Re: stopping a process temporarily

[Pooja Gupta <pooja_pict@yahoo.com>]

Hi Vamsi,
   You can do this by just having the task_struct for
the task you want to make to sleep.  

You can use the macros predefined in linux/sched.h
like set_task_state(....)  or set_current_state(..) by
the different states in the same file.   Set the state
to TASK_INTERRUPTIBLE, etc.Call schedule() after that.

You can even use interruptible_sleep_on(..) for making
the process sleep.
   
To find out the task_struct, use the function
find_task_by_pid(..).


You can easily do this.  This has worked out in my
code.

Hope this helps,

Pooja.

  

 --- "Vamsi Krishna S ." <vamsi@in.ibm.com> wrote: >
Hello,
> 
> I need to stop a process temporarily from the
> context of a different process.
> 
> I can't send it SIGKILL, I need to stop it
> _temporarily_. 
> I can't send it SIGSTOP (I think); if the process is
> being ptrace'd the parent
> will get control, not what we want.
> 
> I suspect we should be able to achieve this by
> fiddling with task->state bits
> but not sure, especially considering that the target
> process could be in
> any state (running/blocked/readytorun ...) when we
> want to do this.
> 
> Any ideas/help greatly appreciated.
> 
> Thanks,
> -- 
> 
> Vamsi Krishna S.
> Linux Technology Center,
> IBM Software Lab, Bangalore.
> Ph: +91 80 5262355 Extn: 3959
> Internet: vamsi@in.ibm.com


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