Re: [Haskell-cafe] Lazy Lists and IO

On Wed, Jul 11, 2007 at 10:33:06PM +0200, Chaddaï Fouché wrote:

2007/7/11, Andrew Coppin :

...

Ouch! That's gotta sting...

I wasn't aware that this function was so leathal. I use it constantly all the time...

It isn't that "lethal" usually. It's only because he was using it on an infinite stream that it hurt so much... If you use it on a normal stdin or a hGetContents on a file it will be fine (though you will lose the advantage of its laziness, for example constant memory treatment).

It was not infinite. This has nothing to do with infiniteness. This has to do with Lazy lists and IO. Specifically, reading to the end of a list of responses - before sending all the requests. Waiting for the second responce before sending the second request caused a deadlock, even though only a finite number of responces would be received. Stefan