[project @ 2002-05-09 13:16:29 by simonmar]

[ghc-base.git] / Data / IORef.hs

diff --git a/Data/IORef.hs b/Data/IORef.hs
index f073827..5599685 100644 (file)
--- a/Data/IORef.hs
+++ b/Data/IORef.hs
@@ -1,14 +1,12 @@
 -----------------------------------------------------------------------------
--- 
+-- |
 -- Module      :  Data.IORef
 -- Copyright   :  (c) The University of Glasgow 2001
--- License     :  BSD-style (see the file libraries/core/LICENSE)
+-- License     :  BSD-style (see the file libraries/base/LICENSE)
 -- 
 -- Maintainer  :  libraries@haskell.org
 -- Stability   :  experimental
--- Portability :  non-portable
---
--- $Id: IORef.hs,v 1.1 2001/06/28 14:15:02 simonmar Exp $
+-- Portability :  portable
 --
 -- Mutable references in the IO monad.
 --
@@ -29,7 +27,7 @@ module Data.IORef
 import Prelude
 
 #ifdef __GLASGOW_HASKELL__
-import GHC.Prim                ( mkWeak# )
+import GHC.Base                ( mkWeak# )
 import GHC.STRef
 import GHC.IOBase
 #if !defined(__PARALLEL_HASKELL__)
@@ -37,19 +35,26 @@ import GHC.Weak
 #endif
 #endif /* __GLASGOW_HASKELL__ */
 
-#ifdef __HUGS__
-import IOExts          ( IORef, newIORef, writeIORef, readIORef )
-import ST              ( stToIO, newSTRef, readSTRef, writeSTRef )
-#endif
-
 import Data.Dynamic
 
-#ifndef __PARALLEL_HASKELL__
+#if defined(__GLASGOW_HASKELL__) && !defined(__PARALLEL_HASKELL__)
 mkWeakIORef :: IORef a -> IO () -> IO (Weak (IORef a))
 mkWeakIORef r@(IORef (STRef r#)) f = IO $ \s ->
   case mkWeak# r# r f s of (# s1, w #) -> (# s1, Weak w #)
 #endif
 
+#if defined __HUGS__
+data IORef a        -- mutable variables containing values of type a
+
+primitive newIORef   "newRef" :: a -> IO (IORef a)
+primitive readIORef  "getRef" :: IORef a -> IO a
+primitive writeIORef "setRef" :: IORef a -> a -> IO ()
+primitive eqIORef    "eqRef"  :: IORef a -> IORef a -> Bool
+
+instance Eq (IORef a) where
+    (==) = eqIORef
+#endif /* __HUGS__ */
+
 modifyIORef :: IORef a -> (a -> a) -> IO ()
 modifyIORef ref f = writeIORef ref . f =<< readIORef ref