finalizers on handles

[Brandon S. Allbery KF8NH]

On Jun 23, 2009, at 09:41 , Simon Marlow wrote:
>> main = do
>> (ih, oh, _, _) <- runInteractiveProcess "cat" [] Nothing Nothing
>> comphszp <- hGetContents oh
>> print (length comphszp)
>> -- hClose ih -- with this line they both deadlock


Note that you can trigger this in any language; it's a classic  
beginner error with pipes (see, for example, the documentation for  
open2/open3 in Perl or Python for other examples).  Detecting this in  
the type system would be an interesting idea, but de facto I think  
this is a "it hurts when I do this".

-- 
brandon s. allbery [solaris,freebsd,perl,pugs,haskell] allbery at kf8nh.com
system administrator [openafs,heimdal,too many hats] allbery at ece.cmu.edu
electrical and computer engineering, carnegie mellon university    KF8NH


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