Re: [Xenomai-help] Floating Point Exceptions in RT-Tasks

[Philippe Gerum <rpm@xenomai.org>]

roderik.wildenburg@domain.hid wrote:
>> Unfortunately, I'm not able to reproduce this bug on my side, 
>> even using the 
>> latest linuxppc_devel tree. I have attached my test code to 
>> make sure we are 
>> testing the same thing. This test code does raise the FPU 
>> exception properly.
> 
> This program produces a core here too (Xeno 2.4.6).
> May I remember that Thomas got a core too, when he forced a switch to secondary mode.
> Probably your task_suspend is something similar.
> 

rt_task_suspend() is a conforming call; on behalf of a Xenomai task, it will
switch to (or remain in) _primary_ mode, this is precisely why this test is
using it. As a matter of fact, fetest.c does trigger the exception as well with
my setup, albeit it does not on yours, so the explanation must be elsewhere.

> 
> Thomas´ original post from 13.2.09
> ===================================
> 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?
> 
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