fork package:slave-thread

fork :: IO a -> IO ThreadId
slave-thread SlaveThread
Fork a slave thread to run a computation on.
forkFinally :: IO a -> IO b -> IO ThreadId
slave-thread SlaveThread
Fork a slave thread with a finalizer action to run a computation on. The finalizer gets executed when the thread dies for whatever reason: due to being killed or an uncaught exception, or a normal termination. Note the order of arguments: 
forkFinally finalizer computation
forkFinallyWithUnmask :: IO a -> ((forall x . IO x -> IO x) -> IO b) -> IO ThreadId
slave-thread SlaveThread
Like forkFinally, but provides the computation a function that unmasks asynchronous exceptions. See Note [Unmask] at the bottom of this module.
forkWithUnmask :: ((forall x . IO x -> IO x) -> IO a) -> IO ThreadId
slave-thread SlaveThread
Like fork, but provides the computation a function that unmasks asynchronous exceptions. See Note [Unmask] at the bottom of this module.