107 lines
4.7 KiB
C++
107 lines
4.7 KiB
C++
// --------------------------------------------------------------------------------
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// MemCache.h
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// Copyright (c)1993-1995 Microsoft Corporation, All Rights Reserved
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// --------------------------------------------------------------------------------
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#ifndef __MEMCACHE_H
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#define __MEMCACHE_H
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// --------------------------------------------------------------------------------
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// Forward Decls
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// --------------------------------------------------------------------------------
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class CMemoryCache;
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typedef CMemoryCache *LPMEMORYCACHE;
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// --------------------------------------------------------------------------------
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// CACHECELLS
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// --------------------------------------------------------------------------------
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#define CACHECELLS 20480
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// --------------------------------------------------------------------------------
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// MEMCACHECELL
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// --------------------------------------------------------------------------------
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typedef struct tagMEMCACHECELL {
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#ifdef DEBUG
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ULONG cFree;
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ULONG cAlloc;
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#endif
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LPVOID pvItemHead; // Pointer to first block
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} MEMCACHECELL, *LPMEMCACHECELL;
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// --------------------------------------------------------------------------------
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// Memory Cache Debug Metrics
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// --------------------------------------------------------------------------------
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#ifdef DEBUG
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typedef struct tagMEMCACHEMETRIC {
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ULONG cAlloc;
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ULONG cAllocCache;
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ULONG cbAlloc;
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ULONG cbAllocCache;
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ULONG cFree;
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ULONG cbFree;
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ULONG cbCacheMax;
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ULONG cFreeFull;
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ULONG cLookAhead;
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ULONG cMostAlloc;
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ULONG cMostFree;
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ULONG cbMostAlloc;
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ULONG cbMostFree;
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} MEMCACHEMETRIC, *LPMEMCACHEMETRIC;
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#define INCMETRIC(_member, _amount) (m_rMetric.##_member += _amount)
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#else // DEBUG
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#define INCMETRIC(_member, _amount) 1 ? (void)0 : (void)
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#endif // DEBUG
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// --------------------------------------------------------------------------------
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// MEMCACHEITEM
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// --------------------------------------------------------------------------------
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typedef struct tagMEMCACHEITEM {
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LPVOID pvItemNext; // Pointer to next block of same size
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} MEMCACHEITEM, *LPMEMCACHEITEM;
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// --------------------------------------------------------------------------------
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// CMemoryCache
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// --------------------------------------------------------------------------------
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class CMemoryCache : public IMalloc
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{
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public:
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// ----------------------------------------------------------------------------
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// Construction
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// ----------------------------------------------------------------------------
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CMemoryCache(IMalloc *pMalloc, ULONG cbMin=0, ULONG cbCacheMax=131072);
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~CMemoryCache(void);
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// ----------------------------------------------------------------------------
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// IUnknown Members
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// ----------------------------------------------------------------------------
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STDMETHODIMP QueryInterface(REFIID riid, LPVOID *ppv) { return TrapError(E_NOTIMPL); }
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STDMETHODIMP_(ULONG) AddRef(void);
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STDMETHODIMP_(ULONG) Release(void);
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// ----------------------------------------------------------------------------
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// CMemoryCache Members
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// ----------------------------------------------------------------------------
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STDMETHODIMP_(LPVOID) Alloc(ULONG cb);
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STDMETHODIMP_(LPVOID) Realloc(LPVOID pv, ULONG cb);
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STDMETHODIMP_(VOID) Free(LPVOID pv);
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STDMETHODIMP_(VOID) HeapMinimize(void);
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STDMETHODIMP_(INT) DidAlloc(LPVOID pv) { return(m_pMalloc->DidAlloc(pv)); }
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STDMETHODIMP_(ULONG) GetSize(LPVOID pv) { return(m_pMalloc->GetSize(pv)); }
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private:
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// ----------------------------------------------------------------------------
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// Private Data
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// ----------------------------------------------------------------------------
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ULONG m_cRef; // Reference Count
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ULONG m_cbMin; // Smallest size buffer to cache
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ULONG m_cbCacheMax; // Maximum size of the cache
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ULONG m_cbCacheCur; // Current Size of the cache
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IMalloc *m_pMalloc; // Memory Allocator
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MEMCACHECELL m_rgCell[CACHECELLS]; // Array of pointers to cell chains
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CRITICAL_SECTION m_cs; // Critical Section
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#ifdef DEBUG
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MEMCACHEMETRIC m_rMetric; // Debug Stats on Cache Usage
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#endif
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};
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#endif // __MEMCACHE_H
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