在 Swoole-2.1.2 版本中我们将 Server 的进程管理模块封装成了 PHP 类，现在可以在 PHP 代码中使用 Swoole 的进程管理器了。
在实际项目中经常需要写一些长期运行的脚本，如基于 redis 、 kafka 、 rabbitmq 实现的多进程队列消费者，多进程爬虫等等。程序员需要使用 pcntl 和 posix 相关的扩展库实现多进程编程，需要开发者具备深厚的 Linux 系统编程功底，否则很容易出现问题。
Swoole 提供的进程管理器来自于 Swoole\Server ，经过大量生产项目验证，稳定性和健壮性都非常高。可大大简化多进程脚本编程工作。
一、 创建进程池
在 PHP 代码中使用 new Swoole\Process\Pool 即可创建一个进程池， 构造方法 的第一个参数传入工作进程的数量。使用 on 方法设置 WorkerStart 即可在工作进程启动时执行指定的代码，可以在这里进行 while(true) 循环从 redis 队列中获取任务并处理。使用 start 方法启动所有进程，管理器开始进入 wait 状态。
$workerNum = 10;$pool = new Swoole\Process\Pool($workerNum);$pool->on("WorkerStart", function ($pool, $workerId) { echo "Worker#{$workerId} is started\n"; $redis = new Redis(); $redis->pconnect('127.0.0.1', 6379); $key = "key1"; while (true) { $msgs = $redis->brpop($key, 2); if ( $msgs == null) continue; var_dump($msgs); }});$pool->on("WorkerStop", function ($pool, $workerId) { echo "Worker#{$workerId} is stopped\n";});$pool->start(); 使用进程管理器，可以保证工作进程的稳定性。
某个工作进程遇到致命错误、主动退出时管理器会进行回收，避免出现僵尸进程
工作进程退出后，管理器会自动拉起、创建一个新的工作进程
二、信号处理
Swoole 进程管理器自带了信号处理，向管理器进程发送：
SIGTERM 信号：中止服务，向所有工作进程发送 SIGTERM 关闭进程
SIGUSR1 信号：重启工作进程，管理器会逐个重启工作进程
在工作进程中可以配合使用 pcntl_signal 和 pcntl_signal_dispatch 实现信号处理。
$pool->on("WorkerStart", function ($pool, $workerId) { $running = true; pcntl_signal(SIGTERM, function () use (&$running) { $running = false; }); echo "Worker#{$workerId} is started\n"; $redis = new Redis(); $redis->pconnect('127.0.0.1', 6379); $key = "key1"; while ($running) { $msgs = $redis->brpop($key, 2); pcntl_signal_dispatch(); if ( $msgs == null) continue; var_dump($msgs); }}); 三、任务投递
Swoole 进程管理器自带了消息队列和 TCP-Socket 消息投递的支持。可设置监听系统队列或者 TCP 端口，接收任务数据。此项功能是可选的，要使用任务投递功能，需要对进程池对象设置 onMessage 回调。
消息队列
$pool = new Swoole\Process\Pool(2, SWOOLE_IPC_ msg QUEUE, 0x7000001);$pool->on("WorkerStart", function ($pool, $workerId) { echo "Worker#{$workerId} is started\n";});$pool->on("Message", function ($pool, $message) { echo "Message: {$message}\n";});$pool->start(); 需要在构造方法的第二个参数传入SWOOLE_IPC_MSGQUEUE，第三个参数设置监听的消息队列KEY。其他程序中使用消息队列相关API就可以向工作进程投递任务了。
TCP 端口
$pool = new Swoole\Process\Pool(2, SWOOLE_IPC_SOCKET);$pool->on("WorkerStart", function ($pool, $workerId) { echo "Worker#{$workerId} is started\n";});$pool->on("Message", function ($pool, $message) { echo "Message: {$message}\n";});$pool->listen('127.0.0.1', 8089);$pool->start(); 使用 TCP端口 监听，需要设置构造方法的第二个参数为SWOOLE_IPC_SOCKET，并使用listen方法设置监听的主机和端口。
底层使用了4字节长度+包体的协议。其他程序中向此端口发送数据时，需要在数据包之前增加一个长度字段。
$ fp = stream_socket_client("tcp://127.0.0.1:8089", $errno, $errstr) or die("error: $errstr\n");$msg = json_encode(['data' => 'hello', 'uid' => 1991]);fwrite($fp, pack('N', strlen($msg)).$msg);fclose($fp); 
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