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Re: This week's summary

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Michael Joyce
December 26, 2003 00:25
Re: This week's summary
Message ID:
Thank you for a lovely Christmas Present.


On Dec 24, 2003, at 2:37 AM, The Perl 6 Summarizer wrote:

> The Perl 6 Summary for the week ending 20031221
>     Welcome one and all to the penultimate Perl 6 Summary for 2003. The
>     nights are long, the air is cold, freezing fog made the journey 
> home
>     from watching *The Return of the King* a deeply fraught experience
>     (though probably not as fraught for us as for the chap who 
> obviously
>     didn't see the roundabout in time and went straight over it).
>     If you're in the southern hemisphere, feel free to ignore the 
> foregoing
>     flavour text.
>     It should come as no surprise to you by now that we start with the
>     internals list.
>   Namespaces II
>     Dan returned from a bout of paying work to finish up the current
>     understanding of how namespaces are managed in Parrot. A namespace
>     selector becomes a multidimensional key (using a multidimensional 
> key
>     instead of a single long namespace name makes for easier sharing of
>     namespaces between languages; there's no need to go guessing what
>     separator the other language uses in its namespace naming because 
> that's
>     essentially irrelevant at the Parrot level). Looking up a 
> particular
>     variable in a namespace is still a two step process, first get the
>     namespace, then do the lookup within the namespace. Dan explained 
> that
>     this is a win because it should allow for holding onto namespaces 
> in a
>     register when dealing with multiple variables.
>     Leo Tötsch wasn't entirely convinced by the new syntax introduced, 
> and
>     proposed a mechanism which used the standard syntax for accessing
>     multikeyed structures with a proposed Namespace PMC.
>   Another keyed ops proposal
>     Leo continues to make proposals for rethinking keyed ops. Somewhat
>     surprisingly, Dan didn't entirely reject the latest one involving a
>     possible new set of key registers.
>   Leo adds threads
>     Leo Tötsch checked in a patch to allow Parrot to spawn threads. As 
> he
>     admitted, there's a lot missing, but it's a start. He solicited 
> comments
>     and further pointers.
>     Later in the week he asked for some design decisions related to 
> making
>     various of the interpreter's internal data structures thread safe.
>     Elizabeth Mattijsen had several comments to make, based on 
> experience
>     with Perl 5's ithread system. In essence her suggestion was that 
> as many
>     things as possible should be made copy on write between threads. 
> (I have
>     a faint recollection of Nicholas Clark delivering a wonderful 
> lightning
>     talk/dance explaining his proposal for making Perl 5 use copy on 
> write
>     structures for ithreads. It's worth seeing if you get the 
> chance...)
>   PDD03 and method calls
>     Leo queried the design of Parrot's calling conventions for calling 
> a
>     method and proposed a slightly different convention with the 
> object put
>     in P5 rather than P2. Dan thought that the calling conventions
>     documented was the right way to go, but didn't seem to convince
>     everyone.
>   Rolling back "clone"
>     Leo pointed out that "clone"'s semantics had got altered to take an
>     uninitialized destination PMC as an argument back when the GC 
> system was
>     flaky. He suggested switching back to a version that creates the 
> new PMC
>     itself now that GC was working properly. Dan told Leo to go for it.
> Meanwhile, in perl6-language
>     Um... sorry about this, but I'm punting on writing the promised
>     Roles/Traits/Classes summary. I was planning on doing it today, but
>     things have been hellish; I've spent about 8 hours fighting fires 
> today
>     rather than writing the summary. Sorry.
>     Work on Perl 6's object system continues apace though; things are
>     looking very good and powerful.
>     By the way from now on I'll try and stick to Larry's usage of
>     capitalizing 'Traits' when referring back to the Traits paper, and
>     keeping it lower case when referring to Perl 6's compile-time 
> traits.
>   Runtime CHECK?
>     Piers Cawley asked if Perl 6 modules that get loaded at runtime 
> will
>     have their "CHECK" blocks (or their equivalent) executed. Larry
>     initially thought not, but Rafael Garcia-Suarez noted that Perl 5
>     shouldn't be held up as exemplary and that there was definitely a 
> need
>     for some kind of special block that would get run at the end of the
>     compilation phase of any arbitrary compilation unit.
>   "but true"
>     Adam D. Lopresto wondered how the recent work on Roles, Properties 
> and
>     Traits fit in with already declared stuff like "but true". Larry
>     confessed that he was still thinking hard about this, but that he
>     thought "but" wasn't powerful enough yet.
> Acknowledgements, Announcements, Apologies
>     Cross your fingers and toes, we might have link shortening in this
>     version. Hurrah!
>     Merry Christmas everyone.
>     I make no promises about whether there will be a summary next 
> week. Nor
>     do I make any promises about whether there'll be a summary of the 
> year
>     (but I wouldn't hold your breath).
>     If you find these summaries useful or enjoyable, show your 
> appreciation
>     by contributing to the Perl Foundation to help support the ongoing
>     development of Perl. Money and time are both good. I'm always 
> pleased to
>     get feedback at and traffic at my website.
> -- The Perl Foundation
> -- My website, Just a Summary
Michael S. Joyce - all things in between

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