I would like to create an IRC client in Gtk2. I based the code on a simple-bot example found at IRC hacks. So far the program connects to the server just fine, the problem I encounter is when the user closes the window. The program tends to hang and becomes non-responsive. I made an attempt to fix it but but I still cant find where it is hanging.

#!/usr/local/bin/perl -w
use strict;
use Gtk2 '-init';
use Glib qw/TRUE FALSE/;
use threads;
use threads::shared;
use IO::Socket;

#-------------------Shared Variables-------------------
my $server:shared = "irc.freenode.net";
my $nick:shared = "simple_bot";
my $login:shared = "simple_bot";
my $channel:shared = "#GRRUVI";
my $die:shared = 0;

#################################################
my $thread = threads->new( \&magic);
#################################################

#-------------------Main Loop-------------------
my $window = Gtk2::Window->new('toplevel');
$window->signal_connect( delete_event => sub {
    $die = 1;
    $thread->join;
    Gtk2->main_quit;
});
$window->set_default_size( 300, 200 );

my $table = Gtk2::Table->new(2, 1, FALSE);
my $scroller = Gtk2::ScrolledWindow->new;
my $textview = Gtk2::TextView->new;
my $entry = Gtk2::Entry->new;

$scroller->add($textview);

$table->attach_defaults($scroller, 0, 1, 0, 1);
$table->attach_defaults($entry, 0, 1, 1, 2);

$window->add($table);
$window->show_all;

Gtk2->main;

#################################################
#-------------------IRC Thread-------------------
sub magic {
    # Connect to the IRC server.
    my $sock = new IO::Socket::INET(
        PeerAddr => $server,
        PeerPort => 6667,
        Proto => 'tcp') or die "Can't connect\n";

    # Log on to the server.
    print $sock "NICK $nick\r\n";
    print $sock "USER $login 8 * :Perl IRC Hacks Robot\r\n";

    # Read lines from the server until it tells us we have connected.
    while (my $input = <$sock>) {
        # Check the numerical responses from the server.
        if ($input =~ /004/) {
            # We are now logged in.
            last;
        }
        elsif ($input =~ /433/) {
            die "Nickname is already in use.";
        }
    }
    
    goto END if $die == 1;
    
    # Join the channel.
    print $sock "JOIN $channel\r\n";

    # Keep reading lines from the server.
    while (my $input = <$sock>) {
        chop $input;
        if ($input =~ /^PING(.*)$/i) {
            # We must respond to PINGs to avoid being disconnected.
            print $sock "PONG $1\r\n";
        }
        else {
            # Print the raw line received by the bot.
            print "$input\n";
        }
        goto END if $die == 1;
    }
    END:
    undef $sock;
}
#################################################
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