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  * @library /test/lib

    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 }