| /* |
| * Copyright (c) 2014, 2015, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| package compiler.testlibrary.rtm; |
| |
| import java.util.concurrent.BrokenBarrierException; |
| import java.util.concurrent.CyclicBarrier; |
| |
| /** |
| * Test case for busy lock scenario. |
| * One thread enters the monitor and sleep for a while. |
| * Another thread is blocked on the same monitor. |
| */ |
| public class BusyLock implements CompilableTest, Runnable { |
| private static final int DEFAULT_TIMEOUT = 1000; |
| private final CyclicBarrier barrier; |
| |
| // Following field have to be static in order to avoid escape analysis. |
| @SuppressWarnings("UnsuedDeclaration") |
| private static int field = 0; |
| protected final Object monitor; |
| protected final int timeout; |
| |
| public BusyLock() { |
| this(BusyLock.DEFAULT_TIMEOUT); |
| } |
| |
| public BusyLock(int timeout) { |
| this.timeout = timeout; |
| this.monitor = new Object(); |
| this.barrier = new CyclicBarrier(2); |
| } |
| |
| @Override |
| public void run() { |
| try { |
| synchronized (monitor) { |
| barrier.await(); |
| Thread.sleep(timeout); |
| } |
| } catch (InterruptedException | BrokenBarrierException e) { |
| throw new RuntimeException("Synchronization error happened.", e); |
| } |
| } |
| |
| public void syncAndTest() { |
| try { |
| // wait until monitor is locked by a ::run method |
| barrier.await(); |
| } catch (InterruptedException | BrokenBarrierException e) { |
| throw new RuntimeException("Synchronization error happened.", e); |
| } |
| test(); |
| } |
| |
| public void test() { |
| synchronized(monitor) { |
| BusyLock.field++; |
| } |
| } |
| |
| @Override |
| public String getMethodWithLockName() { |
| return this.getClass().getName() + "::test"; |
| } |
| |
| @Override |
| public String[] getMethodsToCompileNames() { |
| return new String[] { getMethodWithLockName() }; |
| } |
| |
| /** |
| * Usage: |
| * BusyLock [ <inflate monitor> [ <timeout> ] ] |
| * |
| * Default values are: |
| * <ul> |
| * <li>inflate monitor = {@code true}</li> |
| * <li>timeout = {@code BusyLock.DEFAULT_TIMEOUT}</li> |
| * </ul> |
| */ |
| public static void main(String args[]) throws Exception { |
| int timeoutValue = BusyLock.DEFAULT_TIMEOUT; |
| boolean inflateMonitor = true; |
| |
| if (args.length > 0 ) { |
| inflateMonitor = Boolean.valueOf(args[0]); |
| |
| if (args.length > 1) { |
| timeoutValue = Integer.valueOf(args[1]); |
| } |
| } |
| |
| BusyLock busyLock = new BusyLock(timeoutValue); |
| |
| if (inflateMonitor) { |
| AbortProvoker.inflateMonitor(busyLock.monitor); |
| } |
| |
| Thread t = new Thread(busyLock); |
| t.start(); |
| busyLock.syncAndTest(); |
| t.join(); |
| } |
| } |