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Foreign.Marshal.Alloc | Portability | portable | Stability | provisional | Maintainer | ffi@haskell.org |
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Description |
Marshalling support: basic routines for memory allocation
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Synopsis |
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Memory allocation
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Local allocation
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alloca f executes the computation f, passing as argument
a pointer to a temporarily allocated block of memory sufficient to
hold values of type a.
The memory is freed when f terminates (either normally or via an
exception), so the pointer passed to f must not be used after this.
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allocaBytes n f executes the computation f, passing as argument
a pointer to a temporarily allocated block of memory of n bytes.
The block of memory is sufficiently aligned for any of the basic
foreign types that fits into a memory block of the allocated size.
The memory is freed when f terminates (either normally or via an
exception), so the pointer passed to f must not be used after this.
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Dynamic allocation
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Allocate a block of memory that is sufficient to hold values of type
a. The size of the area allocated is determined by the sizeOf
method from the instance of Storable for the appropriate type.
The memory may be deallocated using free or finalizerFree when
no longer required.
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Allocate a block of memory of the given number of bytes.
The block of memory is sufficiently aligned for any of the basic
foreign types that fits into a memory block of the allocated size.
The memory may be deallocated using free or finalizerFree when
no longer required.
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Resize a memory area that was allocated with malloc or mallocBytes
to the size needed to store values of type b. The returned pointer
may refer to an entirely different memory area, but will be suitably
aligned to hold values of type b. The contents of the referenced
memory area will be the same as of the original pointer up to the
minimum of the original size and the size of values of type b.
If the argument to realloc is nullPtr, realloc behaves like
malloc.
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Resize a memory area that was allocated with malloc or mallocBytes
to the given size. The returned pointer may refer to an entirely
different memory area, but will be sufficiently aligned for any of the
basic foreign types that fits into a memory block of the given size.
The contents of the referenced memory area will be the same as of
the original pointer up to the minimum of the original size and the
given size.
If the pointer argument to reallocBytes is nullPtr, reallocBytes
behaves like malloc. If the requested size is 0, reallocBytes
behaves like free.
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Free a block of memory that was allocated with malloc,
mallocBytes, realloc, reallocBytes, new
or any of the newX functions in Foreign.Marshal.Array or
Foreign.C.String.
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A pointer to a foreign function equivalent to free, which may be
used as a finalizer (cf ForeignPtr) for storage
allocated with malloc, mallocBytes, realloc or reallocBytes.
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Produced by Haddock version 0.9 |