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Date: Fri, 13 Feb 2009 15:40:19 +0100
From: Philippe Gerum <rpm@xenomai.org>
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Subject: Re: [Xenomai-help] Floating Point Exceptions in RT-Tasks
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To: thomas.debes@domain.hid
Cc: xenomai@xenomai.org

thomas.debes@domain.hid wrote:
> Hi,
> 
> I successfully managed to enable FP Exceptions on our MPC5200 board for
> plain linux applications (via fesetenv). When I put the same trigger
> code (DivByZero) into a (native) RT task no exception is triggered until
> I force a mode switch to secondary mode (e.g. printf). How can I get
> them without performing the mode switch?
> 

Could you check whether the following test does raise an exception on your
setup? TIA,

#include <sys/types.h>
#include <sys/mman.h>
#include <stdio.h>
#include <fenv.h>
#include <native/task.h>

double z;

int main (int argc, char **argv)
{
	double a = 23.0;

	z = 0;
	fesetenv(FE_ENABLED_ENV);

        mlockall(MCL_CURRENT | MCL_FUTURE);

	rt_task_shadow(NULL, "main", 10, 0);
	a /= z;
	rt_task_suspend(NULL);

	return (int)a;
}

> Thanks for your help!
> Thomas
> 
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> 


-- 
Philippe.