On Wed, 22 Jun 2005, Vishwas Manral wrote: > I have Googled and gone through a lot of links and as well as browsed > through the Linux code but could not figure this one out. I wanted to > know if we could take semaphores in timer routine - bottom-half context > (I guess not). What mechanism (softirq, tasklets, etc) can be used if we > want to use semaphores? Any links would be of great help. The only thing you can use to synchronize softirqs and tasklets are enabling and disabling processing the bottom halves on the current processor completely (local_bih_disable() and local_bh_enable()). However, you can use conventional locking mechanisms when you are using workqueues, as they are run in process context and therefore they can be safely rescheduled. -- JiKos. -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
