150 lines
2 KiB
C++
150 lines
2 KiB
C++
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/*++
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Copyright (c) 1991 Microsoft Corporation
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Module Name:
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cache.hxx
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Abstract:
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This class models a cache of equal sized blocks.
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Author:
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Norbert Kusters (norbertk) 1-Nov-91
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--*/
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#if !defined(_CACHE_DEFN_)
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#define _CACHE_DEFN_
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#include "bigint.hxx"
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DECLARE_CLASS(CACHE);
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class CACHE : public OBJECT {
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public:
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DECLARE_CONSTRUCTOR( CACHE );
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VIRTUAL
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~CACHE(
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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 BlockSize,
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IN ULONG MaximumNumberOfBlocks
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);
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NONVIRTUAL
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BOOLEAN
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Read(
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IN BIG_INT BlockNumber,
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OUT PVOID Buffer
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) CONST;
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NONVIRTUAL
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VOID
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AddBlock(
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IN BIG_INT BlockNumber,
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IN PCVOID Buffer
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);
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NONVIRTUAL
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VOID
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Empty(
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);
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NONVIRTUAL
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ULONG
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QueryMaxNumBlocks(
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) CONST;
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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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PVOID* _buffer;
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PBIG_INT _block_number;
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PLONG _inuse;
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ULONG _num_blocks;
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ULONG _block_size;
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ULONG _next_add;
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LONG _next_add_inuse;
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LARGE_INTEGER _timeout;
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};
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INLINE
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ULONG
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CACHE::QueryMaxNumBlocks(
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) CONST
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/*++
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Routine Description:
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This routine returns the number of cache blocks used by this object.
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Arguments:
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None.
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Return Value:
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The maximum number of cache blocks.
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--*/
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{
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return _num_blocks;
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}
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INLINE
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ULONG
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CACHE::QueryBlockSize(
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) CONST
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/*++
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Routine Description:
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This routine returns the number of bytes per block.
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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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#endif // _CACHE_DEFN_
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