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最近研究<a class="replace_word" href="http://lib.csdn.net/base/mysql" rel="nofollow" style="color:rgb(223,52,52); text-decoration:none; font-weight:bold" target="_blank" title="MySQL知识库">MySQL</a>源码，各种锁，各种互斥，好在我去年认真学了《unix环境高级编程》， 虽然已经忘得差不多了，但是学过始终是学过，拿起来也快。写这篇文章的目的就是总结<a class="replace_word" href="http://lib.csdn.net/base/linux" rel="nofollow" style="color:rgb(223,52,52); text-decoration:none; font-weight:bold" target="_blank" title="Linux知识库">Linux</a> 下多线程编程，作为日后的参考资料。</p>
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本文将介绍<a class="replace_word" href="http://lib.csdn.net/base/linux" rel="nofollow" style="color:rgb(223,52,52); text-decoration:none; font-weight:bold" target="_blank" title="Linux知识库">linux</a>系统下多线程编程中，线程同步的各种方法。包括：</p>
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<li style="padding:0.2em 0px; margin:0px; border:none; outline:none"><a href="http://mingxinglai.com/cn/2013/06/mutil-threads/#1" rel="nofollow" style="color:rgb(221,0,0); text-decoration:none; padding:0px; margin:0px; border:none; outline:none" target="_blank">互斥量(mutex)</a></li><li style="padding:0.2em 0px; margin:0px; border:none; outline:none"><a href="http://mingxinglai.com/cn/2013/06/mutil-threads/#2" rel="nofollow" style="color:rgb(221,0,0); text-decoration:none; padding:0px; margin:0px; border:none; outline:none" target="_blank">读写锁</a></li><li style="padding:0.2em 0px; margin:0px; border:none; outline:none"><a href="http://mingxinglai.com/cn/2013/06/mutil-threads/#3" rel="nofollow" style="color:rgb(221,0,0); text-decoration:none; padding:0px; margin:0px; border:none; outline:none" target="_blank">条件变量</a></li><li style="padding:0.2em 0px; margin:0px; border:none; outline:none"><a href="http://mingxinglai.com/cn/2013/06/mutil-threads/#4" rel="nofollow" style="color:rgb(221,0,0); text-decoration:none; padding:0px; margin:0px; border:none; outline:none" target="_blank">信号量</a></li><li style="padding:0.2em 0px; margin:0px; border:none; outline:none"><a href="http://mingxinglai.com/cn/2013/06/mutil-threads/#5" rel="nofollow" style="color:rgb(221,0,0); text-decoration:none; padding:0px; margin:0px; border:none; outline:none" target="_blank">文件互斥</a></li></ol>
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在介绍不同的线程同步的方法之前，先简单的介绍一下进程和线程的概念， 它们的优缺点，线程相关的API，读者——写者问题和哲学家就餐问题。</p>
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<a name="t0" style="color:rgb(51,102,153)" target="_blank"></a>基础知识</h1>
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<a name="t1" style="color:rgb(51,102,153)" target="_blank"></a>1. 进程和线程</h3>
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进程（process）是指在系统中正在运行的一个应用程序，是系统资源分配的基本单位，在内存 中有其完备的数据空间和代码空间，拥有完整的虚拟空间地址。一个进程所拥有的数据和变量只 属于它自己。</p>
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线程（thread）是进程内相对独立的可执行单元，所以也被称为轻量进程（lightweight processes ）；是<a class="replace_word" href="http://lib.csdn.net/base/operatingsystem" rel="nofollow" style="color:rgb(223,52,52); text-decoration:none; font-weight:bold" target="_blank" title="操作系统知 |
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