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|
-----------------------------------------------------------------------------
-- IO monad extensions:
--
-- Suitable for use with Hugs 98.
-----------------------------------------------------------------------------
module IOExts
( fixIO
, unsafePerformIO
, unsafeInterleaveIO
, IORef
-- instance Eq (IORef a)
, newIORef
, readIORef
, writeIORef
, IOArray
-- instance Eq (IOArray ix elt)
, newIOArray
, boundsIOArray
, readIOArray
, writeIOArray
, thawIOArray
, freezeIOArray
, unsafeFreezeIOArray
, performGC
, trace
, unsafePtrEq
, unsafePtrToInt
) where
import Trace( trace )
import IO( ioeGetErrorString )
import Array
-----------------------------------------------------------------------------
primitive performGC "primGC" :: IO ()
unsafePerformIO :: IO a -> a
unsafePerformIO m = performIO (runAndShowError m)
unsafeInterleaveIO :: IO a -> IO a
unsafeInterleaveIO m = interleaveIO (runAndShowError m)
primitive unsafePtrEq :: a -> a -> Bool
primitive unsafePtrToInt :: a -> Int
fixIO :: (a -> IO a) -> IO a
fixIO m = IO fixIO'
where
fixIO' fail succ =
case r of
Finished_Return a -> succ a
Finished_Error err -> fail err
other -> error "IOExts:fixIO: failed"
where
r = basicIORun (m a)
a = case r of
Finished_Return a -> a
_ -> error "IOExts:fixIO: thread exited with error"
primitive unsafeCoerce "primUnsafeCoerce" :: a -> b
performIO :: IO a -> a
performIO m =
case basicIORun m of
Finished_Return a -> a
_ -> error "IOExts.performIO: thread exited with error"
interleaveIO :: IO a -> IO a
interleaveIO m = IO (\ f s ->
s (case basicIORun m of
Finished_Return a -> a
_ -> error "IOExts.interleaveIO: thread exited with error"
))
runAndShowError :: IO a -> IO a
runAndShowError m =
m `catch` \err -> do
putChar '\n'
putStr (ioeGetErrorString err)
return undefined
-----------------------------------------------------------------------------
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
-----------------------------------------------------------------------------
data IOArray ix elt -- implemented as an internal primitive
newIOArray :: Ix ix => (ix,ix) -> elt -> IO (IOArray ix elt)
boundsIOArray :: Ix ix => IOArray ix elt -> (ix, ix)
readIOArray :: Ix ix => IOArray ix elt -> ix -> IO elt
writeIOArray :: Ix ix => IOArray ix elt -> ix -> elt -> IO ()
thawIOArray :: Ix ix => Array ix elt -> IO (IOArray ix elt)
freezeIOArray :: Ix ix => IOArray ix elt -> IO (Array ix elt)
unsafeFreezeIOArray :: Ix ix => IOArray ix elt -> IO (Array ix elt)
newIOArray bs e = primNewArr bs (rangeSize bs) e
boundsIOArray a = primBounds a
readIOArray a i = primReadArr index a i
writeIOArray a i e = primWriteArr index a i e
thawIOArray arr = do a <- newIOArray (bounds arr) err
let fillin [] = return a
fillin((ix,v):ixs) = do writeIOArray a ix v
fillin ixs
fillin (assocs arr)
where err = error "thawArray: element not overwritten"
freezeIOArray a = primFreeze a
unsafeFreezeIOArray = freezeIOArray -- not as fast as GHC
instance Eq (IOArray ix elt) where
(==) = eqIOArray
primitive primNewArr "IONewArr"
:: (a,a) -> Int -> b -> IO (IOArray a b)
primitive primReadArr "IOReadArr"
:: ((a,a) -> a -> Int) -> IOArray a b -> a -> IO b
primitive primWriteArr "IOWriteArr"
:: ((a,a) -> a -> Int) -> IOArray a b -> a -> b -> IO ()
primitive primFreeze "IOFreeze"
:: IOArray a b -> IO (Array a b)
primitive primBounds "IOBounds"
:: IOArray a b -> (a,a)
primitive eqIOArray "IOArrEq"
:: IOArray a b -> IOArray a b -> Bool
-----------------------------------------------------------------------------
|
