145 lines
3.3 KiB
C++
145 lines
3.3 KiB
C++
#pragma once
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#include <mutex>
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class MemoryPage;
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/// <summary>
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/// 内存页访问控制块
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/// </summary>
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struct PageControlBlock {
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uint16_t active_entities_count = 0; // 活跃element数量，决定是否需要卸载
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uint16_t byte_count_per_element = 32; // 单个element大小，16的倍数
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uint32_t total_buffer_size = 0; // 可用数据缓冲区大小
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uint64_t typecode_of_element = 0; // 元素类型标识码
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uint64_t curr_access_usec = 0; // 最近访问时间点，lsb：us
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uint32_t acc_count_per_cycle = 0; // 单周期内累积访问次数
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uint32_t un_used = 0;
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std::mutex access_protected; // 内存数据访问保护锁
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};
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/// <summary>
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/// 内存页面16K大小
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/// </summary>
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class MemoryPage {
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private:
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PageControlBlock pcb;
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char data_buffer[16 * 1024 - (sizeof(PageControlBlock) / 8 + 1) * 8] = {};
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public:
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/// <summary>
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/// 构建内存页
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/// </summary>
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/// <param name="raw_element_size_16B">原始element尺寸</param>
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explicit MemoryPage(uint16_t raw_element_size_16B, uint64_t typecode);
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/// <summary>
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/// 记录单次访问时间
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/// </summary>
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/// <param name="timepoint_usec"></param>
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void accessRecord(uint64_t timepoint_usec);
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/// <summary>
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/// 清除访问次数记录
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/// </summary>
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/// <returns>上一周期累积次数</returns>
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uint32_t timesClear();
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/// <summary>
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/// 获取访问记录
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/// </summary>
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/// <returns>{最近访问时间,累积次数}</returns>
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std::pair<uint64_t, uint32_t> getRecords() const;
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/// <summary>
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/// 加锁，在release之前不能访问本类型任何接口，否则会造成死锁
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/// </summary>
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void lock();
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/// <summary>
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/// 解锁
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/// </summary>
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void release();
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/// <summary>
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/// 获取element元素数据访问指针
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/// </summary>
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/// <param name="index">元素索引</param>
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/// <param name="active_set">是否设置</param>
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/// <returns>数据指针</returns>
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char* getElementPtr(int index);
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/// <summary>
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/// 元素类型码
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/// </summary>
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/// <returns></returns>
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uint64_t elementTypeCode() const;
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/// <summary>
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/// 获取单个元素尺寸
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/// </summary>
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/// <returns>字节数量</returns>
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uint16_t elementSize() const;
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/// <summary>
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/// 获取元素数量
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/// </summary>
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/// <returns></returns>
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uint16_t elementCount() const;
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};
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/// <summary>
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/// 元素访问控制块
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/// </summary>
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struct ElementControlBlock {
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uint8_t active_mark = 0; // 活跃标志
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uint8_t backup_1 = 0;
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uint16_t byte_count = 16; // 该元素字节长度，16的倍数
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uint16_t element_index = 0; // 本元素在Page中的索引
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uint16_t backup_2 = 0;
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MemoryPage* page_refer = nullptr; // 页面关联指针
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void* extend_bind = nullptr; // 绑定控制块内存指针
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};
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/// <summary>
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/// 内存元素访问接口
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/// </summary>
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class MemoryElement {
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private:
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ElementControlBlock* const data_ptr;
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uint32_t buffer_offset = 0;
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public:
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static uint32_t validOffset();
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static uint32_t rawSize(uint32_t data_type_size);
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/// <summary>
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/// 构建内存元素访问接口
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/// </summary>
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/// <param name="access_bind"></param>
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MemoryElement(char* access_bind);
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/// <summary>
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/// 更新最终访问时间
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/// </summary>
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/// <param name="time_usec"></param>
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void accessRecUpdate(uint64_t time_usec);
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/// <summary>
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/// 数据活跃状态
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/// </summary>
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/// <returns></returns>
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uint8_t isActived() const;
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/// <summary>
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/// 设置数据活跃状态
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/// </summary>
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/// <param name="ste"></param>
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void setActive(uint8_t ste);
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/// <summary>
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/// 锁定数据，返回数据存储内存指针
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/// </summary>
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/// <returns></returns>
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char* dataLock();
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/// <summary>
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/// 解锁数据
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/// </summary>
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void release();
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}; |