Reactor.ReferenceVariables

• Reentrant, protected references: an IORef in an MVar, protected by - a reentrant monitor. - - The operations which change the value (setRef, changeRef, withRef) - are protected by the monitor, which additionally provides a reentrant - synchronize method.

Documentation

data Ref a

Instances

Synchronized (Ref a)

newRef :: a -> IO (Ref a)

setRef :: Ref a -> a -> IO ()

changeRef :: Ref a -> (a -> a) -> IO ()

changeRefM :: Ref a -> (a -> IO a) -> IO ()

withRef :: Ref a -> (a -> b) -> IO b

getRef :: Ref a -> IO a