From: "Török Edwin" <edwin+ml-ocaml@etorok.net>
To: caml-list@inria.fr
Subject: Re: [Caml-list] Segfault in C++ stub with many 'new' allocations
Date: Sat, 17 Nov 2012 21:10:48 +0200 [thread overview]
Message-ID: <50A7E138.9090601@etorok.net> (raw)
In-Reply-To: <0BEF3A04-3297-4084-BE4D-13ACCC4D431E@inria.fr>
On 11/17/2012 08:42 PM, Samuel Hornus wrote:
>
> On 17 nov. 2012, at 19:35, Kakadu wrote:
>
>> 2) AFAIR there are functions like register_global_root which prevents GC from moving values.
>
> Thank you Kakadu. It is interesting to know that one can use this function directly. I knew its existence only through the CAML[x]param* macros…
>
> Regarding my first question, if it can help, here is the relevant part of my C++ code:
> extern "C" value ann_create_bd_tree_flat_ba (value ba, value n, value dim)
> {
> CAMLparam3(ba,n,dim);
> ANNbd_tree * ptr = create_bd_tree_flat((ANNcoord*)Caml_ba_data_val(ba), Int_val(n), Int_val(dim));
> CAMLreturn ((value)ptr);
I don't think this is safe. Shouldn't the return value be wrapped in a custom block?
If the GC tries to interpret this as an OCaml value (which it isn't) it might crash.
--Edwin
next prev parent reply other threads:[~2012-11-17 19:10 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-11-17 18:29 Samuel Hornus
2012-11-17 18:35 ` Kakadu
2012-11-17 18:42 ` Samuel Hornus
2012-11-17 19:10 ` Török Edwin [this message]
2012-11-17 19:18 ` Samuel Hornus
2012-11-17 19:50 ` Markus Mottl
2012-11-17 19:46 ` Markus Mottl
2012-11-17 22:45 ` Samuel Hornus
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