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                # while循環的影響 [TOC] 異步程序如果遇到死循環,事件將無法觸發。異步IO程序使用`Reactor模型`,運行過程中必須在`reactor->wait`處輪詢。如果遇到死循環,那么程序的控制權就在while中了,`reactor`無法得到控制權,無法檢測事件,所以IO事件回調函數也將無法觸發。 > 密集運算的代碼沒有任何IO操作,所以不能稱為阻塞 ## 實例程序 ~~~ $serv = new swoole_server("127.0.0.1", 9501); $serv->set(['worker_num' => 1]); $serv->on('receive', function ($serv, $fd, $reactorId, $data) { while(1) { $i ++; } $serv->send($fd, 'Swoole: '.$data); }); $serv->start(); ~~~ `onReceive`事件中執行了死循環,`server`無法再收到任何客戶端請求,必須等待循環結束才能繼續處理新的事件。
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