--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/jdk/test/java/net/PortUnreachableException/Concurrent.java	Sat Dec 01 00:00:00 2007 +0000
@@ -0,0 +1,125 @@
+/*
+ * Copyright 2001 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ */
+
+/*
+ * @test
+ * @bug 4431020
+ * @summary On Windows 2000 we observed behaviour that reflects the underlying
+ * implementation :-
+ *   1. PortUnreachableException throw per underlying reset
+ *   2. No PUE throw for DatagramSocket.send
+ */
+import java.net.*;
+
+public class Concurrent implements Runnable {
+
+    DatagramSocket s;
+
+    public void run() {
+        try {
+            byte b[] = new byte[512];
+            DatagramPacket p = new DatagramPacket(b, b.length);
+
+            int pue_count = 0;
+            while (true) {
+                try {
+                    System.out.println("receive...");
+                    s.receive(p);
+                } catch (PortUnreachableException pue) {
+                    System.out.println("receive threw PortUnreachableException");
+                    pue_count++;
+                }
+                System.out.println("receiver sleeping");
+                Thread.currentThread().sleep(100*pue_count);
+            }
+
+        } catch (Exception e) { }
+    }
+
+    Concurrent(InetAddress ia, int port) throws Exception {
+
+        System.out.println("");
+        System.out.println("***");
+        System.out.println("Test Description:");
+        System.out.println("    - Block reader thread on receive");
+        System.out.println("    - Send datagrams to bad destination with wee pauses");
+        System.out.println("    - Observe which thread gets the PUE");
+        System.out.println("");
+
+        /*
+         * Create the datagram and connect it to destination
+         */
+        s = new DatagramSocket();
+        s.connect(ia, port);
+        s.setSoTimeout(60000);
+
+        /*
+         * Start the reader thread
+         */
+        Thread thr = new Thread(this);
+        thr.start();
+        Thread.currentThread().sleep(2000);
+
+        byte b[] = new byte[512];
+        DatagramPacket p = new DatagramPacket(b, b.length);
+
+        /*
+         * Send a bunch of packets to the destination
+         */
+        for (int i=0; i<10; i++) {
+            try {
+                System.out.println("Sending...");
+                s.send(p);
+            } catch (PortUnreachableException e) {
+                System.out.println("send threw PortUnreachableException");
+            }
+            Thread.currentThread().sleep(100);
+        }
+
+        /*
+         * Give time for ICMP port unreachables to return
+         */
+        Thread.currentThread().sleep(5000);
+
+        s.close();
+    }
+
+
+    public static void main(String args[]) throws Exception {
+
+        InetAddress ia;
+        int port;
+        if (args.length >= 2) {
+            ia = InetAddress.getByName(args[0]);
+            port = Integer.parseInt(args[1]);
+        } else {
+            ia = InetAddress.getLocalHost();
+            DatagramSocket s1 = new DatagramSocket();
+            port = s1.getLocalPort();
+            s1.close();
+        }
+
+        new Concurrent(ia, port);
+    }
+
+}