Kraken\Promise\Helper\CancellationQueue::drain PHP Метод

    private function drain()
    {
        for ($i = key($this->queue); isset($this->queue[$i]); $i++) {
            $cancellable = $this->queue[$i];
            $ex = null;
            try {
                $cancellable->cancel();
            } catch (Error $ex) {
            } catch (Exception $ex) {
            }
            unset($this->queue[$i]);
            if ($ex) {
                throw $ex;
            }
        }
        $this->queue = [];
    }