| /* |
| * Copyright (c) 2007, 2010, 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 { |
| |
| // Skip test on pre-2.6 kernels until the poll SelectorProvider |
| // is updated |
| String osname = System.getProperty("os.name"); |
| if (osname.equals("Linux")) { |
| String[] ver = System.getProperty("os.version").split("\\.", 0); |
| if (ver.length >=2 ) { |
| int major = Integer.parseInt(ver[0]); |
| int minor = Integer.parseInt(ver[1]); |
| if (major < 2 || (major == 2 && minor < 6)) { |
| System.out.println("Test passing on pre-2.6 kernel"); |
| return; |
| } |
| } |
| } |
| |
| |
| // 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"); |
| } |
| |
| } |