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