Swoole 理解manager进程和worker进程的启动顺序，以及演示如何停止或者重启服务端

配置参数例子

测试的代码主要功能：开启一个tcp服务器。然后设置了管理进程和工作进程start的回调进行更名。设置了pid_file保存了服务端启动的mast进程。
<?php
//创建Server对象，监听 127.0.0.1:9501端口
$serv = new swoole_server("127.0.0.1", 9501);
$serv->set(array(
    'max_request ' => 10, //reactor thread num
    'worker_num' => 4,    //worker process num
    'log_file' => 'swoole.log',
    'pid_file' => 'server.pid',
));



$serv->on('managerStart',function($serv){
    swoole_set_process_name("managerprocess");
});

$serv->on('workerStart',function($serv, $worker_id){
    if($worker_id >= $serv->setting['worker_num']) {
        swoole_set_process_name("workprocess_".($worker_id-$serv->setting['worker_num']));
    } else {
        swoole_set_process_name("workprocess_{$worker_id}");
    }
});
$serv->on('start',function($serv){
    echo "到这一步说明服务已经起来了，manager,work都已经回调start完成";
});
//监听连接进入事件
$serv->on('connect', function ($serv, $fd) {  
    echo "Client: Connect.\n";
});

//监听数据接收事件
$serv->on('receive', function ($serv, $fd, $from_id, $data) {
    $serv->send($fd, "Server: ".$data);
});

//监听连接关闭事件
$serv->on('close', function ($serv, $fd) {
    echo "Client: Close.\n";
});

//启动服务器
$serv->start();

?>


下面写一个脚本去重启和停止服务端。（原理就是给mast进程发送信号）
<?php
    $options  = 's';
    $command = getopt($options);
    $pidFile = 'server.pid';
    if(isset($command['s'])){
        if($command['s']=='stop'){
            stop();
        }else{
            reload();
        }
    }else{
        die("请输入-s stop|reload");
    }

    function stop(){
        global $pidFile;
        if (file_exists($pidFile)) {
            $pid = file_get_contents($pidFile);

            if (!swoole_process::kill($pid, 0)) {
                echo "PID :{$pid} not exist \n";
                return false;
            }
            swoole_process::kill($pid);
            //等待5秒
            $time = time();
            $flag = false;
            while (true) {
                usleep(1000);
                if (!swoole_process::kill($pid, 0)) {
                    echo "server stop at " . date("y-m-d h:i:s") . "\n";
                    if (is_file($pidFile)) {
                        unlink($pidFile);
                    }
                    $flag = true;
                    break;
                } else {
                    if (time() - $time > 5) {
                        echo "stop server fail.try again \n";
                        break;
                    }
                }
            }
            return $flag;
        } else {
            echo "pid 文件不存在，请执行查找主进程pid,kill!\n";
            return false;
        }
    }

    function reload(){
        global $pidFile;
        if (file_exists($pidFile)) {
            $sig = SIGUSR1;
            $pid = file_get_contents($pidFile);
            if (!swoole_process::kill($pid, 0)) {
                echo "pid :{$pid} not exist \n";
                return;
            }
            swoole_process::kill($pid, $sig);
            echo "send server reload command at " . date("y-m-d h:i:s") . "\n";
        } else {
            echo "pid 文件不存在，请执行查找主进程pid,kill!\n";
        }
    }
?>