shm/Project4/shm_manager.h

#pragma once
#include "shm.h"
#include "page_heap.h"
#include "size_map.h"



namespace bg
{
    namespace detail
    {
        struct ChunkCache
        {
            struct ClassCache
            {
                Span free_list;
                size_t span_count{};
            };

            ClassCache m_caches[87]{};
        };


        class ShmManager
        {
        public:
            struct ShmBlock
            {
                void* addr{};
                size_t used_size{};
                size_t real_size{};
                size_t mmap_size{};

            };
            ShmManager(const bg::ShmOptions&);
            ~ShmManager();
            void* AllocateRawMemory(size_t* bytes, size_t alignment);


            bool HasSingleton(const bg::detail::TypeName& type);

            void* GetSingleton(const bg::detail::TypeName& type, size_t bytes, bool* first_call);

            void FreeSingleton(const bg::detail::TypeName& type);

            bool OnResume(const char* identifier);

            bool OnCreate(void);

            bool DeleteBlock(size_t index);

            void* AllocateInBlock(size_t index, size_t bytes, size_t alignment);

            bool CreateBlock(size_t index, size_t min_size);

            bool AttachBlock(size_t index);

            bool ResizeBlock(size_t index, const char* new_size);

            using SingletonMap = std::map<TypeName, void*, std::equal_to<TypeName>, ShmAllocator<std::pair<const TypeName, void*>>>;

            ChunkCache m_chunk_cache;
            SizeMap m_size_map;
            char m_magic[64]{};
            PageHeap m_page_heap;

            uint64_t m_version = 0;
            size_t m_block_count = 0;
            SingletonMap* m_singletons{};

            ShmOptions m_options;
            ShmBlock m_blocks[256];

        };


    }


}