Re: threads vs. greenlets (was Re: New stacklessproposal)

Mark Hahn wrote:

> I understand what you are saying now.  You want only co-routines on
> the Thread layer and functions like Sleep on the OSThread layer,
> correct?
>
> Do you included pre-emption as something that should be only on the
> OSThread layer?
>
> Now that I really understand what you are asking for I will give it
> some thought.
>
> Sleep could be avoided by the programmer just by not using it.  We
> could maybe make pre-emption a tuning parameter.  It could be turned
> on or off and the granularity could be fine-tuned.
>
> I'm going to stop this response here because we really have two
> different discussions going on.  One is threads vs. greenlets and the
> other is implementation.

Christian: You never responded to this.

Would it be ok to have pre-emption and sleep in the tasklets if we made the
pre-emption tunable by parameters in the ThreadMgr?  The user could turn off
pre-emption by setting the granularity to infinity and could avoid using
sleep().  This would give them the simple non-thread tasklets you want to
provide.

We could make this the default setting.  Calling sleep() with pre-emption
turned off could throw an exception.  So in the default case sleep would
throw an exception also.

If you agree with this then I think we finally agree on everything and I can
rewrite the proposal.