swoole 1.7.3发布，增加PHP多进程管理模块

PHP的异步并行扩展swoole，最近增加了多进程管理模块swoole_process，用来替代PHP的pcntl扩展。

 

PHP自带的pcntl，存在很多不足，如：

 

• pcntl无法用在fpm/apache中
• pcntl没有提供进程间通信的功能
• pcntl不支持重定向标准输入和输出
• pcntl只提供了fork这样原始的接口，容易使用错误

swoole_process提供了比pcntl更强大的功能，更易用的面向对象风格API，使PHP在多进程编程方面更加轻松。

 

swoole_process提供的功能特性：

 

• swoole_process提供了基于unixsock的进程间通信，使用很简单只需调用recv/send即可
• swoole_process支持重定向标准输入和输出，在子进程内echo不会打印屏幕，而是写入管道，读键盘输入可以重定向为管道读取数据
• swoole_process允许用于fpm/apache的Web请求中
• 配合swoole_event模块，创建的PHP子进程可以异步的事件驱动模式
• swoole_process提供了exec接口，创建的进程可以执行其他程序，与原PHP父进程之间可以方便的通信
• swoole_process可以安全地用于fpm/apache环境下

代码示例：

$worker_num = 8;

for($i = 0; $i < $worker_num; $i++)
{
    $process = new swoole_process('callback_function', true);
    $pid = $process->start();
    $workers[$pid] = $process;
}

foreach($workers as $pid => $process)
{
    $process->write("hello worker[$pid]\n");
    echo "From Worker: ".$process->read();
}

for($i = 0; $i < $worker_num; $i++)
{
    $ret = swoole_process::wait();
    $pid = $ret['pid'];
    unset($workers[$pid]);
    echo "Worker Exit, PID=".$pid.PHP_EOL;
}

function callback_function(swoole_process $worker)
{
    //echo "Worker: start. PID=".$worker->pid."\n";
    //recv data from master
    $recv = $worker->read();
    echo "From Master: $recv\n";

    //send data to master
    $worker->write("hello master\n");

    sleep(2);
    $worker->exit(0);
}

 

子进程事件驱动模式

function callback_function_async(swoole_process $worker)
{
    //echo "Worker: start. PID=".$worker->pid."\n";
    //recv data from master
    $GLOBALS['worker'] = $worker;
    swoole_event_add($worker->pipe, function($pipe) {
        $worker = $GLOBALS['worker'];
        $recv = $worker->read();

        echo "From Master: $recv\n";

        //send data to master
        $worker->write("hello master\n");

        sleep(2);

        $worker->exit(0);
    });
}

 

PHP创建一个Python子进程，并与之通信

$process = new swoole_process('pyhon_process', true);
$pid = $process->start();

function pyhon_process(swoole_process $worker)
{
    $worker->exec('/usr/bin/python', array("echo.py"));
}

$process->write("hello world\n");
echo $process->read();

$ret = swoole_process::wait();
var_dump($ret);

 

Python程序echo.py

import sys

def main():
	s = raw_input()
	print "Python:" + s

main()