FreeRTOS 任务句柄（详解）

BaseType_t xTaskCreate(	TaskFunction_t pxTaskCode,
		        const char * const pcName,/*lint !e971 Unqualified char types are allowed for strings and single characters only. */
			const configSTACK_DEPTH_TYPE usStackDepth,
			void * const pvParameters,
			UBaseType_t uxPriority,
			TaskHandle_t * const pxCreatedTask )//任务句柄函数原型

xReturned = xTaskCreate(
                    vTaskCode,       /* Function that implements the task. */
                    "NAME",          /* Text name for the task. */
                    STACK_SIZE,      /* Stack size in words, not bytes. */
                    ( void * ) 1,    /* Parameter passed into the task. */
                    tskIDLE_PRIORITY,/* Priority at which the task is created. */
                    &xHandle );      /* Used to pass out the created task's handle.//任务句柄函数原型 */

• 最后一个参数是任务句柄参数（简称：TCB）TaskControlBlock
• 翻译如下：用于传递创建的任务句柄
• 估计看到这也不知道啥意思，请往下看 TaskHandle_t 任务句柄函数指针的定义

struct tskTaskControlBlock; /* 原型 The old naming convention is used 
to prevent breaking kernel aware debuggers. */
typedef struct tskTaskControlBlock* TaskHandle_t;/*重新定义了*/

• 任务句柄的源码  （条件编译去掉了，太长，画重点）

/*
 * Task control block.  A task control block (TCB) is allocated for each task,
 * and stores task state information, including a pointer to the task's context
 * (the task's run time environment, including register values)
 */
typedef struct tskTaskControlBlock 			/* The old naming convention is used to prevent breaking kernel aware debuggers. */
{
	volatile StackType_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. */

	ListItem_t	xStateListItem;	/*任务状态列表< The list that the state list item of a task is reference from denotes the state of that task (Ready, Blocked, Suspended ). */
	ListItem_t	xEventListItem;		/*任务事件列表< Used to reference a task from an event list. */
	UBaseType_t	uxPriority;			/*优先级< The priority of the task.  0 is the lowest priority. */
	StackType_t	*pxStack;			/*栈指针< Points to the start of the stack. */
	char		pcTaskName[ configMAX_TASK_NAME_LEN ];/*< Descriptive name given to the task when created.  Facilitates debugging only. */ /*lint !e971 Unqualified char types are allowed for strings and single characters only. */
} tskTCB;//说明任务句柄包含创建任务的所有状态，说成任务的身份证最为合适，想删除，直接抹掉身份证就可以了

• 说明任务句柄包含创建任务的所有状态，说成任务的身份证最为合适，想删除，直接抹掉身份证就可以了

/*
 * Task control block.  A task control block (TCB) is allocated for each task,
 * and stores task state information, including a pointer to the task's context
 * (the task's run time environment, including register values)
 *任务控制块。 为每个任务分配一个任务控制块（TCB），
 *并存储任务状态信息，包括指向任务上下文的指针
 *（任务的运行时环境，包括寄存器值）
 */

• 任务句柄，在FreeRTOS又叫任务控制块，包含创建任务的所有信息，所有删除任务就可以这样来做

/* 任务创建后，用删除任务句柄来删除此任务The task was created.  Use the task's handle to delete the task. */
vTaskDelete( xHandle );