1 /*
2 * Copyright (c) 2011, 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 * @bug 6173675
27 * @summary Basic test of ThreadMXBean.getThreadAllocatedBytes(long[])
28 * @author Paul Hohensee
29 * @modules jdk.management
30 */
31
32 import java.lang.management.*;
33
34 public class ThreadAllocatedMemoryArray {
35 private static com.sun.management.ThreadMXBean mbean =
36 (com.sun.management.ThreadMXBean)ManagementFactory.getThreadMXBean();
37 private static boolean testFailed = false;
38 private static boolean done = false;
39 private static boolean done1 = false;
40 private static Object obj = new Object();
41 private static final int NUM_THREADS = 10;
42 private static Thread[] threads = new Thread[NUM_THREADS];
43
44 public static void main(String[] argv)
45 throws Exception {
46
47 if (!mbean.isThreadAllocatedMemorySupported()) {
48 return;
49 }
50
51
52 // start threads, wait for them to block
53 long[] ids = new long[NUM_THREADS];
54
55 for (int i = 0; i < NUM_THREADS; i++) {
56 threads[i] = new MyThread("MyThread-" + i);
57 threads[i].start();
58 ids[i] = threads[i].getId();
59 }
60
61 waitUntilThreadBlocked();
62
63
64 // disable allocated memory measurement
65 if (mbean.isThreadAllocatedMemoryEnabled()) {
66 mbean.setThreadAllocatedMemoryEnabled(false);
67 }
68
69 if (mbean.isThreadAllocatedMemoryEnabled()) {
70 throw new RuntimeException(
71 "ThreadAllocatedMemory is expected to be disabled");
72 }
73
74 long sizes[] = mbean.getThreadAllocatedBytes(ids);
75
76 if (sizes == null) {
77 throw new RuntimeException("Null ThreadAllocatedBytes array returned");
78 }
79
80 for (int i = 0; i < NUM_THREADS; i++) {
81 long s = sizes[i];
82 if (s != -1) {
83 throw new RuntimeException(
84 "Invalid ThreadAllocatedBytes returned for thread " +
85 threads[i].getName() + " = " + s + " expected = -1");
86 }
87 }
88
89 // Enable allocated memory measurement
90 if (!mbean.isThreadAllocatedMemoryEnabled()) {
91 mbean.setThreadAllocatedMemoryEnabled(true);
92 }
93
94 if (!mbean.isThreadAllocatedMemoryEnabled()) {
95 throw new RuntimeException(
96 "ThreadAllocatedMemory is expected to be enabled");
97 }
98
99 sizes = mbean.getThreadAllocatedBytes(ids);
100
101 for (int i = 0; i < NUM_THREADS; i++) {
102 long s = sizes[i];
103 if (s < 0) {
104 throw new RuntimeException(
105 "Invalid allocated bytes returned for thread " +
106 threads[i].getName() + " = " + s);
107 }
108 }
109
110 // let threads go and do some more allocation
111 synchronized (obj) {
112 done = true;
113 obj.notifyAll();
114 }
115
116 // wait for threads to get going again. we don't care if we
117 // catch them in mid-execution or if some of them haven't
118 // restarted after we're done sleeping.
119 goSleep(400);
120
121 long[] sizes1 = mbean.getThreadAllocatedBytes(ids);
122
123 for (int i = 0; i < NUM_THREADS; i++) {
124 long newSize = sizes1[i];
125 if (sizes[i] > newSize) {
126 throw new RuntimeException("TEST FAILED: " +
127 threads[i].getName() +
128 " previous allocated bytes = " + sizes[i] +
129 " > current allocated bytes = " + newSize);
130 }
131 System.out.println(threads[i].getName() +
132 " Previous allocated bytes = " + sizes[i] +
133 " Current allocated bytes = " + newSize);
134 }
135
136 try {
137 sizes = mbean.getThreadAllocatedBytes(null);
138 } catch (NullPointerException e) {
139 System.out.println(
140 "Caught expected NullPointerException: " + e.getMessage());
141 }
142
143 try {
144 ids[0] = 0;
145 sizes = mbean.getThreadAllocatedBytes(ids);
146 } catch (IllegalArgumentException e) {
147 System.out.println(
148 "Caught expected IllegalArgumentException: " + e.getMessage());
149 }
150
151
152 // let threads exit
153 synchronized (obj) {
154 done1 = true;
155 obj.notifyAll();
156 }
157
158 for (int i = 0; i < NUM_THREADS; i++) {
159 try {
160 threads[i].join();
161 } catch (InterruptedException e) {
162 System.out.println("Unexpected exception is thrown.");
163 e.printStackTrace(System.out);
164 testFailed = true;
165 break;
166 }
167 }
168
169 if (testFailed) {
170 throw new RuntimeException("TEST FAILED");
171 }
172
173 System.out.println("Test passed");
174 }
175
176
177 private static void goSleep(long ms) throws Exception {
178 try {
179 Thread.sleep(ms);
180 } catch (InterruptedException e) {
181 System.out.println("Unexpected exception is thrown.");
182 throw e;
183 }
184 }
185
186 private static void waitUntilThreadBlocked()
187 throws Exception {
188 int count = 0;
189 while (count != NUM_THREADS) {
190 goSleep(100);
191 count = 0;
192 for (int i = 0; i < NUM_THREADS; i++) {
193 ThreadInfo info = mbean.getThreadInfo(threads[i].getId());
194 if (info.getThreadState() == Thread.State.WAITING) {
195 count++;
196 }
197 }
198 }
199 }
200
201 public static void doit() {
202 String tmp = "";
203 long hashCode = 0;
204 for (int counter = 0; counter < 1000; counter++) {
205 tmp += counter;
206 hashCode = tmp.hashCode();
207 }
208 System.out.println(Thread.currentThread().getName() +
209 " hashcode: " + hashCode);
210 }
211
212 static class MyThread extends Thread {
213 public MyThread(String name) {
214 super(name);
215 }
216
217 public void run() {
218 ThreadAllocatedMemoryArray.doit();
219
220 synchronized (obj) {
221 while (!done) {
222 try {
223 obj.wait();
224 } catch (InterruptedException e) {
225 System.out.println("Unexpected exception is thrown.");
226 e.printStackTrace(System.out);
227 testFailed = true;
228 break;
229 }
230 }
231 }
232
233 ThreadAllocatedMemoryArray.doit();
234
235 synchronized (obj) {
236 while (!done1) {
237 try {
238 obj.wait();
239 } catch (InterruptedException e) {
240 System.out.println("Unexpected exception is thrown.");
241 e.printStackTrace(System.out);
242 testFailed = true;
243 break;
244 }
245 }
246 }
247
248 }
249 }
250 }