J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 2003-2004 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| 20 | * CA 95054 USA or visit www.sun.com if you need additional information or |
| 21 | * have any questions. |
| 22 | */ |
| 23 | |
| 24 | /* |
| 25 | * @test |
| 26 | * @bug 4530538 |
| 27 | * @summary Basic unit test of ThreadMXBean.getAllThreadIds() |
| 28 | * @author Alexei Guibadoulline and Mandy Chung |
| 29 | * |
| 30 | * @run build Barrier |
| 31 | * @run main AllThreadIds |
| 32 | */ |
| 33 | |
| 34 | import java.lang.management.*; |
| 35 | import java.util.*; |
| 36 | |
| 37 | public class AllThreadIds { |
| 38 | final static int DAEMON_THREADS = 20; |
| 39 | final static int USER_THREADS = 5; |
| 40 | final static int ALL_THREADS = DAEMON_THREADS + USER_THREADS; |
| 41 | private static volatile boolean live[] = new boolean[ALL_THREADS]; |
| 42 | private static Thread allThreads[] = new Thread[ALL_THREADS]; |
| 43 | private static ThreadMXBean mbean |
| 44 | = ManagementFactory.getThreadMXBean(); |
| 45 | private static boolean testFailed = false; |
| 46 | private static boolean trace = false; |
| 47 | |
| 48 | private static long prevTotalThreadCount = 0; |
| 49 | private static int prevLiveThreadCount = 0; |
| 50 | private static int prevPeakThreadCount = 0; |
| 51 | private static long curTotalThreadCount = 0; |
| 52 | private static int curLiveThreadCount = 0; |
| 53 | private static int curPeakThreadCount = 0; |
| 54 | |
| 55 | // barrier for threads communication |
| 56 | private static Barrier barrier = new Barrier(ALL_THREADS); |
| 57 | |
| 58 | private static void printThreadList() { |
| 59 | if (!trace) return; |
| 60 | |
| 61 | long[] list = mbean.getAllThreadIds(); |
| 62 | for (int i = 1; i <= list.length; i++) { |
| 63 | System.out.println(i + ": Thread id = " + list[i-1]); |
| 64 | } |
| 65 | for (int i = 0; i < ALL_THREADS; i++) { |
| 66 | Thread t = allThreads[i]; |
| 67 | System.out.println(t.getName() + " Id = " + t.getId() + |
| 68 | " die = " + live[i] + |
| 69 | " alive = " + t.isAlive()); |
| 70 | } |
| 71 | } |
| 72 | |
| 73 | private static void checkThreadCount(int numNewThreads, |
| 74 | int numTerminatedThreads) |
| 75 | throws Exception { |
| 76 | prevTotalThreadCount = curTotalThreadCount; |
| 77 | prevLiveThreadCount = curLiveThreadCount; |
| 78 | prevPeakThreadCount = curPeakThreadCount; |
| 79 | curTotalThreadCount = mbean.getTotalStartedThreadCount(); |
| 80 | curLiveThreadCount = mbean.getThreadCount(); |
| 81 | curPeakThreadCount = mbean.getPeakThreadCount(); |
| 82 | |
| 83 | if ((curLiveThreadCount - prevLiveThreadCount) != |
| 84 | (numNewThreads - numTerminatedThreads)) { |
| 85 | throw new RuntimeException("Unexpected number of live threads: " + |
| 86 | " Prev Total = " + prevTotalThreadCount + |
| 87 | " Current Total = " + curTotalThreadCount + |
| 88 | " Threads added = " + numNewThreads + |
| 89 | " Threads terminated = " + numTerminatedThreads); |
| 90 | } |
| 91 | if (curPeakThreadCount - prevPeakThreadCount != numNewThreads) { |
| 92 | throw new RuntimeException("Unexpected number of peak threads: " + |
| 93 | " Prev Total = " + prevTotalThreadCount + |
| 94 | " Current Total = " + curTotalThreadCount + |
| 95 | " Threads added = " + numNewThreads); |
| 96 | } |
| 97 | if (curTotalThreadCount - prevTotalThreadCount != numNewThreads) { |
| 98 | throw new RuntimeException("Unexpected number of total threads: " + |
| 99 | " Prev Total = " + prevTotalThreadCount + |
| 100 | " Current Total = " + curTotalThreadCount + |
| 101 | " Threads added = " + numNewThreads); |
| 102 | } |
| 103 | long[] list = mbean.getAllThreadIds(); |
| 104 | if (list.length != curLiveThreadCount) { |
| 105 | throw new RuntimeException("Array length returned by " + |
| 106 | "getAllThreadIds() = " + list.length + |
| 107 | " not matched count = " + curLiveThreadCount); |
| 108 | } |
| 109 | } |
| 110 | |
| 111 | public static void main(String args[]) throws Exception { |
| 112 | if (args.length > 0 && args[0].equals("trace")) { |
| 113 | trace = true; |
| 114 | } |
| 115 | |
| 116 | curTotalThreadCount = mbean.getTotalStartedThreadCount(); |
| 117 | curLiveThreadCount = mbean.getThreadCount(); |
| 118 | curPeakThreadCount = mbean.getPeakThreadCount(); |
| 119 | checkThreadCount(0, 0); |
| 120 | |
| 121 | |
| 122 | // Start all threads and wait to be sure they all are alive |
| 123 | barrier.set(ALL_THREADS); |
| 124 | for (int i = 0; i < ALL_THREADS; i++) { |
| 125 | live[i] = true; |
| 126 | allThreads[i] = new MyThread(i); |
| 127 | allThreads[i].setDaemon( (i < DAEMON_THREADS) ? true : false); |
| 128 | allThreads[i].start(); |
| 129 | } |
| 130 | // wait until all threads are started. |
| 131 | barrier.await(); |
| 132 | |
| 133 | |
| 134 | checkThreadCount(ALL_THREADS, 0); |
| 135 | printThreadList(); |
| 136 | |
| 137 | // Check mbean now. All threads must appear in getAllThreadIds() list |
| 138 | long[] list = mbean.getAllThreadIds(); |
| 139 | |
| 140 | for (int i = 0; i < ALL_THREADS; i++) { |
| 141 | long expectedId = allThreads[i].getId(); |
| 142 | boolean found = false; |
| 143 | |
| 144 | if (trace) { |
| 145 | System.out.print("Looking for thread with id " + expectedId); |
| 146 | } |
| 147 | for (int j = 0; j < list.length; j++) { |
| 148 | if (expectedId == list[j]) { |
| 149 | found = true; |
| 150 | break; |
| 151 | } |
| 152 | } |
| 153 | |
| 154 | if (!found) { |
| 155 | testFailed = true; |
| 156 | } |
| 157 | if (trace) { |
| 158 | if (!found) { |
| 159 | System.out.print(". TEST FAILED."); |
| 160 | } |
| 161 | System.out.println(); |
| 162 | } |
| 163 | } |
| 164 | if (trace) { |
| 165 | System.out.println(); |
| 166 | } |
| 167 | |
| 168 | // Stop daemon threads, wait to be sure they all are dead, and check |
| 169 | // that they disappeared from getAllThreadIds() list |
| 170 | barrier.set(DAEMON_THREADS); |
| 171 | for (int i = 0; i < DAEMON_THREADS; i++) { |
| 172 | live[i] = false; |
| 173 | } |
| 174 | // wait until daemon threads are terminated. |
| 175 | barrier.await(); |
| 176 | |
| 177 | // give chance to threads to terminate |
| 178 | pause(); |
| 179 | checkThreadCount(0, DAEMON_THREADS); |
| 180 | |
| 181 | // Check mbean now |
| 182 | list = mbean.getAllThreadIds(); |
| 183 | |
| 184 | for (int i = 0; i < ALL_THREADS; i++) { |
| 185 | long expectedId = allThreads[i].getId(); |
| 186 | boolean found = false; |
| 187 | boolean live = (i >= DAEMON_THREADS); |
| 188 | |
| 189 | if (trace) { |
| 190 | System.out.print("Looking for thread with id " + expectedId + |
| 191 | (live ? " expected alive." : " expected terminated.")); |
| 192 | } |
| 193 | for (int j = 0; j < list.length; j++) { |
| 194 | if (expectedId == list[j]) { |
| 195 | found = true; |
| 196 | break; |
| 197 | } |
| 198 | } |
| 199 | |
| 200 | if (live != found) { |
| 201 | testFailed = true; |
| 202 | } |
| 203 | if (trace) { |
| 204 | if (live != found) { |
| 205 | System.out.println(" TEST FAILED."); |
| 206 | } else { |
| 207 | System.out.println(); |
| 208 | } |
| 209 | } |
| 210 | } |
| 211 | |
| 212 | // Stop all threads and wait to be sure they all are dead |
| 213 | barrier.set(ALL_THREADS - DAEMON_THREADS); |
| 214 | for (int i = DAEMON_THREADS; i < ALL_THREADS; i++) { |
| 215 | live[i] = false; |
| 216 | } |
| 217 | // wait until daemon threads are terminated . |
| 218 | barrier.await(); |
| 219 | |
| 220 | // give chance to threads to terminate |
| 221 | pause(); |
| 222 | checkThreadCount(0, ALL_THREADS - DAEMON_THREADS); |
| 223 | |
| 224 | if (testFailed) |
| 225 | throw new RuntimeException("TEST FAILED."); |
| 226 | |
| 227 | System.out.println("Test passed."); |
| 228 | } |
| 229 | |
| 230 | // The MyThread thread lives as long as correspondent live[i] value is true |
| 231 | private static class MyThread extends Thread { |
| 232 | int id; |
| 233 | |
| 234 | MyThread(int id) { |
| 235 | this.id = id; |
| 236 | } |
| 237 | |
| 238 | public void run() { |
| 239 | // signal started |
| 240 | barrier.signal(); |
| 241 | while (live[id]) { |
| 242 | try { |
| 243 | sleep(100); |
| 244 | } catch (InterruptedException e) { |
| 245 | System.out.println("Unexpected exception is thrown."); |
| 246 | e.printStackTrace(System.out); |
| 247 | testFailed = true; |
| 248 | } |
| 249 | } |
| 250 | // signal about to exit |
| 251 | barrier.signal(); |
| 252 | } |
| 253 | } |
| 254 | |
| 255 | private static Object pauseObj = new Object(); |
| 256 | private static void pause() { |
| 257 | // Enter lock a without blocking |
| 258 | synchronized (pauseObj) { |
| 259 | try { |
| 260 | // may need to tune this timeout for different platforms |
| 261 | pauseObj.wait(50); |
| 262 | } catch (Exception e) { |
| 263 | System.err.println("Unexpected exception."); |
| 264 | e.printStackTrace(System.err); |
| 265 | } |
| 266 | } |
| 267 | } |
| 268 | |
| 269 | } |