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小編給大家分享一下swoole_process有什么用,希望大家閱讀完這篇文章之后都有所收獲,下面讓我們一起去探討吧!
swoole
swoole 的進(jìn)程之間有兩種通信方式,一種是消息隊(duì)列(queue),另一種是管道(pipe),對swoole_process
的研究在swoole中顯得尤為重要。
預(yù)備知識
IO多路復(fù)用
swoole 中的io多路復(fù)用表現(xiàn)為底層的 epoll進(jìn)程模型,在C語言中表現(xiàn)為 epoll 函數(shù)。
epoll 模型下會持續(xù)監(jiān)聽自己名下的素有socket 描述符 fd
當(dāng)觸發(fā)了 socket 監(jiān)聽的事件時,epoll 函數(shù)才會響應(yīng),并返回所有監(jiān)聽該時間的 socket 集合
epoll 的本質(zhì)是阻塞IO,它的優(yōu)點(diǎn)在于能同事處理大量socket連接
Event loop 事件循環(huán)
swoole 對 epoll 實(shí)現(xiàn)了一個Reactor線程模型封裝,設(shè)置了read事件和write事件的監(jiān)聽回調(diào)函數(shù)。(詳見swoole_event_add)
Event loop 是一個Reactor線程,其中運(yùn)行了一個epoll實(shí)例。
通過swoole_event_add將socket描述符的一個事件添加到epoll監(jiān)聽中,事件發(fā)生時將執(zhí)行回調(diào)函數(shù)
不可用于fpm環(huán)境下,因?yàn)閒pm在任務(wù)結(jié)束時可能會關(guān)掉進(jìn)程。
swoole_process
基于C語言封裝的進(jìn)程管理模塊,方便php來調(diào)用
內(nèi)置管道、消息隊(duì)列接口,方便實(shí)現(xiàn)進(jìn)程間通信
我們在php-fpm.conf配置文件中發(fā)現(xiàn),php-fpm中有兩種進(jìn)程池管理設(shè)置。
靜態(tài)模式 即初始化固定的進(jìn)程數(shù),當(dāng)來了一個請求時,從中選取一個進(jìn)程來處理。
動態(tài)模式 指定最小、最大進(jìn)程數(shù),當(dāng)請求量過大,進(jìn)程數(shù)不超過最大限制時,新增線程去處理請求
接下來用swoole代碼來實(shí)現(xiàn),這里只是為理解swoole_process、進(jìn)程間通信、定時器等使用,實(shí)際情況使用封裝好的swoole_server來實(shí)現(xiàn)task任務(wù)隊(duì)列池會更方便。
假如有個定時投遞的任務(wù)隊(duì)列:
<?php/** * 動態(tài)進(jìn)程池,類似fpm * 動態(tài)新建進(jìn)程 * 有初始進(jìn)程數(shù),最小進(jìn)程數(shù),進(jìn)程不夠處理時候新建進(jìn)程,不超過最大進(jìn)程數(shù) */// 一個進(jìn)程定時投遞任務(wù)/** * 1. tick * 2. process及其管道通訊 * 3. event loop 事件循環(huán) */class processPool{ private $pool; /** * @var swoole_process[] 記錄所有worker的process對象 */ private $workers = []; /** * @var array 記錄worker工作狀態(tài) */ private $used_workers = []; /** * @var int 最小進(jìn)程數(shù) */ private $min_woker_num = 5; /** * @var int 初始進(jìn)程數(shù) */ private $start_worker_num = 10; /** * @var int 最大進(jìn)程數(shù) */ private $max_woker_num = 20; /** * 進(jìn)程閑置銷毀秒數(shù) * @var int */ private $idle_seconds = 5; /** * @var int 當(dāng)前進(jìn)程數(shù) */ private $curr_num; /** * 閑置進(jìn)程時間戳 * @var array */ private $active_time = []; public function __construct() { $this->pool = new swoole_process(function () { // 循環(huán)建立worker進(jìn)程 for ($i = 0; $i < $this->start_worker_num; $i++) { $this->createWorker(); } echo '初始化進(jìn)程數(shù):' . $this->curr_num . PHP_EOL; // 每秒定時往閑置的worker的管道中投遞任務(wù) swoole_timer_tick(1000, function ($timer_id) { static $count = 0; $count++; $need_create = true; foreach ($this->used_workers as $pid => $used) { if ($used == 0) { $need_create = false; $this->workers[$pid]->write($count . ' job'); // 標(biāo)記使用中 $this->used_workers[$pid] = 1; $this->active_time[$pid] = time(); break; } } foreach ($this->used_workers as $pid => $used) // 如果所有worker隊(duì)列都沒有閑置的,則新建一個worker來處理 if ($need_create && $this->curr_num < $this->max_woker_num) { $new_pid = $this->createWorker(); $this->workers[$new_pid]->write($count . ' job'); $this->used_workers[$new_pid] = 1; $this->active_time[$new_pid] = time(); } // 閑置超過一段時間則銷毀進(jìn)程 foreach ($this->active_time as $pid => $timestamp) { if ((time() - $timestamp) > $this->idle_seconds && $this->curr_num > $this->min_woker_num) { // 銷毀該進(jìn)程 if (isset($this->workers[$pid]) && $this->workers[$pid] instanceof swoole_process) { $this->workers[$pid]->write('exit'); unset($this->workers[$pid]); $this->curr_num = count($this->workers); unset($this->used_workers[$pid]); unset($this->active_time[$pid]); echo "{$pid} destroyed\n"; break; } } } echo "任務(wù){(diào)$count}/{$this->curr_num}\n"; if ($count == 20) { foreach ($this->workers as $pid => $worker) { $worker->write('exit'); } // 關(guān)閉定時器 swoole_timer_clear($timer_id); // 退出進(jìn)程池 $this->pool->exit(0); exit(); } }); }); $master_pid = $this->pool->start(); echo "Master $master_pid start\n"; while ($ret = swoole_process::wait()) { $pid = $ret['pid']; echo "process {$pid} existed\n"; } } /** * 創(chuàng)建一個新進(jìn)程 * @return int 新進(jìn)程的pid */ public function createWorker() { $worker_process = new swoole_process(function (swoole_process $worker) { // 給子進(jìn)程管道綁定事件 swoole_event_add($worker->pipe, function ($pipe) use ($worker) { $data = trim($worker->read()); if ($data == 'exit') { $worker->exit(0); exit(); } echo "{$worker->pid} 正在處理 {$data}\n"; sleep(5); // 返回結(jié)果,表示空閑 $worker->write("complete"); }); }); $worker_pid = $worker_process->start(); // 給父進(jìn)程管道綁定事件 swoole_event_add($worker_process->pipe, function ($pipe) use ($worker_process) { $data = trim($worker_process->read()); if ($data == 'complete') { // 標(biāo)記為空閑// echo "{$worker_process->pid} 空閑了\n"; $this->used_workers[$worker_process->pid] = 0; } }); // 保存process對象 $this->workers[$worker_pid] = $worker_process; // 標(biāo)記為空閑 $this->used_workers[$worker_pid] = 0; $this->active_time[$worker_pid] = time(); $this->curr_num = count($this->workers); return $worker_pid; }}new processPool();
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