--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/jdk/test/sun/management/HotspotThreadMBean/GetInternalThreads.java	Sat Dec 01 00:00:00 2007 +0000
@@ -0,0 +1,77 @@
+/*
+ * Copyright 2003-2004 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     4530538
+ * @summary Basic Test for HotspotThreadMBean.getInternalThreadCount()
+ *          and getInternalThreadCpuTime()
+ * @author  Mandy Chung
+ */
+
+import sun.management.*;
+import java.util.*;
+import java.lang.management.ThreadMXBean;
+
+public class GetInternalThreads {
+    private static HotspotThreadMBean mbean =
+        ManagementFactory.getHotspotThreadMBean();
+
+    // Minimum number of VM internal threads
+    //   VM thread, watcher thread, Low memory detector, compiler thread
+    private static final long MIN_VALUE_FOR_PASS = 4;
+    private static final long MAX_VALUE_FOR_PASS = Long.MAX_VALUE;
+
+    public static void main(String[] args) {
+        long value = mbean.getInternalThreadCount();
+
+        if (value < MIN_VALUE_FOR_PASS || value > MAX_VALUE_FOR_PASS) {
+            throw new RuntimeException("Internal thread count " +
+                                       "illegal value: " + value + " " +
+                                       "(MIN = " + MIN_VALUE_FOR_PASS + "; " +
+                                       "MAX = " + MAX_VALUE_FOR_PASS + ")");
+        }
+
+        System.out.println("Internal Thread Count = " + value);
+
+        ThreadMXBean thread =
+            java.lang.management.ManagementFactory.getThreadMXBean();
+        if (!thread.isThreadCpuTimeSupported()) {
+            System.out.println("Thread Cpu Time is not supported.");
+            return;
+        }
+
+        Map times = mbean.getInternalThreadCpuTimes();
+        Iterator iter = times.entrySet().iterator();
+        for (; iter.hasNext(); ) {
+            Map.Entry entry = (Map.Entry) iter.next();
+            System.out.println(entry.getKey() +
+                " CPU time = " + entry.getValue() + "ns");
+            if (((Long) entry.getValue()).longValue() < 0) {
+                throw new RuntimeException("Thread CPU time" +
+                    "illegal value: " + entry.getValue());
+            }
+        }
+        System.out.println("Test passed.");
+    }
+}