[Stackless] Interruptable wait aka Receive with Timeout

[Christian Tismer]

On 4/17/10 4:34 PM, Andrew Tutt wrote:
> This idiom has probably already been contributed, but the following 
> code implements "interruptable wait" which could also be thought of 
> the opposite way, as implementing receive() with a timeout.
>
> Also, I've taken the liberty on the following code of actually using a 
> small sleep call between schedules. This, I have found massively 
> decreases CPU load while altering my performance very little. Your 
> results may vary, but as you may already be aware, there is no way 
> that I can think of that one can implement sleep that is not busy in 
> stackless, so this is the next best thing. You could easily extend it 
> to make it tweak the length of the time.sleep based on load of course.
Without looking at the code now, who says that a non-busy sleep
cannot be implemented? Make a timer class with a singleton
instance that keeps track of all sleepers. As soon as all
but one tasklets are sleeping, the last tasklet can compute
the time until one will wake up, and really sleep for that period.

ciao - chris

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