1 /* 2 * Copyright (c) 2013, 2018, 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. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 26 package jdk.jfr.event.runtime; 27 28 import static jdk.test.lib.Asserts.assertFalse; 29 import static jdk.test.lib.Asserts.assertTrue; 30 31 import java.time.Duration; 32 import java.util.List; 33 import java.util.concurrent.CountDownLatch; 34 35 import jdk.jfr.Recording; 36 import jdk.jfr.consumer.RecordedEvent; 37 import jdk.test.lib.jfr.EventNames; 38 import jdk.test.lib.jfr.Events; 39 import jdk.test.lib.management.ThreadMXBeanTool; 40 import jdk.test.lib.thread.TestThread; 41 import jdk.test.lib.thread.XRun; 42 43 /** 44 * @test 45 * @key jfr 46 * 47 * @library /lib / 48 * 49 * @run main/othervm jdk.jfr.event.runtime.TestJavaBlockedEvent 50 */ 51 public class TestJavaBlockedEvent { 52 private static final String EVENT_NAME = EventNames.JavaMonitorEnter; 53 private static final long THRESHOLD_MILLIS = 1; 54 55 static class Lock { 56 } 57 58 public static void main(String[] args) throws Throwable { 59 Recording recording = new Recording(); 60 61 recording.enable(EVENT_NAME).withThreshold(Duration.ofMillis(THRESHOLD_MILLIS)); 62 recording.start(); 63 final Lock lock = new Lock(); 64 final CountDownLatch blockerInLock = new CountDownLatch(1); 65 final CountDownLatch blockingFinished = new CountDownLatch(1); 66 final CountDownLatch blockedFinished = new CountDownLatch(1); 67 TestThread blockerThread = new TestThread(new XRun() { 68 @Override 69 public void xrun() throws Throwable { 70 synchronized (lock) { 71 blockerInLock.countDown(); 72 blockingFinished.await(); 73 } 74 blockedFinished.await(); 75 } 76 }); 77 78 TestThread blockedThread = new TestThread(new XRun() { 79 @Override 80 public void xrun() throws Throwable { 81 blockerInLock.await(); 82 synchronized (lock) { 83 blockedFinished.countDown(); 84 } 85 } 86 }); 87 blockerThread.start(); 88 blockedThread.start(); 89 90 blockerInLock.await(); 91 ThreadMXBeanTool.waitUntilBlockingOnObject(blockedThread, Thread.State.BLOCKED, lock); 92 Thread.sleep(2 * THRESHOLD_MILLIS); 93 blockingFinished.countDown(); 94 blockedFinished.await(); 95 96 blockedThread.join(); 97 blockerThread.join(); 98 recording.stop(); 99 100 List<RecordedEvent> events = Events.fromRecording(recording); 101 boolean isAnyFound = false; 102 for (RecordedEvent event : events) { 103 System.out.println("Event:" + event); 104 if (event.getThread().getJavaThreadId() == blockedThread.getId()) { 105 if (isMyLock(Events.assertField(event, "monitorClass.name").getValue())) { 106 Events.assertEventThread(event, "previousOwner", blockerThread); 107 Events.assertField(event, "address").above(0L); 108 assertFalse(isAnyFound, "Found multiple events"); 109 isAnyFound = true; 110 } 111 } 112 } 113 assertTrue(isAnyFound, "No blocking event from " + blockedThread.getName()); 114 } 115 116 private static boolean isMyLock(String className) { 117 return Lock.class.getName().replace('.', '/').equals(className); 118 } 119 }