1 /*
2 * Copyright (c) 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 * @test
26 * @summary Create a thread which stops in methods a(), a()->b(), a()->b()->c(),
27 * synchronizing on one monitor inside of each method.
28 * After checking that lock info is correct invoke another method
29 * and get the lock again. Repeat this action.
30 * @modules java.base/jdk.internal.misc
31 * @library /test/lib/share/classes
32 * @library ../share
33 * @build common.*
34 *
35 * @run main/othervm -XX:+UsePerfData SpreadLockTest
36 */
37 import common.ToolResults;
38 import java.util.Iterator;
39 import utils.*;
40
41 class SpreadLockDebuggee extends Thread {
42
43 static final String THREAD_NAME = "MyThread";
44
45 SpreadLockDebuggee() {
46 setName(THREAD_NAME);
47 }
48
49 Object monitor = new Object();
50
51 public void c() {
52 synchronized (monitor) {
53 Utils.sleep();
54 }
55 }
56
57 public void b() {
58 synchronized (monitor) {
59 try {
60 while (true) {
61 Thread.sleep(Long.MAX_VALUE);
62 }
63 } catch (InterruptedException e) {
64 c();
65 }
66 }
67 }
68
69 public void a() {
70 synchronized (monitor) {
71 try {
72 while (true) {
73 Thread.sleep(Long.MAX_VALUE);
74 }
75 } catch (InterruptedException e) {
76 b();
77 }
78 }
79 }
80
81 @Override
82 public void run() {
83 a();
84 }
85
86 }
87
88 public class SpreadLockTest {
89
90 public static void main(String[] args) throws Exception {
91 new SpreadLockTest().doTest();
92 }
93
94 private void doTest() throws Exception {
95 SpreadLockDebuggee debuggee = new SpreadLockDebuggee();
96
97 // Start in method a()
98 debuggee.start();
99
100 // Collect output from the jstack tool
101 JstackTool jstackTool = new JstackTool(ProcessHandle.current().getPid());
102 ToolResults results1 = jstackTool.measure();
103
104 // Go to method b()
105 debuggee.interrupt();
106
107 // Collect output from the jstack tool
108 ToolResults results2 = jstackTool.measure();
109
110 // Go to method c()
111 debuggee.interrupt();
112
113 // Collect output from the jstack tool
114 ToolResults results3 = jstackTool.measure();
115
116 analyse(results1.getStdoutString(), results2.getStdoutString(), results3.getStdoutString());
117 }
118
119 // Analyzing the outputs from the 3 jstack runs
120 public void analyse(String result1, String result2, String result3) {
121 String jstackStr1 = result1;
122 String jstackStr2 = result2;
123 String jstackStr3 = result3;
124
125 if (jstackStr1 == null) {
126 throw new RuntimeException("First jstack output is empty");
127 }
128 if (jstackStr2 == null) {
129 throw new RuntimeException("Second jstack output is empty");
130 }
131 if (jstackStr3 == null) {
132 throw new RuntimeException("Third jstack output is empty");
133 }
134
135 Format format = new DefaultFormat();
136 JStack jstack1 = format.parse(jstackStr1);
137 JStack jstack2 = format.parse(jstackStr2);
138 JStack jstack3 = format.parse(jstackStr3);
139
140 ThreadStack ts1 = jstack1.getThreadStack(SpreadLockDebuggee.THREAD_NAME);
141 ThreadStack ts2 = jstack2.getThreadStack(SpreadLockDebuggee.THREAD_NAME);
142 ThreadStack ts3 = jstack3.getThreadStack(SpreadLockDebuggee.THREAD_NAME);
143
144 if (ts1 == null || ts2 == null || ts3 == null) {
145 throw new RuntimeException(
146 "One of thread stack trace is null in the first jstack output : "
147 + ts1 + ", " + ts2 + ", " + ts3);
148 }
149
150 MonitorInfo[] monitorInfo = new MonitorInfo[6];
151 int counter = 0;
152
153 Iterator<MethodInfo> it = ts1.getStack().iterator();
154 while (it.hasNext()) {
155 MethodInfo mi = it.next();
156 if (mi.getName().startsWith(SpreadLockDebuggee.class.getName() + ".a")) {
157 monitorInfo[counter++] = haveToHaveOneLock(mi);
158 }
159 }
160
161 it = ts2.getStack().iterator();
162 while (it.hasNext()) {
163 MethodInfo mi = it.next();
164 if (mi.getName().startsWith(SpreadLockDebuggee.class.getName() + ".a")
165 || mi.getName().startsWith(SpreadLockDebuggee.class.getName() + ".b")) {
166 monitorInfo[counter++] = haveToHaveOneLock(mi);
167 }
168 }
169
170 it = ts3.getStack().iterator();
171 while (it.hasNext()) {
172 MethodInfo mi = it.next();
173 if (mi.getName().startsWith(SpreadLockDebuggee.class.getName() + ".a")
174 || mi.getName().startsWith(SpreadLockDebuggee.class.getName() + ".b")
175 || mi.getName().startsWith(SpreadLockDebuggee.class.getName() + ".c")) {
176 monitorInfo[counter++] = haveToHaveOneLock(mi);
177 }
178 }
179
180 System.out.println("All monitors found - passed");
181
182 }
183
184 private MonitorInfo haveToHaveOneLock(MethodInfo mi) {
185 if (mi.getLocks().size() == 1) {
186 System.out.println("Method \"" + mi.getName()
187 + "\" contain 1 lock - correct");
188 return mi.getLocks().getFirst();
189 } else {
190 throw new RuntimeException("Lock count ("
191 + mi.getLocks().size() + ") is incorrect in method \""
192 + mi.getName() + "\"");
193 }
194 }
195
196 }