I'm trying to think of a simple example program for my tutorials. I'm stuck because I can't think of an example program that wouldn't involve video functions in seperate threads. So far I came up with this: For the semaphore tutorial I though of having the blitting function being protected with a binary semaphore and have two threads blitting a set of images on the screen. For the mutex/conditions tutorial I was thinking doing a classic producer/consumer dealie. On one side the producer shows its randomly produced set of images and on the other the consumer shows it's copy of the images. Yeah so any ideas you guys throw at me would be appreciated.

How about a ship that has different functions which run separately from each other: such as shields, guns, reload of guns, regeneration of shields, power output.

or something similar....?