freertos关键函数理解 uxListRemove

最新推荐文章于 2025-07-23 09:00:03 发布

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最新推荐文章于 2025-07-23 09:00:03 发布

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文章标签：算法

本文链接：https://blog.youkuaiyun.com/dp__mcu/article/details/149549370

//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;
}