1/* 2 * Copyright (c) 2004, 2017, 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 5004077 26 * @summary Check blocking of select and close 27 */ 28 29import java.nio.channels.*; 30import java.io.IOException; 31import java.util.concurrent.CountDownLatch; 32 33public class SelectAndClose { 34 static Selector selector; 35 static volatile boolean awakened = false; 36 static volatile boolean closed = false; 37 38 public static void main(String[] args) throws Exception { 39 selector = Selector.open(); 40 41 // Create and start a selector in a separate thread. 42 final CountDownLatch selectLatch = new CountDownLatch(1); 43 new Thread(new Runnable() { 44 public void run() { 45 try { 46 selectLatch.countDown(); 47 selector.select(); 48 awakened = true; 49 } catch (IOException e) { 50 System.err.println(e); 51 } 52 } 53 }).start(); 54 55 // Wait for above thread to get to select() before we call close. 56 selectLatch.await(); 57 Thread.sleep(2000); 58 59 // Try to close. This should wakeup select. 60 Thread closeThread = new Thread(new Runnable() { 61 public void run() { 62 try { 63 selector.close(); 64 closed = true; 65 } catch (IOException e) { 66 System.err.println(e); 67 } 68 } 69 }); 70 closeThread.start(); 71 72 // Wait for select() to be awakened, which should be done by close. 73 closeThread.join(); 74 75 if (!awakened) 76 selector.wakeup(); 77 78 // Correct result is true and true 79 if (!awakened) 80 throw new RuntimeException("Select did not wake up"); 81 if (!closed) 82 throw new RuntimeException("Selector did not close"); 83 } 84} 85