--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/jdk/test/java/util/Collections/ViewSynch.java	Sat Dec 01 00:00:00 2007 +0000
@@ -0,0 +1,75 @@
+/*
+ * Copyright 1999 Sun Microsystems, Inc.  All Rights Reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ */
+
+/**
+ * @test
+ * @bug 4268780
+ * @summary Collection-views of submap-views of synchronized-views of
+ *          SortedMap objects do not synchronize on the correct object.
+ *          (Got that?)
+ */
+
+import java.util.*;
+
+public class ViewSynch {
+    static final Integer ZERO = new Integer(0);
+    static final Int INT_ZERO = new Int(0);
+    static final Int INT_ONE = new Int(1);
+    static SortedMap m = Collections.synchronizedSortedMap(new TreeMap());
+    static Map m2 = m.tailMap(ZERO);
+    static Collection c = m2.values();
+
+    public static void main(String[] args) {
+        for (int i=0; i<10000; i++)
+            m.put(new Integer(i), INT_ZERO);
+
+        new Thread() {
+            public void run() {
+                for (int i=0; i<100; i++) {
+                    Thread.yield();
+                    m.remove(ZERO);
+                    m.put(ZERO, INT_ZERO);
+                }
+            }
+        }.start();
+
+        c.contains(INT_ONE);
+    }
+}
+
+/**
+ * Like Integer, except yields while doing equals comparison, to allow
+ * for interleaving.
+ */
+class Int {
+    Integer x;
+    Int(int i) {x = new Integer(i);}
+
+    public boolean equals(Object o) {
+        Thread.yield();
+        Int i = (Int)o;
+        return x.equals(i.x);
+    }
+
+    public int hashCode() {return x.hashCode();}
+}