[reactive] memory leak with justE?

[Conal Elliott]

Hi Sakari,

I've been putting all of my working energy into paper writing (see
http://conal.net/blog) and so haven't had focus for Reactive lately.  The
paper deadline is Monday, so I'll get back to Reactive soon.

  - Conal

On Mon, Feb 23, 2009 at 12:23 PM, Sakari Jokinen <sakariij at gmail.com> wrote:

> Hi,
>
> I have a somewhat larger program using reactive which seems to leak
> memory. I have narrowed at least one possible cause to justE.  If I
> run main_justE  in ghci it eats all the memory while main_filterE
> seems to run fine in constant.
>
> What am I missing here? I'm using ghc 6.10 and reactive 0.10.5.
>
> > module Main where
> > import Control.Monad.Trans(MonadIO, liftIO)
> > import Control.Concurrent
> > import Control.Monad
> > import FRP.Reactive
> > import FRP.Reactive.LegacyAdapters
> > import Data.Monoid(mappend)
> > import Data.Maybe
>
> > main_justE = do
> >  clock <- makeClock
> >  (sink, taskevents) <- makeEvent clock
> >  let go _ = Just $ sink $ Nothing
> >  adaptE $ justE $ fmap go (atTimes [0, 0.1 .. ]) `mappend` taskevents
>
> > instance Show (IO a) where
> >     show _ = "IO"
>
> > main_filterE = do
> >   clock <- makeClock
> >   (sink, taskevents) <- makeEvent clock
> >   let go _ = Just $ sink $ Nothing
> >       justE' = fmap fromJust . filterE (maybe False (const True))
> >   adaptE $ justE' $ fmap go (atTimes [0, 0.1 ..]) `mappend` taskevents
>
>
> Br,
> Sakari
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