CPU_DISABLE_SSE?
The kernel doesn't align the FPU registers (context) properly.
Actually, neither does anything in userland because the
machine contexts lack align directives.
You can also try modifying the patched uthread_kern.c,
function _thread_kern_sched(). There's a section about
halfway down that looks something like this:
/*
* Return to the interrupted context. We are careful
* not to use the context saved in the thread because
* we may have been interrupted by another signal which
* would have destroyed it. This context is saved by
* the kernel on the thread's stack so it is safe from
* nested signals.
*/
ucp->uc_sigmask = _process_sigmask;
THR_SETCONTEXT(ucp);
PANIC("Resume from setcontext in _thread_kern_sched");
}
else {
do {
Change the THR_SETCONTEXT(ucp) to sigreturn(ucp).
--
Dan Eischen
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