Re: [Xenomai-help] Problems with rt_task_wait_period

[Jan Kiszka <jan.kiszka@domain.hid>]

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Philippe Gerum wrote:
> On Mon, 2006-08-07 at 15:45 +0200, Jan Kiszka wrote:
>> Steve Kreyer wrote:
>>> Hi,
>>>
>>> Iam new to xenomai. 
>>> For warming up I try to run this little test program:
>>>
>>> -----------------------------------------------------------------------
>>> #include <native/task.h>
>>> #include <stdio.h>
>>> #include <sys/mman.h>
>>>
>>> RT_TASK task1;
>>>
>>> void rt_task1(void* user_data){
>>>     int err = 0;
>>>     printf("%d\n", rt_task_set_periodic(NULL, TM_NOW, 100));
>> You are running in one-shot mode, thus all time units are in
>> *nanoseconds*. 100 ns cycles tend to pass quite quickly, thus the setup
>> actually fails (but it doesn't report this - a corner case for
>> considering this a bug).
> 
> The setup does not really fail, but the period is so short that the tick
> occurs before the task has a chance to wait for the first release point
> in the timeline, so rt_task_wait_period() notices that no timer is
> outstanding, but incorrectly concludes that no timer was ever armed.

Mmh, wouldn't the box simply lock up if the setup succeeded? It's a
periodic timer... :->

Jan


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