mmap_mem.h

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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(size_t);
      void dealloc_block(void*, size_t);
   };
 
}
 
#endif