PHP多線程編程之管道通信實例
PHP多線程編程之管道通信,實例分析了管道通信的原理與相關(guān)使用技巧,具有一定參考借鑒價值,需要的朋友可以參考下.
本文實例講述了PHP多線程編程之管道通信用法。分享給大家供大家參考。具體分析如下：
一個線程如果是個人英雄主義，那么多線程就是集體主義，你不再是一個獨行俠，而是一個指揮家。
管道通信：
1. 管道可以認為是一個隊列，不同的線程都可以往里面寫東西，也都可以從里面讀東西。寫就是
在隊列末尾添加，讀就是在隊頭刪除。
2. 管道一般有大小，默認一般是4K，也就是內(nèi)容超過4K了，你就只能讀，不能往里面寫了。
3. 默認情況下，管道寫入以后，就會被阻止，直到讀取他的程序讀取把數(shù)據(jù)讀完。而讀取線程也會被阻止，
直到有進程向管道寫入數(shù)據(jù)。當然，你可以改變這樣的默認屬性，用stream_set_block 函數(shù)，設(shè)置成非阻斷模式。
下面是我分裝的一個管道的類（這個類命名有問題，沒有統(tǒng)一，沒有時間改成統(tǒng)一的了，我一般先寫測試代碼，最后分裝，所以命名上可能不統(tǒng)一）：
<?php
class Pipe
{
public $fifoPath;
private $w_pipe;
private $r_pipe;
/**
* 自動創(chuàng)建一個管道
*
* @param string $name 管道名字
* @param int $mode 管道的權(quán)限，默認任何用戶組可以讀寫
*/
function __construct($name = 'pipe', $mode = 0666)
{
$fifoPath = "/tmp/$name." . posix_getpid();
if (!file_exists($fifoPath)) {
if (!posix_mkfifo($fifoPath, $mode)) {
error("create new pipe ($name) error.");
return false;
}
} else {
error( "pipe ($name) has exit.");
return false;
}
$this->fifoPath = $fifoPath;
}
/pic/pic/pic/pic/pic/pic/pic/pic/pic/pic/pic/pic/pic/pic/pic/pic/pic/pic/pic/pic/pic/pic/pic/pic/pic/
/pic/p>
/pic/pic/pic/pic/pic/pic/pic/pic/pic/pic/pic/pic/pic/pic/pic/pic/pic/pic/pic/pic/pic/pic/pic/pic/pic/
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);
}
/pic/pic/pic/pic/pic/pic/pic/pic/pic/pic/pic/pic/pic/pic/pic/pic/pic/pic/pic/pic/pic/pic/pic/pic/pic/pic/pic/pic/
/pic/ 讀管道相關(guān)函數(shù)開始
/pic/pic/pic/pic/pic/pic/pic/pic/pic/pic/pic/pic/pic/pic/pic/pic/pic/pic/pic/pic/pic/pic/pic/pic/pic/pic/pic/pic/p>
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)) {
/pic/p>
$data .= fread($r_pipe, 1024);
}
fclose($r_pipe);
return $data;
}
function close_read()
{
return fclose($this->r_pipe);
}
/**
* 刪除管道
*
* @return boolean is success
*/
function rm_pipe()
{
return unlink($this->fifoPath);
}
}
?>
/*
有了這個類，就可以實現(xiàn)簡單的管道通信了。*/
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