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Date: Fri, 7 Feb 2014 15:22:34 +0000
From: Marcel van Mierlo <marcel.vanmierlo@marel.com>
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Subject: Re: [Xenomai] High CPU load using q_send under pSOS skin
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To: Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>
Cc: xenomai@xenomai.org


On 07/02/14 15:10, Gilles Chanteperdrix wrote:
> On 02/07/2014 04:07 PM, Marcel van Mierlo wrote:
>> TASK cio_watchdog_kick(void)
>> {
>>       u_long cantmsg[4];
>
> This one should be properly aligned, what about the buffer you use for 
> q_recv?
>
>
Hmmm, again, created on the stack. Here is the code for task function 
which invokes q_recv. Will put together a self-contained example.

static int can_transmitter()
{
     u_long tmpmsg[4];
     int count;
     u_long cant_qid;

     while(1)
     {
         if (q_ident("cant", 0, &cant_qid) == 0)
             break;
         tm_wkafter(10);
     }

     while(1)
     {
         if (q_receive(cant_qid, Q_WAIT, Q_WAIT_FOREVER, tmpmsg) == 0)
         {
             count++;
             if ((count % 100) == 0)
             {
                 printf("RECEIVED 100 messages\n");
                 fflush(stdout);
             }
         }
     }
}