| Copyright | (c) Sven Panne 2002-2004 |
|---|---|
| License | BSD-style (see the file libraries/base/LICENSE) |
| Maintainer | [email protected] |
| Stability | provisional |
| Portability | portable |
| Safe Haskell | Trustworthy |
| Language | Haskell2010 |
Foreign.Marshal.Pool
Description
This module contains support for pooled memory management. Under this scheme,
(re-)allocations belong to a given pool, and everything in a pool is
deallocated when the pool itself is deallocated. This is useful when
alloca with its implicit allocation and deallocation
is not flexible enough, but explicit uses of malloc
and free are too awkward.
Synopsis
- data Pool
- newPool :: IO Pool
- freePool :: Pool -> IO ()
- withPool :: (Pool -> IO b) -> IO b
- pooledMalloc :: Storable a => Pool -> IO (Ptr a)
- pooledMallocBytes :: Pool -> Int -> IO (Ptr a)
- pooledRealloc :: Storable a => Pool -> Ptr a -> IO (Ptr a)
- pooledReallocBytes :: Pool -> Ptr a -> Int -> IO (Ptr a)
- pooledMallocArray :: Storable a => Pool -> Int -> IO (Ptr a)
- pooledMallocArray0 :: Storable a => Pool -> Int -> IO (Ptr a)
- pooledReallocArray :: Storable a => Pool -> Ptr a -> Int -> IO (Ptr a)
- pooledReallocArray0 :: Storable a => Pool -> Ptr a -> Int -> IO (Ptr a)
- pooledNew :: Storable a => Pool -> a -> IO (Ptr a)
- pooledNewArray :: Storable a => Pool -> [a] -> IO (Ptr a)
- pooledNewArray0 :: Storable a => Pool -> a -> [a] -> IO (Ptr a)
Pool management
freePool :: Pool -> IO () Source #
Deallocate a memory pool and everything which has been allocated in the pool itself.
withPool :: (Pool -> IO b) -> IO b Source #
Execute an action with a fresh memory pool, which gets automatically deallocated (including its contents) after the action has finished.
(Re-)Allocation within a pool
pooledMallocBytes :: Pool -> Int -> IO (Ptr a) Source #
Allocate the given number of bytes of storage in the pool.
pooledRealloc :: Storable a => Pool -> Ptr a -> IO (Ptr a) Source #
Adjust the storage area for an element in the pool to the given size of the required type.
pooledReallocBytes :: Pool -> Ptr a -> Int -> IO (Ptr a) Source #
Adjust the storage area for an element in the pool to the given size.
pooledMallocArray :: Storable a => Pool -> Int -> IO (Ptr a) Source #
Allocate storage for the given number of elements of a storable type in the pool.
pooledMallocArray0 :: Storable a => Pool -> Int -> IO (Ptr a) Source #
Allocate storage for the given number of elements of a storable type in the pool, but leave room for an extra element to signal the end of the array.
pooledReallocArray :: Storable a => Pool -> Ptr a -> Int -> IO (Ptr a) Source #
Adjust the size of an array in the given pool.
pooledReallocArray0 :: Storable a => Pool -> Ptr a -> Int -> IO (Ptr a) Source #
Adjust the size of an array with an end marker in the given pool.
Combined allocation and marshalling
pooledNew :: Storable a => Pool -> a -> IO (Ptr a) Source #
Allocate storage for a value in the given pool and marshal the value into this storage.