From: Christian Neukirchen <chneukirchen@...>
Date: 2006-02-05T20:33:40+09:00
Subject: Re: Problem with weak references on OS X 10.3

Caleb Clausen <vikkous@gmail.com> writes:

> 100_000.times{|n|
>   o=Object.new;
>   i=o.__id__;
>   o2=ObjectSpace._id2ref(i);
>   o.equal? o2 or raise "o=#{o}, i=#{"%x"%i}, o2=#{o2.inspect}, n=#{n}"
> }
>
> The exception should never be raised. On my OS X 10.3.9 system (and at
> least 1 other) it does get eventually raised after a few hundred
> iterations using ruby 1.8 and 1.9. With the (apple-supplied) ruby 1.6,
> it does not happen. Tests on several Windows and Linux systems have
> never observed a problem, using ruby 1.8 and 1.9. I don't know if it's
> a problem on OS X 10.4; I don't have access to any 10.4 systems.
>
> The problem seems to be in the call to __id__. Usually, it works
> correctly, but every once in a while it returns the id of some random
> symbol. Does anyone know why this is happening?

I can reproduce on ruby 1.8.4 (2005-12-24) [powerpc-darwin7.9.0]:

o=#<Object:0x1d421c>, i=ea10e, o2=:reject, n=448 (RuntimeError)

It looks like the object id wrapped in some way and now points to a
symbol?  Clearly looks like a bug.

-- 
Christian Neukirchen  <chneukirchen@gmail.com>  http://chneukirchen.org