24 Jun
2009
24 Jun
'09
4:52 a.m.
On Tue, 23 Jun 2009, Brandon S. Allbery KF8NH wrote:
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".
Sure - but it hurts more when in some environments you get away with it and others you don't. Ganesh