[Stackless] Re: [Python-Dev] Stackless Design Q. (original) (raw)

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 transfer.

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

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