# 作業系統工程-Memory

## Table Of Content

###### tags: `作業系統工程 Operating System Programming note`, `110-1`, `2021`

[TOC]

---
# Memory
## Memory 在 rtdef 中的定義

#ifdef RT_USING_HEAP
struct rt_memory
{
    struct rt_object parent;   /**< inherit from rt_object */
    const char *     algorithm;/**< Memory management algorithm name */
    rt_ubase_t       address;  /**< memory start address */
    rt_size_t        total;    /**< memory size */
    rt_size_t        used;     /**< size used */
    rt_size_t        max;      /**< maximum usage */
};
typedef struct rt_memory *rt_mem_t;
#endif

# Memory Heap

## Memory Item 在 rtdef 中的定義

struct rt_memheap_item
{
    rt_uint32_t             magic;               /**< magic number for memheap */
    struct rt_memheap      *pool_ptr;            /**< point of pool */

    struct rt_memheap_item *next;                /**< next memheap item */
    struct rt_memheap_item *prev;                /**< prev memheap item */

    struct rt_memheap_item *next_free;           /**< next free memheap item */
    struct rt_memheap_item *prev_free;           /**< prev free memheap item */
#ifdef RT_USING_MEMTRACE
    rt_uint8_t              owner_thread_name[4];/**< owner thread name */
#endif
};

## Memory Heap 在 rtdef 中的定義

struct rt_memheap
{
    struct rt_object        parent;        /**< inherit from rt_object */

    void                   *start_addr;    /**< pool start address and size */

    rt_size_t               pool_size;                  /**< pool size */
    rt_size_t               available_size;/**< available size */
    rt_size_t               max_used_size; /**< maximum allocated size */

    struct rt_memheap_item *block_list;    /**< used block list */

    struct rt_memheap_item *free_list;     /**< free block list */
    struct rt_memheap_item  free_header;   /**< free block list header */

    struct rt_semaphore     lock;          /**< semaphore lock */
    rt_bool_t               locked;        /**< External lock mark */
};
#endif

# Memory Pool
## Memory Pool 在 rtdef 中的定義

#ifdef RT_USING_MEMPOOL
struct rt_mempool
{
    struct rt_object parent;           /**< inherit from rt_object */

    void            *start_address;    /**< memory pool start */
    rt_size_t        size;             /**< size of memory pool */

    rt_size_t        block_size;       /**< size of memory blocks */
    rt_uint8_t      *block_list;       /**< memory blocks list */

    rt_size_t        block_total_count;/**< numbers of memory block */
    rt_size_t        block_free_count; /**< numbers of free memory block */

    rt_list_t        suspend_thread;   /**< threads pended on this resource */
};
typedef struct rt_mempool *rt_mp_t;
#endif