Util.Thread

Basic Thread operations.

Documentation

data ThreadId

A ThreadId is an abstract type representing a handle to a thread. ThreadId is an instance of Eq, Ord and Show, where the Ord instance implements an arbitrary total ordering over ThreadIds. The Show instance lets you convert an arbitrary-valued ThreadId to string form; showing a ThreadId value is occasionally useful when debugging or diagnosing the behaviour of a concurrent program.

Note: in GHC, if you have a ThreadId, you essentially have a pointer to the thread itself. This means the thread itself can't be garbage collected until you drop the ThreadId. This misfeature will hopefully be corrected at a later date.

Note: Hugs does not provide any operations on other threads; it defines ThreadId as a synonym for ().

Instances

Eq ThreadId

Ord ThreadId

Show ThreadId

Typeable ThreadId

forkIODebug :: IO () -> IO ThreadId

forkIOquiet :: String -> IO () -> IO ThreadId

goesQuietly :: IO () -> IO ()

type Duration = Int

mins :: Double -> Duration

secs :: Double -> Duration

msecs :: Double -> Duration

usecs :: Double -> Duration

delay :: Duration -> IO ()

after :: Duration -> IO a -> IO a

every :: Duration -> IO a -> IO ()

mapMConcurrent :: (a -> IO b) -> [a] -> IO [b]

mapMConcurrent_ :: (a -> IO ()) -> [a] -> IO ()

mapMConcurrentExcep :: forall a b. (a -> IO b) -> [a] -> IO [b]