Sigh, this time with an attachement.. ----- Original Message ----- From: "Sigbjorn Finne" <[EMAIL PROTECTED]> To: "Simon Peyton-Jones" <[EMAIL PROTECTED]> Cc: <[EMAIL PROTECTED]>; <[EMAIL PROTECTED]>; <[EMAIL PROTECTED]> Sent: Monday, June 23, 2003 12:53 Subject: Re: GHCi bug - the impossible happened loading FranTk with ghc-6.0 on Win32
> I tidied up this aspect of TclHaskell / FranTk as part of a Galois > project a while ago. Attached are the as-is changes needed to > avoid being dependent on RTS internals & stop doing a busy wait. > In addition to these diffs, you also want to comment out the defn of > isOnlyProcess in TclCompatibilityGhcSupportsConcurrency.hs > > hth > --sigbjorn > > ----- Original Message ----- > From: "Simon Peyton-Jones" <[EMAIL PROTECTED]> > To: "GHC bugs" <[EMAIL PROTECTED]>; <[EMAIL PROTECTED]> > Cc: "Meurig Sage" <[EMAIL PROTECTED]> > Sent: Monday, June 23, 2003 02:32 > Subject: RE: GHCi bug - the impossible happened loading FranTk with ghc-6.0 > on Win32 > > > > Simon > > > > The underlying problem is that no one is maintaining FranTk at the > > moment. Perhaps you'd like to? > > > > Anyway, FranTk seems to use an un-documented (and therefore unreliable) > > hook into GHC's RTS. When you use GHCi to load systems that link to RTS > > hooks, the dynamic linker's symbol table must be initialised to include > > those symbols. So the 'solution' here is to add 'run_queue_hd' to the > > RTS_SYMBOLS in ghc/rts/Linker.c. You'll need to build GHC from source > > do to this. > > > > Longer term, it'd be a good plan to see just what FranTk wants to know > > here, and what API the RTS should expose to support it. > > > > Admittedly, ghci dies with a rather unhelpful message > > > > Simon > > > > > > | -----Original Message----- > > | From: Meurig Sage [mailto:[EMAIL PROTECTED] > > | Sent: 12 June 2003 16:26 > > | To: Simon Peyton-Jones > > | Cc: Meurig Sage > > | Subject: Re: GHCi bug - the impossible happened loading FranTk with > > ghc-6.0 on Win32 > > | > > | Hi Simon > > | > > ... > > | > > | That being said as far as I remember: > > | FranTk contains the following function which attempts to check whether > > there > > | are any other threads waiting to be scheduled. If there are none then > > it > > | blocks waiting for more user input events, if there are any then it > > simply > > | queries the user input event queue and returns immediately. This makes > > use > > | of a variable run_queue_hd exported by Schedule.h (I think) in the ghc > > | run-time system. When I was working on this in ghc-5.0x ghc compiled > > ghc > > | code provided access to this variable but ghc-i did not. Not sure what > > Simon > > | Marlow has done to this since. > > | > > | Hope this helps > > | > > | The function that does the check is the following one in > > | FranTk/TclHaskellSrc/TclCompatibilityGhcSupportsConcurrency.hs. > > | > > | > > | isOnlyProcess :: IO Bool > > | isOnlyProcess = fmap toBool $ _casm_ ``%r = run_queue_hd == > > END_TSO_QUEUE;'' > > | where > > | toBool :: Int -> Bool > > | toBool 0 = False > > | toBool _ = True > > | > > | Meurig > > | > > | ----- Original Message ----- > > | From: "Simon Peyton-Jones" <[EMAIL PROTECTED]> > > | To: "Meurig Sage" <[EMAIL PROTECTED]> > > | Sent: Thursday, June 12, 2003 2:13 PM > > | Subject: FW: GHCi bug - the impossible happened loading FranTk with > > ghc-6.0 > > | on Win32 > > | > > | > > | Hi Meurig > > | > > | Are you still around? Do you remember what the issue is here? We > > | havn't the foggiest idea > > | > > | Simon > > | > > | -----Original Message----- > > | From: [EMAIL PROTECTED] > > | [mailto:[EMAIL PROTECTED] On Behalf Of Guest, > > | Simon > > | Sent: 12 June 2003 09:12 > > | To: [EMAIL PROTECTED] > > | Subject: GHCi bug - the impossible happened loading FranTk with > > ghc-6.0 > > | on Win32 > > | > > | I can use FranTk with GHC-6.0 on Windows XP just fine in some > > | configurations. > > | It's OK when compiling with GHC. It's also OK with GHCi when using > > | FranTk with no concurrency. > > | > > | However, when trying to load a concurrency enabled FranTk into GHCi, I > > | get "the impossible happened". > > | > > | I tried the workaround for the other GHCi bug, but this apparently > > | different, as shown below. > > | > > | Full disclosure requires me to highlight the following text from the > > | FranTk makefile: > > | > > | # Ununcomment this line to support concurrency. > > | # This support does NOT work with ghci. It does not currently export > > | # the special run_head_queue variable. Will allegedly > > | # be fixed in a future version of ghc. > > | > > | # this version supports concurrency > > | SUPPORTCONCURRENCY = TclCompatibilityGhcSupportsConcurrency.hs > > | > > | Is it simply that this hasn't been fixed yet? (I'm not sure what > > | symptoms are "expected".) > > | I'd very much like to be able to use FranTk with concurrency. Any > > | chance of a fix? > > | > > | cheers, > > | Simon > > | > > | ------------ > > | sjg-pc$ ghci > > | ___ ___ _ > > | / _ \ /\ /\/ __(_) > > | / /_\// /_/ / / | | GHC Interactive, version 6.0, for Haskell > > 98. > > | / /_\\/ __ / /___| | http://www.haskell.org/ghc/ > > | \____/\/ /_/\____/|_| Type :? for help. > > | > > | Loading package base ... linking ... done. > > | Loading package lang ... linking ... done. > > | Loading package text ... linking ... done. > > | Prelude> :t GHC.Err.error > > | GHC.Err.error :: forall a. [Char] -> a > > | Prelude> :set -package FranTk > > | Loading package concurrent ... linking ... done. > > | Loading package haskell98 ... linking ... done. > > | Loading package util ... linking ... done. > > | Loading package data ... linking ... done. > > | Loading package FranTk ... linking ... > > | \\pinkgin\redrum_disk2\sjg\software\I686-~$5\ghc\latest\bin\ghc.exe: > > | panic! (the `impossible' happened, GHC version 6.0): > > | can't load package `FranTk' > > | > > | Please report it as a compiler bug to > > [EMAIL PROTECTED], > > | or http://sourceforge.net/projects/ghc/. > > | > > | -- > > | Registered Office: Roke Manor Research Ltd, Siemens House, Oldbury, > > | Bracknell, > > | Berkshire. RG12 8FZ > > | >
tclh.diff
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