Regarding acquiring a lock: I realize this may be a stupid question, but how does one go about doing this? Can you provide a short code example? Thanks -----Original Message----- From: kernelnewbies-bounce@nl.linux.org [mailto:kernelnewbies-bounce@nl.linux.org]On Behalf Of Dhiman, Gaurav Sent: Thursday, July 01, 2004 9:27 AM To: Anupam Kapoor; manish regmi Cc: so_usp@yahoo.com.br; kernelnewbies@nl.linux.org Subject: RE: List of Processes We need to acquire lock before accessing any common data structure of kernel. As the "task_struct" list is the common data structure of kernel which is accessed from different places in kernel. We need to acquire the lock for this task list before accessing it, so that when we are accessing the list no other process context or kernel thread should be able to access it. Regards, Gaurav -----Original Message----- From: kernelnewbies-bounce@nl.linux.org [mailto:kernelnewbies-bounce@nl.linux.org] On Behalf Of Anupam Kapoor Sent: Thursday, July 01, 2004 3:18 PM To: manish regmi Cc: so_usp@yahoo.com.br; kernelnewbies@nl.linux.org Subject: Re: List of Processes one small doubt, shouldn't we be acquiring a lock while iterating over all the tasks ? anupam On Thu, 01 Jul 2004 07:20:25 +0000, manish regmi <manish_regmi@hotmail.com> wrote: > > > > >>iirc there is a macro defined already "for_each_process" that you can > >use to get all the processes > > > >struct task_struct *p; > > > >for_each_process (p) { > > .... > >} > > > >hth > >kind regards > >anupam > > /* sched.h */ > > for_each_task(p){ > ... > } > > :) > > > > > Hi.... > > > > > > I would like to know which file i can find the struct > > > that list all processes executing in linux... > > > > > > Thanks, > > > Luis Henrique. > > for_each_task(p) > { > ... > } > > You will each task's descriptor on p on each loop. The first one will be > that of init. You will automatically break from loop when you finish > traverse through all tasks. > Actually a circular list. > > #define for_each_task(p) \ > for (p = &init_task ; (p = p->next_task) != &init_task ; ) > > regards manish > > _________________________________________________________________ > Add photos to your messages with MSN 8. Get 2 months FREE*. > http://join.msn.com/?page=features/featuredemail > > -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/ -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/ -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
