/* FreeRTOS V7.5.2 - Copyright (C) 2013 Real Time Engineers Ltd. VISIT http://www.FreeRTOS.org TO ENSURE YOU ARE USING THE LATEST VERSION. *************************************************************************** * * * FreeRTOS provides completely free yet professionally developed, * * robust, strictly quality controlled, supported, and cross * * platform software that has become a de facto standard. * * * * Help yourself get started quickly and support the FreeRTOS * * project by purchasing a FreeRTOS tutorial book, reference * * manual, or both from: http://www.FreeRTOS.org/Documentation * * * * Thank you! * * * *************************************************************************** This file is part of the FreeRTOS distribution. FreeRTOS is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License (version 2) as published by the Free Software Foundation >>!AND MODIFIED BY!<< the FreeRTOS exception. >>! NOTE: The modification to the GPL is included to allow you to distribute >>! a combined work that includes FreeRTOS without being obliged to provide >>! the source code for proprietary components outside of the FreeRTOS >>! kernel. FreeRTOS is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. Full license text is available from the following link: http://www.freertos.org/a00114.html 1 tab == 4 spaces! *************************************************************************** * * * Having a problem? Start by reading the FAQ "My application does * * not run, what could be wrong?" * * * * http://www.FreeRTOS.org/FAQHelp.html * * * *************************************************************************** http://www.FreeRTOS.org - Documentation, books, training, latest versions, license and Real Time Engineers Ltd. contact details. http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products, including FreeRTOS+Trace - an indispensable productivity tool, a DOS compatible FAT file system, and our tiny thread aware UDP/IP stack. http://www.OpenRTOS.com - Real Time Engineers ltd license FreeRTOS to High Integrity Systems to sell under the OpenRTOS brand. Low cost OpenRTOS licenses offer ticketed support, indemnification and middleware. http://www.SafeRTOS.com - High Integrity Systems also provide a safety engineered and independently SIL3 certified version for use in safety and mission critical applications that require provable dependability. 1 tab == 4 spaces! */ #include #include "FreeRTOS.h" #include "list.h" /*----------------------------------------------------------- * PUBLIC LIST API documented in list.h *----------------------------------------------------------*/ void vListInitialise( xList * const pxList ) { /* The list structure contains a list item which is used to mark the end of the list. To initialise the list the list end is inserted as the only list entry. */ pxList->pxIndex = ( xListItem * ) &( pxList->xListEnd ); /*lint !e826 !e740 The mini list structure is used as the list end to save RAM. This is checked and valid. */ /* The list end value is the highest possible value in the list to ensure it remains at the end of the list. */ pxList->xListEnd.xItemValue = portMAX_DELAY; /* The list end next and previous pointers point to itself so we know when the list is empty. */ pxList->xListEnd.pxNext = ( xListItem * ) &( pxList->xListEnd ); /*lint !e826 !e740 The mini list structure is used as the list end to save RAM. This is checked and valid. */ pxList->xListEnd.pxPrevious = ( xListItem * ) &( pxList->xListEnd );/*lint !e826 !e740 The mini list structure is used as the list end to save RAM. This is checked and valid. */ pxList->uxNumberOfItems = ( unsigned portBASE_TYPE ) 0U; } /*-----------------------------------------------------------*/ void vListInitialiseItem( xListItem * const pxItem ) { /* Make sure the list item is not recorded as being on a list. */ pxItem->pvContainer = NULL; } /*-----------------------------------------------------------*/ void IRAM vListInsertEnd( xList * const pxList, xListItem * const pxNewListItem ) { xListItem * pxIndex; /* Insert a new list item into pxList, but rather than sort the list, makes the new list item the last item to be removed by a call to pvListGetOwnerOfNextEntry. */ pxIndex = pxList->pxIndex; pxNewListItem->pxNext = pxIndex; pxNewListItem->pxPrevious = pxIndex->pxPrevious; pxIndex->pxPrevious->pxNext = pxNewListItem; pxIndex->pxPrevious = pxNewListItem; /* Remember which list the item is in. */ pxNewListItem->pvContainer = ( void * ) pxList; ( pxList->uxNumberOfItems )++; } /*-----------------------------------------------------------*/ void IRAM vListInsert( xList * const pxList, xListItem * const pxNewListItem ) { xListItem *pxIterator; portTickType xValueOfInsertion; /* Insert the new list item into the list, sorted in ulListItem order. */ xValueOfInsertion = pxNewListItem->xItemValue; /* If the list already contains a list item with the same item value then the new list item should be placed after it. This ensures that TCB's which are stored in ready lists (all of which have the same ulListItem value) get an equal share of the CPU. However, if the xItemValue is the same as the back marker the iteration loop below will not end. This means we need to guard against this by checking the value first and modifying the algorithm slightly if necessary. */ if( xValueOfInsertion == portMAX_DELAY ) { pxIterator = pxList->xListEnd.pxPrevious; } else { /* *** NOTE *********************************************************** If you find your application is crashing here then likely causes are: 1) Stack overflow - see http://www.freertos.org/Stacks-and-stack-overflow-checking.html 2) Incorrect interrupt priority assignment, especially on Cortex-M3 parts where numerically high priority values denote low actual interrupt priories, which can seem counter intuitive. See configMAX_SYSCALL_INTERRUPT_PRIORITY on http://www.freertos.org/a00110.html 3) Calling an API function from within a critical section or when the scheduler is suspended, or calling an API function that does not end in "FromISR" from an interrupt. 4) Using a queue or semaphore before it has been initialised or before the scheduler has been started (are interrupts firing before vTaskStartScheduler() has been called?). See http://www.freertos.org/FAQHelp.html for more tips. **********************************************************************/ for( pxIterator = ( xListItem * ) &( 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. */ { /* There is nothing to do here, we are just iterating to the wanted insertion position. */ } } pxNewListItem->pxNext = pxIterator->pxNext; pxNewListItem->pxNext->pxPrevious = pxNewListItem; pxNewListItem->pxPrevious = pxIterator; pxIterator->pxNext = pxNewListItem; /* Remember which list the item is in. This allows fast removal of the item later. */ pxNewListItem->pvContainer = ( void * ) pxList; ( pxList->uxNumberOfItems )++; } /*-----------------------------------------------------------*/ unsigned portBASE_TYPE IRAM uxListRemove( xListItem * const pxItemToRemove ) { xList * pxList; pxItemToRemove->pxNext->pxPrevious = pxItemToRemove->pxPrevious; pxItemToRemove->pxPrevious->pxNext = pxItemToRemove->pxNext; /* The list item knows which list it is in. Obtain the list from the list item. */ pxList = ( xList * ) pxItemToRemove->pvContainer; /* Make sure the index is left pointing to a valid item. */ if( pxList->pxIndex == pxItemToRemove ) { pxList->pxIndex = pxItemToRemove->pxPrevious; } pxItemToRemove->pvContainer = NULL; ( pxList->uxNumberOfItems )--; return pxList->uxNumberOfItems; } /*-----------------------------------------------------------*/