我一直在尝试用多线程和并行处理，我需要一个柜台做一些基本的计算和处理速度的统计分析。为了避免出现同时使用我的班，我在我的课堂上使用的锁声明私有变量：

I've been experimenting with multi threading and parallel processing and I needed a counter to do some basic counting and statistic analysis of the speed of the processing. To avoid problems with concurrent use of my class I've used a lock statement on a private variable in my class:

private object mutex = new object();

public void Count(int amount)
{
 lock(mutex)
 {
  done += amount;
 }
}

不过，我不知道......多么昂贵的锁定变量？什么是对性能的负面影响？

But I was wondering... how expensive is locking a variable? What are the negative effects on performance?

推荐答案

下面是的文章的进入成本。简短的回答为50ns。

Here is an article that goes into the cost. Short answer is 50ns.