vTaskSetApplicationTaskTag
[任务控制]

task. h


void vTaskSetApplicationTaskTag(
                        TaskHandle_t xTask,
                        TaskHookFunction_t pxTagValue );

configUSE_APPLICATION_TASK_TAG 必须定义为 1，此函数才可用。有关详细信息，请参阅 RTOS 配置文档。

可为每个任务分配“标签”值。此值仅供应用程序使用，RTOS 内核本身无法使用此值。 RTOS 跟踪宏文档页面提供了一个很好的示例，说明了应用程序如何使用此功能。

参数：

xTask	正在向其分配标签值的任务的句柄。将 xTask 作为 NULL 传递会导致将标签分配给调用任务。
pxTagValue	正在分配给任务标签的值。该值为 TaskHookFunction_t 类型，可将函数指针赋值为标签，尽管实际上可以分配任何值。请参阅以下示例。

示例用法：



/* In this example an integer is set as the task tag value.  
See the RTOS trace hook macros documentation page for an 
example how such an assignment can be used. */
void vATask( void *pvParameters )
{
  /* Assign a tag value of 1 to myself. */
  vTaskSetApplicationTaskTag( NULL, ( void * ) 1 );

  for( ;; )
  {
    /* Rest of task code goes here. */
  }
}
/***********************************************/

/* In this example a callback function is being assigned as the task tag.
First define the callback function - this must have type TaskHookFunction_t
as per this example. */
static BaseType_t prvExampleTaskHook( void * pvParameter )
{
  /* Perform some action - this could be anything from logging a value,
  updating the task state, outputting a value, etc. */

  return 0;
}

/* Now define the task that sets prvExampleTaskHook as its hook/tag value.
This is in fact registering the task callback, as described on the
xTaskCallApplicationTaskHook() documentation page. */
void vAnotherTask( void *pvParameters )
{
  /* Register our callback function. */
  vTaskSetApplicationTaskTag( NULL, prvExampleTaskHook );

  for( ;; )
  {
    /* Rest of task code goes here. */
  }
}

/* As an example use of the hook (callback) we can get the RTOS kernel to call the
hook function of each task that is being switched out during a reschedule. */
#define traceTASK_SWITCHED_OUT() xTaskCallApplicationTaskHook( pxCurrentTCB,
                                    0 )

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vTaskSetApplicationTaskTag [任务控制]

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vTaskSetApplicationTaskTag
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