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Re: task state in a deadlock

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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Kernelnewbies: Help each other learn about the Linux kernel.
Archive:       http://mail.nl.linux.org/kernelnewbies/
FAQ:           http://kernelnewbies.org/faq/