1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
|
/*
* Copyright (c) 2003, 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.
*/
/*
* @test
* @bug 4967283 5080203 8022208
* @summary Basic unit test of thread states returned by
* ThreadMXBean.getThreadInfo.getThreadState().
* It also tests lock information returned by ThreadInfo.
* @author Mandy Chung
*
* @library ../../Thread
* @library /lib/testlibrary
* @library /test/lib
*
* @build jdk.testlibrary.*
* @build ThreadMXBeanStateTest ThreadStateController
* @run main ThreadMXBeanStateTest
*/
import java.lang.management.ManagementFactory;
import java.lang.management.ThreadMXBean;
import java.lang.management.ThreadInfo;
import static java.lang.Thread.State.*;
public class ThreadMXBeanStateTest {
private static final ThreadMXBean tm = ManagementFactory.getThreadMXBean();
static class Lock {
private final String name;
Lock(String name) {
this.name = name;
}
@Override
public String toString() {
return name;
}
}
private static final Lock globalLock = new Lock("my lock");
public static void main(String[] argv) throws Exception {
// Force thread state initialization now before the test
// verification begins.
Thread.currentThread().getState();
ThreadStateController thread = new ThreadStateController("StateChanger", globalLock);
thread.setDaemon(true);
try {
// before myThread starts
thread.checkThreadState(NEW);
thread.start();
thread.transitionTo(RUNNABLE);
thread.checkThreadState(RUNNABLE);
checkLockInfo(thread, RUNNABLE, null, null);
thread.suspend();
ThreadStateController.pause(10);
thread.checkThreadState(RUNNABLE);
checkSuspendedThreadState(thread, RUNNABLE);
thread.resume();
synchronized (globalLock) {
thread.transitionTo(BLOCKED);
thread.checkThreadState(BLOCKED);
checkLockInfo(thread, BLOCKED,
globalLock, Thread.currentThread());
}
thread.transitionTo(WAITING);
thread.checkThreadState(WAITING);
checkLockInfo(thread, Thread.State.WAITING,
globalLock, null);
thread.transitionTo(TIMED_WAITING);
thread.checkThreadState(TIMED_WAITING);
checkLockInfo(thread, TIMED_WAITING,
globalLock, null);
thread.transitionToPark(true /* timed park */);
thread.checkThreadState(TIMED_WAITING);
checkLockInfo(thread, TIMED_WAITING, null, null);
thread.transitionToPark(false /* indefinite park */);
thread.checkThreadState(WAITING);
checkLockInfo(thread, WAITING, null, null);
thread.transitionToSleep();
thread.checkThreadState(TIMED_WAITING);
checkLockInfo(thread, TIMED_WAITING, null, null);
thread.transitionTo(TERMINATED);
thread.checkThreadState(TERMINATED);
} finally {
try {
System.out.println(thread.getLog());
} catch (InterruptedException e) {
e.printStackTrace();
System.out.println("TEST FAILED: Unexpected exception.");
throw new RuntimeException(e);
}
}
System.out.println("Test passed.");
}
private static void checkSuspendedThreadState(ThreadStateController t, Thread.State state) {
ThreadInfo info = getThreadInfo(t, state);
if (info == null) {
throw new RuntimeException(t.getName() +
" expected to have ThreadInfo " +
" but got null.");
}
if (info.getThreadState() != state) {
throw new RuntimeException(t.getName() + " expected to be in " +
state + " state but got " + info.getThreadState());
}
if (!info.isSuspended()) {
throw new RuntimeException(t.getName() + " expected to be suspended " +
" but isSuspended() returns " + info.isSuspended());
}
}
private static String getLockName(Object lock) {
if (lock == null) return null;
return lock.getClass().getName() + '@' +
Integer.toHexString(System.identityHashCode(lock));
}
// maximum number of retries when checking for thread state.
private static final int MAX_RETRY = 500;
private static ThreadInfo getThreadInfo(ThreadStateController t, Thread.State expected) {
// wait for the thread to transition to the expected state.
// There is a small window between the thread checking the state
// and the thread actual entering that state.
int retryCount=0;
ThreadInfo info = tm.getThreadInfo(t.getId());
while (info.getThreadState() != expected && retryCount < MAX_RETRY) {
ThreadStateController.pause(10);
retryCount++;
info = tm.getThreadInfo(t.getId());
}
return info;
}
private static void checkLockInfo(ThreadStateController t, Thread.State state,
Object lock, Thread owner) {
ThreadInfo info = getThreadInfo(t, state);
if (info == null) {
throw new RuntimeException(t.getName() +
" expected to have ThreadInfo " +
" but got null.");
}
if (info.getThreadState() != state) {
throw new RuntimeException(t.getName() + " expected to be in " +
state + " state but got " + info.getThreadState());
}
if (lock == null && info.getLockName() != null) {
throw new RuntimeException(t.getName() +
" expected not to be blocked on any lock" +
" but got " + info.getLockName());
}
String expectedLockName = getLockName(lock);
if (lock != null && info.getLockName() == null) {
throw new RuntimeException(t.getName() +
" expected to be blocked on lock [" + expectedLockName +
"] but got null.");
}
if (lock != null && !expectedLockName.equals(info.getLockName())) {
throw new RuntimeException(t.getName() +
" expected to be blocked on lock [" + expectedLockName +
"] but got [" + info.getLockName() + "].");
}
if (owner == null && info.getLockOwnerName() != null) {
throw new RuntimeException("Lock owner is expected " +
" to be null but got " + info.getLockOwnerName());
}
if (owner != null && info.getLockOwnerName() == null) {
throw new RuntimeException("Lock owner is expected to be " +
owner.getName() +
" but got null.");
}
if (owner != null && !info.getLockOwnerName().equals(owner.getName())) {
throw new RuntimeException("Lock owner is expected to be " +
owner.getName() +
" but got " + owner.getName());
}
if (owner == null && info.getLockOwnerId() != -1) {
throw new RuntimeException("Lock owner is expected " +
" to be -1 but got " + info.getLockOwnerId());
}
if (owner != null && info.getLockOwnerId() <= 0) {
throw new RuntimeException("Lock owner is expected to be " +
owner.getName() + "(id = " + owner.getId() +
") but got " + info.getLockOwnerId());
}
if (owner != null && info.getLockOwnerId() != owner.getId()) {
throw new RuntimeException("Lock owner is expected to be " +
owner.getName() + "(id = " + owner.getId() +
") but got " + info.getLockOwnerId());
}
if (info.isSuspended()) {
throw new RuntimeException(t.getName() +
" isSuspended() returns " + info.isSuspended());
}
}
}
|
