add getNumCapabilities :: IO Int

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

diff --git a/Data/IORef.hs b/Data/IORef.hs
index 70ea4b1..a6f29e7 100644 (file)
--- a/Data/IORef.hs
+++ b/Data/IORef.hs
@@ -1,4 +1,5 @@
-{-# OPTIONS_GHC -XNoImplicitPrelude #-}
+{-# LANGUAGE CPP, NoImplicitPrelude, MagicHash, UnboxedTuples #-}
+
 -----------------------------------------------------------------------------
 -- |
 -- Module      :  Data.IORef
@@ -35,7 +36,9 @@ import Hugs.IORef
 #ifdef __GLASGOW_HASKELL__
 import GHC.Base
 import GHC.STRef
-import GHC.IOBase
+-- import GHC.IO
+import GHC.IORef hiding (atomicModifyIORef)
+import qualified GHC.IORef
 #if !defined(__PARALLEL_HASKELL__)
 import GHC.Weak
 #endif
@@ -75,7 +78,7 @@ modifyIORef ref f = readIORef ref >>= writeIORef ref . f
 --
 atomicModifyIORef :: IORef a -> (a -> (a,b)) -> IO b
 #if defined(__GLASGOW_HASKELL__)
-atomicModifyIORef (IORef (STRef r#)) f = IO $ \s -> atomicModifyMutVar# r# f s
+atomicModifyIORef = GHC.IORef.atomicModifyIORef
 
 #elif defined(__HUGS__)
 atomicModifyIORef = plainModifyIORef    -- Hugs has no preemption