GC Bug?

["Adam P. Jenkins" <ajenkins@cs.umass.edu>]

Adam P. Jenkins writes:
 > Hi, I've been trying to write a C extension for O'Caml version 1.05,
 > on Linux.  I have a C object which I want to be able to pass into
 > caml, and manipulate it with the C functions.  I'm having some
 > problems with allocation.  Here's the smallest example I can give.
 > I've even provided a Makefile, which creates a custom toplevel to test
 > this in.
 > 
 > The problem occurs in test_copy (see the C file below).   For my
 > abstract type, I just use two integers set to some magic values, which
 > should never change.  However, in copy, after I call alloc, sometimes
 > the input parameter will change.  Here's a sample session:
 > 

Hi, I'm following up to my own post because I figured out what the
problem was: I should have been saving the parameter in a root value
over the alloc call.  I guess it was getting relocated sometimes by
the GC.  

Sorry I can't post in French too; I only speak a da english.  Good
day.

Adam