131 lines
3.6 KiB
Java
131 lines
3.6 KiB
Java
/*
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* Copyright (c) 2007, 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 6403933
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* @summary POLLHUP or POLLERR on "idle" key can cause Selector to spin
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*/
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import java.io.*;
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import java.net.*;
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import java.nio.*;
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import java.nio.channels.*;
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import java.net.*;
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import java.nio.channels.*;
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public class CloseWhenKeyIdle {
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// indicates if the wakeup has happened
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static volatile boolean wakeupDone = false;
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// Wakes up a Selector after a given delay
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static class Waker implements Runnable {
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private Selector sel;
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private long delay;
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Waker(Selector sel, long delay) {
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this.sel = sel;
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this.delay = delay;
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}
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public void run() {
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try {
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Thread.sleep(delay);
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wakeupDone = true;
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sel.wakeup();
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} catch (Exception x) {
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x.printStackTrace();
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}
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}
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}
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public static void main(String[] args) throws Exception {
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// establish loopback connection
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ServerSocketChannel ssc = ServerSocketChannel.open();
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ssc.socket().bind(new InetSocketAddress(0));
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SocketAddress remote = new InetSocketAddress(InetAddress.getLocalHost(),
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ssc.socket().getLocalPort());
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SocketChannel sc1 = SocketChannel.open(remote);
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SocketChannel sc2 = ssc.accept();
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// register channel for one end with a Selector, interest set = 0
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Selector sel = Selector.open();
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sc1.configureBlocking(false);
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SelectionKey k = sc1.register(sel, 0);
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sel.selectNow();
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// hard close to provoke POLLHUP
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sc2.socket().setSoLinger(true, 0);
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sc2.close();
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// schedule wakeup after a few seconds
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Thread t = new Thread(new Waker(sel, 5000));
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t.setDaemon(true);
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t.start();
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// select should block
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int spinCount = 0;
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boolean failed = false;
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for (;;) {
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int n = sel.select();
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if (n > 0) {
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System.err.println("Channel should not be selected!!!");
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failed = true;
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break;
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}
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// wakeup
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if (wakeupDone)
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break;
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// wakeup for no reason - if it happens a few times then we have a
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// problem
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spinCount++;
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if (spinCount >= 3) {
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System.err.println("Selector appears to be spinning");
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failed = true;
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break;
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}
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}
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sc1.close();
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sel.close();
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if (failed)
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throw new RuntimeException("Test failed");
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System.out.println("PASS");
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}
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}
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