WordPress and pthreads

Hi, I know this is probably not a good idea but I want to know how to make this work anyway. In a WordPress plugin I have the following code.

class Test_WP extends Thread {
    public function run() {
        update_option('test', 'two');
    }
}

update_option('test', 'one');

$test_wp = new Test_WP();
$test_wp->start();

The option in the database is set to ‘one’. If I call and require wp–load.php in the thread it makes no difference, I thought the thread might not have access to the WP functions but no errors have been generated.

Any ideas on how to get WordPress multithreaded?