Coroutine not working correctly

I have this code:
http://pastebin.com/BLF2grca
And the time updates just fine, but my mouse events do not work. The coroutine is starting successfully, as it returns true. What is happening?

You resumed it once, but then you never resume it again. You should read through the coroutine handling in the parallel API, to get a better idea of what coroutine management entails.

Lyqyd, on 21 December 2014 - 11:09 PM said:

You resumed it once, but then you never resume it again. You should read through the coroutine handling in the parallel API, to get a better idea of what coroutine management entails.

Okay. I know that os.pullEventRaw() calls a yeild, but how would I go about making this work?