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(Previous discussion continued)
Re: no constants please Richard Kelsey (04 Jan 2004 18:09 UTC)
Re: no constants please felix (04 Jan 2004 19:28 UTC)
Re: no constants please Richard Kelsey (04 Jan 2004 20:06 UTC)
Re: no constants please Tom Lord (04 Jan 2004 21:39 UTC)
Re: no constants please Tom Lord (04 Jan 2004 22:09 UTC)
Re: no constants please Richard Kelsey (04 Jan 2004 22:58 UTC)
Re: no constants please Tom Lord (05 Jan 2004 01:16 UTC)
Re: no constants please Tom Lord (05 Jan 2004 01:45 UTC)
Re: no constants please Richard Kelsey (05 Jan 2004 11:40 UTC)
Re: no constants please Tom Lord (05 Jan 2004 16:51 UTC)
Re: no constants please Richard Kelsey (05 Jan 2004 17:48 UTC)
Re: no constants please Tom Lord (05 Jan 2004 18:50 UTC)
Re: no constants please Michael Sperber (05 Jan 2004 18:48 UTC)
Re: no constants please Tom Lord (05 Jan 2004 22:26 UTC)
Re: no constants please Michael Sperber (06 Jan 2004 07:42 UTC)
I don't believe in "(may GC)" Tom Lord (05 Jan 2004 01:21 UTC)
Re: I don't believe in "(may GC)" Richard Kelsey (05 Jan 2004 12:06 UTC)
Re: I don't believe in "(may GC)" Shiro Kawai (05 Jan 2004 12:45 UTC)
Re: I don't believe in "(may GC)" bear (05 Jan 2004 18:16 UTC)
Re: I don't believe in "(may GC)" Tom Lord (05 Jan 2004 17:00 UTC)
Re: I don't believe in "(may GC)" bear (05 Jan 2004 17:53 UTC)
Re: I don't believe in "(may GC)" tb@xxxxxx (06 Jan 2004 01:39 UTC)
Re: I don't believe in "(may GC)" Michael Sperber (06 Jan 2004 07:39 UTC)
Re: no constants please Tom Lord (05 Jan 2004 01:31 UTC)
Re: no constants please Tom Lord (05 Jan 2004 01:38 UTC)
Re: no constants please Richard Kelsey (05 Jan 2004 12:16 UTC)
Re: no constants please Tom Lord (05 Jan 2004 18:05 UTC)
Re: no constants please Michael Sperber (05 Jan 2004 19:03 UTC)
Re: no constants please tb@xxxxxx (06 Jan 2004 01:37 UTC)
Re: no constants please Richard Kelsey (06 Jan 2004 02:14 UTC)
Re: no constants please Tom Lord (06 Jan 2004 02:55 UTC)
Re: no constants please tb@xxxxxx (06 Jan 2004 02:31 UTC)
Re: no constants please Richard Kelsey (06 Jan 2004 03:09 UTC)
Re: no constants please tb@xxxxxx (06 Jan 2004 03:14 UTC)
Re: no constants please Tom Lord (06 Jan 2004 04:32 UTC)

Re: no constants please Michael Sperber 05 Jan 2004 18:48 UTC

>>>>> "Tom" == Tom Lord <xxxxxx@emf.net> writes:

Tom> If the root set is large, certainly it should be traced in several
Tom> steps, using barriers to preserve its invariants.

Is there a practical example of a system that does this?  It seems
very difficult to do, even absent an FFI to C, as your typical root
set---the current continuation---changes *all the time*.  (I'm really
curious.  I could never wrap my mind around this.)

In 1997, I developed the prototype for this FFI concurrently with
hooking RScheme's incremental collector into Scheme 48, so there's
some evidence that the FFI works with incremental collection in
principle.

Tom> Absent any further guidance from the FFI spec, I would expect some
Tom> programs to register a very large number of locations -- and worse,
Tom> locations scattered widely in memory -- using
Tom> SCHEME_GC_PROTECT_GLOBAL.  (Why wouldn't I, in a printed circuit board
Tom> CAD program, GCPROtect a field of every C structure representing an
Tom> edge in a netlist graph?)

Because of what you just said? :-)

--
Cheers =8-} Mike
Friede, Völkerverständigung und überhaupt blabla