1 /* 2 * Copyright (c) 2006, 2010, 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 /* @test 25 * @bug 6436220 26 * @summary SelectionKey.attach should atomically set and return the attachment 27 */ 28 import java.nio.channels.*; 29 import java.util.concurrent.atomic.*; 30 31 public class AtomicAttachTest { main(String[] args)32 public static void main(String[] args) throws Exception { 33 Selector selector = Selector.open(); 34 Pipe pipe = Pipe.open(); 35 SelectableChannel channel = pipe.sink().configureBlocking(false); 36 final SelectionKey key = channel.register(selector, 0); 37 key.attach(new AtomicBoolean()); 38 39 final AtomicInteger errorCount = new AtomicInteger(); 40 41 Thread t = new Thread() { 42 public void run() { 43 AtomicBoolean att = new AtomicBoolean(); 44 for (int i=0; i<(10*1000*1000); i++) { 45 att = (AtomicBoolean)key.attach(att); 46 // We should have exclusive ownership of att. 47 if (!att.compareAndSet(false, true) || 48 !att.compareAndSet(true, false)) 49 { 50 errorCount.incrementAndGet(); 51 } 52 } 53 } 54 { 55 start(); 56 run(); 57 } 58 }; 59 60 t.join(); 61 62 pipe.sink().close(); 63 pipe.source().close(); 64 selector.close(); 65 66 int count = errorCount.get(); 67 if (count > 0) { 68 throw new RuntimeException("Error count:" + count); 69 } 70 } 71 } 72