Control.Concurrent.STM.DTVar

TVars with a dirty bit that allows for one listener

Documentation

data DTVar a

TVars with a dirty bit which allows for one listener.

newDTVar :: a -> STM (DTVar a)

New DTVar which starts dirty

newDTVarIO :: a -> IO (DTVar a)

newDTVar in IO

writeDTVar :: DTVar a -> a -> STM ()

Write a value to a DTVar, making it dirty

writeDTVarIO :: DTVar a -> a -> IO ()

writeDTVar in IO

readDTVar :: DTVar a -> STM a

Reads a DTVar without changing the dirty bit

readDTVarIO :: DTVar a -> IO a

readDTVar in IO

listenDTVar :: DTVar a -> STM a

Listens until the dirty bit is true, then removes the dirty bit and returns the read element

listenDTVarIO :: DTVar a -> IO a

listenDTVar in IO

listenDTVars :: [DTVar a] -> STM [a]

Listen until any of the dirty bits are true, then removes all dirty bits and returns all DTVar's values, in order.

listenDTVarsIO :: [DTVar a] -> IO [a]

listenDTVars in IO

modifyDTVar :: DTVar a -> (a -> a) -> STM ()

Modify a DTVar, making it dirty.