Reference.java (clear): Set referent to null and synchronize.

2003-09-19  David Daney <ddaney@avtrex.com>

	* java/lang/ref/Reference.java (clear): Set referent to null and
	synchronize.

From-SVN: r71597

libjava/ChangeLog

+2003-09-19  David Daney <ddaney@avtrex.com>
+
+	* java/lang/ref/Reference.java (clear): Set referent to null and
+	synchronize.
+
 2003-09-19  Michael Koch  <konqueror@gmx.de>
 
 	* gnu/java/nio/NIODatagramSocket.java,

libjava/java/lang/ref/Reference.java

@@ -176,8 +176,13 @@ public abstract class Reference
    */
   public void clear()
   {
+    // Must synchronize so changes are visible in finalizer thread.
+    synchronized (lock)
+      {
+        referent = null;
         cleared = true;
       }
+  }
 
   /**
    * Tells if the object is enqueued on a reference queue.