System.Posix.AtomicOps

types

data FPRef a

A reference to a value held in a Foreign Ptr

basic interface

newFPRef :: Storable a => a -> IO (FPRef a)

readFPRef :: Storable a => FPRef a -> IO a

writeFPRef :: Storable a => FPRef a -> a -> IO ()

FPRef Int operations

fetchAddFPRef :: FPRef Int -> Int -> IO Int

fetch the previous value in an FPRef, and increment the FPRef by the given amount. This operation is atomic.

addFetchFPRef :: FPRef Int -> Int -> IO Int

increment the FPRef by the given amount and return the new value. This operation is atomic.