102 lines
3.2 KiB
Java
102 lines
3.2 KiB
Java
/*
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* Copyright (c) 2013, 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 8019623
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* @summary Tests that AppContext.getAppContext() works correctly in multi-threads scenario.
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* @author Leonid Romanov
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* @modules java.desktop/sun.awt
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*/
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import sun.awt.AppContext;
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public class MultiThreadTest {
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private static final int NUM_THREADS = 2;
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private static AppContextGetter[] getters = new AppContextGetter[NUM_THREADS];
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public static void main(String[] args) {
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createAndStartThreads();
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compareAppContexts();
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}
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private static void createAndStartThreads() {
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ThreadGroup systemGroup = getSystemThreadGroup();
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for (int i = 0; i < NUM_THREADS; ++i) {
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ThreadGroup tg = new ThreadGroup(systemGroup, "AppContextGetter" + i);
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getters[i] = new AppContextGetter(tg);
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}
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for (int i = 0; i < NUM_THREADS; ++i) {
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getters[i].start();
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}
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for (int i = 0; i < NUM_THREADS; ++i) {
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try {
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getters[i].join();
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} catch (InterruptedException e) {
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// ignore
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}
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}
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}
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private static ThreadGroup getSystemThreadGroup() {
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ThreadGroup currentThreadGroup =
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Thread.currentThread().getThreadGroup();
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ThreadGroup parentThreadGroup = currentThreadGroup.getParent();
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while (parentThreadGroup != null) {
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currentThreadGroup = parentThreadGroup;
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parentThreadGroup = currentThreadGroup.getParent();
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}
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return currentThreadGroup;
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}
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private static void compareAppContexts() {
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AppContext ctx = getters[0].getAppContext();
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for (int i = 1; i < NUM_THREADS; ++i) {
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if (!ctx.equals(getters[i].getAppContext())) {
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throw new RuntimeException("Unexpected AppContexts difference, could be a race condition");
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}
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}
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}
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private static class AppContextGetter extends Thread {
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private AppContext appContext;
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public AppContextGetter(ThreadGroup tg) {
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super(tg, tg.getName());
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}
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AppContext getAppContext() {
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return appContext;
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}
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@Override
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public void run() {
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appContext = AppContext.getAppContext();
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}
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}
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}
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