J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 1999 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| 20 | * CA 95054 USA or visit www.sun.com if you need additional information or |
| 21 | * have any questions. |
| 22 | */ |
| 23 | |
| 24 | /* |
| 25 | * @test |
| 26 | * @bug 4176738 |
| 27 | * @summary Make sure a deadlock situation |
| 28 | * would not occur |
| 29 | */ |
| 30 | |
| 31 | import java.net.*; |
| 32 | import java.io.*; |
| 33 | |
| 34 | public class DeadlockTest { |
| 35 | public static void main(String [] argv) throws Exception { |
| 36 | |
| 37 | // Start the server thread |
| 38 | Thread s1 = new Thread(new ServerThread()); |
| 39 | s1.start(); |
| 40 | |
| 41 | // Sleep to make sure s1 has created a server socket |
| 42 | Thread.sleep(1000); |
| 43 | |
| 44 | // Start the client thread |
| 45 | ClientThread ct = new ClientThread(); |
| 46 | Thread c1 = new Thread(ct); |
| 47 | c1.start(); |
| 48 | |
| 49 | // Wait for the client thread to finish |
| 50 | c1.join(40000); |
| 51 | |
| 52 | // If timeout, we assume there is a deadlock |
| 53 | if (c1.isAlive() == true) { |
| 54 | // Close the socket to force the server thread |
| 55 | // terminate too |
| 56 | s1.stop(); |
| 57 | ct.getSock().close(); |
| 58 | throw new Exception("Takes too long. Dead lock"); |
| 59 | } |
| 60 | } |
| 61 | } |
| 62 | |
| 63 | class ServerThread implements Runnable { |
| 64 | |
| 65 | private static boolean dbg = false; |
| 66 | |
| 67 | ObjectInputStream in; |
| 68 | ObjectOutputStream out; |
| 69 | |
| 70 | ServerSocket server; |
| 71 | |
| 72 | Socket sock; |
| 73 | |
| 74 | public ServerThread() throws Exception { |
| 75 | |
| 76 | } |
| 77 | |
| 78 | public void ping(int cnt) { |
| 79 | Message.write(out, new PingMessage(cnt)); |
| 80 | } |
| 81 | |
| 82 | private int cnt = 1; |
| 83 | |
| 84 | public void run() { |
| 85 | |
| 86 | try { |
| 87 | if (Thread.currentThread().getName().startsWith("child") == false) { |
| 88 | server = new ServerSocket(4711); |
| 89 | sock = server.accept(); |
| 90 | |
| 91 | new Thread(this, "child").start(); |
| 92 | |
| 93 | out = new ObjectOutputStream(sock.getOutputStream()); |
| 94 | out.flush(); |
| 95 | |
| 96 | if (dbg) System.out.println("*** ping0 ***"); |
| 97 | ping(0); |
| 98 | if (dbg) System.out.println("*** ping1 ***"); |
| 99 | ping(1); |
| 100 | if (dbg) System.out.println("*** ping2 ***"); |
| 101 | ping(2); |
| 102 | if (dbg) System.out.println("*** ping3 ***"); |
| 103 | ping(3); |
| 104 | if (dbg) System.out.println("*** ping4 ***"); |
| 105 | ping(4); |
| 106 | if (dbg) System.out.println("*** end ***"); |
| 107 | } |
| 108 | |
| 109 | } catch (Throwable e) { |
| 110 | // If anything goes wrong, just quit. |
| 111 | } |
| 112 | |
| 113 | if (Thread.currentThread().getName().startsWith("child")) { |
| 114 | try { |
| 115 | |
| 116 | in = new ObjectInputStream(sock.getInputStream()); |
| 117 | |
| 118 | while (true) { |
| 119 | if (dbg) System.out.println("read " + cnt); |
| 120 | Message msg = (Message) in.readObject(); |
| 121 | if (dbg) System.out.println("read done " + cnt++); |
| 122 | switch (msg.code) { |
| 123 | case Message.PING: { |
| 124 | if (true) System.out.println("ping recv'ed"); |
| 125 | } break; |
| 126 | } |
| 127 | |
| 128 | } |
| 129 | |
| 130 | } catch (Throwable e) { |
| 131 | // If anything goes wrong, just quit. } |
| 132 | } |
| 133 | } |
| 134 | } |
| 135 | } |
| 136 | |
| 137 | class ClientThread implements Runnable { |
| 138 | |
| 139 | ObjectInputStream in; |
| 140 | ObjectOutputStream out; |
| 141 | |
| 142 | Socket sock; |
| 143 | |
| 144 | public ClientThread() throws Exception { |
| 145 | try { |
| 146 | System.out.println("About to create a socket"); |
| 147 | sock = new Socket(InetAddress.getLocalHost().getHostName(), 4711); |
| 148 | System.out.println("connected"); |
| 149 | |
| 150 | out = new ObjectOutputStream(sock.getOutputStream()); |
| 151 | out.flush(); |
| 152 | } catch (Throwable e) { |
| 153 | System.out.println("client failed with: " + e); |
| 154 | e.printStackTrace(); |
| 155 | throw new Exception("Unexpected exception"); |
| 156 | } |
| 157 | } |
| 158 | |
| 159 | public Socket getSock() { |
| 160 | return sock; |
| 161 | } |
| 162 | |
| 163 | private int cnt = 1; |
| 164 | |
| 165 | public void run() { |
| 166 | try { |
| 167 | in = new ObjectInputStream(sock.getInputStream()); |
| 168 | |
| 169 | int count = 0; |
| 170 | |
| 171 | while (true) { |
| 172 | System.out.println("read " + cnt); |
| 173 | Message msg = (Message) in.readObject(); |
| 174 | System.out.println("read done " + cnt++); |
| 175 | switch (msg.code) { |
| 176 | case Message.PING: { |
| 177 | System.out.println("ping recv'ed"); |
| 178 | count++; |
| 179 | } break; |
| 180 | } |
| 181 | if (count == 5) { |
| 182 | sock.close(); |
| 183 | break; |
| 184 | } |
| 185 | } |
| 186 | } catch (IOException ioe) { |
| 187 | } catch (Throwable e) { |
| 188 | // If anything went wrong, just quit |
| 189 | } |
| 190 | } |
| 191 | |
| 192 | } |
| 193 | |
| 194 | class Message implements java.io.Serializable { |
| 195 | |
| 196 | static final int UNKNOWN = 0; |
| 197 | static final int PING = 1; |
| 198 | |
| 199 | protected int code; |
| 200 | |
| 201 | public Message() { this.code = UNKNOWN; } |
| 202 | |
| 203 | public Message(int code) { this.code = code; } |
| 204 | |
| 205 | private static int cnt = 1; |
| 206 | |
| 207 | public static void write(ObjectOutput out, Message msg) { |
| 208 | try { |
| 209 | System.out.println("write message " + cnt); |
| 210 | out.writeObject(msg); |
| 211 | System.out.println("flush message"); |
| 212 | out.flush(); |
| 213 | System.out.println("write message done " + cnt++); |
| 214 | } catch (IOException ioe) { |
| 215 | // Ignore the exception |
| 216 | } |
| 217 | } |
| 218 | } |
| 219 | |
| 220 | class PingMessage extends Message implements java.io.Serializable { |
| 221 | |
| 222 | public PingMessage() { |
| 223 | code = Message.PING; |
| 224 | } |
| 225 | |
| 226 | public PingMessage(int cnt) |
| 227 | { |
| 228 | code = Message.PING; |
| 229 | this.cnt = cnt; |
| 230 | |
| 231 | data = new int[50000]; |
| 232 | } |
| 233 | |
| 234 | int cnt; |
| 235 | int[] data; |
| 236 | } |