From mboxrd@z Thu Jan  1 00:00:00 1970
From: ZIV-Alberto Ozalla Cantabrana <alberto.ozalla@cgglobal.com>
Date: Fri, 7 Nov 2014 09:25:21 +0000
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Subject: Re: [Xenomai] rt_task_sleep_until() miss release point?
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On 06/11/14 21:22, Philippe Gerum wrote:
> On 11/06/2014 05:46 PM, ZIV-Alberto Ozalla Cantabrana wrote:
>> Hi,
>>
>> These are the simplest examples:
>> There are no MSW for Test_Task.
>> The goal is to increment counter_ms each millisecond.
>>
>> Given that:
>> 1000000 nanoseconds =3D 24000 tsc.
>> 1 tsc =3D 41 ns
>>
> Is rt_timer_ns2tsc(1000000) actually returning 24000 on your platform?
> Yes.
>> void Test_Task(void *arg)
>> {
>>     rt_task_set_mode(0, 0, NULL);
> This is useless and not recommended. A newly created task always starts
> in primary mode.
>
> Ok. I will delete it.
>>      while (1) {
>>
>>              unsigned long long before =3D counter_ms;
>>              usleep(1000000);    // 1 second.
> Although this would rather cause higher count values, this non-rt main
> using a non-rt sleep service won't give you an accurate delay for the
> measurement.
>
> It is only an example.

--=20
Saludos,
Alberto Ozalla


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