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