[Stackless] advice on debugging stackless

[Simon Pickles]

> 3) Simplify design - i.e, for stuff like semaphores,
> use a simple channel and a counter, instead of say,
> multiple channels.
>
>   
My answer came through simplification. Instead of having a channel from 
A send an Event to B, and then B trying to send to A, I sent the Event 
from A to B through the channel with a callback as an argument

B then used this callback function object to pass the result of the 
event back to its originator directly.

Simpler and no loop. :)