[Xenomai-help] error creating a task with rt_task_spawn

[Xenomai-help] error creating a task with rt_task_spawn

[Karl Reichert]

Hello,

I'm trying to create and start a new thread via rt_task_spawn() but I always get error -3. ("Unknown error: -3")

Any idea?


Thanks in advance
Karl





#include "main.h"

#include <stdio.h>
#include <signal.h>
#include <native/task.h>
#include <native/timer.h>
#include <native/mutex.h>
#include <sys/mman.h>

int i,j,x;
RT_TASK *rx_tsk;

int ret1;
int ret2;

void rx_task(void *cookie);
void cleanup(int dummy);

int main (int argc, char* argv[])
{
	i = 0;
   
   if ( -1 == mlockall (MCL_CURRENT | MCL_FUTURE) ) {
        perror("mlockall: ");
        return -1;
   }

	ret1 = rt_task_spawn(rx_tsk, "rx_task", 0, 1, T_FPU|T_CPU(1), &rx_task, NULL);
	if( ret1 != 0 )
	{
      switch(ret1)
      {
         case -ENOMEM: printf("no memory!\n");
            break;
         case -EEXIST: printf("already registered!\n");
            break;
         case -EPERM: printf("asychron context!\n");
            break;
         default: printf("Unknown error: %i\n", ret1);
            break;
      }
      return -2;
	}

	for(;i<10000;)
	{
		x=i/23%2;
		i++;
		
	}
		
	ret2 = rt_task_delete(rx_tsk);
	if( 0 != ret2 )
	{
		printf("delete error: %i\n", ret2);
      return -3;
	}

	return 0;
}

void rx_task(void *cookie)
{
	j=0;
	j++;
	while(1);
}

-- 
von Karl Reichert

Re: [Xenomai-help] error creating a task with rt_task_spawn

[Sebastian Smolorz]

Karl Reichert wrote:
> Hello,
> 
> I'm trying to create and start a new thread via rt_task_spawn() but I always get error -3. ("Unknown error: -3")
> 
> Any idea?

> #include "main.h"
> 
> #include <stdio.h>
> #include <signal.h>
> #include <native/task.h>
> #include <native/timer.h>
> #include <native/mutex.h>
> #include <sys/mman.h>
> 
> int i,j,x;
> RT_TASK *rx_tsk;

This is a (uninitialized) pointer ...
Maybe you wanted to type
RT_TASK rx_tsk;
?

> 
> int ret1;
> int ret2;
> 
> void rx_task(void *cookie);
> void cleanup(int dummy);
> 
> int main (int argc, char* argv[])
> {
> 	i = 0;
>    
>    if ( -1 == mlockall (MCL_CURRENT | MCL_FUTURE) ) {
>         perror("mlockall: ");
>         return -1;
>    }
> 
> 	ret1 = rt_task_spawn(rx_tsk, "rx_task", 0, 1, T_FPU|T_CPU(1), &rx_task, NULL);

Here you call rt_task_spawn with that pointer rx_tsk. You must provide a 
valid pointer, e.g. &rx_tsk and modify the definition of rx_tsk as above.

-- 
Sebastian

Re: [Xenomai-help] error creating a task with rt_task_spawn

[Karl Reichert]

> Karl Reichert wrote:
> > Hello,
> > 
> > I'm trying to create and start a new thread via rt_task_spawn() but I
> always get error -3. ("Unknown error: -3")
> > 
> > Any idea?
> 
> > #include "main.h"
> > 
> > #include <stdio.h>
> > #include <signal.h>
> > #include <native/task.h>
> > #include <native/timer.h>
> > #include <native/mutex.h>
> > #include <sys/mman.h>
> > 
> > int i,j,x;
> > RT_TASK *rx_tsk;
> 
> This is a (uninitialized) pointer ...
> Maybe you wanted to type
> RT_TASK rx_tsk;
> ?
> 
> > 
> > int ret1;
> > int ret2;
> > 
> > void rx_task(void *cookie);
> > void cleanup(int dummy);
> > 
> > int main (int argc, char* argv[])
> > {
> > 	i = 0;
> >    
> >    if ( -1 == mlockall (MCL_CURRENT | MCL_FUTURE) ) {
> >         perror("mlockall: ");
> >         return -1;
> >    }
> > 
> > 	ret1 = rt_task_spawn(rx_tsk, "rx_task", 0, 1, T_FPU|T_CPU(1), &rx_task,
> NULL);
> 
> Here you call rt_task_spawn with that pointer rx_tsk. You must provide a 
> valid pointer, e.g. &rx_tsk and modify the definition of rx_tsk as above.

Yes, you are right. My fault ...

But after modifying, when I run this program, the computer locks. I can move the mouse and even mouve the windows (Xfree), but I can neither close the window, click any buttons nor enter anything in the terminal-window.

Any ideas?

Thanks
Karl
-- 
von Karl Reichert

Re: [Xenomai-help] error creating a task with rt_task_spawn

[Sebastian Smolorz]

Karl Reichert wrote:
> Yes, you are right. My fault ...
> 
> But after modifying, when I run this program, the computer locks.
> I can move the mouse and even mouve the windows (Xfree), but I can
> neither close the window, click any buttons nor enter anything in
> the terminal-window.
> 
> Any ideas?

Your RT task looks as follows:

> void rx_task(void *cookie)
> {
> 	j=0;
> 	j++;
> 	while(1);
> }

An endless loop in an RT task ... no good idea.

-- 
Sebastian