Linux Device Drivers Programming

Refer link

http://www.thegeekstuff.com/2012/02/rtos-basics/
http://www.circuitstoday.com/gpos-versus-rtos-for-an-embedded-system
http://www.embedded.com/design/operating-systems/4371651/Comparing-the-real-time-scheduling-policies-of-the-Linux-kernel-and-an-RTOS-

http://www.linuxprogrammingblog.com/all-about-linux-signals?page=8