1 /* 2 * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 24 package jdk.testlibrary.management; 25 26 import java.lang.management.ManagementFactory; 27 import java.lang.management.ThreadInfo; 28 import java.lang.management.ThreadMXBean; 29 import java.util.concurrent.TimeoutException; 30 31 /** 32 * A few utility methods to use ThreadMXBean. 33 */ 34 public final class ThreadMXBeanTool { 35 36 /** 37 * Waits until {@link Thread} is in the certain {@link State} 38 * and blocking on {@code object}. 39 * 40 * @param state The thread state 41 * @param object The object to block on 42 */ 43 public static void waitUntilBlockingOnObject(Thread thread, Thread.State state, Object object) { 44 String want = object == null ? null : object.getClass().getName() + '@' 45 + Integer.toHexString(System.identityHashCode(object)); 46 ThreadMXBean tmx = ManagementFactory.getThreadMXBean(); 47 while (thread.isAlive()) { 48 ThreadInfo ti = tmx.getThreadInfo(thread.getId()); 49 if (ti.getThreadState() == state 50 && (want == null || want.equals(ti.getLockName()))) { 51 return; 52 } 53 try { 54 Thread.sleep(1); 55 } catch (InterruptedException e) { 56 } 57 } 58 } 59 60 /** 61 * Waits until {@link Thread} is in native. 62 */ 63 public static void waitUntilInNative(Thread thread) { 64 ThreadMXBean tmx = ManagementFactory.getThreadMXBean(); 65 while (thread.isAlive()) { 66 ThreadInfo ti = tmx.getThreadInfo(thread.getId()); 67 if (ti.isInNative()) { 68 return; 69 } 70 try { 71 Thread.sleep(1); 72 } catch (InterruptedException e) { 73 } 74 } 75 } 76 77 }