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PATH: opt / alt / ruby19 / lib64 / ruby / 1.9.1

require "delegate"
require 'thread'

# Weak Reference class that allows a referenced object to be
# garbage-collected.  A WeakRef may be used exactly like the object it
# references.
#
# 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 when a referenced object has been recycled by the
  # garbage collector

class RefError < StandardError
  end

@@id_map =  {}                # obj -> [ref,...]
  @@id_rev_map =  {}            # ref -> obj
  @@mutex = Mutex.new
  @@final = lambda {|id|
    @@mutex.synchronize {
      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
    }
  }

##
  # Creates a weak reference to +orig+

def initialize(orig)
    @__id = orig.object_id
    ObjectSpace.define_finalizer orig, @@final
    ObjectSpace.define_finalizer self, @@final
    @@mutex.synchronize {
      @@id_map[@__id] = [] unless @@id_map[@__id]
    }
    @@id_map[@__id].push self.object_id
    @@id_rev_map[self.object_id] = @__id
    super
  end

def __getobj__ # :nodoc:
    unless @@id_rev_map[self.object_id] == @__id
      Kernel::raise RefError, "Invalid Reference - probably recycled", Kernel::caller(2)
    end
    begin
      ObjectSpace._id2ref(@__id)
    rescue RangeError
      Kernel::raise RefError, "Invalid Reference - probably recycled", Kernel::caller(2)
    end
  end

def __setobj__(obj) # :nodoc:
  end

##
  # Returns true if the referenced object is still alive.

def weakref_alive?
    @@id_rev_map[self.object_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
  ObjectSpace.garbage_collect
  p foo.to_s                    # should raise exception (recycled)
end

[+] rinda
[+] yaml
[-] rational.rb [edit]
[-] matrix.rb [edit]
[+] rdoc
[-] shell.rb [edit]
[-] ostruct.rb [edit]
[-] scanf.rb [edit]
[+] ripper
[+] dl
[-] gserver.rb [edit]
[-] rdoc.rb [edit]
[-] getoptlong.rb [edit]
[-] thread.rb [edit]
[-] sync.rb [edit]
[+] syck
[-] delegate.rb [edit]
[-] open-uri.rb [edit]
[-] json.rb [edit]
[-] rubygems.rb [edit]
[-] openssl.rb [edit]
[+] json
[-] debug.rb [edit]
[+] irb
[-] digest.rb [edit]
[-] yaml.rb [edit]
[-] forwardable.rb [edit]
[-] weakref.rb [edit]
[-] benchmark.rb [edit]
[-] profiler.rb [edit]
[-] uri.rb [edit]
[-] English.rb [edit]
[-] timeout.rb [edit]
[+] rbconfig
[-] tracer.rb [edit]
[-] resolv.rb [edit]
[+] uri
[-] tsort.rb [edit]
[-] find.rb [edit]
[-] logger.rb [edit]
[-] psych.rb [edit]
[+] psych
[-] ubygems.rb [edit]
[-] profile.rb [edit]
[-] optparse.rb [edit]
[+] matrix
[-] pp.rb [edit]
[+] test
[-] date.rb [edit]
[-] cmath.rb [edit]
[-] ripper.rb [edit]
[-] fiddle.rb [edit]
[+] drb
[+] rake
[+] webrick
[-] cgi.rb [edit]
[-] pathname.rb [edit]
[+] xmlrpc
[-] mutex_m.rb [edit]
[+] rss
[+] racc
[-] complex.rb [edit]
[+] ..
[-] prettyprint.rb [edit]
[-] csv.rb [edit]
[-] kconv.rb [edit]
[-] securerandom.rb [edit]
[+] fiddle
[-] abbrev.rb [edit]
[-] resolv-replace.rb [edit]
[+] digest
[-] mathn.rb [edit]
[+] rexml
[-] e2mmap.rb [edit]
[-] shellwords.rb [edit]
[-] rss.rb [edit]
[-] time.rb [edit]
[+] openssl
[+] date
[-] dl.rb [edit]
[-] fileutils.rb [edit]
[-] socket.rb [edit]
[+] net
[-] monitor.rb [edit]
[-] tempfile.rb [edit]
[-] syck.rb [edit]
[-] un.rb [edit]
[-] mkmf.rb [edit]
[-] base64.rb [edit]
[-] thwait.rb [edit]
[-] webrick.rb [edit]
[-] erb.rb [edit]
[-] rake.rb [edit]
[+] shell
[-] expect.rb [edit]
[-] open3.rb [edit]
[+] cgi
[-] tmpdir.rb [edit]
[-] ipaddr.rb [edit]
[-] pstore.rb [edit]
[-] singleton.rb [edit]
[+] rubygems
[-] set.rb [edit]
[-] observer.rb [edit]
[-] drb.rb [edit]
[-] irb.rb [edit]
[-] prime.rb [edit]
[+] x86_64-linux
[+] optparse