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 *
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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