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Date: Thu, 02 Aug 2007 12:54:22 +0200
From: Johan Borkhuis <j.borkhuis@domain.hid>
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Subject: Re: [Xenomai-help] Unexpected switch to secondary mode
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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

Kind regards,
    Johan Borkhuis