tasks.c

freescale k40/k60 freertos-lwip例程

			}while( uxQueue > ( unsigned short ) tskIDLE_PRIORITY );

			if( !listLIST_IS_EMPTY( pxDelayedTaskList ) )
			{
				prvListTaskWithinSingleList( pcWriteBuffer, ( xList * ) pxDelayedTaskList, tskBLOCKED_CHAR );
			}

			if( !listLIST_IS_EMPTY( pxOverflowDelayedTaskList ) )
			{
				prvListTaskWithinSingleList( pcWriteBuffer, ( xList * ) pxOverflowDelayedTaskList, tskBLOCKED_CHAR );
			}

			#if( INCLUDE_vTaskDelete == 1 )
			{
				if( !listLIST_IS_EMPTY( &xTasksWaitingTermination ) )
				{
					prvListTaskWithinSingleList( pcWriteBuffer, ( xList * ) &xTasksWaitingTermination, tskDELETED_CHAR );
				}
			}
			#endif

			#if ( INCLUDE_vTaskSuspend == 1 )
			{
				if( !listLIST_IS_EMPTY( &xSuspendedTaskList ) )
				{
					prvListTaskWithinSingleList( pcWriteBuffer, ( xList * ) &xSuspendedTaskList, tskSUSPENDED_CHAR );
				}
			}
			#endif
		}
		xTaskResumeAll();
	}

#endif
/*----------------------------------------------------------*/

#if ( configGENERATE_RUN_TIME_STATS == 1 )

	void vTaskGetRunTimeStats( signed char *pcWriteBuffer )
	{
	unsigned portBASE_TYPE uxQueue;
	unsigned long ulTotalRunTime = portGET_RUN_TIME_COUNTER_VALUE();

		/* This is a VERY costly function that should be used for debug only.
		It leaves interrupts disabled for a LONG time. */

		vTaskSuspendAll();
		{
			/* Run through all the lists that could potentially contain a TCB,
			generating a table of run timer percentages in the provided
			buffer. */

			pcWriteBuffer[ 0 ] = ( signed char ) 0x00;
			strcat( ( char * ) pcWriteBuffer, ( const char * ) "\r\n" );

			uxQueue = uxTopUsedPriority + 1;

			do
			{
				uxQueue--;

				if( !listLIST_IS_EMPTY( &( pxReadyTasksLists[ uxQueue ] ) ) )
				{
					prvGenerateRunTimeStatsForTasksInList( pcWriteBuffer, ( xList * ) &( pxReadyTasksLists[ uxQueue ] ), ulTotalRunTime );
				}
			}while( uxQueue > ( unsigned short ) tskIDLE_PRIORITY );

			if( !listLIST_IS_EMPTY( pxDelayedTaskList ) )
			{
				prvGenerateRunTimeStatsForTasksInList( pcWriteBuffer, ( xList * ) pxDelayedTaskList, ulTotalRunTime );
			}

			if( !listLIST_IS_EMPTY( pxOverflowDelayedTaskList ) )
			{
				prvGenerateRunTimeStatsForTasksInList( pcWriteBuffer, ( xList * ) pxOverflowDelayedTaskList, ulTotalRunTime );
			}

			#if ( INCLUDE_vTaskDelete == 1 )
			{
				if( !listLIST_IS_EMPTY( &xTasksWaitingTermination ) )
				{
					prvGenerateRunTimeStatsForTasksInList( pcWriteBuffer, ( xList * ) &xTasksWaitingTermination, ulTotalRunTime );
				}
			}
			#endif

			#if ( INCLUDE_vTaskSuspend == 1 )
			{
				if( !listLIST_IS_EMPTY( &xSuspendedTaskList ) )
				{
					prvGenerateRunTimeStatsForTasksInList( pcWriteBuffer, ( xList * ) &xSuspendedTaskList, ulTotalRunTime );
				}
			}
			#endif
		}
		xTaskResumeAll();
	}

#endif
/*----------------------------------------------------------*/

#if ( configUSE_TRACE_FACILITY == 1 )

	void vTaskStartTrace( signed char * pcBuffer, unsigned long ulBufferSize )
	{
		portENTER_CRITICAL();
		{
			pcTraceBuffer = ( signed char * )pcBuffer;
			pcTraceBufferStart = pcBuffer;
			pcTraceBufferEnd = pcBuffer + ( ulBufferSize - tskSIZE_OF_EACH_TRACE_LINE );
			xTracing = pdTRUE;
		}
		portEXIT_CRITICAL();
	}

#endif
/*----------------------------------------------------------*/

#if ( configUSE_TRACE_FACILITY == 1 )

	unsigned long ulTaskEndTrace( void )
	{
	unsigned long ulBufferLength;

		portENTER_CRITICAL();
			xTracing = pdFALSE;
		portEXIT_CRITICAL();

		ulBufferLength = ( unsigned long ) ( pcTraceBuffer - pcTraceBufferStart );

		return ulBufferLength;
	}

#endif



/*-----------------------------------------------------------
 * SCHEDULER INTERNALS AVAILABLE FOR PORTING PURPOSES
 * documented in task.h
 *----------------------------------------------------------*/


void vTaskIncrementTick( void )
{
	/* Called by the portable layer each time a tick interrupt occurs.
	Increments the tick then checks to see if the new tick value will cause any
	tasks to be unblocked. */
	if( uxSchedulerSuspended == ( unsigned portBASE_TYPE ) pdFALSE )
	{
		++xTickCount;
		if( xTickCount == ( portTickType ) 0 )
		{
			xList *pxTemp;

			/* Tick count has overflowed so we need to swap the delay lists.
			If there are any items in pxDelayedTaskList here then there is
			an error! */
			pxTemp = pxDelayedTaskList;
			pxDelayedTaskList = pxOverflowDelayedTaskList;
			pxOverflowDelayedTaskList = pxTemp;
			xNumOfOverflows++;
		}

		/* See if this tick has made a timeout expire. */
		prvCheckDelayedTasks();
	}
	else
	{
		++uxMissedTicks;

		/* The tick hook gets called at regular intervals, even if the
		scheduler is locked. */
		#if ( configUSE_TICK_HOOK == 1 )
		{
			extern void vApplicationTickHook( void );

			vApplicationTickHook();
		}
		#endif
	}

	#if ( configUSE_TICK_HOOK == 1 )
	{
		extern void vApplicationTickHook( void );

		/* Guard against the tick hook being called when the missed tick
		count is being unwound (when the scheduler is being unlocked. */
		if( uxMissedTicks == 0 )
		{
			vApplicationTickHook();
		}
	}
	#endif

	traceTASK_INCREMENT_TICK( xTickCount );
}
/*-----------------------------------------------------------*/

#if ( ( INCLUDE_vTaskCleanUpResources == 1 ) && ( INCLUDE_vTaskSuspend == 1 ) )

	void vTaskCleanUpResources( void )
	{
	unsigned short usQueue;
	volatile tskTCB *pxTCB;

		usQueue = ( unsigned short ) uxTopUsedPriority + ( unsigned short ) 1;

		/* Remove any TCB's from the ready queues. */
		do
		{
			usQueue--;

			while( !listLIST_IS_EMPTY( &( pxReadyTasksLists[ usQueue ] ) ) )
			{
				listGET_OWNER_OF_NEXT_ENTRY( pxTCB, &( pxReadyTasksLists[ usQueue ] ) );
				vListRemove( ( xListItem * ) &( pxTCB->xGenericListItem ) );

				prvDeleteTCB( ( tskTCB * ) pxTCB );
			}
		}while( usQueue > ( unsigned short ) tskIDLE_PRIORITY );

		/* Remove any TCB's from the delayed queue. */
		while( !listLIST_IS_EMPTY( &xDelayedTaskList1 ) )
		{
			listGET_OWNER_OF_NEXT_ENTRY( pxTCB, &xDelayedTaskList1 );
			vListRemove( ( xListItem * ) &( pxTCB->xGenericListItem ) );

			prvDeleteTCB( ( tskTCB * ) pxTCB );
		}

		/* Remove any TCB's from the overflow delayed queue. */
		while( !listLIST_IS_EMPTY( &xDelayedTaskList2 ) )
		{
			listGET_OWNER_OF_NEXT_ENTRY( pxTCB, &xDelayedTaskList2 );
			vListRemove( ( xListItem * ) &( pxTCB->xGenericListItem ) );

			prvDeleteTCB( ( tskTCB * ) pxTCB );
		}

		while( !listLIST_IS_EMPTY( &xSuspendedTaskList ) )
		{
			listGET_OWNER_OF_NEXT_ENTRY( pxTCB, &xSuspendedTaskList );
			vListRemove( ( xListItem * ) &( pxTCB->xGenericListItem ) );

			prvDeleteTCB( ( tskTCB * ) pxTCB );
		}
	}

#endif
/*-----------------------------------------------------------*/

#if ( configUSE_APPLICATION_TASK_TAG == 1 )

	void vTaskSetApplicationTaskTag( xTaskHandle xTask, pdTASK_HOOK_CODE pxTagValue )
	{
	tskTCB *xTCB;

		/* If xTask is NULL then we are setting our own task hook. */
		if( xTask == NULL )
		{
			xTCB = ( tskTCB * ) pxCurrentTCB;
		}
		else
		{
			xTCB = ( tskTCB * ) xTask;
		}

		/* Save the hook function in the TCB.  A critical section is required as
		the value can be accessed from an interrupt. */
		portENTER_CRITICAL();
			xTCB->pxTaskTag = pxTagValue;
		portEXIT_CRITICAL();
	}

#endif
/*-----------------------------------------------------------*/

#if ( configUSE_APPLICATION_TASK_TAG == 1 )

	pdTASK_HOOK_CODE xTaskGetApplicationTaskTag( xTaskHandle xTask )
	{
	tskTCB *xTCB;
	pdTASK_HOOK_CODE xReturn;

		/* If xTask is NULL then we are setting our own task hook. */
		if( xTask == NULL )
		{
			xTCB = ( tskTCB * ) pxCurrentTCB;
		}
		else
		{
			xTCB = ( tskTCB * ) xTask;
		}

		/* Save the hook function in the TCB.  A critical section is required as
		the value can be accessed from an interrupt. */
		portENTER_CRITICAL();
			xReturn = xTCB->pxTaskTag;
		portEXIT_CRITICAL();

		return xReturn;
	}

#endif
/*-----------------------------------------------------------*/

#if ( configUSE_APPLICATION_TASK_TAG == 1 )

	portBASE_TYPE xTaskCallApplicationTaskHook( xTaskHandle xTask, void *pvParameter )
	{
	tskTCB *xTCB;
	portBASE_TYPE xReturn;

		/* If xTask is NULL then we are calling our own task hook. */
		if( xTask == NULL )
		{
			xTCB = ( tskTCB * ) pxCurrentTCB;
		}
		else
		{
			xTCB = ( tskTCB * ) xTask;
		}

		if( xTCB->pxTaskTag != NULL )
		{
			xReturn = xTCB->pxTaskTag( pvParameter );
		}
		else
		{
			xReturn = pdFAIL;
		}

		return xReturn;
	}

#endif
/*-----------------------------------------------------------*/

void vTaskSwitchContext( void )
{
	if( uxSchedulerSuspended != ( unsigned portBASE_TYPE ) pdFALSE )
	{
		/* The scheduler is currently suspended - do not allow a context
		switch. */
		xMissedYield = pdTRUE;
		return;
	}

	traceTASK_SWITCHED_OUT();

	#if ( configGENERATE_RUN_TIME_STATS == 1 )
	{
		unsigned long ulTempCounter = portGET_RUN_TIME_COUNTER_VALUE();

			/* Add the amount of time the task has been running to the accumulated
			time so far.  The time the task started running was stored in
			ulTaskSwitchedInTime.  Note that there is no overflow protection here
			so count values are only valid until the timer overflows.  Generally
			this will be about 1 hour assuming a 1uS timer increment. */
			pxCurrentTCB->ulRunTimeCounter += ( ulTempCounter - ulTaskSwitchedInTime );
			ulTaskSwitchedInTime = ulTempCounter;
	}
	#endif

	taskFIRST_CHECK_FOR_STACK_OVERFLOW();
	taskSECOND_CHECK_FOR_STACK_OVERFLOW();

	/* Find the highest priority queue that contains ready tasks. */
	while( listLIST_IS_EMPTY( &( pxReadyTasksLists[ uxTopReadyPriority ] ) ) )
	{
		--uxTopReadyPriority;
	}

	/* listGET_OWNER_OF_NEXT_ENTRY walks through the list, so the tasks of the
	same priority get an equal share of the processor time. */
	listGET_OWNER_OF_NEXT_ENTRY( pxCurrentTCB, &( pxReadyTasksLists[ uxTopReadyPriority ] ) );

	traceTASK_SWITCHED_IN();
	vWriteTraceToBuffer();
}
/*-----------------------------------------------------------*/

void vTaskPlaceOnEventList( const xList * const pxEventList, portTickType xTicksToWait )
{
portTickType xTimeToWake;

	/* THIS FUNCTION MUST BE CALLED WITH INTERRUPTS DISABLED OR THE
	SCHEDULER SUSPENDED. */

	/* Place the event list item of the TCB in the appropriate event list.
	This is placed in the list in priority order so the highest priority task
	is the first to be woken by the event. */
	vListInsert( ( xList * ) pxEventList, ( xListItem * ) &( pxCurrentTCB->xEventListItem ) );

	/* We must remove ourselves from the ready list before adding ourselves
	to the blocked list as the same list item is used for both lists.  We have
	exclusive access to the ready lists as the scheduler is locked. */
	vListRemove( ( xListItem * ) &( pxCurrentTCB->xGenericListItem ) );


	#if ( INCLUDE_vTaskSuspend == 1 )
	{
		if( xTicksToWait == portMAX_DELAY )