e.taskSELECT_HIGHEST_PRIORITY_TASK(): 选择优先级最高的就绪任务作为下一个要执行的任务。具体实现可能是C语言代码或者汇编代码,用于选择任务。 f.traceTASK_SWITCHED_IN(): 执行任务切换后的跟踪操作,用于记录新任务被切入的事件。 g.#if ( configUSE_NEWLIB_REENTRANT == 1 ): 如果开启了Newlib的重入支持。
the queue in the order of their wake time - meaning once one task has been found whose block time has not expired there is no need to look any further down the list. */if( xConstTickCount >= xNextTaskUnblockTime ) {for( ;; ) {if( listLIST_IS_EMPTY( pxDelayedTaskList ) != pd...
task一般由running state跳转到blocked state,在blocked state等待事件触发(这里的事件又可分为周期事件和同步事件),当有相应的事件发生时,task并不会立马切换到运行状态,而是进入到“Ready State”,当上一个任务进入到Block状态时,处于“Ready State”的task依据优先级顺序依次替补执行。而“Suspended State”一般在实际...
*/typedefstructtskTaskControlBlock{volatileStackType_t *pxTopOfStack;/*< Points to the location of the last item placed on the tasks stack. THIS MUST BE THE FIRST MEMBER OF THE TCB STRUCT. */#if( portUSING_MPU_WRAPPERS == 1 )xMPU_SETTINGS xMPUSettings;/*< The MPU settings are defin...
while()循环从优先级uxTopReadyPriority开始,循环走下去从pxReadyTasksLists[]数组里找到就绪任务优先级最高的那个。接着listGET_OWNER_OF_NEXT_ENTRY()就抢占那个就绪列表中优先级最高的下一个就绪任务。pxCurrentTCB指向了优先级最高的任务,并且当vTaskSwitchContext()返回硬件相关代码时开始运行那个任务。
这里面taskA与taskB通过队列Queue来进行数据交互，taskA依次向Queue中发送数据，而当taskB需要读出时，...
* This is placed in the list in priority order so the highest priority task * is the first to be woken by the event. The queue that contains the event * list is locked, preventing simultaneous access from interrupts. */vListInsert(pxEventList,&(pxCurrentTCB->xEventListItem));prvAddCurren...
priority order so the highest priority task* is the first to be woken by the event. The queue that contains the event* list is locked, preventing simultaneous access from interrupts. */vListInsert( pxEventList, &( pxCurrentTCB->xEventListItem ) );prvAddCurrentTaskToDelayedList( xTicksToWait...
Unbounded priority inversion occurs when a medium priority task (Task M) interrupts Task L while it holds the lock. It’s called “unbounded” because Task M can now effectively block Task H for any amount of time, as Task M is preempting Task L (which still holds the lock). ...
UBaseType_t uxPriority, TaskHandle_t *constpxCreatedTask ) 解释一下这些参数 参数1pxTaskCode 任务函数名 参数2pcName 任务名字 (就是个字符串,别和参数1搞混) 参数3usStackDepth(堆) 栈深度 参数4pvParameters 任务函数参数 参数5uxPriority 任务优先级 ...