#!/usr/bin/perl -w
use threads ('yield',
    'stack_size' => 64*4096,
    'exit' => 'threads_only',
    'stringify');
use IO::Socket::INET;
my %shared_value :shared;

sub sleeping
{
    {
        lock %shared_value;
        #do somesing with %shared_value
        #...
    }
    sleep 60;
}

my $commandLinePrefix = "Command: ";

sub listeningClient
{
    my $client = shift;

    my $clientHost = $client->peerhost;

    $client->autoflush(1);
    print $client "Welcome to $0; type help for command list.\n$commandLinePrefix";
    while ( <$client> )
    {
        next unless /\S/;
        if ( /quit|exit|^q\n?\r?$/i )
        {
            print $client "Closing connection\n";
            last;
        }
        elsif ( /^sleep|^s\n?\r?$/i )
        {
            threads->create( \&sleeping )->detach();
        }
        else
        {
            print $client <<EOF;
COMMANDS:
    quit|exit|q - quit from current session
    sleep|s - fall asleep
EOF
        }
    }
    continue
    {
        print $client $commandLinePrefix;
    }
    close $client;
}

sub startServer
{
    $IP = shift || 'localhost';
    $PORT = shift || 9000;

    $server = IO::Socket::INET->new( Proto => "tcp",
        LocalAddr => $IP.':'.$PORT,
        Listen => SOMAXCONN,
        Reuse => 1);

    unless( $server )
    {
        print "can't setup server. Error: $@\n";
        exit;
    }

    print "[Server $0 accepting clients]\n";

    while( my $connection = $server->accept() )
    {
        my $thr = threads->create( \&listeningClient, $connection );
        close $connection;
    }
}

sub main
{
    my $ip = 'localhost';
    my $port = 9000;
    use Getopt::Long;

    GetOptions( "ip=s" => \$ip,
        "port=i" => \$port );
    startServer( $ip, $port );
}

main();