1 /* 2 * Copyright (c) 2013, 2019, 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.testlibrary.Asserts.assertFalse; 29 import static jdk.testlibrary.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.testlibrary.jfr.EventNames; 38 import jdk.testlibrary.jfr.Events; 39 import jdk.testlibrary.management.ThreadMXBeanTool; 40 import jdk.testlibrary.thread.TestThread; 41 import jdk.testlibrary.thread.XRun; 42 43 /* 44 * @test 45 * @key jfr 46 * @library /lib/testlibrary 47 * 48 * @run main/othervm jdk.jfr.event.runtime.TestJavaBlockedEvent 49 */ 50 public class TestJavaBlockedEvent { 51 private static final String EVENT_NAME = EventNames.JavaMonitorEnter; 52 private static final long THRESHOLD_MILLIS = 1; 53 54 static class Lock { 55 } 56 57 public static void main(String[] args) throws Throwable { 58 Recording recording = new Recording(); 59 60 recording.enable(EVENT_NAME).withThreshold(Duration.ofMillis(THRESHOLD_MILLIS)); 61 recording.start(); 62 final Lock lock = new Lock(); 63 final CountDownLatch blockerInLock = new CountDownLatch(1); 64 final CountDownLatch blockingFinished = new CountDownLatch(1); 65 final CountDownLatch blockedFinished = new CountDownLatch(1); 66 TestThread blockerThread = new TestThread(new XRun() { 67 @Override 68 public void xrun() throws Throwable { 69 synchronized (lock) { 70 blockerInLock.countDown(); 71 blockingFinished.await(); 72 } 73 blockedFinished.await(); 74 } 75 }); 76 77 TestThread blockedThread = new TestThread(new XRun() { 78 @Override 79 public void xrun() throws Throwable { 80 blockerInLock.await(); 81 synchronized (lock) { 82 blockedFinished.countDown(); 83 } 84 } 85 }); 86 blockerThread.start(); 87 blockedThread.start(); 88 89 blockerInLock.await(); 90 ThreadMXBeanTool.waitUntilBlockingOnObject(blockedThread, Thread.State.BLOCKED, lock); 91 Thread.sleep(2 * THRESHOLD_MILLIS); 92 blockingFinished.countDown(); 93 blockedFinished.await(); 94 95 blockedThread.join(); 96 blockerThread.join(); 97 recording.stop(); 98 99 List<RecordedEvent> events = Events.fromRecording(recording); 100 boolean isAnyFound = false; 101 for (RecordedEvent event : events) { 102 System.out.println("Event:" + event); 103 if (event.getThread().getJavaThreadId() == blockedThread.getId()) { 104 if (isMyLock(Events.assertField(event, "monitorClass.name").getValue())) { 105 Events.assertEventThread(event, "previousOwner", blockerThread); 106 Events.assertField(event, "address").above(0L); 107 assertFalse(isAnyFound, "Found multiple events"); 108 isAnyFound = true; 109 } 110 } 111 } 112 assertTrue(isAnyFound, "No blocking event from " + blockedThread.getName()); 113 } 114 115 private static boolean isMyLock(String className) { 116 return Lock.class.getName().replace('.', '/').equals(className); 117 } 118 }