component/swoole/processpool.php
public function useQueue(int $msgkey = 0, int $mode = 2)
    {
        $this->process->useQueue($msgkey, $mode);
    }
public function useQueue(int $msgkey = 0, int $mode = 2)
    {
        $this->process->useQueue($msgkey, $mode);
    }
Enable message queuing as interprocess communication

@param int $msgkey
@param int $mode