From: Marek Kubica <marek@xivilization.net>
To: Caml List <caml-list@inria.fr>
Subject: [Caml-list] OCaml C macros, what do they do?
Date: Wed, 10 Apr 2013 18:15:26 +0200 [thread overview]
Message-ID: <20130410181526.2597c7a4@xivilization.net> (raw)
Hi,
I've been using the OCaml C API lately with quite some success (after I
realized that the GC causes everything to crash and fixing a lot of
stuff).
While things work now quite well, I'd like to know what *exactly* the
macros are for, since sometimes I can leave them out without any ill
effect.
So, here's my insights. If anyone of you could point out what is
correct and what is not, I'd be grateful:
- CAMLparam1(foo), notifies the GC that foo is used in this function
and not to be collected.
- CAMLlocal1(foo), creates a local variable foo. This is only required
if I want to bind some "value" type to a variable name. Not required
if I immediately return it.
- CAMLreturn(foo) returns a foo value and tells the GC that everything
declared by CAMLparam will not be used anymore and could be
collected.
- CAMLprim defines a function as "primitive" according to the
documentation. I have no idea what that means. The example in the
manual, section 19.6 does not use CAMLprim to start with.
regards,
Marek
next reply other threads:[~2013-04-10 16:15 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-04-10 16:15 Marek Kubica [this message]
2013-04-10 17:05 ` Alain Frisch
2013-04-10 21:04 ` Marek Kubica
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