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/*
* Copyright (c) 2007, 2018, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
/* @test
* @bug 6403933
* @summary POLLHUP or POLLERR on "idle" key can cause Selector to spin
*/
import java.io.*;
import java.net.*;
import java.nio.*;
import java.nio.channels.*;
import java.net.*;
import java.nio.channels.*;
public class CloseWhenKeyIdle {
// indicates if the wakeup has happened
static volatile boolean wakeupDone = false;
// Wakes up a Selector after a given delay
static class Waker implements Runnable {
private Selector sel;
private long delay;
Waker(Selector sel, long delay) {
this.sel = sel;
this.delay = delay;
}
public void run() {
try {
Thread.sleep(delay);
wakeupDone = true;
sel.wakeup();
} catch (Exception x) {
x.printStackTrace();
}
}
}
public static void main(String[] args) throws Exception {
// establish loopback connection
ServerSocketChannel ssc = ServerSocketChannel.open();
ssc.socket().bind(new InetSocketAddress(0));
SocketAddress remote = new InetSocketAddress(InetAddress.getLocalHost(),
ssc.socket().getLocalPort());
SocketChannel sc1 = SocketChannel.open(remote);
SocketChannel sc2 = ssc.accept();
// register channel for one end with a Selector, interest set = 0
Selector sel = Selector.open();
sc1.configureBlocking(false);
SelectionKey k = sc1.register(sel, 0);
sel.selectNow();
// hard close to provoke POLLHUP
sc2.socket().setSoLinger(true, 0);
sc2.close();
// schedule wakeup after a few seconds
Thread t = new Thread(new Waker(sel, 5000));
t.setDaemon(true);
t.start();
// select should block
int spinCount = 0;
boolean failed = false;
for (;;) {
int n = sel.select();
if (n > 0) {
System.err.println("Channel should not be selected!!!");
failed = true;
break;
}
// wakeup
if (wakeupDone)
break;
// wakeup for no reason - if it happens a few times then we have a
// problem
spinCount++;
if (spinCount >= 3) {
System.err.println("Selector appears to be spinning");
failed = true;
break;
}
}
sc1.close();
sel.close();
if (failed)
throw new RuntimeException("Test failed");
System.out.println("PASS");
}
}
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