From: Robert Klemme <shortcutter@...>
Date: 2007-01-18T06:55:53+09:00
Subject: Re: ObjectSpace.define_finalizer does not run some procedure structures

On 17.01.2007 22:00, paul.denize@datacom.co.nz wrote:
> I have Ruby 182-15 on WinXP
> 
> When I run the code below only the first finalizer runs.  The others
> two don't seem to run.  I found similar posts on other sites, but no
> solutions.
> 
> You can duplicate the first and it runs twice (so two finalizers is
> ok).
> 
> To me they are all somewhat identical.  Can anyone tell me why it does
> not work.
> 
> I have a number of machines that run testware in ruby 152 so I'd like
> to KNOW that upgrading will fix the problem before taking this path.
> 
> 
> Paul
> 
> ------- Test.rb --------
> 
> class MyClass
> 
>     def initialize
> 
> ObjectSpace.define_finalizer(self,self.class.method(:finalize).to_proc)
>        ObjectSpace.define_finalizer(self,proc{|id| puts "proc final
> #{id}"})
>        ObjectSpace.define_finalizer(self,self.dofinalize)
>     end
> 
>     def self.finalize(id)
>         puts "Object #{id} dying at #{Time.new}"
>     end
> 
>     def self.f2(id)
>         puts "F2 #{id}"
>     end
> 
>     def dofinalize
>       return Proc.new { |param|
>         puts "Doing finalize #{param[0]}"
>       }
>     end
> end
> 
> 
> MyClass.new
> ObjectSpace.garbage_collect
> 
> puts "DONE"
> 
> -------- output -------
> 
>> Test.rb
> DONE
> Object 20691624 dying at Thu Jan 18 09:55:38 New Zealand Standard Time
> 2007
> 

There's a subtle difference between the first and the other two: the 
first one does not create a closure which binds "self" to the current 
instance.  That might be an explanation.

Kind regards

	robert