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Re: fixes to goops + light structs + 'u' slots

From: Andy Wingo
Subject: Re: fixes to goops + light structs + 'u' slots
Date: Sat, 19 Apr 2008 18:28:10 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/23.0.60 (gnu/linux)

Hi Mikael,

On Tue 15 Apr 2008 00:16, "Mikael Djurfeldt" <address@hidden> writes:

> 2008/4/14, Andy Wingo <address@hidden>:
>> Regarding memory consumption. Currently, structs are double-cells: one
>>  word for the vtable, one for the data, one empty, and one for the
>>  "STRUCT_GC_CHAIN", used (please correct me) during GC to ensure that
>>  structs are freed before their vtables.
> I wash my hands.  :-)  When I left, structs where two words.

commit 08c880a36746289330f3722522960ea21fe4ddc8
Author: Mikael Djurfeldt <address@hidden>
Date:   Wed Aug 9 18:29:31 2000 +0000

    * struct.c (scm_make_struct, scm_make_vtable_vtable): Structs
    handles are now double cells; Initialize SCM_STRUCT_GC_CHAIN to
    (scm_struct_gc_init, scm_free_structs): New GC C hooks.
    (scm_struct_prehistory): Install them.

It is natural for our memory to fade over this much time ;-)

But if at any point something sparks in your brain to figure out a way
around the GC chain, I'd certainly be interested. Otherwise we could put
that empty third word to good use.


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