author | jbachorik |
Thu, 23 Jan 2014 10:06:52 +0100 | |
changeset 22568 | 8871c88d0793 |
parent 19814 | 77d0468c8874 |
child 25181 | 216e0899f503 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2003, 2014, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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*/ |
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/* |
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* @test |
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* @bug 4530538 |
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* @summary Basic unit test of the synchronization statistics support: |
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* |
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* @author Mandy Chung |
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* @author Jaroslav Bachorik |
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* |
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* @run main/othervm SynchronizationStatistics |
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*/ |
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import java.lang.management.*; |
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import java.util.concurrent.Phaser; |
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public class SynchronizationStatistics { |
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private static class LockerThread extends Thread { |
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public LockerThread(Runnable r) { |
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super(r, "LockerThread"); |
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} |
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} |
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private static final ThreadMXBean mbean = ManagementFactory.getThreadMXBean(); |
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private static final boolean blockedTimeCheck = |
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mbean.isThreadContentionMonitoringSupported(); |
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public static void main(String args[]) throws Exception { |
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if (blockedTimeCheck) { |
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mbean.setThreadContentionMonitoringEnabled(true); |
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} |
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if (!mbean.isThreadContentionMonitoringEnabled()) { |
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throw new RuntimeException("TEST FAILED: " + |
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"Thread Contention Monitoring is not enabled"); |
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} |
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testBlockingOnSimpleMonitor(); |
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testBlockingOnNestedMonitor(); |
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testWaitingOnSimpleMonitor(); |
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testMultiWaitingOnSimpleMonitor(); |
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testWaitingOnNestedMonitor(); |
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System.out.println("Test passed."); |
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} |
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private static LockerThread newLockerThread(Runnable r) { |
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LockerThread t = new LockerThread(r); |
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t.setDaemon(true); |
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return t; |
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} |
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private static void waitForThreadState(Thread t, Thread.State state) throws InterruptedException { |
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while (!t.isInterrupted() && t.getState() != state) { |
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Thread.sleep(3); |
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} |
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} |
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/** |
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* Tests that blocking on a single monitor properly increases the |
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* blocked count at least by 1. Also asserts that the correct lock name is provided. |
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*/ |
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private static void testBlockingOnSimpleMonitor() throws Exception { |
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System.out.println("testBlockingOnSimpleMonitor"); |
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final Object lock1 = new Object(); |
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final Phaser p = new Phaser(2); |
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LockerThread lt = newLockerThread(new Runnable() { |
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@Override |
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public void run() { |
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p.arriveAndAwaitAdvance(); // phase[1] |
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synchronized(lock1) { |
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System.out.println("[LockerThread obtained Lock1]"); |
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p.arriveAndAwaitAdvance(); // phase[2] |
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} |
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p.arriveAndAwaitAdvance(); // phase[3] |
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} |
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}); |
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lt.start(); |
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long tid = lt.getId(); |
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ThreadInfo ti = mbean.getThreadInfo(tid); |
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String lockName = null; |
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synchronized(lock1) { |
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p.arriveAndAwaitAdvance(); // phase[1] |
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waitForThreadState(lt, Thread.State.BLOCKED); |
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lockName = mbean.getThreadInfo(tid).getLockName(); |
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} |
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p.arriveAndAwaitAdvance(); // phase[2] |
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testBlocked(ti, mbean.getThreadInfo(tid), lockName, lock1); |
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p.arriveAndDeregister(); // phase[3] |
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lt.join(); |
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System.out.println("OK"); |
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} |
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/** |
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* Tests that blocking on a nested monitor properly increases the |
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* blocked count at least by 1 - it is not affected by the nesting depth. |
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* Also asserts that the correct lock name is provided. |
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*/ |
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private static void testBlockingOnNestedMonitor() throws Exception { |
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System.out.println("testBlockingOnNestedMonitor"); |
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final Object lock1 = new Object(); |
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final Object lock2 = new Object(); |
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final Phaser p = new Phaser(2); |
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LockerThread lt = newLockerThread(new Runnable() { |
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@Override |
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public void run() { |
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p.arriveAndAwaitAdvance(); // phase[1] |
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synchronized(lock1) { |
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System.out.println("[LockerThread obtained Lock1]"); |
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p.arriveAndAwaitAdvance(); // phase[2] |
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p.arriveAndAwaitAdvance(); // phase[3] |
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synchronized(lock2) { |
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System.out.println("[LockerThread obtained Lock2]"); |
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p.arriveAndAwaitAdvance(); // phase[4] |
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} |
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p.arriveAndAwaitAdvance(); // phase[5] |
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} |
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} |
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}); |
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lt.start(); |
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long tid = lt.getId(); |
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ThreadInfo ti = mbean.getThreadInfo(tid); |
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ThreadInfo ti1 = null; |
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String lockName = null; |
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synchronized(lock1) { |
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p.arriveAndAwaitAdvance(); // phase[1] |
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waitForThreadState(lt, Thread.State.BLOCKED); |
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lockName = mbean.getThreadInfo(tid).getLockName(); |
2 | 158 |
} |
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p.arriveAndAwaitAdvance(); // phase[2] |
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|
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ti1 = mbean.getThreadInfo(tid); |
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testBlocked(ti, ti1, lockName, lock1); |
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ti = ti1; |
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164 |
|
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synchronized(lock2) { |
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p.arriveAndAwaitAdvance(); // phase [3] |
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waitForThreadState(lt, Thread.State.BLOCKED); |
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lockName = mbean.getThreadInfo(tid).getLockName(); |
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} |
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p.arriveAndAwaitAdvance(); // phase [4] |
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testBlocked(ti, mbean.getThreadInfo(tid), lockName, lock2); |
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p.arriveAndDeregister(); |
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173 |
|
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lt.join(); |
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175 |
|
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System.out.println("OK"); |
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} |
2 | 178 |
|
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/** |
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* Tests that waiting on a single monitor properly increases the waited |
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* count by 1 and the waited time by a positive number. |
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*/ |
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private static void testWaitingOnSimpleMonitor() throws Exception { |
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System.out.println("testWaitingOnSimpleMonitor"); |
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final Object lock1 = new Object(); |
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final Phaser p = new Phaser(2); |
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LockerThread lt = newLockerThread(new Runnable() { |
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188 |
@Override |
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public void run() { |
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p.arriveAndAwaitAdvance(); // phase[1] |
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synchronized(lock1) { |
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System.out.println("[LockerThread obtained Lock1]"); |
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try { |
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lock1.wait(300); |
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} catch (InterruptedException ex) { |
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196 |
// ignore |
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197 |
} |
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198 |
p.arriveAndAwaitAdvance(); // phase[2] |
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199 |
} |
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200 |
p.arriveAndAwaitAdvance(); // phase[3] |
2 | 201 |
} |
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202 |
}); |
2 | 203 |
|
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204 |
lt.start(); |
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ThreadInfo ti1 = mbean.getThreadInfo(lt.getId()); |
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206 |
synchronized(lock1) { |
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p.arriveAndAwaitAdvance(); // phase[1] |
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waitForThreadState(lt, Thread.State.BLOCKED); |
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209 |
} |
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p.arriveAndAwaitAdvance(); // phase[2] |
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211 |
|
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ThreadInfo ti2 = mbean.getThreadInfo(lt.getId()); |
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p.arriveAndDeregister(); // phase[3] |
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214 |
|
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lt.join(); |
2 | 216 |
|
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testWaited(ti1, ti2, 1); |
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System.out.println("OK"); |
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} |
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220 |
|
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221 |
/** |
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222 |
* Tests that waiting multiple times on the same monitor subsequently |
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* increases the waited count by the number of subsequent calls and the |
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224 |
* waited time by a positive number. |
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225 |
*/ |
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226 |
private static void testMultiWaitingOnSimpleMonitor() throws Exception { |
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System.out.println("testWaitingOnMultipleMonitors"); |
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final Object lock1 = new Object(); |
2 | 229 |
|
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final Phaser p = new Phaser(2); |
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231 |
LockerThread lt = newLockerThread(new Runnable() { |
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232 |
@Override |
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233 |
public void run() { |
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p.arriveAndAwaitAdvance(); // phase[1] |
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synchronized(lock1) { |
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System.out.println("[LockerThread obtained Lock1]"); |
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237 |
for (int i = 0; i < 3; i++) { |
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238 |
try { |
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lock1.wait(300); |
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240 |
} catch (InterruptedException ex) { |
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241 |
// ignore |
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242 |
} |
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p.arriveAndAwaitAdvance(); // phase[2-4] |
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244 |
} |
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245 |
} |
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246 |
p.arriveAndAwaitAdvance(); // phase[5] |
2 | 247 |
} |
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248 |
}); |
2 | 249 |
|
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250 |
lt.start(); |
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ThreadInfo ti1 = mbean.getThreadInfo(lt.getId()); |
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252 |
synchronized(lock1) { |
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253 |
p.arriveAndAwaitAdvance(); //phase[1] |
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waitForThreadState(lt, Thread.State.BLOCKED); |
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255 |
} |
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256 |
int phase = p.getPhase(); |
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while ((p.arriveAndAwaitAdvance() - phase) < 3); // phase[2-4] |
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258 |
|
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259 |
ThreadInfo ti2 = mbean.getThreadInfo(lt.getId()); |
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260 |
p.arriveAndDeregister(); // phase[5] |
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261 |
|
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262 |
lt.join(); |
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263 |
testWaited(ti1, ti2, 3); |
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264 |
System.out.println("OK"); |
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} |
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/** |
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* Tests that waiting on monitors places in nested synchronized blocks |
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* properly increases the waited count by the number of times the "lock.wait()" |
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* was invoked and the waited time by a positive number. |
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*/ |
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private static void testWaitingOnNestedMonitor() throws Exception { |
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System.out.println("testWaitingOnNestedMonitor"); |
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final Object lock1 = new Object(); |
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final Object lock2 = new Object(); |
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final Object lock3 = new Object(); |
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|
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final Phaser p = new Phaser(2); |
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LockerThread lt = newLockerThread(new Runnable() { |
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@Override |
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public void run() { |
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p.arriveAndAwaitAdvance(); // phase[1] |
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synchronized(lock1) { |
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System.out.println("[LockerThread obtained Lock1]"); |
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try { |
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lock1.wait(300); |
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} catch (InterruptedException ex) { |
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// ignore |
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} |
2 | 290 |
|
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p.arriveAndAwaitAdvance(); // phase[2] |
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synchronized(lock2) { |
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System.out.println("[LockerThread obtained Lock2]"); |
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try { |
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lock2.wait(300); |
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} catch (InterruptedException ex) { |
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// ignore |
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} |
2 | 299 |
|
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p.arriveAndAwaitAdvance(); // phase[3] |
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synchronized(lock3) { |
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System.out.println("[LockerThread obtained Lock3]"); |
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try { |
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lock3.wait(300); |
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} catch (InterruptedException ex) { |
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// ignore |
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} |
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p.arriveAndAwaitAdvance(); // phase[4] |
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} |
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} |
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} |
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p.arriveAndAwaitAdvance(); // phase[5] |
2 | 313 |
} |
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}); |
2 | 315 |
|
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lt.start(); |
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ThreadInfo ti1 = mbean.getThreadInfo(lt.getId()); |
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synchronized(lock1) { |
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p.arriveAndAwaitAdvance(); // phase[1] |
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waitForThreadState(lt, Thread.State.BLOCKED); |
2 | 321 |
} |
322 |
||
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synchronized(lock2) { |
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p.arriveAndAwaitAdvance(); // phase[2] |
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waitForThreadState(lt, Thread.State.BLOCKED); |
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} |
2 | 327 |
|
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synchronized(lock3) { |
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p.arriveAndAwaitAdvance(); // phase[3] |
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waitForThreadState(lt, Thread.State.BLOCKED); |
2 | 331 |
} |
332 |
||
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p.arriveAndAwaitAdvance(); // phase[4] |
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ThreadInfo ti2 = mbean.getThreadInfo(lt.getId()); |
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p.arriveAndDeregister(); // phase[5] |
2 | 336 |
|
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lt.join(); |
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testWaited(ti1, ti2, 3); |
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System.out.println("OK"); |
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} |
2 | 341 |
|
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private static void testWaited(ThreadInfo ti1, ThreadInfo ti2, int waited) throws Error { |
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long waitCntDiff = ti2.getWaitedCount() - ti1.getWaitedCount(); |
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long waitTimeDiff = ti2.getWaitedTime() - ti1.getWaitedTime(); |
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if (waitCntDiff < waited) { |
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throw new Error("Unexpected diff in waited count. Expecting at least " |
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+ waited + " , got " + waitCntDiff); |
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} |
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if (waitTimeDiff <= 0) { |
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throw new Error("Unexpected diff in waited time. Expecting increasing " + |
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"value, got " + waitTimeDiff + "ms"); |
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} |
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353 |
} |
2 | 354 |
|
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private static void testBlocked(ThreadInfo ti1, ThreadInfo ti2, |
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String lockName, final Object lock) |
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throws Error { |
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long blkCntDiff = ti2.getBlockedCount() - ti1.getBlockedCount(); |
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long blkTimeDiff = ti2.getBlockedTime() - ti1.getBlockedTime(); |
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if (blkCntDiff < 1) { |
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throw new Error("Unexpected diff in blocked count. Expecting at least 1, " + |
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"got " + blkCntDiff); |
2 | 363 |
} |
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if (blkTimeDiff < 0) { |
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throw new Error("Unexpected diff in blocked time. Expecting a positive " + |
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"number, got " + blkTimeDiff); |
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} |
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if (!lockName.equals(lock.toString())) { |
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throw new Error("Unexpected blocked monitor name. Expecting " + |
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lock.toString() + ", got " + |
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lockName); |
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372 |
} |
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373 |
} |
2 | 374 |
} |