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Today's Topics:
1. Re: threadDelay does not delay thread execution?
(Ertugrul Soeylemez)
2. Re: Re: threadDelay does not delay thread execution?
(Benjamin Edwards)
3. Re: 'cabal install hdirect' can't find hdirect (Stephen Tetley)
----------------------------------------------------------------------
Message: 1
Date: Mon, 5 Jul 2010 12:34:00 +0200
From: Ertugrul Soeylemez <e...@ertes.de>
Subject: [Haskell-beginners] Re: threadDelay does not delay thread
execution?
To: beginners@haskell.org
Message-ID: <20100705123400.08a5b...@tritium.streitmacht.eu>
Content-Type: text/plain; charset=US-ASCII
Benjamin Edwards <edwards.b...@gmail.com> wrote:
> I am looking to make a simple program that polls an interface once a
> second or so. I thought I could use threadDelay for this, so knocked
> up the following toy program to test my idea.
>
> module TD
> where
>
> import Control.Concurrent
> import Control.Concurrent.MVar
>
> main :: IO ()
> main = do mv <- newEmptyMVar
> forkIO $ loop mv 0 "Hai"
> takeMVar mv
> return ()
> where loop mv n msg = do putStrLn msg
> threadDelay 10000
> if n < 10 then loop mv (n+1) msg
> else putMVar mv ()
>
> It doesn't work, in as much as I see all the messages printed
> seemingly as fast as Std out will print them. What am I doing wrong?
Note that threadDelay takes microseconds, not milliseconds. So
'threadDelay 1000000' should wait one second (at least).
Greets,
Ertugrul
--
nightmare = unsafePerformIO (getWrongWife >>= sex)
http://ertes.de/
------------------------------
Message: 2
Date: Mon, 5 Jul 2010 12:41:03 +0200
From: Benjamin Edwards <edwards.b...@gmail.com>
Subject: Re: [Haskell-beginners] Re: threadDelay does not delay thread
execution?
To: haskellbeginners <beginners@haskell.org>
Message-ID:
<aanlktinnu3ugi91orux8ttijmfjao5afwnboxndam...@mail.gmail.com>
Content-Type: text/plain; charset="iso-8859-1"
ahhhh.... I had read mirco secords, but for some reason in my addled brain I
converted that to miliseconds. Doh!
Thans
On 5 July 2010 12:34, Ertugrul Soeylemez <e...@ertes.de> wrote:
> Benjamin Edwards <edwards.b...@gmail.com> wrote:
>
> > I am looking to make a simple program that polls an interface once a
> > second or so. I thought I could use threadDelay for this, so knocked
> > up the following toy program to test my idea.
> >
> > module TD
> > where
> >
> > import Control.Concurrent
> > import Control.Concurrent.MVar
> >
> > main :: IO ()
> > main = do mv <- newEmptyMVar
> > forkIO $ loop mv 0 "Hai"
> > takeMVar mv
> > return ()
> > where loop mv n msg = do putStrLn msg
> > threadDelay 10000
> > if n < 10 then loop mv (n+1) msg
> > else putMVar mv ()
> >
> > It doesn't work, in as much as I see all the messages printed
> > seemingly as fast as Std out will print them. What am I doing wrong?
>
> Note that threadDelay takes microseconds, not milliseconds. So
> 'threadDelay 1000000' should wait one second (at least).
>
>
> Greets,
> Ertugrul
>
>
> --
> nightmare = unsafePerformIO (getWrongWife >>= sex)
> http://ertes.de/
>
>
> _______________________________________________
> Beginners mailing list
> Beginners@haskell.org
> http://www.haskell.org/mailman/listinfo/beginners
>
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Message: 3
Date: Mon, 5 Jul 2010 14:12:53 +0100
From: Stephen Tetley <stephen.tet...@gmail.com>
Subject: Re: [Haskell-beginners] 'cabal install hdirect' can't find
hdirect
To: Larry Evans <cppljev...@suddenlink.net>
Cc: beginners@haskell.org
Message-ID:
<aanlktil7-6-i-ohnsxrtg_s3osulvk33us_haumo6...@mail.gmail.com>
Content-Type: text/plain; charset="iso-8859-1"
Hi Larry
Here is the working code.
The original paper uses quite a bit of heavy machinery - both
continuation monads (5.6) and the Extensible Union Types (section 4),
so its probably not an ideal starting point for building intuition on
monad transformers or Lambda evaluators.
Lennart Augustsson has some notes "Lambda calculus cooked four ways"
that are good for the later. Off the top of my head, I can't think of
a good source for the former.
-- Code attached for "MonadTransformers and Modular Interpreters"
-- Sheng Liang, Paul Hudak, Mark Jones
--
-- Code written by Wolfram Kahl, 2001-03-27.
--
-- Updated to work with GHC/GHCi, 2010-07-05, by me.
--
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