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                # sleep/usleep的影響 [TOC] 在異步IO的程序中,**不得使用sleep/usleep/time\_sleep\_until/time\_nanosleep**。(下文中使用`sleep`泛指所有睡眠函數) * `sleep`函數會使進程陷入睡眠阻塞 * 直到指定的時間后操作系統才會重新喚醒當前的進程 * `sleep`過程中,只有信號可以打斷 * 由于`Swoole`的信號處理是基于`signalfd`實現的,所以即使發送信號也無法中斷`sleep` `Swoole`提供的`swoole_event_add`、`swoole_timer_tick`、`swoole_timer_after`、`swoole_process::signal`、`異步swoole_client`在進程sleep后會停止工作。`swoole_server`也無法再處理新的請求。 ## 實例程序 ~~~ $serv = new swoole_server("127.0.0.1", 9501); $serv->set(['worker_num' => 1]); $serv->on('receive', function ($serv, $fd, $from_id, $data) { sleep(100); $serv->send($fd, 'Swoole: '.$data); }); $serv->start(); ~~~ `onReceive`事件中執行了`sleep`函數,server在100秒內無法再收到任何客戶端請求。
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