X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=Foreign%2FForeignPtr.hs;h=a240e9dc7c51f760fab17d6a7e5698e218bf18eb;hb=83462100fb0b093e04e0ce8c70ef78e7aef1d00e;hp=94c1591494df0c33d8df6ff201146472f7c38a5e;hpb=d2e40014e751abc0915a84401ec2dccfcc1951b4;p=ghc-base.git

diff --git a/Foreign/ForeignPtr.hs b/Foreign/ForeignPtr.hs
index 94c1591..a240e9d 100644
--- a/Foreign/ForeignPtr.hs
+++ b/Foreign/ForeignPtr.hs
@@ -1,4 +1,4 @@
-{-# OPTIONS -fno-implicit-prelude #-}
+{-# OPTIONS_GHC -XNoImplicitPrelude #-}
 -----------------------------------------------------------------------------
 -- |
 -- Module      :  Foreign.ForeignPtr
@@ -17,23 +17,38 @@
 
 module Foreign.ForeignPtr
         ( 
-	-- * Finalised data pointers
-	  ForeignPtr
-	, FinalizerPtr
+        -- * Finalised data pointers
+          ForeignPtr
+        , FinalizerPtr
+#if defined(__HUGS__) || defined(__GLASGOW_HASKELL__)
+        , FinalizerEnvPtr
+#endif
+        -- ** Basic operations
         , newForeignPtr
         , newForeignPtr_
         , addForeignPtrFinalizer
-	, withForeignPtr
-	, unsafeForeignPtrToPtr
-	, touchForeignPtr
-	, castForeignPtr
-
-	, mallocForeignPtr
-	, mallocForeignPtrBytes
-	, mallocForeignPtrArray
-	, mallocForeignPtrArray0
+#if defined(__HUGS__) || defined(__GLASGOW_HASKELL__)
+        , newForeignPtrEnv
+        , addForeignPtrFinalizerEnv
+#endif
+        , withForeignPtr
+
+#ifdef __GLASGOW_HASKELL__
+        , finalizeForeignPtr
+#endif
+
+        -- ** Low-level operations
+        , unsafeForeignPtrToPtr
+        , touchForeignPtr
+        , castForeignPtr
+
+        -- ** Allocating managed memory
+        , mallocForeignPtr
+        , mallocForeignPtrBytes
+        , mallocForeignPtrArray
+        , mallocForeignPtrArray0
         ) 
-	where
+        where
 
 import Foreign.Ptr
 
@@ -42,6 +57,7 @@ import NHC.FFI
   ( ForeignPtr
   , FinalizerPtr
   , newForeignPtr
+  , newForeignPtr_
   , addForeignPtrFinalizer
   , withForeignPtr
   , unsafeForeignPtrToPtr
@@ -57,23 +73,19 @@ import Hugs.ForeignPtr
 #endif
 
 #ifndef __NHC__
-import Foreign.Storable	( Storable(sizeOf) )
+import Foreign.Storable ( Storable(sizeOf) )
 #endif
 
 #ifdef __GLASGOW_HASKELL__
 import GHC.Base
 import GHC.IOBase
 import GHC.Num
-import GHC.Err		( undefined )
+import GHC.Err          ( undefined )
 import GHC.ForeignPtr
 #endif
 
 #if !defined(__NHC__) && !defined(__GLASGOW_HASKELL__)
-import Foreign.Marshal.Alloc	( malloc, mallocBytes, finalizerFree )
-import Data.Dynamic
-
-#include "Dynamic.h"
-INSTANCE_TYPEABLE1(ForeignPtr,foreignPtrTc,"ForeignPtr")
+import Foreign.Marshal.Alloc    ( malloc, mallocBytes, finalizerFree )
 
 instance Eq (ForeignPtr a) where 
     p == q  =  unsafeForeignPtrToPtr p == unsafeForeignPtrToPtr q
@@ -87,6 +99,20 @@ 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).
+newForeignPtr finalizer p
+  = do fObj <- newForeignPtr_ p
+       addForeignPtrFinalizer finalizer fObj
+       return fObj
+
 withForeignPtr :: ForeignPtr a -> (Ptr a -> IO b) -> IO b
 -- ^This is a way to look at the pointer living inside a
 -- foreign object.  This function takes a function which is
@@ -97,7 +123,7 @@ withForeignPtr :: ForeignPtr a -> (Ptr a -> IO b) -> IO b
 -- the action and use it after the action completes. All uses
 -- of the pointer should be inside the
 -- 'withForeignPtr' bracket.  The reason for
--- this unsafety is the same as for
+-- this unsafeness is the same as for
 -- 'unsafeForeignPtrToPtr' below: the finalizer
 -- may run earlier than expected, because the compiler can only
 -- track usage of the 'ForeignPtr' object, not
@@ -113,28 +139,62 @@ withForeignPtr fo io
        return r
 #endif /* ! __NHC__ */
 
-#ifdef __HUGS__
--- temporary aliasing until hugs catches up
-unsafeForeignPtrToPtr = foreignPtrToPtr
+#if defined(__HUGS__) || defined(__GLASGOW_HASKELL__)
+-- | This variant of 'newForeignPtr' adds a finalizer that expects an
+-- environment in addition to the finalized pointer.  The environment
+-- that will be passed to the finalizer is fixed by the second argument to
+-- 'newForeignPtrEnv'.
+newForeignPtrEnv ::
+    FinalizerEnvPtr env a -> Ptr env -> Ptr a -> IO (ForeignPtr a)
+newForeignPtrEnv finalizer env p
+  = do fObj <- newForeignPtr_ p
+       addForeignPtrFinalizerEnv finalizer env fObj
+       return fObj
+#endif /* __HUGS__ */
+
+#ifdef __GLASGOW_HASKELL__
+type FinalizerEnvPtr env a = FunPtr (Ptr env -> Ptr a -> IO ())
+
+-- | like 'addForeignPtrFinalizerEnv' but allows the finalizer to be
+-- passed an additional environment parameter to be passed to the
+-- finalizer.  The environment passed to the finalizer is fixed by the
+-- second argument to 'addForeignPtrFinalizerEnv'
+addForeignPtrFinalizerEnv ::
+  FinalizerEnvPtr env a -> Ptr env -> ForeignPtr a -> IO ()
+addForeignPtrFinalizerEnv finalizer env fptr = 
+  addForeignPtrConcFinalizer fptr 
+        (mkFinalizerEnv finalizer env (unsafeForeignPtrToPtr fptr))
+
+foreign import ccall "dynamic" 
+  mkFinalizerEnv :: FinalizerEnvPtr env a -> Ptr env -> Ptr a -> IO ()
 #endif
 
+
 #ifndef __GLASGOW_HASKELL__
 mallocForeignPtr :: Storable a => IO (ForeignPtr a)
 mallocForeignPtr = do
   r <- malloc
-  newForeignPtr r finalizerFree
+  newForeignPtr finalizerFree r
 
 mallocForeignPtrBytes :: Int -> IO (ForeignPtr a)
 mallocForeignPtrBytes n = do
   r <- mallocBytes n
-  newForeignPtr r finalizerFree
-#endif /* __HUGS__ || __NHC__ */
+  newForeignPtr finalizerFree r
+#endif /* !__GLASGOW_HASKELL__ */
 
+-- | This function is similar to 'Foreign.Marshal.Array.mallocArray',
+-- but yields a memory area that has a finalizer attached that releases
+-- the memory area.  As with 'mallocForeignPtr', it is not guaranteed that
+-- the block of memory was allocated by 'Foreign.Marshal.Alloc.malloc'.
 mallocForeignPtrArray :: Storable a => Int -> IO (ForeignPtr a)
 mallocForeignPtrArray  = doMalloc undefined
   where
-    doMalloc            :: Storable a => a -> Int -> IO (ForeignPtr a)
+    doMalloc            :: Storable b => b -> Int -> IO (ForeignPtr b)
     doMalloc dummy size  = mallocForeignPtrBytes (size * sizeOf dummy)
 
+-- | This function is similar to 'Foreign.Marshal.Array.mallocArray0',
+-- but yields a memory area that has a finalizer attached that releases
+-- the memory area.  As with 'mallocForeignPtr', it is not guaranteed that
+-- the block of memory was allocated by 'Foreign.Marshal.Alloc.malloc'.
 mallocForeignPtrArray0      :: Storable a => Int -> IO (ForeignPtr a)
 mallocForeignPtrArray0 size  = mallocForeignPtrArray (size + 1)