[Xenomai-help] RT Task as a kernel module halts the whole system

[Xenomai-help] RT Task as a kernel module halts the whole system

[Shashank Bhatia]

Dear All,

            I wrote a simple RT task to be run as kernel module and tried to 
run it. As soon as i issue the insmod command, it halts the whole system.
Please help me out,

The code is as follows:

#include <linux/module.h>   // required by all modules
#include <linux/kernel.h>   // required by printk()
#include <linux/init.h>
#include <posix/sys/mman.h>
#include <native/task.h>
#include <native/alarm.h>

#define TASK_PRI  50
#define TASK_MODE T_FPU|T_CPU(0)
#define STAK_SIZE 4096


#define ALARM_VAL 500000
#define ALRAM_INT 25000000

RT_ALARM alarm;
RT_TASK  alarm_handler;
int err;


void alarm_hand_func(void *cookie)
{

                if(!err)
                {
                        // do the periodic task
                }
}


MODULE_LICENSE("GPL");
MODULE_AUTHOR("Shashank");

// Start/Init function
static int hello_init(void) {

        printk(KERN_ALERT "Hello world!\n");  // A logging mechanism for 
kernel

        err = rt_alarm_create(&alarm,"myAlarm");

        err = rt_alarm_start(&alarm,ALARM_VAL,ALARM_INT);

err=rt_task_create(&alarm_handler, "ALARMtask",STAK_SIZE,TASK_PRI,TASK_MODE);

        if(!err)
                rt_task_start(&alarm_handler,&alarm_hand_func,NULL);

        return 0;                             // A non-zero return means 
hello_init failed; the module can't be loaded.
}

// End/Cleanup function
static void hello_exit(void) {

        //rt_task_delete(&alarm_handler);

        rt_alarm_delete(&alarm);

        printk(KERN_ALERT "Goodbye world!\n");
}

module_init(hello_init);
module_exit(hello_exit);

-------------------------------------
Hi-Tech Gears Limited, Gurgaon, India

Re: [Xenomai-help] RT Task as a kernel module halts the whole system

[Stefan Kisdaroczi]

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Hi,

Shashank Bhatia schrieb:
> Dear All,
> 
>             I wrote a simple RT task to be run as kernel module and tried to 
> run it. As soon as i issue the insmod command, it halts the whole system.
> Please help me out,
> 
> The code is as follows:
> [...]
> 
>         err = rt_alarm_create(&alarm,"myAlarm");

looking at the xenomai docs [1], there are two rt_alarm_create() functions,
one for kernel-space and one for userspace:

int rt_alarm_create (RT_ALARM *alarm, const char *)
    Create an alarm object from user-space.

int rt_alarm_create (RT_ALARM *alarm, const char *name, rt_alarm_t handler, void *cookie)
    Create an alarm object from kernel space.

It seems you are using the wrong one.

For a user-space alarm example and other code-snippets look in the directory
ksrc/skins/native/snippets/

kisda

[1] http://www.xenomai.org/documentation/branches/v2.4.x/html/api/index.html


>         err = rt_alarm_start(&alarm,ALARM_VAL,ALARM_INT);
> 
> err=rt_task_create(&alarm_handler, "ALARMtask",STAK_SIZE,TASK_PRI,TASK_MODE);
> 
>         if(!err)
>                 rt_task_start(&alarm_handler,&alarm_hand_func,NULL);
> 
>         return 0;                             // A non-zero return means 
> hello_init failed; the module can't be loaded.
> }
> 
> // End/Cleanup function
> static void hello_exit(void) {
> 
>         //rt_task_delete(&alarm_handler);
> 
>         rt_alarm_delete(&alarm);
> 
>         printk(KERN_ALERT "Goodbye world!\n");
> }
> 
> module_init(hello_init);
> module_exit(hello_exit);
> 
> -------------------------------------
> Hi-Tech Gears Limited, Gurgaon, India
> 
> 
> 
> 
> 
> _______________________________________________
> Xenomai-help mailing list
> Xenomai-help@domain.hid
> https://mail.gna.org/listinfo/xenomai-help
> 



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