在InterLocked.CompareExchange之前读取值

Question

我在InterLocked的C＃用法中看到以下代码：

class MyObj {
// some class code .. 
int myVal
public void foo()
{
    int currVal = 0, newVal = 0;
    do
    {
        currVal = this.myVal;  // I have the question here ?
        newVal = this.newValue(currVal);
    } while (currVal != InterLocked.CompareExchange(ref this.myVal, newVal, currVal))
}
}

我知道InterLocked.CompareExchange会原子地运作。

但是，行：currVal = this.myVal会读取myVal的最新值吗？

我们不应该为此变量volatile或该行的currVal = InterLocked.Read(ref this.myVal)。 ？