Re: no constants please Richard Kelsey (04 Jan 2004 18:11 UTC)
Re: no constants please felix (04 Jan 2004 19:25 UTC)
Re: no constants please Richard Kelsey (04 Jan 2004 20:08 UTC)
Re: no constants please Tom Lord (04 Jan 2004 21:13 UTC)
Re: no constants please Tom Lord (04 Jan 2004 21:43 UTC)
Re: no constants please Richard Kelsey (04 Jan 2004 22:59 UTC)
Re: no constants please Tom Lord (05 Jan 2004 00:50 UTC)
Re: no constants please Tom Lord (05 Jan 2004 01:19 UTC)
Re: no constants please Richard Kelsey (05 Jan 2004 11:42 UTC)
Re: no constants please Tom Lord (05 Jan 2004 16:26 UTC)
Re: no constants please Richard Kelsey (05 Jan 2004 17:49 UTC)
Re: no constants please Tom Lord (05 Jan 2004 18:24 UTC)
Re: no constants please Michael Sperber (05 Jan 2004 18:48 UTC)
Re: no constants please Tom Lord (05 Jan 2004 22:00 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 00:55 UTC)
Re: I don't believe in "(may GC)" Richard Kelsey (05 Jan 2004 12:07 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 16:35 UTC)
Re: I don't believe in "(may GC)" bear (05 Jan 2004 17:54 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 01:05 UTC)
Re: no constants please Tom Lord (05 Jan 2004 01:12 UTC)
Re: no constants please Richard Kelsey (05 Jan 2004 12:17 UTC)
Re: no constants please Tom Lord (05 Jan 2004 17:40 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 02:15 UTC)
Re: no constants please Tom Lord (06 Jan 2004 02:29 UTC)
Re: no constants please tb@xxxxxx (06 Jan 2004 02:31 UTC)
Re: no constants please Richard Kelsey (06 Jan 2004 03:10 UTC)
Re: no constants please tb@xxxxxx (06 Jan 2004 03:14 UTC)
Re: no constants please Tom Lord (06 Jan 2004 04:06 UTC)

I don't believe in "(may GC)" Tom Lord 05 Jan 2004 01:21 UTC


The draft FFI says:

    double SCHEME_EXTRACT_DOUBLE(scheme_value)
    char * SCHEME_EXTRACT_STRING(scheme_value)

Neither says "(may GC)".

I don't like that.

If I'm using some exotic number representation (constructive reals,
perhaps), then EXTRACT_DOUBLE may very well involve some pretty hairy,
hence possibly GC-causing, computation.

If I'm using some exotic string representations (I'm working on a
functional-splay-tree string type for Pika) -- same deal:
extract-string may take some (possibly GC-causing) work.

Even something innocent like:

     int SCHEME_CHAR_P(scheme_value)

can cause GC if my implementation let's me attach to a hook in its
implementation.

In short, even if you are going to be stubborn about concurrent
threads or async execution an insist that GC can only happen "at
certain times" -- I'm not convinced that there is a single entry point
anywhere in the FFI which does not qualify for "(may GC)".

-t