freertos关键函数理解 uxListRemove

//删除pxItemToRemove节点
UBaseType_t uxListRemove(ListItem_t *pxItemToRemove)
{              
//The list item knows which list it is in.  Obtain the list from the list item.
//找到节点所在的链表

    //my_printf( "uxListRemove pxItemToRemove = %#p\n", pxItemToRemove );

    
List_t *pxList = pxItemToRemove->pxContainer;

List_t *pxList_;          //指向目标优先级的就绪任务列表 (通过TCB的优先级索引)
//pxList_ = &pxReadyTasksLists[4];

    //my_printf( "pxList = %#p\n", pxList );
//my_printf( "pxList->uxNumberOfItems = %d\n", pxList->uxNumberOfItems );
//my_printf( "&pxList->uxNumberOfItems = %#p\n", &pxList->uxNumberOfItems );
//my_printf( "pxList->pxIndex = %#p\n", pxList->pxIndex );
//my_printf( "&pxList->pxIndex = %#p\n", &pxList->pxIndex );
//my_printf( "pxList->pxIndex->pvOwner = %#p\n", pxList->pxIndex->pvOwner );
//my_printf( "pxList->pxIndex->pxContainer = %#p\n", pxList->pxIndex->pxContainer );

    //|------->volatile UBaseType_t uxNumberOfItems = 1  0x20000088  链表中元素的个数          
//| |<-----ListItem_t *pxIndex;                         0x2000008c  总是指向xListEnd节点,在链表尾部插入的时候,方便找到位置
//| |  |-->TickType_t xItemValue = portMAX_DELAY     0x20000090  [MiniListItem_t xListEnd]   
//| |  |   struct xLIST_ITEM *pxNext;     ----->|    0x20000094  后继节点
//| |  |   struct xLIST_ITEM *pxPrevious; ----->|    0x20000098  前驱节点    
//| |  |                                        |                  
//| |--|-->TickType_t xItemValue; <-------------|    0x200004ac  链表节点的值        
//|    |<--struct xLIST_ITEM *pxNext;                            后继节点
//|    |<--struct xLIST_ITEM *pxPrevious;                        前驱节点
//|        void *pvOwner;                            0x200004a8  保存私有数据         [ &TCB ]
//|<------ struct xLIST *pxContainer;                0x20000088  节点所在的链表 [ &pxReadyTasksLists[x] ]

    pxItemToRemove->pxNext->pxPrevious = pxItemToRemove->pxPrevious;
pxItemToRemove->pxPrevious->pxNext = pxItemToRemove->pxNext;

    //Make sure the index is left pointing to a valid item. 
if( pxList->pxIndex == pxItemToRemove ){
pxList->pxIndex = pxItemToRemove->pxPrevious;
}
pxItemToRemove->pxContainer = NULL;
pxList->uxNumberOfItems--;

//         volatile UBaseType_t uxNumberOfItems = 0  0x20000088  链表中元素的个数          
//  |<-----ListItem_t *pxIndex;                         0x2000008c  总是指向xListEnd节点,在链表尾部插入的时候,方便找到位置
//  |->|-->TickType_t xItemValue = portMAX_DELAY     0x20000090  [MiniListItem_t xListEnd]   
//     |<--struct xLIST_ITEM *pxNext;                0x20000094  后继节点
//     |<--struct xLIST_ITEM *pxPrevious;            0x20000098  前驱节点    


//返回剩余节点数
return pxList->uxNumberOfItems;
}