clear object on ref when it is no longer found

Author: Brian Durand

lib/ref/safe_monitor.rb

@@ -33,7 +33,7 @@ def unlock
           @count -= 1
           if @count == 0
             @owner = nil
-            @mutex.unlock rescue puts "current #{Thread.current.object_id}; owner #{@owner}"
+            @mutex.unlock
           end
         end
       end

lib/ref/weak_reference/pure_ruby.rb

@@ -75,7 +75,17 @@ def initialize(obj) #:nodoc:
     # Get the reference object. If the object has already been garbage collected,
     # then this method will return nil.
     def object #:nodoc:
-      @reference_pointer.object
+      if @reference_pointer
+        obj = @reference_pointer.object
+        unless obj
+          @@lock.synchronize do
+            @@weak_references.delete(object_id)
+            @reference_pointer.cleanup
+            @reference_pointer = nil
+          end
+        end
+        obj
+      end
     end
   end
 end