Core kernel code changes:

+ Added xTaskAbortDelay() function, which causes a task to exit the Blocked state even before the timeout has expired or the event the task is waiting for has occurred.
+ For efficiency and code size reasons on some architectures, replace many instances of "== pdTRUE" with "!= pdFALSE".

FreeRTOS/Source/include/task.h

@@ -744,6 +744,31 @@ void vTaskDelay( const TickType_t xTicksToDelay ) PRIVILEGED_FUNCTION;
  */
 void vTaskDelayUntil( TickType_t * const pxPreviousWakeTime, const TickType_t xTimeIncrement ) PRIVILEGED_FUNCTION;
 
+/**
+ * task. h
+ * <pre>BaseType_t xTaskAbortDelay( TaskHandle_t xTask );</pre>
+ *
+ * INCLUDE_xTaskAbortDelay must be defined as 1 in FreeRTOSConfig.h for this
+ * function to be available.
+ *
+ * A task will enter the Blocked state when it is waiting for an event.  The
+ * event it is waiting for can be a temporal event (waiting for a time), such
+ * as when vTaskDelay() is called, or an event on an object, such as when
+ * xQueueReceive() or ulTaskNotifyTake() is called.  If the handle of a task
+ * that is in the Blocked state is used in a call to xTaskAbortDelay() then the
+ * task will leave the Blocked state, and return from whichever function call
+ * placed the task into the Blocked state.
+ *
+ * @param xTask The handle of the task to remove from the Blocked state.
+ *
+ * @return If the task referenced by xTask was not in the Blocked state then
+ * pdFAIL is returned.  Otherwise pdPASS is returned.
+ *
+ * \defgroup xTaskAbortDelay xTaskAbortDelay
+ * \ingroup TaskCtrl
+ */
+BaseType_t xTaskAbortDelay( TaskHandle_t xTask );
+
 /**
  * task. h
  * <pre>UBaseType_t uxTaskPriorityGet( TaskHandle_t xTask );</pre>

FreeRTOS/Source/portable/MemMang/ReadMe.url

@@ -0,0 +1,5 @@
+[{000214A0-0000-0000-C000-000000000046}]
+Prop3=19,2
+[InternetShortcut]
+URL=http://www.freertos.org/a00111.html
+IDList=

FreeRTOS/Source/portable/readme.txt

@@ -3,11 +3,12 @@ components and are common to every port, and one or more files that are
 specific to a particular microcontroller and/or compiler.
 
 
-+ The FreeRTOS/Source/Portable/MemMang directory contains the three sample
++ The FreeRTOS/Source/Portable/MemMang directory contains the five sample
 memory allocators as described on the http://www.FreeRTOS.org WEB site.
 
 + The other directories each contain files specific to a particular
-microcontroller or compiler.
+microcontroller or compiler, where the directory name denotes the compiler
+specific files the directory contains.
 
 
 

FreeRTOS/Source/queue.c

@@ -303,7 +303,7 @@ Queue_t * const pxQueue = ( Queue_t * ) xQueue;
 			it will be possible to write to it. */
 			if( listLIST_IS_EMPTY( &( pxQueue->xTasksWaitingToSend ) ) == pdFALSE )
 			{
-				if( xTaskRemoveFromEventList( &( pxQueue->xTasksWaitingToSend ) ) == pdTRUE )
+				if( xTaskRemoveFromEventList( &( pxQueue->xTasksWaitingToSend ) ) != pdFALSE )
 				{
 					queueYIELD_IF_USING_PREEMPTION();
 				}
@@ -651,7 +651,7 @@ Queue_t *pxNewQueue;
 			/* pdPASS will only be returned if the mutex was successfully
 			obtained.  The calling task may have entered the Blocked state
 			before reaching here. */
-			if( xReturn == pdPASS )
+			if( xReturn != pdFAIL )
 			{
 				( pxMutex->u.uxRecursiveCallCount )++;
 			}
@@ -732,7 +732,7 @@ Queue_t * const pxQueue = ( Queue_t * ) xQueue;
 				{
 					if( pxQueue->pxQueueSetContainer != NULL )
 					{
-						if( prvNotifyQueueSetContainer( pxQueue, xCopyPosition ) == pdTRUE )
+						if( prvNotifyQueueSetContainer( pxQueue, xCopyPosition ) != pdFALSE )
 						{
 							/* The queue is a member of a queue set, and posting
 							to the queue set caused a higher priority task to
@@ -750,7 +750,7 @@ Queue_t * const pxQueue = ( Queue_t * ) xQueue;
 						queue then unblock it now. */
 						if( listLIST_IS_EMPTY( &( pxQueue->xTasksWaitingToReceive ) ) == pdFALSE )
 						{
-							if( xTaskRemoveFromEventList( &( pxQueue->xTasksWaitingToReceive ) ) == pdTRUE )
+							if( xTaskRemoveFromEventList( &( pxQueue->xTasksWaitingToReceive ) ) != pdFALSE )
 							{
 								/* The unblocked task has a priority higher than
 								our own so yield immediately.  Yes it is ok to
@@ -783,7 +783,7 @@ Queue_t * const pxQueue = ( Queue_t * ) xQueue;
 					queue then unblock it now. */
 					if( listLIST_IS_EMPTY( &( pxQueue->xTasksWaitingToReceive ) ) == pdFALSE )
 					{
-						if( xTaskRemoveFromEventList( &( pxQueue->xTasksWaitingToReceive ) ) == pdTRUE )
+						if( xTaskRemoveFromEventList( &( pxQueue->xTasksWaitingToReceive ) ) != pdFALSE )
 						{
 							/* The unblocked task has a priority higher than
 							our own so yield immediately.  Yes it is ok to do
@@ -920,7 +920,7 @@ Queue_t * const pxQueue = ( Queue_t * ) xQueue;
 					queue then unblock it now. */
 					if( listLIST_IS_EMPTY( &( pxQueue->xTasksWaitingToReceive ) ) == pdFALSE )
 					{
-						if( xTaskRemoveFromEventList( &( pxQueue->xTasksWaitingToReceive ) ) == pdTRUE )
+						if( xTaskRemoveFromEventList( &( pxQueue->xTasksWaitingToReceive ) ) != pdFALSE )
 						{
 							/* The unblocked task has a priority higher than
 							our own so yield immediately. */
@@ -1031,7 +1031,7 @@ Queue_t * const pxQueue = ( Queue_t * ) xQueue;
 
 						if( listLIST_IS_EMPTY( &( pxQueue->xTasksWaitingToSend ) ) == pdFALSE )
 						{
-							if( xTaskRemoveFromEventList( &( pxQueue->xTasksWaitingToSend ) ) == pdTRUE )
+							if( xTaskRemoveFromEventList( &( pxQueue->xTasksWaitingToSend ) ) != pdFALSE )
 							{
 								portYIELD_WITHIN_API();
 							}
@@ -1191,7 +1191,7 @@ Queue_t * const pxQueue = ( Queue_t * ) xQueue;
 				{
 					if( pxQueue->pxQueueSetContainer != NULL )
 					{
-						if( prvNotifyQueueSetContainer( pxQueue, xCopyPosition ) == pdTRUE )
+						if( prvNotifyQueueSetContainer( pxQueue, xCopyPosition ) != pdFALSE )
 						{
 							/* The queue is a member of a queue set, and posting
 							to the queue set caused a higher priority task to
@@ -1352,7 +1352,7 @@ Queue_t * const pxQueue = ( Queue_t * ) xQueue;
 				{
 					if( pxQueue->pxQueueSetContainer != NULL )
 					{
-						if( prvNotifyQueueSetContainer( pxQueue, queueSEND_TO_BACK ) == pdTRUE )
+						if( prvNotifyQueueSetContainer( pxQueue, queueSEND_TO_BACK ) != pdFALSE )
 						{
 							/* The semaphore is a member of a queue set, and
 							posting	to the queue set caused a higher priority
@@ -1506,7 +1506,7 @@ Queue_t * const pxQueue = ( Queue_t * ) xQueue;
 
 					if( listLIST_IS_EMPTY( &( pxQueue->xTasksWaitingToSend ) ) == pdFALSE )
 					{
-						if( xTaskRemoveFromEventList( &( pxQueue->xTasksWaitingToSend ) ) == pdTRUE )
+						if( xTaskRemoveFromEventList( &( pxQueue->xTasksWaitingToSend ) ) != pdFALSE )
 						{
 							queueYIELD_IF_USING_PREEMPTION();
 						}
@@ -2019,7 +2019,7 @@ static void prvUnlockQueue( Queue_t * const pxQueue )
 			{
 				if( pxQueue->pxQueueSetContainer != NULL )
 				{
-					if( prvNotifyQueueSetContainer( pxQueue, queueSEND_TO_BACK ) == pdTRUE )
+					if( prvNotifyQueueSetContainer( pxQueue, queueSEND_TO_BACK ) != pdFALSE )
 					{
 						/* The queue is a member of a queue set, and posting to
 						the queue set caused a higher priority task to unblock.
@@ -2033,8 +2033,9 @@ static void prvUnlockQueue( Queue_t * const pxQueue )
 				}
 				else
 				{
-					/* Tasks that are removed from the event list will get added to
+					/* Tasks that are removed from the event list will get
-					the pending ready list as the scheduler is still suspended. */
+					added to the pending ready list as the scheduler is still
+					suspended. */
 					if( listLIST_IS_EMPTY( &( pxQueue->xTasksWaitingToReceive ) ) == pdFALSE )
 					{
 						if( xTaskRemoveFromEventList( &( pxQueue->xTasksWaitingToReceive ) ) != pdFALSE )

FreeRTOS/Source/tasks.c

@@ -203,6 +203,10 @@ typedef struct tskTaskControlBlock
 		uint8_t	ucStaticAllocationFlags; /* Set to pdTRUE if the stack is a statically allocated array, and pdFALSE if the stack is dynamically allocated. */
 	#endif
 
+	#if( INCLUDE_xTaskAbortDelay == 1 )
+		uint8_t ucDelayAborted;
+	#endif
+
 } tskTCB;
 
 /* The old tskTCB name is maintained above then typedefed to the new TCB_t name
@@ -210,8 +214,8 @@ below to enable the use of older kernel aware debuggers. */
 typedef tskTCB TCB_t;
 
 /*
- * Some kernel aware debuggers require the data the debugger needs access to to
+ * Some kernel aware debuggers require the data the debugger needs access to be
- * be global, rather than file scope.
+ * global, rather than file scope.
  */
 #ifdef portREMOVE_STATIC_QUALIFIER
 	#define static
@@ -1244,7 +1248,7 @@ StackType_t *pxTopOfStack;
 					mtCOVERAGE_TEST_MARKER();
 				}
 
-				if( xYieldRequired == pdTRUE )
+				if( xYieldRequired != pdFALSE )
 				{
 					taskYIELD_IF_USING_PREEMPTION();
 				}
@@ -1415,7 +1419,7 @@ StackType_t *pxTopOfStack;
 		{
 			taskENTER_CRITICAL();
 			{
-				if( prvTaskIsTaskSuspended( pxTCB ) == pdTRUE )
+				if( prvTaskIsTaskSuspended( pxTCB ) != pdFALSE )
 				{
 					traceTASK_RESUME( pxTCB );
 
@@ -1484,7 +1488,7 @@ StackType_t *pxTopOfStack;
 
 		uxSavedInterruptStatus = portSET_INTERRUPT_MASK_FROM_ISR();
 		{
-			if( prvTaskIsTaskSuspended( pxTCB ) == pdTRUE )
+			if( prvTaskIsTaskSuspended( pxTCB ) != pdFALSE )
 			{
 				traceTASK_RESUME_FROM_ISR( pxTCB );
 
@@ -1769,7 +1773,7 @@ BaseType_t xAlreadyYielded = pdFALSE;
 					mtCOVERAGE_TEST_MARKER();
 				}
 
-				if( xYieldPending == pdTRUE )
+				if( xYieldPending != pdFALSE )
 				{
 					#if( configUSE_PREEMPTION != 0 )
 					{
@@ -1933,6 +1937,9 @@ UBaseType_t uxTaskGetNumberOfTasks( void )
 	UBaseType_t uxQueue = configMAX_PRIORITIES;
 	TCB_t* pxTCB;
 
+		/* Task names will be truncated to configMAX_TASK_NAME_LEN - 1 bytes. */
+		configASSERT( strlen( pcNameToQuery ) < configMAX_TASK_NAME_LEN );
+
 		vTaskSuspendAll();
 		{
 			/* Search the ready lists. */
@@ -2094,6 +2101,80 @@ implementations require configUSE_TICKLESS_IDLE to be set to a value other than
 #endif /* configUSE_TICKLESS_IDLE */
 /*----------------------------------------------------------*/
 
+#if ( INCLUDE_xTaskAbortDelay == 1 )
+
+	BaseType_t xTaskAbortDelay( TaskHandle_t xTask )
+	{
+	TCB_t *pxTCB = ( TCB_t * ) xTask;
+	BaseType_t xReturn = pdFALSE;
+
+		configASSERT( pxTCB );
+
+		vTaskSuspendAll();
+		{
+			/* A task can only be prematurely removed from the Blocked state if
+			it is actually in the Blocked state. */
+			if( eTaskGetState( xTask ) == eBlocked )
+			{
+				/* Remove the reference to the task from the blocked list.  An
+				interrupt won't touch the xGenericListItem because the
+				scheduler is suspended. */
+				( void ) uxListRemove( &( pxTCB->xGenericListItem ) );
+
+				/* Is the task waiting on an event also?  If so remove it from
+				the event list too.  Interrupts can touch the event list item,
+				even though the scheduler is suspended, so a critical section
+				is used. */
+				taskENTER_CRITICAL();
+				{
+					if( listLIST_ITEM_CONTAINER( &( pxTCB->xEventListItem ) ) != NULL )
+					{
+						( void ) uxListRemove( &( pxTCB->xEventListItem ) );
+						pxTCB->ucDelayAborted = pdTRUE;
+					}
+					else
+					{
+						mtCOVERAGE_TEST_MARKER();
+					}
+				}
+				taskEXIT_CRITICAL();
+
+				/* Place the unblocked task into the appropriate ready list. */
+				prvAddTaskToReadyList( pxTCB );
+
+				/* A task being unblocked cannot cause an immediate context
+				switch if preemption is turned off. */
+				#if (  configUSE_PREEMPTION == 1 )
+				{
+					/* Preemption is on, but a context switch should only be
+					performed if the unblocked task has a priority that is
+					equal to or higher than the currently executing task. */
+					if( pxTCB->uxPriority > pxCurrentTCB->uxPriority )
+					{
+						/* Pend the yield to be performed when the scheduler
+						is unsuspended. */
+						xYieldPending = pdTRUE;
+					}
+					else
+					{
+						mtCOVERAGE_TEST_MARKER();
+					}
+				}
+				#endif /* configUSE_PREEMPTION */
+			}
+			else
+			{
+				mtCOVERAGE_TEST_MARKER();
+			}
+		}
+		xTaskResumeAll();
+
+		return xReturn;
+	}
+
+#endif /* INCLUDE_xTaskAbortDelay */
+/*----------------------------------------------------------*/
+
 BaseType_t xTaskIncrementTick( void )
 {
 TCB_t * pxTCB;
@@ -2479,7 +2560,7 @@ void vTaskPlaceOnUnorderedEventList( List_t * pxEventList, const TickType_t xIte
 		/* If the task should block indefinitely then set the block time to a
 		value that will be recognised as an indefinite delay inside the
 		prvAddCurrentTaskToDelayedList() function. */
-		if( xWaitIndefinitely == pdTRUE )
+		if( xWaitIndefinitely != pdFALSE )
 		{
 			xTicksToWait = portMAX_DELAY;
 		}
@@ -2624,15 +2705,26 @@ BaseType_t xReturn;
 		/* Minor optimisation.  The tick count cannot change in this block. */
 		const TickType_t xConstTickCount = xTickCount;
 
+		#if( INCLUDE_xTaskAbortDelay == 1 )
+			if( pxCurrentTCB->ucDelayAborted != pdFALSE )
+			{
+				/* The delay was aborted, which is not the same as a time out,
+				but has the same result. */
+				pxCurrentTCB->ucDelayAborted = pdFALSE;
+				xReturn = pdTRUE;
+			}
+			else
+		#endif
+
 		#if ( INCLUDE_vTaskSuspend == 1 )
-			/* If INCLUDE_vTaskSuspend is set to 1 and the block time specified
-			is the maximum block time then the task should block indefinitely,
-			and therefore never time out. */
 			if( *pxTicksToWait == portMAX_DELAY )
 			{
+				/* If INCLUDE_vTaskSuspend is set to 1 and the block time
+				specified is the maximum block time then the task should block
+				indefinitely, and therefore never time out. */
 				xReturn = pdFALSE;
 			}
-			else /* We are not blocking indefinitely, perform the checks below. */
+			else
 		#endif
 
 		if( ( xNumOfOverflows != pxTimeOut->xOverflowCount ) && ( xConstTickCount >= pxTimeOut->xTimeOnEntering ) ) /*lint !e525 Indentation preferred as is to make code within pre-processor directives clearer. */
@@ -2644,7 +2736,7 @@ BaseType_t xReturn;
 			was called. */
 			xReturn = pdTRUE;
 		}
-		else if( ( ( TickType_t ) ( xConstTickCount - pxTimeOut->xTimeOnEntering ) ) < *pxTicksToWait )
+		else if( ( ( TickType_t ) ( xConstTickCount - pxTimeOut->xTimeOnEntering ) ) < *pxTicksToWait ) /*lint !e961 Explicit casting is only redundant with some compilers, whereas others require it to prevent integer conversion errors. */
 		{
 			/* Not a genuine timeout. Adjust parameters for time remaining. */
 			*pxTicksToWait -= ( xConstTickCount - pxTimeOut->xTimeOnEntering );
@@ -2971,6 +3063,12 @@ UBaseType_t x;
 		_REENT_INIT_PTR( ( &( pxTCB->xNewLib_reent ) ) );
 	}
 	#endif
+
+	#if( INCLUDE_xTaskAbortDelay == 1 )
+	{
+		pxTCB->ucDelayAborted = pdFALSE;
+	}
+	#endif
 }
 /*-----------------------------------------------------------*/
 
@@ -4499,10 +4597,19 @@ TickType_t uxReturn;
 /*-----------------------------------------------------------*/
 
 
-static void prvAddCurrentTaskToDelayedList( TickType_t xTicksToWait, BaseType_t xCanBlockIndefinitely )
+static void prvAddCurrentTaskToDelayedList( TickType_t xTicksToWait, const BaseType_t xCanBlockIndefinitely )
 {
 TickType_t xTimeToWake;
 
+	#if( INCLUDE_xTaskAbortDelay == 1 )
+	{
+		/* About to enter a delayed list, so ensure the ucDelayAborted flag is
+		reset to pdFALSE so it can be detected as having been set to pdTRUE
+		when the task leaves the Blocked state. */
+		pxCurrentTCB->ucDelayAborted = pdFALSE;
+	}
+	#endif
+
 	/* Remove the task from the ready list before adding it to the blocked list
 	as the same list item is used for both lists. */
 	if( uxListRemove( &( pxCurrentTCB->xGenericListItem ) ) == ( UBaseType_t ) 0 )

FreeRTOS/Source/timers.c

@@ -454,7 +454,7 @@ Timer_t * const pxTimer = ( Timer_t * ) listGET_OWNER_OF_HEAD_ENTRY( pxCurrentTi
 		/* The timer is inserted into a list using a time relative to anything
 		other than the current time.  It will therefore be inserted into the
 		correct list relative to the time this task thinks it is now. */
-		if( prvInsertTimerInActiveList( pxTimer, ( xNextExpireTime + pxTimer->xTimerPeriodInTicks ), xTimeNow, xNextExpireTime ) == pdTRUE )
+		if( prvInsertTimerInActiveList( pxTimer, ( xNextExpireTime + pxTimer->xTimerPeriodInTicks ), xTimeNow, xNextExpireTime ) != pdFALSE )
 		{
 			/* The timer expired before it was added to the active timer
 			list.  Reload it now.  */
@@ -730,7 +730,7 @@ TickType_t xTimeNow;
 			    case tmrCOMMAND_RESET_FROM_ISR :
 				case tmrCOMMAND_START_DONT_TRACE :
 					/* Start or restart a timer. */
-					if( prvInsertTimerInActiveList( pxTimer,  xMessage.u.xTimerParameters.xMessageValue + pxTimer->xTimerPeriodInTicks, xTimeNow, xMessage.u.xTimerParameters.xMessageValue ) == pdTRUE )
+					if( prvInsertTimerInActiveList( pxTimer,  xMessage.u.xTimerParameters.xMessageValue + pxTimer->xTimerPeriodInTicks, xTimeNow, xMessage.u.xTimerParameters.xMessageValue ) != pdFALSE )
 					{
 						/* The timer expired before it was added to the active
 						timer list.  Process it now. */