C28112/3 的 InterlockedExchange 问题

Question

我遇到了几个代码分析问题：

(774): warning C28113: Accessing a local variable lAbort via an Interlocked function: This is an unusual usage which could be reconsidered.

(775): warning C28112: A variable (lAbort) which is accessed via an Interlocked function must always be accessed via an Interlocked function. See line 774: It is not always safe to access a variable which is accessed via the Interlocked* family of functions in any other way.

来自此代码：

BOOL CHttpDownloader::Abort()
{
  volatile LONG lAbort = 0;
  InterlockedExchange(&lAbort, m_lAbort);
  return (lAbort != 0);
}

我承认这个代码/ class甚至不是我的。原作者暂时不支持，我自己也没用过这些类型的volatile变量

然而，它一直有效，并不清楚修改代码以解决警告的正确方法。

Answer 1

类已被作者修改。该方法现在看起来像这样：

BOOL CHTTPDownloader::Abort()
{
  return (m_lAbort != 0);
}

修改后的类：

http://www.naughter.com/httpdownloaddlg.html