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What should the "size" in "caml_alloc_custom" be?
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Date: 2010-05-18 (06:57)
From: Goswin von Brederlow <goswin-v-b@w...>
Subject: Re: [Caml-list] What should the "size" in "caml_alloc_custom" be?
lyn HONG <lynxiamen@gmail.com> writes:

> Hi all,
> I have a question about "allocating custom blocks" in "iterfacing C with object
> Ocaml". when we call function "caml_alloc_custom(ops, size, used, max)" in the
> C side, if the structure we want to allocate has a pointer, is the "size" 
> going to be size of the structure itself only, or should we also include the
> memory block that pointer points to?
> Thanks,
> Lin

The size is the number of ocaml words in the structure itself. The
pointer then points outside the ocaml heap to some C memory allocated by
malloc(). You should account for that size in the used/max pair.