php pthreads 使用的那些事儿
1. 编译安装PHP
下载: wget http://cn2.php.net/distributions/php-5.6.30.tar.gz ./configure --prefix=/opt/php56-zts --enable-pcntl --with-config-file-path=/opt/php56-zts/etc/ --with-libdir=lib64 --with-curl --with-mcrypt --with-openssl --enable-bcmath --enable-maintainer-zts make && make install
2. 编译安装 Pthreads
下载: wget http://pecl.php.net/get/pthreads-2.0.5.tgz ./configure --with-php-config=/opt/php56-zts/bin/php-config make && make install
注: 请不要使用最新版本的 pthreads-3.1.6.tgz, 此版本浪费了我 一天时间, 也没安装上去 , 因为3.x 是对php7.x的版本的
Pthreads 官方文档:
http://php.net/manual/zh/book.pthreads.php
官方简单例子:
<?php
class My extends Thread{
function run(){
for($i=1;$i<10;$i++){
echo Thread::getCurrentThreadId() . "\n";
sleep(2); // <------
}
}
}
for($i=0;$i<2000;$i++){
$pool[] = new My();
}
foreach($pool as $worker){
$worker->start();
}
foreach($pool as $worker){
$worker->join();
}
?>
<?php
class Request extends Thread {
public $url;
public $data;
public function __construct($url) {
$this->url = $url;
}
public function run() {
// 线程处理一个耗时5秒的任务
for($i=0;$i<5;$i++) {
echo '线程: '.date('H:i:s')."\n";
sleep(1);
}
$response = file_get_contents($this->url);
if ($response) {
$this->data = array($response);
}
echo "线程: 任务完成\n";
}
}
$request = new Request('hello.html');
// 运行线程:start()方法会触发run()运行
if ($request->start()) {
// 主进程处理一个耗时10秒的任务,此时线程已经工作
for($i=0;$i<10;$i++) {
echo '进程: '.date('H:i:s')."\n";
sleep(1);
}
// 同步线程并输出线程返回的数据
$request->join();
echo '线程返回数据: '.$request->data[0];
}
/*
如果顺序执行,合计时间将是15秒,借助线程,则只需10秒.
生成文件: echo 'Hello' > hello.html
运行计时: time php req.php
查看线程: ps -efL|head -n1 && ps -efL|grep php
*/
查看线程:
ps -efL|head -n1 && ps -efL|grep php
UID为User ID.
PID为processid,进程标识符
PPID为 parent processid,父进程标识符2,
LWP为light weight process orthread, 轻量级进程,即线程标识符
NLWP为,number oflwps(threads) in the process, 线程的数量
不错的实例, 对理解php多线程很有帮助:
<?php
class vote extends Thread {
public $res = '';
public $url = array();
public $name = '';
public $runing = false;
public $lc = false;
public function __construct($name) {
$this->res = '暂无,第一次运行.';
$this->param = 0;
$this->lurl = 0;
$this->name = $name;
$this->runing = true;
$this->lc = false;
}
public function run() {
while ($this->runing) {
if ($this->param != 0) {
$nt = rand(1, 10);
echo "线程[{$this->name}]收到任务参数::{$this->param},需要{$nt}秒处理数据.\n";
$this->res = rand(100, 999);
sleep($nt);
$this->lurl = $this->param;
$this->param = '';
} else {
echo "线程[{$this->name}]等待任务..\n";
}
sleep(10);
}
}
}
//这里创建线程池.
$pool[] = new vote('a');
$pool[] = new vote('b');
$pool[] = new vote('c');
//启动所有线程,使其处于工作状态
foreach ($pool as $w) {
$w->start();
}
//派发任务给线程
for ($i = 1; $i < 10; $i++) {
$worker_content = rand(10, 99);
while (true) {
foreach ($pool as $worker) {
//参数为空则说明线程空闲
if ($worker->param=='') {
$worker->param = $worker_content;
echo "[{$worker->name}]线程空闲,放入参数{$worker_content},上次参数[{$worker->lurl}]结果[{$worker->res}].\n";
break 2;
}
}
sleep(1);
}
}
echo "所有线程派发完毕,等待执行完成.\n";
//等待所有线程运行结束
while (count($pool)) {
//遍历检查线程组运行结束
foreach ($pool as $key => $threads) {
if ($worker->param=='') {
echo "[{$threads->name}]线程空闲,上次参数[{$threads->lurl}]结果[{$threads->res}].\n";
echo "[{$threads->name}]线程运行完成,退出.\n";
//设置结束标志
$threads->runing = false;
unset($pool[$key]);
}
}
echo "等待中...\n";
sleep(1);
}
echo "所有线程执行完毕.\n";