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/*
* Memory Mapping Allocator
* (C) 1999-2007 Jack Lloyd
*
* Distributed under the terms of the Botan license
*/
#ifndef BOTAN_MMAP_ALLOCATOR_H__
#define BOTAN_MMAP_ALLOCATOR_H__
#include <botan/internal/mem_pool.h>
namespace Botan {
/**
* Allocator that uses memory maps backed by disk. We zeroize the map
* upon deallocation. If swap occurs, the VM will swap to the shared
* file backing rather than to a swap device, which means we know where
* it is and can zap it later.
*/
class MemoryMapping_Allocator : public Pooling_Allocator
{
public:
/**
* @param mutex used for internal locking
*/
MemoryMapping_Allocator(Mutex* mutex) : Pooling_Allocator(mutex) {}
std::string type() const { return "mmap"; }
private:
void* alloc_block(u32bit);
void dealloc_block(void*, u32bit);
};
}
#endif
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