DefaultMemoryPagePool.h

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#pragma once
 
#include "utils/MemoryPagePool.h"
#include "AIStatefulTaskMutex.h"
 
namespace statefultask {
 
class DefaultMemoryPagePoolBase
{
 protected:
  static utils::MemoryPagePool* s_instance;
 
 protected:
  static void init(utils::MemoryPagePool* mpp)
  {
    // Only create one DefaultMemoryPagePool object (at the top of main()).
    ASSERT(s_instance == nullptr);
    s_instance = mpp;
    AIStatefulTaskMutex::init(mpp);
  }
 
  DefaultMemoryPagePoolBase() = default;
  ~DefaultMemoryPagePoolBase()
  {
    delete s_instance;
    s_instance = nullptr;
  }
};
 
template<typename MPP = utils::MemoryPagePool>
class DefaultMemoryPagePool : private DefaultMemoryPagePoolBase
{
 public:
  DefaultMemoryPagePool(size_t block_size = 0x8000, utils::MemoryPagePool::blocks_t minimum_chunk_size = 0, utils::MemoryPagePool::blocks_t maximum_chunk_size = 0)
  {
    init(new MPP(block_size, minimum_chunk_size, maximum_chunk_size));
  }
 
  template<typename... ArgT>
  DefaultMemoryPagePool(ArgT&&... args)
  {
    init(new MPP(std::forward<ArgT>(args)...));
  }
 
  static utils::MemoryPagePool& instance()
  {
    // Create a statefultask::DefaultMemoryPagePool at the top of main,
    // and/or don't use anything from statefultask in constructors/destructors
    // of global and/or static objects.
    ASSERT(s_instance);
    return *s_instance;
  }
};
 
} // namespace statefultask
 
using AIMemoryPagePool = statefultask::DefaultMemoryPagePool<utils::MemoryPagePool>;