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Showing content from http://hackage.haskell.org/packages/archive/base/4.5.0.0/doc/html/GHC-Event.html below:

GHC.Event

data EventManager Source

The event manager state.

new :: IO EventManagerSource

Create a new event manager.

getSystemEventManager :: IO (Maybe EventManager)Source

Retrieve the system event manager.

This function always returns Just the system event manager when using the threaded RTS and Nothing otherwise.

loop :: EventManager -> IO ()Source

Start handling events. This function loops until told to stop, using shutdown.

Note: This loop can only be run once per EventManager, as it closes all of its control resources when it finishes.

step :: EventManager -> TimeoutQueue -> IO (Bool, TimeoutQueue)Source

shutdown :: EventManager -> IO ()Source

Asynchronously shuts down the event manager, if running.

data Event Source

An I/O event.

Instances

evtRead :: EventSource

Data is available to be read.

evtWrite :: EventSource

The file descriptor is ready to accept a write.

type IOCallback = FdKey -> Event -> IO ()Source

Callback invoked on I/O events.

data FdKey Source

A file descriptor registration cookie.

Instances

registerFd :: EventManager -> IOCallback -> Fd -> Event -> IO FdKeySource

registerFd mgr cb fd evs registers interest in the events evs on the file descriptor fd. cb is called for each event that occurs. Returns a cookie that can be handed to unregisterFd.

registerFd_ :: EventManager -> IOCallback -> Fd -> Event -> IO (FdKey, Bool)Source

Register interest in the given events, without waking the event manager thread. The Bool return value indicates whether the event manager ought to be woken.

unregisterFd :: EventManager -> FdKey -> IO ()Source

Drop a previous file descriptor registration.

unregisterFd_ :: EventManager -> FdKey -> IO BoolSource

Drop a previous file descriptor registration, without waking the event manager thread. The return value indicates whether the event manager ought to be woken.

closeFd :: EventManager -> (Fd -> IO ()) -> Fd -> IO ()Source

Close a file descriptor in a race-safe way.

type TimeoutCallback = IO ()Source

Callback invoked on timeout events.

data TimeoutKey Source

A timeout registration cookie.

Instances

registerTimeout :: EventManager -> Int -> TimeoutCallback -> IO TimeoutKeySource

Register a timeout in the given number of microseconds. The returned TimeoutKey can be used to later unregister or update the timeout. The timeout is automatically unregistered after the given time has passed.

updateTimeout :: EventManager -> TimeoutKey -> Int -> IO ()Source

Update an active timeout to fire in the given number of microseconds.

unregisterTimeout :: EventManager -> TimeoutKey -> IO ()Source

Unregister an active timeout.

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