Re: [Caml-list] caml_oldify_local_roots takes 50% of the total runtime

["Markus Mottl" <markus.mottl@gmail.com>]

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On 10/26/06, Hendrik Tews <H.Tews@cs.ru.nl> wrote:
>
> I don't quite understand: I only have pointers from C++ to ocaml.
> Once constructed the ocaml objects are completely independent
> from the C++ ones.
>

Ok, I thought they were entangled, i.e. there were pointers in both
directions.  But you will still need to avoid storing OCaml-values in
C++-values.

If you want to prevent them from being reclaimed as long as the C++-objects
still refer to them, you'll have to store them in e.g. an OCaml-hashtable
using e.g. integer keys as handles.  Then you can store the key in the
C++-object as an ordinary C++-value (i.e. no registering with the GC).  If
you need the OCaml-value on the C++-side, you just convert the handle to an
OCaml-value, and execute a callback to look up the value associated with the
handle in the hashtable.  Btw., if you use an OCaml-int as handle you can
store the "value" directly, because ints need not be registered with the GC
anyway.

Regards,
Markus

-- 
Markus Mottl        http://www.ocaml.info        markus.mottl@gmail.com

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