Re: Proposal: Add an atomic IORef replacement operation

Yes, you're absolutely right about the name. My proposal is thus amended. On Sun, Jun 24, 2018, 7:38 PM Dr.Koster wrote:

+1, BTW. let's call it atomicSwapIORef to keep sync with MVar/TVar's counterpart.

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------------------ Original ------------------ *From:* David Feuer *Date:* Sat,Jun 23,2018 4:15 PM *To:* Haskell Libraries *Subject:* Re: Proposal: Add an atomic IORef replacement operation

Currently, atomicWriteIORef is implemented using atomicModifyIORef. This is not ideal: the latter allocates memory while the former shouldn't need to. In the process of writing alternative implementations, I realized that we can efficiently support an atomic operation that replaces the value in an IORef, returning the previous value. I propose that we add, to Data.IORef, a function to do so:

atomicReplaceIORef :: IORef a -> a -> IO a