97 lines
3.3 KiB
Java
97 lines
3.3 KiB
Java
/*
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* Copyright (c) 2003, 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 4858522
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* @summary Basic unit test of HotspotClassLoadingMBean.getSafepointCount()
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* @author Steve Bohne
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*
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* @run main/othervm -XX:+UsePerfData GetSafepointCount
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*/
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/*
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* This test is just a sanity check and does not check for the correct value.
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*/
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import sun.management.*;
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public class GetSafepointCount {
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private static HotspotRuntimeMBean mbean =
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(HotspotRuntimeMBean)ManagementFactoryHelper.getHotspotRuntimeMBean();
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private static final long NUM_THREAD_DUMPS = 5;
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// Careful with these values.
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private static final long MIN_VALUE_FOR_PASS = NUM_THREAD_DUMPS;
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private static final long MAX_VALUE_FOR_PASS = Long.MAX_VALUE;
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private static boolean trace = false;
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public static void main(String args[]) throws Exception {
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if (args.length > 0 && args[0].equals("trace")) {
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trace = true;
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}
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// Thread.getAllStackTraces() should cause safepoints.
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// If this test is failing because it doesn't,
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// MIN_VALUE_FOR_PASS should be reset to 0
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for (int i = 0; i < NUM_THREAD_DUMPS; i++) {
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Thread.getAllStackTraces();
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}
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long value = mbean.getSafepointCount();
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if (trace) {
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System.out.println("Safepoint count: " + value);
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}
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if (value < MIN_VALUE_FOR_PASS || value > MAX_VALUE_FOR_PASS) {
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throw new RuntimeException("Safepoint count " +
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"illegal value: " + value + " " +
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"(MIN = " + MIN_VALUE_FOR_PASS + "; " +
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"MAX = " + MAX_VALUE_FOR_PASS + ")");
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}
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for (int i = 0; i < NUM_THREAD_DUMPS; i++) {
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Thread.getAllStackTraces();
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}
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long value2 = mbean.getSafepointCount();
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if (trace) {
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System.out.println("Safepoint count2: " + value2);
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}
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if (value2 <= value) {
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throw new RuntimeException("Safepoint count " +
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"did not increase " +
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"(value = " + value + "; " +
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"value2 = " + value2 + ")");
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}
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System.out.println("Test passed.");
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}
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}
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