From: Robert Dober <robert.dober@...>
Date: 2008-01-11T07:56:17+09:00
Subject: Re: why does this code leak?

On Jan 10, 2008 11:09 PM, Rick DeNatale <rick.denatale@gmail.com> wrote:
Thanks for your time Rick.
I have just written lots of testcode and there is no need to post it,
it is clear self is captured in the closure. ( Probably very useful
too ).
This happens for 1.9 too, so why did we get the following

class Foo
 def initialize
      creation_time = Time.now
     ObjectSpace.define_finalizer self, lambda{ puts "An Object has
died (#{creation_time}-#(Time.now}) R.I.P."
  end

end

I guess the finalizer is not used and thus the lambda thrown away:

682/183 > cat leak.rb && ruby1.9 leak.rb
# vim: sw=2 ts=2 ft=ruby expandtab tw=0 nu syn:
#

Foo = Class::new{
  def initialize
    ObjectSpace.define_finalizer self, lambda {p :finalized}
  end
}

(42/7).times {
  Foo.new
  GC.start
  p "Foo" => ObjectSpace.each_object(Foo){}
}
{"Foo"=>1}
{"Foo"=>1}
{"Foo"=>1}
{"Foo"=>1}
{"Foo"=>1}
{"Foo"=>1}

Bingo!!!
Robert
---
Whereof one cannot speak, thereof one must be silent.
Ludwig Wittgenstein