Yes, you're absolutely right about the name. My proposal is thus amended. On Sun, Jun 24, 2018, 7:38 PM Dr.Koster <drkoster@qq.com> wrote:
+1, BTW. let's call it atomicSwapIORef to keep sync with MVar/TVar's counterpart.
发自我的iPhone
------------------ Original ------------------ *From:* David Feuer <david.feuer@gmail.com> *Date:* Sat,Jun 23,2018 4:15 PM *To:* Haskell Libraries <libraries@haskell.org> *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