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Re: Some comments

This page is part of the web mail archives of SRFI 39 from before July 7th, 2015. The new archives for SRFI 39 contain all messages, not just those from before July 7th, 2015.

At Mon, 30 Dec 2002 09:29:22 -0500, Marc Feeley wrote:
> No "copy-on-write" is not a valid implementation.  The reason is that
> the "swapping" semantics requires the child thread to have an
> independent copy of the parent's thread.  So the child must get a
> snapshot of the parent's dynamic environment which will make the
> child's mutations invisible to the parent ***AND*** the parent's
> mutations invisible to the child.  The copy-on-write approach you
> suggest only makes the child's mutations invisible to the parent.

Depends on what you mean by "copy on write". I'd say that MzScheme uses
"copy on write", and I mean that a copy is made whenever the parent or
child changes a parameter value. (I think that's consistent with
Felix's suggestion.)