PHPDaemon\Thread\Generic::sleep PHP Method

    public function sleep($s)
    {
        static $interval = 0.2;
        $n = $s / $interval;
        for ($i = 0; $i < $n; ++$i) {
            if ($this->shutdown) {
                return false;
            }
            \usleep($interval * 1000000);
        }
        return true;
    }