| /* |
| * Copyright (c) 2009, 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 6693490 |
| * @summary Pre-close file descriptor may inadvertently get registered with |
| * epoll during close |
| */ |
| |
| import java.net.*; |
| import java.nio.channels.*; |
| import java.util.concurrent.*; |
| import java.util.*; |
| import java.io.IOException; |
| |
| public class RegAfterPreClose { |
| |
| static final int TEST_ITERATIONS = 300; |
| static volatile boolean done; |
| |
| /** |
| * A task that continuously connects to a given address and immediately |
| * closes the connection. |
| */ |
| static class Connector implements Runnable { |
| private final SocketAddress sa; |
| Connector(int port) throws IOException { |
| InetAddress lh = InetAddress.getLocalHost(); |
| this.sa = new InetSocketAddress(lh, port); |
| } |
| public void run() { |
| while (!done) { |
| try { |
| SocketChannel.open(sa).close(); |
| } catch (IOException x) { |
| // back-off as probably resource related |
| try { |
| Thread.sleep(10); |
| } catch (InterruptedException ignore) { } |
| } |
| } |
| } |
| } |
| |
| /** |
| * A task that closes a channel. |
| */ |
| static class Closer implements Runnable { |
| private final Channel channel; |
| Closer(Channel sc) { |
| this.channel = sc; |
| } |
| public void run() { |
| try { |
| channel.close(); |
| } catch (IOException ignore) { } |
| } |
| } |
| |
| public static void main(String[] args) throws Exception { |
| // create listener |
| InetSocketAddress isa = new InetSocketAddress(0); |
| ServerSocketChannel ssc = ServerSocketChannel.open(); |
| ssc.socket().bind(isa); |
| |
| // register with Selector |
| final Selector sel = Selector.open(); |
| ssc.configureBlocking(false); |
| SelectionKey key = ssc.register(sel, SelectionKey.OP_ACCEPT); |
| |
| ThreadFactory factory = new ThreadFactory() { |
| @Override |
| public Thread newThread(Runnable r) { |
| Thread t = new Thread(r); |
| t.setDaemon(true); |
| return t; |
| } |
| }; |
| |
| // create Executor that handles tasks that closes channels |
| // "asynchronously" - this creates the conditions to provoke the bug. |
| ExecutorService executor = Executors.newFixedThreadPool(2, factory); |
| |
| // submit task that connects to listener |
| executor.execute(new Connector(ssc.socket().getLocalPort())); |
| |
| // loop accepting connections until done (or an IOException is thrown) |
| int remaining = TEST_ITERATIONS; |
| while (remaining > 0) { |
| sel.select(); |
| if (key.isAcceptable()) { |
| SocketChannel sc = ssc.accept(); |
| if (sc != null) { |
| remaining--; |
| sc.configureBlocking(false); |
| sc.register(sel, SelectionKey.OP_READ); |
| executor.execute(new Closer(sc)); |
| } |
| } |
| sel.selectedKeys().clear(); |
| } |
| done = true; |
| sel.close(); |
| executor.shutdown(); |
| } |
| } |