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 free the lock and
29 * invoke another method. Repeat this action.
30 * @modules java.base/jdk.internal.misc
31 * @library /test/lib
32 * @library ../share
33 * @run main/othervm -XX:+UsePerfData TraveledLockTest
34 */
35 import common.ToolResults;
36 import java.util.Iterator;
37 import utils.*;
38
39 class TraveledLockDebuggee extends Thread {
40
41 static final String THREAD_NAME = "MyThread";
42
43 TraveledLockDebuggee() {
44 setName(THREAD_NAME);
45 }
46
47 Object monitor = new Object();
48
49 public void c() {
50 synchronized (monitor) {
51 Utils.sleep();
52 }
53 }
54
55 public void b() {
56 try {
57 synchronized (monitor) {
58 while (true) {
59 Thread.sleep(Long.MAX_VALUE);
60 }
61 }
62 } catch (InterruptedException e) {
63 c();
64 }
65 }
66
67 public void a() {
68 try {
69 synchronized (monitor) {
70 while (true) {
71 Thread.sleep(Long.MAX_VALUE);
72 }
73 }
74 } catch (InterruptedException e) {
75 b();
76 }
77 }
78
79 public void run() {
80 a();
81 }
82
83 }
84
85 public class TraveledLockTest {
86
87 public static void main(String[] args) throws Exception {
88 new TraveledLockTest().doTest();
89 }
90
91 private void doTest() throws Exception {
92 TraveledLockDebuggee debuggee = new TraveledLockDebuggee();
93
94 // Start in method a()
95 debuggee.start();
96
97 // Collect output from the jstack tool
98 JstackTool jstackTool = new JstackTool(ProcessHandle.current().getPid());
99 ToolResults results1 = jstackTool.measure();
100
101 // Go to method b()
102 debuggee.interrupt();
103
104 // Collect output from the jstack tool
105 ToolResults results2 = jstackTool.measure();
106
107 // Go to method c()
108 debuggee.interrupt();
109
110 // Collect output from the jstack tool
111 ToolResults results3 = jstackTool.measure();
112
113 analyse(results1.getStdoutString(), results2.getStdoutString(), results3.getStdoutString());
114 }
115
116 // Analyzsing the outputs from the 3 jstack runs
117 public void analyse(String results1, String results2, String results3) {
118
119 String jstackStr1 = results1;
120 String jstackStr2 = results2;
121 String jstackStr3 = results3;
122
123 if (jstackStr1 == null) {
124 throw new RuntimeException("First jstack output is empty");
125 }
126 if (jstackStr2 == null) {
127 throw new RuntimeException("Second jstack output is empty");
128 }
129 if (jstackStr3 == null) {
130 throw new RuntimeException("Third jstack output is empty");
131 }
132
133 Format format = new DefaultFormat();
134 JStack jstack1 = format.parse(jstackStr1);
135 JStack jstack2 = format.parse(jstackStr2);
136 JStack jstack3 = format.parse(jstackStr3);
137
138 ThreadStack ts1 = jstack1.getThreadStack(TraveledLockDebuggee.THREAD_NAME);
139 ThreadStack ts2 = jstack2.getThreadStack(TraveledLockDebuggee.THREAD_NAME);
140 ThreadStack ts3 = jstack3.getThreadStack(TraveledLockDebuggee.THREAD_NAME);
141
142 if (ts1 == null || ts2 == null || ts3 == null) {
143 throw new RuntimeException(
144 "One of thread stack trace is null in the first jstack output : "
145 + ts1 + ", " + ts2 + ", " + ts3);
146 }
147
148 MonitorInfo monitorInfo1 = null;
149 MonitorInfo monitorInfo2 = null;
150 MonitorInfo monitorInfo3 = null;
151
152 Iterator<MethodInfo> it = ts1.getStack().iterator();
153 while (it.hasNext()) {
154 MethodInfo mi = it.next();
155 if (mi.getName().startsWith(TraveledLockDebuggee.class.getName() + ".a")) {
156 monitorInfo1 = haveToHaveOneLock(mi);
157 }
158 }
159
160 it = ts2.getStack().iterator();
161 while (it.hasNext()) {
162 MethodInfo mi = it.next();
163 if (mi.getName().startsWith(TraveledLockDebuggee.class.getName() + ".a")) {
164 haveToBeEmpty(mi);
165 } else if (mi.getName().startsWith(TraveledLockDebuggee.class.getName() + ".b")) {
166 monitorInfo2 = haveToHaveOneLock(mi);
167 }
168 }
169
170 it = ts3.getStack().iterator();
171 while (it.hasNext()) {
172 MethodInfo mi = it.next();
173 if (mi.getName().startsWith(TraveledLockDebuggee.class.getName() + ".a")
174 || mi.getName().startsWith(TraveledLockDebuggee.class.getName() + ".b")) {
175 haveToBeEmpty(mi);
176 } else if (mi.getName().startsWith(TraveledLockDebuggee.class.getName() + ".c")) {
177 monitorInfo3 = haveToHaveOneLock(mi);
178 }
179 }
180
181 System.out.println("All monitors found - passed");
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 private void haveToBeEmpty(MethodInfo mi) {
197 if (mi.getLocks().size() == 0) {
198 System.out.println("Method \"" + mi.getName()
199 + "\" does not lock anything - correct");
200 } else {
201 throw new RuntimeException(
202 "Unexpected lock found in method \"" + mi.getName() + "\"");
203 }
204 }
205
206 }