--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/jdk/test/java/lang/ref/Basic.java	Sat Dec 01 00:00:00 2007 +0000
@@ -0,0 +1,148 @@
+/*
+ * Copyright 1997-1998 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
+ * @summary Basic functional test of reference objects
+ * @author Mark Reinhold
+ */
+
+
+import java.lang.ref.*;
+import java.util.Vector;
+
+
+public class Basic {
+
+    static ReferenceQueue q = new ReferenceQueue();
+    static ReferenceQueue q2 = new ReferenceQueue();
+    static Reference rw, rw2, rp, rp2;
+    static Vector keep = new Vector();
+    static boolean finalized = false;
+
+    public static class ClearFinalizerThread {
+        protected void finalize() {
+            System.err.println("Cleared finalizer thread");
+        }
+    };
+
+    protected void finalize() {
+        Basic.finalized = true;
+        System.err.println("Finalized " + this);
+    }
+
+    public static class Sub { };
+
+    Object sub = new Sub();
+
+    static void fork(Runnable proc) throws InterruptedException {
+        Thread t = new Thread(proc);
+        t.start();
+        t.join();
+    }
+
+    static void showReferences() throws InterruptedException {
+        fork(new Runnable() {
+            public void run() {
+                System.err.println("References: W " + rw.get()
+                                   + ", W2 " + rw2.get()
+                                   + ", P " + rp.get()
+                                   + ", P2 " + rp2.get());
+            }
+        });
+    }
+
+    static void createNoise() throws InterruptedException {
+        fork(new Runnable() {
+            public void run() {
+                keep.addElement(new PhantomReference(new Object(), q2));
+            }
+        });
+    }
+
+
+    public static void main(String[] args) throws Exception {
+
+        fork(new Runnable() {
+            public void run() {
+                Basic s = new Basic();
+                rw = new WeakReference(s, q);
+                rw2 = new WeakReference(s);
+                rp = new PhantomReference(s, q);
+                rp2 = new PhantomReference(s.sub, q);
+                s = null;
+            }
+        });
+
+        showReferences();
+
+        int ndq = 0;
+        boolean prevFinalized = false;
+    outer:
+        for (int i = 1;; i++) {
+            Reference r;
+
+            createNoise();
+            System.err.println("GC " + i);
+            Thread.sleep(10);
+            System.gc();
+
+            showReferences();
+            while ((r = q2.poll()) != null) {
+                System.err.println("Noise " + r);
+            }
+
+            /* Cause a dummy object to be finalized, since the finalizer thread
+               might retain a reference to the Basic instance after it's been
+               finalized (this happens with java_g) */
+            if (Basic.finalized && !prevFinalized) {
+                fork(new Runnable() {
+                    public void run() {
+                        new ClearFinalizerThread();
+                    }});
+                prevFinalized = true;
+            }
+
+            while ((r = q.poll()) != null) {
+                ndq++;
+                if (r != null) {
+                    System.err.println("Dequeued " + r);
+                    if (ndq == 3) break outer;
+                }
+            }
+
+            if (i >= 10) break;
+
+        }
+
+        if (ndq != 3) {
+            throw new Exception("Expected to dequeue 3 reference objects,"
+                                + " but only got " + ndq);
+        }
+
+        if (! Basic.finalized) {
+            throw new Exception("Test object not finalized");
+        }
+
+    }
+
+}