Re: sleep process, wait queues

[Deepak Joshi <deepak_cins@xxxxxxxxxxx>]

--- Deepak Joshi <deepak_cins@xxxxxxxxxxx> wrote:

> #include <linux/module.h>
> #include <linux/kernel.h>
> #include <linux/wait.h>
> #include <linux/sched.h>
> #include <linux/list.h>
> MODULE_LICENSE("GPL");
>                                                     
>  
>                                           
> static DECLARE_WAIT_QUEUE_HEAD (my_queue);
> int init_module(void)
> {
>         struct task_struct *my_task ;
>         my_task = find_task_by_pid(1477);
>         DECLARE_WAITQUEUE(wait, my_task);
>         my_task->state = TASK_UNINTERRUPTIBLE ;
>         init_waitqueue_entry( &wait, my_task);
>         add_wait_queue( &my_queue , &wait);
>         sleep_on(&my_queue);
>         interruptible_sleep_on(&my_queue);
>         schedule( );
>         return 0;
> }
> 
> 
> void cleanuo_module()
> {
>         printk("Bye");
>         wake_up( &my_queue );
> }
> 
> 
> 
> 
> Hi  everyone,
> 
> In the above module I want to sleep the process
> having
> pid 1477 ( which is mpg123 player in my case in wait
> queue ). Instead of sleeping the process with the
> given pid it is hanging insmod command. so plz tell
> me
> what is wrong in the above code.
> 

I tried the same module without schedule() function
and instead of TASK_UNINTERRUPTIBLE I used
TASK_INTERRUPTIBLE but i am getting the same result.
and the output of ps command gives D status for insmod
command. I think it is sleeping the current process
i.e insmod sleep.o only.  But i want to sleep the
process of which i gave the pid. plz reply me where i
am wrong.

Thanks and regrads,
Deepak Joshi.





		
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