Agora_Driver::isThreadLocked PHP Method

    public function isThreadLocked($message_id)
    {
        $sql = 'SELECT message_thread FROM ' . $this->_threads_table . ' WHERE message_id = ?';
        $thread = $this->_db->selectValue($sql, array($message_id));
        return $this->_db->selectValue('SELECT locked FROM ' . $this->_threads_table . ' WHERE message_id = ?', array($thread));
    }