Re: [Xenomai-help] RE : Native message queue and synchronisation

[Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>]

Berruer Sébastien wrote:
> Hi,
> 
>>>>> I'm running a kernel 2.6.28 with Xenomai 2.4.8 on an ARM architecture
>>>>> (PXA255).
>>>>
>>>>Could you try Xenomai 2.4.9?
>>>
>>> I did it yesterday with the version 2.4.9. But, I still issue the same
>>> problem with the same code.
>>>
>>
>>Ok. Please keep 2.4.8. I did not try to reproduce the bug yet, but in the
>>mean time, could you try the following patch?
>>
>>diff --git a/ksrc/skins/native/queue.c b/ksrc/skins/native/queue.c
>>index 8b7c43e..9184da6 100644
>>--- a/ksrc/skins/native/queue.c
>>+++ b/ksrc/skins/native/queue.c
>>@@ -228,7 +228,8 @@ int rt_queue_create(RT_QUEUE *q,
>>
>>               err = xnheap_init_mapped(&q->bufpool,
>>                                         poolsize,
>>-                                        (mode & Q_DMA) ? GFP_DMA : 0);
>>+                                        XNARCH_SHARED_HEAP_FLAGS |
>>+                                        ((mode & Q_DMA) ? GFP_DMA : 0));
>>                if (err)
>>                        return err;
> 
> I've applied the patch against library's sources.

The code modified by the patch is kernel only, not library. So, in
particular you should recompile Xenomai kernel-space support. Did you do
this.

> 
> In fact, if I remove the sleep from the "display" routine, it works.
> But, I can't assert what was the scheduling of threads. Maybe, it was
> favourable to the other thread to write the data.
> 
> If I enable the sleep call in "mesure" routine, I still issue the same
> problem that before: the system hangs.

How does it hang? Do you get a message on the serial console?


-- 
                                          Gilles