On 03/11/2007, Maurice Lombardi <lombardi@ujf-grenoble.fr> wrote:

André Moreira <adfmoreira@gmail.com> a écrit:

> When I ported it to Linux I started noticing some problems with refresh
> (solved in grx2.4.8). Mouse events (not working in demogrx) are working in
> my application. Now about keyboard.....

> On 29/10/2007, kleiter <gernot.kleiter@sbg.ac.at> wrote:

>> I seem to have a related problem with grx248. The demogrx does not
>> respond to the mouse click so that is does not enter any of the
>> demos.tfor someone new it might not be nice if the demos are not
>> running.
>>
>> Gernot Kleiter
>> Uni. Salzburg, Austria
>>

Please apply the following patch
-------------------------------------------------------
--- xwininp.c~  2007-11-01 23:27:52.000000000 +0100
+++ xwininp.c   2007-11-02 00:00:50.000000000 +0100
@@ -566,7 +566,7 @@
        return;
      }
      while (--count >= 0) {
-      GrMouseEvent ev;
+      GrMouseEvent volatile ev;
        XEvent xev;
        KeySym keysym;
        int btn;
--------------------------------------------------------

There is a weird bug related to the optimisation in gcc.
ev is filled through a macro which calls an asm routine
when in 32 bits mode.
It is then enqueued by an other macro which calls the same
asm routine.
Following the process with a debugger at the assembly level,
I see that the instructions are reordered by gcc so that the enqueing
is made before the filling is complete (the filling is
correctly done, but afterwards).
Declaring ev volatile is a hack that in principle says to
gcc that ev can be modified in a way uncontrolled by gcc, so
do not try to reorder the readings/writings on it.
For me this solve both your problems on xkeys and demogrx.
This is probably not the "right" way to do it, this volatile
attribute has been imagined to solve problems when the memory
is changed by an external process, not by something which seems
to be on the control of gcc. I need to investigate further,
and I have no practice of this stuff ...

Anayway try it.

Maurice

--
        Maurice Lombardi
Laboratoire de  Spectrometrie Physique,
Universite Joseph Fourier de Grenoble, BP87
38402 Saint Martin d'Heres Cedex     FRANCE
Tel: 33 (0)4 76 51 47 51
Fax: 33 (0)4 76 63 54 95
mailto:Maurice.Lombardi@ujf-grenoble.fr