Add in a couple of extra list macros for use with FreeRTOS+UDP.

Allow the ISR safe queue send and receive functions to set the higher priority task woken pointer to NULL.

Source/include/list.h

@@ -139,6 +139,15 @@ typedef struct xLIST
  */
 #define listSET_LIST_ITEM_OWNER( pxListItem, pxOwner )		( pxListItem )->pvOwner = ( void * ) ( pxOwner )
 
+/*
+ * Access macro to get the owner of a list item.  The owner of a list item
+ * is the object (usually a TCB) that contains the list item.
+ *
+ * \page listSET_LIST_ITEM_OWNER listSET_LIST_ITEM_OWNER
+ * \ingroup LinkedList
+ */
+#define listGET_LIST_ITEM_OWNER( pxListItem )		( pxListItem )->pvOwner
+
 /*
  * Access macro to set the value of the list item.  In most cases the value is
  * used to sort the list in descending order.
@@ -149,7 +158,7 @@ typedef struct xLIST
 #define listSET_LIST_ITEM_VALUE( pxListItem, xValue )		( pxListItem )->xItemValue = ( xValue )
 
 /*
- * Access macro the retrieve the value of the list item.  The value can
+ * Access macro to retrieve the value of the list item.  The value can
  * represent anything - for example a the priority of a task, or the time at
  * which a task should be unblocked.
  *
@@ -244,6 +253,13 @@ xList * const pxConstList = ( pxList );													\
  */
 #define listIS_CONTAINED_WITHIN( pxList, pxListItem ) ( ( pxListItem )->pvContainer == ( void * ) ( pxList ) )
 
+/*
+ * This provides a crude means of knowing if a list has been initialised, as
+ * pxList->xListEnd.xItemValue is set to portMAX_DELAY by the vListInitialise()
+ * function.
+ */
+#define listLIST_IS_INITIALISED( pxList ) ( ( pxList )->xListEnd.xItemValue == portMAX_DELAY )
+
 /*
  * Must be called before a list is used!  This initialises all the members
  * of the list structure and inserts the xListEnd item into the list as a

Source/include/queue.h

@@ -1187,10 +1187,10 @@ signed portBASE_TYPE xQueueGenericSendFromISR( xQueueHandle pxQueue, const void
  * \defgroup xQueueReceiveFromISR xQueueReceiveFromISR
  * \ingroup QueueManagement
  */
-signed portBASE_TYPE xQueueReceiveFromISR( xQueueHandle pxQueue, void * const pvBuffer, signed portBASE_TYPE *pxTaskWoken );
+signed portBASE_TYPE xQueueReceiveFromISR( xQueueHandle pxQueue, void * const pvBuffer, signed portBASE_TYPE *pxHigherPriorityTaskWoken );
 
 /*
- * Utilities to query queue that are safe to use from an ISR.  These utilities
+ * Utilities to query queues that are safe to use from an ISR.  These utilities
  * should be used only from witin an ISR, or within a critical section.
  */
 signed portBASE_TYPE xQueueIsQueueEmptyFromISR( const xQueueHandle pxQueue );

Source/queue.c

@@ -157,12 +157,12 @@ typedef xQUEUE * xQueueHandle;
  * functions are documented in the API header file.
  */
 xQueueHandle xQueueGenericCreate( unsigned portBASE_TYPE uxQueueLength, unsigned portBASE_TYPE uxItemSize, unsigned char ucQueueType ) PRIVILEGED_FUNCTION;
-signed portBASE_TYPE xQueueGenericSend( xQueueHandle xQueue, const void * const pvItemToQueue, portTickType xTicksToWait, portBASE_TYPE xCopyPosition ) PRIVILEGED_FUNCTION;
+signed portBASE_TYPE xQueueGenericSend( xQueueHandle pxQueue, const void * const pvItemToQueue, portTickType xTicksToWait, portBASE_TYPE xCopyPosition ) PRIVILEGED_FUNCTION;
 unsigned portBASE_TYPE uxQueueMessagesWaiting( const xQueueHandle pxQueue ) PRIVILEGED_FUNCTION;
 void vQueueDelete( xQueueHandle xQueue ) PRIVILEGED_FUNCTION;
 signed portBASE_TYPE xQueueGenericSendFromISR( xQueueHandle pxQueue, const void * const pvItemToQueue, signed portBASE_TYPE *pxHigherPriorityTaskWoken, portBASE_TYPE xCopyPosition ) PRIVILEGED_FUNCTION;
 signed portBASE_TYPE xQueueGenericReceive( xQueueHandle pxQueue, void * const pvBuffer, portTickType xTicksToWait, portBASE_TYPE xJustPeeking ) PRIVILEGED_FUNCTION;
-signed portBASE_TYPE xQueueReceiveFromISR( xQueueHandle pxQueue, void * const pvBuffer, signed portBASE_TYPE *pxTaskWoken ) PRIVILEGED_FUNCTION;
+signed portBASE_TYPE xQueueReceiveFromISR( xQueueHandle pxQueue, void * const pvBuffer, signed portBASE_TYPE *pxHigherPriorityTaskWoken ) PRIVILEGED_FUNCTION;
 xQueueHandle xQueueCreateMutex( unsigned char ucQueueType ) PRIVILEGED_FUNCTION;
 xQueueHandle xQueueCreateCountingSemaphore( unsigned portBASE_TYPE uxCountValue, unsigned portBASE_TYPE uxInitialCount ) PRIVILEGED_FUNCTION;
 portBASE_TYPE xQueueTakeMutexRecursive( xQueueHandle xMutex, portTickType xBlockTime ) PRIVILEGED_FUNCTION;
@@ -905,7 +905,6 @@ signed portBASE_TYPE xReturn;
 unsigned portBASE_TYPE uxSavedInterruptStatus;
 
 	configASSERT( pxQueue );
-	configASSERT( pxHigherPriorityTaskWoken );
 	configASSERT( !( ( pvItemToQueue == NULL ) && ( pxQueue->uxItemSize != ( unsigned portBASE_TYPE ) 0U ) ) );
 
 	/* Similar to xQueueGenericSend, except we don't block if there is no room
@@ -931,7 +930,10 @@ unsigned portBASE_TYPE uxSavedInterruptStatus;
 					{
 						/* The task waiting has a higher priority so record that a
 						context	switch is required. */
-						*pxHigherPriorityTaskWoken = pdTRUE;
+						if( pxHigherPriorityTaskWoken != NULL )
+						{
+							*pxHigherPriorityTaskWoken = pdTRUE;
+						}
 					}
 				}
 			}
@@ -1105,13 +1107,12 @@ signed char *pcOriginalReadPosition;
 }
 /*-----------------------------------------------------------*/
 
-signed portBASE_TYPE xQueueReceiveFromISR( xQueueHandle pxQueue, void * const pvBuffer, signed portBASE_TYPE *pxTaskWoken )
+signed portBASE_TYPE xQueueReceiveFromISR( xQueueHandle pxQueue, void * const pvBuffer, signed portBASE_TYPE *pxHigherPriorityTaskWoken )
 {
 signed portBASE_TYPE xReturn;
 unsigned portBASE_TYPE uxSavedInterruptStatus;
 
 	configASSERT( pxQueue );
-	configASSERT( pxTaskWoken );
 	configASSERT( !( ( pvBuffer == NULL ) && ( pxQueue->uxItemSize != ( unsigned portBASE_TYPE ) 0U ) ) );
 
 	uxSavedInterruptStatus = portSET_INTERRUPT_MASK_FROM_ISR();
@@ -1135,7 +1136,10 @@ unsigned portBASE_TYPE uxSavedInterruptStatus;
 					{
 						/* The task waiting has a higher priority than us so
 						force a context switch. */
-						*pxTaskWoken = pdTRUE;
+						if( pxHigherPriorityTaskWoken != NULL )
+						{
+							*pxHigherPriorityTaskWoken = pdTRUE;
+						}
 					}
 				}
 			}