_ak_dyna_blk_pool_8h

Wwise SDK 2022.1.12

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 released in source code form as part of the SDK installer package.
  
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 may use this file in accordance with the end user license agreement provided 
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 "Apache License"); you may not use this file except in compliance with the 
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 #ifndef _AKBLOCKPOOL_H
 #define _AKBLOCKPOOL_H
  
 #include <AK/Tools/Common/AkObject.h>
 #include <AK/Tools/Common/AkAssert.h>
 #include <AK/Tools/Common/AkListBareLight.h>
  
 //
 //  AkDynaBlkPool   - A dynamic block pool allocator which will grow (and shrink) in size in contiguous chunks of 'uPoolChunkSize' objects.
 //                  - Fragmentation in the pool will prevent it from shrinking, but in many use cases this is acceptable.
 //
  
 #ifdef _DEBUG
 //#define AK_DYNA_BLK_STATS
 #define AK_DYNA_BLK_SCRUB_MEM
 #endif
  
 #ifdef AK_DYNA_BLK_STATS
 #define STATS_ALLOC() Stats_Alloc()
 #define STATS_NEWCHUNK() Stats_NewChunk()
 #define STATS_FREE() Stats_Free()
 #define STATS_DELCHUNK() Stats_DelChunk()
 #else
 #define STATS_ALLOC()
 #define STATS_NEWCHUNK()
 #define STATS_FREE()
 #define STATS_DELCHUNK()
 #endif
  
 #ifdef AK_DYNA_BLK_SCRUB_MEM
 #define SCRUB_NEW_CHUNK() memset(&memory, 0xCC, sizeof(T)*uPoolChunkSize)
 #define SCRUB_NEW_ALLOC(pItem) memset(pItem, 0xAA, sizeof(T))
 #define SCRUB_FREE_BLOCK(pObj) memset(pObj, 0xDD, sizeof(T))
 #else
 #define SCRUB_NEW_CHUNK()
 #define SCRUB_NEW_ALLOC(pItem)
 #define SCRUB_FREE_BLOCK(pObj)
 #endif
  
 template  < typename T, AkUInt32 uPoolChunkSize, class TAlloc = ArrayPoolDefault>
 class AkDynaBlkPool: public TAlloc
 {
     enum { kChunkMemoryBytes = sizeof(T)*uPoolChunkSize };
  
     struct FreeBlock
     {
         FreeBlock* pNextItem;
         char padding[ sizeof(T) - sizeof(FreeBlock*) ];
     };
     typedef AkListBare< FreeBlock, AkListBareNextItem, AkCountPolicyWithCount, AkLastPolicyNoLast > tFreeList;
  
     struct PoolChunk
     {
         PoolChunk() : pNextLightItem(NULL)
         {
             SCRUB_NEW_CHUNK();
             for( AkUInt32 i=0; i<uPoolChunkSize; ++i )
             {
                 FreeBlock* pBlk = reinterpret_cast<FreeBlock*>( &memory ) + i;
                 freeList.AddFirst(pBlk);
             }
         }
  
         inline bool BelongsTo( FreeBlock* pMem ) const { return (AkUInt8*)pMem >= memory && (AkUInt8*)pMem < (memory+kChunkMemoryBytes); }
         inline bool AllFree() const { return freeList.Length() == uPoolChunkSize; }
         inline bool AllAllocd() const { return freeList.IsEmpty();  }
  
         AkUInt8 memory[ kChunkMemoryBytes ];
         PoolChunk* pNextLightItem;
         tFreeList freeList;
     };
     typedef AkListBareLight< PoolChunk > tChunkList;
  
 public:
  
     T* New()
     {
         T* ptr = Alloc();
         if (ptr) AkPlacementNew(ptr) T;
         return ptr;
     }
  
     template<typename A1>
     T* New(A1 a1)
     {
         T* ptr = Alloc();
         if (ptr) AkPlacementNew(ptr) T(a1);
         return ptr;
     }
  
     template<typename A1, typename A2>
     T* New(A1 a1, A2 a2)
     {
         T* ptr = Alloc();
         if (ptr) AkPlacementNew(ptr) T(a1, a2);
         return ptr;
     }
  
     template<typename A1, typename A2, typename A3>
     T* New(A1 a1, A2 a2, A3 a3)
     {
         T* ptr = Alloc();
         if (ptr) AkPlacementNew(ptr) T(a1, a2, a3);
         return ptr;
     }
  
     template<typename A1, typename A2, typename A3, typename A4>
     T* New(A1 a1, A2 a2, A3 a3, A4 a4)
     {
         T* ptr = Alloc();
         if (ptr) AkPlacementNew(ptr) T(a1,a2,a3,a4);
         return ptr;
     }
  
     void Delete(T* ptr)
     {
         ptr->~T();
         Free(ptr);
     }
  
 private:
     T* Alloc()
     {
         FreeBlock* pItem = NULL;
         PoolChunk* pChunk = NULL;
         
         pChunk = m_chunkList.First();
         while (pChunk != NULL && pChunk->AllAllocd())
             pChunk = pChunk->pNextLightItem;
  
         if (pChunk == NULL)
         {
             pChunk = (PoolChunk *) TAlloc::Alloc( sizeof( PoolChunk ) );
             AkPlacementNew(pChunk) PoolChunk();
             STATS_NEWCHUNK();
             if (pChunk != NULL)
                 m_chunkList.AddFirst(pChunk);
         }
  
         if (pChunk != NULL)
         {
             pItem = pChunk->freeList.First();
             AKASSERT(pItem != NULL);
             pChunk->freeList.RemoveFirst();
             SCRUB_NEW_ALLOC(pItem);
             STATS_ALLOC();
         }
  
         return reinterpret_cast<T*>(pItem);
     }
  
     void Free( T* pObj )
     {
         SCRUB_FREE_BLOCK((void*)pObj);
         
         FreeBlock* pItem = reinterpret_cast<FreeBlock*>(pObj);
  
         PoolChunk* pPrevChunk = NULL;
         PoolChunk* pChunk = m_chunkList.First();
         while (pChunk != NULL && !pChunk->BelongsTo(pItem))
         {
             pPrevChunk = pChunk;
             pChunk = pChunk->pNextLightItem;
         }
  
         AKASSERT(pChunk != NULL);
         pChunk->freeList.AddFirst(pItem);
         STATS_FREE();
  
         if (pChunk->AllFree())
         {
             m_chunkList.RemoveItem(pChunk, pPrevChunk);
             pChunk->~PoolChunk();
             TAlloc::Free( pChunk );
             STATS_DELCHUNK();
         }
     }
  
     tChunkList m_chunkList;
  
 #ifdef AK_DYNA_BLK_STATS
     void Stats_Alloc()
     {
         uCurrentUsedBytes += sizeof(T);
         uPeakUsedBytes = AkMax(uCurrentUsedBytes, uPeakUsedBytes);
     }
     void Stats_NewChunk()
     {
         uCurrentAllocdBytes += sizeof(PoolChunk);
         uPeakAllocdBytes = AkMax(uCurrentAllocdBytes, uPeakAllocdBytes);
     }
     void Stats_Free()
     {
         uCurrentUsedBytes -= sizeof(T);
     }
     void Stats_DelChunk()
     {
         uCurrentAllocdBytes -= sizeof(PoolChunk);
     }
 public:
     AkUInt32 uPeakUsedBytes;
     AkUInt32 uPeakAllocdBytes;
     AkUInt32 uCurrentAllocdBytes;
     AkUInt32 uCurrentUsedBytes;
 #endif
 };
  
  
 #endif