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
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