_ak_dyna_blk_pool_8h

Wwise SDK 2019.1.11

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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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   Version: <VERSION>  Build: <BUILDNUMBER>

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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