mutual exclusion

"Dinesh Gandhewar" <dinesh_gandhewar@rediffmail.com> · 25 Jul 2003 05:19:33 -0000

Hello,

I am writting a driver for card in Linux-2.4.20. In this I have a 
shared linked list of transactions. This list is shared between 
timer interrupt handler, device interrupt handler and system call. 
I have a uniprocessor system. How do I ensure mutual exclusion on 
this shared linked list.

I followed approach....
In system call I do following,
local_bh_disable () ;
Operate on linked list () ;
local_bh_enable () ;

In the bottom half of device interrupt, I directly operate on 
linked list (without any locking) as this bottom half can not be 
interrupted by timer interrupt.

In the timer interrupt handler, I directly operate on linked list 
(without any locking) as this handler can not be interrupted by 
device interrupt bottom half.

Is this approach right or wrong? Please suggest me correct 
approach.

Thans and regards,
Dinesh

___________________________________________________

Download the hottest & happening ringtones here!

OR SMS: Top tone to 7333

Click here now: 
http://sms.rediff.com/cgi-bin/ringtone/ringhome.pl

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