J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 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 5047639 |
| 27 | * @summary Check that the "java-level" APIs provide a consistent view of |
| 28 | * the thread list |
| 29 | */ |
| 30 | import java.lang.management.ManagementFactory; |
| 31 | import java.lang.management.ThreadMXBean; |
| 32 | import java.util.Map; |
| 33 | |
| 34 | public class ThreadLists { |
| 35 | public static void main(String args[]) { |
| 36 | |
| 37 | // get top-level thread group |
| 38 | ThreadGroup top = Thread.currentThread().getThreadGroup(); |
| 39 | ThreadGroup parent; |
| 40 | do { |
| 41 | parent = top.getParent(); |
| 42 | if (parent != null) top = parent; |
| 43 | } while (parent != null); |
| 44 | |
| 45 | // get the thread count |
| 46 | int activeCount = top.activeCount(); |
| 47 | |
| 48 | Map<Thread, StackTraceElement[]> stackTraces = Thread.getAllStackTraces(); |
| 49 | |
| 50 | ThreadMXBean threadBean = ManagementFactory.getThreadMXBean(); |
| 51 | int threadCount = threadBean.getThreadCount(); |
| 52 | long[] threadIds = threadBean.getAllThreadIds(); |
| 53 | |
| 54 | System.out.println("ThreadGroup: " + activeCount + " active thread(s)"); |
| 55 | System.out.println("Thread: " + stackTraces.size() + " stack trace(s) returned"); |
| 56 | System.out.println("ThreadMXBean: " + threadCount + " live threads(s)"); |
| 57 | System.out.println("ThreadMXBean: " + threadIds.length + " thread Id(s)"); |
| 58 | |
| 59 | // check results are consistent |
| 60 | boolean failed = false; |
| 61 | if (activeCount != stackTraces.size()) failed = true; |
| 62 | if (activeCount != threadCount) failed = true; |
| 63 | if (activeCount != threadIds.length) failed = true; |
| 64 | |
| 65 | if (failed) { |
| 66 | throw new RuntimeException("inconsistent results"); |
| 67 | } |
| 68 | } |
| 69 | } |