--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/java.management/share/classes/sun/management/HotspotThread.java	Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,79 @@
+/*
+ * Copyright (c) 2003, 2012, Oracle and/or its affiliates. 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.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+package sun.management;
+
+import java.util.Map;
+import java.util.HashMap;
+import sun.management.counter.Counter;
+
+
+/**
+ * Implementation class of HotspotThreadMBean interface.
+ *
+ * Internal, uncommitted management interface for Hotspot threading
+ * system.
+ */
+class HotspotThread
+    implements HotspotThreadMBean {
+
+    private VMManagement jvm;
+
+    /**
+     * Constructor of HotspotThread class.
+     */
+    HotspotThread(VMManagement vm) {
+        jvm = vm;
+    }
+
+    public native int getInternalThreadCount();
+
+    public Map<String, Long> getInternalThreadCpuTimes() {
+        int count = getInternalThreadCount();
+        if (count == 0) {
+            return java.util.Collections.emptyMap();
+        }
+        String[] names = new String[count];
+        long[] times = new long[count];
+        int numThreads = getInternalThreadTimes0(names, times);
+        Map<String, Long> result = new HashMap<>(numThreads);
+        for (int i = 0; i < numThreads; i++) {
+            result.put(names[i], times[i]);
+        }
+        return result;
+    }
+    public native int getInternalThreadTimes0(String[] names, long[] times);
+
+    // Performance counter support
+    private static final String JAVA_THREADS    = "java.threads.";
+    private static final String COM_SUN_THREADS = "com.sun.threads.";
+    private static final String SUN_THREADS     = "sun.threads.";
+    private static final String THREADS_COUNTER_NAME_PATTERN =
+        JAVA_THREADS + "|" + COM_SUN_THREADS + "|" + SUN_THREADS;
+
+    public java.util.List<Counter> getInternalThreadingCounters() {
+        return jvm.getInternalCounters(THREADS_COUNTER_NAME_PATTERN);
+    }
+}