Split off the concurrent hierarchy (concurrent, unique, timeout)

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

diff --git a/Data/Unique.hs b/Data/Unique.hs
deleted file mode 100644 (file)
index 6f8c24f..0000000
--- a/Data/Unique.hs
+++ /dev/null
@@ -1,59 +0,0 @@
------------------------------------------------------------------------------
--- |
--- Module      :  Data.Unique
--- Copyright   :  (c) The University of Glasgow 2001
--- License     :  BSD-style (see the file libraries/base/LICENSE)
--- 
--- Maintainer  :  libraries@haskell.org
--- Stability   :  experimental
--- Portability :  non-portable
---
--- An abstract interface to a unique symbol generator.
---
------------------------------------------------------------------------------
-
-module Data.Unique (
-   -- * Unique objects
-   Unique,              -- instance (Eq, Ord)
-   newUnique,           -- :: IO Unique
-   hashUnique           -- :: Unique -> Int
- ) where
-
-import Prelude
-
-import Control.Concurrent.MVar
-import System.IO.Unsafe (unsafePerformIO)
-
-#ifdef __GLASGOW_HASKELL__
-import GHC.Base
-import GHC.Num
-#endif
-
--- | An abstract unique object.  Objects of type 'Unique' may be
--- compared for equality and ordering and hashed into 'Int'.
-newtype Unique = Unique Integer deriving (Eq,Ord)
-
-uniqSource :: MVar Integer
-uniqSource = unsafePerformIO (newMVar 0)
-{-# NOINLINE uniqSource #-}
-
--- | Creates a new object of type 'Unique'.  The value returned will
--- not compare equal to any other value of type 'Unique' returned by
--- previous calls to 'newUnique'.  There is no limit on the number of
--- times 'newUnique' may be called.
-newUnique :: IO Unique
-newUnique = do
-   val <- takeMVar uniqSource
-   let next = val+1
-   putMVar uniqSource next
-   return (Unique next)
-
--- | Hashes a 'Unique' into an 'Int'.  Two 'Unique's may hash to the
--- same value, although in practice this is unlikely.  The 'Int'
--- returned makes a good hash key.
-hashUnique :: Unique -> Int
-#if defined(__GLASGOW_HASKELL__)
-hashUnique (Unique i) = I# (hashInteger i)
-#else
-hashUnique (Unique u) = fromInteger (u `mod` (toInteger (maxBound :: Int) + 1))
-#endif