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Re: [Caml-list] caml_oldify_local_roots crashes
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Date: 2005-01-02 (20:34)
From: Zakath <haiku.issa@l...>
Subject: Re: [Caml-list] caml_oldify_local_roots crashes
> On Sun, Dec 26, 2004 at 04:35:53AM +0000, Jon Harrop wrote:
> > On Sat, 25 Dec 2004, haiku.issa wrote:
> > > Everything worked fine until I added a subfunction that simply
> > > merges two int lists.
> > I am no expert on this but I believe this implies that your interfacing 
> > between C and OCaml was already broken. Almost certainly something to do 
> > with the GC.

> It often helps to add lots of calls to Gc.full_major () to your code.
> One of these will crash, telling you that between that call and the
> previous one, you did something bad to the heap.
> Rich.

I eventually found out : I was following the book "Devloppement d'applications avec Objective Caml" instead of the OCaml manual. They were advicing to register local variables and parameters (with CAMLparam* and CAMLlocal*) when using a callback.
Removing them made everything work fine.

To be more accurate, it was creating a corrupted entry of local_roots. from /asmrun/roots.c (or byterun), there was (lr->next == lr) in some point, which was causing the looping.
May be this should be said in the Manual ?

Thnaks for your help