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258 lines
4.2 KiB
258 lines
4.2 KiB
/*++
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Copyright (c) 1992 Microsoft Corporation
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Module Name:
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membmgr.hxx
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Abstract:
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This class offers two classes for the management of fixed
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size blocks of memory. The first class STATIC_MEM_BLOCK_MGR
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allows the user to allocate and free fixed size memory blocks
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up to the specified limit that the class was initialized to.
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The second class MEM_BLOCK_MGR offers a scheme for memory block
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management that will grow as the clients needs increase.
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Author:
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Norbert P. Kusters (norbertk) 29-May-92
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--*/
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#if !defined(_MEM_BLOCK_MGR_DEFN_)
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#define _MEM_BLOCK_MGR_DEFN_
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#include "array.hxx"
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#include "bitvect.hxx"
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DECLARE_CLASS( STATIC_MEM_BLOCK_MGR );
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class STATIC_MEM_BLOCK_MGR : public OBJECT {
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public:
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DECLARE_CONSTRUCTOR( STATIC_MEM_BLOCK_MGR );
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VIRTUAL
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~STATIC_MEM_BLOCK_MGR(
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);
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NONVIRTUAL
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BOOLEAN
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Initialize(
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IN ULONG MemBlockSize,
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IN ULONG NumBlocks DEFAULT 128
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);
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NONVIRTUAL
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PVOID
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Alloc(
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);
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NONVIRTUAL
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BOOLEAN
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Free(
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OUT PVOID MemBlock
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);
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NONVIRTUAL
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ULONG
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QueryBlockSize(
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) CONST;
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NONVIRTUAL
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ULONG
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QueryNumBlocks(
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) CONST;
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private:
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NONVIRTUAL
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VOID
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Construct(
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);
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NONVIRTUAL
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VOID
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Destroy(
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);
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PCHAR _heap;
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ULONG _num_blocks;
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ULONG _block_size;
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ULONG _num_allocated;
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ULONG _next_alloc;
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BITVECTOR _bitvector;
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};
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INLINE
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ULONG
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STATIC_MEM_BLOCK_MGR::QueryBlockSize(
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) CONST
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/*++
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Routine Description:
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This routine return the number of bytes in a block returned
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by this object.
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Arguments:
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None.
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Return Value:
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The number of bytes per block.
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--*/
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{
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return _block_size;
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}
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INLINE
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ULONG
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STATIC_MEM_BLOCK_MGR::QueryNumBlocks(
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) CONST
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/*++
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Routine Description:
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This routine return the number of blocks contained
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by this object.
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Arguments:
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None.
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Return Value:
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The number of blocks.
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--*/
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{
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return _num_blocks;
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}
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DECLARE_CLASS( MEM_BLOCK_MGR );
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class MEM_BLOCK_MGR : public OBJECT {
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public:
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ULIB_EXPORT
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DECLARE_CONSTRUCTOR( MEM_BLOCK_MGR );
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VIRTUAL
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ULIB_EXPORT
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~MEM_BLOCK_MGR(
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);
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NONVIRTUAL
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ULIB_EXPORT
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BOOLEAN
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Initialize(
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IN ULONG MemBlockSize,
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IN ULONG InitialNumBlocks DEFAULT 128
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);
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NONVIRTUAL
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ULIB_EXPORT
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PVOID
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Alloc(
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);
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NONVIRTUAL
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ULIB_EXPORT
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BOOLEAN
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Free(
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OUT PVOID MemBlock
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);
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NONVIRTUAL
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ULONG
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QueryBlockSize(
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) CONST;
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private:
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NONVIRTUAL
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VOID
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Construct(
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);
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NONVIRTUAL
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VOID
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Destroy(
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);
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PSTATIC_MEM_BLOCK_MGR _static_mem_list[32];
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};
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INLINE
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ULONG
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MEM_BLOCK_MGR::QueryBlockSize(
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) CONST
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/*++
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Routine Description:
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This routine return the number of bytes in a block returned
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by this object.
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Arguments:
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None.
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Return Value:
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The number of bytes per block.
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--*/
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{
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return _static_mem_list[0] ? _static_mem_list[0]->QueryBlockSize() : 0;
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}
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INLINE
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PVOID
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operator new(
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IN size_t Size,
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IN PVOID Pointer
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)
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/*++
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Routine Description:
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This is an explicit placement version of the 'new' operator
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which clients of these classes may wish to use in order to
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call the constructor on their newly allocated objects.
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Arguments:
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Size - Supplies the size of the buffer.
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Pointer - Supplies a pointer to the buffer.
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Return Value:
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This function returns the passed in pointer.
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--*/
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{
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return Pointer;
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}
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#endif // _MEM_BLOCK_MGR_DEFN_
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