Re: [Haskell-cafe] multi-thread and lazy evaluation

On Mon, Dec 24, 2012 at 8:45 AM, Corentin Dupont wrote:

*execBlocking :: MVar (Maybe MyData) -> IO () execBlocking mv = do let (a::String) = a --If you uncomment the next line, it will work --putStrLn $ show a putMVar mv (Just $ MyData a "toto")*

It's laziness, yes; you need to do something along the lines of

let a = length a `seq` a

or possibly Control.Exception.evaluate needs to be involved somewhere. -- brandon s allbery kf8nh sine nomine associates allbery.b@gmail.com ballbery@sinenomine.net unix, openafs, kerberos, infrastructure, xmonad http://sinenomine.net