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?? abbrev.rb(2.5 KB)
?? base64.rb(3.37 KB)
?? benchmark.rb(17.73 KB)
?? bigdecimal
?? cgi
?? cgi-lib.rb(6.89 KB)
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?? complex.rb(12.84 KB)
?? csv.rb(24.46 KB)
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?? debug.rb(20.61 KB)
?? delegate.rb(8.81 KB)
?? digest
?? digest.rb(1.12 KB)
?? dl
?? drb
?? drb.rb(19 B)
?? e2mmap.rb(4.04 KB)
?? erb.rb(21.38 KB)
?? eregex.rb(487 B)
?? expect.rb(633 B)
?? fileutils.rb(42.23 KB)
?? finalize.rb(5.38 KB)
?? find.rb(1.84 KB)
?? forwardable.rb(6.16 KB)
?? ftools.rb(6.17 KB)
?? generator.rb(8.1 KB)
?? getoptlong.rb(14.88 KB)
?? getopts.rb(2.25 KB)
?? gserver.rb(6.43 KB)
?? importenv.rb(590 B)
?? io
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?? irb
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?? kconv.rb(8.12 KB)
?? logger.rb(17.59 KB)
?? mailread.rb(1.28 KB)
?? mathn.rb(5.42 KB)
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?? md5.rb(411 B)
?? mkmf.rb(50.65 KB)
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?? observer.rb(5.15 KB)
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?? openssl
?? openssl.rb(575 B)
?? optparse
?? optparse.rb(47.12 KB)
?? ostruct.rb(3.35 KB)
?? parsearg.rb(1.55 KB)
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?? pathname.rb(29.39 KB)
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?? profile.rb(90 B)
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?? rational.rb(12.05 KB)
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?? resolv.rb(56.83 KB)
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?? rss.rb(504 B)
?? rubyunit.rb(180 B)
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?? scanf.rb(20.63 KB)
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?? thread.rb(104 B)
?? thwait.rb(4.32 KB)
?? time.rb(31.58 KB)
?? timeout.rb(3 KB)
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?? tracer.rb(2.73 KB)
?? tsort.rb(7.99 KB)
?? un.rb(4.54 KB)
?? uri
?? uri.rb(710 B)
?? weakref.rb(2.68 KB)
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?? webrick.rb(811 B)
?? wsdl
?? x86_64-linux
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?? yaml
?? yaml.rb(12.36 KB)

Editing: weakref.rb

require "delegate"

# WeakRef is a class to represent a reference to an object that is not seen by
# the tracing phase of the garbage collector.  This allows the referenced
# object to be garbage collected as if nothing is referring to it. Because
# WeakRef delegates method calls to the referenced object, it may be used in
# place of that object, i.e. it is of the same duck type.
#
# Usage:
#
#   foo = Object.new
#   foo = Object.new
#   p foo.to_s			# original's class
#   foo = WeakRef.new(foo)
#   p foo.to_s			# should be same class
#   ObjectSpace.garbage_collect
#   p foo.to_s			# should raise exception (recycled)
class WeakRef<Delegator

# RefError is raised if an object cannot be referenced by a WeakRef.
  class RefError<StandardError
  end

@@id_map =  {}                # obj -> [ref,...]
  @@id_rev_map =  {}            # ref -> obj
  @@final = lambda{|id|
    __old_status = Thread.critical
    Thread.critical = true
    begin
      rids = @@id_map[id]
      if rids
	for rid in rids
	  @@id_rev_map.delete(rid)
	end
	@@id_map.delete(id)
      end
      rid = @@id_rev_map[id]
      if rid
	@@id_rev_map.delete(id)
	@@id_map[rid].delete(id)
	@@id_map.delete(rid) if @@id_map[rid].empty?
      end
    ensure
      Thread.critical = __old_status
    end
  }

# Create a new WeakRef from +orig+.
  def initialize(orig)
    super
    __setobj__(orig)
  end

# Return the object this WeakRef references. Raises RefError if the object
  # has been garbage collected.  The object returned is the object to which
  # method calls are delegated (see Delegator).
  def __getobj__
    unless @@id_rev_map[self.__id__] == @__id
      raise RefError, "Illegal Reference - probably recycled", caller(2)
    end
    begin
      ObjectSpace._id2ref(@__id)
    rescue RangeError
      raise RefError, "Illegal Reference - probably recycled", caller(2)
    end
  end

def __setobj__(obj)
    @__id = obj.__id__
    __old_status = Thread.critical
    begin
      Thread.critical = true
      unless @@id_rev_map.key?(self)
        ObjectSpace.define_finalizer obj, @@final
        ObjectSpace.define_finalizer self, @@final
      end
      @@id_map[@__id] = [] unless @@id_map[@__id]
    ensure
      Thread.critical = __old_status
    end
    @@id_map[@__id].push self.__id__
    @@id_rev_map[self.__id__] = @__id
  end

# Returns true if the referenced object still exists, and false if it has
  # been garbage collected.
  def weakref_alive?
    @@id_rev_map[self.__id__] == @__id
  end
end

if __FILE__ == $0
  require 'thread'
  foo = Object.new
  p foo.to_s			# original's class
  foo = WeakRef.new(foo)
  p foo.to_s			# should be same class
  ObjectSpace.garbage_collect
  p foo.to_s			# should raise exception (recycled)
end

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Editing: weakref.rb

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