75 lines
2.8 KiB
Java
75 lines
2.8 KiB
Java
/*
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* Copyright (c) 2004, 2015, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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/*
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* @test
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* @bug 5047639
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* @summary Check that the "java-level" APIs provide a consistent view of
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* the thread list
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*/
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import java.lang.management.ManagementFactory;
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import java.lang.management.ThreadMXBean;
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import java.util.Map;
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public class ThreadLists {
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public static void main(String args[]) {
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// Bug id : JDK-8151797
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// Use a lambda expression so that call-site cleaner thread is started
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Runnable printLambda = () -> {System.out.println("Starting Test");};
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printLambda.run();
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// get top-level thread group
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ThreadGroup top = Thread.currentThread().getThreadGroup();
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ThreadGroup parent;
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do {
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parent = top.getParent();
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if (parent != null) top = parent;
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} while (parent != null);
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// get the thread count
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int activeCount = top.activeCount();
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Map<Thread, StackTraceElement[]> stackTraces = Thread.getAllStackTraces();
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ThreadMXBean threadBean = ManagementFactory.getThreadMXBean();
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int threadCount = threadBean.getThreadCount();
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long[] threadIds = threadBean.getAllThreadIds();
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System.out.println("ThreadGroup: " + activeCount + " active thread(s)");
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System.out.println("Thread: " + stackTraces.size() + " stack trace(s) returned");
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System.out.println("ThreadMXBean: " + threadCount + " live threads(s)");
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System.out.println("ThreadMXBean: " + threadIds.length + " thread Id(s)");
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// check results are consistent
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boolean failed = false;
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if (activeCount != stackTraces.size()) failed = true;
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if (activeCount != threadCount) failed = true;
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if (activeCount != threadIds.length) failed = true;
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if (failed) {
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throw new RuntimeException("inconsistent results");
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}
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}
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}
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