lkml.org 
[lkml]   [2005]   [Mar]   [24]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: sched.c function


> Tasks do not change their state without holding a
> lock. (There is an exception,
> but it is justified.)
list after that..
>
> So you want to record task state changes? That is
> better done at the right
> places in the kernel rather than traversing the task
> list repeatedly (the
> latter is not that performant).

So you want to say that only one task could be running
at a single time

but how to know which one
is there any way without traversing the task list
previously i thought of for_each_process(p)
if(p->state==running)

but without this how to find which process is
currently running and other are sleeping
may it is through "current"

since the current->pid is only running
but i have to run this repeatedly to get the
information of currently running process(since this
may be for a fraction of a second and i can miss that
process if my loop is longer)
how to do that
fast timer
or any other way
i am little bit confused


> I would be interested in the background: what do you
> need to know the task
> states for?


i want to develop a task manager for threads.
the application reads properly the process information
and the thread information but not able to refresh the
thread information as i am building my own proc file
where only threads are there
i am distinguishing between process and thread at
fork.c
with clone_vm set..

therefore i need to know which thread is currently
running or not


there is another problem i am discusing with you

i want to distinguish between thread and process and
after distinguishing between user thread and kernel
thread
but i am unable to find any condition which will be
true for kernel level thread during creation and false
for user level thread
can you help me in this also
thanks
sounak

________________________________________________________________________
Yahoo! India Matrimony: Find your partner online. http://yahoo.shaadi.com/india-matrimony/
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2005-04-06 13:30    [W:0.058 / U:0.988 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site