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/*
* (C) 2018 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#ifndef BOTAN_MEM_POOL_H_
#define BOTAN_MEM_POOL_H_
#include <botan/types.h>
#include <botan/mutex.h>
#include <vector>
namespace Botan {
class Memory_Pool final
{
public:
/**
* Initialize a memory pool. The memory is not owned by *this,
* it must be freed by the caller.
* @param pool the pool
* @param pool_size size of pool
* @param page_size some nominal page size (does not need to match
* the system page size)
* @param min_allocation return null for allocs for smaller amounts
* @param max_allocation return null for allocs of larger amounts
* @param align_bit align all returned memory to (1<<align_bit) bytes
*/
Memory_Pool(uint8_t* pool,
size_t pool_size,
size_t page_size,
size_t min_allocation,
size_t max_allocation,
uint8_t align_bit);
void* allocate(size_t size);
bool deallocate(void* p, size_t size) BOTAN_NOEXCEPT;
Memory_Pool(const Memory_Pool&) = delete;
Memory_Pool& operator=(const Memory_Pool&) = delete;
private:
const size_t m_page_size = 0;
const size_t m_min_alloc = 0;
const size_t m_max_alloc = 0;
const uint8_t m_align_bit = 0;
mutex_type m_mutex;
std::vector<std::pair<size_t, size_t>> m_freelist;
uint8_t* m_pool = nullptr;
size_t m_pool_size = 0;
};
}
#endif
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