今天突然理解了“volatile”

首先咱们可以看一下MSDN对volatile的定义：
The volatile keyword indicates that a field can be modified in the program by something such as the operating system, the hardware, or a concurrently executing thread.

The system always reads the current value of a volatile object at the point it is requested, even if the previous instruction asked for a value from the same object. Also, the value of the object is written immediately on assignment.

The volatile modifier is usually used for a field that is accessed by multiple threads without using the lock statement to serialize access. Using the volatile modifier ensures that one thread retrieves the most up-to-date value written by another thread.

然后呢，咱们可以看到在Singleton模式中对多线程的优化

using System;
2 今天突然理解了“volatile”

using System.Configuration;
3 今天突然理解了“volatile”

namespace HeadFirstDesignPatterns.Singleton.InterestRate
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