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Date: Mon, 06 Jan 2014 08:58:37 +0100
From: Philippe Gerum <rpm@xenomai.org>
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Subject: Re: [Xenomai] rtdm_task_init call freezes the system
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To: Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>
Cc: xenomai@xenomai.org

On 01/05/2014 08:28 PM, Gilles Chanteperdrix wrote:
> On 01/05/2014 01:02 PM, Philippe Gerum wrote:
>> On 01/05/2014 01:25 AM, Nima Nourozi wrote:
>>> On Sat, Jan 4, 2014 at 2:57 PM, Philippe Gerum <rpm@xenomai.org
>>> <mailto:rpm@xenomai.org>> wrote:
>>>
>>>      On 01/04/2014 09:29 PM, Nima Nourozi wrote:
>>>
>>>          Here is the task function. But I'm not seeing the printout.
>>>
>>>          void xx_start_transfer(void *arg) {
>>>              rtdm_wait_period();
>>>
>>>
>>>      What about checking the return code of rtdm_wait_period()? If
>>>      something goes wrong there, you do want to know, instead of entering
>>>      a tight runaway loop.
>>>
>>>      --
>>>      Philippe.
>>>
>>>
>>> I can't print anything since the system freezes so I don't know how I
>>> can check return value? Also, what loop are you referring to I don't
>>> have a loop just a print statement.
>>
>> It does not make sense to have a single wait statement in a periodic
>> task, you should have a loop. Or you don't have periodic task. So your
>> task should implement a loop.
>>
>> To force a direct output through the serial console port, you may want
>> to try enabling DEBUG_LL and IPIPE_DEBUG, then call
>> __ipipe_serial_debug(), instead of printk. Do not use this in regular
>> code, this is for debugging purpose only, in mostly hopeless situations
>> where using buffered console output is not an option.
>
> I do not think 2.6.38 has __ipipe_serial_debug,

It does. printascii() alone would not prevent output races, so it's 
better to use __ipipe_serial_debug() for this.

  it as printascii though.
>
>

-- 
Philippe.