94 lines
2.1 KiB
C
94 lines
2.1 KiB
C
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/**
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\file AreaMemoryManager.h
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\maintainer Morgan McGuire, http://graphics.cs.williams.edu
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\created 2009-01-20
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\edited 2010-10-29
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Copyright 2000-2012, Morgan McGuire.
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All rights reserved.
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*/
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#ifndef G3D_AreaMemoryManager_h
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#define G3D_AreaMemoryManager_h
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#include "G3D/platform.h"
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#include "G3D/g3dmath.h"
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#include "G3D/Array.h"
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#include "G3D/MemoryManager.h"
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namespace G3D {
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/**
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\brief Allocates memory in large blocks and then frees it as an area.
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Useful for ensuring cache coherence and for reducing the time cost of
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multiple allocations and deallocations.
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<b>Not threadsafe</b>
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*/
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class AreaMemoryManager : public MemoryManager {
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private:
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class Buffer {
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private:
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uint8* m_first;
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size_t m_size;
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size_t m_used;
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public:
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Buffer(size_t size);
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~Buffer();
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/** Returns NULL if out of space */
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void* alloc(size_t s);
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};
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size_t m_sizeHint;
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/** The underlying array is stored in regular MemoryManager heap memory */
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Array<Buffer*> m_bufferArray;
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AreaMemoryManager(size_t sizeHint);
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public:
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typedef shared_ptr<AreaMemoryManager> Ref;
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/**
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\param sizeHint Total amount of memory expected to be allocated.
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The allocator will allocate memory from the system in increments
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of this size.
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*/
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static AreaMemoryManager::Ref create(size_t sizeHint = 10 * 1024 * 1024);
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/** Invokes deallocateAll. */
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~AreaMemoryManager();
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size_t bytesAllocated() const;
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/** Allocates memory out of the buffer pool.
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@param s must be no larger than sizeHint */
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virtual void* alloc(size_t s);
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/** Ignored. */
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virtual void free(void* x);
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virtual bool isThreadsafe() const;
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/** Deletes all previously allocated memory. Because delete is not
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invoked on objects in this memory, it is not safe to simply
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free memory containing C++ objects that expect their destructors
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to be called. */
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void deallocateAll();
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};
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typedef AreaMemoryManager CoherentAllocator;
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}
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#endif
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