C ++ \\ Cli Interlocked :: Add double-如何实现-参考之前的文章

Question

My question is 99% answered in the post referenced below, but I'd like to know how the method is to be called. Since I cannot comment on the solution provided (too low reputation), I was advised to post my comment as a new question.

Original post and answer (by Eugene): Why is there no overload of Interlocked.Add that accepts Doubles as parameters?

Question: trying to program Parallel::For loop which requires an Interlocked::Add on doubles, so the example is great. But how do I call this function?

Say B is to be added to A, both are doubles.

Would the call be A = Add(A, B); ? If not, what should it be?

Answer 1

It'd suggest using the "classic" form of lock-free operation:

• Copy the shared variable to a local variable
• Calculate the operation result
• InterlockedCompareExchange the result, local variable and shared variable. If it fails (meaning the shared variable has changed in the meantime), retry the whole operation.