1.知识点
1.主要看里面的SIGUSR1和SIGUSR2信号的作用
2.向指定pid进程发送信号
2.代码分析
public function exec(array $args): ?string{// TODO: Implement exec() method.$all = false;//---------------------------------1.判断是重启task_worker还是平稳地restart所有Worker进程------------------------------if(in_array('all',$args)){$all = true;}//---------------------------------2.这里不知道要干啥------------------------------if(in_array('produce',$args)){Core::getInstance()->setIsDev(false);}$Conf = Config::getInstance();$res = '';//---------------------------------3.获取pidfile------------------------------$pidFile = $Conf->getConf("MAIN_SERVER.SETTING.pid_file");if (file_exists($pidFile)) {//---------------------------------4.判断是重启task_worker还是平稳地restart所有Worker进程------------------------------if (!$all) {$sig = SIGUSR2;$res = $res.Utility::displayItem('reloadType',"only-task")."\n";} else {$sig = SIGUSR1;$res = $res.Utility::displayItem('reloadType',"all-worker")."\n";}//---------------------------------5.清理cli面板------------------------------Utility::opCacheClear();$pid = file_get_contents($pidFile);//---------------------------------6.判断是否有此进程------------------------------if (!\swoole_process::kill($pid, 0)) {return "pid :{$pid} not exist ";}//---------------------------------7.这个方法可以向进程发送信号，不要看到kill理解成杀死------------------------------\swoole_process::kill($pid, $sig);return $res. "send server reload command at " . date("Y-m-d H:i:s");} else {return "PID file does not exist, please check whether to run in the daemon mode!";}}