1 /*
2 * Copyright (c) 2011, 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 * @bug 6173675
27 * @summary Basic test of ThreadMXBean.getThreadAllocatedBytes(long[])
28 * @author Paul Hohensee
29 */
30
31 import java.lang.management.*;
32
33 public class ThreadAllocatedMemoryArray {
34 private static com.sun.management.ThreadMXBean mbean =
35 (com.sun.management.ThreadMXBean)ManagementFactory.getThreadMXBean();
36 private static boolean testFailed = false;
37 private static boolean done = false;
38 private static boolean done1 = false;
39 private static Object obj = new Object();
40 private static final int NUM_THREADS = 10;
41 private static Thread[] threads = new Thread[NUM_THREADS];
42
43 public static void main(String[] argv)
44 throws Exception {
45
46 if (!mbean.isThreadAllocatedMemorySupported()) {
47 return;
48 }
49
50
51 // start threads, wait for them to block
52 long[] ids = new long[NUM_THREADS];
53
54 for (int i = 0; i < NUM_THREADS; i++) {
55 threads[i] = new MyThread("MyThread-" + i);
56 threads[i].start();
57 ids[i] = threads[i].getId();
58 }
59
60 waitUntilThreadBlocked();
61
62
63 // disable allocated memory measurement
64 if (mbean.isThreadAllocatedMemoryEnabled()) {
65 mbean.setThreadAllocatedMemoryEnabled(false);
66 }
67
68 if (mbean.isThreadAllocatedMemoryEnabled()) {
69 throw new RuntimeException(
70 "ThreadAllocatedMemory is expected to be disabled");
71 }
72
73 long sizes[] = mbean.getThreadAllocatedBytes(ids);
74
75 if (sizes == null) {
76 throw new RuntimeException("Null ThreadAllocatedBytes array returned");
77 }
78
79 for (int i = 0; i < NUM_THREADS; i++) {
80 long s = sizes[i];
81 if (s != -1) {
82 throw new RuntimeException(
83 "Invalid ThreadAllocatedBytes returned for thread " +
84 threads[i].getName() + " = " + s + " expected = -1");
85 }
86 }
87
88 // Enable allocated memory measurement
89 if (!mbean.isThreadAllocatedMemoryEnabled()) {
90 mbean.setThreadAllocatedMemoryEnabled(true);
91 }
92
93 if (!mbean.isThreadAllocatedMemoryEnabled()) {
94 throw new RuntimeException(
95 "ThreadAllocatedMemory is expected to be enabled");
96 }
97
98 sizes = mbean.getThreadAllocatedBytes(ids);
99
100 for (int i = 0; i < NUM_THREADS; i++) {
101 long s = sizes[i];
102 if (s < 0) {
103 throw new RuntimeException(
104 "Invalid allocated bytes returned for thread " +
105 threads[i].getName() + " = " + s);
106 }
107 }
108
109 // let threads go and do some more allocation
110 synchronized (obj) {
111 done = true;
112 obj.notifyAll();
113 }
114
115 // wait for threads to get going again. we don't care if we
116 // catch them in mid-execution or if some of them haven't
117 // restarted after we're done sleeping.
118 goSleep(400);
119
120 long[] sizes1 = mbean.getThreadAllocatedBytes(ids);
121
122 for (int i = 0; i < NUM_THREADS; i++) {
123 long newSize = sizes1[i];
124 if (sizes[i] > newSize) {
125 throw new RuntimeException("TEST FAILED: " +
126 threads[i].getName() +
127 " previous allocated bytes = " + sizes[i] +
128 " > current allocated bytes = " + newSize);
129 }
130 System.out.println(threads[i].getName() +
131 " Previous allocated bytes = " + sizes[i] +
132 " Current allocated bytes = " + newSize);
133 }
134
135 try {
136 sizes = mbean.getThreadAllocatedBytes(null);
137 } catch (NullPointerException e) {
138 System.out.println(
139 "Caught expected NullPointerException: " + e.getMessage());
140 }
141
142 try {
143 ids[0] = 0;
144 sizes = mbean.getThreadAllocatedBytes(ids);
145 } catch (IllegalArgumentException e) {
146 System.out.println(
147 "Caught expected IllegalArgumentException: " + e.getMessage());
148 }
149
150
151 // let threads exit
152 synchronized (obj) {
153 done1 = true;
154 obj.notifyAll();
155 }
156
157 for (int i = 0; i < NUM_THREADS; i++) {
158 try {
159 threads[i].join();
160 } catch (InterruptedException e) {
161 System.out.println("Unexpected exception is thrown.");
162 e.printStackTrace(System.out);
163 testFailed = true;
164 break;
165 }
166 }
167
168 if (testFailed) {
169 throw new RuntimeException("TEST FAILED");
170 }
171
172 System.out.println("Test passed");
173 }
174
175
176 private static void goSleep(long ms) throws Exception {
177 try {
178 Thread.sleep(ms);
179 } catch (InterruptedException e) {
180 System.out.println("Unexpected exception is thrown.");
181 throw e;
182 }
183 }
184
185 private static void waitUntilThreadBlocked()
186 throws Exception {
187 int count = 0;
188 while (count != NUM_THREADS) {
189 goSleep(100);
190 count = 0;
191 for (int i = 0; i < NUM_THREADS; i++) {
192 ThreadInfo info = mbean.getThreadInfo(threads[i].getId());
193 if (info.getThreadState() == Thread.State.WAITING) {
194 count++;
195 }
196 }
197 }
198 }
199
200 public static void doit() {
201 String tmp = "";
202 long hashCode = 0;
203 for (int counter = 0; counter < 1000; counter++) {
204 tmp += counter;
205 hashCode = tmp.hashCode();
206 }
207 System.out.println(Thread.currentThread().getName() +
208 " hashcode: " + hashCode);
209 }
210
211 static class MyThread extends Thread {
212 public MyThread(String name) {
213 super(name);
214 }
215
216 public void run() {
217 ThreadAllocatedMemoryArray.doit();
218
219 synchronized (obj) {
220 while (!done) {
221 try {
222 obj.wait();
223 } catch (InterruptedException e) {
224 System.out.println("Unexpected exception is thrown.");
225 e.printStackTrace(System.out);
226 testFailed = true;
227 break;
228 }
229 }
230 }
231
232 ThreadAllocatedMemoryArray.doit();
233
234 synchronized (obj) {
235 while (!done1) {
236 try {
237 obj.wait();
238 } catch (InterruptedException e) {
239 System.out.println("Unexpected exception is thrown.");
240 e.printStackTrace(System.out);
241 testFailed = true;
242 break;
243 }
244 }
245 }
246
247 }
248 }
249 }