From: ts <decoux@...>
Date: 2005-04-13T17:11:21+09:00
Subject: Re: ability to run finalizers at a given point of a program?

>>>>> "G" == Guillaume Cottenceau <gcottenc@gmail.com> writes:

G> What version of Ruby are you running? With your example I can see:

 1.8.2

svg% cat b.rb
#!/usr/local/bin/ruby -v
class Foo
   def initialize
      puts "*** constructor"
   end
   def self.final
      proc { puts "*** pseudo-destructor" }
   end
end

def scopeme
   foo = Foo.new
   ObjectSpace.define_finalizer(foo, Foo.final)
end

a = scopeme
puts "Foo was out-scoped."

GC.start
puts "Gc was run."
svg% 

svg% b.rb
ruby 1.8.2 (2004-12-25) [i686-linux]
*** constructor
Foo was out-scoped.
*** pseudo-destructor
Gc was run.
svg% 


G> What difference do you pretend your program is making with mine?

 closure + assignement

svg% diff -u b.rb~ b.rb
--- b.rb~       2005-04-13 10:08:15.000000000 +0200
+++ b.rb        2005-04-13 10:08:40.000000000 +0200
@@ -13,7 +13,7 @@
    ObjectSpace.define_finalizer(foo, Foo.final)
 end
 
-a = scopeme
+scopeme
 puts "Foo was out-scoped."
 
 GC.start
svg%
 
svg% b.rb
ruby 1.8.2 (2004-12-25) [i686-linux]
*** constructor
Foo was out-scoped.
Gc was run.
*** pseudo-destructor
svg% 


 the GC is conservative.



Guy Decoux