Re: [Xenomai-help] the same error

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

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marcellin wrote:
> well, I've made some little modifications, now i use the
> "rt_task_shadow()  function", but  from  the  "rt_intr_wait() function" 
> the  numerical  error is  "-1".  To answer to Gilles, i use the RTC irq
> because i work on a (slow) acquisition system wich works continuously,
> and don't allow time drifts. The use of xenomai is to have tiny latencies.
> 
> the modified test program :
> 
> #include <sys/mman.h>
> #include <sys/time.h>
> #include <unistd.h>
> #include <stdlib.h>
> #include <stdio.h>
> #include <string.h>
> #include <signal.h>
> #include <getopt.h>
> #include <time.h>
> #include <native/task.h>
> #include <native/mutex.h>
> #include <native/timer.h>
> #include <native/sem.h>
> #include <native/intr.h>
> #include <native/cond.h>
> #include <rtdm/rtbenchmark.h>
> #include <linux/rtc.h>
> #include <sys/ioctl.h>
> //#include <sys/time.h>
> //#include <sys/types.h>
> #include <fcntl.h>
> #include <errno.h>
> 
> 
> RT_TASK task;
> 
> RT_TASK main_task;
> 
> 
> RT_INTR intr_desc;
> 
> RT_COND cond;
> 
> RT_MUTEX mutextest;
> 
> int err,fd,retval,i,irqcount = 0;
> unsigned long data;
> char err_message[80];
> const int TIMER_IRQ = 8;
> 
> void mytask(void * cookie)
> {
>  sleep(1);
>  err = rt_cond_signal(&cond);
>  if(err != 0){
>    printf("\nrt_cond_signal : %i\n",err);
>  }
>        
> }
> 
> int main (int argc, char **argv)
> {
> 
>  mlockall(MCL_CURRENT | MCL_FUTURE);
>    rt_timer_set_mode(TM_ONESHOT);
> 
>  err = rt_task_shadow(&main_task,"main_task",11,0);  if(err !=
> 0){                                                                     
> printf("\nrt_task_shadow : %i",err);
>  }
> 
>  err = rt_cond_create(&cond,"condition");
>  if(err != 0){
>    printf("\nrt_cond_create : %i",err);
>  }
>  err = rt_mutex_create(&mutextest,"mut");
>  if(err != 0){
>    printf("\nrt_mutex_create : %i",err);
>  }
> 
>  err = rt_task_create(&task,"SecondTask",0,99,0);
>  if(err != 0){
>    printf("\nrt_task_create : %i",err);
>  }
>  err = rt_task_start(&task,&mytask,NULL);
>  if(err != 0){
>    printf("\nrt_task_start : %i",err);
>  }
> 
>  err = rt_cond_wait(&cond,&mutextest,20000000);

This service is very similar to POSIX condition variables: you have to
acquire the mutex before you can wait on the condition.

>  if(err != 0){
>    printf("\nrt_cond_wait : %i",err);
>  }
>  printf("\nend \n");
> 
>  rt_mutex_delete(&mutextest);
>  rt_cond_delete(&cond);
>  rt_task_delete(&main_task);
>  rt_task_delete(&task);
> 
> return(0);
> 
> }
> 
> 
> regards
> 
> Marcell1
> 

Jan


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