close() of active socket does not work on FreeBSD 6

[Achilleas Mantzios]

Στις Δευτέρα 11 Δεκέμβριος 2006 16:46, ο/η Arne H. Juul έγραψε:
> I've had problems with some tests hanging on FreeBSD 6/amd64. This happens
> both with diablo-1.5.0_07-b01 and the java/jdk15 compiled from ports.
>
> After much digging we've determined that the root cause is that
> the guarantee in the socket.close() API, see the documentation at
> http://java.sun.com/j2se/1.5.0/docs/api/java/net/Socket.html#close()
> isn't fulfulled - the thread blocked in I/O on the socket doesn't wake up.
>
> Here's a pretty small test program that demonstrates the problem (given
> that you're running sshd on port 22, if not change the port number to
> something that the program can connect to).  Is this a known problem?
> Does it happen for everybody on FreeBSD 6?
>

In my systems,
1.4.2-p7, diablo-1.5.0_07-b00 have this problem.
However with linux 1.4.2_12-b03 right after socket.close(), IOException is 
thrown and caught by the FooConn thread.
>
>
> import java.io.*;
> import java.net.*;
> import java.util.*;
> import java.util.logging.*;
>
> public class FooConn extends Thread {
>      private boolean alive;
>      public final int port;
>      private Socket socket = null;
>
>      public FooConn(int port) {
>          super("FooConn:" + port);
>          this.port = port;
>          this.alive = true;
>      }
>      private void connect() {
>          while (socket == null) {
>              try {
>                  socket = new Socket("localhost", port);
>              } catch(IOException e) {
>                  System.err.println("Connect failed: " + e);
>                  try { Thread.sleep(1000); } catch(InterruptedException ie)
> {}
>              }
>          }
>      }
>      public void disconnect() throws IOException, InterruptedException {
>          alive = false;
>          System.out.println("closing socket");
>          socket.close();
>          System.out.println("calling join");
>          join();
>      }
>      public void run() {
>          while (alive) {
>              if (socket == null) {
>                  System.out.println("socket null, connect");
>                  connect();
>              }
>              try {
>                  int b = socket.getInputStream().read();
>                  System.out.println("got byte "+ b);
>              } catch (IOException e) {
>                  System.out.println("IOException, set socket to null");
>                  socket = null; //triggers reconnect
>              } catch (RuntimeException e) {
>                  System.err.println("RuntimeException "+e);
>                  return;
>              }
>          }
>      }
>      public static void main(String[] args) throws IOException {
>          try {
>              FooConn conn = new FooConn(22);
>              conn.start();
>              Thread.sleep(1000);
>              conn.disconnect();
>          } catch(InterruptedException ie) {}
>      }
> }
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-- 
Achilleas Mantzios