import Control.Arrow.ArrowZero to help nhc98's type checker

[haskell-directory.git] / Control / Exception.hs

diff --git a/Control/Exception.hs b/Control/Exception.hs
index ee063de..f351f87 100644 (file)
--- a/Control/Exception.hs
+++ b/Control/Exception.hs
@@ -11,6 +11,18 @@
 -- This module provides support for raising and catching both built-in
 -- and user-defined exceptions.
 --
+-- In addition to exceptions thrown by 'IO' operations, exceptions may
+-- be thrown by pure code (imprecise exceptions) or by external events
+-- (asynchronous exceptions), but may only be caught in the 'IO' monad.
+-- For more details, see:
+--
+--  * /A semantics for imprecise exceptions/, by Simon Peyton Jones,
+--    Alastair Reid, Tony Hoare, Simon Marlow, Fergus Henderson,
+--    in /PLDI'99/.
+--
+--  * /Asynchronous exceptions in Haskell/, by Simon Marlow, Simon Peyton
+--    Jones, Andy Moran and John Reppy, in /PLDI'01/.
+--
 -----------------------------------------------------------------------------
 
 module Control.Exception (
@@ -166,11 +178,19 @@ import Data.Dynamic
 -- Also note that the "Prelude" also exports a function called
 -- 'Prelude.catch' with a similar type to 'Control.Exception.catch',
 -- except that the "Prelude" version only catches the IO and user
--- families of exceptions (as required by Haskell 98).  We recommend
--- either hiding the "Prelude" version of
--- 'Prelude.catch' when importing
--- "Control.Exception", or importing
--- "Control.Exception" qualified, to avoid name-clashes.
+-- families of exceptions (as required by Haskell 98).  
+--
+-- We recommend either hiding the "Prelude" version of 'Prelude.catch'
+-- when importing "Control.Exception": 
+--
+-- > import Prelude hiding (catch)
+--
+-- or importing "Control.Exception" qualified, to avoid name-clashes:
+--
+-- > import qualified Control.Exception as C
+--
+-- and then using @C.catch@
+--
 
 catch          :: IO a                 -- ^ The computation to run
        -> (Exception -> IO a)  -- ^ Handler to invoke if an exception is raised
@@ -506,7 +526,8 @@ uncaughtExceptionHandler = unsafePerformIO (newIORef defaultHandler)
           withCString msg $ \cmsg ->
             errorBelch cfmt cmsg
 
-foreign import ccall unsafe errorBelch :: CString -> CString -> IO ()
+foreign import ccall unsafe "RtsMessages.h errorBelch"
+   errorBelch :: CString -> CString -> IO ()
 
 setUncaughtExceptionHandler :: (Exception -> IO ()) -> IO ()
 setUncaughtExceptionHandler = writeIORef uncaughtExceptionHandler