From: Guillaume Cottenceau <gcottenc@...>
Date: 2005-04-13T16:28:27+09:00
Subject: Re: ability to run finalizers at a given point of a program?

> So, I am getting the same result ts was getting.

Now that is strange.. :/
 
> > What difference do you pretend your program is making with mine?
> 
> The difference is in this:
> 
> (your version):
> def scopeme
>     foo = Foo.new
>     ObjectSpace.define_finalizer(foo, proc { puts "*** pseudo-destructor" })
> end
> 
> That block captures foo as well. As a result, that instance will never
> be unreferenced, and thus never going to be GC'ed until the program
> ends.
> 
> OTOH, ts' version:
> class Foo
>    def self.final
>       proc { puts "*** pseudo-destructor" }
>    end
> end
> 
> def scopeme
>    foo = Foo.new
>    ObjectSpace.define_finalizer(foo, Foo.final)
> end
> 
> Notice that the finalizer block does not capture the Foo instance.

Wait.. both calls to define_finalizer have a reference to foo as the
first argument, and both have a closure as second argument which
doesn't have a reference to foo.

I fear I just fell into a parallel universe..

--
Guillaume Cottenceau - http://zarb.org/~gc/