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Leaked source code of windows server 2003
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windows-server-2003/inetcore/outlookexpress/msoert/memcache.h

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  1. // --------------------------------------------------------------------------------
  2. // MemCache.h
  3. // Copyright (c)1993-1995 Microsoft Corporation, All Rights Reserved
  4. // --------------------------------------------------------------------------------
  5. #ifndef __MEMCACHE_H
  6. #define __MEMCACHE_H
  8. // --------------------------------------------------------------------------------
  9. // Forward Decls
  10. // --------------------------------------------------------------------------------
  11. class CMemoryCache;
  12. typedef CMemoryCache *LPMEMORYCACHE;
  14. // --------------------------------------------------------------------------------
  15. // CACHECELLS
  16. // --------------------------------------------------------------------------------
  17. #define CACHECELLS 20480
  19. // --------------------------------------------------------------------------------
  20. // MEMCACHECELL
  21. // --------------------------------------------------------------------------------
  22. typedef struct tagMEMCACHECELL {
  23. #ifdef DEBUG
  24. ULONG cFree;
  25. ULONG cAlloc;
  26. #endif
  27. LPVOID pvItemHead; // Pointer to first block
  28. } MEMCACHECELL, *LPMEMCACHECELL;
  30. // --------------------------------------------------------------------------------
  31. // Memory Cache Debug Metrics
  32. // --------------------------------------------------------------------------------
  33. #ifdef DEBUG
  34. typedef struct tagMEMCACHEMETRIC {
  35. ULONG cAlloc;
  36. ULONG cAllocCache;
  37. ULONG cbAlloc;
  38. ULONG cbAllocCache;
  39. ULONG cFree;
  40. ULONG cbFree;
  41. ULONG cbCacheMax;
  42. ULONG cFreeFull;
  43. ULONG cLookAhead;
  44. ULONG cMostAlloc;
  45. ULONG cMostFree;
  46. ULONG cbMostAlloc;
  47. ULONG cbMostFree;
  48. } MEMCACHEMETRIC, *LPMEMCACHEMETRIC;
  50. #define INCMETRIC(_member, _amount) (m_rMetric.##_member += _amount)
  51. #else // DEBUG
  52. #define INCMETRIC(_member, _amount) 1 ? (void)0 : (void)
  53. #endif // DEBUG
  55. // --------------------------------------------------------------------------------
  56. // MEMCACHEITEM
  57. // --------------------------------------------------------------------------------
  58. typedef struct tagMEMCACHEITEM {
  59. LPVOID pvItemNext; // Pointer to next block of same size
  60. } MEMCACHEITEM, *LPMEMCACHEITEM;
  62. // --------------------------------------------------------------------------------
  63. // CMemoryCache
  64. // --------------------------------------------------------------------------------
  65. class CMemoryCache : public IMalloc
  66. {
  67. public:
  68. // ----------------------------------------------------------------------------
  69. // Construction
  70. // ----------------------------------------------------------------------------
  71. CMemoryCache(IMalloc *pMalloc, ULONG cbMin=0, ULONG cbCacheMax=131072);
  72. ~CMemoryCache(void);
  74. // ----------------------------------------------------------------------------
  75. // IUnknown Members
  76. // ----------------------------------------------------------------------------
  77. STDMETHODIMP QueryInterface(REFIID riid, LPVOID *ppv) { return TrapError(E_NOTIMPL); }
  78. STDMETHODIMP_(ULONG) AddRef(void);
  79. STDMETHODIMP_(ULONG) Release(void);
  81. // ----------------------------------------------------------------------------
  82. // CMemoryCache Members
  83. // ----------------------------------------------------------------------------
  84. STDMETHODIMP_(LPVOID) Alloc(ULONG cb);
  85. STDMETHODIMP_(LPVOID) Realloc(LPVOID pv, ULONG cb);
  86. STDMETHODIMP_(VOID) Free(LPVOID pv);
  87. STDMETHODIMP_(VOID) HeapMinimize(void);
  88. STDMETHODIMP_(INT) DidAlloc(LPVOID pv) { return(m_pMalloc->DidAlloc(pv)); }
  89. STDMETHODIMP_(ULONG) GetSize(LPVOID pv) { return(m_pMalloc->GetSize(pv)); }
  91. private:
  92. // ----------------------------------------------------------------------------
  93. // Private Data
  94. // ----------------------------------------------------------------------------
  95. ULONG m_cRef; // Reference Count
  96. ULONG m_cbMin; // Smallest size buffer to cache
  97. ULONG m_cbCacheMax; // Maximum size of the cache
  98. ULONG m_cbCacheCur; // Current Size of the cache
  99. IMalloc *m_pMalloc; // Memory Allocator
  100. MEMCACHECELL m_rgCell[CACHECELLS]; // Array of pointers to cell chains
  101. CRITICAL_SECTION m_cs; // Critical Section
  102. #ifdef DEBUG
  103. MEMCACHEMETRIC m_rMetric; // Debug Stats on Cache Usage
  104. #endif
  105. };
  107. #endif // __MEMCACHE_H