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What should the "size" in "caml_alloc_custom" be?
-
lyn HONG
- Goswin von Brederlow
- Richard Jones
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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. MfG Goswin