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Re: [PATCH] add SRFI: srfi-121; generators

From: Linus Björnstam
Subject: Re: [PATCH] add SRFI: srfi-121; generators
Date: Tue, 26 Jan 2021 07:48:42 +0100
User-agent: Cyrus-JMAP/3.5.0-alpha0-78-g36b56e88ef-fm-20210120.001-g36b56e88

Hi Y'all!

I have an efficient, almost done implementation of srfi-121. I believe it lacks 
generator-unfold, but that is all. make-coroutine-generator is implemented 
using delimited continuations and runs a lot faster than the one in the 
reference implementation, with the caveat that it is apparently slightly 
incompatible: the coroutine generator usage in (srfi 146 hash) yielded the 
wrong result - despite my version passing all tests.

If the maintainers of guile are interested, I could clean this code up and add 
accumulators and make sure it conforms to the srfi document. 

I have already spent some time integrating srfi-171 into guile, so I'm not 
entirely unfamiliar with the task.

Best regards
  Linus Björnstam

On Tue, 26 Jan 2021, at 04:29, John Cowan wrote:
> Note that 121 is withdrawn, so people should implement 158.
> On Sat, Jan 23, 2021 at 1:38 AM Mark H Weaver <> wrote:
> > Hi Arthur,
> > 
> > "Arthur A. Gleckler" <> writes:
> > > It's not a bad idea for the sample implementation to be as clear as
> > > possible at the expense of performance.
> > 
> > I agree that it's desirable for one of the sample implementations to be
> > as simple and clear as possible, for the purpose of clarifying the
> > specification.
> > 
> > > But it certainly wouldn't hurt to have a supplemental document making
> > > recommendations about possible performance improvements, or even a
> > > second implementation.
> > 
> > Sounds good.  For SRFIs such as 121 and 158, where efficiency is
> > important, I think that a second sample implementation tuned for
> > performance would be a useful addition.
> > 
> >      Regards,
> >        Mark

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