Question

我对以下简化代码的结果感到困惑。

线程对象MyPool将实例化可变数量的MyWorker对象。当正确地实例化每个MyWorker对象时，它应在MyPool类中增加$ counter，以反映有多少个正确实例化的工作程序。

当从MyWorker对象内部调用时，递增计数函数（）函数似乎已执行（根据echo语句），但对$ counter属性没有影响。但是，从主线程调用相同的代码可以正常工作。

如何实现这个简单的概念？

<?php

error_reporting(E_ALL & ~E_NOTICE);

class MyPool extends Threaded
{
    public static $counter;
    public $workers;

    public function __construct()
    {
        self::$counter = (int) 0;

        $workers[] = new MyWorker();
        $workers[] = new MyWorker();
        $workers[] = new MyWorker();

        $workers[0]->start();
        $workers[1]->start();
        $workers[2]->start();
    }

    public static function getCounter()
    {
        return self::$counter;
    }

    public static function increaseCounter()
    {
        self::$counter++;
        echo "counter has been increased inside MyPool\n";
    }
}

class MyWorker extends Worker
{
    public function __construct()
    {
    }

    public function run()
    {
        // do something then
        $this->WorkerActive();
    }

    public function WorkerActive()
    {
        MyPool::$counter++;
        MyPool::increaseCounter();
    }
}

$MyPool = new MyPool();

echo "counter = ".MyPool::$counter."\n";
echo "counter = ".$MyPool->getCounter()."\n";
echo "counter = ".MyPool::getCounter()."\n";

MyPool::$counter++;
MyPool::increaseCounter();

echo "counter = ".MyPool::$counter."\n";
echo "counter = ".$MyPool->getCounter()."\n";
echo "counter = ".MyPool::getCounter()."\n";

输出为：

counter has been increased inside MyPool
counter has been increased inside MyPool
counter has been increased inside MyPool
counter = 0
counter = 0
counter = 0
counter has been increased inside MyPool
counter = 2
counter = 2
counter = 2

Answer 1

在pthreads中，静态属性是线程局部的，并且不在线程之间共享。将$ counter属性切换到对象范围会有所帮助。

PHP7 pthreads3问题：无法从实例化的Worker对象中增加Threaded类的公共属性

1 个答案: