[PHP] 简单多进程并发

企邮搬家进程管理逻辑,经过简化后的功能实现

<?php
//守护进程
umask(0); //把文件掩码清0
  
if (pcntl_fork() != 0){ //是父进程，父进程退出
        exit();
}       
  
posix_setsid();//设置新会话组长，脱离终端
  
if (pcntl_fork() != 0){ //是第一子进程，结束第一子进程   
        exit();
}       
  
chdir("/"); //改变工作目录
 
 
//开启五个子进程
$worker=0;
do {
 
        for($i=0;$i<6;$i++){
                $pid = pcntl_fork();
                if ($pid == -1) {
                        return false;
                } elseif ($pid == 0) { //子进程,在此处处理业务逻辑
 
                        //TODO
 
                        sleep(60);    
                        exit;
                } else { // parent
                        $worker++;
                        if($worker>5){
                                $id = pcntl_wait($status);
                                if ($id > 0) {
                                        $worker--;    
                                }   
                        }   
                }   
        }   
        usleep(200000);
 
} while (true);
 
while ($worker > 0) {
        $id = pcntl_wait($status);
        if ($id > 0) {
                $worker--;    
        }   
}