RE: [Caml-list] allocating memory for c-structures

["EL CHAAR Rabih SGAM/AI/SAM" <RABIH.ELCHAAR@sgam.com>]

The issue about having c structures allocated in ocaml heap is about:
1) having a floating pointer that could be displaced by the gc during its cycles (if it is emedded into ocaml heap)
2) having it reside in the c heap, and not be impacted by caml gc cycles (this can be justified if the c structure is heavy in memory, like a c array, ...): this is done by creating caml values with a custom or abstract tag.
3) memory freeing could always be done to a custom_tag value through the finalization function passed during the creation.

Hope this helps,
Rabih


-----Message d'origine-----
De : caml-list-bounces@yquem.inria.fr [mailto:caml-list-bounces@yquem.inria.fr] De la part de micha
Envoyé : mardi 26 décembre 2006 19:16
À : OCaml Mailing List
Objet : [Caml-list] allocating memory for c-structures

Normaly I allocate memory for c-structures with malloc or with "new" for 
c++ objects. Some time ago a read about a library which places external 
structures in strings of the interfacing languages (it was a scheme lib 
I think). So instead of using malloc or new I would allocate an 
ocaml-string and put the c-structure there. So it will be free by the gc.
That seems o.k. for me, any comments? I'm missing something?

cheers
 Michael

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