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Date: Mon, 20 Oct 2008 22:59:56 +0200
From: Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>
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Subject: Re: [Xenomai-core] Warning when compiling trunk.
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To: Jan Kiszka <jan.kiszka@domain.hid>
Cc: Xenomai core <Xenomai-core@domain.hid>

Jan Kiszka wrote:
> Gilles Chanteperdrix wrote:
>> Gilles Chanteperdrix wrote:
>>> Jan Kiszka wrote:
>>>> Gilles Chanteperdrix wrote:
>>>>> I get this warning when compiling trunk:
>>>>>
>>>>> checking for __thread... rm: cannot remove `conftest1.dir': Is a directory
>>>>> yes
>>>>>
>>>> That simple, it's a typo in this line:
>>>>
>>>> http://www.rts.uni-hannover.de/xenomai/lxr/source/configure.in?v=SVN-trunk#394
>>>>
>>>> Also, that rm should be done outside the if block to play safe.
>>> Ok. But once this is fixed, I get a segmentation fault with __thread on
>>> ARM in rt_task_trampoline. I am currently testing the SIGWINCH thing,
>>> and if __thread is disabled, there is no segfault.
>> If a #ifdef 0 xeno_set_current, there is no segfault.
>>
> 
> Interesting. What about removing the initial-exec attributes? Is
> __thread otherwise know to work on your platform?

Yes. This is a race condition, the real bug is, IMHO:
	__native_self = *iargs->task;
When the segfault happens iargs->task is NULL. I suspect you are not
supposed to use iargs after the __native_task_create syscall.

-- 
					    Gilles.