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Re: task state in a deadlock

once u get the task_struct of the deadlocked process, u can get the
state from the 'state' field in the structure. BTW, how are u going to
find out which process has deadlocked?


On 6/8/06, Ohad Ben-Cohen <ohadbc@xxxxxxxxx> wrote: 
On 6/8/06, Vincenzo Mallozzi <vinjunior@xxxxxxxx> wrote:
> Is there a deterministic way to know if a process is in deadlock have state
> TASK_INTERRUPTIBLE or TASK_UNINTERRUPTIBLE?
> I really need this information to know if some threads are in such a
> situation.
> How can I resolve this problem? Is there another solution?

It's a little weird question. can you please elaborate more on the problem ?
what's going on ? why do you need this ?

if you think you have deadlocks, why not just try to solve them ?
anyway,
you might be interested to examine a recent kernel patch posted by Ingo Molnar,
which is called "the kernel lock validator". it essentially hunts down possible
deadlocks in the kernel. read on in http://lwn.net/Articles/185666/

Ohad.

> Thanks.
> Vincenzo
>
> On Wednesday 07 June 2006 15:16, William J Beksi wrote:
> > Vincenzo Mallozzi wrote:
> >
> > >Hi,
> > >what is the task state of some processes/threads that are in a deadlock
> > >situation?  I've heard about TASK_UNINTERRUPTIBLE. Is not it?
> > >
> > >
> > In a deadlock situation both tasks are waiting for a resource that is
> > held by another task, therefore none of the other tasks waiting for that
> > resource can proceed. In TASK_INTERRUPTIBLE/TASK_UNINTERRUPTIBLE the
> > task is in a sleeping state with the exception that TASK_UNINTERRUPTIBLE
> > cannot be woken up by a signal. So it seems a deadlock can occur with a
> > task in an interruptible or uniterruptible state.
> >
> > William
> >
>
>
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