[Xenomai] non-blocking rt_task_suspend(NULL)

Petr Cervenka grugh at centrum.cz
Fri Apr 25 10:38:17 CEST 2014


> Od: Gilles Chanteperdrix <gilles.chanteperdrix at xenomai.org>
>
> CC: "Xenomai" <xenomai at xenomai.org>
>On 04/24/2014 05:06 PM, Petr Cervenka wrote:
>>> Od: Gilles Chanteperdrix <gilles.chanteperdrix at xenomai.org>
>>>
>>>> SIGDEBUG signal was not received. Task status from
>>>> rt_task_inquire() was 0x300180 or 0x300380 (depends where it is
>>>> placed) When the task is in the "wrong" state, also the call of
>>>> rt_task_sleep(100000) is returning permanently -EINTR code. Do
>>>> you have any other idea what to check or what can cause perhaps
>>>> every xenomai call fail with -EINTR in one task?
>>>
>>> If I had to debug this issue, I would enable the I-pipe tracer and
>>> trigger a trace freeze when the -EINTR code is received. With
>>> enough trace points, it should be possible to understand what
>>> happens.
>>>
>> I called a xntrace_user_freeze() immediately when the issue occurs,
>> but I simply don't understand what is happening there. The trace
>> output is in the attachment. Could you please help me to understand
>> it?
>>
>> I also got some minor problem with xntrace_user_freeze, because the
>> linker was not able to find it: asyncwriter.cpp:(.text+0x843):
>> undefined reference to `xntrace_user_freeze(unsigned long, int)' It
>> is defined in src/skins/common/trace.c and (should be) contained in
>> libxenomai.so. But I was not successful and I had to define it myself
>> (under different name). Version of xenomai is 2.6.3.
>
>We see that xnpod_suspend_thread returns immediately, likely because it 
>has the XNKICKED bit set. Could you add more back trace points? So that 
>we see what is setting the XNKICKED bit?
>

I have added (maybe too much) back trace points. But as last time, I'm not able to see (almost) anything in it ;-)
Previous xnpod_suspend_thread (on line 3713, probably caused by rt_mutex_aquire) seems to be fine (for me;-) ).

Petr
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