Re: [Xenomai-help] Problems with rt_task_wait_period

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

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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).

>     err = rt_task_wait_period(NULL);
>     if(err){
>         fprintf(stderr, "Cannot wait periodic: %d, %d\n", err, EWOULDBLOCK);
> 
>     }
> }
> 
> int main(){
>     char* task1_data = NULL;
>     mlockall(MCL_CURRENT|MCL_FUTURE);
>     rt_timer_set_mode(TM_ONESHOT);
>     rt_task_spawn(&task1, "task1", 0, 99, 0, rt_task1, &task1_data);
>     sleep(10);
>     rt_task_delete(&task1);
>     return 0;
> }
> -----------------------------------------------------------------------
> 
> But rt_task_wait_period gives me always the Error EWOULDBLOCK, which means that I did not set the task periodic
> but which in fact I did... The call to rt_task_set_periodic is succesful.
> Can anyone help me figure out why? If you need additional infos please let me know...
> 
> Thanks in advance!
> 
> Steve
> 

Jan


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