git.sur5r.net Git - freertos/blob - FreeRTOS/Source/queue.c

   1 /*\r
   2     FreeRTOS V7.4.2 - Copyright (C) 2013 Real Time Engineers Ltd.\r
   3 \r
   4     FEATURES AND PORTS ARE ADDED TO FREERTOS ALL THE TIME.  PLEASE VISIT\r
   5     http://www.FreeRTOS.org TO ENSURE YOU ARE USING THE LATEST VERSION.\r
   6 \r
   7     ***************************************************************************\r
   8      *                                                                       *\r
   9      *    FreeRTOS tutorial books are available in pdf and paperback.        *\r
  10      *    Complete, revised, and edited pdf reference manuals are also       *\r
  11      *    available.                                                         *\r
  12      *                                                                       *\r
  13      *    Purchasing FreeRTOS documentation will not only help you, by       *\r
  14      *    ensuring you get running as quickly as possible and with an        *\r
  15      *    in-depth knowledge of how to use FreeRTOS, it will also help       *\r
  16      *    the FreeRTOS project to continue with its mission of providing     *\r
  17      *    professional grade, cross platform, de facto standard solutions    *\r
  18      *    for microcontrollers - completely free of charge!                  *\r
  19      *                                                                       *\r
  20      *    >>> See http://www.FreeRTOS.org/Documentation for details. <<<     *\r
  21      *                                                                       *\r
  22      *    Thank you for using FreeRTOS, and thank you for your support!      *\r
  23      *                                                                       *\r
  24     ***************************************************************************\r
  25 \r
  26 \r
  27     This file is part of the FreeRTOS distribution.\r
  28 \r
  29     FreeRTOS is free software; you can redistribute it and/or modify it under\r
  30     the terms of the GNU General Public License (version 2) as published by the\r
  31     Free Software Foundation AND MODIFIED BY the FreeRTOS exception.\r
  32 \r
  33     >>>>>>NOTE<<<<<< The modification to the GPL is included to allow you to\r
  34     distribute a combined work that includes FreeRTOS without being obliged to\r
  35     provide the source code for proprietary components outside of the FreeRTOS\r
  36     kernel.\r
  37 \r
  38     FreeRTOS is distributed in the hope that it will be useful, but WITHOUT ANY\r
  39     WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS\r
  40     FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more\r
  41     details. You should have received a copy of the GNU General Public License\r
  42     and the FreeRTOS license exception along with FreeRTOS; if not it can be\r
  43     viewed here: http://www.freertos.org/a00114.html and also obtained by\r
  44     writing to Real Time Engineers Ltd., contact details for whom are available\r
  45     on the FreeRTOS WEB site.\r
  46 \r
  47     1 tab == 4 spaces!\r
  48 \r
  49     ***************************************************************************\r
  50      *                                                                       *\r
  51      *    Having a problem?  Start by reading the FAQ "My application does   *\r
  52      *    not run, what could be wrong?"                                     *\r
  53      *                                                                       *\r
  54      *    http://www.FreeRTOS.org/FAQHelp.html                               *\r
  55      *                                                                       *\r
  56     ***************************************************************************\r
  57 \r
  58 \r
  59     http://www.FreeRTOS.org - Documentation, books, training, latest versions,\r
  60     license and Real Time Engineers Ltd. contact details.\r
  61 \r
  62     http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products,\r
  63     including FreeRTOS+Trace - an indispensable productivity tool, and our new\r
  64     fully thread aware and reentrant UDP/IP stack.\r
  65 \r
  66     http://www.OpenRTOS.com - Real Time Engineers ltd license FreeRTOS to High\r
  67     Integrity Systems, who sell the code with commercial support,\r
  68     indemnification and middleware, under the OpenRTOS brand.\r
  69 \r
  70     http://www.SafeRTOS.com - High Integrity Systems also provide a safety\r
  71     engineered and independently SIL3 certified version for use in safety and\r
  72     mission critical applications that require provable dependability.\r
  73 */\r
  74 \r
  75 #include <stdlib.h>\r
  76 #include <string.h>\r
  77 \r
  78 /* Defining MPU_WRAPPERS_INCLUDED_FROM_API_FILE prevents task.h from redefining\r
  79 all the API functions to use the MPU wrappers.  That should only be done when\r
  80 task.h is included from an application file. */\r
  81 #define MPU_WRAPPERS_INCLUDED_FROM_API_FILE\r
  82 \r
  83 #include "FreeRTOS.h"\r
  84 #include "task.h"\r
  85 #include "queue.h"\r
  86 \r
  87 #if ( configUSE_CO_ROUTINES == 1 )\r
  88         #include "croutine.h"\r
  89 #endif\r
  90 \r
  91 /* Lint e961 and e750 are suppressed as a MISRA exception justified because the\r
  92 MPU ports require MPU_WRAPPERS_INCLUDED_FROM_API_FILE to be defined for the\r
  93 header files above, but not in this file, in order to generate the correct\r
  94 privileged Vs unprivileged linkage and placement. */\r
  95 #undef MPU_WRAPPERS_INCLUDED_FROM_API_FILE /*lint !e961 !e750. */\r
  96 \r
  97 \r
  98 /* Constants used with the cRxLock and xTxLock structure members. */\r
  99 #define queueUNLOCKED                                   ( ( signed portBASE_TYPE ) -1 )\r
 100 #define queueLOCKED_UNMODIFIED                  ( ( signed portBASE_TYPE ) 0 )\r
 101 \r
 102 /* When the xQUEUE structure is used to represent a base queue its pcHead and\r
 103 pcTail members are used as pointers into the queue storage area.  When the\r
 104 xQUEUE structure is used to represent a mutex pcHead and pcTail pointers are\r
 105 not necessary, and the pcHead pointer is set to NULL to indicate that the\r
 106 pcTail pointer actually points to the mutex holder (if any).  Map alternative\r
 107 names to the pcHead and pcTail structure members to ensure the readability of\r
 108 the code is maintained despite this dual use of two structure members.  An\r
 109 alternative implementation would be to use a union, but use of a union is\r
 110 against the coding standard (although an exception to the standard has been\r
 111 permitted where the dual use also significantly changes the type of the\r
 112 structure member). */\r
 113 #define pxMutexHolder                                   pcTail\r
 114 #define uxQueueType                                             pcHead\r
 115 #define queueQUEUE_IS_MUTEX                             NULL\r
 116 \r
 117 /* Semaphores do not actually store or copy data, so have an item size of\r
 118 zero. */\r
 119 #define queueSEMAPHORE_QUEUE_ITEM_LENGTH ( ( unsigned portBASE_TYPE ) 0 )\r
 120 #define queueMUTEX_GIVE_BLOCK_TIME               ( ( portTickType ) 0U )\r
 121 \r
 122 \r
 123 /*\r
 124  * Definition of the queue used by the scheduler.\r
 125  * Items are queued by copy, not reference.\r
 126  */\r
 127 typedef struct QueueDefinition\r
 128 {\r
 129         signed char *pcHead;                                    /*< Points to the beginning of the queue storage area. */\r
 130         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. */\r
 131 \r
 132         signed char *pcWriteTo;                                 /*< Points to the free next place in the storage area. */\r
 133 \r
 134         union                                                                   /* Use of a union is an exception to the coding standard to ensure two mutually exclusive structure members don't appear simultaneously (wasting RAM). */\r
 135         {\r
 136                 signed char *pcReadFrom;                        /*< Points to the last place that a queued item was read from when the structure is used as a queue. */\r
 137                 unsigned portBASE_TYPE uxRecursiveCallCount;/*< Maintains a count of the numebr of times a recursive mutex has been recursively 'taken' when the structure is used as a mutex. */\r
 138         } u;\r
 139 \r
 140         xList xTasksWaitingToSend;                              /*< List of tasks that are blocked waiting to post onto this queue.  Stored in priority order. */\r
 141         xList xTasksWaitingToReceive;                   /*< List of tasks that are blocked waiting to read from this queue.  Stored in priority order. */\r
 142 \r
 143         volatile unsigned portBASE_TYPE uxMessagesWaiting;/*< The number of items currently in the queue. */\r
 144         unsigned portBASE_TYPE uxLength;                /*< The length of the queue defined as the number of items it will hold, not the number of bytes. */\r
 145         unsigned portBASE_TYPE uxItemSize;              /*< The size of each items that the queue will hold. */\r
 146 \r
 147         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. */\r
 148         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. */\r
 149 \r
 150         #if ( configUSE_TRACE_FACILITY == 1 )\r
 151                 unsigned char ucQueueNumber;\r
 152                 unsigned char ucQueueType;\r
 153         #endif\r
 154 \r
 155         #if ( configUSE_QUEUE_SETS == 1 )\r
 156                 struct QueueDefinition *pxQueueSetContainer;\r
 157         #endif\r
 158 \r
 159 } xQUEUE;\r
 160 /*-----------------------------------------------------------*/\r
 161 \r
 162 /*\r
 163  * The queue registry is just a means for kernel aware debuggers to locate\r
 164  * queue structures.  It has no other purpose so is an optional component.\r
 165  */\r
 166 #if ( configQUEUE_REGISTRY_SIZE > 0 )\r
 167 \r
 168         /* The type stored within the queue registry array.  This allows a name\r
 169         to be assigned to each queue making kernel aware debugging a little\r
 170         more user friendly. */\r
 171         typedef struct QUEUE_REGISTRY_ITEM\r
 172         {\r
 173                 signed char *pcQueueName;\r
 174                 xQueueHandle xHandle;\r
 175         } xQueueRegistryItem;\r
 176 \r
 177         /* The queue registry is simply an array of xQueueRegistryItem structures.\r
 178         The pcQueueName member of a structure being NULL is indicative of the\r
 179         array position being vacant. */\r
 180         xQueueRegistryItem xQueueRegistry[ configQUEUE_REGISTRY_SIZE ];\r
 181 \r
 182 #endif /* configQUEUE_REGISTRY_SIZE */\r
 183 \r
 184 /*\r
 185  * Unlocks a queue locked by a call to prvLockQueue.  Locking a queue does not\r
 186  * prevent an ISR from adding or removing items to the queue, but does prevent\r
 187  * an ISR from removing tasks from the queue event lists.  If an ISR finds a\r
 188  * queue is locked it will instead increment the appropriate queue lock count\r
 189  * to indicate that a task may require unblocking.  When the queue in unlocked\r
 190  * these lock counts are inspected, and the appropriate action taken.\r
 191  */\r
 192 static void prvUnlockQueue( xQUEUE *pxQueue ) PRIVILEGED_FUNCTION;\r
 193 \r
 194 /*\r
 195  * Uses a critical section to determine if there is any data in a queue.\r
 196  *\r
 197  * @return pdTRUE if the queue contains no items, otherwise pdFALSE.\r
 198  */\r
 199 static signed portBASE_TYPE prvIsQueueEmpty( const xQUEUE *pxQueue ) PRIVILEGED_FUNCTION;\r
 200 \r
 201 /*\r
 202  * Uses a critical section to determine if there is any space in a queue.\r
 203  *\r
 204  * @return pdTRUE if there is no space, otherwise pdFALSE;\r
 205  */\r
 206 static signed portBASE_TYPE prvIsQueueFull( const xQUEUE *pxQueue ) PRIVILEGED_FUNCTION;\r
 207 \r
 208 /*\r
 209  * Copies an item into the queue, either at the front of the queue or the\r
 210  * back of the queue.\r
 211  */\r
 212 static void prvCopyDataToQueue( xQUEUE *pxQueue, const void *pvItemToQueue, portBASE_TYPE xPosition ) PRIVILEGED_FUNCTION;\r
 213 \r
 214 /*\r
 215  * Copies an item out of a queue.\r
 216  */\r
 217 static void prvCopyDataFromQueue( xQUEUE * const pxQueue, const void * const pvBuffer ) PRIVILEGED_FUNCTION;\r
 218 \r
 219 #if ( configUSE_QUEUE_SETS == 1 )\r
 220         /*\r
 221          * Checks to see if a queue is a member of a queue set, and if so, notifies\r
 222          * the queue set that the queue contains data.\r
 223          */\r
 224         static portBASE_TYPE prvNotifyQueueSetContainer( const xQUEUE * const pxQueue, portBASE_TYPE xCopyPosition ) PRIVILEGED_FUNCTION;\r
 225 #endif\r
 226 \r
 227 /*-----------------------------------------------------------*/\r
 228 \r
 229 /*\r
 230  * Macro to mark a queue as locked.  Locking a queue prevents an ISR from\r
 231  * accessing the queue event lists.\r
 232  */\r
 233 #define prvLockQueue( pxQueue )                                                         \\r
 234         taskENTER_CRITICAL();                                                                   \\r
 235         {                                                                                                               \\r
 236                 if( ( pxQueue )->xRxLock == queueUNLOCKED )                     \\r
 237                 {                                                                                                       \\r
 238                         ( pxQueue )->xRxLock = queueLOCKED_UNMODIFIED;  \\r
 239                 }                                                                                                       \\r
 240                 if( ( pxQueue )->xTxLock == queueUNLOCKED )                     \\r
 241                 {                                                                                                       \\r
 242                         ( pxQueue )->xTxLock = queueLOCKED_UNMODIFIED;  \\r
 243                 }                                                                                                       \\r
 244         }                                                                                                               \\r
 245         taskEXIT_CRITICAL()\r
 246 /*-----------------------------------------------------------*/\r
 247 \r
 248 portBASE_TYPE xQueueGenericReset( xQueueHandle xQueue, portBASE_TYPE xNewQueue )\r
 249 {\r
 250 xQUEUE * const pxQueue = ( xQUEUE * ) xQueue;\r
 251 \r
 252         configASSERT( pxQueue );\r
 253 \r
 254         taskENTER_CRITICAL();\r
 255         {\r
 256                 pxQueue->pcTail = pxQueue->pcHead + ( pxQueue->uxLength * pxQueue->uxItemSize );\r
 257                 pxQueue->uxMessagesWaiting = ( unsigned portBASE_TYPE ) 0U;\r
 258                 pxQueue->pcWriteTo = pxQueue->pcHead;\r
 259                 pxQueue->u.pcReadFrom = pxQueue->pcHead + ( ( pxQueue->uxLength - ( unsigned portBASE_TYPE ) 1U ) * pxQueue->uxItemSize );\r
 260                 pxQueue->xRxLock = queueUNLOCKED;\r
 261                 pxQueue->xTxLock = queueUNLOCKED;\r
 262 \r
 263                 if( xNewQueue == pdFALSE )\r
 264                 {\r
 265                         /* If there are tasks blocked waiting to read from the queue, then\r
 266                         the tasks will remain blocked as after this function exits the queue\r
 267                         will still be empty.  If there are tasks blocked waiting to     write to\r
 268                         the queue, then one should be unblocked as after this function exits\r
 269                         it will be possible to write to it. */\r
 270                         if( listLIST_IS_EMPTY( &( pxQueue->xTasksWaitingToSend ) ) == pdFALSE )\r
 271                         {\r
 272                                 if( xTaskRemoveFromEventList( &( pxQueue->xTasksWaitingToSend ) ) == pdTRUE )\r
 273                                 {\r
 274                                         portYIELD_WITHIN_API();\r
 275                                 }\r
 276                         }\r
 277                 }\r
 278                 else\r
 279                 {\r
 280                         /* Ensure the event queues start in the correct state. */\r
 281                         vListInitialise( &( pxQueue->xTasksWaitingToSend ) );\r
 282                         vListInitialise( &( pxQueue->xTasksWaitingToReceive ) );\r
 283                 }\r
 284         }\r
 285         taskEXIT_CRITICAL();\r
 286 \r
 287         /* A value is returned for calling semantic consistency with previous\r
 288         versions. */\r
 289         return pdPASS;\r
 290 }\r
 291 /*-----------------------------------------------------------*/\r
 292 \r
 293 xQueueHandle xQueueGenericCreate( unsigned portBASE_TYPE uxQueueLength, unsigned portBASE_TYPE uxItemSize, unsigned char ucQueueType )\r
 294 {\r
 295 xQUEUE *pxNewQueue;\r
 296 size_t xQueueSizeInBytes;\r
 297 xQueueHandle xReturn = NULL;\r
 298 \r
 299         /* Remove compiler warnings about unused parameters should\r
 300         configUSE_TRACE_FACILITY not be set to 1. */\r
 301         ( void ) ucQueueType;\r
 302 \r
 303         /* Allocate the new queue structure. */\r
 304         if( uxQueueLength > ( unsigned portBASE_TYPE ) 0 )\r
 305         {\r
 306                 pxNewQueue = ( xQUEUE * ) pvPortMalloc( sizeof( xQUEUE ) );\r
 307                 if( pxNewQueue != NULL )\r
 308                 {\r
 309                         /* Create the list of pointers to queue items.  The queue is one byte\r
 310                         longer than asked for to make wrap checking easier/faster. */\r
 311                         xQueueSizeInBytes = ( size_t ) ( uxQueueLength * uxItemSize ) + ( size_t ) 1; /*lint !e961 MISRA exception as the casts are only redundant for some ports. */\r
 312 \r
 313                         pxNewQueue->pcHead = ( signed char * ) pvPortMalloc( xQueueSizeInBytes );\r
 314                         if( pxNewQueue->pcHead != NULL )\r
 315                         {\r
 316                                 /* Initialise the queue members as described above where the\r
 317                                 queue type is defined. */\r
 318                                 pxNewQueue->uxLength = uxQueueLength;\r
 319                                 pxNewQueue->uxItemSize = uxItemSize;\r
 320                                 ( void ) xQueueGenericReset( pxNewQueue, pdTRUE );\r
 321 \r
 322                                 #if ( configUSE_TRACE_FACILITY == 1 )\r
 323                                 {\r
 324                                         pxNewQueue->ucQueueType = ucQueueType;\r
 325                                 }\r
 326                                 #endif /* configUSE_TRACE_FACILITY */\r
 327 \r
 328                                 #if( configUSE_QUEUE_SETS == 1 )\r
 329                                 {\r
 330                                         pxNewQueue->pxQueueSetContainer = NULL;\r
 331                                 }\r
 332                                 #endif /* configUSE_QUEUE_SETS */\r
 333 \r
 334                                 traceQUEUE_CREATE( pxNewQueue );\r
 335                                 xReturn = pxNewQueue;\r
 336                         }\r
 337                         else\r
 338                         {\r
 339                                 traceQUEUE_CREATE_FAILED( ucQueueType );\r
 340                                 vPortFree( pxNewQueue );\r
 341                         }\r
 342                 }\r
 343         }\r
 344 \r
 345         configASSERT( xReturn );\r
 346 \r
 347         return xReturn;\r
 348 }\r
 349 /*-----------------------------------------------------------*/\r
 350 \r
 351 #if ( configUSE_MUTEXES == 1 )\r
 352 \r
 353         xQueueHandle xQueueCreateMutex( unsigned char ucQueueType )\r
 354         {\r
 355         xQUEUE *pxNewQueue;\r
 356 \r
 357                 /* Prevent compiler warnings about unused parameters if\r
 358                 configUSE_TRACE_FACILITY does not equal 1. */\r
 359                 ( void ) ucQueueType;\r
 360 \r
 361                 /* Allocate the new queue structure. */\r
 362                 pxNewQueue = ( xQUEUE * ) pvPortMalloc( sizeof( xQUEUE ) );\r
 363                 if( pxNewQueue != NULL )\r
 364                 {\r
 365                         /* Information required for priority inheritance. */\r
 366                         pxNewQueue->pxMutexHolder = NULL;\r
 367                         pxNewQueue->uxQueueType = queueQUEUE_IS_MUTEX;\r
 368 \r
 369                         /* Queues used as a mutex no data is actually copied into or out\r
 370                         of the queue. */\r
 371                         pxNewQueue->pcWriteTo = NULL;\r
 372                         pxNewQueue->u.pcReadFrom = NULL;\r
 373 \r
 374                         /* Each mutex has a length of 1 (like a binary semaphore) and\r
 375                         an item size of 0 as nothing is actually copied into or out\r
 376                         of the mutex. */\r
 377                         pxNewQueue->uxMessagesWaiting = ( unsigned portBASE_TYPE ) 0U;\r
 378                         pxNewQueue->uxLength = ( unsigned portBASE_TYPE ) 1U;\r
 379                         pxNewQueue->uxItemSize = ( unsigned portBASE_TYPE ) 0U;\r
 380                         pxNewQueue->xRxLock = queueUNLOCKED;\r
 381                         pxNewQueue->xTxLock = queueUNLOCKED;\r
 382 \r
 383                         #if ( configUSE_TRACE_FACILITY == 1 )\r
 384                         {\r
 385                                 pxNewQueue->ucQueueType = ucQueueType;\r
 386                         }\r
 387                         #endif\r
 388 \r
 389                         #if ( configUSE_QUEUE_SETS == 1 )\r
 390                         {\r
 391                                 pxNewQueue->pxQueueSetContainer = NULL;\r
 392                         }\r
 393                         #endif\r
 394 \r
 395                         /* Ensure the event queues start with the correct state. */\r
 396                         vListInitialise( &( pxNewQueue->xTasksWaitingToSend ) );\r
 397                         vListInitialise( &( pxNewQueue->xTasksWaitingToReceive ) );\r
 398 \r
 399                         traceCREATE_MUTEX( pxNewQueue );\r
 400 \r
 401                         /* Start with the semaphore in the expected state. */\r
 402                         ( void ) xQueueGenericSend( pxNewQueue, NULL, ( portTickType ) 0U, queueSEND_TO_BACK );\r
 403                 }\r
 404                 else\r
 405                 {\r
 406                         traceCREATE_MUTEX_FAILED();\r
 407                 }\r
 408 \r
 409                 configASSERT( pxNewQueue );\r
 410                 return pxNewQueue;\r
 411         }\r
 412 \r
 413 #endif /* configUSE_MUTEXES */\r
 414 /*-----------------------------------------------------------*/\r
 415 \r
 416 #if ( ( configUSE_MUTEXES == 1 ) && ( INCLUDE_xSemaphoreGetMutexHolder == 1 ) )\r
 417 \r
 418         void* xQueueGetMutexHolder( xQueueHandle xSemaphore )\r
 419         {\r
 420         void *pxReturn;\r
 421 \r
 422                 /* This function is called by xSemaphoreGetMutexHolder(), and should not\r
 423                 be called directly.  Note:  This is is a good way of determining if the\r
 424                 calling task is the mutex holder, but not a good way of determining the\r
 425                 identity of the mutex holder, as the holder may change between the\r
 426                 following critical section exiting and the function returning. */\r
 427                 taskENTER_CRITICAL();\r
 428                 {\r
 429                         if( ( ( xQUEUE * ) xSemaphore )->uxQueueType == queueQUEUE_IS_MUTEX )\r
 430                         {\r
 431                                 pxReturn = ( void * ) ( ( xQUEUE * ) xSemaphore )->pxMutexHolder;\r
 432                         }\r
 433                         else\r
 434                         {\r
 435                                 pxReturn = NULL;\r
 436                         }\r
 437                 }\r
 438                 taskEXIT_CRITICAL();\r
 439 \r
 440                 return pxReturn;\r
 441         }\r
 442 \r
 443 #endif\r
 444 /*-----------------------------------------------------------*/\r
 445 \r
 446 #if ( configUSE_RECURSIVE_MUTEXES == 1 )\r
 447 \r
 448         portBASE_TYPE xQueueGiveMutexRecursive( xQueueHandle xMutex )\r
 449         {\r
 450         portBASE_TYPE xReturn;\r
 451         xQUEUE * const pxMutex = ( xQUEUE * ) xMutex;\r
 452 \r
 453                 configASSERT( pxMutex );\r
 454 \r
 455                 /* If this is the task that holds the mutex then pxMutexHolder will not\r
 456                 change outside of this task.  If this task does not hold the mutex then\r
 457                 pxMutexHolder can never coincidentally equal the tasks handle, and as\r
 458                 this is the only condition we are interested in it does not matter if\r
 459                 pxMutexHolder is accessed simultaneously by another task.  Therefore no\r
 460                 mutual exclusion is required to test the pxMutexHolder variable. */\r
 461                 if( pxMutex->pxMutexHolder == ( void * ) xTaskGetCurrentTaskHandle() ) /*lint !e961 Not a redundant cast as xTaskHandle is a typedef. */\r
 462                 {\r
 463                         traceGIVE_MUTEX_RECURSIVE( pxMutex );\r
 464 \r
 465                         /* uxRecursiveCallCount cannot be zero if pxMutexHolder is equal to\r
 466                         the task handle, therefore no underflow check is required.  Also,\r
 467                         uxRecursiveCallCount is only modified by the mutex holder, and as\r
 468                         there can only be one, no mutual exclusion is required to modify the\r
 469                         uxRecursiveCallCount member. */\r
 470                         ( pxMutex->u.uxRecursiveCallCount )--;\r
 471 \r
 472                         /* Have we unwound the call count? */\r
 473                         if( pxMutex->u.uxRecursiveCallCount == ( unsigned portBASE_TYPE ) 0 )\r
 474                         {\r
 475                                 /* Return the mutex.  This will automatically unblock any other\r
 476                                 task that might be waiting to access the mutex. */\r
 477                                 ( void ) xQueueGenericSend( pxMutex, NULL, queueMUTEX_GIVE_BLOCK_TIME, queueSEND_TO_BACK );\r
 478                         }\r
 479 \r
 480                         xReturn = pdPASS;\r
 481                 }\r
 482                 else\r
 483                 {\r
 484                         /* We cannot give the mutex because we are not the holder. */\r
 485                         xReturn = pdFAIL;\r
 486 \r
 487                         traceGIVE_MUTEX_RECURSIVE_FAILED( pxMutex );\r
 488                 }\r
 489 \r
 490                 return xReturn;\r
 491         }\r
 492 \r
 493 #endif /* configUSE_RECURSIVE_MUTEXES */\r
 494 /*-----------------------------------------------------------*/\r
 495 \r
 496 #if ( configUSE_RECURSIVE_MUTEXES == 1 )\r
 497 \r
 498         portBASE_TYPE xQueueTakeMutexRecursive( xQueueHandle xMutex, portTickType xBlockTime )\r
 499         {\r
 500         portBASE_TYPE xReturn;\r
 501         xQUEUE * const pxMutex = ( xQUEUE * ) xMutex;\r
 502 \r
 503                 configASSERT( pxMutex );\r
 504 \r
 505                 /* Comments regarding mutual exclusion as per those within\r
 506                 xQueueGiveMutexRecursive(). */\r
 507 \r
 508                 traceTAKE_MUTEX_RECURSIVE( pxMutex );\r
 509 \r
 510                 if( pxMutex->pxMutexHolder == ( void * )  xTaskGetCurrentTaskHandle() ) /*lint !e961 Cast is not redundant as xTaskHandle is a typedef. */\r
 511                 {\r
 512                         ( pxMutex->u.uxRecursiveCallCount )++;\r
 513                         xReturn = pdPASS;\r
 514                 }\r
 515                 else\r
 516                 {\r
 517                         xReturn = xQueueGenericReceive( pxMutex, NULL, xBlockTime, pdFALSE );\r
 518 \r
 519                         /* pdPASS will only be returned if we successfully obtained the mutex,\r
 520                         we may have blocked to reach here. */\r
 521                         if( xReturn == pdPASS )\r
 522                         {\r
 523                                 ( pxMutex->u.uxRecursiveCallCount )++;\r
 524                         }\r
 525                         else\r
 526                         {\r
 527                                 traceTAKE_MUTEX_RECURSIVE_FAILED( pxMutex );\r
 528                         }\r
 529                 }\r
 530 \r
 531                 return xReturn;\r
 532         }\r
 533 \r
 534 #endif /* configUSE_RECURSIVE_MUTEXES */\r
 535 /*-----------------------------------------------------------*/\r
 536 \r
 537 #if ( configUSE_COUNTING_SEMAPHORES == 1 )\r
 538 \r
 539         xQueueHandle xQueueCreateCountingSemaphore( unsigned portBASE_TYPE uxCountValue, unsigned portBASE_TYPE uxInitialCount )\r
 540         {\r
 541         xQueueHandle xHandle;\r
 542 \r
 543                 xHandle = xQueueGenericCreate( uxCountValue, queueSEMAPHORE_QUEUE_ITEM_LENGTH, queueQUEUE_TYPE_COUNTING_SEMAPHORE );\r
 544 \r
 545                 if( xHandle != NULL )\r
 546                 {\r
 547                         ( ( xQUEUE * ) xHandle )->uxMessagesWaiting = uxInitialCount;\r
 548 \r
 549                         traceCREATE_COUNTING_SEMAPHORE();\r
 550                 }\r
 551                 else\r
 552                 {\r
 553                         traceCREATE_COUNTING_SEMAPHORE_FAILED();\r
 554                 }\r
 555 \r
 556                 configASSERT( xHandle );\r
 557                 return xHandle;\r
 558         }\r
 559 \r
 560 #endif /* configUSE_COUNTING_SEMAPHORES */\r
 561 /*-----------------------------------------------------------*/\r
 562 \r
 563 signed portBASE_TYPE xQueueGenericSend( xQueueHandle xQueue, const void * const pvItemToQueue, portTickType xTicksToWait, portBASE_TYPE xCopyPosition )\r
 564 {\r
 565 signed portBASE_TYPE xEntryTimeSet = pdFALSE;\r
 566 xTimeOutType xTimeOut;\r
 567 xQUEUE * const pxQueue = ( xQUEUE * ) xQueue;\r
 568 \r
 569         configASSERT( pxQueue );\r
 570         configASSERT( !( ( pvItemToQueue == NULL ) && ( pxQueue->uxItemSize != ( unsigned portBASE_TYPE ) 0U ) ) );\r
 571         configASSERT( !( ( xCopyPosition == queueOVERWRITE ) && ( pxQueue->uxLength != 1 ) ) );\r
 572 \r
 573         /* This function relaxes the coding standard somewhat to allow return\r
 574         statements within the function itself.  This is done in the interest\r
 575         of execution time efficiency. */\r
 576         for( ;; )\r
 577         {\r
 578                 taskENTER_CRITICAL();\r
 579                 {\r
 580                         /* Is there room on the queue now?  The running task must be\r
 581                         the highest priority task wanting to access the queue.  If\r
 582                         the head item in the queue is to be overwritten then it does\r
 583                         not matter if the queue is full. */\r
 584                         if( ( pxQueue->uxMessagesWaiting < pxQueue->uxLength ) || ( xCopyPosition == queueOVERWRITE ) )\r
 585                         {\r
 586                                 traceQUEUE_SEND( pxQueue );\r
 587                                 prvCopyDataToQueue( pxQueue, pvItemToQueue, xCopyPosition );\r
 588 \r
 589                                 #if ( configUSE_QUEUE_SETS == 1 )\r
 590                                 {\r
 591                                         if( pxQueue->pxQueueSetContainer != NULL )\r
 592                                         {\r
 593                                                 if( prvNotifyQueueSetContainer( pxQueue, xCopyPosition ) == pdTRUE )\r
 594                                                 {\r
 595                                                         /* The queue is a member of a queue set, and posting\r
 596                                                         to the queue set caused a higher priority task to\r
 597                                                         unblock. A context switch is required. */\r
 598                                                         portYIELD_WITHIN_API();\r
 599                                                 }\r
 600                                         }\r
 601                                         else\r
 602                                         {\r
 603                                                 /* If there was a task waiting for data to arrive on the\r
 604                                                 queue then unblock it now. */\r
 605                                                 if( listLIST_IS_EMPTY( &( pxQueue->xTasksWaitingToReceive ) ) == pdFALSE )\r
 606                                                 {\r
 607                                                         if( xTaskRemoveFromEventList( &( pxQueue->xTasksWaitingToReceive ) ) == pdTRUE )\r
 608                                                         {\r
 609                                                                 /* The unblocked task has a priority higher than\r
 610                                                                 our own so yield immediately.  Yes it is ok to\r
 611                                                                 do this from within the critical section - the\r
 612                                                                 kernel takes care of that. */\r
 613                                                                 portYIELD_WITHIN_API();\r
 614                                                         }\r
 615                                                 }\r
 616                                         }\r
 617                                 }\r
 618                                 #else /* configUSE_QUEUE_SETS */\r
 619                                 {\r
 620                                         /* If there was a task waiting for data to arrive on the\r
 621                                         queue then unblock it now. */\r
 622                                         if( listLIST_IS_EMPTY( &( pxQueue->xTasksWaitingToReceive ) ) == pdFALSE )\r
 623                                         {\r
 624                                                 if( xTaskRemoveFromEventList( &( pxQueue->xTasksWaitingToReceive ) ) == pdTRUE )\r
 625                                                 {\r
 626                                                         /* The unblocked task has a priority higher than\r
 627                                                         our own so yield immediately.  Yes it is ok to do\r
 628                                                         this from within the critical section - the kernel\r
 629                                                         takes care of that. */\r
 630                                                         portYIELD_WITHIN_API();\r
 631                                                 }\r
 632                                         }\r
 633                                 }\r
 634                                 #endif /* configUSE_QUEUE_SETS */\r
 635 \r
 636                                 taskEXIT_CRITICAL();\r
 637 \r
 638                                 /* Return to the original privilege level before exiting the\r
 639                                 function. */\r
 640                                 return pdPASS;\r
 641                         }\r
 642                         else\r
 643                         {\r
 644                                 if( xTicksToWait == ( portTickType ) 0 )\r
 645                                 {\r
 646                                         /* The queue was full and no block time is specified (or\r
 647                                         the block time has expired) so leave now. */\r
 648                                         taskEXIT_CRITICAL();\r
 649 \r
 650                                         /* Return to the original privilege level before exiting\r
 651                                         the function. */\r
 652                                         traceQUEUE_SEND_FAILED( pxQueue );\r
 653                                         return errQUEUE_FULL;\r
 654                                 }\r
 655                                 else if( xEntryTimeSet == pdFALSE )\r
 656                                 {\r
 657                                         /* The queue was full and a block time was specified so\r
 658                                         configure the timeout structure. */\r
 659                                         vTaskSetTimeOutState( &xTimeOut );\r
 660                                         xEntryTimeSet = pdTRUE;\r
 661                                 }\r
 662                                 else\r
 663                                 {\r
 664                                         /* Entry time was already set. */                                       \r
 665                                 }\r
 666                         }\r
 667                 }\r
 668                 taskEXIT_CRITICAL();\r
 669 \r
 670                 /* Interrupts and other tasks can send to and receive from the queue\r
 671                 now the critical section has been exited. */\r
 672 \r
 673                 vTaskSuspendAll();\r
 674                 prvLockQueue( pxQueue );\r
 675 \r
 676                 /* Update the timeout state to see if it has expired yet. */\r
 677                 if( xTaskCheckForTimeOut( &xTimeOut, &xTicksToWait ) == pdFALSE )\r
 678                 {\r
 679                         if( prvIsQueueFull( pxQueue ) != pdFALSE )\r
 680                         {\r
 681                                 traceBLOCKING_ON_QUEUE_SEND( pxQueue );\r
 682                                 vTaskPlaceOnEventList( &( pxQueue->xTasksWaitingToSend ), xTicksToWait );\r
 683 \r
 684                                 /* Unlocking the queue means queue events can effect the\r
 685                                 event list.  It is possible     that interrupts occurring now\r
 686                                 remove this task from the event list again - but as the\r
 687                                 scheduler is suspended the task will go onto the pending\r
 688                                 ready last instead of the actual ready list. */\r
 689                                 prvUnlockQueue( pxQueue );\r
 690 \r
 691                                 /* Resuming the scheduler will move tasks from the pending\r
 692                                 ready list into the ready list - so it is feasible that this\r
 693                                 task is already in a ready list before it yields - in which\r
 694                                 case the yield will not cause a context switch unless there\r
 695                                 is also a higher priority task in the pending ready list. */\r
 696                                 if( xTaskResumeAll() == pdFALSE )\r
 697                                 {\r
 698                                         portYIELD_WITHIN_API();\r
 699                                 }\r
 700                         }\r
 701                         else\r
 702                         {\r
 703                                 /* Try again. */\r
 704                                 prvUnlockQueue( pxQueue );\r
 705                                 ( void ) xTaskResumeAll();\r
 706                         }\r
 707                 }\r
 708                 else\r
 709                 {\r
 710                         /* The timeout has expired. */\r
 711                         prvUnlockQueue( pxQueue );\r
 712                         ( void ) xTaskResumeAll();\r
 713 \r
 714                         /* Return to the original privilege level before exiting the\r
 715                         function. */\r
 716                         traceQUEUE_SEND_FAILED( pxQueue );\r
 717                         return errQUEUE_FULL;\r
 718                 }\r
 719         }\r
 720 }\r
 721 /*-----------------------------------------------------------*/\r
 722 \r
 723 #if ( configUSE_ALTERNATIVE_API == 1 )\r
 724 \r
 725         signed portBASE_TYPE xQueueAltGenericSend( xQueueHandle xQueue, const void * const pvItemToQueue, portTickType xTicksToWait, portBASE_TYPE xCopyPosition )\r
 726         {\r
 727         signed portBASE_TYPE xEntryTimeSet = pdFALSE;\r
 728         xTimeOutType xTimeOut;\r
 729         xQUEUE * const pxQueue = ( xQUEUE * ) xQueue;\r
 730 \r
 731                 configASSERT( pxQueue );\r
 732                 configASSERT( !( ( pvItemToQueue == NULL ) && ( pxQueue->uxItemSize != ( unsigned portBASE_TYPE ) 0U ) ) );\r
 733 \r
 734                 for( ;; )\r
 735                 {\r
 736                         taskENTER_CRITICAL();\r
 737                         {\r
 738                                 /* Is there room on the queue now?  To be running we must be\r
 739                                 the highest priority task wanting to access the queue. */\r
 740                                 if( pxQueue->uxMessagesWaiting < pxQueue->uxLength )\r
 741                                 {\r
 742                                         traceQUEUE_SEND( pxQueue );\r
 743                                         prvCopyDataToQueue( pxQueue, pvItemToQueue, xCopyPosition );\r
 744 \r
 745                                         /* If there was a task waiting for data to arrive on the\r
 746                                         queue then unblock it now. */\r
 747                                         if( listLIST_IS_EMPTY( &( pxQueue->xTasksWaitingToReceive ) ) == pdFALSE )\r
 748                                         {\r
 749                                                 if( xTaskRemoveFromEventList( &( pxQueue->xTasksWaitingToReceive ) ) == pdTRUE )\r
 750                                                 {\r
 751                                                         /* The unblocked task has a priority higher than\r
 752                                                         our own so yield immediately. */\r
 753                                                         portYIELD_WITHIN_API();\r
 754                                                 }\r
 755                                         }\r
 756 \r
 757                                         taskEXIT_CRITICAL();\r
 758                                         return pdPASS;\r
 759                                 }\r
 760                                 else\r
 761                                 {\r
 762                                         if( xTicksToWait == ( portTickType ) 0 )\r
 763                                         {\r
 764                                                 taskEXIT_CRITICAL();\r
 765                                                 return errQUEUE_FULL;\r
 766                                         }\r
 767                                         else if( xEntryTimeSet == pdFALSE )\r
 768                                         {\r
 769                                                 vTaskSetTimeOutState( &xTimeOut );\r
 770                                                 xEntryTimeSet = pdTRUE;\r
 771                                         }\r
 772                                 }\r
 773                         }\r
 774                         taskEXIT_CRITICAL();\r
 775 \r
 776                         taskENTER_CRITICAL();\r
 777                         {\r
 778                                 if( xTaskCheckForTimeOut( &xTimeOut, &xTicksToWait ) == pdFALSE )\r
 779                                 {\r
 780                                         if( prvIsQueueFull( pxQueue ) != pdFALSE )\r
 781                                         {\r
 782                                                 traceBLOCKING_ON_QUEUE_SEND( pxQueue );\r
 783                                                 vTaskPlaceOnEventList( &( pxQueue->xTasksWaitingToSend ), xTicksToWait );\r
 784                                                 portYIELD_WITHIN_API();\r
 785                                         }\r
 786                                 }\r
 787                                 else\r
 788                                 {\r
 789                                         taskEXIT_CRITICAL();\r
 790                                         traceQUEUE_SEND_FAILED( pxQueue );\r
 791                                         return errQUEUE_FULL;\r
 792                                 }\r
 793                         }\r
 794                         taskEXIT_CRITICAL();\r
 795                 }\r
 796         }\r
 797 \r
 798 #endif /* configUSE_ALTERNATIVE_API */\r
 799 /*-----------------------------------------------------------*/\r
 800 \r
 801 #if ( configUSE_ALTERNATIVE_API == 1 )\r
 802 \r
 803         signed portBASE_TYPE xQueueAltGenericReceive( xQueueHandle xQueue, void * const pvBuffer, portTickType xTicksToWait, portBASE_TYPE xJustPeeking )\r
 804         {\r
 805         signed portBASE_TYPE xEntryTimeSet = pdFALSE;\r
 806         xTimeOutType xTimeOut;\r
 807         signed char *pcOriginalReadPosition;\r
 808         xQUEUE * const pxQueue = ( xQUEUE * ) xQueue;\r
 809 \r
 810                 configASSERT( pxQueue );\r
 811                 configASSERT( !( ( pvBuffer == NULL ) && ( pxQueue->uxItemSize != ( unsigned portBASE_TYPE ) 0U ) ) );\r
 812 \r
 813                 for( ;; )\r
 814                 {\r
 815                         taskENTER_CRITICAL();\r
 816                         {\r
 817                                 if( pxQueue->uxMessagesWaiting > ( unsigned portBASE_TYPE ) 0 )\r
 818                                 {\r
 819                                         /* Remember our read position in case we are just peeking. */\r
 820                                         pcOriginalReadPosition = pxQueue->u.pcReadFrom;\r
 821 \r
 822                                         prvCopyDataFromQueue( pxQueue, pvBuffer );\r
 823 \r
 824                                         if( xJustPeeking == pdFALSE )\r
 825                                         {\r
 826                                                 traceQUEUE_RECEIVE( pxQueue );\r
 827 \r
 828                                                 /* Data is actually being removed (not just peeked). */\r
 829                                                 --( pxQueue->uxMessagesWaiting );\r
 830 \r
 831                                                 #if ( configUSE_MUTEXES == 1 )\r
 832                                                 {\r
 833                                                         if( pxQueue->uxQueueType == queueQUEUE_IS_MUTEX )\r
 834                                                         {\r
 835                                                                 /* Record the information required to implement\r
 836                                                                 priority inheritance should it become necessary. */\r
 837                                                                 pxQueue->pxMutexHolder = ( void * ) xTaskGetCurrentTaskHandle();\r
 838                                                         }\r
 839                                                 }\r
 840                                                 #endif\r
 841 \r
 842                                                 if( listLIST_IS_EMPTY( &( pxQueue->xTasksWaitingToSend ) ) == pdFALSE )\r
 843                                                 {\r
 844                                                         if( xTaskRemoveFromEventList( &( pxQueue->xTasksWaitingToSend ) ) == pdTRUE )\r
 845                                                         {\r
 846                                                                 portYIELD_WITHIN_API();\r
 847                                                         }\r
 848                                                 }\r
 849                                         }\r
 850                                         else\r
 851                                         {\r
 852                                                 traceQUEUE_PEEK( pxQueue );\r
 853 \r
 854                                                 /* We are not removing the data, so reset our read\r
 855                                                 pointer. */\r
 856                                                 pxQueue->u.pcReadFrom = pcOriginalReadPosition;\r
 857 \r
 858                                                 /* The data is being left in the queue, so see if there are\r
 859                                                 any other tasks waiting for the data. */\r
 860                                                 if( listLIST_IS_EMPTY( &( pxQueue->xTasksWaitingToReceive ) ) == pdFALSE )\r
 861                                                 {\r
 862                                                         /* Tasks that are removed from the event list will get added to\r
 863                                                         the pending ready list as the scheduler is still suspended. */\r
 864                                                         if( xTaskRemoveFromEventList( &( pxQueue->xTasksWaitingToReceive ) ) != pdFALSE )\r
 865                                                         {\r
 866                                                                 /* The task waiting has a higher priority than this task. */\r
 867                                                                 portYIELD_WITHIN_API();\r
 868                                                         }\r
 869                                                 }\r
 870 \r
 871                                         }\r
 872 \r
 873                                         taskEXIT_CRITICAL();\r
 874                                         return pdPASS;\r
 875                                 }\r
 876                                 else\r
 877                                 {\r
 878                                         if( xTicksToWait == ( portTickType ) 0 )\r
 879                                         {\r
 880                                                 taskEXIT_CRITICAL();\r
 881                                                 traceQUEUE_RECEIVE_FAILED( pxQueue );\r
 882                                                 return errQUEUE_EMPTY;\r
 883                                         }\r
 884                                         else if( xEntryTimeSet == pdFALSE )\r
 885                                         {\r
 886                                                 vTaskSetTimeOutState( &xTimeOut );\r
 887                                                 xEntryTimeSet = pdTRUE;\r
 888                                         }\r
 889                                 }\r
 890                         }\r
 891                         taskEXIT_CRITICAL();\r
 892 \r
 893                         taskENTER_CRITICAL();\r
 894                         {\r
 895                                 if( xTaskCheckForTimeOut( &xTimeOut, &xTicksToWait ) == pdFALSE )\r
 896                                 {\r
 897                                         if( prvIsQueueEmpty( pxQueue ) != pdFALSE )\r
 898                                         {\r
 899                                                 traceBLOCKING_ON_QUEUE_RECEIVE( pxQueue );\r
 900 \r
 901                                                 #if ( configUSE_MUTEXES == 1 )\r
 902                                                 {\r
 903                                                         if( pxQueue->uxQueueType == queueQUEUE_IS_MUTEX )\r
 904                                                         {\r
 905                                                                 portENTER_CRITICAL();\r
 906                                                                 {\r
 907                                                                         vTaskPriorityInherit( ( void * ) pxQueue->pxMutexHolder );\r
 908                                                                 }\r
 909                                                                 portEXIT_CRITICAL();\r
 910                                                         }\r
 911                                                 }\r
 912                                                 #endif\r
 913 \r
 914                                                 vTaskPlaceOnEventList( &( pxQueue->xTasksWaitingToReceive ), xTicksToWait );\r
 915                                                 portYIELD_WITHIN_API();\r
 916                                         }\r
 917                                 }\r
 918                                 else\r
 919                                 {\r
 920                                         taskEXIT_CRITICAL();\r
 921                                         traceQUEUE_RECEIVE_FAILED( pxQueue );\r
 922                                         return errQUEUE_EMPTY;\r
 923                                 }\r
 924                         }\r
 925                         taskEXIT_CRITICAL();\r
 926                 }\r
 927         }\r
 928 \r
 929 \r
 930 #endif /* configUSE_ALTERNATIVE_API */\r
 931 /*-----------------------------------------------------------*/\r
 932 \r
 933 signed portBASE_TYPE xQueueGenericSendFromISR( xQueueHandle xQueue, const void * const pvItemToQueue, signed portBASE_TYPE *pxHigherPriorityTaskWoken, portBASE_TYPE xCopyPosition )\r
 934 {\r
 935 signed portBASE_TYPE xReturn;\r
 936 unsigned portBASE_TYPE uxSavedInterruptStatus;\r
 937 xQUEUE * const pxQueue = ( xQUEUE * ) xQueue;\r
 938 \r
 939         configASSERT( pxQueue );\r
 940         configASSERT( !( ( pvItemToQueue == NULL ) && ( pxQueue->uxItemSize != ( unsigned portBASE_TYPE ) 0U ) ) );\r
 941         configASSERT( !( ( xCopyPosition == queueOVERWRITE ) && ( pxQueue->uxLength != 1 ) ) );\r
 942 \r
 943         /* RTOS ports that support interrupt nesting have the concept of a maximum\r
 944         system call (or maximum API call) interrupt priority.  Interrupts that are\r
 945         above the maximum system call priority are keep permanently enabled, even\r
 946         when the RTOS kernel is in a critical section, but cannot make any calls to\r
 947         FreeRTOS API functions.  If configASSERT() is defined in FreeRTOSConfig.h\r
 948         then portASSERT_IF_INTERRUPT_PRIORITY_INVALID() will result in an assertion\r
 949         failure if a FreeRTOS API function is called from an interrupt that has been\r
 950         assigned a priority above the configured maximum system call priority.\r
 951         Only FreeRTOS functions that end in FromISR can be called from interrupts\r
 952         that have been assigned a priority at or (logically) below the maximum\r
 953         system call     interrupt priority.  FreeRTOS maintains a separate interrupt\r
 954         safe API to ensure interrupt entry is as fast and as simple as possible.\r
 955         More information (albeit Cortex-M specific) is provided on the following\r
 956         link: http://www.freertos.org/RTOS-Cortex-M3-M4.html */\r
 957         portASSERT_IF_INTERRUPT_PRIORITY_INVALID();\r
 958 \r
 959         /* Similar to xQueueGenericSend, except we don't block if there is no room\r
 960         in the queue.  Also we don't directly wake a task that was blocked on a\r
 961         queue read, instead we return a flag to say whether a context switch is\r
 962         required or not (i.e. has a task with a higher priority than us been woken\r
 963         by this post). */\r
 964         uxSavedInterruptStatus = portSET_INTERRUPT_MASK_FROM_ISR();\r
 965         {\r
 966                 if( ( pxQueue->uxMessagesWaiting < pxQueue->uxLength ) || ( xCopyPosition == queueOVERWRITE ) )\r
 967                 {\r
 968                         traceQUEUE_SEND_FROM_ISR( pxQueue );\r
 969 \r
 970                         prvCopyDataToQueue( pxQueue, pvItemToQueue, xCopyPosition );\r
 971 \r
 972                         /* If the queue is locked we do not alter the event list.  This will\r
 973                         be done when the queue is unlocked later. */\r
 974                         if( pxQueue->xTxLock == queueUNLOCKED )\r
 975                         {\r
 976                                 #if ( configUSE_QUEUE_SETS == 1 )\r
 977                                 {\r
 978                                         if( pxQueue->pxQueueSetContainer != NULL )\r
 979                                         {\r
 980                                                 if( prvNotifyQueueSetContainer( pxQueue, xCopyPosition ) == pdTRUE )\r
 981                                                 {\r
 982                                                         /* The queue is a member of a queue set, and posting\r
 983                                                         to the queue set caused a higher priority task to\r
 984                                                         unblock.  A context switch is required. */\r
 985                                                         if( pxHigherPriorityTaskWoken != NULL )\r
 986                                                         {\r
 987                                                                 *pxHigherPriorityTaskWoken = pdTRUE;\r
 988                                                         }\r
 989                                                 }\r
 990                                         }\r
 991                                         else\r
 992                                         {\r
 993                                                 if( listLIST_IS_EMPTY( &( pxQueue->xTasksWaitingToReceive ) ) == pdFALSE )\r
 994                                                 {\r
 995                                                         if( xTaskRemoveFromEventList( &( pxQueue->xTasksWaitingToReceive ) ) != pdFALSE )\r
 996                                                         {\r
 997                                                                 /* The task waiting has a higher priority so record that a\r
 998                                                                 context switch is required. */\r
 999                                                                 if( pxHigherPriorityTaskWoken != NULL )\r
1000                                                                 {\r
1001                                                                         *pxHigherPriorityTaskWoken = pdTRUE;\r
1002                                                                 }\r
1003                                                         }\r
1004                                                 }\r
1005                                         }\r
1006                                 }\r
1007                                 #else /* configUSE_QUEUE_SETS */\r
1008                                 {\r
1009                                         if( listLIST_IS_EMPTY( &( pxQueue->xTasksWaitingToReceive ) ) == pdFALSE )\r
1010                                         {\r
1011                                                 if( xTaskRemoveFromEventList( &( pxQueue->xTasksWaitingToReceive ) ) != pdFALSE )\r
1012                                                 {\r
1013                                                         /* The task waiting has a higher priority so record that a\r
1014                                                         context switch is required. */\r
1015                                                         if( pxHigherPriorityTaskWoken != NULL )\r
1016                                                         {\r
1017                                                                 *pxHigherPriorityTaskWoken = pdTRUE;\r
1018                                                         }\r
1019                                                 }\r
1020                                         }\r
1021                                 }\r
1022                                 #endif /* configUSE_QUEUE_SETS */\r
1023                         }\r
1024                         else\r
1025                         {\r
1026                                 /* Increment the lock count so the task that unlocks the queue\r
1027                                 knows that data was posted while it was locked. */\r
1028                                 ++( pxQueue->xTxLock );\r
1029                         }\r
1030 \r
1031                         xReturn = pdPASS;\r
1032                 }\r
1033                 else\r
1034                 {\r
1035                         traceQUEUE_SEND_FROM_ISR_FAILED( pxQueue );\r
1036                         xReturn = errQUEUE_FULL;\r
1037                 }\r
1038         }\r
1039         portCLEAR_INTERRUPT_MASK_FROM_ISR( uxSavedInterruptStatus );\r
1040 \r
1041         return xReturn;\r
1042 }\r
1043 /*-----------------------------------------------------------*/\r
1044 \r
1045 signed portBASE_TYPE xQueueGenericReceive( xQueueHandle xQueue, const void * const pvBuffer, portTickType xTicksToWait, portBASE_TYPE xJustPeeking )\r
1046 {\r
1047 signed portBASE_TYPE xEntryTimeSet = pdFALSE;\r
1048 xTimeOutType xTimeOut;\r
1049 signed char *pcOriginalReadPosition;\r
1050 xQUEUE * const pxQueue = ( xQUEUE * ) xQueue;\r
1051 \r
1052         configASSERT( pxQueue );\r
1053         configASSERT( !( ( pvBuffer == NULL ) && ( pxQueue->uxItemSize != ( unsigned portBASE_TYPE ) 0U ) ) );\r
1054 \r
1055         /* This function relaxes the coding standard somewhat to allow return\r
1056         statements within the function itself.  This is done in the interest\r
1057         of execution time efficiency. */\r
1058 \r
1059         for( ;; )\r
1060         {\r
1061                 taskENTER_CRITICAL();\r
1062                 {\r
1063                         /* Is there data in the queue now?  To be running we must be\r
1064                         the highest priority task wanting to access the queue. */\r
1065                         if( pxQueue->uxMessagesWaiting > ( unsigned portBASE_TYPE ) 0 )\r
1066                         {\r
1067                                 /* Remember the read position in case the queue is only being\r
1068                                 peeked. */\r
1069                                 pcOriginalReadPosition = pxQueue->u.pcReadFrom;\r
1070 \r
1071                                 prvCopyDataFromQueue( pxQueue, pvBuffer );\r
1072 \r
1073                                 if( xJustPeeking == pdFALSE )\r
1074                                 {\r
1075                                         traceQUEUE_RECEIVE( pxQueue );\r
1076 \r
1077                                         /* Actually removing data, not just peeking. */\r
1078                                         --( pxQueue->uxMessagesWaiting );\r
1079 \r
1080                                         #if ( configUSE_MUTEXES == 1 )\r
1081                                         {\r
1082                                                 if( pxQueue->uxQueueType == queueQUEUE_IS_MUTEX )\r
1083                                                 {\r
1084                                                         /* Record the information required to implement\r
1085                                                         priority inheritance should it become necessary. */\r
1086                                                         pxQueue->pxMutexHolder = ( void * ) xTaskGetCurrentTaskHandle(); /*lint !e961 Cast is not redundant as xTaskHandle is a typedef. */\r
1087                                                 }\r
1088                                         }\r
1089                                         #endif\r
1090 \r
1091                                         if( listLIST_IS_EMPTY( &( pxQueue->xTasksWaitingToSend ) ) == pdFALSE )\r
1092                                         {\r
1093                                                 if( xTaskRemoveFromEventList( &( pxQueue->xTasksWaitingToSend ) ) == pdTRUE )\r
1094                                                 {\r
1095                                                         portYIELD_WITHIN_API();\r
1096                                                 }\r
1097                                         }\r
1098                                 }\r
1099                                 else\r
1100                                 {\r
1101                                         traceQUEUE_PEEK( pxQueue );\r
1102 \r
1103                                         /* The data is not being removed, so reset the read\r
1104                                         pointer. */\r
1105                                         pxQueue->u.pcReadFrom = pcOriginalReadPosition;\r
1106 \r
1107                                         /* The data is being left in the queue, so see if there are\r
1108                                         any other tasks waiting for the data. */\r
1109                                         if( listLIST_IS_EMPTY( &( pxQueue->xTasksWaitingToReceive ) ) == pdFALSE )\r
1110                                         {\r
1111                                                 /* Tasks that are removed from the event list will get added to\r
1112                                                 the pending ready list as the scheduler is still suspended. */\r
1113                                                 if( xTaskRemoveFromEventList( &( pxQueue->xTasksWaitingToReceive ) ) != pdFALSE )\r
1114                                                 {\r
1115                                                         /* The task waiting has a higher priority than this task. */\r
1116                                                         portYIELD_WITHIN_API();\r
1117                                                 }\r
1118                                         }\r
1119                                 }\r
1120 \r
1121                                 taskEXIT_CRITICAL();\r
1122                                 return pdPASS;\r
1123                         }\r
1124                         else\r
1125                         {\r
1126                                 if( xTicksToWait == ( portTickType ) 0 )\r
1127                                 {\r
1128                                         /* The queue was empty and no block time is specified (or\r
1129                                         the block time has expired) so leave now. */\r
1130                                         taskEXIT_CRITICAL();\r
1131                                         traceQUEUE_RECEIVE_FAILED( pxQueue );\r
1132                                         return errQUEUE_EMPTY;\r
1133                                 }\r
1134                                 else if( xEntryTimeSet == pdFALSE )\r
1135                                 {\r
1136                                         /* The queue was empty and a block time was specified so\r
1137                                         configure the timeout structure. */\r
1138                                         vTaskSetTimeOutState( &xTimeOut );\r
1139                                         xEntryTimeSet = pdTRUE;\r
1140                                 }\r
1141                                 else\r
1142                                 {\r
1143                                         /* Entry time was already set. */\r
1144                                 }\r
1145                         }\r
1146                 }\r
1147                 taskEXIT_CRITICAL();\r
1148 \r
1149                 /* Interrupts and other tasks can send to and receive from the queue\r
1150                 now the critical section has been exited. */\r
1151 \r
1152                 vTaskSuspendAll();\r
1153                 prvLockQueue( pxQueue );\r
1154 \r
1155                 /* Update the timeout state to see if it has expired yet. */\r
1156                 if( xTaskCheckForTimeOut( &xTimeOut, &xTicksToWait ) == pdFALSE )\r
1157                 {\r
1158                         if( prvIsQueueEmpty( pxQueue ) != pdFALSE )\r
1159                         {\r
1160                                 traceBLOCKING_ON_QUEUE_RECEIVE( pxQueue );\r
1161 \r
1162                                 #if ( configUSE_MUTEXES == 1 )\r
1163                                 {\r
1164                                         if( pxQueue->uxQueueType == queueQUEUE_IS_MUTEX )\r
1165                                         {\r
1166                                                 portENTER_CRITICAL();\r
1167                                                 {\r
1168                                                         vTaskPriorityInherit( ( void * ) pxQueue->pxMutexHolder );\r
1169                                                 }\r
1170                                                 portEXIT_CRITICAL();\r
1171                                         }\r
1172                                 }\r
1173                                 #endif\r
1174 \r
1175                                 vTaskPlaceOnEventList( &( pxQueue->xTasksWaitingToReceive ), xTicksToWait );\r
1176                                 prvUnlockQueue( pxQueue );\r
1177                                 if( xTaskResumeAll() == pdFALSE )\r
1178                                 {\r
1179                                         portYIELD_WITHIN_API();\r
1180                                 }\r
1181                         }\r
1182                         else\r
1183                         {\r
1184                                 /* Try again. */\r
1185                                 prvUnlockQueue( pxQueue );\r
1186                                 ( void ) xTaskResumeAll();\r
1187                         }\r
1188                 }\r
1189                 else\r
1190                 {\r
1191                         prvUnlockQueue( pxQueue );\r
1192                         ( void ) xTaskResumeAll();\r
1193                         traceQUEUE_RECEIVE_FAILED( pxQueue );\r
1194                         return errQUEUE_EMPTY;\r
1195                 }\r
1196         }\r
1197 }\r
1198 /*-----------------------------------------------------------*/\r
1199 \r
1200 signed portBASE_TYPE xQueueReceiveFromISR( xQueueHandle xQueue, const void * const pvBuffer, signed portBASE_TYPE *pxHigherPriorityTaskWoken )\r
1201 {\r
1202 signed portBASE_TYPE xReturn;\r
1203 unsigned portBASE_TYPE uxSavedInterruptStatus;\r
1204 xQUEUE * const pxQueue = ( xQUEUE * ) xQueue;\r
1205 \r
1206         configASSERT( pxQueue );\r
1207         configASSERT( !( ( pvBuffer == NULL ) && ( pxQueue->uxItemSize != ( unsigned portBASE_TYPE ) 0U ) ) );\r
1208 \r
1209         /* RTOS ports that support interrupt nesting have the concept of a maximum\r
1210         system call (or maximum API call) interrupt priority.  Interrupts that are\r
1211         above the maximum system call priority are keep permanently enabled, even \r
1212         when the RTOS kernel is in a critical section, but cannot make any calls to\r
1213         FreeRTOS API functions.  If configASSERT() is defined in FreeRTOSConfig.h \r
1214         then portASSERT_IF_INTERRUPT_PRIORITY_INVALID() will result in an assertion\r
1215         failure if a FreeRTOS API function is called from an interrupt that has been\r
1216         assigned a priority above the configured maximum system call priority.\r
1217         Only FreeRTOS functions that end in FromISR can be called from interrupts\r
1218         that have been assigned a priority at or (logically) below the maximum \r
1219         system call     interrupt priority.  FreeRTOS maintains a separate interrupt \r
1220         safe API to ensure interrupt entry is as fast and as simple as possible.  \r
1221         More information (albeit Cortex-M specific) is provided on the following \r
1222         link: http://www.freertos.org/RTOS-Cortex-M3-M4.html */\r
1223         portASSERT_IF_INTERRUPT_PRIORITY_INVALID();\r
1224 \r
1225         uxSavedInterruptStatus = portSET_INTERRUPT_MASK_FROM_ISR();\r
1226         {\r
1227                 /* Cannot block in an ISR, so check there is data available. */\r
1228                 if( pxQueue->uxMessagesWaiting > ( unsigned portBASE_TYPE ) 0 )\r
1229                 {\r
1230                         traceQUEUE_RECEIVE_FROM_ISR( pxQueue );\r
1231 \r
1232                         prvCopyDataFromQueue( pxQueue, pvBuffer );\r
1233                         --( pxQueue->uxMessagesWaiting );\r
1234 \r
1235                         /* If the queue is locked the event list will not be modified.\r
1236                         Instead update the lock count so the task that unlocks the queue\r
1237                         will know that an ISR has removed data while the queue was\r
1238                         locked. */\r
1239                         if( pxQueue->xRxLock == queueUNLOCKED )\r
1240                         {\r
1241                                 if( listLIST_IS_EMPTY( &( pxQueue->xTasksWaitingToSend ) ) == pdFALSE )\r
1242                                 {\r
1243                                         if( xTaskRemoveFromEventList( &( pxQueue->xTasksWaitingToSend ) ) != pdFALSE )\r
1244                                         {\r
1245                                                 /* The task waiting has a higher priority than us so\r
1246                                                 force a context switch. */\r
1247                                                 if( pxHigherPriorityTaskWoken != NULL )\r
1248                                                 {\r
1249                                                         *pxHigherPriorityTaskWoken = pdTRUE;\r
1250                                                 }\r
1251                                         }\r
1252                                 }\r
1253                         }\r
1254                         else\r
1255                         {\r
1256                                 /* Increment the lock count so the task that unlocks the queue\r
1257                                 knows that data was removed while it was locked. */\r
1258                                 ++( pxQueue->xRxLock );\r
1259                         }\r
1260 \r
1261                         xReturn = pdPASS;\r
1262                 }\r
1263                 else\r
1264                 {\r
1265                         xReturn = pdFAIL;\r
1266                         traceQUEUE_RECEIVE_FROM_ISR_FAILED( pxQueue );\r
1267                 }\r
1268         }\r
1269         portCLEAR_INTERRUPT_MASK_FROM_ISR( uxSavedInterruptStatus );\r
1270 \r
1271         return xReturn;\r
1272 }\r
1273 /*-----------------------------------------------------------*/\r
1274 \r
1275 signed portBASE_TYPE xQueuePeekFromISR( xQueueHandle xQueue, const void * const pvBuffer )\r
1276 {\r
1277 signed portBASE_TYPE xReturn;\r
1278 unsigned portBASE_TYPE uxSavedInterruptStatus;\r
1279 signed char *pcOriginalReadPosition;\r
1280 xQUEUE * const pxQueue = ( xQUEUE * ) xQueue;\r
1281 \r
1282         configASSERT( pxQueue );\r
1283         configASSERT( !( ( pvBuffer == NULL ) && ( pxQueue->uxItemSize != ( unsigned portBASE_TYPE ) 0U ) ) );\r
1284 \r
1285         /* RTOS ports that support interrupt nesting have the concept of a maximum\r
1286         system call (or maximum API call) interrupt priority.  Interrupts that are\r
1287         above the maximum system call priority are keep permanently enabled, even \r
1288         when the RTOS kernel is in a critical section, but cannot make any calls to\r
1289         FreeRTOS API functions.  If configASSERT() is defined in FreeRTOSConfig.h \r
1290         then portASSERT_IF_INTERRUPT_PRIORITY_INVALID() will result in an assertion\r
1291         failure if a FreeRTOS API function is called from an interrupt that has been\r
1292         assigned a priority above the configured maximum system call priority.\r
1293         Only FreeRTOS functions that end in FromISR can be called from interrupts\r
1294         that have been assigned a priority at or (logically) below the maximum \r
1295         system call     interrupt priority.  FreeRTOS maintains a separate interrupt \r
1296         safe API to ensure interrupt entry is as fast and as simple as possible.  \r
1297         More information (albeit Cortex-M specific) is provided on the following \r
1298         link: http://www.freertos.org/RTOS-Cortex-M3-M4.html */\r
1299         portASSERT_IF_INTERRUPT_PRIORITY_INVALID();\r
1300 \r
1301         uxSavedInterruptStatus = portSET_INTERRUPT_MASK_FROM_ISR();\r
1302         {\r
1303                 /* Cannot block in an ISR, so check there is data available. */\r
1304                 if( pxQueue->uxMessagesWaiting > ( unsigned portBASE_TYPE ) 0 )\r
1305                 {\r
1306                         traceQUEUE_PEEK_FROM_ISR( pxQueue );\r
1307 \r
1308                         /* Remember the read position so it can be reset as nothing is\r
1309                         actually being removed from the queue. */\r
1310                         pcOriginalReadPosition = pxQueue->u.pcReadFrom;\r
1311                         prvCopyDataFromQueue( pxQueue, pvBuffer );\r
1312                         pxQueue->u.pcReadFrom = pcOriginalReadPosition;\r
1313 \r
1314                         xReturn = pdPASS;\r
1315                 }\r
1316                 else\r
1317                 {\r
1318                         xReturn = pdFAIL;\r
1319                         traceQUEUE_PEEK_FROM_ISR_FAILED( pxQueue );\r
1320                 }\r
1321         }\r
1322         portCLEAR_INTERRUPT_MASK_FROM_ISR( uxSavedInterruptStatus );\r
1323 \r
1324         return xReturn;\r
1325 }\r
1326 /*-----------------------------------------------------------*/\r
1327 \r
1328 unsigned portBASE_TYPE uxQueueMessagesWaiting( const xQueueHandle xQueue )\r
1329 {\r
1330 unsigned portBASE_TYPE uxReturn;\r
1331 \r
1332         configASSERT( xQueue );\r
1333 \r
1334         taskENTER_CRITICAL();\r
1335                 uxReturn = ( ( xQUEUE * ) xQueue )->uxMessagesWaiting;\r
1336         taskEXIT_CRITICAL();\r
1337 \r
1338         return uxReturn;\r
1339 } /*lint !e818 Pointer cannot be declared const as xQueue is a typedef not pointer. */\r
1340 /*-----------------------------------------------------------*/\r
1341 \r
1342 unsigned portBASE_TYPE uxQueueMessagesWaitingFromISR( const xQueueHandle xQueue )\r
1343 {\r
1344 unsigned portBASE_TYPE uxReturn;\r
1345 \r
1346         configASSERT( xQueue );\r
1347 \r
1348         uxReturn = ( ( xQUEUE * ) xQueue )->uxMessagesWaiting;\r
1349 \r
1350         return uxReturn;\r
1351 } /*lint !e818 Pointer cannot be declared const as xQueue is a typedef not pointer. */\r
1352 /*-----------------------------------------------------------*/\r
1353 \r
1354 void vQueueDelete( xQueueHandle xQueue )\r
1355 {\r
1356 xQUEUE * const pxQueue = ( xQUEUE * ) xQueue;\r
1357 \r
1358         configASSERT( pxQueue );\r
1359 \r
1360         traceQUEUE_DELETE( pxQueue );\r
1361         #if ( configQUEUE_REGISTRY_SIZE > 0 )\r
1362         {\r
1363                 vQueueUnregisterQueue( pxQueue );\r
1364         }\r
1365         #endif\r
1366         vPortFree( pxQueue->pcHead );\r
1367         vPortFree( pxQueue );\r
1368 }\r
1369 /*-----------------------------------------------------------*/\r
1370 \r
1371 #if ( configUSE_TRACE_FACILITY == 1 )\r
1372 \r
1373         unsigned char ucQueueGetQueueNumber( xQueueHandle xQueue )\r
1374         {\r
1375                 return ( ( xQUEUE * ) xQueue )->ucQueueNumber;\r
1376         }\r
1377 \r
1378 #endif /* configUSE_TRACE_FACILITY */\r
1379 /*-----------------------------------------------------------*/\r
1380 \r
1381 #if ( configUSE_TRACE_FACILITY == 1 )\r
1382 \r
1383         void vQueueSetQueueNumber( xQueueHandle xQueue, unsigned char ucQueueNumber )\r
1384         {\r
1385                 ( ( xQUEUE * ) xQueue )->ucQueueNumber = ucQueueNumber;\r
1386         }\r
1387 \r
1388 #endif /* configUSE_TRACE_FACILITY */\r
1389 /*-----------------------------------------------------------*/\r
1390 \r
1391 #if ( configUSE_TRACE_FACILITY == 1 )\r
1392 \r
1393         unsigned char ucQueueGetQueueType( xQueueHandle xQueue )\r
1394         {\r
1395                 return ( ( xQUEUE * ) xQueue )->ucQueueType;\r
1396         }\r
1397 \r
1398 #endif /* configUSE_TRACE_FACILITY */\r
1399 /*-----------------------------------------------------------*/\r
1400 \r
1401 static void prvCopyDataToQueue( xQUEUE *pxQueue, const void *pvItemToQueue, portBASE_TYPE xPosition )\r
1402 {\r
1403         if( pxQueue->uxItemSize == ( unsigned portBASE_TYPE ) 0 )\r
1404         {\r
1405                 #if ( configUSE_MUTEXES == 1 )\r
1406                 {\r
1407                         if( pxQueue->uxQueueType == queueQUEUE_IS_MUTEX )\r
1408                         {\r
1409                                 /* The mutex is no longer being held. */\r
1410                                 vTaskPriorityDisinherit( ( void * ) pxQueue->pxMutexHolder );\r
1411                                 pxQueue->pxMutexHolder = NULL;\r
1412                         }\r
1413                 }\r
1414                 #endif /* configUSE_MUTEXES */\r
1415         }\r
1416         else if( xPosition == queueSEND_TO_BACK )\r
1417         {\r
1418                 ( void ) memcpy( ( void * ) pxQueue->pcWriteTo, pvItemToQueue, ( size_t ) pxQueue->uxItemSize ); /*lint !e961 !e418 MISRA exception as the casts are only redundant for some ports, plus previous logic ensures a null pointer can only be passed to memcpy() if the copy size is 0. */\r
1419                 pxQueue->pcWriteTo += pxQueue->uxItemSize;\r
1420                 if( pxQueue->pcWriteTo >= pxQueue->pcTail ) /*lint !e946 MISRA exception justified as comparison of pointers is the cleanest solution. */\r
1421                 {\r
1422                         pxQueue->pcWriteTo = pxQueue->pcHead;\r
1423                 }\r
1424         }\r
1425         else\r
1426         {\r
1427                 ( void ) memcpy( ( void * ) pxQueue->u.pcReadFrom, pvItemToQueue, ( size_t ) pxQueue->uxItemSize ); /*lint !e961 MISRA exception as the casts are only redundant for some ports. */\r
1428                 pxQueue->u.pcReadFrom -= pxQueue->uxItemSize;\r
1429                 if( pxQueue->u.pcReadFrom < pxQueue->pcHead ) /*lint !e946 MISRA exception justified as comparison of pointers is the cleanest solution. */\r
1430                 {\r
1431                         pxQueue->u.pcReadFrom = ( pxQueue->pcTail - pxQueue->uxItemSize );\r
1432                 }\r
1433 \r
1434                 if( xPosition == queueOVERWRITE )\r
1435                 {\r
1436                         if( pxQueue->uxMessagesWaiting > ( unsigned portBASE_TYPE ) 0 )\r
1437                         {\r
1438                                 /* An item is not being added but overwritten, so subtract\r
1439                                 one from the recorded number of items in the queue so when\r
1440                                 one is added again below the number of recorded items remains\r
1441                                 correct. */\r
1442                                 --( pxQueue->uxMessagesWaiting );\r
1443                         }\r
1444                 }\r
1445         }\r
1446 \r
1447         ++( pxQueue->uxMessagesWaiting );\r
1448 }\r
1449 /*-----------------------------------------------------------*/\r
1450 \r
1451 static void prvCopyDataFromQueue( xQUEUE * const pxQueue, const void * const pvBuffer )\r
1452 {\r
1453         if( pxQueue->uxQueueType != queueQUEUE_IS_MUTEX )\r
1454         {\r
1455                 pxQueue->u.pcReadFrom += pxQueue->uxItemSize;\r
1456                 if( pxQueue->u.pcReadFrom >= pxQueue->pcTail ) /*lint !e946 MISRA exception justified as use of the relational operator is the cleanest solutions. */\r
1457                 {\r
1458                         pxQueue->u.pcReadFrom = pxQueue->pcHead;\r
1459                 }\r
1460                 ( void ) memcpy( ( void * ) pvBuffer, ( void * ) pxQueue->u.pcReadFrom, ( size_t ) pxQueue->uxItemSize ); /*lint !e961 !e418 MISRA exception as the casts are only redundant for some ports.  Also previous logic ensures a null pointer can only be passed to memcpy() when the count is 0. */\r
1461         }\r
1462 }\r
1463 /*-----------------------------------------------------------*/\r
1464 \r
1465 static void prvUnlockQueue( xQUEUE *pxQueue )\r
1466 {\r
1467         /* THIS FUNCTION MUST BE CALLED WITH THE SCHEDULER SUSPENDED. */\r
1468 \r
1469         /* The lock counts contains the number of extra data items placed or\r
1470         removed from the queue while the queue was locked.  When a queue is\r
1471         locked items can be added or removed, but the event lists cannot be\r
1472         updated. */\r
1473         taskENTER_CRITICAL();\r
1474         {\r
1475                 /* See if data was added to the queue while it was locked. */\r
1476                 while( pxQueue->xTxLock > queueLOCKED_UNMODIFIED )\r
1477                 {\r
1478                         /* Data was posted while the queue was locked.  Are any tasks\r
1479                         blocked waiting for data to become available? */\r
1480                         #if ( configUSE_QUEUE_SETS == 1 )\r
1481                         {\r
1482                                 if( pxQueue->pxQueueSetContainer != NULL )\r
1483                                 {\r
1484                                         if( prvNotifyQueueSetContainer( pxQueue, queueSEND_TO_BACK ) == pdTRUE )\r
1485                                         {\r
1486                                                 /* The queue is a member of a queue set, and posting to\r
1487                                                 the queue set caused a higher priority task to unblock.\r
1488                                                 A context switch is required. */\r
1489                                                 vTaskMissedYield();\r
1490                                         }\r
1491                                 }\r
1492                                 else\r
1493                                 {\r
1494                                         /* Tasks that are removed from the event list will get added to\r
1495                                         the pending ready list as the scheduler is still suspended. */\r
1496                                         if( listLIST_IS_EMPTY( &( pxQueue->xTasksWaitingToReceive ) ) == pdFALSE )\r
1497                                         {\r
1498                                                 if( xTaskRemoveFromEventList( &( pxQueue->xTasksWaitingToReceive ) ) != pdFALSE )\r
1499                                                 {\r
1500                                                         /* The task waiting has a higher priority so record that a\r
1501                                                         context switch is required. */\r
1502                                                         vTaskMissedYield();\r
1503                                                 }\r
1504                                         }\r
1505                                         else\r
1506                                         {\r
1507                                                 break;\r
1508                                         }\r
1509                                 }\r
1510                         }\r
1511                         #else /* configUSE_QUEUE_SETS */\r
1512                         {\r
1513                                 /* Tasks that are removed from the event list will get added to\r
1514                                 the pending ready list as the scheduler is still suspended. */\r
1515                                 if( listLIST_IS_EMPTY( &( pxQueue->xTasksWaitingToReceive ) ) == pdFALSE )\r
1516                                 {\r
1517                                         if( xTaskRemoveFromEventList( &( pxQueue->xTasksWaitingToReceive ) ) != pdFALSE )\r
1518                                         {\r
1519                                                 /* The task waiting has a higher priority so record that a\r
1520                                                 context switch is required. */\r
1521                                                 vTaskMissedYield();\r
1522                                         }\r
1523                                 }\r
1524                                 else\r
1525                                 {\r
1526                                         break;\r
1527                                 }\r
1528                         }\r
1529                         #endif /* configUSE_QUEUE_SETS */\r
1530 \r
1531                         --( pxQueue->xTxLock );\r
1532                 }\r
1533 \r
1534                 pxQueue->xTxLock = queueUNLOCKED;\r
1535         }\r
1536         taskEXIT_CRITICAL();\r
1537 \r
1538         /* Do the same for the Rx lock. */\r
1539         taskENTER_CRITICAL();\r
1540         {\r
1541                 while( pxQueue->xRxLock > queueLOCKED_UNMODIFIED )\r
1542                 {\r
1543                         if( listLIST_IS_EMPTY( &( pxQueue->xTasksWaitingToSend ) ) == pdFALSE )\r
1544                         {\r
1545                                 if( xTaskRemoveFromEventList( &( pxQueue->xTasksWaitingToSend ) ) != pdFALSE )\r
1546                                 {\r
1547                                         vTaskMissedYield();\r
1548                                 }\r
1549 \r
1550                                 --( pxQueue->xRxLock );\r
1551                         }\r
1552                         else\r
1553                         {\r
1554                                 break;\r
1555                         }\r
1556                 }\r
1557 \r
1558                 pxQueue->xRxLock = queueUNLOCKED;\r
1559         }\r
1560         taskEXIT_CRITICAL();\r
1561 }\r
1562 /*-----------------------------------------------------------*/\r
1563 \r
1564 static signed portBASE_TYPE prvIsQueueEmpty( const xQUEUE *pxQueue )\r
1565 {\r
1566 signed portBASE_TYPE xReturn;\r
1567 \r
1568         taskENTER_CRITICAL();\r
1569         {\r
1570                 if( pxQueue->uxMessagesWaiting == ( unsigned portBASE_TYPE )  0 )\r
1571                 {\r
1572                         xReturn = pdTRUE;\r
1573                 }\r
1574                 else\r
1575                 {\r
1576                         xReturn = pdFALSE;\r
1577                 }\r
1578         }\r
1579         taskEXIT_CRITICAL();\r
1580 \r
1581         return xReturn;\r
1582 }\r
1583 /*-----------------------------------------------------------*/\r
1584 \r
1585 signed portBASE_TYPE xQueueIsQueueEmptyFromISR( const xQueueHandle xQueue )\r
1586 {\r
1587 signed portBASE_TYPE xReturn;\r
1588 \r
1589         configASSERT( xQueue );\r
1590         if( ( ( xQUEUE * ) xQueue )->uxMessagesWaiting == ( unsigned portBASE_TYPE ) 0 )\r
1591         {\r
1592                 xReturn = pdTRUE;\r
1593         }\r
1594         else\r
1595         {\r
1596                 xReturn = pdFALSE;\r
1597         }\r
1598 \r
1599         return xReturn;\r
1600 } /*lint !e818 xQueue could not be pointer to const because it is a typedef. */\r
1601 /*-----------------------------------------------------------*/\r
1602 \r
1603 static signed portBASE_TYPE prvIsQueueFull( const xQUEUE *pxQueue )\r
1604 {\r
1605 signed portBASE_TYPE xReturn;\r
1606 \r
1607         taskENTER_CRITICAL();\r
1608         {\r
1609                 if( pxQueue->uxMessagesWaiting == pxQueue->uxLength )\r
1610                 {\r
1611                         xReturn = pdTRUE;\r
1612                 }\r
1613                 else\r
1614                 {\r
1615                         xReturn = pdFALSE;\r
1616                 }\r
1617         }\r
1618         taskEXIT_CRITICAL();\r
1619 \r
1620         return xReturn;\r
1621 }\r
1622 /*-----------------------------------------------------------*/\r
1623 \r
1624 signed portBASE_TYPE xQueueIsQueueFullFromISR( const xQueueHandle xQueue )\r
1625 {\r
1626 signed portBASE_TYPE xReturn;\r
1627 \r
1628         configASSERT( xQueue );\r
1629         if( ( ( xQUEUE * ) xQueue )->uxMessagesWaiting == ( ( xQUEUE * ) xQueue )->uxLength )\r
1630         {\r
1631                 xReturn = pdTRUE;\r
1632         }\r
1633         else\r
1634         {\r
1635                 xReturn = pdFALSE;\r
1636         }\r
1637 \r
1638         return xReturn;\r
1639 } /*lint !e818 xQueue could not be pointer to const because it is a typedef. */\r
1640 /*-----------------------------------------------------------*/\r
1641 \r
1642 #if ( configUSE_CO_ROUTINES == 1 )\r
1643 \r
1644         signed portBASE_TYPE xQueueCRSend( xQueueHandle xQueue, const void *pvItemToQueue, portTickType xTicksToWait )\r
1645         {\r
1646         signed portBASE_TYPE xReturn;\r
1647         xQUEUE * const pxQueue = ( xQUEUE * ) xQueue;\r
1648 \r
1649                 /* If the queue is already full we may have to block.  A critical section\r
1650                 is required to prevent an interrupt removing something from the queue\r
1651                 between the check to see if the queue is full and blocking on the queue. */\r
1652                 portDISABLE_INTERRUPTS();\r
1653                 {\r
1654                         if( prvIsQueueFull( pxQueue ) != pdFALSE )\r
1655                         {\r
1656                                 /* The queue is full - do we want to block or just leave without\r
1657                                 posting? */\r
1658                                 if( xTicksToWait > ( portTickType ) 0 )\r
1659                                 {\r
1660                                         /* As this is called from a coroutine we cannot block directly, but\r
1661                                         return indicating that we need to block. */\r
1662                                         vCoRoutineAddToDelayedList( xTicksToWait, &( pxQueue->xTasksWaitingToSend ) );\r
1663                                         portENABLE_INTERRUPTS();\r
1664                                         return errQUEUE_BLOCKED;\r
1665                                 }\r
1666                                 else\r
1667                                 {\r
1668                                         portENABLE_INTERRUPTS();\r
1669                                         return errQUEUE_FULL;\r
1670                                 }\r
1671                         }\r
1672                 }\r
1673                 portENABLE_INTERRUPTS();\r
1674 \r
1675                 portDISABLE_INTERRUPTS();\r
1676                 {\r
1677                         if( pxQueue->uxMessagesWaiting < pxQueue->uxLength )\r
1678                         {\r
1679                                 /* There is room in the queue, copy the data into the queue. */\r
1680                                 prvCopyDataToQueue( pxQueue, pvItemToQueue, queueSEND_TO_BACK );\r
1681                                 xReturn = pdPASS;\r
1682 \r
1683                                 /* Were any co-routines waiting for data to become available? */\r
1684                                 if( listLIST_IS_EMPTY( &( pxQueue->xTasksWaitingToReceive ) ) == pdFALSE )\r
1685                                 {\r
1686                                         /* In this instance the co-routine could be placed directly\r
1687                                         into the ready list as we are within a critical section.\r
1688                                         Instead the same pending ready list mechanism is used as if\r
1689                                         the event were caused from within an interrupt. */\r
1690                                         if( xCoRoutineRemoveFromEventList( &( pxQueue->xTasksWaitingToReceive ) ) != pdFALSE )\r
1691                                         {\r
1692                                                 /* The co-routine waiting has a higher priority so record\r
1693                                                 that a yield might be appropriate. */\r
1694                                                 xReturn = errQUEUE_YIELD;\r
1695                                         }\r
1696                                 }\r
1697                         }\r
1698                         else\r
1699                         {\r
1700                                 xReturn = errQUEUE_FULL;\r
1701                         }\r
1702                 }\r
1703                 portENABLE_INTERRUPTS();\r
1704 \r
1705                 return xReturn;\r
1706         }\r
1707 \r
1708 #endif /* configUSE_CO_ROUTINES */\r
1709 /*-----------------------------------------------------------*/\r
1710 \r
1711 #if ( configUSE_CO_ROUTINES == 1 )\r
1712 \r
1713         signed portBASE_TYPE xQueueCRReceive( xQueueHandle xQueue, void *pvBuffer, portTickType xTicksToWait )\r
1714         {\r
1715         signed portBASE_TYPE xReturn;\r
1716         xQUEUE * const pxQueue = ( xQUEUE * ) xQueue;\r
1717 \r
1718                 /* If the queue is already empty we may have to block.  A critical section\r
1719                 is required to prevent an interrupt adding something to the queue\r
1720                 between the check to see if the queue is empty and blocking on the queue. */\r
1721                 portDISABLE_INTERRUPTS();\r
1722                 {\r
1723                         if( pxQueue->uxMessagesWaiting == ( unsigned portBASE_TYPE ) 0 )\r
1724                         {\r
1725                                 /* There are no messages in the queue, do we want to block or just\r
1726                                 leave with nothing? */\r
1727                                 if( xTicksToWait > ( portTickType ) 0 )\r
1728                                 {\r
1729                                         /* As this is a co-routine we cannot block directly, but return\r
1730                                         indicating that we need to block. */\r
1731                                         vCoRoutineAddToDelayedList( xTicksToWait, &( pxQueue->xTasksWaitingToReceive ) );\r
1732                                         portENABLE_INTERRUPTS();\r
1733                                         return errQUEUE_BLOCKED;\r
1734                                 }\r
1735                                 else\r
1736                                 {\r
1737                                         portENABLE_INTERRUPTS();\r
1738                                         return errQUEUE_FULL;\r
1739                                 }\r
1740                         }\r
1741                 }\r
1742                 portENABLE_INTERRUPTS();\r
1743 \r
1744                 portDISABLE_INTERRUPTS();\r
1745                 {\r
1746                         if( pxQueue->uxMessagesWaiting > ( unsigned portBASE_TYPE ) 0 )\r
1747                         {\r
1748                                 /* Data is available from the queue. */\r
1749                                 pxQueue->u.pcReadFrom += pxQueue->uxItemSize;\r
1750                                 if( pxQueue->u.pcReadFrom >= pxQueue->pcTail )\r
1751                                 {\r
1752                                         pxQueue->u.pcReadFrom = pxQueue->pcHead;\r
1753                                 }\r
1754                                 --( pxQueue->uxMessagesWaiting );\r
1755                                 memcpy( ( void * ) pvBuffer, ( void * ) pxQueue->u.pcReadFrom, ( unsigned ) pxQueue->uxItemSize );\r
1756 \r
1757                                 xReturn = pdPASS;\r
1758 \r
1759                                 /* Were any co-routines waiting for space to become available? */\r
1760                                 if( listLIST_IS_EMPTY( &( pxQueue->xTasksWaitingToSend ) ) == pdFALSE )\r
1761                                 {\r
1762                                         /* In this instance the co-routine could be placed directly\r
1763                                         into the ready list as we are within a critical section.\r
1764                                         Instead the same pending ready list mechanism is used as if\r
1765                                         the event were caused from within an interrupt. */\r
1766                                         if( xCoRoutineRemoveFromEventList( &( pxQueue->xTasksWaitingToSend ) ) != pdFALSE )\r
1767                                         {\r
1768                                                 xReturn = errQUEUE_YIELD;\r
1769                                         }\r
1770                                 }\r
1771                         }\r
1772                         else\r
1773                         {\r
1774                                 xReturn = pdFAIL;\r
1775                         }\r
1776                 }\r
1777                 portENABLE_INTERRUPTS();\r
1778 \r
1779                 return xReturn;\r
1780         }\r
1781 \r
1782 #endif /* configUSE_CO_ROUTINES */\r
1783 /*-----------------------------------------------------------*/\r
1784 \r
1785 #if ( configUSE_CO_ROUTINES == 1 )\r
1786 \r
1787         signed portBASE_TYPE xQueueCRSendFromISR( xQueueHandle xQueue, const void *pvItemToQueue, signed portBASE_TYPE xCoRoutinePreviouslyWoken )\r
1788         {\r
1789         xQUEUE * const pxQueue = ( xQUEUE * ) xQueue;\r
1790 \r
1791                 /* Cannot block within an ISR so if there is no space on the queue then\r
1792                 exit without doing anything. */\r
1793                 if( pxQueue->uxMessagesWaiting < pxQueue->uxLength )\r
1794                 {\r
1795                         prvCopyDataToQueue( pxQueue, pvItemToQueue, queueSEND_TO_BACK );\r
1796 \r
1797                         /* We only want to wake one co-routine per ISR, so check that a\r
1798                         co-routine has not already been woken. */\r
1799                         if( xCoRoutinePreviouslyWoken == pdFALSE )\r
1800                         {\r
1801                                 if( listLIST_IS_EMPTY( &( pxQueue->xTasksWaitingToReceive ) ) == pdFALSE )\r
1802                                 {\r
1803                                         if( xCoRoutineRemoveFromEventList( &( pxQueue->xTasksWaitingToReceive ) ) != pdFALSE )\r
1804                                         {\r
1805                                                 return pdTRUE;\r
1806                                         }\r
1807                                 }\r
1808                         }\r
1809                 }\r
1810 \r
1811                 return xCoRoutinePreviouslyWoken;\r
1812         }\r
1813 \r
1814 #endif /* configUSE_CO_ROUTINES */\r
1815 /*-----------------------------------------------------------*/\r
1816 \r
1817 #if ( configUSE_CO_ROUTINES == 1 )\r
1818 \r
1819         signed portBASE_TYPE xQueueCRReceiveFromISR( xQueueHandle xQueue, void *pvBuffer, signed portBASE_TYPE *pxCoRoutineWoken )\r
1820         {\r
1821         signed portBASE_TYPE xReturn;\r
1822         xQUEUE * const pxQueue = ( xQUEUE * ) xQueue;\r
1823 \r
1824                 /* We cannot block from an ISR, so check there is data available. If\r
1825                 not then just leave without doing anything. */\r
1826                 if( pxQueue->uxMessagesWaiting > ( unsigned portBASE_TYPE ) 0 )\r
1827                 {\r
1828                         /* Copy the data from the queue. */\r
1829                         pxQueue->u.pcReadFrom += pxQueue->uxItemSize;\r
1830                         if( pxQueue->u.pcReadFrom >= pxQueue->pcTail )\r
1831                         {\r
1832                                 pxQueue->u.pcReadFrom = pxQueue->pcHead;\r
1833                         }\r
1834                         --( pxQueue->uxMessagesWaiting );\r
1835                         memcpy( ( void * ) pvBuffer, ( void * ) pxQueue->u.pcReadFrom, ( unsigned ) pxQueue->uxItemSize );\r
1836 \r
1837                         if( ( *pxCoRoutineWoken ) == pdFALSE )\r
1838                         {\r
1839                                 if( listLIST_IS_EMPTY( &( pxQueue->xTasksWaitingToSend ) ) == pdFALSE )\r
1840                                 {\r
1841                                         if( xCoRoutineRemoveFromEventList( &( pxQueue->xTasksWaitingToSend ) ) != pdFALSE )\r
1842                                         {\r
1843                                                 *pxCoRoutineWoken = pdTRUE;\r
1844                                         }\r
1845                                 }\r
1846                         }\r
1847 \r
1848                         xReturn = pdPASS;\r
1849                 }\r
1850                 else\r
1851                 {\r
1852                         xReturn = pdFAIL;\r
1853                 }\r
1854 \r
1855                 return xReturn;\r
1856         }\r
1857 \r
1858 #endif /* configUSE_CO_ROUTINES */\r
1859 /*-----------------------------------------------------------*/\r
1860 \r
1861 #if ( configQUEUE_REGISTRY_SIZE > 0 )\r
1862 \r
1863         void vQueueAddToRegistry( xQueueHandle xQueue, signed char *pcQueueName )\r
1864         {\r
1865         unsigned portBASE_TYPE ux;\r
1866 \r
1867                 /* See if there is an empty space in the registry.  A NULL name denotes\r
1868                 a free slot. */\r
1869                 for( ux = ( unsigned portBASE_TYPE ) 0U; ux < ( unsigned portBASE_TYPE ) configQUEUE_REGISTRY_SIZE; ux++ )\r
1870                 {\r
1871                         if( xQueueRegistry[ ux ].pcQueueName == NULL )\r
1872                         {\r
1873                                 /* Store the information on this queue. */\r
1874                                 xQueueRegistry[ ux ].pcQueueName = pcQueueName;\r
1875                                 xQueueRegistry[ ux ].xHandle = xQueue;\r
1876                                 break;\r
1877                         }\r
1878                 }\r
1879         }\r
1880 \r
1881 #endif /* configQUEUE_REGISTRY_SIZE */\r
1882 /*-----------------------------------------------------------*/\r
1883 \r
1884 #if ( configQUEUE_REGISTRY_SIZE > 0 )\r
1885 \r
1886         void vQueueUnregisterQueue( xQueueHandle xQueue )\r
1887         {\r
1888         unsigned portBASE_TYPE ux;\r
1889 \r
1890                 /* See if the handle of the queue being unregistered in actually in the\r
1891                 registry. */\r
1892                 for( ux = ( unsigned portBASE_TYPE ) 0U; ux < ( unsigned portBASE_TYPE ) configQUEUE_REGISTRY_SIZE; ux++ )\r
1893                 {\r
1894                         if( xQueueRegistry[ ux ].xHandle == xQueue )\r
1895                         {\r
1896                                 /* Set the name to NULL to show that this slot if free again. */\r
1897                                 xQueueRegistry[ ux ].pcQueueName = NULL;\r
1898                                 break;\r
1899                         }\r
1900                 }\r
1901 \r
1902         } /*lint !e818 xQueue could not be pointer to const because it is a typedef. */\r
1903 \r
1904 #endif /* configQUEUE_REGISTRY_SIZE */\r
1905 /*-----------------------------------------------------------*/\r
1906 \r
1907 #if ( configUSE_TIMERS == 1 )\r
1908 \r
1909         void vQueueWaitForMessageRestricted( xQueueHandle xQueue, portTickType xTicksToWait )\r
1910         {\r
1911         xQUEUE * const pxQueue = ( xQUEUE * ) xQueue;\r
1912 \r
1913                 /* This function should not be called by application code hence the\r
1914                 'Restricted' in its name.  It is not part of the public API.  It is\r
1915                 designed for use by kernel code, and has special calling requirements.\r
1916                 It can result in vListInsert() being called on a list that can only\r
1917                 possibly ever have one item in it, so the list will be fast, but even\r
1918                 so it should be called with the scheduler locked and not from a critical\r
1919                 section. */\r
1920 \r
1921                 /* Only do anything if there are no messages in the queue.  This function\r
1922                 will not actually cause the task to block, just place it on a blocked\r
1923                 list.  It will not block until the scheduler is unlocked - at which\r
1924                 time a yield will be performed.  If an item is added to the queue while\r
1925                 the queue is locked, and the calling task blocks on the queue, then the\r
1926                 calling task will be immediately unblocked when the queue is unlocked. */\r
1927                 prvLockQueue( pxQueue );\r
1928                 if( pxQueue->uxMessagesWaiting == ( unsigned portBASE_TYPE ) 0U )\r
1929                 {\r
1930                         /* There is nothing in the queue, block for the specified period. */\r
1931                         vTaskPlaceOnEventListRestricted( &( pxQueue->xTasksWaitingToReceive ), xTicksToWait );\r
1932                 }\r
1933                 prvUnlockQueue( pxQueue );\r
1934         }\r
1935 \r
1936 #endif /* configUSE_TIMERS */\r
1937 /*-----------------------------------------------------------*/\r
1938 \r
1939 #if ( configUSE_QUEUE_SETS == 1 )\r
1940 \r
1941         xQueueSetHandle xQueueCreateSet( unsigned portBASE_TYPE uxEventQueueLength )\r
1942         {\r
1943         xQueueSetHandle pxQueue;\r
1944 \r
1945                 pxQueue = xQueueGenericCreate( uxEventQueueLength, sizeof( xQUEUE * ), queueQUEUE_TYPE_SET );\r
1946 \r
1947                 return pxQueue;\r
1948         }\r
1949 \r
1950 #endif /* configUSE_QUEUE_SETS */\r
1951 /*-----------------------------------------------------------*/\r
1952 \r
1953 #if ( configUSE_QUEUE_SETS == 1 )\r
1954 \r
1955         portBASE_TYPE xQueueAddToSet( xQueueSetMemberHandle xQueueOrSemaphore, xQueueSetHandle xQueueSet )\r
1956         {\r
1957         portBASE_TYPE xReturn;\r
1958 \r
1959                 if( ( ( xQUEUE * ) xQueueOrSemaphore )->pxQueueSetContainer != NULL )\r
1960                 {\r
1961                         /* Cannot add a queue/semaphore to more than one queue set. */\r
1962                         xReturn = pdFAIL;\r
1963                 }\r
1964                 else if( ( ( xQUEUE * ) xQueueOrSemaphore )->uxMessagesWaiting != ( unsigned portBASE_TYPE ) 0 )\r
1965                 {\r
1966                         /* Cannot add a queue/semaphore to a queue set if there are already\r
1967                         items in the queue/semaphore. */\r
1968                         xReturn = pdFAIL;\r
1969                 }\r
1970                 else\r
1971                 {\r
1972                         taskENTER_CRITICAL();\r
1973                         {\r
1974                                 ( ( xQUEUE * ) xQueueOrSemaphore )->pxQueueSetContainer = xQueueSet;\r
1975                         }\r
1976                         taskEXIT_CRITICAL();\r
1977                         xReturn = pdPASS;\r
1978                 }\r
1979 \r
1980                 return xReturn;\r
1981         }\r
1982 \r
1983 #endif /* configUSE_QUEUE_SETS */\r
1984 /*-----------------------------------------------------------*/\r
1985 \r
1986 #if ( configUSE_QUEUE_SETS == 1 )\r
1987 \r
1988         portBASE_TYPE xQueueRemoveFromSet( xQueueSetMemberHandle xQueueOrSemaphore, xQueueSetHandle xQueueSet )\r
1989         {\r
1990         portBASE_TYPE xReturn;\r
1991         xQUEUE * const pxQueueOrSemaphore = ( xQUEUE * ) xQueueOrSemaphore;\r
1992 \r
1993                 if( pxQueueOrSemaphore->pxQueueSetContainer != xQueueSet )\r
1994                 {\r
1995                         /* The queue was not a member of the set. */\r
1996                         xReturn = pdFAIL;\r
1997                 }\r
1998                 else if( pxQueueOrSemaphore->uxMessagesWaiting != ( unsigned portBASE_TYPE ) 0 )\r
1999                 {\r
2000                         /* It is dangerous to remove a queue from a set when the queue is\r
2001                         not empty because the queue set will still hold pending events for\r
2002                         the queue. */\r
2003                         xReturn = pdFAIL;\r
2004                 }\r
2005                 else\r
2006                 {\r
2007                         taskENTER_CRITICAL();\r
2008                         {\r
2009                                 /* The queue is no longer contained in the set. */\r
2010                                 pxQueueOrSemaphore->pxQueueSetContainer = NULL;\r
2011                         }\r
2012                         taskEXIT_CRITICAL();\r
2013                         xReturn = pdPASS;\r
2014                 }\r
2015 \r
2016                 return xReturn;\r
2017         } /*lint !e818 xQueueSet could not be declared as pointing to const as it is a typedef. */\r
2018 \r
2019 #endif /* configUSE_QUEUE_SETS */\r
2020 /*-----------------------------------------------------------*/\r
2021 \r
2022 #if ( configUSE_QUEUE_SETS == 1 )\r
2023 \r
2024         xQueueSetMemberHandle xQueueSelectFromSet( xQueueSetHandle xQueueSet, portTickType xBlockTimeTicks )\r
2025         {\r
2026         xQueueSetMemberHandle xReturn = NULL;\r
2027 \r
2028                 ( void ) xQueueGenericReceive( ( xQueueHandle ) xQueueSet, &xReturn, xBlockTimeTicks, pdFALSE ); /*lint !e961 Casting from one typedef to another is not redundant. */\r
2029                 return xReturn;\r
2030         }\r
2031 \r
2032 #endif /* configUSE_QUEUE_SETS */\r
2033 /*-----------------------------------------------------------*/\r
2034 \r
2035 #if ( configUSE_QUEUE_SETS == 1 )\r
2036 \r
2037         xQueueSetMemberHandle xQueueSelectFromSetFromISR( xQueueSetHandle xQueueSet )\r
2038         {\r
2039         xQueueSetMemberHandle xReturn = NULL;\r
2040 \r
2041                 ( void ) xQueueReceiveFromISR( ( xQueueHandle ) xQueueSet, &xReturn, NULL ); /*lint !e961 Casting from one typedef to another is not redundant. */\r
2042                 return xReturn;\r
2043         }\r
2044 \r
2045 #endif /* configUSE_QUEUE_SETS */\r
2046 /*-----------------------------------------------------------*/\r
2047 \r
2048 #if ( configUSE_QUEUE_SETS == 1 )\r
2049 \r
2050         static portBASE_TYPE prvNotifyQueueSetContainer( const xQUEUE * const pxQueue, portBASE_TYPE xCopyPosition )\r
2051         {\r
2052         xQUEUE *pxQueueSetContainer = pxQueue->pxQueueSetContainer;\r
2053         portBASE_TYPE xReturn = pdFALSE;\r
2054 \r
2055                 configASSERT( pxQueueSetContainer );\r
2056                 configASSERT( pxQueueSetContainer->uxMessagesWaiting < pxQueueSetContainer->uxLength );\r
2057 \r
2058                 if( pxQueueSetContainer->uxMessagesWaiting < pxQueueSetContainer->uxLength )\r
2059                 {\r
2060                         traceQUEUE_SEND( pxQueueSetContainer );\r
2061                         /* The data copies is the handle of the queue that contains data. */\r
2062                         prvCopyDataToQueue( pxQueueSetContainer, &pxQueue, xCopyPosition );\r
2063                         if( listLIST_IS_EMPTY( &( pxQueueSetContainer->xTasksWaitingToReceive ) ) == pdFALSE )\r
2064                         {\r
2065                                 if( xTaskRemoveFromEventList( &( pxQueueSetContainer->xTasksWaitingToReceive ) ) != pdFALSE )\r
2066                                 {\r
2067                                         /* The task waiting has a higher priority */\r
2068                                         xReturn = pdTRUE;\r
2069                                 }\r
2070                         }\r
2071                 }\r
2072 \r
2073                 return xReturn;\r
2074         }\r
2075 \r
2076 #endif /* configUSE_QUEUE_SETS */\r
2077 \r