a simple example of Stackless Python
junaftnoon at nospamplzyahoo.com
Tue Oct 31 04:16:24 CET 2000
"Evan Simpson" <evan at 4-am.com> wrote in message
news:V7oL5.37775$f01.44754 at skycache.prestige.net...
> "June Kim" <junaftnoon at nospamplzyahoo.com> wrote in message
> news:8tjrn2$esm$1 at news.nuri.net...
> > It seems like there are few people who understand Stackless Python
> > and the stuffs, and I'm not one of them. Can anyone explain me
> > this simple code? The paper was not very helpful for me to understand.
> I'll give it a shot. "this = continuation.current()" creates a
> object, and "this.update(n)" does two things: First, it updates the
> continuation object so that calling it will cause program execution to
> continue at that line, as though "this.update(n)" had just returned the
> value passed in the call. Second, it evaluates to n, so that the line
> as though it were "k = n".
> Thus, "this(k-1)" jumps to the "k = this.update(n)" line and makes it act
> as though it were "k = k-1". It means "continue at the point just after
> were updated, with k-1 on top of the stack".
> The whole function behaves exactly like:
> k = n
> while k:
> k = k-1
> ...and demonstrates how a continuation can be used to construct a simple
Thank you first of all.
If my understanding is right, what cotinuation objects save is not the
whole context including variables but only the point of execution.
Am I right on this?
> Evan @ digicool & 4-am
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