[Stackless] Re: [Python-Dev] Stackless Design Q.

Christian Tismer tismer@tismer.com
Thu, 21 Feb 2002 13:13:28 +0100

Greg Ewing wrote:

> Christian Tismer <tismer@tismer.com>:


>>But auto-scheduled frames are a diffeent kind
>>of thing than those which are in "waiting for data"
>>state. I need to distinguish them or I will crash.
> If you get rid of the idea of passing values between tasklets as part
> of the switching process, then this distinction disappears. I think
> that value-passing and tasklet-switching are orthogonal activities and
> would be better decoupled.

Hmm, first I thought you were wrong:

Any Python function that calls something, may it be a stackless
schedule function or something else, expects a value to
be returned. Always and ever.

But when I have a scheduler counter built into the Python
interpreter loop, then a schedule will happen *between*
opcodes. Such a frame is not awaiting data, and therefor
not suitable to be switched to by one which is in data

Now I see it: You mean I can make this schedule function behave
like a normal function call, that accepts and drops a dummy
value? In fact, this would make all tasklets compatible.

thinking - thanks - chris

Christian Tismer             :^)   <mailto:tismer@tismer.com>
Mission Impossible 5oftware  :     Have a break! Take a ride on Python's
Kaunstr. 26                  :    *Starship* http://starship.python.net/
14163 Berlin                 :     PGP key -> http://wwwkeys.pgp.net/
PGP Fingerprint       E182 71C7 1A9D 66E9 9D15  D3CC D4D7 93E2 1FAE F6DF
      where do you want to jump today?   http://www.stackless.com/