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Foreign.Marshal.Pool

Portability | portable
Stability | provisional
Maintainer | sven.panne@aedion.de

Contents

Pool management
(Re-)Allocation within a pool
Combined allocation and marshalling

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

data Pool | Source

A memory pool.

newPool :: IO Pool | Source

Allocate a fresh memory pool.

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

pooledMalloc :: Storable a => Pool -> IO (Ptr a) | Source

Allocate space for storable type in the given pool. The size of the area allocated is determined by the `sizeOf` method from the instance of `Storable` for the appropriate type.

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.

pooledNewArray :: Storable a => Pool -> [a] -> IO (Ptr a) | Source

Allocate consecutive storage for a list of values in the given pool and marshal these values into it.

pooledNewArray0 :: Storable a => Pool -> a -> [a] -> IO (Ptr a) | Source

Allocate consecutive storage for a list of values in the given pool and marshal these values into it, terminating the end with the given marker.
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