Johan Borkhuis wrote:
> Philippe Gerum wrote:
>> On Thu, 2007-08-02 at 11:47 +0200, Johan Borkhuis wrote:
>>
>>> I am experiencing an unexpected switch to secondary mode in a
>>> rt_timer_tsc2ns call from userspace.
>>>
>>> The following code give a switch:
>>> SRTIME timeStamp;
>>> timeStamp = rt_timer_tsc2ns(rt_timer_tsc());
>>> while((rt_timer_tsc2ns(rt_timer_tsc()) - timeStamp) < (usecs*1000)) {}
>>>
>>> while the following code does not:
>>> RTIME timeStamp;
>>> timeStamp = rt_timer_tsc();
>>> while((rt_timer_tsc() - timeStamp) < (usecs*1000)) {}
>>>
>>> (I know that the second example causes a longer timeout, but this was to
>>> show the testcase).
>>>
>>> When splitting up the 2nd line in the first example I see that the
>>> rt_timer_tsc() call does not cause a switch, but the rt_timer_tsc2ns
>>> does. What am I doing wrong here?
>>>
>>> I am using Xenomai-2.3.2.
>>>
>>>
>> - Which CPU architecture, and which Adeos patch release are you using?
>>
> Processor: ppc 85xx, patch 1.5-03, Xenomai 2.3.2
>
>> - How do you notice the switches, SIGXCPU or /proc/xenomai/stat?
>>
> SIGXCPU
And what does /proc/xenomai/faults show right before and after the SIGXCPU?
Wolfgang.
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