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205 lines
9.0 KiB
C
205 lines
9.0 KiB
C
/*
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FreeRTOS V8.0.1 - Copyright (C) 2014 Real Time Engineers Ltd.
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All rights reserved
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VISIT http://www.FreeRTOS.org TO ENSURE YOU ARE USING THE LATEST VERSION.
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***************************************************************************
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* *
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* FreeRTOS provides completely free yet professionally developed, *
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* robust, strictly quality controlled, supported, and cross *
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* platform software that has become a de facto standard. *
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* *
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* Help yourself get started quickly and support the FreeRTOS *
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* project by purchasing a FreeRTOS tutorial book, reference *
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* manual, or both from: http://www.FreeRTOS.org/Documentation *
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* *
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* Thank you! *
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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 modification to the GPL is included to allow you to !<<
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>>! distribute a combined work that includes FreeRTOS without being !<<
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>>! obliged to provide the source code for proprietary components !<<
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>>! outside of the FreeRTOS kernel. !<<
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FreeRTOS is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. Full license text is available from the following
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link: http://www.freertos.org/a00114.html
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1 tab == 4 spaces!
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***************************************************************************
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* *
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* Having a problem? Start by reading the FAQ "My application does *
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* not run, what could be wrong?" *
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* *
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* http://www.FreeRTOS.org/FAQHelp.html *
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* *
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***************************************************************************
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http://www.FreeRTOS.org - Documentation, books, training, latest versions,
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license and Real Time Engineers Ltd. contact details.
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http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products,
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including FreeRTOS+Trace - an indispensable productivity tool, a DOS
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compatible FAT file system, and our tiny thread aware UDP/IP stack.
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http://www.OpenRTOS.com - Real Time Engineers ltd license FreeRTOS to High
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Integrity Systems to sell under the OpenRTOS brand. Low cost OpenRTOS
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licenses offer ticketed support, indemnification and middleware.
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http://www.SafeRTOS.com - High Integrity Systems also provide a safety
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engineered and independently SIL3 certified version for use in safety and
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mission critical applications that require provable dependability.
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1 tab == 4 spaces!
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*/
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#include <stdlib.h>
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#include "FreeRTOS.h"
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#include "list.h"
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/*-----------------------------------------------------------
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* PUBLIC LIST API documented in list.h
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*----------------------------------------------------------*/
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void vListInitialise( List_t * const pxList )
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{
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/* The list structure contains a list item which is used to mark the
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end of the list. To initialise the list the list end is inserted
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as the only list entry. */
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pxList->pxIndex = ( ListItem_t * ) &( pxList->xListEnd ); /*lint !e826 !e740 The mini list structure is used as the list end to save RAM. This is checked and valid. */
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/* The list end value is the highest possible value in the list to
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ensure it remains at the end of the list. */
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pxList->xListEnd.xItemValue = portMAX_DELAY;
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/* The list end next and previous pointers point to itself so we know
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when the list is empty. */
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pxList->xListEnd.pxNext = ( ListItem_t * ) &( pxList->xListEnd ); /*lint !e826 !e740 The mini list structure is used as the list end to save RAM. This is checked and valid. */
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pxList->xListEnd.pxPrevious = ( ListItem_t * ) &( pxList->xListEnd );/*lint !e826 !e740 The mini list structure is used as the list end to save RAM. This is checked and valid. */
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pxList->uxNumberOfItems = ( UBaseType_t ) 0U;
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}
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/*-----------------------------------------------------------*/
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void vListInitialiseItem( ListItem_t * const pxItem )
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{
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/* Make sure the list item is not recorded as being on a list. */
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pxItem->pvContainer = NULL;
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}
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/*-----------------------------------------------------------*/
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void vListInsertEnd( List_t * const pxList, ListItem_t * const pxNewListItem )
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{
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ListItem_t * const pxIndex = pxList->pxIndex;
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/* Insert a new list item into pxList, but rather than sort the list,
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makes the new list item the last item to be removed by a call to
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listGET_OWNER_OF_NEXT_ENTRY(). */
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pxNewListItem->pxNext = pxIndex;
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pxNewListItem->pxPrevious = pxIndex->pxPrevious;
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pxIndex->pxPrevious->pxNext = pxNewListItem;
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pxIndex->pxPrevious = pxNewListItem;
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/* Remember which list the item is in. */
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pxNewListItem->pvContainer = ( void * ) pxList;
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( pxList->uxNumberOfItems )++;
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}
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/*-----------------------------------------------------------*/
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void vListInsert( List_t * const pxList, ListItem_t * const pxNewListItem )
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{
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ListItem_t *pxIterator;
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const TickType_t xValueOfInsertion = pxNewListItem->xItemValue;
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/* Insert the new list item into the list, sorted in xItemValue order.
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If the list already contains a list item with the same item value then
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the new list item should be placed after it. This ensures that TCB's which
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are stored in ready lists (all of which have the same xItemValue value)
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get an equal share of the CPU. However, if the xItemValue is the same as
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the back marker the iteration loop below will not end. This means we need
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to guard against this by checking the value first and modifying the
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algorithm slightly if necessary. */
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if( xValueOfInsertion == portMAX_DELAY )
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{
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pxIterator = pxList->xListEnd.pxPrevious;
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}
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else
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{
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/* *** NOTE ***********************************************************
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If you find your application is crashing here then likely causes are:
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1) Stack overflow -
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see http://www.freertos.org/Stacks-and-stack-overflow-checking.html
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2) Incorrect interrupt priority assignment, especially on Cortex-M3
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parts where numerically high priority values denote low actual
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interrupt priories, which can seem counter intuitive. See
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configMAX_SYSCALL_INTERRUPT_PRIORITY on http://www.freertos.org/a00110.html
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3) Calling an API function from within a critical section or when
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the scheduler is suspended, or calling an API function that does
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not end in "FromISR" from an interrupt.
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4) Using a queue or semaphore before it has been initialised or
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before the scheduler has been started (are interrupts firing
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before vTaskStartScheduler() has been called?).
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See http://www.freertos.org/FAQHelp.html for more tips, and ensure
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configASSERT() is defined! http://www.freertos.org/a00110.html#configASSERT
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**********************************************************************/
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for( pxIterator = ( ListItem_t * ) &( pxList->xListEnd ); pxIterator->pxNext->xItemValue <= xValueOfInsertion; pxIterator = pxIterator->pxNext ) /*lint !e826 !e740 The mini list structure is used as the list end to save RAM. This is checked and valid. */
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{
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/* There is nothing to do here, we are just iterating to the
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wanted insertion position. */
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}
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}
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pxNewListItem->pxNext = pxIterator->pxNext;
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pxNewListItem->pxNext->pxPrevious = pxNewListItem;
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pxNewListItem->pxPrevious = pxIterator;
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pxIterator->pxNext = pxNewListItem;
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/* Remember which list the item is in. This allows fast removal of the
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item later. */
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pxNewListItem->pvContainer = ( void * ) pxList;
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( pxList->uxNumberOfItems )++;
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}
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/*-----------------------------------------------------------*/
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UBaseType_t uxListRemove( ListItem_t * const pxItemToRemove )
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{
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/* The list item knows which list it is in. Obtain the list from the list
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item. */
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List_t * const pxList = ( List_t * ) pxItemToRemove->pvContainer;
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pxItemToRemove->pxNext->pxPrevious = pxItemToRemove->pxPrevious;
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pxItemToRemove->pxPrevious->pxNext = pxItemToRemove->pxNext;
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/* Make sure the index is left pointing to a valid item. */
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if( pxList->pxIndex == pxItemToRemove )
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{
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pxList->pxIndex = pxItemToRemove->pxPrevious;
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}
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else
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{
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mtCOVERAGE_TEST_MARKER();
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}
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pxItemToRemove->pvContainer = NULL;
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( pxList->uxNumberOfItems )--;
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return pxList->uxNumberOfItems;
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}
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/*-----------------------------------------------------------*/
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