About Real time System
What are the topics u have to cover there?
You can go through one book on real time system, author is "Quing Li", that is a very good book. Beside that you can go through some embedded system books for implementation purpose of real time system.
To know about Real timesystem you can go through various emebedded books posted here. One such book is O reilly book on Embedded system. Other one is Michael J Ponts book on Embedded system. If you need those books you can tell me. I can provide you.