unsafePerformIO
In read your paper ""Tackling the Awkward Squad: monadic input / output, concurrency, exceptions, and foreign-language calls in Haskell", and have a question about unsafePerformIO. In your operational semantic of the IO-Monad you tell nothing about, how 'unsafe' IO actions are performed, is there another paper / documentation about this available, or can you - or someone else - give me a review about that? David JWGU Frankfurt ___ Glasgow-haskell-users mailing list [EMAIL PROTECTED] http://www.haskell.org/mailman/listinfo/glasgow-haskell-users
Re: unsafePerformIO
I'm not sure of a reference, the basic idea is this: IO a is represented by the pair (RealWorld, a) (unboxed, really but whatever) When an IO action is run (via main), a RealWorld state is provided by the compiler and passes it around. When you do unsafePerformIO, the compiler conjures up some value of type RealWorld to use. It is unsafe because it doesn't guarentee the relative order of IO actions. Of course, someone correct me if I'm mistaken. - Hal -- Hal Daume III "Computer science is no more about computers| [EMAIL PROTECTED] than astronomy is about telescopes." -Dijkstra | www.isi.edu/~hdaume On Fri, 20 Sep 2002, David Sabel wrote: > In read your paper ""Tackling the Awkward Squad: monadic input / output, > concurrency, exceptions, and foreign-language calls in Haskell", and have > a question about unsafePerformIO. > > In your operational semantic of the IO-Monad you tell nothing about, how > 'unsafe' IO actions are performed, is there another paper / documentation > about > this available, or can you - or someone else - give me a review about that? > > David > JWGU Frankfurt > > > ___ > Glasgow-haskell-users mailing list > [EMAIL PROTECTED] > http://www.haskell.org/mailman/listinfo/glasgow-haskell-users > ___ Glasgow-haskell-users mailing list [EMAIL PROTECTED] http://www.haskell.org/mailman/listinfo/glasgow-haskell-users
Interface file for ShowFunctions not found
Hello. I am trying to using the ShowFunctions module but ghc 5.04.1 is not being able to find its interface file. A Haskell program to test (t.hs): -- module Main where import ShowFunctions main = print length -- $ ghc -c t.hs t.hs:3: failed to load interface for `ShowFunctions': Could not find interface file for `ShowFunctions' $ find /usr/lib/ghc-5.04.1/ -name "ShowFunctions*" /usr/lib/ghc-5.04.1/imports/lang/ShowFunctions.hi What am I missing? Romildo -- Prof. José Romildo Malaquias Departamento de Computação - Universidade Federal de Ouro Preto http://www.decom.ufop.br/prof/romildo/ [EMAIL PROTECTED] http://uber.com.br/romildo/ [EMAIL PROTECTED] ___ Glasgow-haskell-users mailing list [EMAIL PROTECTED] http://www.haskell.org/mailman/listinfo/glasgow-haskell-users
Re: Interface file for ShowFunctions not found
Hi > I am trying to using the ShowFunctions module but > ghc 5.04.1 is not being able to find its interface > file. > $ ghc -c t.hs Try '-package lang' ___ Glasgow-haskell-users mailing list [EMAIL PROTECTED] http://www.haskell.org/mailman/listinfo/glasgow-haskell-users
