【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 static 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

 

  信号处理增强版

<?php
declare(ticks=1);

class Worker
{

    public $count = 2;
    public $child_pid = [];
    public $is_moni = true;

    public function runAll()
    {
        $this->runMaster();
        $this->moniProcess();
    }

    //开启主进程
    public 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()) {  // ps -axO pgid
                throw new Exception("setsid fail");
            }

            for ($i = 0; $i < $this->count; $i++) {
                $this->runWorker();
            }

            @cli_set_process_title("master_process");
            pcntl_signal(SIGUSR1, array($this, 'signalHandler'));

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

    //开启子进程
    public function runWorker()
    {
        // unmask(0);
        $pid = pcntl_fork();
        if ($pid > 0) {
            $this->child_pid[$pid] = 1;
            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 (true) {
            $pid = pcntl_wait($status, WNOHANG);
            if ($pid > 0 && $this->is_moni) {
                $this->runWorker();
            } elseif ($pid > 0 && !$this->is_moni) {
                //主进程发起退出
                unset($this->child_pid[$pid]);
                if (!count($this->child_pid)) {
                    exit;
                }
            } else {
                continue;
            }
            sleep(1);
        }
    }


    //收到信号回调
    public function signalHandler($signo)
    {
        switch ($signo) {
            case SIGUSR1:
                file_put_contents('sign.txt', json_encode($this->child_pid), FILE_APPEND);
                $this->is_moni = false;
                foreach ($this->child_pid as $key => $value) {
                    posix_kill($key, SIGKILL);
                }
                break;
        }
    }

}

(new Worker)->runAll();

运行起来之后执行以下命令可以关闭守护进程

 kill -10 主进程id