test/jdk/java/nio/channels/Selector/SelectAndCancel.java
author mli
Thu, 26 Apr 2018 10:29:44 +0800
changeset 49893 e1e60f75cd39
parent 47216 71c04702a3d5
permissions -rw-r--r--
8157543: java/nio/channels/Selector/SelectAndCancel.java fails intermittently Reviewed-by: alanb
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/*
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 * Copyright (c) 2004, 2018, 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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/* @test
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 * @bug 4729342
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 * @library /test/lib
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 * @build jdk.test.lib.Utils
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 * @run main SelectAndCancel
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 * @summary Check for CancelledKeyException when key cancelled during select
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 */
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import java.net.InetAddress;
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import java.net.InetSocketAddress;
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import java.nio.channels.SelectionKey;
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import java.nio.channels.Selector;
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import java.nio.channels.ServerSocketChannel;
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import java.util.concurrent.CountDownLatch;
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public class SelectAndCancel {
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    static volatile SelectionKey sk;
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    static volatile Throwable ex;
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    /*
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     * CancelledKeyException is the failure symptom of 4729342
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     * NOTE: The failure is timing dependent and is not always
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     * seen immediately when the bug is present.
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     */
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    public static void main(String[] args) throws Throwable {
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        final Selector selector = Selector.open();
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        final ServerSocketChannel ssc = ServerSocketChannel.open().bind(
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                new InetSocketAddress(InetAddress.getLoopbackAddress(), 0));
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        final InetSocketAddress isa = (InetSocketAddress)ssc.getLocalAddress();
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        final CountDownLatch signal = new CountDownLatch(1);
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        // Create and start a selector in a separate thread.
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        Thread t = new Thread(new Runnable() {
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                public void run() {
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                    try {
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                        ssc.configureBlocking(false);
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                        sk = ssc.register(selector, SelectionKey.OP_ACCEPT);
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                        signal.countDown();
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                        selector.select();
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                    } catch (Throwable e) {
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                        ex = e;
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                    }
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                }
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            });
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        t.start();
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        signal.await();
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        // Wait for above thread to get to select() before we call cancel.
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        Thread.sleep((long)(300 * jdk.test.lib.Utils.TIMEOUT_FACTOR));
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        // CancelledKeyException should not be thrown.
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        ssc.close();
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        sk.cancel();
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        selector.close();
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        t.join();
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        if (ex != null) {
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            throw ex;
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        }
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    }
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}