【多进程】php实现 master-worker 守护多进程模式

<?php

class Worker{

    public static $count = 2;

    public static function runAll(){
        static::runMaster();
        static::moniProcess();
    }

    //开启主进程
    public static function runMaster(){
        //确保进程有最大操作权限
        unmask(0);
        $pid = pcntl_fork();
        if($pid > 0){
            echo "主进程进程 $pid \n";
            exit;
        }else if($pid == 0){
            if(-1 === posix_setsid()){
                    throw new Exception("setsid fail");
            }

            for ($i=0; $i < self::$count; $i++) {
                static::runWorker();
            }

            @cli_set_process_title("master_process");

        }else{
            throw new Exception("创建主进程失败");
        }
    } 

    //开启子进程
    public static function runWorker(){
        unmask(0);
        $pid = pcntl_fork();
        if($pid > 0){
            // echo "创建子进程 $pid \n";
        }else if($pid == 0){
            if(-1 === posix_setsid()){
                throw new Exception("setsid fail");
            }
            @cli_set_process_title("worker_process");
            while(1){
                sleep(1);
            }
        }else{
            throw new Exception("创建子进程失败");
        }
    }

    //监控worker进程
    public function moniProcess(){
        while( $pid = pcntl_wait($status)){
            if($pid == -1){
                break;
            }else{
                static::runWorker();
            }
        }
    }
}

Worker::runAll();

ps -aux
USER       PID %CPU %MEM    VSZ   RSS TTY      STAT START   TIME COMMAND
root         1  0.0  0.0  18200  3076 pts/0    Ss+  14:05   0:00 bash
root         6  0.0  0.0  18208  3252 pts/1    Ss   14:06   0:00 bash
root        19  0.0  0.0  18204  3248 pts/2    Ss+  14:11   0:00 bash
root        64  0.0  0.2 348488  8320 ?        Ss   15:32   0:00 master_process
root        65  0.0  0.2 348488  8400 ?        Ss   15:32   0:00 worker_process
root        66  0.0  0.2 348488  8400 ?        Ss   15:32   0:00 worker_process
root        67  0.0  0.0  36640  2804 pts/1    R+   15:32   0:00 ps -aux

执行命令 kill 65，杀死进程 65 则master_process 进程会再自动开启一个子进程

USER       PID %CPU %MEM    VSZ   RSS TTY      STAT START   TIME COMMAND
root         1  0.0  0.0  18200  3076 pts/0    Ss+  14:05   0:00 bash
root         6  0.0  0.0  18208  3252 pts/1    Ss   14:06   0:00 bash
root        19  0.0  0.0  18204  3248 pts/2    Ss+  14:11   0:00 bash
root        64  0.0  0.2 348488  8320 ?        Ss   15:32   0:00 master_process
root        66  0.0  0.2 348488  8400 ?        Ss   15:32   0:00 worker_process
root        68  0.0  0.1 348488  5796 ?        Ss   15:34   0:00 worker_process
root        69  0.0  0.0  36640  2728 pts/1    R+   15:34   0:00 ps -aux