Multithreaded Game Engine Architectures:
http://www.gamasutra.com/features/20060906/monkkonen_01.shtml
Threading 3D Game Engine Basics:
http://www.gamasutra.com/features/20051117/gabb_01.shtml
POSIX Threads Programming (good article to get understanding what thread is):
https://computing.llnl.gov/tutorials/pthreads/
