[reactive] Curious crash
conal at conal.net
Wed Nov 12 18:38:33 EST 2008
Looks like you're getting close to at least one bug. Thanks very much.
Would you do me a favor and make a trac ticket, to make sure it doesn't slip
through the cracks of my memory? The trac URL is
If you or anyone has a suggestion or bug report to offer and doesn't want to
make a trac ticket, please let me know, and I'll do it. Better yet, let me
know if there's anything I can do to make it more convenient to use trac.
Regards, - Conal
2008/11/12 Creighton Hogg <wchogg at gmail.com>
> So below is something I discovered that seems very strange.
> If you run the following code as is, it will run & you'll get stuck in the
> already documented integral loop.
> If you replace the use of events in main with events', the program consumes
> all available memory & locks up hard.
> I know I'm horribly abusing Reactive here, but I don't see why it should
> fail _so_ ungracefully.
> import FRP.Reactive
> import FRP.Reactive.LegacyAdapters
> import Control.Concurrent
> import Control.Monad
> x :: Event () -> Behavior Double
> x e = b where b = integral e b
> events :: Event ()
> events = atTimes [0.1,0.2]
> events' :: Event ()
> events' = once events
> schedule a = threadDelay 100000 >> a
> main = do
> c <- makeClock
> u <- mkUpdater (cGetTime c) (fmap print $ x events)
> forever $ schedule u
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