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Homephp教程php手册PHP多线程编程之管道通信实例分析

PHP多线程编程之管道通信实例分析

Jun 06, 2016 pm 08:07 PM
phpMultithreadingpipelineprogrammingcommunication

这篇文章主要介绍了PHP多线程编程之管道通信,实例分析了管道通信的原理与相关使用技巧,具有一定参考借鉴价值,需要的朋友可以参考下

本文实例讲述了PHP多线程编程之管道通信用法。分享给大家供大家参考。具体分析如下:

一个线程如果是个人英雄主义,那么多线程就是集体主义,你不再是一个独行侠,而是一个指挥家。

管道通信:
1. 管道可以认为是一个队列,,不同的线程都可以往里面写东西,也都可以从里面读东西。写就是
在队列末尾添加,读就是在队头删除。
 
2. 管道一般有大小,默认一般是4K,也就是内容超过4K了,你就只能读,不能往里面写了。
 
3. 默认情况下,管道写入以后,就会被阻止,直到读取他的程序读取把数据读完。而读取线程也会被阻止,
   直到有进程向管道写入数据。当然,你可以改变这样的默认属性,用stream_set_block  函数,设置成非阻断模式。
 
下面是我分装的一个管道的类(这个类命名有问题,没有统一,没有时间改成统一的了,我一般先写测试代码,最后分装,所以命名上可能不统一):

fifoPath = $fifoPath; } /////////////////////////////////////////////////// // 写管道函数开始 /////////////////////////////////////////////////// function open_write() { $this->w_pipe = fopen($this->fifoPath, 'w'); if ($this->w_pipe == NULL) { error("open pipe {$this->fifoPath} for write error."); return false; } return true; } function write($data) { return fwrite($this->w_pipe, $data); } function write_all($data) { $w_pipe = fopen($this->fifoPath, 'w'); fwrite($w_pipe, $data); fclose($w_pipe); } function close_write() { return fclose($this->w_pipe); } ///////////////////////////////////////////////////////// /// 读管道相关函数开始 //////////////////////////////////////////////////////// function open_read() { $this->r_pipe = fopen($this->fifoPath, 'r'); if ($this->r_pipe == NULL) { error("open pipe {$this->fifoPath} for read error."); return false; } return true; } function read($byte = 1024) { return fread($this->r_pipe, $byte); } function read_all() { $r_pipe = fopen($this->fifoPath, 'r'); $data = ''; while (!feof($r_pipe)) { //echo "read one K\n"; $data .= fread($r_pipe, 1024); } fclose($r_pipe); return $data; } function close_read() { return fclose($this->r_pipe); } /** * 删除管道 * * @return boolean is success */ function rm_pipe() { return unlink($this->fifoPath); } } ?> /* 有了这个类,就可以实现简单的管道通信了。*/

希望本文所述对大家的php程序设计有所帮助。

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