| /* |
| * Copyright 2003-2004 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| * CA 95054 USA or visit www.sun.com if you need additional information or |
| * have any questions. |
| */ |
| |
| /* |
| * @test |
| * @bug 4530538 |
| * @summary Basic unit test of ThreadMXBean.getAllThreadIds() |
| * @author Alexei Guibadoulline and Mandy Chung |
| * |
| * @run build Barrier |
| * @run main AllThreadIds |
| */ |
| |
| import java.lang.management.*; |
| import java.util.*; |
| |
| public class AllThreadIds { |
| final static int DAEMON_THREADS = 20; |
| final static int USER_THREADS = 5; |
| final static int ALL_THREADS = DAEMON_THREADS + USER_THREADS; |
| private static volatile boolean live[] = new boolean[ALL_THREADS]; |
| private static Thread allThreads[] = new Thread[ALL_THREADS]; |
| private static ThreadMXBean mbean |
| = ManagementFactory.getThreadMXBean(); |
| private static boolean testFailed = false; |
| private static boolean trace = false; |
| |
| private static long prevTotalThreadCount = 0; |
| private static int prevLiveThreadCount = 0; |
| private static int prevPeakThreadCount = 0; |
| private static long curTotalThreadCount = 0; |
| private static int curLiveThreadCount = 0; |
| private static int curPeakThreadCount = 0; |
| |
| // barrier for threads communication |
| private static Barrier barrier = new Barrier(ALL_THREADS); |
| |
| private static void printThreadList() { |
| if (!trace) return; |
| |
| long[] list = mbean.getAllThreadIds(); |
| for (int i = 1; i <= list.length; i++) { |
| System.out.println(i + ": Thread id = " + list[i-1]); |
| } |
| for (int i = 0; i < ALL_THREADS; i++) { |
| Thread t = allThreads[i]; |
| System.out.println(t.getName() + " Id = " + t.getId() + |
| " die = " + live[i] + |
| " alive = " + t.isAlive()); |
| } |
| } |
| |
| private static void checkThreadCount(int numNewThreads, |
| int numTerminatedThreads) |
| throws Exception { |
| prevTotalThreadCount = curTotalThreadCount; |
| prevLiveThreadCount = curLiveThreadCount; |
| prevPeakThreadCount = curPeakThreadCount; |
| curTotalThreadCount = mbean.getTotalStartedThreadCount(); |
| curLiveThreadCount = mbean.getThreadCount(); |
| curPeakThreadCount = mbean.getPeakThreadCount(); |
| |
| if ((curLiveThreadCount - prevLiveThreadCount) != |
| (numNewThreads - numTerminatedThreads)) { |
| throw new RuntimeException("Unexpected number of live threads: " + |
| " Prev Total = " + prevTotalThreadCount + |
| " Current Total = " + curTotalThreadCount + |
| " Threads added = " + numNewThreads + |
| " Threads terminated = " + numTerminatedThreads); |
| } |
| if (curPeakThreadCount - prevPeakThreadCount != numNewThreads) { |
| throw new RuntimeException("Unexpected number of peak threads: " + |
| " Prev Total = " + prevTotalThreadCount + |
| " Current Total = " + curTotalThreadCount + |
| " Threads added = " + numNewThreads); |
| } |
| if (curTotalThreadCount - prevTotalThreadCount != numNewThreads) { |
| throw new RuntimeException("Unexpected number of total threads: " + |
| " Prev Total = " + prevTotalThreadCount + |
| " Current Total = " + curTotalThreadCount + |
| " Threads added = " + numNewThreads); |
| } |
| long[] list = mbean.getAllThreadIds(); |
| if (list.length != curLiveThreadCount) { |
| throw new RuntimeException("Array length returned by " + |
| "getAllThreadIds() = " + list.length + |
| " not matched count = " + curLiveThreadCount); |
| } |
| } |
| |
| public static void main(String args[]) throws Exception { |
| if (args.length > 0 && args[0].equals("trace")) { |
| trace = true; |
| } |
| |
| curTotalThreadCount = mbean.getTotalStartedThreadCount(); |
| curLiveThreadCount = mbean.getThreadCount(); |
| curPeakThreadCount = mbean.getPeakThreadCount(); |
| checkThreadCount(0, 0); |
| |
| |
| // Start all threads and wait to be sure they all are alive |
| barrier.set(ALL_THREADS); |
| for (int i = 0; i < ALL_THREADS; i++) { |
| live[i] = true; |
| allThreads[i] = new MyThread(i); |
| allThreads[i].setDaemon( (i < DAEMON_THREADS) ? true : false); |
| allThreads[i].start(); |
| } |
| // wait until all threads are started. |
| barrier.await(); |
| |
| |
| checkThreadCount(ALL_THREADS, 0); |
| printThreadList(); |
| |
| // Check mbean now. All threads must appear in getAllThreadIds() list |
| long[] list = mbean.getAllThreadIds(); |
| |
| for (int i = 0; i < ALL_THREADS; i++) { |
| long expectedId = allThreads[i].getId(); |
| boolean found = false; |
| |
| if (trace) { |
| System.out.print("Looking for thread with id " + expectedId); |
| } |
| for (int j = 0; j < list.length; j++) { |
| if (expectedId == list[j]) { |
| found = true; |
| break; |
| } |
| } |
| |
| if (!found) { |
| testFailed = true; |
| } |
| if (trace) { |
| if (!found) { |
| System.out.print(". TEST FAILED."); |
| } |
| System.out.println(); |
| } |
| } |
| if (trace) { |
| System.out.println(); |
| } |
| |
| // Stop daemon threads, wait to be sure they all are dead, and check |
| // that they disappeared from getAllThreadIds() list |
| barrier.set(DAEMON_THREADS); |
| for (int i = 0; i < DAEMON_THREADS; i++) { |
| live[i] = false; |
| } |
| // wait until daemon threads are terminated. |
| barrier.await(); |
| |
| // give chance to threads to terminate |
| pause(); |
| checkThreadCount(0, DAEMON_THREADS); |
| |
| // Check mbean now |
| list = mbean.getAllThreadIds(); |
| |
| for (int i = 0; i < ALL_THREADS; i++) { |
| long expectedId = allThreads[i].getId(); |
| boolean found = false; |
| boolean live = (i >= DAEMON_THREADS); |
| |
| if (trace) { |
| System.out.print("Looking for thread with id " + expectedId + |
| (live ? " expected alive." : " expected terminated.")); |
| } |
| for (int j = 0; j < list.length; j++) { |
| if (expectedId == list[j]) { |
| found = true; |
| break; |
| } |
| } |
| |
| if (live != found) { |
| testFailed = true; |
| } |
| if (trace) { |
| if (live != found) { |
| System.out.println(" TEST FAILED."); |
| } else { |
| System.out.println(); |
| } |
| } |
| } |
| |
| // Stop all threads and wait to be sure they all are dead |
| barrier.set(ALL_THREADS - DAEMON_THREADS); |
| for (int i = DAEMON_THREADS; i < ALL_THREADS; i++) { |
| live[i] = false; |
| } |
| // wait until daemon threads are terminated . |
| barrier.await(); |
| |
| // give chance to threads to terminate |
| pause(); |
| checkThreadCount(0, ALL_THREADS - DAEMON_THREADS); |
| |
| if (testFailed) |
| throw new RuntimeException("TEST FAILED."); |
| |
| System.out.println("Test passed."); |
| } |
| |
| // The MyThread thread lives as long as correspondent live[i] value is true |
| private static class MyThread extends Thread { |
| int id; |
| |
| MyThread(int id) { |
| this.id = id; |
| } |
| |
| public void run() { |
| // signal started |
| barrier.signal(); |
| while (live[id]) { |
| try { |
| sleep(100); |
| } catch (InterruptedException e) { |
| System.out.println("Unexpected exception is thrown."); |
| e.printStackTrace(System.out); |
| testFailed = true; |
| } |
| } |
| // signal about to exit |
| barrier.signal(); |
| } |
| } |
| |
| private static Object pauseObj = new Object(); |
| private static void pause() { |
| // Enter lock a without blocking |
| synchronized (pauseObj) { |
| try { |
| // may need to tune this timeout for different platforms |
| pauseObj.wait(50); |
| } catch (Exception e) { |
| System.err.println("Unexpected exception."); |
| e.printStackTrace(System.err); |
| } |
| } |
| } |
| |
| } |