reactive-0.8.6: Simple foundation for functional reactive programming Source code Contents Index

FRP.Reactive.Internal.IVar Stability experimental Maintainer conal@conal.net

Description

Write-once variables.

Synopsis

data IVar a newEmptyIVar :: IO (IVar a) readIVar :: IVar a -> a tryReadIVar :: IVar a -> IO (Maybe a) writeIVar :: IVar a -> a -> IO ()

Documentation

data IVar a Source

newEmptyIVar :: IO (IVar a) Source

readIVar :: IVar a -> a Source

Returns the value in the IVar. The *value* will block until the variable becomes filled.

tryReadIVar :: IVar a -> IO (Maybe a) Source

Returns Nothing if the IVar has no value yet, otherwise returns the value.

writeIVar :: IVar a -> a -> IO () Source

Puts the value of the IVar. If it already has a value, block forever.

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