易失性和互锁之间的不一致

问：

以下是源代码：

public static class Volatile
{
   // ...
   public static ulong Read(ref ulong location);
   public static long Read(ref long location);
   public static double Read(ref double location);  
}

public static class Interlocked
{
   // ... Interlocked has only two Read methods as below:
   public static ulong Read(ref ulong location);
   public static long Read(ref long location);   
}

我这里有一些问题，为什么没有对应的“读取double”方法？Interlocked

“Read long”和“Read long”有什么区别。VolatileInterlocked