STM.hs

{-# language NoImplicitPrelude #-}
module ST.IO.STM where
import ST.IO
import GHC.Prim

type STM (a :: TYPE r) = IO a
type STM_ = IO_

atomically :: STM a -> IO a
atomically = atomically#

-- | Retry execution of the current memory transaction because it has seen values in TVars which mean that it should not continue (e.g. the TVars represent a shared buffer that is now empty).
-- The implementation may block the thread until one of the TVars that it has read from has been updated.
retry :: STM a
retry = retry#

catch :: STM a -> (e -> STM a) -> STM a
catch = catchSTM#

catch_ :: STM a -> STM a -> STM a
catch_ = catchRetry#