--- /dev/null	2018-06-17 23:18:20.806999507 +0800
+++ new/test/lib/testlibrary/jdk/testlibrary/management/ThreadMXBeanTool.java	2019-01-29 11:06:19.638879922 +0800
@@ -0,0 +1,72 @@
+/*
+ * Copyright (c) 2015, 2019, 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.
+ *
+ * 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 jdk.testlibrary.management;
+
+import java.lang.management.ManagementFactory;
+import java.lang.management.ThreadInfo;
+import java.lang.management.ThreadMXBean;
+
+/**
+ * A few utility methods to use ThreadMXBean.
+ */
+public final class ThreadMXBeanTool {
+
+    /**
+     * Waits until {@link Thread} is in the certain {@link Thread.State}
+     * and blocking on {@code object}.
+     *
+     * @param state The thread state
+     * @param object The object to block on
+     */
+    public static void waitUntilBlockingOnObject(Thread thread, Thread.State state, Object object)
+        throws InterruptedException {
+        String want = object == null ? null : object.getClass().getName() + '@'
+                + Integer.toHexString(System.identityHashCode(object));
+        ThreadMXBean tmx = ManagementFactory.getThreadMXBean();
+        while (thread.isAlive()) {
+            ThreadInfo ti = tmx.getThreadInfo(thread.getId());
+            if (ti.getThreadState() == state
+                    && (want == null || want.equals(ti.getLockName()))) {
+                return;
+            }
+            Thread.sleep(1);
+        }
+    }
+
+    /**
+     * Waits until {@link Thread} is in native.
+     */
+    public static void waitUntilInNative(Thread thread) throws InterruptedException {
+        ThreadMXBean tmx = ManagementFactory.getThreadMXBean();
+        while (thread.isAlive()) {
+            ThreadInfo ti = tmx.getThreadInfo(thread.getId());
+            if (ti.isInNative()) {
+                return;
+            }
+            Thread.sleep(1);
+        }
+    }
+
+}
+