1687 lines
54 KiB
C
1687 lines
54 KiB
C
/*
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FreeRTOS V7.3.0 - Copyright (C) 2012 Real Time Engineers Ltd.
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FEATURES AND PORTS ARE ADDED TO FREERTOS ALL THE TIME. PLEASE VISIT
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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 tutorial books are available in pdf and paperback. *
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* Complete, revised, and edited pdf reference manuals are also *
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* available. *
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* *
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* Purchasing FreeRTOS documentation will not only help you, by *
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* ensuring you get running as quickly as possible and with an *
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* in-depth knowledge of how to use FreeRTOS, it will also help *
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* the FreeRTOS project to continue with its mission of providing *
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* professional grade, cross platform, de facto standard solutions *
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* for microcontrollers - completely free of charge! *
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* *
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* >>> See http://www.FreeRTOS.org/Documentation for details. <<< *
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* *
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* Thank you for using FreeRTOS, and 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 modification to the GPL is included to allow you to
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distribute a combined work that includes FreeRTOS without being obliged to
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provide the source code for proprietary components outside of the FreeRTOS
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kernel. FreeRTOS is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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or 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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***************************************************************************
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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, training, latest versions, license
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and 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.
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Real Time Engineers ltd license FreeRTOS to High Integrity Systems, who sell
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the code with commercial support, indemnification, and middleware, under
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the OpenRTOS brand: http://www.OpenRTOS.com. High Integrity Systems also
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provide a safety engineered and independently SIL3 certified version under
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the SafeRTOS brand: http://www.SafeRTOS.com.
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*/
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#include <stdlib.h>
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#include <string.h>
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/* Defining MPU_WRAPPERS_INCLUDED_FROM_API_FILE prevents task.h from redefining
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all the API functions to use the MPU wrappers. That should only be done when
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task.h is included from an application file. */
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#define MPU_WRAPPERS_INCLUDED_FROM_API_FILE
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#include "FreeRTOS.h"
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#include "task.h"
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#if ( configUSE_CO_ROUTINES == 1 )
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#include "croutine.h"
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#endif
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#undef MPU_WRAPPERS_INCLUDED_FROM_API_FILE
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/*-----------------------------------------------------------
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* PUBLIC LIST API documented in list.h
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*----------------------------------------------------------*/
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/* Constants used with the cRxLock and xTxLock structure members. */
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#define queueUNLOCKED ( ( signed portBASE_TYPE ) -1 )
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#define queueLOCKED_UNMODIFIED ( ( signed portBASE_TYPE ) 0 )
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#define queueERRONEOUS_UNBLOCK ( -1 )
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/* For internal use only. */
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#define queueSEND_TO_BACK ( 0 )
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#define queueSEND_TO_FRONT ( 1 )
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/* Effectively make a union out of the xQUEUE structure. */
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#define pxMutexHolder pcTail
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#define uxQueueType pcHead
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#define uxRecursiveCallCount pcReadFrom
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#define queueQUEUE_IS_MUTEX NULL
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/* Semaphores do not actually store or copy data, so have an items size of
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zero. */
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#define queueSEMAPHORE_QUEUE_ITEM_LENGTH ( ( unsigned portBASE_TYPE ) 0 )
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#define queueDONT_BLOCK ( ( portTickType ) 0U )
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#define queueMUTEX_GIVE_BLOCK_TIME ( ( portTickType ) 0U )
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/* These definitions *must* match those in queue.h. */
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#define queueQUEUE_TYPE_BASE ( 0U )
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#define queueQUEUE_TYPE_MUTEX ( 1U )
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#define queueQUEUE_TYPE_COUNTING_SEMAPHORE ( 2U )
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#define queueQUEUE_TYPE_BINARY_SEMAPHORE ( 3U )
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#define queueQUEUE_TYPE_RECURSIVE_MUTEX ( 4U )
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/*
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* Definition of the queue used by the scheduler.
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* Items are queued by copy, not reference.
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*/
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typedef struct QueueDefinition
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{
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signed char *pcHead; /*< Points to the beginning of the queue storage area. */
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signed char *pcTail; /*< Points to the byte at the end of the queue storage area. Once more byte is allocated than necessary to store the queue items, this is used as a marker. */
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signed char *pcWriteTo; /*< Points to the free next place in the storage area. */
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signed char *pcReadFrom; /*< Points to the last place that a queued item was read from. */
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xList xTasksWaitingToSend; /*< List of tasks that are blocked waiting to post onto this queue. Stored in priority order. */
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xList xTasksWaitingToReceive; /*< List of tasks that are blocked waiting to read from this queue. Stored in priority order. */
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volatile unsigned portBASE_TYPE uxMessagesWaiting;/*< The number of items currently in the queue. */
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unsigned portBASE_TYPE uxLength; /*< The length of the queue defined as the number of items it will hold, not the number of bytes. */
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unsigned portBASE_TYPE uxItemSize; /*< The size of each items that the queue will hold. */
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volatile signed portBASE_TYPE xRxLock; /*< Stores the number of items received from the queue (removed from the queue) while the queue was locked. Set to queueUNLOCKED when the queue is not locked. */
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volatile signed portBASE_TYPE xTxLock; /*< Stores the number of items transmitted to the queue (added to the queue) while the queue was locked. Set to queueUNLOCKED when the queue is not locked. */
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#if ( configUSE_TRACE_FACILITY == 1 )
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unsigned char ucQueueNumber;
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unsigned char ucQueueType;
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#endif
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} xQUEUE;
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/*-----------------------------------------------------------*/
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/*
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* Inside this file xQueueHandle is a pointer to a xQUEUE structure.
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* To keep the definition private the API header file defines it as a
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* pointer to void.
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*/
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typedef xQUEUE * xQueueHandle;
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/*
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* Prototypes for public functions are included here so we don't have to
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* include the API header file (as it defines xQueueHandle differently). These
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* functions are documented in the API header file.
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*/
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xQueueHandle xQueueGenericCreate( unsigned portBASE_TYPE uxQueueLength, unsigned portBASE_TYPE uxItemSize, unsigned char ucQueueType ) PRIVILEGED_FUNCTION;
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signed portBASE_TYPE xQueueGenericSend( xQueueHandle pxQueue, const void * const pvItemToQueue, portTickType xTicksToWait, portBASE_TYPE xCopyPosition ) PRIVILEGED_FUNCTION;
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unsigned portBASE_TYPE uxQueueMessagesWaiting( const xQueueHandle pxQueue ) PRIVILEGED_FUNCTION;
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void vQueueDelete( xQueueHandle xQueue ) PRIVILEGED_FUNCTION;
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signed portBASE_TYPE xQueueGenericSendFromISR( xQueueHandle pxQueue, const void * const pvItemToQueue, signed portBASE_TYPE *pxHigherPriorityTaskWoken, portBASE_TYPE xCopyPosition ) PRIVILEGED_FUNCTION;
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signed portBASE_TYPE xQueueGenericReceive( xQueueHandle pxQueue, void * const pvBuffer, portTickType xTicksToWait, portBASE_TYPE xJustPeeking ) PRIVILEGED_FUNCTION;
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signed portBASE_TYPE xQueueReceiveFromISR( xQueueHandle pxQueue, void * const pvBuffer, signed portBASE_TYPE *pxHigherPriorityTaskWoken ) PRIVILEGED_FUNCTION;
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xQueueHandle xQueueCreateMutex( unsigned char ucQueueType ) PRIVILEGED_FUNCTION;
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xQueueHandle xQueueCreateCountingSemaphore( unsigned portBASE_TYPE uxCountValue, unsigned portBASE_TYPE uxInitialCount ) PRIVILEGED_FUNCTION;
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portBASE_TYPE xQueueTakeMutexRecursive( xQueueHandle xMutex, portTickType xBlockTime ) PRIVILEGED_FUNCTION;
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portBASE_TYPE xQueueGiveMutexRecursive( xQueueHandle xMutex ) PRIVILEGED_FUNCTION;
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signed portBASE_TYPE xQueueAltGenericSend( xQueueHandle pxQueue, const void * const pvItemToQueue, portTickType xTicksToWait, portBASE_TYPE xCopyPosition ) PRIVILEGED_FUNCTION;
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signed portBASE_TYPE xQueueAltGenericReceive( xQueueHandle pxQueue, void * const pvBuffer, portTickType xTicksToWait, portBASE_TYPE xJustPeeking ) PRIVILEGED_FUNCTION;
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signed portBASE_TYPE xQueueIsQueueEmptyFromISR( const xQueueHandle pxQueue ) PRIVILEGED_FUNCTION;
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signed portBASE_TYPE xQueueIsQueueFullFromISR( const xQueueHandle pxQueue ) PRIVILEGED_FUNCTION;
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unsigned portBASE_TYPE uxQueueMessagesWaitingFromISR( const xQueueHandle pxQueue ) PRIVILEGED_FUNCTION;
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void vQueueWaitForMessageRestricted( xQueueHandle pxQueue, portTickType xTicksToWait ) PRIVILEGED_FUNCTION;
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unsigned char ucQueueGetQueueNumber( xQueueHandle pxQueue ) PRIVILEGED_FUNCTION;
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void vQueueSetQueueNumber( xQueueHandle pxQueue, unsigned char ucQueueNumber ) PRIVILEGED_FUNCTION;
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unsigned char ucQueueGetQueueType( xQueueHandle pxQueue ) PRIVILEGED_FUNCTION;
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portBASE_TYPE xQueueGenericReset( xQueueHandle pxQueue, portBASE_TYPE xNewQueue ) PRIVILEGED_FUNCTION;
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xTaskHandle xQueueGetMutexHolder( xQueueHandle xSemaphore ) PRIVILEGED_FUNCTION;
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/*
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* Co-routine queue functions differ from task queue functions. Co-routines are
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* an optional component.
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*/
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#if configUSE_CO_ROUTINES == 1
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signed portBASE_TYPE xQueueCRSendFromISR( xQueueHandle pxQueue, const void *pvItemToQueue, signed portBASE_TYPE xCoRoutinePreviouslyWoken ) PRIVILEGED_FUNCTION;
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signed portBASE_TYPE xQueueCRReceiveFromISR( xQueueHandle pxQueue, void *pvBuffer, signed portBASE_TYPE *pxTaskWoken ) PRIVILEGED_FUNCTION;
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signed portBASE_TYPE xQueueCRSend( xQueueHandle pxQueue, const void *pvItemToQueue, portTickType xTicksToWait ) PRIVILEGED_FUNCTION;
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signed portBASE_TYPE xQueueCRReceive( xQueueHandle pxQueue, void *pvBuffer, portTickType xTicksToWait ) PRIVILEGED_FUNCTION;
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#endif
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/*
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* The queue registry is just a means for kernel aware debuggers to locate
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* queue structures. It has no other purpose so is an optional component.
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*/
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#if configQUEUE_REGISTRY_SIZE > 0
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/* The type stored within the queue registry array. This allows a name
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to be assigned to each queue making kernel aware debugging a little
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more user friendly. */
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typedef struct QUEUE_REGISTRY_ITEM
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{
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signed char *pcQueueName;
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xQueueHandle xHandle;
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} xQueueRegistryItem;
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/* The queue registry is simply an array of xQueueRegistryItem structures.
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The pcQueueName member of a structure being NULL is indicative of the
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array position being vacant. */
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xQueueRegistryItem xQueueRegistry[ configQUEUE_REGISTRY_SIZE ];
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/* Removes a queue from the registry by simply setting the pcQueueName
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member to NULL. */
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static void vQueueUnregisterQueue( xQueueHandle xQueue ) PRIVILEGED_FUNCTION;
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void vQueueAddToRegistry( xQueueHandle xQueue, signed char *pcQueueName ) PRIVILEGED_FUNCTION;
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#endif
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/*
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* Unlocks a queue locked by a call to prvLockQueue. Locking a queue does not
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* prevent an ISR from adding or removing items to the queue, but does prevent
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* an ISR from removing tasks from the queue event lists. If an ISR finds a
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* queue is locked it will instead increment the appropriate queue lock count
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* to indicate that a task may require unblocking. When the queue in unlocked
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* these lock counts are inspected, and the appropriate action taken.
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*/
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static void prvUnlockQueue( xQueueHandle pxQueue ) PRIVILEGED_FUNCTION;
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/*
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* Uses a critical section to determine if there is any data in a queue.
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*
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* @return pdTRUE if the queue contains no items, otherwise pdFALSE.
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*/
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static signed portBASE_TYPE prvIsQueueEmpty( const xQueueHandle pxQueue ) PRIVILEGED_FUNCTION;
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/*
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* Uses a critical section to determine if there is any space in a queue.
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*
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* @return pdTRUE if there is no space, otherwise pdFALSE;
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*/
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static signed portBASE_TYPE prvIsQueueFull( const xQueueHandle pxQueue ) PRIVILEGED_FUNCTION;
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/*
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* Copies an item into the queue, either at the front of the queue or the
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* back of the queue.
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*/
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static void prvCopyDataToQueue( xQUEUE *pxQueue, const void *pvItemToQueue, portBASE_TYPE xPosition ) PRIVILEGED_FUNCTION;
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/*
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* Copies an item out of a queue.
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*/
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static void prvCopyDataFromQueue( xQUEUE * const pxQueue, const void *pvBuffer ) PRIVILEGED_FUNCTION;
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/*-----------------------------------------------------------*/
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/*
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* Macro to mark a queue as locked. Locking a queue prevents an ISR from
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* accessing the queue event lists.
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*/
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#define prvLockQueue( pxQueue ) \
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taskENTER_CRITICAL(); \
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{ \
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if( ( pxQueue )->xRxLock == queueUNLOCKED ) \
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{ \
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( pxQueue )->xRxLock = queueLOCKED_UNMODIFIED; \
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} \
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if( ( pxQueue )->xTxLock == queueUNLOCKED ) \
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{ \
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( pxQueue )->xTxLock = queueLOCKED_UNMODIFIED; \
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} \
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} \
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taskEXIT_CRITICAL()
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/*-----------------------------------------------------------*/
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/*-----------------------------------------------------------
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* PUBLIC QUEUE MANAGEMENT API documented in queue.h
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*----------------------------------------------------------*/
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portBASE_TYPE xQueueGenericReset( xQueueHandle pxQueue, portBASE_TYPE xNewQueue )
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{
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configASSERT( pxQueue );
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taskENTER_CRITICAL();
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{
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pxQueue->pcTail = pxQueue->pcHead + ( pxQueue->uxLength * pxQueue->uxItemSize );
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pxQueue->uxMessagesWaiting = ( unsigned portBASE_TYPE ) 0U;
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pxQueue->pcWriteTo = pxQueue->pcHead;
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pxQueue->pcReadFrom = pxQueue->pcHead + ( ( pxQueue->uxLength - ( unsigned portBASE_TYPE ) 1U ) * pxQueue->uxItemSize );
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pxQueue->xRxLock = queueUNLOCKED;
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pxQueue->xTxLock = queueUNLOCKED;
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if( xNewQueue == pdFALSE )
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{
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/* If there are tasks blocked waiting to read from the queue, then
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the tasks will remain blocked as after this function exits the queue
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will still be empty. If there are tasks blocked waiting to write to
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the queue, then one should be unblocked as after this function exits
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it will be possible to write to it. */
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if( listLIST_IS_EMPTY( &( pxQueue->xTasksWaitingToSend ) ) == pdFALSE )
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{
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if( xTaskRemoveFromEventList( &( pxQueue->xTasksWaitingToSend ) ) == pdTRUE )
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{
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portYIELD_WITHIN_API();
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}
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}
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}
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else
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{
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/* Ensure the event queues start in the correct state. */
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vListInitialise( &( pxQueue->xTasksWaitingToSend ) );
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vListInitialise( &( pxQueue->xTasksWaitingToReceive ) );
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}
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}
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taskEXIT_CRITICAL();
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/* A value is returned for calling semantic consistency with previous
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versions. */
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return pdPASS;
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}
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/*-----------------------------------------------------------*/
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xQueueHandle xQueueGenericCreate( unsigned portBASE_TYPE uxQueueLength, unsigned portBASE_TYPE uxItemSize, unsigned char ucQueueType )
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{
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xQUEUE *pxNewQueue;
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size_t xQueueSizeInBytes;
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xQueueHandle xReturn = NULL;
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/* Remove compiler warnings about unused parameters should
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configUSE_TRACE_FACILITY not be set to 1. */
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( void ) ucQueueType;
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/* Allocate the new queue structure. */
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if( uxQueueLength > ( unsigned portBASE_TYPE ) 0 )
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{
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pxNewQueue = ( xQUEUE * ) pvPortMalloc( sizeof( xQUEUE ) );
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if( pxNewQueue != NULL )
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{
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/* Create the list of pointers to queue items. The queue is one byte
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longer than asked for to make wrap checking easier/faster. */
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xQueueSizeInBytes = ( size_t ) ( uxQueueLength * uxItemSize ) + ( size_t ) 1;
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pxNewQueue->pcHead = ( signed char * ) pvPortMalloc( xQueueSizeInBytes );
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if( pxNewQueue->pcHead != NULL )
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{
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/* Initialise the queue members as described above where the
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queue type is defined. */
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pxNewQueue->uxLength = uxQueueLength;
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pxNewQueue->uxItemSize = uxItemSize;
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xQueueGenericReset( pxNewQueue, pdTRUE );
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#if ( configUSE_TRACE_FACILITY == 1 )
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{
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pxNewQueue->ucQueueType = ucQueueType;
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}
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#endif /* configUSE_TRACE_FACILITY */
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traceQUEUE_CREATE( pxNewQueue );
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xReturn = pxNewQueue;
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}
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else
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{
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traceQUEUE_CREATE_FAILED( ucQueueType );
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vPortFree( pxNewQueue );
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}
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}
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}
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configASSERT( xReturn );
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return xReturn;
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}
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/*-----------------------------------------------------------*/
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#if ( configUSE_MUTEXES == 1 )
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xQueueHandle xQueueCreateMutex( unsigned char ucQueueType )
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{
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xQUEUE *pxNewQueue;
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|
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/* Prevent compiler warnings about unused parameters if
|
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configUSE_TRACE_FACILITY does not equal 1. */
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( void ) ucQueueType;
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|
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/* Allocate the new queue structure. */
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pxNewQueue = ( xQUEUE * ) pvPortMalloc( sizeof( xQUEUE ) );
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if( pxNewQueue != NULL )
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{
|
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/* Information required for priority inheritance. */
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pxNewQueue->pxMutexHolder = NULL;
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pxNewQueue->uxQueueType = queueQUEUE_IS_MUTEX;
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/* Queues used as a mutex no data is actually copied into or out
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of the queue. */
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pxNewQueue->pcWriteTo = NULL;
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pxNewQueue->pcReadFrom = NULL;
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/* Each mutex has a length of 1 (like a binary semaphore) and
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an item size of 0 as nothing is actually copied into or out
|
|
of the mutex. */
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pxNewQueue->uxMessagesWaiting = ( unsigned portBASE_TYPE ) 0U;
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pxNewQueue->uxLength = ( unsigned portBASE_TYPE ) 1U;
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pxNewQueue->uxItemSize = ( unsigned portBASE_TYPE ) 0U;
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pxNewQueue->xRxLock = queueUNLOCKED;
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pxNewQueue->xTxLock = queueUNLOCKED;
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#if ( configUSE_TRACE_FACILITY == 1 )
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{
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pxNewQueue->ucQueueType = ucQueueType;
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}
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#endif
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/* Ensure the event queues start with the correct state. */
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vListInitialise( &( pxNewQueue->xTasksWaitingToSend ) );
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vListInitialise( &( pxNewQueue->xTasksWaitingToReceive ) );
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traceCREATE_MUTEX( pxNewQueue );
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/* Start with the semaphore in the expected state. */
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xQueueGenericSend( pxNewQueue, NULL, ( portTickType ) 0U, queueSEND_TO_BACK );
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}
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else
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{
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traceCREATE_MUTEX_FAILED();
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}
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|
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configASSERT( pxNewQueue );
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return pxNewQueue;
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}
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|
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#endif /* configUSE_MUTEXES */
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/*-----------------------------------------------------------*/
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#if ( ( configUSE_MUTEXES == 1 ) && ( INCLUDE_xQueueGetMutexHolder == 1 ) )
|
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|
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void* xQueueGetMutexHolder( xQueueHandle xSemaphore )
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|
{
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void *pxReturn;
|
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|
|
/* This function is called by xSemaphoreGetMutexHolder(), and should not
|
|
be called directly. Note: This is is a good way of determining if the
|
|
calling task is the mutex holder, but not a good way of determining the
|
|
identity of the mutex holder, as the holder may change between the
|
|
following critical section exiting and the function returning. */
|
|
taskENTER_CRITICAL();
|
|
{
|
|
if( xSemaphore->uxQueueType == queueQUEUE_IS_MUTEX )
|
|
{
|
|
pxReturn = ( void * ) xSemaphore->pxMutexHolder;
|
|
}
|
|
else
|
|
{
|
|
pxReturn = NULL;
|
|
}
|
|
}
|
|
taskEXIT_CRITICAL();
|
|
|
|
return pxReturn;
|
|
}
|
|
|
|
#endif
|
|
/*-----------------------------------------------------------*/
|
|
|
|
#if ( configUSE_RECURSIVE_MUTEXES == 1 )
|
|
|
|
portBASE_TYPE xQueueGiveMutexRecursive( xQueueHandle pxMutex )
|
|
{
|
|
portBASE_TYPE xReturn;
|
|
|
|
configASSERT( pxMutex );
|
|
|
|
/* If this is the task that holds the mutex then pxMutexHolder will not
|
|
change outside of this task. If this task does not hold the mutex then
|
|
pxMutexHolder can never coincidentally equal the tasks handle, and as
|
|
this is the only condition we are interested in it does not matter if
|
|
pxMutexHolder is accessed simultaneously by another task. Therefore no
|
|
mutual exclusion is required to test the pxMutexHolder variable. */
|
|
if( pxMutex->pxMutexHolder == xTaskGetCurrentTaskHandle() )
|
|
{
|
|
traceGIVE_MUTEX_RECURSIVE( pxMutex );
|
|
|
|
/* uxRecursiveCallCount cannot be zero if pxMutexHolder is equal to
|
|
the task handle, therefore no underflow check is required. Also,
|
|
uxRecursiveCallCount is only modified by the mutex holder, and as
|
|
there can only be one, no mutual exclusion is required to modify the
|
|
uxRecursiveCallCount member. */
|
|
( pxMutex->uxRecursiveCallCount )--;
|
|
|
|
/* Have we unwound the call count? */
|
|
if( pxMutex->uxRecursiveCallCount == 0 )
|
|
{
|
|
/* Return the mutex. This will automatically unblock any other
|
|
task that might be waiting to access the mutex. */
|
|
xQueueGenericSend( pxMutex, NULL, queueMUTEX_GIVE_BLOCK_TIME, queueSEND_TO_BACK );
|
|
}
|
|
|
|
xReturn = pdPASS;
|
|
}
|
|
else
|
|
{
|
|
/* We cannot give the mutex because we are not the holder. */
|
|
xReturn = pdFAIL;
|
|
|
|
traceGIVE_MUTEX_RECURSIVE_FAILED( pxMutex );
|
|
}
|
|
|
|
return xReturn;
|
|
}
|
|
|
|
#endif /* configUSE_RECURSIVE_MUTEXES */
|
|
/*-----------------------------------------------------------*/
|
|
|
|
#if configUSE_RECURSIVE_MUTEXES == 1
|
|
|
|
portBASE_TYPE xQueueTakeMutexRecursive( xQueueHandle pxMutex, portTickType xBlockTime )
|
|
{
|
|
portBASE_TYPE xReturn;
|
|
|
|
configASSERT( pxMutex );
|
|
|
|
/* Comments regarding mutual exclusion as per those within
|
|
xQueueGiveMutexRecursive(). */
|
|
|
|
traceTAKE_MUTEX_RECURSIVE( pxMutex );
|
|
|
|
if( pxMutex->pxMutexHolder == xTaskGetCurrentTaskHandle() )
|
|
{
|
|
( pxMutex->uxRecursiveCallCount )++;
|
|
xReturn = pdPASS;
|
|
}
|
|
else
|
|
{
|
|
xReturn = xQueueGenericReceive( pxMutex, NULL, xBlockTime, pdFALSE );
|
|
|
|
/* pdPASS will only be returned if we successfully obtained the mutex,
|
|
we may have blocked to reach here. */
|
|
if( xReturn == pdPASS )
|
|
{
|
|
( pxMutex->uxRecursiveCallCount )++;
|
|
}
|
|
else
|
|
{
|
|
traceTAKE_MUTEX_RECURSIVE_FAILED( pxMutex );
|
|
}
|
|
}
|
|
|
|
return xReturn;
|
|
}
|
|
|
|
#endif /* configUSE_RECURSIVE_MUTEXES */
|
|
/*-----------------------------------------------------------*/
|
|
|
|
#if configUSE_COUNTING_SEMAPHORES == 1
|
|
|
|
xQueueHandle xQueueCreateCountingSemaphore( unsigned portBASE_TYPE uxCountValue, unsigned portBASE_TYPE uxInitialCount )
|
|
{
|
|
xQueueHandle pxHandle;
|
|
|
|
pxHandle = xQueueGenericCreate( ( unsigned portBASE_TYPE ) uxCountValue, queueSEMAPHORE_QUEUE_ITEM_LENGTH, queueQUEUE_TYPE_COUNTING_SEMAPHORE );
|
|
|
|
if( pxHandle != NULL )
|
|
{
|
|
pxHandle->uxMessagesWaiting = uxInitialCount;
|
|
|
|
traceCREATE_COUNTING_SEMAPHORE();
|
|
}
|
|
else
|
|
{
|
|
traceCREATE_COUNTING_SEMAPHORE_FAILED();
|
|
}
|
|
|
|
configASSERT( pxHandle );
|
|
return pxHandle;
|
|
}
|
|
|
|
#endif /* configUSE_COUNTING_SEMAPHORES */
|
|
/*-----------------------------------------------------------*/
|
|
|
|
signed portBASE_TYPE xQueueGenericSend( xQueueHandle pxQueue, const void * const pvItemToQueue, portTickType xTicksToWait, portBASE_TYPE xCopyPosition )
|
|
{
|
|
signed portBASE_TYPE xEntryTimeSet = pdFALSE;
|
|
xTimeOutType xTimeOut;
|
|
|
|
configASSERT( pxQueue );
|
|
configASSERT( !( ( pvItemToQueue == NULL ) && ( pxQueue->uxItemSize != ( unsigned portBASE_TYPE ) 0U ) ) );
|
|
|
|
/* This function relaxes the coding standard somewhat to allow return
|
|
statements within the function itself. This is done in the interest
|
|
of execution time efficiency. */
|
|
for( ;; )
|
|
{
|
|
taskENTER_CRITICAL();
|
|
{
|
|
/* Is there room on the queue now? To be running we must be
|
|
the highest priority task wanting to access the queue. */
|
|
if( pxQueue->uxMessagesWaiting < pxQueue->uxLength )
|
|
{
|
|
traceQUEUE_SEND( pxQueue );
|
|
prvCopyDataToQueue( pxQueue, pvItemToQueue, xCopyPosition );
|
|
|
|
/* If there was a task waiting for data to arrive on the
|
|
queue then unblock it now. */
|
|
if( listLIST_IS_EMPTY( &( pxQueue->xTasksWaitingToReceive ) ) == pdFALSE )
|
|
{
|
|
if( xTaskRemoveFromEventList( &( pxQueue->xTasksWaitingToReceive ) ) == pdTRUE )
|
|
{
|
|
/* The unblocked task has a priority higher than
|
|
our own so yield immediately. Yes it is ok to do
|
|
this from within the critical section - the kernel
|
|
takes care of that. */
|
|
portYIELD_WITHIN_API();
|
|
}
|
|
}
|
|
|
|
taskEXIT_CRITICAL();
|
|
|
|
/* Return to the original privilege level before exiting the
|
|
function. */
|
|
return pdPASS;
|
|
}
|
|
else
|
|
{
|
|
if( xTicksToWait == ( portTickType ) 0 )
|
|
{
|
|
/* The queue was full and no block time is specified (or
|
|
the block time has expired) so leave now. */
|
|
taskEXIT_CRITICAL();
|
|
|
|
/* Return to the original privilege level before exiting
|
|
the function. */
|
|
traceQUEUE_SEND_FAILED( pxQueue );
|
|
return errQUEUE_FULL;
|
|
}
|
|
else if( xEntryTimeSet == pdFALSE )
|
|
{
|
|
/* The queue was full and a block time was specified so
|
|
configure the timeout structure. */
|
|
vTaskSetTimeOutState( &xTimeOut );
|
|
xEntryTimeSet = pdTRUE;
|
|
}
|
|
}
|
|
}
|
|
taskEXIT_CRITICAL();
|
|
|
|
/* Interrupts and other tasks can send to and receive from the queue
|
|
now the critical section has been exited. */
|
|
|
|
vTaskSuspendAll();
|
|
prvLockQueue( pxQueue );
|
|
|
|
/* Update the timeout state to see if it has expired yet. */
|
|
if( xTaskCheckForTimeOut( &xTimeOut, &xTicksToWait ) == pdFALSE )
|
|
{
|
|
if( prvIsQueueFull( pxQueue ) != pdFALSE )
|
|
{
|
|
traceBLOCKING_ON_QUEUE_SEND( pxQueue );
|
|
vTaskPlaceOnEventList( &( pxQueue->xTasksWaitingToSend ), xTicksToWait );
|
|
|
|
/* Unlocking the queue means queue events can effect the
|
|
event list. It is possible that interrupts occurring now
|
|
remove this task from the event list again - but as the
|
|
scheduler is suspended the task will go onto the pending
|
|
ready last instead of the actual ready list. */
|
|
prvUnlockQueue( pxQueue );
|
|
|
|
/* Resuming the scheduler will move tasks from the pending
|
|
ready list into the ready list - so it is feasible that this
|
|
task is already in a ready list before it yields - in which
|
|
case the yield will not cause a context switch unless there
|
|
is also a higher priority task in the pending ready list. */
|
|
if( xTaskResumeAll() == pdFALSE )
|
|
{
|
|
portYIELD_WITHIN_API();
|
|
}
|
|
}
|
|
else
|
|
{
|
|
/* Try again. */
|
|
prvUnlockQueue( pxQueue );
|
|
( void ) xTaskResumeAll();
|
|
}
|
|
}
|
|
else
|
|
{
|
|
/* The timeout has expired. */
|
|
prvUnlockQueue( pxQueue );
|
|
( void ) xTaskResumeAll();
|
|
|
|
/* Return to the original privilege level before exiting the
|
|
function. */
|
|
traceQUEUE_SEND_FAILED( pxQueue );
|
|
return errQUEUE_FULL;
|
|
}
|
|
}
|
|
}
|
|
/*-----------------------------------------------------------*/
|
|
|
|
#if configUSE_ALTERNATIVE_API == 1
|
|
|
|
signed portBASE_TYPE xQueueAltGenericSend( xQueueHandle pxQueue, const void * const pvItemToQueue, portTickType xTicksToWait, portBASE_TYPE xCopyPosition )
|
|
{
|
|
signed portBASE_TYPE xEntryTimeSet = pdFALSE;
|
|
xTimeOutType xTimeOut;
|
|
|
|
configASSERT( pxQueue );
|
|
configASSERT( !( ( pvItemToQueue == NULL ) && ( pxQueue->uxItemSize != ( unsigned portBASE_TYPE ) 0U ) ) );
|
|
|
|
for( ;; )
|
|
{
|
|
taskENTER_CRITICAL();
|
|
{
|
|
/* Is there room on the queue now? To be running we must be
|
|
the highest priority task wanting to access the queue. */
|
|
if( pxQueue->uxMessagesWaiting < pxQueue->uxLength )
|
|
{
|
|
traceQUEUE_SEND( pxQueue );
|
|
prvCopyDataToQueue( pxQueue, pvItemToQueue, xCopyPosition );
|
|
|
|
/* If there was a task waiting for data to arrive on the
|
|
queue then unblock it now. */
|
|
if( listLIST_IS_EMPTY( &( pxQueue->xTasksWaitingToReceive ) ) == pdFALSE )
|
|
{
|
|
if( xTaskRemoveFromEventList( &( pxQueue->xTasksWaitingToReceive ) ) == pdTRUE )
|
|
{
|
|
/* The unblocked task has a priority higher than
|
|
our own so yield immediately. */
|
|
portYIELD_WITHIN_API();
|
|
}
|
|
}
|
|
|
|
taskEXIT_CRITICAL();
|
|
return pdPASS;
|
|
}
|
|
else
|
|
{
|
|
if( xTicksToWait == ( portTickType ) 0 )
|
|
{
|
|
taskEXIT_CRITICAL();
|
|
return errQUEUE_FULL;
|
|
}
|
|
else if( xEntryTimeSet == pdFALSE )
|
|
{
|
|
vTaskSetTimeOutState( &xTimeOut );
|
|
xEntryTimeSet = pdTRUE;
|
|
}
|
|
}
|
|
}
|
|
taskEXIT_CRITICAL();
|
|
|
|
taskENTER_CRITICAL();
|
|
{
|
|
if( xTaskCheckForTimeOut( &xTimeOut, &xTicksToWait ) == pdFALSE )
|
|
{
|
|
if( prvIsQueueFull( pxQueue ) != pdFALSE )
|
|
{
|
|
traceBLOCKING_ON_QUEUE_SEND( pxQueue );
|
|
vTaskPlaceOnEventList( &( pxQueue->xTasksWaitingToSend ), xTicksToWait );
|
|
portYIELD_WITHIN_API();
|
|
}
|
|
}
|
|
else
|
|
{
|
|
taskEXIT_CRITICAL();
|
|
traceQUEUE_SEND_FAILED( pxQueue );
|
|
return errQUEUE_FULL;
|
|
}
|
|
}
|
|
taskEXIT_CRITICAL();
|
|
}
|
|
}
|
|
|
|
#endif /* configUSE_ALTERNATIVE_API */
|
|
/*-----------------------------------------------------------*/
|
|
|
|
#if configUSE_ALTERNATIVE_API == 1
|
|
|
|
signed portBASE_TYPE xQueueAltGenericReceive( xQueueHandle pxQueue, void * const pvBuffer, portTickType xTicksToWait, portBASE_TYPE xJustPeeking )
|
|
{
|
|
signed portBASE_TYPE xEntryTimeSet = pdFALSE;
|
|
xTimeOutType xTimeOut;
|
|
signed char *pcOriginalReadPosition;
|
|
|
|
configASSERT( pxQueue );
|
|
configASSERT( !( ( pvBuffer == NULL ) && ( pxQueue->uxItemSize != ( unsigned portBASE_TYPE ) 0U ) ) );
|
|
|
|
for( ;; )
|
|
{
|
|
taskENTER_CRITICAL();
|
|
{
|
|
if( pxQueue->uxMessagesWaiting > ( unsigned portBASE_TYPE ) 0 )
|
|
{
|
|
/* Remember our read position in case we are just peeking. */
|
|
pcOriginalReadPosition = pxQueue->pcReadFrom;
|
|
|
|
prvCopyDataFromQueue( pxQueue, pvBuffer );
|
|
|
|
if( xJustPeeking == pdFALSE )
|
|
{
|
|
traceQUEUE_RECEIVE( pxQueue );
|
|
|
|
/* We are actually removing data. */
|
|
--( pxQueue->uxMessagesWaiting );
|
|
|
|
#if ( configUSE_MUTEXES == 1 )
|
|
{
|
|
if( pxQueue->uxQueueType == queueQUEUE_IS_MUTEX )
|
|
{
|
|
/* Record the information required to implement
|
|
priority inheritance should it become necessary. */
|
|
pxQueue->pxMutexHolder = xTaskGetCurrentTaskHandle();
|
|
}
|
|
}
|
|
#endif
|
|
|
|
if( listLIST_IS_EMPTY( &( pxQueue->xTasksWaitingToSend ) ) == pdFALSE )
|
|
{
|
|
if( xTaskRemoveFromEventList( &( pxQueue->xTasksWaitingToSend ) ) == pdTRUE )
|
|
{
|
|
portYIELD_WITHIN_API();
|
|
}
|
|
}
|
|
}
|
|
else
|
|
{
|
|
traceQUEUE_PEEK( pxQueue );
|
|
|
|
/* We are not removing the data, so reset our read
|
|
pointer. */
|
|
pxQueue->pcReadFrom = pcOriginalReadPosition;
|
|
|
|
/* The data is being left in the queue, so see if there are
|
|
any other tasks waiting for the data. */
|
|
if( listLIST_IS_EMPTY( &( pxQueue->xTasksWaitingToReceive ) ) == pdFALSE )
|
|
{
|
|
/* Tasks that are removed from the event list will get added to
|
|
the pending ready list as the scheduler is still suspended. */
|
|
if( xTaskRemoveFromEventList( &( pxQueue->xTasksWaitingToReceive ) ) != pdFALSE )
|
|
{
|
|
/* The task waiting has a higher priority than this task. */
|
|
portYIELD_WITHIN_API();
|
|
}
|
|
}
|
|
|
|
}
|
|
|
|
taskEXIT_CRITICAL();
|
|
return pdPASS;
|
|
}
|
|
else
|
|
{
|
|
if( xTicksToWait == ( portTickType ) 0 )
|
|
{
|
|
taskEXIT_CRITICAL();
|
|
traceQUEUE_RECEIVE_FAILED( pxQueue );
|
|
return errQUEUE_EMPTY;
|
|
}
|
|
else if( xEntryTimeSet == pdFALSE )
|
|
{
|
|
vTaskSetTimeOutState( &xTimeOut );
|
|
xEntryTimeSet = pdTRUE;
|
|
}
|
|
}
|
|
}
|
|
taskEXIT_CRITICAL();
|
|
|
|
taskENTER_CRITICAL();
|
|
{
|
|
if( xTaskCheckForTimeOut( &xTimeOut, &xTicksToWait ) == pdFALSE )
|
|
{
|
|
if( prvIsQueueEmpty( pxQueue ) != pdFALSE )
|
|
{
|
|
traceBLOCKING_ON_QUEUE_RECEIVE( pxQueue );
|
|
|
|
#if ( configUSE_MUTEXES == 1 )
|
|
{
|
|
if( pxQueue->uxQueueType == queueQUEUE_IS_MUTEX )
|
|
{
|
|
portENTER_CRITICAL();
|
|
{
|
|
vTaskPriorityInherit( ( void * ) pxQueue->pxMutexHolder );
|
|
}
|
|
portEXIT_CRITICAL();
|
|
}
|
|
}
|
|
#endif
|
|
|
|
vTaskPlaceOnEventList( &( pxQueue->xTasksWaitingToReceive ), xTicksToWait );
|
|
portYIELD_WITHIN_API();
|
|
}
|
|
}
|
|
else
|
|
{
|
|
taskEXIT_CRITICAL();
|
|
traceQUEUE_RECEIVE_FAILED( pxQueue );
|
|
return errQUEUE_EMPTY;
|
|
}
|
|
}
|
|
taskEXIT_CRITICAL();
|
|
}
|
|
}
|
|
|
|
|
|
#endif /* configUSE_ALTERNATIVE_API */
|
|
/*-----------------------------------------------------------*/
|
|
|
|
signed portBASE_TYPE xQueueGenericSendFromISR( xQueueHandle pxQueue, const void * const pvItemToQueue, signed portBASE_TYPE *pxHigherPriorityTaskWoken, portBASE_TYPE xCopyPosition )
|
|
{
|
|
signed portBASE_TYPE xReturn;
|
|
unsigned portBASE_TYPE uxSavedInterruptStatus;
|
|
|
|
configASSERT( pxQueue );
|
|
configASSERT( !( ( pvItemToQueue == NULL ) && ( pxQueue->uxItemSize != ( unsigned portBASE_TYPE ) 0U ) ) );
|
|
|
|
/* Similar to xQueueGenericSend, except we don't block if there is no room
|
|
in the queue. Also we don't directly wake a task that was blocked on a
|
|
queue read, instead we return a flag to say whether a context switch is
|
|
required or not (i.e. has a task with a higher priority than us been woken
|
|
by this post). */
|
|
uxSavedInterruptStatus = portSET_INTERRUPT_MASK_FROM_ISR();
|
|
{
|
|
if( pxQueue->uxMessagesWaiting < pxQueue->uxLength )
|
|
{
|
|
traceQUEUE_SEND_FROM_ISR( pxQueue );
|
|
|
|
prvCopyDataToQueue( pxQueue, pvItemToQueue, xCopyPosition );
|
|
|
|
/* If the queue is locked we do not alter the event list. This will
|
|
be done when the queue is unlocked later. */
|
|
if( pxQueue->xTxLock == queueUNLOCKED )
|
|
{
|
|
if( listLIST_IS_EMPTY( &( pxQueue->xTasksWaitingToReceive ) ) == pdFALSE )
|
|
{
|
|
if( xTaskRemoveFromEventList( &( pxQueue->xTasksWaitingToReceive ) ) != pdFALSE )
|
|
{
|
|
/* The task waiting has a higher priority so record that a
|
|
context switch is required. */
|
|
if( pxHigherPriorityTaskWoken != NULL )
|
|
{
|
|
*pxHigherPriorityTaskWoken = pdTRUE;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
else
|
|
{
|
|
/* Increment the lock count so the task that unlocks the queue
|
|
knows that data was posted while it was locked. */
|
|
++( pxQueue->xTxLock );
|
|
}
|
|
|
|
xReturn = pdPASS;
|
|
}
|
|
else
|
|
{
|
|
traceQUEUE_SEND_FROM_ISR_FAILED( pxQueue );
|
|
xReturn = errQUEUE_FULL;
|
|
}
|
|
}
|
|
portCLEAR_INTERRUPT_MASK_FROM_ISR( uxSavedInterruptStatus );
|
|
|
|
return xReturn;
|
|
}
|
|
/*-----------------------------------------------------------*/
|
|
|
|
signed portBASE_TYPE xQueueGenericReceive( xQueueHandle pxQueue, void * const pvBuffer, portTickType xTicksToWait, portBASE_TYPE xJustPeeking )
|
|
{
|
|
signed portBASE_TYPE xEntryTimeSet = pdFALSE;
|
|
xTimeOutType xTimeOut;
|
|
signed char *pcOriginalReadPosition;
|
|
|
|
configASSERT( pxQueue );
|
|
configASSERT( !( ( pvBuffer == NULL ) && ( pxQueue->uxItemSize != ( unsigned portBASE_TYPE ) 0U ) ) );
|
|
|
|
/* This function relaxes the coding standard somewhat to allow return
|
|
statements within the function itself. This is done in the interest
|
|
of execution time efficiency. */
|
|
|
|
for( ;; )
|
|
{
|
|
taskENTER_CRITICAL();
|
|
{
|
|
/* Is there data in the queue now? To be running we must be
|
|
the highest priority task wanting to access the queue. */
|
|
if( pxQueue->uxMessagesWaiting > ( unsigned portBASE_TYPE ) 0 )
|
|
{
|
|
/* Remember our read position in case we are just peeking. */
|
|
pcOriginalReadPosition = pxQueue->pcReadFrom;
|
|
|
|
prvCopyDataFromQueue( pxQueue, pvBuffer );
|
|
|
|
if( xJustPeeking == pdFALSE )
|
|
{
|
|
traceQUEUE_RECEIVE( pxQueue );
|
|
|
|
/* We are actually removing data. */
|
|
--( pxQueue->uxMessagesWaiting );
|
|
|
|
#if ( configUSE_MUTEXES == 1 )
|
|
{
|
|
if( pxQueue->uxQueueType == queueQUEUE_IS_MUTEX )
|
|
{
|
|
/* Record the information required to implement
|
|
priority inheritance should it become necessary. */
|
|
pxQueue->pxMutexHolder = xTaskGetCurrentTaskHandle();
|
|
}
|
|
}
|
|
#endif
|
|
|
|
if( listLIST_IS_EMPTY( &( pxQueue->xTasksWaitingToSend ) ) == pdFALSE )
|
|
{
|
|
if( xTaskRemoveFromEventList( &( pxQueue->xTasksWaitingToSend ) ) == pdTRUE )
|
|
{
|
|
portYIELD_WITHIN_API();
|
|
}
|
|
}
|
|
}
|
|
else
|
|
{
|
|
traceQUEUE_PEEK( pxQueue );
|
|
|
|
/* We are not removing the data, so reset our read
|
|
pointer. */
|
|
pxQueue->pcReadFrom = pcOriginalReadPosition;
|
|
|
|
/* The data is being left in the queue, so see if there are
|
|
any other tasks waiting for the data. */
|
|
if( listLIST_IS_EMPTY( &( pxQueue->xTasksWaitingToReceive ) ) == pdFALSE )
|
|
{
|
|
/* Tasks that are removed from the event list will get added to
|
|
the pending ready list as the scheduler is still suspended. */
|
|
if( xTaskRemoveFromEventList( &( pxQueue->xTasksWaitingToReceive ) ) != pdFALSE )
|
|
{
|
|
/* The task waiting has a higher priority than this task. */
|
|
portYIELD_WITHIN_API();
|
|
}
|
|
}
|
|
}
|
|
|
|
taskEXIT_CRITICAL();
|
|
return pdPASS;
|
|
}
|
|
else
|
|
{
|
|
if( xTicksToWait == ( portTickType ) 0 )
|
|
{
|
|
/* The queue was empty and no block time is specified (or
|
|
the block time has expired) so leave now. */
|
|
taskEXIT_CRITICAL();
|
|
traceQUEUE_RECEIVE_FAILED( pxQueue );
|
|
return errQUEUE_EMPTY;
|
|
}
|
|
else if( xEntryTimeSet == pdFALSE )
|
|
{
|
|
/* The queue was empty and a block time was specified so
|
|
configure the timeout structure. */
|
|
vTaskSetTimeOutState( &xTimeOut );
|
|
xEntryTimeSet = pdTRUE;
|
|
}
|
|
}
|
|
}
|
|
taskEXIT_CRITICAL();
|
|
|
|
/* Interrupts and other tasks can send to and receive from the queue
|
|
now the critical section has been exited. */
|
|
|
|
vTaskSuspendAll();
|
|
prvLockQueue( pxQueue );
|
|
|
|
/* Update the timeout state to see if it has expired yet. */
|
|
if( xTaskCheckForTimeOut( &xTimeOut, &xTicksToWait ) == pdFALSE )
|
|
{
|
|
if( prvIsQueueEmpty( pxQueue ) != pdFALSE )
|
|
{
|
|
traceBLOCKING_ON_QUEUE_RECEIVE( pxQueue );
|
|
|
|
#if ( configUSE_MUTEXES == 1 )
|
|
{
|
|
if( pxQueue->uxQueueType == queueQUEUE_IS_MUTEX )
|
|
{
|
|
portENTER_CRITICAL();
|
|
{
|
|
vTaskPriorityInherit( ( void * ) pxQueue->pxMutexHolder );
|
|
}
|
|
portEXIT_CRITICAL();
|
|
}
|
|
}
|
|
#endif
|
|
|
|
vTaskPlaceOnEventList( &( pxQueue->xTasksWaitingToReceive ), xTicksToWait );
|
|
prvUnlockQueue( pxQueue );
|
|
if( xTaskResumeAll() == pdFALSE )
|
|
{
|
|
portYIELD_WITHIN_API();
|
|
}
|
|
}
|
|
else
|
|
{
|
|
/* Try again. */
|
|
prvUnlockQueue( pxQueue );
|
|
( void ) xTaskResumeAll();
|
|
}
|
|
}
|
|
else
|
|
{
|
|
prvUnlockQueue( pxQueue );
|
|
( void ) xTaskResumeAll();
|
|
traceQUEUE_RECEIVE_FAILED( pxQueue );
|
|
return errQUEUE_EMPTY;
|
|
}
|
|
}
|
|
}
|
|
/*-----------------------------------------------------------*/
|
|
|
|
signed portBASE_TYPE xQueueReceiveFromISR( xQueueHandle pxQueue, void * const pvBuffer, signed portBASE_TYPE *pxHigherPriorityTaskWoken )
|
|
{
|
|
signed portBASE_TYPE xReturn;
|
|
unsigned portBASE_TYPE uxSavedInterruptStatus;
|
|
|
|
configASSERT( pxQueue );
|
|
configASSERT( !( ( pvBuffer == NULL ) && ( pxQueue->uxItemSize != ( unsigned portBASE_TYPE ) 0U ) ) );
|
|
|
|
uxSavedInterruptStatus = portSET_INTERRUPT_MASK_FROM_ISR();
|
|
{
|
|
/* We cannot block from an ISR, so check there is data available. */
|
|
if( pxQueue->uxMessagesWaiting > ( unsigned portBASE_TYPE ) 0 )
|
|
{
|
|
traceQUEUE_RECEIVE_FROM_ISR( pxQueue );
|
|
|
|
prvCopyDataFromQueue( pxQueue, pvBuffer );
|
|
--( pxQueue->uxMessagesWaiting );
|
|
|
|
/* If the queue is locked we will not modify the event list. Instead
|
|
we update the lock count so the task that unlocks the queue will know
|
|
that an ISR has removed data while the queue was locked. */
|
|
if( pxQueue->xRxLock == queueUNLOCKED )
|
|
{
|
|
if( listLIST_IS_EMPTY( &( pxQueue->xTasksWaitingToSend ) ) == pdFALSE )
|
|
{
|
|
if( xTaskRemoveFromEventList( &( pxQueue->xTasksWaitingToSend ) ) != pdFALSE )
|
|
{
|
|
/* The task waiting has a higher priority than us so
|
|
force a context switch. */
|
|
if( pxHigherPriorityTaskWoken != NULL )
|
|
{
|
|
*pxHigherPriorityTaskWoken = pdTRUE;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
else
|
|
{
|
|
/* Increment the lock count so the task that unlocks the queue
|
|
knows that data was removed while it was locked. */
|
|
++( pxQueue->xRxLock );
|
|
}
|
|
|
|
xReturn = pdPASS;
|
|
}
|
|
else
|
|
{
|
|
xReturn = pdFAIL;
|
|
traceQUEUE_RECEIVE_FROM_ISR_FAILED( pxQueue );
|
|
}
|
|
}
|
|
portCLEAR_INTERRUPT_MASK_FROM_ISR( uxSavedInterruptStatus );
|
|
|
|
return xReturn;
|
|
}
|
|
/*-----------------------------------------------------------*/
|
|
|
|
unsigned portBASE_TYPE uxQueueMessagesWaiting( const xQueueHandle pxQueue )
|
|
{
|
|
unsigned portBASE_TYPE uxReturn;
|
|
|
|
configASSERT( pxQueue );
|
|
|
|
taskENTER_CRITICAL();
|
|
uxReturn = pxQueue->uxMessagesWaiting;
|
|
taskEXIT_CRITICAL();
|
|
|
|
return uxReturn;
|
|
}
|
|
/*-----------------------------------------------------------*/
|
|
|
|
unsigned portBASE_TYPE uxQueueMessagesWaitingFromISR( const xQueueHandle pxQueue )
|
|
{
|
|
unsigned portBASE_TYPE uxReturn;
|
|
|
|
configASSERT( pxQueue );
|
|
|
|
uxReturn = pxQueue->uxMessagesWaiting;
|
|
|
|
return uxReturn;
|
|
}
|
|
/*-----------------------------------------------------------*/
|
|
|
|
void vQueueDelete( xQueueHandle pxQueue )
|
|
{
|
|
configASSERT( pxQueue );
|
|
|
|
traceQUEUE_DELETE( pxQueue );
|
|
vQueueUnregisterQueue( pxQueue );
|
|
vPortFree( pxQueue->pcHead );
|
|
vPortFree( pxQueue );
|
|
}
|
|
/*-----------------------------------------------------------*/
|
|
|
|
#if ( configUSE_TRACE_FACILITY == 1 )
|
|
|
|
unsigned char ucQueueGetQueueNumber( xQueueHandle pxQueue )
|
|
{
|
|
return pxQueue->ucQueueNumber;
|
|
}
|
|
|
|
#endif
|
|
/*-----------------------------------------------------------*/
|
|
|
|
#if ( configUSE_TRACE_FACILITY == 1 )
|
|
|
|
void vQueueSetQueueNumber( xQueueHandle pxQueue, unsigned char ucQueueNumber )
|
|
{
|
|
pxQueue->ucQueueNumber = ucQueueNumber;
|
|
}
|
|
|
|
#endif
|
|
/*-----------------------------------------------------------*/
|
|
|
|
#if ( configUSE_TRACE_FACILITY == 1 )
|
|
|
|
unsigned char ucQueueGetQueueType( xQueueHandle pxQueue )
|
|
{
|
|
return pxQueue->ucQueueType;
|
|
}
|
|
|
|
#endif
|
|
/*-----------------------------------------------------------*/
|
|
|
|
static void prvCopyDataToQueue( xQUEUE *pxQueue, const void *pvItemToQueue, portBASE_TYPE xPosition )
|
|
{
|
|
if( pxQueue->uxItemSize == ( unsigned portBASE_TYPE ) 0 )
|
|
{
|
|
#if ( configUSE_MUTEXES == 1 )
|
|
{
|
|
if( pxQueue->uxQueueType == queueQUEUE_IS_MUTEX )
|
|
{
|
|
/* The mutex is no longer being held. */
|
|
vTaskPriorityDisinherit( ( void * ) pxQueue->pxMutexHolder );
|
|
pxQueue->pxMutexHolder = NULL;
|
|
}
|
|
}
|
|
#endif
|
|
}
|
|
else if( xPosition == queueSEND_TO_BACK )
|
|
{
|
|
memcpy( ( void * ) pxQueue->pcWriteTo, pvItemToQueue, ( unsigned ) pxQueue->uxItemSize );
|
|
pxQueue->pcWriteTo += pxQueue->uxItemSize;
|
|
if( pxQueue->pcWriteTo >= pxQueue->pcTail )
|
|
{
|
|
pxQueue->pcWriteTo = pxQueue->pcHead;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
memcpy( ( void * ) pxQueue->pcReadFrom, pvItemToQueue, ( unsigned ) pxQueue->uxItemSize );
|
|
pxQueue->pcReadFrom -= pxQueue->uxItemSize;
|
|
if( pxQueue->pcReadFrom < pxQueue->pcHead )
|
|
{
|
|
pxQueue->pcReadFrom = ( pxQueue->pcTail - pxQueue->uxItemSize );
|
|
}
|
|
}
|
|
|
|
++( pxQueue->uxMessagesWaiting );
|
|
}
|
|
/*-----------------------------------------------------------*/
|
|
|
|
static void prvCopyDataFromQueue( xQUEUE * const pxQueue, const void *pvBuffer )
|
|
{
|
|
if( pxQueue->uxQueueType != queueQUEUE_IS_MUTEX )
|
|
{
|
|
pxQueue->pcReadFrom += pxQueue->uxItemSize;
|
|
if( pxQueue->pcReadFrom >= pxQueue->pcTail )
|
|
{
|
|
pxQueue->pcReadFrom = pxQueue->pcHead;
|
|
}
|
|
memcpy( ( void * ) pvBuffer, ( void * ) pxQueue->pcReadFrom, ( unsigned ) pxQueue->uxItemSize );
|
|
}
|
|
}
|
|
/*-----------------------------------------------------------*/
|
|
|
|
static void prvUnlockQueue( xQueueHandle pxQueue )
|
|
{
|
|
/* THIS FUNCTION MUST BE CALLED WITH THE SCHEDULER SUSPENDED. */
|
|
|
|
/* The lock counts contains the number of extra data items placed or
|
|
removed from the queue while the queue was locked. When a queue is
|
|
locked items can be added or removed, but the event lists cannot be
|
|
updated. */
|
|
taskENTER_CRITICAL();
|
|
{
|
|
/* See if data was added to the queue while it was locked. */
|
|
while( pxQueue->xTxLock > queueLOCKED_UNMODIFIED )
|
|
{
|
|
/* Data was posted while the queue was locked. Are any tasks
|
|
blocked waiting for data to become available? */
|
|
if( listLIST_IS_EMPTY( &( pxQueue->xTasksWaitingToReceive ) ) == pdFALSE )
|
|
{
|
|
/* Tasks that are removed from the event list will get added to
|
|
the pending ready list as the scheduler is still suspended. */
|
|
if( xTaskRemoveFromEventList( &( pxQueue->xTasksWaitingToReceive ) ) != pdFALSE )
|
|
{
|
|
/* The task waiting has a higher priority so record that a
|
|
context switch is required. */
|
|
vTaskMissedYield();
|
|
}
|
|
|
|
--( pxQueue->xTxLock );
|
|
}
|
|
else
|
|
{
|
|
break;
|
|
}
|
|
}
|
|
|
|
pxQueue->xTxLock = queueUNLOCKED;
|
|
}
|
|
taskEXIT_CRITICAL();
|
|
|
|
/* Do the same for the Rx lock. */
|
|
taskENTER_CRITICAL();
|
|
{
|
|
while( pxQueue->xRxLock > queueLOCKED_UNMODIFIED )
|
|
{
|
|
if( listLIST_IS_EMPTY( &( pxQueue->xTasksWaitingToSend ) ) == pdFALSE )
|
|
{
|
|
if( xTaskRemoveFromEventList( &( pxQueue->xTasksWaitingToSend ) ) != pdFALSE )
|
|
{
|
|
vTaskMissedYield();
|
|
}
|
|
|
|
--( pxQueue->xRxLock );
|
|
}
|
|
else
|
|
{
|
|
break;
|
|
}
|
|
}
|
|
|
|
pxQueue->xRxLock = queueUNLOCKED;
|
|
}
|
|
taskEXIT_CRITICAL();
|
|
}
|
|
/*-----------------------------------------------------------*/
|
|
|
|
static signed portBASE_TYPE prvIsQueueEmpty( const xQueueHandle pxQueue )
|
|
{
|
|
signed portBASE_TYPE xReturn;
|
|
|
|
taskENTER_CRITICAL();
|
|
xReturn = ( pxQueue->uxMessagesWaiting == ( unsigned portBASE_TYPE ) 0 );
|
|
taskEXIT_CRITICAL();
|
|
|
|
return xReturn;
|
|
}
|
|
/*-----------------------------------------------------------*/
|
|
|
|
signed portBASE_TYPE xQueueIsQueueEmptyFromISR( const xQueueHandle pxQueue )
|
|
{
|
|
signed portBASE_TYPE xReturn;
|
|
|
|
configASSERT( pxQueue );
|
|
xReturn = ( pxQueue->uxMessagesWaiting == ( unsigned portBASE_TYPE ) 0 );
|
|
|
|
return xReturn;
|
|
}
|
|
/*-----------------------------------------------------------*/
|
|
|
|
static signed portBASE_TYPE prvIsQueueFull( const xQueueHandle pxQueue )
|
|
{
|
|
signed portBASE_TYPE xReturn;
|
|
|
|
taskENTER_CRITICAL();
|
|
xReturn = ( pxQueue->uxMessagesWaiting == pxQueue->uxLength );
|
|
taskEXIT_CRITICAL();
|
|
|
|
return xReturn;
|
|
}
|
|
/*-----------------------------------------------------------*/
|
|
|
|
signed portBASE_TYPE xQueueIsQueueFullFromISR( const xQueueHandle pxQueue )
|
|
{
|
|
signed portBASE_TYPE xReturn;
|
|
|
|
configASSERT( pxQueue );
|
|
xReturn = ( pxQueue->uxMessagesWaiting == pxQueue->uxLength );
|
|
|
|
return xReturn;
|
|
}
|
|
/*-----------------------------------------------------------*/
|
|
|
|
#if configUSE_CO_ROUTINES == 1
|
|
signed portBASE_TYPE xQueueCRSend( xQueueHandle pxQueue, const void *pvItemToQueue, portTickType xTicksToWait )
|
|
{
|
|
signed portBASE_TYPE xReturn;
|
|
|
|
/* If the queue is already full we may have to block. A critical section
|
|
is required to prevent an interrupt removing something from the queue
|
|
between the check to see if the queue is full and blocking on the queue. */
|
|
portDISABLE_INTERRUPTS();
|
|
{
|
|
if( prvIsQueueFull( pxQueue ) != pdFALSE )
|
|
{
|
|
/* The queue is full - do we want to block or just leave without
|
|
posting? */
|
|
if( xTicksToWait > ( portTickType ) 0 )
|
|
{
|
|
/* As this is called from a coroutine we cannot block directly, but
|
|
return indicating that we need to block. */
|
|
vCoRoutineAddToDelayedList( xTicksToWait, &( pxQueue->xTasksWaitingToSend ) );
|
|
portENABLE_INTERRUPTS();
|
|
return errQUEUE_BLOCKED;
|
|
}
|
|
else
|
|
{
|
|
portENABLE_INTERRUPTS();
|
|
return errQUEUE_FULL;
|
|
}
|
|
}
|
|
}
|
|
portENABLE_INTERRUPTS();
|
|
|
|
portNOP();
|
|
|
|
portDISABLE_INTERRUPTS();
|
|
{
|
|
if( pxQueue->uxMessagesWaiting < pxQueue->uxLength )
|
|
{
|
|
/* There is room in the queue, copy the data into the queue. */
|
|
prvCopyDataToQueue( pxQueue, pvItemToQueue, queueSEND_TO_BACK );
|
|
xReturn = pdPASS;
|
|
|
|
/* Were any co-routines waiting for data to become available? */
|
|
if( listLIST_IS_EMPTY( &( pxQueue->xTasksWaitingToReceive ) ) == pdFALSE )
|
|
{
|
|
/* In this instance the co-routine could be placed directly
|
|
into the ready list as we are within a critical section.
|
|
Instead the same pending ready list mechanism is used as if
|
|
the event were caused from within an interrupt. */
|
|
if( xCoRoutineRemoveFromEventList( &( pxQueue->xTasksWaitingToReceive ) ) != pdFALSE )
|
|
{
|
|
/* The co-routine waiting has a higher priority so record
|
|
that a yield might be appropriate. */
|
|
xReturn = errQUEUE_YIELD;
|
|
}
|
|
}
|
|
}
|
|
else
|
|
{
|
|
xReturn = errQUEUE_FULL;
|
|
}
|
|
}
|
|
portENABLE_INTERRUPTS();
|
|
|
|
return xReturn;
|
|
}
|
|
#endif
|
|
/*-----------------------------------------------------------*/
|
|
|
|
#if configUSE_CO_ROUTINES == 1
|
|
signed portBASE_TYPE xQueueCRReceive( xQueueHandle pxQueue, void *pvBuffer, portTickType xTicksToWait )
|
|
{
|
|
signed portBASE_TYPE xReturn;
|
|
|
|
/* If the queue is already empty we may have to block. A critical section
|
|
is required to prevent an interrupt adding something to the queue
|
|
between the check to see if the queue is empty and blocking on the queue. */
|
|
portDISABLE_INTERRUPTS();
|
|
{
|
|
if( pxQueue->uxMessagesWaiting == ( unsigned portBASE_TYPE ) 0 )
|
|
{
|
|
/* There are no messages in the queue, do we want to block or just
|
|
leave with nothing? */
|
|
if( xTicksToWait > ( portTickType ) 0 )
|
|
{
|
|
/* As this is a co-routine we cannot block directly, but return
|
|
indicating that we need to block. */
|
|
vCoRoutineAddToDelayedList( xTicksToWait, &( pxQueue->xTasksWaitingToReceive ) );
|
|
portENABLE_INTERRUPTS();
|
|
return errQUEUE_BLOCKED;
|
|
}
|
|
else
|
|
{
|
|
portENABLE_INTERRUPTS();
|
|
return errQUEUE_FULL;
|
|
}
|
|
}
|
|
}
|
|
portENABLE_INTERRUPTS();
|
|
|
|
portNOP();
|
|
|
|
portDISABLE_INTERRUPTS();
|
|
{
|
|
if( pxQueue->uxMessagesWaiting > ( unsigned portBASE_TYPE ) 0 )
|
|
{
|
|
/* Data is available from the queue. */
|
|
pxQueue->pcReadFrom += pxQueue->uxItemSize;
|
|
if( pxQueue->pcReadFrom >= pxQueue->pcTail )
|
|
{
|
|
pxQueue->pcReadFrom = pxQueue->pcHead;
|
|
}
|
|
--( pxQueue->uxMessagesWaiting );
|
|
memcpy( ( void * ) pvBuffer, ( void * ) pxQueue->pcReadFrom, ( unsigned ) pxQueue->uxItemSize );
|
|
|
|
xReturn = pdPASS;
|
|
|
|
/* Were any co-routines waiting for space to become available? */
|
|
if( listLIST_IS_EMPTY( &( pxQueue->xTasksWaitingToSend ) ) == pdFALSE )
|
|
{
|
|
/* In this instance the co-routine could be placed directly
|
|
into the ready list as we are within a critical section.
|
|
Instead the same pending ready list mechanism is used as if
|
|
the event were caused from within an interrupt. */
|
|
if( xCoRoutineRemoveFromEventList( &( pxQueue->xTasksWaitingToSend ) ) != pdFALSE )
|
|
{
|
|
xReturn = errQUEUE_YIELD;
|
|
}
|
|
}
|
|
}
|
|
else
|
|
{
|
|
xReturn = pdFAIL;
|
|
}
|
|
}
|
|
portENABLE_INTERRUPTS();
|
|
|
|
return xReturn;
|
|
}
|
|
#endif
|
|
/*-----------------------------------------------------------*/
|
|
|
|
|
|
|
|
#if configUSE_CO_ROUTINES == 1
|
|
signed portBASE_TYPE xQueueCRSendFromISR( xQueueHandle pxQueue, const void *pvItemToQueue, signed portBASE_TYPE xCoRoutinePreviouslyWoken )
|
|
{
|
|
/* Cannot block within an ISR so if there is no space on the queue then
|
|
exit without doing anything. */
|
|
if( pxQueue->uxMessagesWaiting < pxQueue->uxLength )
|
|
{
|
|
prvCopyDataToQueue( pxQueue, pvItemToQueue, queueSEND_TO_BACK );
|
|
|
|
/* We only want to wake one co-routine per ISR, so check that a
|
|
co-routine has not already been woken. */
|
|
if( xCoRoutinePreviouslyWoken == pdFALSE )
|
|
{
|
|
if( listLIST_IS_EMPTY( &( pxQueue->xTasksWaitingToReceive ) ) == pdFALSE )
|
|
{
|
|
if( xCoRoutineRemoveFromEventList( &( pxQueue->xTasksWaitingToReceive ) ) != pdFALSE )
|
|
{
|
|
return pdTRUE;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
return xCoRoutinePreviouslyWoken;
|
|
}
|
|
#endif
|
|
/*-----------------------------------------------------------*/
|
|
|
|
#if configUSE_CO_ROUTINES == 1
|
|
signed portBASE_TYPE xQueueCRReceiveFromISR( xQueueHandle pxQueue, void *pvBuffer, signed portBASE_TYPE *pxCoRoutineWoken )
|
|
{
|
|
signed portBASE_TYPE xReturn;
|
|
|
|
/* We cannot block from an ISR, so check there is data available. If
|
|
not then just leave without doing anything. */
|
|
if( pxQueue->uxMessagesWaiting > ( unsigned portBASE_TYPE ) 0 )
|
|
{
|
|
/* Copy the data from the queue. */
|
|
pxQueue->pcReadFrom += pxQueue->uxItemSize;
|
|
if( pxQueue->pcReadFrom >= pxQueue->pcTail )
|
|
{
|
|
pxQueue->pcReadFrom = pxQueue->pcHead;
|
|
}
|
|
--( pxQueue->uxMessagesWaiting );
|
|
memcpy( ( void * ) pvBuffer, ( void * ) pxQueue->pcReadFrom, ( unsigned ) pxQueue->uxItemSize );
|
|
|
|
if( ( *pxCoRoutineWoken ) == pdFALSE )
|
|
{
|
|
if( listLIST_IS_EMPTY( &( pxQueue->xTasksWaitingToSend ) ) == pdFALSE )
|
|
{
|
|
if( xCoRoutineRemoveFromEventList( &( pxQueue->xTasksWaitingToSend ) ) != pdFALSE )
|
|
{
|
|
*pxCoRoutineWoken = pdTRUE;
|
|
}
|
|
}
|
|
}
|
|
|
|
xReturn = pdPASS;
|
|
}
|
|
else
|
|
{
|
|
xReturn = pdFAIL;
|
|
}
|
|
|
|
return xReturn;
|
|
}
|
|
#endif
|
|
/*-----------------------------------------------------------*/
|
|
|
|
#if configQUEUE_REGISTRY_SIZE > 0
|
|
|
|
void vQueueAddToRegistry( xQueueHandle xQueue, signed char *pcQueueName )
|
|
{
|
|
unsigned portBASE_TYPE ux;
|
|
|
|
/* See if there is an empty space in the registry. A NULL name denotes
|
|
a free slot. */
|
|
for( ux = ( unsigned portBASE_TYPE ) 0U; ux < ( unsigned portBASE_TYPE ) configQUEUE_REGISTRY_SIZE; ux++ )
|
|
{
|
|
if( xQueueRegistry[ ux ].pcQueueName == NULL )
|
|
{
|
|
/* Store the information on this queue. */
|
|
xQueueRegistry[ ux ].pcQueueName = pcQueueName;
|
|
xQueueRegistry[ ux ].xHandle = xQueue;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
#endif
|
|
/*-----------------------------------------------------------*/
|
|
|
|
#if configQUEUE_REGISTRY_SIZE > 0
|
|
|
|
static void vQueueUnregisterQueue( xQueueHandle xQueue )
|
|
{
|
|
unsigned portBASE_TYPE ux;
|
|
|
|
/* See if the handle of the queue being unregistered in actually in the
|
|
registry. */
|
|
for( ux = ( unsigned portBASE_TYPE ) 0U; ux < ( unsigned portBASE_TYPE ) configQUEUE_REGISTRY_SIZE; ux++ )
|
|
{
|
|
if( xQueueRegistry[ ux ].xHandle == xQueue )
|
|
{
|
|
/* Set the name to NULL to show that this slot if free again. */
|
|
xQueueRegistry[ ux ].pcQueueName = NULL;
|
|
break;
|
|
}
|
|
}
|
|
|
|
}
|
|
|
|
#endif
|
|
/*-----------------------------------------------------------*/
|
|
|
|
#if configUSE_TIMERS == 1
|
|
|
|
void vQueueWaitForMessageRestricted( xQueueHandle pxQueue, portTickType xTicksToWait )
|
|
{
|
|
/* This function should not be called by application code hence the
|
|
'Restricted' in its name. It is not part of the public API. It is
|
|
designed for use by kernel code, and has special calling requirements.
|
|
It can result in vListInsert() being called on a list that can only
|
|
possibly ever have one item in it, so the list will be fast, but even
|
|
so it should be called with the scheduler locked and not from a critical
|
|
section. */
|
|
|
|
/* Only do anything if there are no messages in the queue. This function
|
|
will not actually cause the task to block, just place it on a blocked
|
|
list. It will not block until the scheduler is unlocked - at which
|
|
time a yield will be performed. If an item is added to the queue while
|
|
the queue is locked, and the calling task blocks on the queue, then the
|
|
calling task will be immediately unblocked when the queue is unlocked. */
|
|
prvLockQueue( pxQueue );
|
|
if( pxQueue->uxMessagesWaiting == ( unsigned portBASE_TYPE ) 0U )
|
|
{
|
|
/* There is nothing in the queue, block for the specified period. */
|
|
vTaskPlaceOnEventListRestricted( &( pxQueue->xTasksWaitingToReceive ), xTicksToWait );
|
|
}
|
|
prvUnlockQueue( pxQueue );
|
|
}
|
|
|
|
#endif
|
|
|