随笔- 454 文章- 302 评论- 28 阅读- 65万

创建第一个子进程、获取子进程ID、回收子进程

https://wiki.swoole.com/wiki/page/p-process.html

echo "当前进程ID:".posix_getpid().PHP_EOL; //获取了进程ID
cli_set_process_title("mymain"); //设置了进程名称

$child=new \Swoole\Process(function(\Swoole\Process $p){
    echo "我是子进程,ID是“; 
});

$child_pid=$child->start();

 
while(true) //写个死循环，让进程不退出
{
    sleep(1);
}

<?php

echo "当前进程ID:".posix_getpid().PHP_EOL; //获取了进程ID
cli_set_process_title("mymain"); //设置了进程名称

$child=new \Swoole\Process(function(){
    cli_set_process_title("mychild"); //设置了进程名称
    echo "我是一个子进程,ID=".posix_getpid().PHP_EOL;
    while(true) //写个死循环，让进程不退出
    {
        sleep(1);
    }
});
$child->start();

\Swoole\Process::wait();

while(true) //写个死循环，让进程不退出
{
    sleep(1);
}

[root@bogon ~]# ps -ef|grep my
root      1903  1707  0 15:05 pts/0    00:00:00 mymain
root      1904  1903  0 15:05 pts/0    00:00:00 mychild
root      1906  1804  0 15:05 pts/1    00:00:00 grep --color=auto my

wait函数式阻塞的只有子进程结束才会往下执行

---------

重定向子进程标准输出

父进程获取子进程数据初步。。。。。

<?php
echo "当前进程ID:".posix_getpid().PHP_EOL; //获取了进程ID

cli_set_process_title("mymain");

$child = new  \Swoole\Process(function(){
    cli_set_process_title("mychild");
    echo "我是一个子进程,ID=".posix_getpid().PHP_EOL;
    while(true){
        echo "my name is ";
       sleep(1) ;
    }
},true);

$child->start();
\Swoole\Process::wait(false);
while(true){
    echo $child->read()." sunlong".PHP_EOL;
    sleep(1);
}

[root@bogon swoole]# php7 ./poll.php
当前进程ID:2576
我是一个子进程,ID=2577
my name is  sunlong
my name is  sunlong
my name is  sunlong
my name is  sunlong
my name is  sunlong
my name is  sunlong
♥

多个子进程的问题：僵尸进程

<?php


use Swoole\Process;

echo "当前进程ID:".posix_getpid().PHP_EOL; //获取了进程ID
cli_set_process_title("mymain"); //设置了进程名称


$child1=new Process(function(){
    cli_set_process_title("mychild1"); //设置了进程名称
    while(true) //写个死循环，让进程不退出
        sleep(1);
});
$child1->start();

$child2=new Process(function(){
    cli_set_process_title("mychild2"); //设置了进程名称
});
$child2->start();


Swoole\Process::wait();

由于child2子进程迅速推出导致整个程序退出，child1 就变成了僵尸进程

[root@bogon swoole]# php7 ./poll.php
当前进程ID:3014
[root@bogon swoole]#

[root@bogon ~]# ps -ef|grep my
root      3015     1  0 16:57 pts/0    00:00:00 mychild1
root      3018  1804  0 16:57 pts/1    00:00:00 grep --color=auto my

正确退出方式应该像python的join一样等待所有子进程都退出才行

修改：

<?php


use Swoole\Process;

echo "当前进程ID:".posix_getpid().PHP_EOL; //获取了进程ID
cli_set_process_title("mymain"); //设置了进程名称


$child1=new Process(function(){
    cli_set_process_title("mychild1"); //设置了进程名称
    while(true) //写个死循环，让进程不退出
        sleep(1);
});
$child1->start();

$child2=new Process(function(){
    cli_set_process_title("mychild2"); //设置了进程名称
});
$child2->start();


Swoole\Process::wait();
Swoole\Process::wait();

增加一个waitI()

此时mychild1会阻塞住 huang住

[root@bogon ~]# ps -ef|grep my
root      3091  1707  1 17:01 pts/0    00:00:00 mymain
root      3092  3091  0 17:01 pts/0    00:00:00 mychild1
root      3095  1804  0 17:01 pts/1    00:00:00 grep --color=auto my

正确姿势用信号来设置异步信号监听

Process::signal(SIGCHLD, function($sig) {
    //必须为false，非阻塞模式
    while($ret =  Process::wait(false)) {
        var_dump($ret);
    }
});

[root@bogon swoole]# php7 ./poll.php
当前进程ID:3115
array(3) {
  ["pid"]=>
  int(3117)
  ["code"]=>
  int(0)
  ["signal"]=>
  int(0)
}

信号说明： https://wiki.swoole.com/wiki/page/158.html https://wiki.swoole.com/wiki/page/362.html

一个最简单的例子：我们按下键盘Ctrl+C，我们的进程就停止了。这就是信号信号是进程间通信机制中唯一的异步通信机制，一个进程不必通过任何操作来等待信号的到达，事实上，进程也不知道信号到底什么时候到达。进程之间可以互相通过系统调用kill发送软中断信号

----------------在子进程中运行httpserver 修改进程名称

<?php


use Swoole\Process;

echo "当前进程ID:".posix_getpid().PHP_EOL; //获取了进程ID
cli_set_process_title("mymain"); //设置了进程名称


$child1=new Process(function(){
    $http = new Swoole\Http\Server("0.0.0.0","80");
    $http->set(["worker_num"=>1]);
    $http->on("request",function($req,$res){
            $res->end("myhttp");
    });
    $http->on("start",function($server){
        cli_set_process_title("mymaster"); //设置了进程名称
    });
    $http->on("managerstart",function($server){
        cli_set_process_title("mymanager"); //设置了进程名称
    });
    $http->on("workerstart",function($server){
        cli_set_process_title("myworker"); //设置了进程名称
    });
    $http->start();
});
$child1->start();



Process::signal(SIGCHLD, function($sig) {
    //必须为false，非阻塞模式
    while($ret =  Process::wait(false)) {
        var_dump($ret);
    }
});

[root@bogon ~]# ps -ef |grep my
root      1858  1695  0 15:57 pts/0    00:00:00 mymain
root      1859  1858  4 15:57 pts/0    00:00:00 mymaster
root      1860  1859  1 15:57 pts/0    00:00:00 mymanager
root      1862  1860  0 15:57 pts/0    00:00:00 myworker
root      1864  1749  0 15:57 pts/1    00:00:00 grep --color=auto my

--------监控文件变动进程感知

----------------------------------mysql简易巡检监控

检查连接数

select count(*) from information_schema.processlist


线程检查
select * from information_schema.GLOBAL_STATUS where Variable_name like 'Thread%‘

Thread_cached：线程池中还有多少可以被复用的线程
Thread_connected：和show processlist一样
Thread_created：新创建的thread
Thread_running：正在运行的连接(非sleep)

代码：

<?php
require "vendor/autoload.php";
use Swoole\Process;
use Swoole\Coroutine\Mysql as MySQL;
echo "当前进程ID:".posix_getpid().PHP_EOL; //获取了进程ID
cli_set_process_title("mymain"); //设置了进程名称


$child1=new Process(function(){
    cli_set_process_title("mychild"); //设置了进程名称
    $mysql=new MySQL();
    $conn=$mysql->connect(['host' => '192.168.29.1', 'user' => 'shenyi', 'password' => '123123', 'database' => 'information_schema',]);
    $checkConnect="select 1";
    $checkProcessCount="select count(*) from information_schema.processlist";
    $checkThead="select * from information_schema.GLOBAL_STATUS where Variable_name like 'Thread%'";
    while(true){
        $checkResult[]=date('Y-m-d h:i:s');
        try{
            sleep(3);
            $mysql->query($checkConnect);
            $checkResult[]="检查连接正常";
            $res=$mysql->query($checkProcessCount);
            $checkResult[]="当前连接数: ".$res[0]["c"];

            $res=$mysql->query($checkThead);
            $checkResult[]="检查线程情况";
            foreach ($res as  $row){
                foreach($row as $key=>$value){
                    $checkResult[]=$key.":".$value;
                }
            }
            $checkResult[]="-----------------------------------------------";

            echo implode(PHP_EOL,$checkResult);
        }catch (Exception $exception){
            echo $exception->getMessage().PHP_EOL;
        }

    }





},false,0,true);
$child1->start();



Process::signal(SIGCHLD, function($sig) {
    //必须为false，非阻塞模式
    while($ret =  Process::wait(false)) {
        //var_dump($ret);
    }
});