1.FreeRTOS List简易分析

FreeRTOS从简单的List入手

• 架构：Cortex-M3
• 版本：FreeRTOS V9.0.0
• 前言：打开List.c文件来看，200多行，并不是很多，详细看内容，其实就是一个双向链表的增和删

1.结构体List_t

typedef struct xLIST  
{  
   listFIRST_LIST_INTEGRITY_CHECK_VALUE		/*< Set to a known value if configUSE_LIST_DATA_INTEGRITY_CHECK_BYTES is set to 1. */  
   configLIST_VOLATILE UBaseType_t uxNumberOfItems;  
   ListItem_t * configLIST_VOLATILE pxIndex;	/*< Used to walk through the list.  Points to the last item returned by a call to   listGET_OWNER_OF_NEXT_ENTRY (). */  
   MiniListItem_t xListEnd;			/*< List item that contains the maximum possible item value meaning it is   always at the end of the list and is therefore used as a marker. */  
   listSECOND_LIST_INTEGRITY_CHECK_VALUE		/*< Set to a known value if configUSE_LIST_DATA_INTEGRITY_CHECK_BYTES is set to 1. */  
} List_t;

• 能力有限只能挑几个来讲C

变量名	作用
listFIRST_LIST_INTEGRITY_CHECK_VALUE	检查数据是否完整
uxNumberOfItems	挂接在这个链表的链表项数目
xListEnd	指向链表的