Re: [Xenomai-help] General question on Native Skin tasks

[Philippe Gerum <rpm@xenomai.org>]

Philippe Gerum wrote:
> Jan Kiszka wrote:
> 
>> Brian L. wrote:
>>
>>> If I create a native-skin RT_TASK from userspace with no flags, i.e.
>>>
>>> void task(void*)
>>> {
>>>    for (;;) ;
>>> }
>>> int main()
>>> {
>>>   RT_TASK t;
>>>   rt_task_create(&t, 0, 3, 0);
>>>   rt_task_start(&t,task,0);
>>>   (do something which blocks)
>>> }
>>
>>
>>
>> mlockall left out for simplicity? Or is it also missing on your real
>> test? In the latter case, occasional application crashes are "normal"
>> (as described below).
>>
>> Philippe, you suggested some code for detecting this. We should really,
>> really add this soon (maybe to the exception path)!
>>
> 
> The submitted patch works pretty well detecting unlocked memory, I'm 
> using it right now, but I'd like something a bit more self-explanatory 
> than just receiving SIGXCPU. I don't think the execption path is the 
> right place to put this, since the mlockall issue causes random bugs, 
> and you likely want to detect them early and unconditionally.
> 

Commit #941 should provide a reliable guard against lack of process 
memory locking.

-- 

Philippe.