[reactive] Reactive space leak

[Conal Elliott]

Hi Dustin,

Sorry about that. There are some serious space leaks no one has figured out
yet (afaik). :(

    - Conal

On Tue, Jan 11, 2011 at 3:32 PM, Dustin DeWeese <dustin.deweese at gmail.com>wrote:

> I cannot get Reactive to behave.  I am trying to write a simple program
> that feeds events to a function and prints 'DING!' when it receives an event
> from the function.  If the function is id or (join . return), it works
> correctly.  If the function is (>>= return), it consumes all of my RAM and
> does nothing.
>
> Why?  I've spent several days trying to figure this out.
>
> I am using GHC 6.12.1 for x86_64 Linux.
>
> import FRP.Reactive
> import FRP.Reactive.Reactive
> import FRP.Reactive.Internal.Reactive
> import FRP.Reactive.Internal.Timing
> import FRP.Reactive.LegacyAdapters
> import Control.Monad
> import Control.Concurrent
> import Control.Applicative
>
> runEventProcessor :: (Event () -> Event ()) -> IO ()
> runEventProcessor f = do
>   clk <- makeClock
>   (sink, ev) <- makeEvent clk
>   forkE (wait clk) . fmap (\_ -> putStrLn "DING!") . f $ ev
>   forever $ do getLine -- wait for <ENTER>
>                sink ()
>                putStrLn "<< button pressed >>"
>                threadDelay 100000 -- avoid pressing button too fast
>
> wait clk = sleepPast (cGetTime clk) . exactNB
>
> explodes1 = runEventProcessor (>>= return)
> explodes2 = runEventProcessor (join . fmap (Event . pure . pure))
> works1 = runEventProcessor (join . return)
> works2 = runEventProcessor (fmap id)
> works3 = runEventProcessor (join . Event . pure . pure)
> -- requires joinE to be exported from FRP.Reactive.PrimReactive
> -- works4 = runEventProcessor (joinE . return)
>
>
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>
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