1 /*

     2  * Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.

     8  *

     9  * This code is distributed in the hope that it will be useful, but WITHOUT

    10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    12  * version 2 for more details (a copy is included in the LICENSE file that

    13  * accompanied this code).

    14  *

    15  * You should have received a copy of the GNU General Public License version

    16  * 2 along with this work; if not, write to the Free Software Foundation,

    17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    18  *

    19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    20  * or visit www.oracle.com if you need additional information or have any

    21  * questions.

    22  */

    23 

    24 /*

    25  * @test

    26  * @bug 8006395 8012244

    27  * @summary Tests racing code that reads and closes a Socket

    28  */

    29 

    30 import java.io.InputStream;

    31 import java.net.ServerSocket;

    32 import java.net.Socket;

    33 import java.net.SocketException;

    34 import java.util.concurrent.Phaser;

    35 

    36 // Racey test, will not always fail, but if it does then we have a problem.

    37 

    38 public class Race {

    39     final static int THREADS = 100;

    40 

    41     public static void main(String[] args) throws Exception {

    42         try (ServerSocket ss = new ServerSocket(0)) {

    43             final int port = ss.getLocalPort();

    44             final Phaser phaser = new Phaser(THREADS + 1);

    45             for (int i=0; i<100; i++) {

    46                 final Socket s = new Socket("localhost", port);

    47                 s.setSoLinger(false, 0);

    48                 try (Socket sa = ss.accept()) {

    49                     sa.setSoLinger(false, 0);

    50                     final InputStream is = s.getInputStream();

    51                     Thread[] threads = new Thread[THREADS];

    52                     for (int j=0; j<THREADS; j++) {

    53                         threads[j] = new Thread() {

    54                         public void run() {

    55                             try {

    56                                 phaser.arriveAndAwaitAdvance();

    57                                 while (is.read() != -1)

    58                                     Thread.sleep(50);

    59                             } catch (Exception x) {

    60                                 if (!(x instanceof SocketException

    61                                       && x.getMessage().equalsIgnoreCase("socket closed")))

    62                                     x.printStackTrace();

    63                                 // ok, expect Socket closed

    64                             }

    65                         }};

    66                     }

    67                     for (int j=0; j<100; j++)

    68                         threads[j].start();

    69                     phaser.arriveAndAwaitAdvance();

    70                     s.close();

    71                     for (int j=0; j<100; j++)

    72                         threads[j].join();

    73                 }

    74             }

    75         }

    76     }

    77 }