final revision to GArrow classes

[ghc-base.git] / Foreign / ForeignPtr.hs

diff --git a/Foreign/ForeignPtr.hs b/Foreign/ForeignPtr.hs
index 59fcf82..b91ffeb 100644 (file)
--- a/Foreign/ForeignPtr.hs
+++ b/Foreign/ForeignPtr.hs
@@ -1,4 +1,5 @@
-{-# OPTIONS_GHC -XNoImplicitPrelude #-}
+{-# LANGUAGE CPP, NoImplicitPrelude #-}
+
 -----------------------------------------------------------------------------
 -- |
 -- Module      :  Foreign.ForeignPtr
@@ -78,7 +79,7 @@ import Foreign.Storable ( Storable(sizeOf) )
 
 #ifdef __GLASGOW_HASKELL__
 import GHC.Base
-import GHC.IOBase
+-- import GHC.IO
 import GHC.Num
 import GHC.Err          ( undefined )
 import GHC.ForeignPtr
@@ -101,13 +102,10 @@ instance Show (ForeignPtr a) where
 #ifndef __NHC__
 newForeignPtr :: FinalizerPtr a -> Ptr a -> IO (ForeignPtr a)
 -- ^Turns a plain memory reference into a foreign pointer, and
--- associates a finaliser with the reference.  The finaliser will be executed
--- after the last reference to the foreign object is dropped.  Note that there
--- is no guarantee on how soon the finaliser is executed after the last
--- reference was dropped; this depends on the details of the Haskell storage
--- manager.  Indeed, there is no guarantee that the finalizer is executed at
--- all; a program may exit with finalizers outstanding.  (This is true
--- of GHC, other implementations may give stronger guarantees).
+-- associates a finalizer with the reference.  The finalizer will be
+-- executed after the last reference to the foreign object is dropped.
+-- There is no guarantee of promptness, however the finalizer will be
+-- executed before the program exits.
 newForeignPtr finalizer p
   = do fObj <- newForeignPtr_ p
        addForeignPtrFinalizer finalizer fObj