Hi, Once I call wait_event_interruptible, is it important to call wake_up_interruptible sometime later. wait_even_interruptible would automatically awaken the sleeping process when the condition it takes as an argument evaluates to TRUE, so in which specific cases do we require a separate wake_up_interruptible. ? thanks Amit -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/