1 /*
   2  * Copyright (c) 2014, 2016, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  */
  23 
  24 import java.awt.Window;
  25 
  26 /**
  27  * @test
  28  * @key headful
  29  * @bug 8064468
  30  * @author Alexander Scherbatiy
  31  * @summary ownedWindowList access requires synchronization in
  32  *     Window.setAlwaysOnTop() method
  33  * @run main SyncAlwaysOnTopFieldTest
  34  */
  35 public class SyncAlwaysOnTopFieldTest {
  36 
  37     private static final int WINDOWS_COUNT = 200;
  38     private static final int STEPS_COUNT = 20;
  39 
  40     public static void main(String[] args) throws Exception {
  41         final Window rootWindow = createWindow(null);
  42 
  43         new Thread(() -> {
  44             for (int i = 0; i < WINDOWS_COUNT; i++) {
  45                 createWindow(rootWindow);
  46             }
  47         }).start();
  48 
  49         boolean alwaysOnTop = true;
  50         for (int i = 0; i < STEPS_COUNT; i++) {
  51             Thread.sleep(10);
  52             rootWindow.setAlwaysOnTop(alwaysOnTop);
  53             alwaysOnTop = !alwaysOnTop;
  54         }
  55     }
  56 
  57     private static Window createWindow(Window parent) {
  58         Window window = new Window(parent);
  59         window.setSize(200, 200);
  60         window.setVisible(true);
  61         return window;
  62     }
  63 }