137 lines
4.2 KiB
Java
137 lines
4.2 KiB
Java
/*
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* Copyright (c) 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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package rtm;
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import com.oracle.java.testlibrary.Utils;
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import sun.misc.Unsafe;
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import java.util.concurrent.BrokenBarrierException;
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import java.util.concurrent.CyclicBarrier;
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/**
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* Test case for busy lock scenario.
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* One thread enters the monitor and sleep for a while.
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* Another thread is blocked on the same monitor.
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*/
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public class BusyLock implements CompilableTest, Runnable {
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private static final int DEFAULT_TIMEOUT = 1000;
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private final CyclicBarrier barrier;
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// Following field have to be static in order to avoid escape analysis.
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@SuppressWarnings("UnsuedDeclaration")
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private static int field = 0;
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private static final Unsafe UNSAFE = Utils.getUnsafe();
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protected final Object monitor;
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protected final int timeout;
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public BusyLock() {
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this(BusyLock.DEFAULT_TIMEOUT);
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}
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public BusyLock(int timeout) {
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this.timeout = timeout;
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this.monitor = new Object();
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this.barrier = new CyclicBarrier(2);
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}
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@Override
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public void run() {
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try {
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// wait until forceAbort leave monitor
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barrier.await();
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if (UNSAFE.tryMonitorEnter(monitor)) {
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try {
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barrier.await();
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Thread.sleep(timeout);
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} finally {
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UNSAFE.monitorExit(monitor);
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}
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} else {
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throw new RuntimeException("Monitor should be entered by " +
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"::run() first.");
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}
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} catch (InterruptedException | BrokenBarrierException e) {
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throw new RuntimeException("Synchronization error happened.", e);
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}
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}
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public void test() {
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try {
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barrier.await();
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// wait until monitor is locked by a ::run method
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barrier.await();
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} catch (InterruptedException | BrokenBarrierException e) {
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throw new RuntimeException("Synchronization error happened.", e);
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}
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synchronized(monitor) {
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BusyLock.field++;
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}
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}
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@Override
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public String getMethodWithLockName() {
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return this.getClass().getName() + "::test";
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}
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@Override
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public String[] getMethodsToCompileNames() {
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return new String[] { getMethodWithLockName() };
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}
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/**
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* Usage:
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* BusyLock [ <inflate monitor> [ <timeout> ] ]
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*
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* Default values are:
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* <ul>
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* <li>inflate monitor = {@code true}</li>
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* <li>timeout = {@code BusyLock.DEFAULT_TIMEOUT}</li>
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* </ul>
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*/
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public static void main(String args[]) throws Exception {
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int timeoutValue = BusyLock.DEFAULT_TIMEOUT;
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boolean inflateMonitor = true;
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if (args.length > 0 ) {
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inflateMonitor = Boolean.valueOf(args[0]);
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if (args.length > 1) {
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timeoutValue = Integer.valueOf(args[1]);
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}
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}
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BusyLock busyLock = new BusyLock(timeoutValue);
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if (inflateMonitor) {
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AbortProvoker.inflateMonitor(busyLock.monitor);
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}
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Thread t = new Thread(busyLock);
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t.start();
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busyLock.test();
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t.join();
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}
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}
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