The whole code:

 Declare the needed modules to import
use IO::Socket::INET;
use threads;
use constant TIMEOUT => 5;

# Bind arguments passed to the code to variables
my $tag = shift;
my $cfgFilesDir = shift;
my $peerPort = shift;

# Open the configuration files directory and create a thread for each 
+configuration file
opendir (CDIR, $cfgFilesDir) or die;
my $file;
my $thr;
while ($file = readdir(CDIR)) {
    if ($file =~ /.+?\.properties/) {
        $thr = threads->create(\&sendRequest, $file, 'localhost', $pee
+rPort );
    }
}
closedir (CDIR);

# Wait till all the threads will finish their work. In the threads sub
+ I implemented a timeout
# mechanism to prevent a infinity loop
my @threads;
my $thread;
my $rc;
while (@threads = threads->list()) {
    foreach $thread (@threads) {
        if ($thread->is_joinable()) {
            $rc = $thread->join();
            
            # Send the opcmon
            # $rc->[0] is the return code.
            # $rc->[1] is the nodeName the thread worked on.
            &sendOpcmon($tag, $rc->[0], $rc->[1]);
        }
    }
    
    # To prevent the hard CPU lookups
    sleep(1);
}

#
sub sendRequest {
        my ($msg, $peerAddr, $peerPort) = @_;
    my $eTime = time() + TIMEOUT;
    my $host = (split/\./, $msg)[0];
    
    # configure the socket.
    $MySocket = new IO::Socket::INET->new(    PeerPort => $peerPort,
                            Proto => 'udp',
                            PeerAddr => $peerAddr,
                            );
    ioctl($MySocket, 0x8004667e, pack("I", 1));
    
    # Send the request.
    $MySocket->send($msg);

    # Now we will wait till the server will respond to our request.
    while(time() < $eTime)
    {
        $MySocket->recv($text,128);
        if($text =~ /OK/) {
            return [1, $host];
        }
        
        # Sleep for 2 secs just to free up a %CPU usage
        sleep 2;
    }
    
    # We reached the timeout, probably no response will arrive.
    return [0, $host];
}

#
sub sendOpcmon
{
    my ($tag, $val, $object) = @_;
    
    my $cmd = "opcmon $tag=$val -object $object";
    #qx{$cmd};
    print $cmd."\n";
}
[download]

Module versions you requested:
perl: v5.8.8 built for MSWin32-x86-multi-thread
threads: 1.63
IO:Socket:INET: 1.31
(all the above modules where installed with the standard activePerl distribution)
Hope that information will be enough. Thank you!

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