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306 lines
13 KiB
C
306 lines
13 KiB
C
/*
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FreeRTOS V6.0.0 - Copyright (C) 2009 Real Time Engineers Ltd.
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***************************************************************************
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* *
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* If you are: *
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* *
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* + New to FreeRTOS, *
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* + Wanting to learn FreeRTOS or multitasking in general quickly *
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* + Looking for basic training, *
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* + Wanting to improve your FreeRTOS skills and productivity *
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* *
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* then take a look at the FreeRTOS eBook *
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* *
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* "Using the FreeRTOS Real Time Kernel - a Practical Guide" *
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* http://www.FreeRTOS.org/Documentation *
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* *
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* A pdf reference manual is also available. Both are usually delivered *
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* to your inbox within 20 minutes to two hours when purchased between 8am *
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* and 8pm GMT (although please allow up to 24 hours in case of *
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* exceptional circumstances). Thank you for your support! *
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* *
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***************************************************************************
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This file is part of the FreeRTOS distribution.
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FreeRTOS is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License (version 2) as published by the
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Free Software Foundation AND MODIFIED BY the FreeRTOS exception.
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***NOTE*** The exception to the GPL is included to allow you to distribute
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a combined work that includes FreeRTOS without being obliged to provide the
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source code for proprietary components outside of the FreeRTOS kernel.
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FreeRTOS is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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more details. You should have received a copy of the GNU General Public
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License and the FreeRTOS license exception along with FreeRTOS; if not it
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can be viewed here: http://www.freertos.org/a00114.html and also obtained
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by writing to Richard Barry, contact details for whom are available on the
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FreeRTOS WEB site.
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1 tab == 4 spaces!
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http://www.FreeRTOS.org - Documentation, latest information, license and
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contact details.
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http://www.SafeRTOS.com - A version that is certified for use in safety
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critical systems.
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http://www.OpenRTOS.com - Commercial support, development, porting,
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licensing and training services.
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*/
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/*
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* This is the list implementation used by the scheduler. While it is tailored
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* heavily for the schedulers needs, it is also available for use by
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* application code.
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*
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* xLists can only store pointers to xListItems. Each xListItem contains a
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* numeric value (xItemValue). Most of the time the lists are sorted in
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* descending item value order.
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*
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* Lists are created already containing one list item. The value of this
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* item is the maximum possible that can be stored, it is therefore always at
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* the end of the list and acts as a marker. The list member pxHead always
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* points to this marker - even though it is at the tail of the list. This
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* is because the tail contains a wrap back pointer to the true head of
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* the list.
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*
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* In addition to it's value, each list item contains a pointer to the next
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* item in the list (pxNext), a pointer to the list it is in (pxContainer)
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* and a pointer to back to the object that contains it. These later two
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* pointers are included for efficiency of list manipulation. There is
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* effectively a two way link between the object containing the list item and
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* the list item itself.
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*
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*
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* \page ListIntroduction List Implementation
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* \ingroup FreeRTOSIntro
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*/
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/*
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Changes from V4.3.1
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+ Included local const within listGET_OWNER_OF_NEXT_ENTRY() to assist
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compiler with optimisation. Thanks B.R.
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*/
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#ifndef LIST_H
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#define LIST_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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/*
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* Definition of the only type of object that a list can contain.
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*/
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struct xLIST_ITEM
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{
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portTickType xItemValue; /*< The value being listed. In most cases this is used to sort the list in descending order. */
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volatile struct xLIST_ITEM * pxNext; /*< Pointer to the next xListItem in the list. */
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volatile struct xLIST_ITEM * pxPrevious;/*< Pointer to the previous xListItem in the list. */
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void * pvOwner; /*< Pointer to the object (normally a TCB) that contains the list item. There is therefore a two way link between the object containing the list item and the list item itself. */
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void * pvContainer; /*< Pointer to the list in which this list item is placed (if any). */
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};
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typedef struct xLIST_ITEM xListItem; /* For some reason lint wants this as two separate definitions. */
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struct xMINI_LIST_ITEM
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{
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portTickType xItemValue;
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volatile struct xLIST_ITEM *pxNext;
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volatile struct xLIST_ITEM *pxPrevious;
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};
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typedef struct xMINI_LIST_ITEM xMiniListItem;
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/*
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* Definition of the type of queue used by the scheduler.
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*/
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typedef struct xLIST
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{
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volatile unsigned portBASE_TYPE uxNumberOfItems;
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volatile xListItem * pxIndex; /*< Used to walk through the list. Points to the last item returned by a call to pvListGetOwnerOfNextEntry (). */
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volatile xMiniListItem xListEnd; /*< List item that contains the maximum possible item value meaning it is always at the end of the list and is therefore used as a marker. */
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} xList;
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/*
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* Access macro to set the owner of a list item. The owner of a list item
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* is the object (usually a TCB) that contains the list item.
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*
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* \page listSET_LIST_ITEM_OWNER listSET_LIST_ITEM_OWNER
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* \ingroup LinkedList
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*/
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#define listSET_LIST_ITEM_OWNER( pxListItem, pxOwner ) ( pxListItem )->pvOwner = ( void * ) pxOwner
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/*
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* Access macro to set the value of the list item. In most cases the value is
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* used to sort the list in descending order.
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*
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* \page listSET_LIST_ITEM_VALUE listSET_LIST_ITEM_VALUE
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* \ingroup LinkedList
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*/
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#define listSET_LIST_ITEM_VALUE( pxListItem, xValue ) ( pxListItem )->xItemValue = xValue
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/*
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* Access macro the retrieve the value of the list item. The value can
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* represent anything - for example a the priority of a task, or the time at
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* which a task should be unblocked.
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*
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* \page listGET_LIST_ITEM_VALUE listGET_LIST_ITEM_VALUE
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* \ingroup LinkedList
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*/
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#define listGET_LIST_ITEM_VALUE( pxListItem ) ( ( pxListItem )->xItemValue )
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/*
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* Access macro to determine if a list contains any items. The macro will
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* only have the value true if the list is empty.
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*
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* \page listLIST_IS_EMPTY listLIST_IS_EMPTY
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* \ingroup LinkedList
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*/
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#define listLIST_IS_EMPTY( pxList ) ( ( pxList )->uxNumberOfItems == ( unsigned portBASE_TYPE ) 0 )
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/*
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* Access macro to return the number of items in the list.
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*/
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#define listCURRENT_LIST_LENGTH( pxList ) ( ( pxList )->uxNumberOfItems )
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/*
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* Access function to obtain the owner of the next entry in a list.
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*
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* The list member pxIndex is used to walk through a list. Calling
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* listGET_OWNER_OF_NEXT_ENTRY increments pxIndex to the next item in the list
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* and returns that entries pxOwner parameter. Using multiple calls to this
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* function it is therefore possible to move through every item contained in
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* a list.
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*
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* The pxOwner parameter of a list item is a pointer to the object that owns
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* the list item. In the scheduler this is normally a task control block.
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* The pxOwner parameter effectively creates a two way link between the list
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* item and its owner.
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*
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* @param pxList The list from which the next item owner is to be returned.
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*
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* \page listGET_OWNER_OF_NEXT_ENTRY listGET_OWNER_OF_NEXT_ENTRY
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* \ingroup LinkedList
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*/
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#define listGET_OWNER_OF_NEXT_ENTRY( pxTCB, pxList ) \
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{ \
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xList * const pxConstList = pxList; \
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/* Increment the index to the next item and return the item, ensuring */ \
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/* we don't return the marker used at the end of the list. */ \
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( pxConstList )->pxIndex = ( pxConstList )->pxIndex->pxNext; \
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if( ( pxConstList )->pxIndex == ( xListItem * ) &( ( pxConstList )->xListEnd ) ) \
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{ \
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( pxConstList )->pxIndex = ( pxConstList )->pxIndex->pxNext; \
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} \
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pxTCB = ( pxConstList )->pxIndex->pvOwner; \
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}
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/*
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* Access function to obtain the owner of the first entry in a list. Lists
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* are normally sorted in ascending item value order.
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*
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* This function returns the pxOwner member of the first item in the list.
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* The pxOwner parameter of a list item is a pointer to the object that owns
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* the list item. In the scheduler this is normally a task control block.
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* The pxOwner parameter effectively creates a two way link between the list
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* item and its owner.
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*
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* @param pxList The list from which the owner of the head item is to be
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* returned.
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*
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* \page listGET_OWNER_OF_HEAD_ENTRY listGET_OWNER_OF_HEAD_ENTRY
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* \ingroup LinkedList
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*/
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#define listGET_OWNER_OF_HEAD_ENTRY( pxList ) ( ( pxList->uxNumberOfItems != ( unsigned portBASE_TYPE ) 0 ) ? ( (&( pxList->xListEnd ))->pxNext->pvOwner ) : ( NULL ) )
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/*
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* Check to see if a list item is within a list. The list item maintains a
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* "container" pointer that points to the list it is in. All this macro does
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* is check to see if the container and the list match.
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*
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* @param pxList The list we want to know if the list item is within.
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* @param pxListItem The list item we want to know if is in the list.
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* @return pdTRUE is the list item is in the list, otherwise pdFALSE.
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* pointer against
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*/
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#define listIS_CONTAINED_WITHIN( pxList, pxListItem ) ( ( pxListItem )->pvContainer == ( void * ) pxList )
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/*
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* Must be called before a list is used! This initialises all the members
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* of the list structure and inserts the xListEnd item into the list as a
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* marker to the back of the list.
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*
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* @param pxList Pointer to the list being initialised.
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*
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* \page vListInitialise vListInitialise
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* \ingroup LinkedList
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*/
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void vListInitialise( xList *pxList );
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/*
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* Must be called before a list item is used. This sets the list container to
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* null so the item does not think that it is already contained in a list.
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*
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* @param pxItem Pointer to the list item being initialised.
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*
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* \page vListInitialiseItem vListInitialiseItem
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* \ingroup LinkedList
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*/
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void vListInitialiseItem( xListItem *pxItem );
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/*
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* Insert a list item into a list. The item will be inserted into the list in
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* a position determined by its item value (descending item value order).
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*
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* @param pxList The list into which the item is to be inserted.
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*
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* @param pxNewListItem The item to that is to be placed in the list.
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*
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* \page vListInsert vListInsert
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* \ingroup LinkedList
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*/
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void vListInsert( xList *pxList, xListItem *pxNewListItem );
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/*
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* Insert a list item into a list. The item will be inserted in a position
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* such that it will be the last item within the list returned by multiple
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* calls to listGET_OWNER_OF_NEXT_ENTRY.
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*
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* The list member pvIndex is used to walk through a list. Calling
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* listGET_OWNER_OF_NEXT_ENTRY increments pvIndex to the next item in the list.
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* Placing an item in a list using vListInsertEnd effectively places the item
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* in the list position pointed to by pvIndex. This means that every other
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* item within the list will be returned by listGET_OWNER_OF_NEXT_ENTRY before
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* the pvIndex parameter again points to the item being inserted.
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*
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* @param pxList The list into which the item is to be inserted.
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*
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* @param pxNewListItem The list item to be inserted into the list.
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*
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* \page vListInsertEnd vListInsertEnd
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* \ingroup LinkedList
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*/
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void vListInsertEnd( xList *pxList, xListItem *pxNewListItem );
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/*
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* Remove an item from a list. The list item has a pointer to the list that
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* it is in, so only the list item need be passed into the function.
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*
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* @param vListRemove The item to be removed. The item will remove itself from
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* the list pointed to by it's pxContainer parameter.
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*
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* \page vListRemove vListRemove
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* \ingroup LinkedList
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*/
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void vListRemove( xListItem *pxItemToRemove );
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#ifdef __cplusplus
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}
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#endif
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#endif
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