--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/jdk/test/java/lang/management/ThreadMXBean/Semaphore.java	Sat Dec 01 00:00:00 2007 +0000
@@ -0,0 +1,74 @@
+/*
+ * Copyright 2003 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.
+ */
+
+/*
+ * @bug     4530538
+ * @summary A semaphore utility class.
+ * @author  Mandy Chung
+ */
+
+public class Semaphore {
+    private Object go = new Object();
+    private int semaCount;
+    private int waiters = 0;
+
+    public Semaphore() {
+        semaCount = 0;
+    }
+
+    public Semaphore(int initialCount) {
+        semaCount = initialCount;
+    }
+
+    public void semaP() {
+        synchronized (go) {
+            waiters++;
+            while (semaCount == 0) {
+                try {
+                    go.wait();
+                } catch (InterruptedException e) {
+                    e.printStackTrace();
+                    throw new InternalError();
+                }
+            }
+            semaCount--;
+            waiters--;
+        }
+    }
+    public void semaV() {
+        synchronized (go) {
+            semaCount++;
+            go.notify();
+        }
+    }
+
+    public int getWaiterCount() {
+        synchronized (go) {
+            return waiters;
+        }
+    }
+
+    public Object getLock() {
+        return go;
+    }
+}