From 65a5162550f58047974793cdc8067a970b2435c0 Mon Sep 17 00:00:00 2001
From: matz <matz@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Fri, 13 Aug 1999 05:45:20 +0000
Subject: 1.4.0

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@520 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 lib/weakref.rb | 34 ++++++++++++++++++++--------------
 1 file changed, 20 insertions(+), 14 deletions(-)

(limited to 'lib/weakref.rb')

diff --git a/lib/weakref.rb b/lib/weakref.rb
index c31e959e74..c6fe8cd21b 100644
--- a/lib/weakref.rb
+++ b/lib/weakref.rb
@@ -2,11 +2,12 @@
 #
 # Usage:
 #   foo = Object.new
-#   foo.hash
+#   foo = Object.new
+#   p foo.to_s			# original's class
 #   foo = WeakRef.new(foo)
-#   foo.hash
+#   p foo.to_s			# should be same class
 #   ObjectSpace.garbage_collect
-#   foo.hash	# => Raises WeakRef::RefError (because original GC'ed)
+#   p foo.to_s			# should raise exception (recycled)
 
 require "delegate"
 
@@ -15,27 +16,31 @@ class WeakRef<Delegator
   class RefError<StandardError
   end
 
-  ID_MAP =  {}
-  ID_REV_MAP =  {}
+  ID_MAP =  {}		    # obj -> [ref,...]
+  ID_REV_MAP =  {}          # ref -> obj
   ObjectSpace.add_finalizer(lambda{|id|
-			      rid = ID_MAP[id]
-			      if rid
-				ID_REV_MAP[rid] = nil
+			      rids = ID_MAP[id]
+			      if rids
+				for rid in rids
+				  ID_REV_MAP[rid] = nil
+				end
 				ID_MAP[id] = nil
 			      end
 			      rid = ID_REV_MAP[id]
 			      if rid
 				ID_REV_MAP[id] = nil
-				ID_MAP[rid] = nil
+				ID_MAP[rid].delete(id)
+      				ID_MAP[rid] = nil if ID_MAP[rid].empty?
 			      end
 			    })
-			    
+
   def initialize(orig)
     super
     @__id = orig.__id__
     ObjectSpace.call_finalizer orig
     ObjectSpace.call_finalizer self
-    ID_MAP[@__id] = self.__id__
+    ID_MAP[@__id] = [] unless ID_MAP[@__id]
+    ID_MAP[@__id].concat self.__id__
     ID_REV_MAP[self.id] = @__id
   end
 
@@ -60,10 +65,11 @@ class WeakRef<Delegator
 end
 
 if __FILE__ == $0
+  require 'thread'
   foo = Object.new
-  p foo.hash			# original's hash value
+  p foo.to_s			# original's class
   foo = WeakRef.new(foo)
-  p foo.hash			# should be same hash value
+  p foo.to_s			# should be same class
   ObjectSpace.garbage_collect
-  p foo.hash			# should raise exception (recycled)
+  p foo.to_s			# should raise exception (recycled)
 end
-- 
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