I have a simple driver in Vxworks ( lets say in a flat memory RTOS) What I do is whenever my ISR detects any H/W intr it posts a message to a task T1. T 1 does the processing and then notifies the application task T2. How do I do the same in linux?? Is it possible at all. Regards Nilanjan -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/