> Thanks for the tip, although it seems tricky to get it right. I wonder
> why there is no strict version of atomicModifyIORef?
> Dually there might be a strict version of IORef datatype.
Alternatively, you could use STM, where you can write your own atomic
update function, which has the strictness you need (untested):
import Control.Concurrent.STM
strictUpdate :: (a->a) -> TVar a -> STM ()
strictUpdate f v = do
x <- readTVar v
let x1 = f x
x1 `seq` writeTVar v x1
g :: (Int->Int) -> TVar Int -> IO ()
g f v = atomically (strictUpdate f v)
Tim
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