locking_allocator.h

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/*
* Mlock Allocator
* (C) 2012 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
 
#ifndef BOTAN_MLOCK_ALLOCATOR_H_
#define BOTAN_MLOCK_ALLOCATOR_H_
 
#include <botan/types.h>
#include <memory>
#include <vector>
 
namespace Botan {
 
class Memory_Pool;
 
class mlock_allocator final {
   public:
      static mlock_allocator& instance() noexcept;
 
      void* allocate(size_t num_elems, size_t elem_size);
 
      bool deallocate(void* p, size_t num_elems, size_t elem_size) noexcept;
 
      mlock_allocator(const mlock_allocator&) = delete;
      mlock_allocator(mlock_allocator&&) = delete;
      mlock_allocator& operator=(const mlock_allocator&) = delete;
      mlock_allocator& operator=(mlock_allocator&&) = delete;
 
      mlock_allocator() noexcept;
 
      ~mlock_allocator();
 
   private:
      std::unique_ptr<Memory_Pool> m_pool;
      std::vector<void*> m_locked_pages;
};
 
}  // namespace Botan
 
#endif