pcntl_fork_test.php

<?php
/**
 * Created by PhpStorm.
 * User: shellus-in
 * Date: 2017/9/28
 * Time: 17:50
 */

class Test
{
    protected $lockPath;
    protected $doUnLock = false;
    public function __destruct()
    {
        if ($this->doUnLock){
            @unlink($this->lockPath);
        }
    }

    public function __construct($filename)
    {
        $this->lockPath = $filename;

        if (file_exists($this->lockPath)){
            var_dump("err: lock exists");
            exit(1);
        }
        file_put_contents($this->lockPath, "running");
        $this->doUnLock=true;
        $this->work();
    }

    protected function work(){
        var_dump("debug: child precess working");
        die(0);
    }
}

if (!isset($argv[1])){
    var_dump("err: args invalid");
    exit(1);
}
$lockPath = $argv[1];

foreach (range(1,10) as $i){
    $pid = pcntl_fork();
    if ($pid === -1){
        var_dump("err: fork fail");
        exit(1);
    }

    if ($pid===0){
        var_dump("debug: precess id [$i] start");
        $instance = new Test($lockPath);
        unset($instance);
        exit(0);
    }else{
        pcntl_waitpid($pid, $status);
        $exitCode = pcntl_wexitstatus($status);
        var_dump("debug: precess id [$i] stop");

        if ($exitCode !== 0){
            break;
        }

    }
}

var_dump("debug: master precess done.");