Le 14 avr. 04, à 11:21, Christophe Raffalli a écrit :

> You do not need in general to enter a blocking section when calling C. 
> you only need that if you call some specific Caml function from C (if 
> I remember well)

True, this message [1] confirms it (point 6) and since callbacks are 
not executed concurrently by glut there is no need to serialize them 
with enter/leave_block_section(). Apparently [2] 
enter/leave_blocking_section() are mainly used to allow the execution 
of signal callbacks during execution of long running C code that 
doesn't interact with caml code (this means that if I use the lablglut 
bindings, my signal callbacks will never be executed, so I think it 
would be better to use enter/leave_blocking_section() in the bindings 
as depicted in my previous message).

Regarding your problem, maybe glutMainLoop() is doing busy waiting. You 
can try to look into the code [3], glutMainLoop() is implemented in 
file lib/glut/glut_event.c. However this wouldn't explain the fact that 
your program was running well in another version of your system.

Daniel

[1] <http://caml.inria.fr/archives/200404/msg00258.html>
[2] <http://caml.inria.fr/archives/200304/msg00243.html>
[3] <http://www.opengl.org/resources/libraries/glut/glut37.zip>
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