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	<a class="post-link" href="http://dasheyuan.com/post/cpp-11-multithreading-part-2/">
		<p class="post-meta left">2017年10月7日</p>
		
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		<h3 class="h2 post-title">C&#43;&#43;11多线程编程(2) </h3>
		<p class="post-summary"><h2 id="目录">目录</h2>

<ol>
<li>多线程创建和参数传递</li>
<li>多线程条件竞争及其解决方法</li>
<li>多线程事件处理、条件变量</li>
<li>多线程返回值</li>
<li>线程池</li>
</ol>

<h3 id="3-1-多线程事件处理">3.1 多线程事件处理</h3>

<p>在第1部分中对多线程的创建、参数传递的使用作了说明，另外对线程间数据共享导致竞争条件异常进行了分析，并给出互斥锁的解决方式。我继续参考thisPointer的教程，深入多线程的事件处理。<br />
什么是多线程的事件处理？有时候，线程往往需要等待类似于条件为真或另一个线程任务完成的事件，这就是多线程的事件处理。先来看一个程序需求。</p>

<h4 id="3-1-1-功能分析">3.1.1 功能分析</h4>

<p>现在我们需要实现一个网络编程的客户端程序，这个程序的任务如下：</p>

<ol>
<li>连接服务器</li>
<li>从XML文件加载数据</li>
<li>发送加载的数据</li>
</ol>

<p>分析易知任务1与其他两个任务是独立的，但任务3依赖于任务2。任务1和任务2可以设计在两个平行执行的线程上实现，从而提升程序的性能。<br />
下面我们将使用多线程的方式设计客户端程序。这个程序包含两个线程，线程1需要完成的任务是：</p>

<ul>
<li>连接服务器</li>
<li>等待线程2加载XML文件的数据</li>
<li>发送加载的数据</li>
</ul>

<p>线程2需要完成的任务是：</p>

<ul>
<li>从XML文件中加载数据</li>
<li>通知其他等待该数据的线程</li>
</ul>

<p><img src="http://thispointer.com/wp-content/uploads/2015/06/first.png" alt="demo" />
</p></p>
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