select kinda does the trick. I can now monitor the server. If the client disconnects, it is captured and the thread running the read/write is killed.

now I have another problem. Even though a new socket seems to be opened after reconnect, I can only write to it, when I have the print"$pid \n"; before cancelling the thread. If i comment that out, it just prints out:

SEND( TYPE q or Q to Quit):

RECIEVED:

SEND( TYPE q or Q to Quit):

RECIEVED:
SEND( TYPE q or Q to Quit):Use of uninitialized value $send_data in sc
+alar chop
at select_server.pl line 46, <STDIN> line 5.

RECIEVED:
SEND( TYPE q or Q to Quit):Terminating on signal SIGINT(2)
[download]

The error above shows up when hitting CTRL-C

use IO::Select;
use IO::Socket();
use threads;
use threads::shared;
use Thread::Cancel ;
use strict;
use warnings;
my $Thread;
my $lsn = new IO::Socket::INET(Listen => 1, LocalPort => 5000);
my $sel = new IO::Select( $lsn );
my $tid : shared;
    while(my @ready = $sel->can_read) {
        foreach my $fh (@ready) {
           if($fh == $lsn) {
                # Create a new socket
                my $new = $lsn->accept;
                $sel->add($new);
                my $Thread = threads->create( "echoserver", $new);  #s
+tart the echo-server as a seperate thread
                #$Thread->detach();
                 }
            else {
                # Process socket
                # Maybe we have finished with the socket
                print "$tid\n";
                my $Thread = threads->object($tid);  #get handle of cu
+rrent echo-server thread
                $sel->remove($fh);
                $fh->close;
                threads->cancel($Thread);            #kill the thread.
+  a new one will get started when we reconnect
                }
        }
    }
    
sub echoserver {
   #Clienthandle
    my $session = shift;
    my $own_thread;
    # get our own thread-id and store it, so we can kill the thread fr
+om outside
    $own_thread=threads->self();
    $tid = threads->tid($own_thread);
    lock($tid);
    $session->autoflush(1);    #make sure the socket get read right aw
+ay
    while (1) {print "\n SEND( TYPE q or Q to Quit):";
        my $recieved_data;
        my $send_data = <STDIN>;
        STDIN->autoflush(1);
        chop($send_data); 
        $session->send($send_data);
        $session->recv($recieved_data,1024);print "\n RECIEVED: $recie
+ved_data";}
}
[download]

Thanks,