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 syncAndTest() {
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 test();
89 }
90
91 public void test() {
92 synchronized(monitor) {
93 BusyLock.field++;
94 }
95 }
96
97 @Override
98 public String getMethodWithLockName() {
99 return this.getClass().getName() + "::test";
100 }
101
102 @Override
|
1 /*
2 * Copyright (c) 2014, 2015, 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 java.util.concurrent.BrokenBarrierException;
28 import java.util.concurrent.CyclicBarrier;
29
30 /**
31 * Test case for busy lock scenario.
32 * One thread enters the monitor and sleep for a while.
33 * Another thread is blocked on the same monitor.
34 */
35 public class BusyLock implements CompilableTest, Runnable {
36 private static final int DEFAULT_TIMEOUT = 1000;
37 private final CyclicBarrier barrier;
38
39 // Following field have to be static in order to avoid escape analysis.
40 @SuppressWarnings("UnsuedDeclaration")
41 private static int field = 0;
42 protected final Object monitor;
43 protected final int timeout;
44
45 public BusyLock() {
46 this(BusyLock.DEFAULT_TIMEOUT);
47 }
48
49 public BusyLock(int timeout) {
50 this.timeout = timeout;
51 this.monitor = new Object();
52 this.barrier = new CyclicBarrier(2);
53 }
54
55 @Override
56 public void run() {
57 try {
58 synchronized (monitor) {
59 barrier.await();
60 Thread.sleep(timeout);
61 }
62 } catch (InterruptedException | BrokenBarrierException e) {
63 throw new RuntimeException("Synchronization error happened.", e);
64 }
65 }
66
67 public void syncAndTest() {
68 try {
69 // wait until monitor is locked by a ::run method
70 barrier.await();
71 } catch (InterruptedException | BrokenBarrierException e) {
72 throw new RuntimeException("Synchronization error happened.", e);
73 }
74 test();
75 }
76
77 public void test() {
78 synchronized(monitor) {
79 BusyLock.field++;
80 }
81 }
82
83 @Override
84 public String getMethodWithLockName() {
85 return this.getClass().getName() + "::test";
86 }
87
88 @Override
|