[Xenomai-help] array declaration of double values causes seg faults

[Xenomai-help] array declaration of double values causes seg faults

[Axel Beierlein]

Hello,

i try to use a simple function inside of an RT-Task in Userspace. Inside  
of this function i only declare three array´s of doubles with 5000 values  
in it.
When i run the program a seg fault was shown. When i replace the array  
declaration with an printf the seg fault is away.

Do i have memory limitations inside of an RT-Task?

I use Xeno 2.3.1 with an 2.4.25 Kernel

Axel

Re: [Xenomai-help] array declaration of double values causes seg faults

[CHABAL David]

Axel Beierlein a écrit :
> Hello,
> 
> i try to use a simple function inside of an RT-Task in Userspace. Inside  
> of this function i only declare three array´s of doubles with 5000 values  
> in it.
> When i run the program a seg fault was shown. When i replace the array  
> declaration with an printf the seg fault is away.
> 
> Do i have memory limitations inside of an RT-Task?
> 
> I use Xeno 2.3.1 with an 2.4.25 Kernel
> 
> Axel
> 
> _______________________________________________
> Xenomai-help mailing list
> Xenomai-help@domain.hid
> https://mail.gna.org/listinfo/xenomai-help


Hello,

I don't know what is your arch but I think it's a stack overflow problem.

Try to declare your array as static or increase the stack size value (may be 4Ko on i386?)

David

Re: [Xenomai-help] array declaration of double values causes seg faults

[Gilles Chanteperdrix]

On 10/19/07, Axel Beierlein <belatronix@domain.hid> wrote:
> Hello,
>
> i try to use a simple function inside of an RT-Task in Userspace. Inside
> of this function i only declare three array´s of doubles with 5000 values
> in it.
> When i run the program a seg fault was shown. When i replace the array
> declaration with an printf the seg fault is away.
>
> Do i have memory limitations inside of an RT-Task?
>
> I use Xeno 2.3.1 with an 2.4.25 Kernel

When declaring variables in a function, memory is reserved on the
stack. So, if you get a segfault, you probably exhausted the RT-task
stack.

-- 
                                               Gilles Chanteperdrix