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Date: | 2010-01-09 (00:11) |
From: | Guillaume Yziquel <guillaume.yziquel@c...> |
Subject: | Re: [Caml-list] problem creating .cma library |
Basile STARYNKEVITCH a écrit : >> >> Why do these functions not follow the usual CAMLparam/CAMLreturn macro >> stuff? > > Because they are written by the Ocaml guys (Damien knows really well the > Ocaml garbage collector; he wrote it). And also, because these > particular functions do not do any allocation of Ocaml values (either > directly or indirectly). So, no allocation of OCaml values (or in place modification, either, I guess) implies no need for CAMLparam/CAMLreturn stuff? > My advice for people coding C code for ocaml is the following: > > 1. *always* use the CAMLparam/CAMLreturn/... macros. > > 2. if you dare not using them for some very few functions (because they > don't allocate, ...) add a big fat comment with a warning inside. > > Regards I want to understand them so that I can abstract away in some other file / .so, some rather usual constructs involving OCaml structures. I think it is smarter to take some time doing this, with detailed comments all over, than repeating the same mistakes over and over (or worse: wondering if you made mistakes) when doing C bindings. All the best, -- Guillaume Yziquel http://yziquel.homelinux.org/