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comparison test/compiler/testlibrary/rtm/BusyLock.java @ 17871:665bbe93823f

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8039499: Add all common classes used by tests on RTM support to testlibrary Reviewed-by: kvn, iignatyev Contributed-by: filipp.zhinkin@oracle.com
author iignatyev
date Mon, 14 Apr 2014 19:29:34 +0400
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17870:a0eb3f61d34a 17871:665bbe93823f
1 /*
2 * Copyright (c) 2014, 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.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 package rtm;
26
27 import com.oracle.java.testlibrary.Utils;
28 import sun.misc.Unsafe;
29
30 import java.util.concurrent.BrokenBarrierException;
31 import java.util.concurrent.CyclicBarrier;
32
33 /**
34 * Test case for busy lock scenario.
35 * One thread enters the monitor and sleep for a while.
36 * Another thread is blocked on the same monitor.
37 */
38 public class BusyLock implements CompilableTest, Runnable {
39 private static final int DEFAULT_TIMEOUT = 1000;
40 private final CyclicBarrier barrier;
41
42 // Following field have to be static in order to avoid escape analysis.
43 @SuppressWarnings("UnsuedDeclaration")
44 private static int field = 0;
45 private static final Unsafe UNSAFE = Utils.getUnsafe();
46 protected final Object monitor;
47 protected final int timeout;
48
49 public BusyLock() {
50 this(BusyLock.DEFAULT_TIMEOUT);
51 }
52
53 public BusyLock(int timeout) {
54 this.timeout = timeout;
55 this.monitor = new Object();
56 this.barrier = new CyclicBarrier(2);
57 }
58
59 @Override
60 public void run() {
61 try {
62 // wait until forceAbort leave monitor
63 barrier.await();
64 if (UNSAFE.tryMonitorEnter(monitor)) {
65 try {
66 barrier.await();
67 Thread.sleep(timeout);
68 } finally {
69 UNSAFE.monitorExit(monitor);
70 }
71 } else {
72 throw new RuntimeException("Monitor should be entered by " +
73 "::run() first.");
74 }
75 } catch (InterruptedException | BrokenBarrierException e) {
76 throw new RuntimeException("Synchronization error happened.", e);
77 }
78 }
79
80 public void test() {
81 try {
82 barrier.await();
83 // wait until monitor is locked by a ::run method
84 barrier.await();
85 } catch (InterruptedException | BrokenBarrierException e) {
86 throw new RuntimeException("Synchronization error happened.", e);
87 }
88 synchronized(monitor) {
89 BusyLock.field++;
90 }
91 }
92
93 @Override
94 public String getMethodWithLockName() {
95 return this.getClass().getName() + "::test";
96 }
97
98 @Override
99 public String[] getMethodsToCompileNames() {
100 return new String[] { getMethodWithLockName() };
101 }
102
103 /**
104 * Usage:
105 * BusyLock [ <inflate monitor> [ <timeout> ] ]
106 *
107 * Default values are:
108 * <ul>
109 * <li>inflate monitor = {@code true}</li>
110 * <li>timeout = {@code BusyLock.DEFAULT_TIMEOUT}</li>
111 * </ul>
112 */
113 public static void main(String args[]) throws Exception {
114 int timeoutValue = BusyLock.DEFAULT_TIMEOUT;
115 boolean inflateMonitor = true;
116
117 if (args.length > 0 ) {
118 inflateMonitor = Boolean.valueOf(args[0]);
119
120 if (args.length > 1) {
121 timeoutValue = Integer.valueOf(args[1]);
122 }
123 }
124
125 BusyLock busyLock = new BusyLock(timeoutValue);
126
127 if (inflateMonitor) {
128 AbortProvoker.inflateMonitor(busyLock.monitor);
129 }
130
131 Thread t = new Thread(busyLock);
132 t.start();
133 busyLock.test();
134 t.join();
135 }
136 }