sub walktimer {
    #Sleep for 180 seconds, upon completion execute SQL to change OK_OPEN back to all zero for $showcasenum
    my $showcasenum = $_[0];
    debug("Launched walking timer thread for $showcasenum");
    $SIG{'KILL'} = sub { threads->exit(); };
 
    my $count = $walktime;
    sleep( 1 ) while --$count; ### Wake once per second for $walktime seconds to allow the "signal handler" to respond to any pending "signals".

    if( threads->is_detached()) {
        threads->exit();
    }
    my $dbh = DBI->connect('dbi:mysql:alarm:databasehost','username','password') or die "Connection Error: $DBI::errstr\n";
    my $sql = "update Showcases set OK_OPEN=0 WHERE SC_NUM = ?";
    my $sth = $dbh->prepare($sql) or die "Can't prepare $sql: $dbh->errstr\n";
    $sth->execute($showcasenum) or die "SQL Error: $DBI::errstr\n";
    $dbh->disconnect;
    debug("Walking thread for $showcasenum is expiring...");
    threads->detach();
}