2 * FreeRTOS Kernel <DEVELOPMENT BRANCH>
3 * Copyright (C) 2021 Amazon.com, Inc. or its affiliates. All Rights Reserved.
5 * SPDX-License-Identifier: MIT
7 * Permission is hereby granted, free of charge, to any person obtaining a copy of
8 * this software and associated documentation files (the "Software"), to deal in
9 * the Software without restriction, including without limitation the rights to
10 * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
11 * the Software, and to permit persons to whom the Software is furnished to do so,
12 * subject to the following conditions:
14 * The above copyright notice and this permission notice shall be included in all
15 * copies or substantial portions of the Software.
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
19 * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
20 * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
21 * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
22 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
24 * https://www.FreeRTOS.org
25 * https://github.com/FreeRTOS
29 /* Standard includes. */
33 /* Defining MPU_WRAPPERS_INCLUDED_FROM_API_FILE prevents task.h from redefining
34 * all the API functions to use the MPU wrappers. That should only be done when
35 * task.h is included from an application file. */
36 #define MPU_WRAPPERS_INCLUDED_FROM_API_FILE
38 /* FreeRTOS includes. */
42 #include "stack_macros.h"
44 /* Lint e9021, e961 and e750 are suppressed as a MISRA exception justified
45 * because the MPU ports require MPU_WRAPPERS_INCLUDED_FROM_API_FILE to be defined
46 * for the header files above, but not in this file, in order to generate the
47 * correct privileged Vs unprivileged linkage and placement. */
48 #undef MPU_WRAPPERS_INCLUDED_FROM_API_FILE /*lint !e961 !e750 !e9021. */
50 /* Set configUSE_STATS_FORMATTING_FUNCTIONS to 2 to include the stats formatting
51 * functions but without including stdio.h here. */
52 #if ( configUSE_STATS_FORMATTING_FUNCTIONS == 1 )
54 /* At the bottom of this file are two optional functions that can be used
55 * to generate human readable text from the raw data generated by the
56 * uxTaskGetSystemState() function. Note the formatting functions are provided
57 * for convenience only, and are NOT considered part of the kernel. */
59 #endif /* configUSE_STATS_FORMATTING_FUNCTIONS == 1 ) */
61 #if ( configUSE_PREEMPTION == 0 )
63 /* If the cooperative scheduler is being used then a yield should not be
64 * performed just because a higher priority task has been woken. */
65 #define taskYIELD_IF_USING_PREEMPTION()
67 #define taskYIELD_IF_USING_PREEMPTION() portYIELD_WITHIN_API()
70 /* Values that can be assigned to the ucNotifyState member of the TCB. */
71 #define taskNOT_WAITING_NOTIFICATION ( ( uint8_t ) 0 ) /* Must be zero as it is the initialised value. */
72 #define taskWAITING_NOTIFICATION ( ( uint8_t ) 1 )
73 #define taskNOTIFICATION_RECEIVED ( ( uint8_t ) 2 )
76 * The value used to fill the stack of a task when the task is created. This
77 * is used purely for checking the high water mark for tasks.
79 #define tskSTACK_FILL_BYTE ( 0xa5U )
81 /* Bits used to record how a task's stack and TCB were allocated. */
82 #define tskDYNAMICALLY_ALLOCATED_STACK_AND_TCB ( ( uint8_t ) 0 )
83 #define tskSTATICALLY_ALLOCATED_STACK_ONLY ( ( uint8_t ) 1 )
84 #define tskSTATICALLY_ALLOCATED_STACK_AND_TCB ( ( uint8_t ) 2 )
86 /* If any of the following are set then task stacks are filled with a known
87 * value so the high water mark can be determined. If none of the following are
88 * set then don't fill the stack so there is no unnecessary dependency on memset. */
89 #if ( ( configCHECK_FOR_STACK_OVERFLOW > 1 ) || ( configUSE_TRACE_FACILITY == 1 ) || ( INCLUDE_uxTaskGetStackHighWaterMark == 1 ) || ( INCLUDE_uxTaskGetStackHighWaterMark2 == 1 ) )
90 #define tskSET_NEW_STACKS_TO_KNOWN_VALUE 1
92 #define tskSET_NEW_STACKS_TO_KNOWN_VALUE 0
96 * Macros used by vListTask to indicate which state a task is in.
98 #define tskRUNNING_CHAR ( 'X' )
99 #define tskBLOCKED_CHAR ( 'B' )
100 #define tskREADY_CHAR ( 'R' )
101 #define tskDELETED_CHAR ( 'D' )
102 #define tskSUSPENDED_CHAR ( 'S' )
105 * Some kernel aware debuggers require the data the debugger needs access to to
106 * be global, rather than file scope.
108 #ifdef portREMOVE_STATIC_QUALIFIER
112 /* The name allocated to the Idle task. This can be overridden by defining
113 * configIDLE_TASK_NAME in FreeRTOSConfig.h. */
114 #ifndef configIDLE_TASK_NAME
115 #define configIDLE_TASK_NAME "IDLE"
118 #if ( configUSE_PORT_OPTIMISED_TASK_SELECTION == 0 )
120 /* If configUSE_PORT_OPTIMISED_TASK_SELECTION is 0 then task selection is
121 * performed in a generic way that is not optimised to any particular
122 * microcontroller architecture. */
124 /* uxTopReadyPriority holds the priority of the highest priority ready
126 #define taskRECORD_READY_PRIORITY( uxPriority ) \
128 if( ( uxPriority ) > uxTopReadyPriority ) \
130 uxTopReadyPriority = ( uxPriority ); \
132 } while( 0 ) /* taskRECORD_READY_PRIORITY */
134 /*-----------------------------------------------------------*/
136 #define taskSELECT_HIGHEST_PRIORITY_TASK() \
138 UBaseType_t uxTopPriority = uxTopReadyPriority; \
140 /* Find the highest priority queue that contains ready tasks. */ \
141 while( listLIST_IS_EMPTY( &( pxReadyTasksLists[ uxTopPriority ] ) ) ) \
143 configASSERT( uxTopPriority ); \
147 /* listGET_OWNER_OF_NEXT_ENTRY indexes through the list, so the tasks of \
148 * the same priority get an equal share of the processor time. */ \
149 listGET_OWNER_OF_NEXT_ENTRY( pxCurrentTCB, &( pxReadyTasksLists[ uxTopPriority ] ) ); \
150 uxTopReadyPriority = uxTopPriority; \
151 } while( 0 ) /* taskSELECT_HIGHEST_PRIORITY_TASK */
153 /*-----------------------------------------------------------*/
155 /* Define away taskRESET_READY_PRIORITY() and portRESET_READY_PRIORITY() as
156 * they are only required when a port optimised method of task selection is
158 #define taskRESET_READY_PRIORITY( uxPriority )
159 #define portRESET_READY_PRIORITY( uxPriority, uxTopReadyPriority )
161 #else /* configUSE_PORT_OPTIMISED_TASK_SELECTION */
163 /* If configUSE_PORT_OPTIMISED_TASK_SELECTION is 1 then task selection is
164 * performed in a way that is tailored to the particular microcontroller
165 * architecture being used. */
167 /* A port optimised version is provided. Call the port defined macros. */
168 #define taskRECORD_READY_PRIORITY( uxPriority ) portRECORD_READY_PRIORITY( ( uxPriority ), uxTopReadyPriority )
170 /*-----------------------------------------------------------*/
172 #define taskSELECT_HIGHEST_PRIORITY_TASK() \
174 UBaseType_t uxTopPriority; \
176 /* Find the highest priority list that contains ready tasks. */ \
177 portGET_HIGHEST_PRIORITY( uxTopPriority, uxTopReadyPriority ); \
178 configASSERT( listCURRENT_LIST_LENGTH( &( pxReadyTasksLists[ uxTopPriority ] ) ) > 0 ); \
179 listGET_OWNER_OF_NEXT_ENTRY( pxCurrentTCB, &( pxReadyTasksLists[ uxTopPriority ] ) ); \
182 /*-----------------------------------------------------------*/
184 /* A port optimised version is provided, call it only if the TCB being reset
185 * is being referenced from a ready list. If it is referenced from a delayed
186 * or suspended list then it won't be in a ready list. */
187 #define taskRESET_READY_PRIORITY( uxPriority ) \
189 if( listCURRENT_LIST_LENGTH( &( pxReadyTasksLists[ ( uxPriority ) ] ) ) == ( UBaseType_t ) 0 ) \
191 portRESET_READY_PRIORITY( ( uxPriority ), ( uxTopReadyPriority ) ); \
195 #endif /* configUSE_PORT_OPTIMISED_TASK_SELECTION */
197 /*-----------------------------------------------------------*/
199 /* pxDelayedTaskList and pxOverflowDelayedTaskList are switched when the tick
200 * count overflows. */
201 #define taskSWITCH_DELAYED_LISTS() \
205 /* The delayed tasks list should be empty when the lists are switched. */ \
206 configASSERT( ( listLIST_IS_EMPTY( pxDelayedTaskList ) ) ); \
208 pxTemp = pxDelayedTaskList; \
209 pxDelayedTaskList = pxOverflowDelayedTaskList; \
210 pxOverflowDelayedTaskList = pxTemp; \
212 prvResetNextTaskUnblockTime(); \
215 /*-----------------------------------------------------------*/
218 * Place the task represented by pxTCB into the appropriate ready list for
219 * the task. It is inserted at the end of the list.
221 #define prvAddTaskToReadyList( pxTCB ) \
223 traceMOVED_TASK_TO_READY_STATE( pxTCB ); \
224 taskRECORD_READY_PRIORITY( ( pxTCB )->uxPriority ); \
225 listINSERT_END( &( pxReadyTasksLists[ ( pxTCB )->uxPriority ] ), &( ( pxTCB )->xStateListItem ) ); \
226 tracePOST_MOVED_TASK_TO_READY_STATE( pxTCB ); \
228 /*-----------------------------------------------------------*/
231 * Several functions take a TaskHandle_t parameter that can optionally be NULL,
232 * where NULL is used to indicate that the handle of the currently executing
233 * task should be used in place of the parameter. This macro simply checks to
234 * see if the parameter is NULL and returns a pointer to the appropriate TCB.
236 #define prvGetTCBFromHandle( pxHandle ) ( ( ( pxHandle ) == NULL ) ? pxCurrentTCB : ( pxHandle ) )
238 /* The item value of the event list item is normally used to hold the priority
239 * of the task to which it belongs (coded to allow it to be held in reverse
240 * priority order). However, it is occasionally borrowed for other purposes. It
241 * is important its value is not updated due to a task priority change while it is
242 * being used for another purpose. The following bit definition is used to inform
243 * the scheduler that the value should not be changed - in which case it is the
244 * responsibility of whichever module is using the value to ensure it gets set back
245 * to its original value when it is released. */
246 #if ( configTICK_TYPE_WIDTH_IN_BITS == TICK_TYPE_WIDTH_16_BITS )
247 #define taskEVENT_LIST_ITEM_VALUE_IN_USE 0x8000U
248 #elif ( configTICK_TYPE_WIDTH_IN_BITS == TICK_TYPE_WIDTH_32_BITS )
249 #define taskEVENT_LIST_ITEM_VALUE_IN_USE 0x80000000UL
250 #elif ( configTICK_TYPE_WIDTH_IN_BITS == TICK_TYPE_WIDTH_64_BITS )
251 #define taskEVENT_LIST_ITEM_VALUE_IN_USE 0x8000000000000000ULL
255 * Task control block. A task control block (TCB) is allocated for each task,
256 * and stores task state information, including a pointer to the task's context
257 * (the task's run time environment, including register values)
259 typedef struct tskTaskControlBlock /* The old naming convention is used to prevent breaking kernel aware debuggers. */
261 volatile StackType_t * pxTopOfStack; /**< Points to the location of the last item placed on the tasks stack. THIS MUST BE THE FIRST MEMBER OF THE TCB STRUCT. */
263 #if ( portUSING_MPU_WRAPPERS == 1 )
264 xMPU_SETTINGS xMPUSettings; /**< The MPU settings are defined as part of the port layer. THIS MUST BE THE SECOND MEMBER OF THE TCB STRUCT. */
267 ListItem_t xStateListItem; /**< The list that the state list item of a task is reference from denotes the state of that task (Ready, Blocked, Suspended ). */
268 ListItem_t xEventListItem; /**< Used to reference a task from an event list. */
269 UBaseType_t uxPriority; /**< The priority of the task. 0 is the lowest priority. */
270 StackType_t * pxStack; /**< Points to the start of the stack. */
271 char pcTaskName[ configMAX_TASK_NAME_LEN ]; /**< Descriptive name given to the task when created. Facilitates debugging only. */ /*lint !e971 Unqualified char types are allowed for strings and single characters only. */
273 #if ( ( portSTACK_GROWTH > 0 ) || ( configRECORD_STACK_HIGH_ADDRESS == 1 ) )
274 StackType_t * pxEndOfStack; /**< Points to the highest valid address for the stack. */
277 #if ( portCRITICAL_NESTING_IN_TCB == 1 )
278 UBaseType_t uxCriticalNesting; /**< Holds the critical section nesting depth for ports that do not maintain their own count in the port layer. */
281 #if ( configUSE_TRACE_FACILITY == 1 )
282 UBaseType_t uxTCBNumber; /**< Stores a number that increments each time a TCB is created. It allows debuggers to determine when a task has been deleted and then recreated. */
283 UBaseType_t uxTaskNumber; /**< Stores a number specifically for use by third party trace code. */
286 #if ( configUSE_MUTEXES == 1 )
287 UBaseType_t uxBasePriority; /**< The priority last assigned to the task - used by the priority inheritance mechanism. */
288 UBaseType_t uxMutexesHeld;
291 #if ( configUSE_APPLICATION_TASK_TAG == 1 )
292 TaskHookFunction_t pxTaskTag;
295 #if ( configNUM_THREAD_LOCAL_STORAGE_POINTERS > 0 )
296 void * pvThreadLocalStoragePointers[ configNUM_THREAD_LOCAL_STORAGE_POINTERS ];
299 #if ( configGENERATE_RUN_TIME_STATS == 1 )
300 configRUN_TIME_COUNTER_TYPE ulRunTimeCounter; /**< Stores the amount of time the task has spent in the Running state. */
303 #if ( configUSE_C_RUNTIME_TLS_SUPPORT == 1 )
304 configTLS_BLOCK_TYPE xTLSBlock; /**< Memory block used as Thread Local Storage (TLS) Block for the task. */
307 #if ( configUSE_TASK_NOTIFICATIONS == 1 )
308 volatile uint32_t ulNotifiedValue[ configTASK_NOTIFICATION_ARRAY_ENTRIES ];
309 volatile uint8_t ucNotifyState[ configTASK_NOTIFICATION_ARRAY_ENTRIES ];
312 /* See the comments in FreeRTOS.h with the definition of
313 * tskSTATIC_AND_DYNAMIC_ALLOCATION_POSSIBLE. */
314 #if ( tskSTATIC_AND_DYNAMIC_ALLOCATION_POSSIBLE != 0 ) /*lint !e731 !e9029 Macro has been consolidated for readability reasons. */
315 uint8_t ucStaticallyAllocated; /**< Set to pdTRUE if the task is a statically allocated to ensure no attempt is made to free the memory. */
318 #if ( INCLUDE_xTaskAbortDelay == 1 )
319 uint8_t ucDelayAborted;
322 #if ( configUSE_POSIX_ERRNO == 1 )
327 /* The old tskTCB name is maintained above then typedefed to the new TCB_t name
328 * below to enable the use of older kernel aware debuggers. */
329 typedef tskTCB TCB_t;
331 /*lint -save -e956 A manual analysis and inspection has been used to determine
332 * which static variables must be declared volatile. */
333 portDONT_DISCARD PRIVILEGED_DATA TCB_t * volatile pxCurrentTCB = NULL;
335 /* Lists for ready and blocked tasks. --------------------
336 * xDelayedTaskList1 and xDelayedTaskList2 could be moved to function scope but
337 * doing so breaks some kernel aware debuggers and debuggers that rely on removing
338 * the static qualifier. */
339 PRIVILEGED_DATA static List_t pxReadyTasksLists[ configMAX_PRIORITIES ]; /**< Prioritised ready tasks. */
340 PRIVILEGED_DATA static List_t xDelayedTaskList1; /**< Delayed tasks. */
341 PRIVILEGED_DATA static List_t xDelayedTaskList2; /**< Delayed tasks (two lists are used - one for delays that have overflowed the current tick count. */
342 PRIVILEGED_DATA static List_t * volatile pxDelayedTaskList; /**< Points to the delayed task list currently being used. */
343 PRIVILEGED_DATA static List_t * volatile pxOverflowDelayedTaskList; /**< Points to the delayed task list currently being used to hold tasks that have overflowed the current tick count. */
344 PRIVILEGED_DATA static List_t xPendingReadyList; /**< Tasks that have been readied while the scheduler was suspended. They will be moved to the ready list when the scheduler is resumed. */
346 #if ( INCLUDE_vTaskDelete == 1 )
348 PRIVILEGED_DATA static List_t xTasksWaitingTermination; /**< Tasks that have been deleted - but their memory not yet freed. */
349 PRIVILEGED_DATA static volatile UBaseType_t uxDeletedTasksWaitingCleanUp = ( UBaseType_t ) 0U;
353 #if ( INCLUDE_vTaskSuspend == 1 )
355 PRIVILEGED_DATA static List_t xSuspendedTaskList; /**< Tasks that are currently suspended. */
359 /* Global POSIX errno. Its value is changed upon context switching to match
360 * the errno of the currently running task. */
361 #if ( configUSE_POSIX_ERRNO == 1 )
362 int FreeRTOS_errno = 0;
365 /* Other file private variables. --------------------------------*/
366 PRIVILEGED_DATA static volatile UBaseType_t uxCurrentNumberOfTasks = ( UBaseType_t ) 0U;
367 PRIVILEGED_DATA static volatile TickType_t xTickCount = ( TickType_t ) configINITIAL_TICK_COUNT;
368 PRIVILEGED_DATA static volatile UBaseType_t uxTopReadyPriority = tskIDLE_PRIORITY;
369 PRIVILEGED_DATA static volatile BaseType_t xSchedulerRunning = pdFALSE;
370 PRIVILEGED_DATA static volatile TickType_t xPendedTicks = ( TickType_t ) 0U;
371 PRIVILEGED_DATA static volatile BaseType_t xYieldPending = pdFALSE;
372 PRIVILEGED_DATA static volatile BaseType_t xNumOfOverflows = ( BaseType_t ) 0;
373 PRIVILEGED_DATA static UBaseType_t uxTaskNumber = ( UBaseType_t ) 0U;
374 PRIVILEGED_DATA static volatile TickType_t xNextTaskUnblockTime = ( TickType_t ) 0U; /* Initialised to portMAX_DELAY before the scheduler starts. */
375 PRIVILEGED_DATA static TaskHandle_t xIdleTaskHandle = NULL; /**< Holds the handle of the idle task. The idle task is created automatically when the scheduler is started. */
377 /* Improve support for OpenOCD. The kernel tracks Ready tasks via priority lists.
378 * For tracking the state of remote threads, OpenOCD uses uxTopUsedPriority
379 * to determine the number of priority lists to read back from the remote target. */
380 const volatile UBaseType_t uxTopUsedPriority = configMAX_PRIORITIES - 1U;
382 /* Context switches are held pending while the scheduler is suspended. Also,
383 * interrupts must not manipulate the xStateListItem of a TCB, or any of the
384 * lists the xStateListItem can be referenced from, if the scheduler is suspended.
385 * If an interrupt needs to unblock a task while the scheduler is suspended then it
386 * moves the task's event list item into the xPendingReadyList, ready for the
387 * kernel to move the task from the pending ready list into the real ready list
388 * when the scheduler is unsuspended. The pending ready list itself can only be
389 * accessed from a critical section. */
390 PRIVILEGED_DATA static volatile UBaseType_t uxSchedulerSuspended = ( UBaseType_t ) 0U;
392 #if ( configGENERATE_RUN_TIME_STATS == 1 )
394 /* Do not move these variables to function scope as doing so prevents the
395 * code working with debuggers that need to remove the static qualifier. */
396 PRIVILEGED_DATA static configRUN_TIME_COUNTER_TYPE ulTaskSwitchedInTime = 0UL; /**< Holds the value of a timer/counter the last time a task was switched in. */
397 PRIVILEGED_DATA static volatile configRUN_TIME_COUNTER_TYPE ulTotalRunTime = 0UL; /**< Holds the total amount of execution time as defined by the run time counter clock. */
403 /*-----------------------------------------------------------*/
405 /* File private functions. --------------------------------*/
408 * Utility task that simply returns pdTRUE if the task referenced by xTask is
409 * currently in the Suspended state, or pdFALSE if the task referenced by xTask
410 * is in any other state.
412 #if ( INCLUDE_vTaskSuspend == 1 )
414 static BaseType_t prvTaskIsTaskSuspended( const TaskHandle_t xTask ) PRIVILEGED_FUNCTION;
416 #endif /* INCLUDE_vTaskSuspend */
419 * Utility to ready all the lists used by the scheduler. This is called
420 * automatically upon the creation of the first task.
422 static void prvInitialiseTaskLists( void ) PRIVILEGED_FUNCTION;
425 * The idle task, which as all tasks is implemented as a never ending loop.
426 * The idle task is automatically created and added to the ready lists upon
427 * creation of the first user task.
429 * The portTASK_FUNCTION_PROTO() macro is used to allow port/compiler specific
430 * language extensions. The equivalent prototype for this function is:
432 * void prvIdleTask( void *pvParameters );
435 static portTASK_FUNCTION_PROTO( prvIdleTask, pvParameters ) PRIVILEGED_FUNCTION;
438 * Utility to free all memory allocated by the scheduler to hold a TCB,
439 * including the stack pointed to by the TCB.
441 * This does not free memory allocated by the task itself (i.e. memory
442 * allocated by calls to pvPortMalloc from within the tasks application code).
444 #if ( INCLUDE_vTaskDelete == 1 )
446 static void prvDeleteTCB( TCB_t * pxTCB ) PRIVILEGED_FUNCTION;
451 * Used only by the idle task. This checks to see if anything has been placed
452 * in the list of tasks waiting to be deleted. If so the task is cleaned up
453 * and its TCB deleted.
455 static void prvCheckTasksWaitingTermination( void ) PRIVILEGED_FUNCTION;
458 * The currently executing task is entering the Blocked state. Add the task to
459 * either the current or the overflow delayed task list.
461 static void prvAddCurrentTaskToDelayedList( TickType_t xTicksToWait,
462 const BaseType_t xCanBlockIndefinitely ) PRIVILEGED_FUNCTION;
465 * Fills an TaskStatus_t structure with information on each task that is
466 * referenced from the pxList list (which may be a ready list, a delayed list,
467 * a suspended list, etc.).
469 * THIS FUNCTION IS INTENDED FOR DEBUGGING ONLY, AND SHOULD NOT BE CALLED FROM
470 * NORMAL APPLICATION CODE.
472 #if ( configUSE_TRACE_FACILITY == 1 )
474 static UBaseType_t prvListTasksWithinSingleList( TaskStatus_t * pxTaskStatusArray,
476 eTaskState eState ) PRIVILEGED_FUNCTION;
481 * Searches pxList for a task with name pcNameToQuery - returning a handle to
482 * the task if it is found, or NULL if the task is not found.
484 #if ( INCLUDE_xTaskGetHandle == 1 )
486 static TCB_t * prvSearchForNameWithinSingleList( List_t * pxList,
487 const char pcNameToQuery[] ) PRIVILEGED_FUNCTION;
492 * When a task is created, the stack of the task is filled with a known value.
493 * This function determines the 'high water mark' of the task stack by
494 * determining how much of the stack remains at the original preset value.
496 #if ( ( configUSE_TRACE_FACILITY == 1 ) || ( INCLUDE_uxTaskGetStackHighWaterMark == 1 ) || ( INCLUDE_uxTaskGetStackHighWaterMark2 == 1 ) )
498 static configSTACK_DEPTH_TYPE prvTaskCheckFreeStackSpace( const uint8_t * pucStackByte ) PRIVILEGED_FUNCTION;
503 * Return the amount of time, in ticks, that will pass before the kernel will
504 * next move a task from the Blocked state to the Running state.
506 * This conditional compilation should use inequality to 0, not equality to 1.
507 * This is to ensure portSUPPRESS_TICKS_AND_SLEEP() can be called when user
508 * defined low power mode implementations require configUSE_TICKLESS_IDLE to be
509 * set to a value other than 1.
511 #if ( configUSE_TICKLESS_IDLE != 0 )
513 static TickType_t prvGetExpectedIdleTime( void ) PRIVILEGED_FUNCTION;
518 * Set xNextTaskUnblockTime to the time at which the next Blocked state task
519 * will exit the Blocked state.
521 static void prvResetNextTaskUnblockTime( void ) PRIVILEGED_FUNCTION;
523 #if ( configUSE_STATS_FORMATTING_FUNCTIONS > 0 )
526 * Helper function used to pad task names with spaces when printing out
527 * human readable tables of task information.
529 static char * prvWriteNameToBuffer( char * pcBuffer,
530 const char * pcTaskName ) PRIVILEGED_FUNCTION;
535 * Called after a Task_t structure has been allocated either statically or
536 * dynamically to fill in the structure's members.
538 static void prvInitialiseNewTask( TaskFunction_t pxTaskCode,
539 const char * const pcName, /*lint !e971 Unqualified char types are allowed for strings and single characters only. */
540 const uint32_t ulStackDepth,
541 void * const pvParameters,
542 UBaseType_t uxPriority,
543 TaskHandle_t * const pxCreatedTask,
545 const MemoryRegion_t * const xRegions ) PRIVILEGED_FUNCTION;
548 * Called after a new task has been created and initialised to place the task
549 * under the control of the scheduler.
551 static void prvAddNewTaskToReadyList( TCB_t * pxNewTCB ) PRIVILEGED_FUNCTION;
554 * freertos_tasks_c_additions_init() should only be called if the user definable
555 * macro FREERTOS_TASKS_C_ADDITIONS_INIT() is defined, as that is the only macro
556 * called by the function.
558 #ifdef FREERTOS_TASKS_C_ADDITIONS_INIT
560 static void freertos_tasks_c_additions_init( void ) PRIVILEGED_FUNCTION;
564 /*-----------------------------------------------------------*/
566 #if ( configSUPPORT_STATIC_ALLOCATION == 1 )
568 TaskHandle_t xTaskCreateStatic( TaskFunction_t pxTaskCode,
569 const char * const pcName, /*lint !e971 Unqualified char types are allowed for strings and single characters only. */
570 const uint32_t ulStackDepth,
571 void * const pvParameters,
572 UBaseType_t uxPriority,
573 StackType_t * const puxStackBuffer,
574 StaticTask_t * const pxTaskBuffer )
577 TaskHandle_t xReturn;
579 configASSERT( puxStackBuffer != NULL );
580 configASSERT( pxTaskBuffer != NULL );
582 #if ( configASSERT_DEFINED == 1 )
584 /* Sanity check that the size of the structure used to declare a
585 * variable of type StaticTask_t equals the size of the real task
587 volatile size_t xSize = sizeof( StaticTask_t );
588 configASSERT( xSize == sizeof( TCB_t ) );
589 ( void ) xSize; /* Prevent lint warning when configASSERT() is not used. */
591 #endif /* configASSERT_DEFINED */
593 if( ( pxTaskBuffer != NULL ) && ( puxStackBuffer != NULL ) )
595 /* The memory used for the task's TCB and stack are passed into this
596 * function - use them. */
597 pxNewTCB = ( TCB_t * ) pxTaskBuffer; /*lint !e740 !e9087 Unusual cast is ok as the structures are designed to have the same alignment, and the size is checked by an assert. */
598 memset( ( void * ) pxNewTCB, 0x00, sizeof( TCB_t ) );
599 pxNewTCB->pxStack = ( StackType_t * ) puxStackBuffer;
601 #if ( tskSTATIC_AND_DYNAMIC_ALLOCATION_POSSIBLE != 0 ) /*lint !e731 !e9029 Macro has been consolidated for readability reasons. */
603 /* Tasks can be created statically or dynamically, so note this
604 * task was created statically in case the task is later deleted. */
605 pxNewTCB->ucStaticallyAllocated = tskSTATICALLY_ALLOCATED_STACK_AND_TCB;
607 #endif /* tskSTATIC_AND_DYNAMIC_ALLOCATION_POSSIBLE */
609 prvInitialiseNewTask( pxTaskCode, pcName, ulStackDepth, pvParameters, uxPriority, &xReturn, pxNewTCB, NULL );
610 prvAddNewTaskToReadyList( pxNewTCB );
620 #endif /* SUPPORT_STATIC_ALLOCATION */
621 /*-----------------------------------------------------------*/
623 #if ( ( portUSING_MPU_WRAPPERS == 1 ) && ( configSUPPORT_STATIC_ALLOCATION == 1 ) )
625 BaseType_t xTaskCreateRestrictedStatic( const TaskParameters_t * const pxTaskDefinition,
626 TaskHandle_t * pxCreatedTask )
629 BaseType_t xReturn = errCOULD_NOT_ALLOCATE_REQUIRED_MEMORY;
631 configASSERT( pxTaskDefinition->puxStackBuffer != NULL );
632 configASSERT( pxTaskDefinition->pxTaskBuffer != NULL );
634 if( ( pxTaskDefinition->puxStackBuffer != NULL ) && ( pxTaskDefinition->pxTaskBuffer != NULL ) )
636 /* Allocate space for the TCB. Where the memory comes from depends
637 * on the implementation of the port malloc function and whether or
638 * not static allocation is being used. */
639 pxNewTCB = ( TCB_t * ) pxTaskDefinition->pxTaskBuffer;
640 memset( ( void * ) pxNewTCB, 0x00, sizeof( TCB_t ) );
642 /* Store the stack location in the TCB. */
643 pxNewTCB->pxStack = pxTaskDefinition->puxStackBuffer;
645 #if ( tskSTATIC_AND_DYNAMIC_ALLOCATION_POSSIBLE != 0 )
647 /* Tasks can be created statically or dynamically, so note this
648 * task was created statically in case the task is later deleted. */
649 pxNewTCB->ucStaticallyAllocated = tskSTATICALLY_ALLOCATED_STACK_AND_TCB;
651 #endif /* tskSTATIC_AND_DYNAMIC_ALLOCATION_POSSIBLE */
653 prvInitialiseNewTask( pxTaskDefinition->pvTaskCode,
654 pxTaskDefinition->pcName,
655 ( uint32_t ) pxTaskDefinition->usStackDepth,
656 pxTaskDefinition->pvParameters,
657 pxTaskDefinition->uxPriority,
658 pxCreatedTask, pxNewTCB,
659 pxTaskDefinition->xRegions );
661 prvAddNewTaskToReadyList( pxNewTCB );
668 #endif /* ( portUSING_MPU_WRAPPERS == 1 ) && ( configSUPPORT_STATIC_ALLOCATION == 1 ) */
669 /*-----------------------------------------------------------*/
671 #if ( ( portUSING_MPU_WRAPPERS == 1 ) && ( configSUPPORT_DYNAMIC_ALLOCATION == 1 ) )
673 BaseType_t xTaskCreateRestricted( const TaskParameters_t * const pxTaskDefinition,
674 TaskHandle_t * pxCreatedTask )
677 BaseType_t xReturn = errCOULD_NOT_ALLOCATE_REQUIRED_MEMORY;
679 configASSERT( pxTaskDefinition->puxStackBuffer );
681 if( pxTaskDefinition->puxStackBuffer != NULL )
683 /* Allocate space for the TCB. Where the memory comes from depends
684 * on the implementation of the port malloc function and whether or
685 * not static allocation is being used. */
686 pxNewTCB = ( TCB_t * ) pvPortMalloc( sizeof( TCB_t ) );
688 if( pxNewTCB != NULL )
690 memset( ( void * ) pxNewTCB, 0x00, sizeof( TCB_t ) );
692 /* Store the stack location in the TCB. */
693 pxNewTCB->pxStack = pxTaskDefinition->puxStackBuffer;
695 #if ( tskSTATIC_AND_DYNAMIC_ALLOCATION_POSSIBLE != 0 )
697 /* Tasks can be created statically or dynamically, so note
698 * this task had a statically allocated stack in case it is
699 * later deleted. The TCB was allocated dynamically. */
700 pxNewTCB->ucStaticallyAllocated = tskSTATICALLY_ALLOCATED_STACK_ONLY;
702 #endif /* tskSTATIC_AND_DYNAMIC_ALLOCATION_POSSIBLE */
704 prvInitialiseNewTask( pxTaskDefinition->pvTaskCode,
705 pxTaskDefinition->pcName,
706 ( uint32_t ) pxTaskDefinition->usStackDepth,
707 pxTaskDefinition->pvParameters,
708 pxTaskDefinition->uxPriority,
709 pxCreatedTask, pxNewTCB,
710 pxTaskDefinition->xRegions );
712 prvAddNewTaskToReadyList( pxNewTCB );
720 #endif /* portUSING_MPU_WRAPPERS */
721 /*-----------------------------------------------------------*/
723 #if ( configSUPPORT_DYNAMIC_ALLOCATION == 1 )
725 BaseType_t xTaskCreate( TaskFunction_t pxTaskCode,
726 const char * const pcName, /*lint !e971 Unqualified char types are allowed for strings and single characters only. */
727 const configSTACK_DEPTH_TYPE usStackDepth,
728 void * const pvParameters,
729 UBaseType_t uxPriority,
730 TaskHandle_t * const pxCreatedTask )
735 /* If the stack grows down then allocate the stack then the TCB so the stack
736 * does not grow into the TCB. Likewise if the stack grows up then allocate
737 * the TCB then the stack. */
738 #if ( portSTACK_GROWTH > 0 )
740 /* Allocate space for the TCB. Where the memory comes from depends on
741 * the implementation of the port malloc function and whether or not static
742 * allocation is being used. */
743 pxNewTCB = ( TCB_t * ) pvPortMalloc( sizeof( TCB_t ) );
745 if( pxNewTCB != NULL )
747 memset( ( void * ) pxNewTCB, 0x00, sizeof( TCB_t ) );
749 /* Allocate space for the stack used by the task being created.
750 * The base of the stack memory stored in the TCB so the task can
751 * be deleted later if required. */
752 pxNewTCB->pxStack = ( StackType_t * ) pvPortMallocStack( ( ( ( size_t ) usStackDepth ) * sizeof( StackType_t ) ) ); /*lint !e961 MISRA exception as the casts are only redundant for some ports. */
754 if( pxNewTCB->pxStack == NULL )
756 /* Could not allocate the stack. Delete the allocated TCB. */
757 vPortFree( pxNewTCB );
762 #else /* portSTACK_GROWTH */
764 StackType_t * pxStack;
766 /* Allocate space for the stack used by the task being created. */
767 pxStack = pvPortMallocStack( ( ( ( size_t ) usStackDepth ) * sizeof( StackType_t ) ) ); /*lint !e9079 All values returned by pvPortMalloc() have at least the alignment required by the MCU's stack and this allocation is the stack. */
769 if( pxStack != NULL )
771 /* Allocate space for the TCB. */
772 pxNewTCB = ( TCB_t * ) pvPortMalloc( sizeof( TCB_t ) ); /*lint !e9087 !e9079 All values returned by pvPortMalloc() have at least the alignment required by the MCU's stack, and the first member of TCB_t is always a pointer to the task's stack. */
774 if( pxNewTCB != NULL )
776 memset( ( void * ) pxNewTCB, 0x00, sizeof( TCB_t ) );
778 /* Store the stack location in the TCB. */
779 pxNewTCB->pxStack = pxStack;
783 /* The stack cannot be used as the TCB was not created. Free
785 vPortFreeStack( pxStack );
793 #endif /* portSTACK_GROWTH */
795 if( pxNewTCB != NULL )
797 #if ( tskSTATIC_AND_DYNAMIC_ALLOCATION_POSSIBLE != 0 ) /*lint !e9029 !e731 Macro has been consolidated for readability reasons. */
799 /* Tasks can be created statically or dynamically, so note this
800 * task was created dynamically in case it is later deleted. */
801 pxNewTCB->ucStaticallyAllocated = tskDYNAMICALLY_ALLOCATED_STACK_AND_TCB;
803 #endif /* tskSTATIC_AND_DYNAMIC_ALLOCATION_POSSIBLE */
805 prvInitialiseNewTask( pxTaskCode, pcName, ( uint32_t ) usStackDepth, pvParameters, uxPriority, pxCreatedTask, pxNewTCB, NULL );
806 prvAddNewTaskToReadyList( pxNewTCB );
811 xReturn = errCOULD_NOT_ALLOCATE_REQUIRED_MEMORY;
817 #endif /* configSUPPORT_DYNAMIC_ALLOCATION */
818 /*-----------------------------------------------------------*/
820 static void prvInitialiseNewTask( TaskFunction_t pxTaskCode,
821 const char * const pcName, /*lint !e971 Unqualified char types are allowed for strings and single characters only. */
822 const uint32_t ulStackDepth,
823 void * const pvParameters,
824 UBaseType_t uxPriority,
825 TaskHandle_t * const pxCreatedTask,
827 const MemoryRegion_t * const xRegions )
829 StackType_t * pxTopOfStack;
832 #if ( portUSING_MPU_WRAPPERS == 1 )
833 /* Should the task be created in privileged mode? */
834 BaseType_t xRunPrivileged;
836 if( ( uxPriority & portPRIVILEGE_BIT ) != 0U )
838 xRunPrivileged = pdTRUE;
842 xRunPrivileged = pdFALSE;
844 uxPriority &= ~portPRIVILEGE_BIT;
845 #endif /* portUSING_MPU_WRAPPERS == 1 */
847 /* Avoid dependency on memset() if it is not required. */
848 #if ( tskSET_NEW_STACKS_TO_KNOWN_VALUE == 1 )
850 /* Fill the stack with a known value to assist debugging. */
851 ( void ) memset( pxNewTCB->pxStack, ( int ) tskSTACK_FILL_BYTE, ( size_t ) ulStackDepth * sizeof( StackType_t ) );
853 #endif /* tskSET_NEW_STACKS_TO_KNOWN_VALUE */
855 /* Calculate the top of stack address. This depends on whether the stack
856 * grows from high memory to low (as per the 80x86) or vice versa.
857 * portSTACK_GROWTH is used to make the result positive or negative as required
859 #if ( portSTACK_GROWTH < 0 )
861 pxTopOfStack = &( pxNewTCB->pxStack[ ulStackDepth - ( uint32_t ) 1 ] );
862 pxTopOfStack = ( StackType_t * ) ( ( ( portPOINTER_SIZE_TYPE ) pxTopOfStack ) & ( ~( ( portPOINTER_SIZE_TYPE ) portBYTE_ALIGNMENT_MASK ) ) ); /*lint !e923 !e9033 !e9078 MISRA exception. Avoiding casts between pointers and integers is not practical. Size differences accounted for using portPOINTER_SIZE_TYPE type. Checked by assert(). */
864 /* Check the alignment of the calculated top of stack is correct. */
865 configASSERT( ( ( ( portPOINTER_SIZE_TYPE ) pxTopOfStack & ( portPOINTER_SIZE_TYPE ) portBYTE_ALIGNMENT_MASK ) == 0UL ) );
867 #if ( configRECORD_STACK_HIGH_ADDRESS == 1 )
869 /* Also record the stack's high address, which may assist
871 pxNewTCB->pxEndOfStack = pxTopOfStack;
873 #endif /* configRECORD_STACK_HIGH_ADDRESS */
875 #else /* portSTACK_GROWTH */
877 pxTopOfStack = pxNewTCB->pxStack;
879 /* Check the alignment of the stack buffer is correct. */
880 configASSERT( ( ( ( portPOINTER_SIZE_TYPE ) pxNewTCB->pxStack & ( portPOINTER_SIZE_TYPE ) portBYTE_ALIGNMENT_MASK ) == 0UL ) );
882 /* The other extreme of the stack space is required if stack checking is
884 pxNewTCB->pxEndOfStack = pxNewTCB->pxStack + ( ulStackDepth - ( uint32_t ) 1 );
886 #endif /* portSTACK_GROWTH */
888 /* Store the task name in the TCB. */
891 for( x = ( UBaseType_t ) 0; x < ( UBaseType_t ) configMAX_TASK_NAME_LEN; x++ )
893 pxNewTCB->pcTaskName[ x ] = pcName[ x ];
895 /* Don't copy all configMAX_TASK_NAME_LEN if the string is shorter than
896 * configMAX_TASK_NAME_LEN characters just in case the memory after the
897 * string is not accessible (extremely unlikely). */
898 if( pcName[ x ] == ( char ) 0x00 )
904 mtCOVERAGE_TEST_MARKER();
908 /* Ensure the name string is terminated in the case that the string length
909 * was greater or equal to configMAX_TASK_NAME_LEN. */
910 pxNewTCB->pcTaskName[ configMAX_TASK_NAME_LEN - 1 ] = '\0';
914 mtCOVERAGE_TEST_MARKER();
917 /* This is used as an array index so must ensure it's not too large. */
918 configASSERT( uxPriority < configMAX_PRIORITIES );
920 if( uxPriority >= ( UBaseType_t ) configMAX_PRIORITIES )
922 uxPriority = ( UBaseType_t ) configMAX_PRIORITIES - ( UBaseType_t ) 1U;
926 mtCOVERAGE_TEST_MARKER();
929 pxNewTCB->uxPriority = uxPriority;
930 #if ( configUSE_MUTEXES == 1 )
932 pxNewTCB->uxBasePriority = uxPriority;
934 #endif /* configUSE_MUTEXES */
936 vListInitialiseItem( &( pxNewTCB->xStateListItem ) );
937 vListInitialiseItem( &( pxNewTCB->xEventListItem ) );
939 /* Set the pxNewTCB as a link back from the ListItem_t. This is so we can get
940 * back to the containing TCB from a generic item in a list. */
941 listSET_LIST_ITEM_OWNER( &( pxNewTCB->xStateListItem ), pxNewTCB );
943 /* Event lists are always in priority order. */
944 listSET_LIST_ITEM_VALUE( &( pxNewTCB->xEventListItem ), ( TickType_t ) configMAX_PRIORITIES - ( TickType_t ) uxPriority ); /*lint !e961 MISRA exception as the casts are only redundant for some ports. */
945 listSET_LIST_ITEM_OWNER( &( pxNewTCB->xEventListItem ), pxNewTCB );
947 #if ( portUSING_MPU_WRAPPERS == 1 )
949 vPortStoreTaskMPUSettings( &( pxNewTCB->xMPUSettings ), xRegions, pxNewTCB->pxStack, ulStackDepth );
953 /* Avoid compiler warning about unreferenced parameter. */
958 #if ( configUSE_C_RUNTIME_TLS_SUPPORT == 1 )
960 /* Allocate and initialize memory for the task's TLS Block. */
961 configINIT_TLS_BLOCK( pxNewTCB->xTLSBlock, pxTopOfStack );
965 /* Initialize the TCB stack to look as if the task was already running,
966 * but had been interrupted by the scheduler. The return address is set
967 * to the start of the task function. Once the stack has been initialised
968 * the top of stack variable is updated. */
969 #if ( portUSING_MPU_WRAPPERS == 1 )
971 /* If the port has capability to detect stack overflow,
972 * pass the stack end address to the stack initialization
973 * function as well. */
974 #if ( portHAS_STACK_OVERFLOW_CHECKING == 1 )
976 #if ( portSTACK_GROWTH < 0 )
978 pxNewTCB->pxTopOfStack = pxPortInitialiseStack( pxTopOfStack, pxNewTCB->pxStack, pxTaskCode, pvParameters, xRunPrivileged );
980 #else /* portSTACK_GROWTH */
982 pxNewTCB->pxTopOfStack = pxPortInitialiseStack( pxTopOfStack, pxNewTCB->pxEndOfStack, pxTaskCode, pvParameters, xRunPrivileged );
984 #endif /* portSTACK_GROWTH */
986 #else /* portHAS_STACK_OVERFLOW_CHECKING */
988 pxNewTCB->pxTopOfStack = pxPortInitialiseStack( pxTopOfStack, pxTaskCode, pvParameters, xRunPrivileged );
990 #endif /* portHAS_STACK_OVERFLOW_CHECKING */
992 #else /* portUSING_MPU_WRAPPERS */
994 /* If the port has capability to detect stack overflow,
995 * pass the stack end address to the stack initialization
996 * function as well. */
997 #if ( portHAS_STACK_OVERFLOW_CHECKING == 1 )
999 #if ( portSTACK_GROWTH < 0 )
1001 pxNewTCB->pxTopOfStack = pxPortInitialiseStack( pxTopOfStack, pxNewTCB->pxStack, pxTaskCode, pvParameters );
1003 #else /* portSTACK_GROWTH */
1005 pxNewTCB->pxTopOfStack = pxPortInitialiseStack( pxTopOfStack, pxNewTCB->pxEndOfStack, pxTaskCode, pvParameters );
1007 #endif /* portSTACK_GROWTH */
1009 #else /* portHAS_STACK_OVERFLOW_CHECKING */
1011 pxNewTCB->pxTopOfStack = pxPortInitialiseStack( pxTopOfStack, pxTaskCode, pvParameters );
1013 #endif /* portHAS_STACK_OVERFLOW_CHECKING */
1015 #endif /* portUSING_MPU_WRAPPERS */
1017 if( pxCreatedTask != NULL )
1019 /* Pass the handle out in an anonymous way. The handle can be used to
1020 * change the created task's priority, delete the created task, etc.*/
1021 *pxCreatedTask = ( TaskHandle_t ) pxNewTCB;
1025 mtCOVERAGE_TEST_MARKER();
1028 /*-----------------------------------------------------------*/
1030 static void prvAddNewTaskToReadyList( TCB_t * pxNewTCB )
1032 /* Ensure interrupts don't access the task lists while the lists are being
1034 taskENTER_CRITICAL();
1036 uxCurrentNumberOfTasks++;
1038 if( pxCurrentTCB == NULL )
1040 /* There are no other tasks, or all the other tasks are in
1041 * the suspended state - make this the current task. */
1042 pxCurrentTCB = pxNewTCB;
1044 if( uxCurrentNumberOfTasks == ( UBaseType_t ) 1 )
1046 /* This is the first task to be created so do the preliminary
1047 * initialisation required. We will not recover if this call
1048 * fails, but we will report the failure. */
1049 prvInitialiseTaskLists();
1053 mtCOVERAGE_TEST_MARKER();
1058 /* If the scheduler is not already running, make this task the
1059 * current task if it is the highest priority task to be created
1061 if( xSchedulerRunning == pdFALSE )
1063 if( pxCurrentTCB->uxPriority <= pxNewTCB->uxPriority )
1065 pxCurrentTCB = pxNewTCB;
1069 mtCOVERAGE_TEST_MARKER();
1074 mtCOVERAGE_TEST_MARKER();
1080 #if ( configUSE_TRACE_FACILITY == 1 )
1082 /* Add a counter into the TCB for tracing only. */
1083 pxNewTCB->uxTCBNumber = uxTaskNumber;
1085 #endif /* configUSE_TRACE_FACILITY */
1086 traceTASK_CREATE( pxNewTCB );
1088 prvAddTaskToReadyList( pxNewTCB );
1090 portSETUP_TCB( pxNewTCB );
1092 taskEXIT_CRITICAL();
1094 if( xSchedulerRunning != pdFALSE )
1096 /* If the created task is of a higher priority than the current task
1097 * then it should run now. */
1098 if( pxCurrentTCB->uxPriority < pxNewTCB->uxPriority )
1100 taskYIELD_IF_USING_PREEMPTION();
1104 mtCOVERAGE_TEST_MARKER();
1109 mtCOVERAGE_TEST_MARKER();
1112 /*-----------------------------------------------------------*/
1114 #if ( INCLUDE_vTaskDelete == 1 )
1116 void vTaskDelete( TaskHandle_t xTaskToDelete )
1120 taskENTER_CRITICAL();
1122 /* If null is passed in here then it is the calling task that is
1124 pxTCB = prvGetTCBFromHandle( xTaskToDelete );
1126 /* Remove task from the ready/delayed list. */
1127 if( uxListRemove( &( pxTCB->xStateListItem ) ) == ( UBaseType_t ) 0 )
1129 taskRESET_READY_PRIORITY( pxTCB->uxPriority );
1133 mtCOVERAGE_TEST_MARKER();
1136 /* Is the task waiting on an event also? */
1137 if( listLIST_ITEM_CONTAINER( &( pxTCB->xEventListItem ) ) != NULL )
1139 ( void ) uxListRemove( &( pxTCB->xEventListItem ) );
1143 mtCOVERAGE_TEST_MARKER();
1146 /* Increment the uxTaskNumber also so kernel aware debuggers can
1147 * detect that the task lists need re-generating. This is done before
1148 * portPRE_TASK_DELETE_HOOK() as in the Windows port that macro will
1152 if( pxTCB == pxCurrentTCB )
1154 /* A task is deleting itself. This cannot complete within the
1155 * task itself, as a context switch to another task is required.
1156 * Place the task in the termination list. The idle task will
1157 * check the termination list and free up any memory allocated by
1158 * the scheduler for the TCB and stack of the deleted task. */
1159 vListInsertEnd( &xTasksWaitingTermination, &( pxTCB->xStateListItem ) );
1161 /* Increment the ucTasksDeleted variable so the idle task knows
1162 * there is a task that has been deleted and that it should therefore
1163 * check the xTasksWaitingTermination list. */
1164 ++uxDeletedTasksWaitingCleanUp;
1166 /* Call the delete hook before portPRE_TASK_DELETE_HOOK() as
1167 * portPRE_TASK_DELETE_HOOK() does not return in the Win32 port. */
1168 traceTASK_DELETE( pxTCB );
1170 /* The pre-delete hook is primarily for the Windows simulator,
1171 * in which Windows specific clean up operations are performed,
1172 * after which it is not possible to yield away from this task -
1173 * hence xYieldPending is used to latch that a context switch is
1175 portPRE_TASK_DELETE_HOOK( pxTCB, &xYieldPending );
1179 --uxCurrentNumberOfTasks;
1180 traceTASK_DELETE( pxTCB );
1182 /* Reset the next expected unblock time in case it referred to
1183 * the task that has just been deleted. */
1184 prvResetNextTaskUnblockTime();
1187 taskEXIT_CRITICAL();
1189 /* If the task is not deleting itself, call prvDeleteTCB from outside of
1190 * critical section. If a task deletes itself, prvDeleteTCB is called
1191 * from prvCheckTasksWaitingTermination which is called from Idle task. */
1192 if( pxTCB != pxCurrentTCB )
1194 prvDeleteTCB( pxTCB );
1197 /* Force a reschedule if it is the currently running task that has just
1199 if( xSchedulerRunning != pdFALSE )
1201 if( pxTCB == pxCurrentTCB )
1203 configASSERT( uxSchedulerSuspended == ( UBaseType_t ) 0U );
1204 portYIELD_WITHIN_API();
1208 mtCOVERAGE_TEST_MARKER();
1213 #endif /* INCLUDE_vTaskDelete */
1214 /*-----------------------------------------------------------*/
1216 #if ( INCLUDE_xTaskDelayUntil == 1 )
1218 BaseType_t xTaskDelayUntil( TickType_t * const pxPreviousWakeTime,
1219 const TickType_t xTimeIncrement )
1221 TickType_t xTimeToWake;
1222 BaseType_t xAlreadyYielded, xShouldDelay = pdFALSE;
1224 configASSERT( pxPreviousWakeTime );
1225 configASSERT( ( xTimeIncrement > 0U ) );
1226 configASSERT( uxSchedulerSuspended == ( UBaseType_t ) 0U );
1230 /* Minor optimisation. The tick count cannot change in this
1232 const TickType_t xConstTickCount = xTickCount;
1234 /* Generate the tick time at which the task wants to wake. */
1235 xTimeToWake = *pxPreviousWakeTime + xTimeIncrement;
1237 if( xConstTickCount < *pxPreviousWakeTime )
1239 /* The tick count has overflowed since this function was
1240 * lasted called. In this case the only time we should ever
1241 * actually delay is if the wake time has also overflowed,
1242 * and the wake time is greater than the tick time. When this
1243 * is the case it is as if neither time had overflowed. */
1244 if( ( xTimeToWake < *pxPreviousWakeTime ) && ( xTimeToWake > xConstTickCount ) )
1246 xShouldDelay = pdTRUE;
1250 mtCOVERAGE_TEST_MARKER();
1255 /* The tick time has not overflowed. In this case we will
1256 * delay if either the wake time has overflowed, and/or the
1257 * tick time is less than the wake time. */
1258 if( ( xTimeToWake < *pxPreviousWakeTime ) || ( xTimeToWake > xConstTickCount ) )
1260 xShouldDelay = pdTRUE;
1264 mtCOVERAGE_TEST_MARKER();
1268 /* Update the wake time ready for the next call. */
1269 *pxPreviousWakeTime = xTimeToWake;
1271 if( xShouldDelay != pdFALSE )
1273 traceTASK_DELAY_UNTIL( xTimeToWake );
1275 /* prvAddCurrentTaskToDelayedList() needs the block time, not
1276 * the time to wake, so subtract the current tick count. */
1277 prvAddCurrentTaskToDelayedList( xTimeToWake - xConstTickCount, pdFALSE );
1281 mtCOVERAGE_TEST_MARKER();
1284 xAlreadyYielded = xTaskResumeAll();
1286 /* Force a reschedule if xTaskResumeAll has not already done so, we may
1287 * have put ourselves to sleep. */
1288 if( xAlreadyYielded == pdFALSE )
1290 portYIELD_WITHIN_API();
1294 mtCOVERAGE_TEST_MARKER();
1297 return xShouldDelay;
1300 #endif /* INCLUDE_xTaskDelayUntil */
1301 /*-----------------------------------------------------------*/
1303 #if ( INCLUDE_vTaskDelay == 1 )
1305 void vTaskDelay( const TickType_t xTicksToDelay )
1307 BaseType_t xAlreadyYielded = pdFALSE;
1309 /* A delay time of zero just forces a reschedule. */
1310 if( xTicksToDelay > ( TickType_t ) 0U )
1312 configASSERT( uxSchedulerSuspended == ( UBaseType_t ) 0U );
1317 /* A task that is removed from the event list while the
1318 * scheduler is suspended will not get placed in the ready
1319 * list or removed from the blocked list until the scheduler
1322 * This task cannot be in an event list as it is the currently
1323 * executing task. */
1324 prvAddCurrentTaskToDelayedList( xTicksToDelay, pdFALSE );
1326 xAlreadyYielded = xTaskResumeAll();
1330 mtCOVERAGE_TEST_MARKER();
1333 /* Force a reschedule if xTaskResumeAll has not already done so, we may
1334 * have put ourselves to sleep. */
1335 if( xAlreadyYielded == pdFALSE )
1337 portYIELD_WITHIN_API();
1341 mtCOVERAGE_TEST_MARKER();
1345 #endif /* INCLUDE_vTaskDelay */
1346 /*-----------------------------------------------------------*/
1348 #if ( ( INCLUDE_eTaskGetState == 1 ) || ( configUSE_TRACE_FACILITY == 1 ) || ( INCLUDE_xTaskAbortDelay == 1 ) )
1350 eTaskState eTaskGetState( TaskHandle_t xTask )
1353 List_t const * pxStateList;
1354 List_t const * pxEventList;
1355 List_t const * pxDelayedList;
1356 List_t const * pxOverflowedDelayedList;
1357 const TCB_t * const pxTCB = xTask;
1359 configASSERT( pxTCB );
1361 if( pxTCB == pxCurrentTCB )
1363 /* The task calling this function is querying its own state. */
1368 taskENTER_CRITICAL();
1370 pxStateList = listLIST_ITEM_CONTAINER( &( pxTCB->xStateListItem ) );
1371 pxEventList = listLIST_ITEM_CONTAINER( &( pxTCB->xEventListItem ) );
1372 pxDelayedList = pxDelayedTaskList;
1373 pxOverflowedDelayedList = pxOverflowDelayedTaskList;
1375 taskEXIT_CRITICAL();
1377 if( pxEventList == &xPendingReadyList )
1379 /* The task has been placed on the pending ready list, so its
1380 * state is eReady regardless of what list the task's state list
1381 * item is currently placed on. */
1384 else if( ( pxStateList == pxDelayedList ) || ( pxStateList == pxOverflowedDelayedList ) )
1386 /* The task being queried is referenced from one of the Blocked
1391 #if ( INCLUDE_vTaskSuspend == 1 )
1392 else if( pxStateList == &xSuspendedTaskList )
1394 /* The task being queried is referenced from the suspended
1395 * list. Is it genuinely suspended or is it blocked
1397 if( listLIST_ITEM_CONTAINER( &( pxTCB->xEventListItem ) ) == NULL )
1399 #if ( configUSE_TASK_NOTIFICATIONS == 1 )
1403 /* The task does not appear on the event list item of
1404 * and of the RTOS objects, but could still be in the
1405 * blocked state if it is waiting on its notification
1406 * rather than waiting on an object. If not, is
1408 eReturn = eSuspended;
1410 for( x = 0; x < configTASK_NOTIFICATION_ARRAY_ENTRIES; x++ )
1412 if( pxTCB->ucNotifyState[ x ] == taskWAITING_NOTIFICATION )
1419 #else /* if ( configUSE_TASK_NOTIFICATIONS == 1 ) */
1421 eReturn = eSuspended;
1423 #endif /* if ( configUSE_TASK_NOTIFICATIONS == 1 ) */
1430 #endif /* if ( INCLUDE_vTaskSuspend == 1 ) */
1432 #if ( INCLUDE_vTaskDelete == 1 )
1433 else if( ( pxStateList == &xTasksWaitingTermination ) || ( pxStateList == NULL ) )
1435 /* The task being queried is referenced from the deleted
1436 * tasks list, or it is not referenced from any lists at
1442 else /*lint !e525 Negative indentation is intended to make use of pre-processor clearer. */
1444 /* If the task is not in any other state, it must be in the
1445 * Ready (including pending ready) state. */
1451 } /*lint !e818 xTask cannot be a pointer to const because it is a typedef. */
1453 #endif /* INCLUDE_eTaskGetState */
1454 /*-----------------------------------------------------------*/
1456 #if ( INCLUDE_uxTaskPriorityGet == 1 )
1458 UBaseType_t uxTaskPriorityGet( const TaskHandle_t xTask )
1460 TCB_t const * pxTCB;
1461 UBaseType_t uxReturn;
1463 taskENTER_CRITICAL();
1465 /* If null is passed in here then it is the priority of the task
1466 * that called uxTaskPriorityGet() that is being queried. */
1467 pxTCB = prvGetTCBFromHandle( xTask );
1468 uxReturn = pxTCB->uxPriority;
1470 taskEXIT_CRITICAL();
1475 #endif /* INCLUDE_uxTaskPriorityGet */
1476 /*-----------------------------------------------------------*/
1478 #if ( INCLUDE_uxTaskPriorityGet == 1 )
1480 UBaseType_t uxTaskPriorityGetFromISR( const TaskHandle_t xTask )
1482 TCB_t const * pxTCB;
1483 UBaseType_t uxReturn;
1484 UBaseType_t uxSavedInterruptState;
1486 /* RTOS ports that support interrupt nesting have the concept of a
1487 * maximum system call (or maximum API call) interrupt priority.
1488 * Interrupts that are above the maximum system call priority are keep
1489 * permanently enabled, even when the RTOS kernel is in a critical section,
1490 * but cannot make any calls to FreeRTOS API functions. If configASSERT()
1491 * is defined in FreeRTOSConfig.h then
1492 * portASSERT_IF_INTERRUPT_PRIORITY_INVALID() will result in an assertion
1493 * failure if a FreeRTOS API function is called from an interrupt that has
1494 * been assigned a priority above the configured maximum system call
1495 * priority. Only FreeRTOS functions that end in FromISR can be called
1496 * from interrupts that have been assigned a priority at or (logically)
1497 * below the maximum system call interrupt priority. FreeRTOS maintains a
1498 * separate interrupt safe API to ensure interrupt entry is as fast and as
1499 * simple as possible. More information (albeit Cortex-M specific) is
1500 * provided on the following link:
1501 * https://www.FreeRTOS.org/RTOS-Cortex-M3-M4.html */
1502 portASSERT_IF_INTERRUPT_PRIORITY_INVALID();
1504 uxSavedInterruptState = portSET_INTERRUPT_MASK_FROM_ISR();
1506 /* If null is passed in here then it is the priority of the calling
1507 * task that is being queried. */
1508 pxTCB = prvGetTCBFromHandle( xTask );
1509 uxReturn = pxTCB->uxPriority;
1511 portCLEAR_INTERRUPT_MASK_FROM_ISR( uxSavedInterruptState );
1516 #endif /* INCLUDE_uxTaskPriorityGet */
1517 /*-----------------------------------------------------------*/
1519 #if ( INCLUDE_vTaskPrioritySet == 1 )
1521 void vTaskPrioritySet( TaskHandle_t xTask,
1522 UBaseType_t uxNewPriority )
1525 UBaseType_t uxCurrentBasePriority, uxPriorityUsedOnEntry;
1526 BaseType_t xYieldRequired = pdFALSE;
1528 configASSERT( uxNewPriority < configMAX_PRIORITIES );
1530 /* Ensure the new priority is valid. */
1531 if( uxNewPriority >= ( UBaseType_t ) configMAX_PRIORITIES )
1533 uxNewPriority = ( UBaseType_t ) configMAX_PRIORITIES - ( UBaseType_t ) 1U;
1537 mtCOVERAGE_TEST_MARKER();
1540 taskENTER_CRITICAL();
1542 /* If null is passed in here then it is the priority of the calling
1543 * task that is being changed. */
1544 pxTCB = prvGetTCBFromHandle( xTask );
1546 traceTASK_PRIORITY_SET( pxTCB, uxNewPriority );
1548 #if ( configUSE_MUTEXES == 1 )
1550 uxCurrentBasePriority = pxTCB->uxBasePriority;
1554 uxCurrentBasePriority = pxTCB->uxPriority;
1558 if( uxCurrentBasePriority != uxNewPriority )
1560 /* The priority change may have readied a task of higher
1561 * priority than the calling task. */
1562 if( uxNewPriority > uxCurrentBasePriority )
1564 if( pxTCB != pxCurrentTCB )
1566 /* The priority of a task other than the currently
1567 * running task is being raised. Is the priority being
1568 * raised above that of the running task? */
1569 if( uxNewPriority > pxCurrentTCB->uxPriority )
1571 xYieldRequired = pdTRUE;
1575 mtCOVERAGE_TEST_MARKER();
1580 /* The priority of the running task is being raised,
1581 * but the running task must already be the highest
1582 * priority task able to run so no yield is required. */
1585 else if( pxTCB == pxCurrentTCB )
1587 /* Setting the priority of the running task down means
1588 * there may now be another task of higher priority that
1589 * is ready to execute. */
1590 xYieldRequired = pdTRUE;
1594 /* Setting the priority of any other task down does not
1595 * require a yield as the running task must be above the
1596 * new priority of the task being modified. */
1599 /* Remember the ready list the task might be referenced from
1600 * before its uxPriority member is changed so the
1601 * taskRESET_READY_PRIORITY() macro can function correctly. */
1602 uxPriorityUsedOnEntry = pxTCB->uxPriority;
1604 #if ( configUSE_MUTEXES == 1 )
1606 /* Only change the priority being used if the task is not
1607 * currently using an inherited priority. */
1608 if( pxTCB->uxBasePriority == pxTCB->uxPriority )
1610 pxTCB->uxPriority = uxNewPriority;
1614 mtCOVERAGE_TEST_MARKER();
1617 /* The base priority gets set whatever. */
1618 pxTCB->uxBasePriority = uxNewPriority;
1620 #else /* if ( configUSE_MUTEXES == 1 ) */
1622 pxTCB->uxPriority = uxNewPriority;
1624 #endif /* if ( configUSE_MUTEXES == 1 ) */
1626 /* Only reset the event list item value if the value is not
1627 * being used for anything else. */
1628 if( ( listGET_LIST_ITEM_VALUE( &( pxTCB->xEventListItem ) ) & taskEVENT_LIST_ITEM_VALUE_IN_USE ) == 0UL )
1630 listSET_LIST_ITEM_VALUE( &( pxTCB->xEventListItem ), ( ( TickType_t ) configMAX_PRIORITIES - ( TickType_t ) uxNewPriority ) ); /*lint !e961 MISRA exception as the casts are only redundant for some ports. */
1634 mtCOVERAGE_TEST_MARKER();
1637 /* If the task is in the blocked or suspended list we need do
1638 * nothing more than change its priority variable. However, if
1639 * the task is in a ready list it needs to be removed and placed
1640 * in the list appropriate to its new priority. */
1641 if( listIS_CONTAINED_WITHIN( &( pxReadyTasksLists[ uxPriorityUsedOnEntry ] ), &( pxTCB->xStateListItem ) ) != pdFALSE )
1643 /* The task is currently in its ready list - remove before
1644 * adding it to its new ready list. As we are in a critical
1645 * section we can do this even if the scheduler is suspended. */
1646 if( uxListRemove( &( pxTCB->xStateListItem ) ) == ( UBaseType_t ) 0 )
1648 /* It is known that the task is in its ready list so
1649 * there is no need to check again and the port level
1650 * reset macro can be called directly. */
1651 portRESET_READY_PRIORITY( uxPriorityUsedOnEntry, uxTopReadyPriority );
1655 mtCOVERAGE_TEST_MARKER();
1658 prvAddTaskToReadyList( pxTCB );
1662 mtCOVERAGE_TEST_MARKER();
1665 if( xYieldRequired != pdFALSE )
1667 taskYIELD_IF_USING_PREEMPTION();
1671 mtCOVERAGE_TEST_MARKER();
1674 /* Remove compiler warning about unused variables when the port
1675 * optimised task selection is not being used. */
1676 ( void ) uxPriorityUsedOnEntry;
1679 taskEXIT_CRITICAL();
1682 #endif /* INCLUDE_vTaskPrioritySet */
1683 /*-----------------------------------------------------------*/
1685 #if ( INCLUDE_vTaskSuspend == 1 )
1687 void vTaskSuspend( TaskHandle_t xTaskToSuspend )
1691 taskENTER_CRITICAL();
1693 /* If null is passed in here then it is the running task that is
1694 * being suspended. */
1695 pxTCB = prvGetTCBFromHandle( xTaskToSuspend );
1697 traceTASK_SUSPEND( pxTCB );
1699 /* Remove task from the ready/delayed list and place in the
1700 * suspended list. */
1701 if( uxListRemove( &( pxTCB->xStateListItem ) ) == ( UBaseType_t ) 0 )
1703 taskRESET_READY_PRIORITY( pxTCB->uxPriority );
1707 mtCOVERAGE_TEST_MARKER();
1710 /* Is the task waiting on an event also? */
1711 if( listLIST_ITEM_CONTAINER( &( pxTCB->xEventListItem ) ) != NULL )
1713 ( void ) uxListRemove( &( pxTCB->xEventListItem ) );
1717 mtCOVERAGE_TEST_MARKER();
1720 vListInsertEnd( &xSuspendedTaskList, &( pxTCB->xStateListItem ) );
1722 #if ( configUSE_TASK_NOTIFICATIONS == 1 )
1726 for( x = 0; x < configTASK_NOTIFICATION_ARRAY_ENTRIES; x++ )
1728 if( pxTCB->ucNotifyState[ x ] == taskWAITING_NOTIFICATION )
1730 /* The task was blocked to wait for a notification, but is
1731 * now suspended, so no notification was received. */
1732 pxTCB->ucNotifyState[ x ] = taskNOT_WAITING_NOTIFICATION;
1736 #endif /* if ( configUSE_TASK_NOTIFICATIONS == 1 ) */
1738 taskEXIT_CRITICAL();
1740 if( xSchedulerRunning != pdFALSE )
1742 /* Reset the next expected unblock time in case it referred to the
1743 * task that is now in the Suspended state. */
1744 taskENTER_CRITICAL();
1746 prvResetNextTaskUnblockTime();
1748 taskEXIT_CRITICAL();
1752 mtCOVERAGE_TEST_MARKER();
1755 if( pxTCB == pxCurrentTCB )
1757 if( xSchedulerRunning != pdFALSE )
1759 /* The current task has just been suspended. */
1760 configASSERT( uxSchedulerSuspended == ( UBaseType_t ) 0U );
1761 portYIELD_WITHIN_API();
1765 /* The scheduler is not running, but the task that was pointed
1766 * to by pxCurrentTCB has just been suspended and pxCurrentTCB
1767 * must be adjusted to point to a different task. */
1768 if( listCURRENT_LIST_LENGTH( &xSuspendedTaskList ) == uxCurrentNumberOfTasks ) /*lint !e931 Right has no side effect, just volatile. */
1770 /* No other tasks are ready, so set pxCurrentTCB back to
1771 * NULL so when the next task is created pxCurrentTCB will
1772 * be set to point to it no matter what its relative priority
1774 pxCurrentTCB = NULL;
1778 vTaskSwitchContext();
1784 mtCOVERAGE_TEST_MARKER();
1788 #endif /* INCLUDE_vTaskSuspend */
1789 /*-----------------------------------------------------------*/
1791 #if ( INCLUDE_vTaskSuspend == 1 )
1793 static BaseType_t prvTaskIsTaskSuspended( const TaskHandle_t xTask )
1795 BaseType_t xReturn = pdFALSE;
1796 const TCB_t * const pxTCB = xTask;
1798 /* Accesses xPendingReadyList so must be called from a critical
1801 /* It does not make sense to check if the calling task is suspended. */
1802 configASSERT( xTask );
1804 /* Is the task being resumed actually in the suspended list? */
1805 if( listIS_CONTAINED_WITHIN( &xSuspendedTaskList, &( pxTCB->xStateListItem ) ) != pdFALSE )
1807 /* Has the task already been resumed from within an ISR? */
1808 if( listIS_CONTAINED_WITHIN( &xPendingReadyList, &( pxTCB->xEventListItem ) ) == pdFALSE )
1810 /* Is it in the suspended list because it is in the Suspended
1811 * state, or because is is blocked with no timeout? */
1812 if( listIS_CONTAINED_WITHIN( NULL, &( pxTCB->xEventListItem ) ) != pdFALSE ) /*lint !e961. The cast is only redundant when NULL is used. */
1818 mtCOVERAGE_TEST_MARKER();
1823 mtCOVERAGE_TEST_MARKER();
1828 mtCOVERAGE_TEST_MARKER();
1832 } /*lint !e818 xTask cannot be a pointer to const because it is a typedef. */
1834 #endif /* INCLUDE_vTaskSuspend */
1835 /*-----------------------------------------------------------*/
1837 #if ( INCLUDE_vTaskSuspend == 1 )
1839 void vTaskResume( TaskHandle_t xTaskToResume )
1841 TCB_t * const pxTCB = xTaskToResume;
1843 /* It does not make sense to resume the calling task. */
1844 configASSERT( xTaskToResume );
1846 /* The parameter cannot be NULL as it is impossible to resume the
1847 * currently executing task. */
1848 if( ( pxTCB != pxCurrentTCB ) && ( pxTCB != NULL ) )
1850 taskENTER_CRITICAL();
1852 if( prvTaskIsTaskSuspended( pxTCB ) != pdFALSE )
1854 traceTASK_RESUME( pxTCB );
1856 /* The ready list can be accessed even if the scheduler is
1857 * suspended because this is inside a critical section. */
1858 ( void ) uxListRemove( &( pxTCB->xStateListItem ) );
1859 prvAddTaskToReadyList( pxTCB );
1861 /* A higher priority task may have just been resumed. */
1862 if( pxTCB->uxPriority > pxCurrentTCB->uxPriority )
1864 /* This yield may not cause the task just resumed to run,
1865 * but will leave the lists in the correct state for the
1867 taskYIELD_IF_USING_PREEMPTION();
1871 mtCOVERAGE_TEST_MARKER();
1876 mtCOVERAGE_TEST_MARKER();
1879 taskEXIT_CRITICAL();
1883 mtCOVERAGE_TEST_MARKER();
1887 #endif /* INCLUDE_vTaskSuspend */
1889 /*-----------------------------------------------------------*/
1891 #if ( ( INCLUDE_xTaskResumeFromISR == 1 ) && ( INCLUDE_vTaskSuspend == 1 ) )
1893 BaseType_t xTaskResumeFromISR( TaskHandle_t xTaskToResume )
1895 BaseType_t xYieldRequired = pdFALSE;
1896 TCB_t * const pxTCB = xTaskToResume;
1897 UBaseType_t uxSavedInterruptStatus;
1899 configASSERT( xTaskToResume );
1901 /* RTOS ports that support interrupt nesting have the concept of a
1902 * maximum system call (or maximum API call) interrupt priority.
1903 * Interrupts that are above the maximum system call priority are keep
1904 * permanently enabled, even when the RTOS kernel is in a critical section,
1905 * but cannot make any calls to FreeRTOS API functions. If configASSERT()
1906 * is defined in FreeRTOSConfig.h then
1907 * portASSERT_IF_INTERRUPT_PRIORITY_INVALID() will result in an assertion
1908 * failure if a FreeRTOS API function is called from an interrupt that has
1909 * been assigned a priority above the configured maximum system call
1910 * priority. Only FreeRTOS functions that end in FromISR can be called
1911 * from interrupts that have been assigned a priority at or (logically)
1912 * below the maximum system call interrupt priority. FreeRTOS maintains a
1913 * separate interrupt safe API to ensure interrupt entry is as fast and as
1914 * simple as possible. More information (albeit Cortex-M specific) is
1915 * provided on the following link:
1916 * https://www.FreeRTOS.org/RTOS-Cortex-M3-M4.html */
1917 portASSERT_IF_INTERRUPT_PRIORITY_INVALID();
1919 uxSavedInterruptStatus = portSET_INTERRUPT_MASK_FROM_ISR();
1921 if( prvTaskIsTaskSuspended( pxTCB ) != pdFALSE )
1923 traceTASK_RESUME_FROM_ISR( pxTCB );
1925 /* Check the ready lists can be accessed. */
1926 if( uxSchedulerSuspended == ( UBaseType_t ) 0U )
1928 /* Ready lists can be accessed so move the task from the
1929 * suspended list to the ready list directly. */
1930 if( pxTCB->uxPriority > pxCurrentTCB->uxPriority )
1932 xYieldRequired = pdTRUE;
1934 /* Mark that a yield is pending in case the user is not
1935 * using the return value to initiate a context switch
1936 * from the ISR using portYIELD_FROM_ISR. */
1937 xYieldPending = pdTRUE;
1941 mtCOVERAGE_TEST_MARKER();
1944 ( void ) uxListRemove( &( pxTCB->xStateListItem ) );
1945 prvAddTaskToReadyList( pxTCB );
1949 /* The delayed or ready lists cannot be accessed so the task
1950 * is held in the pending ready list until the scheduler is
1952 vListInsertEnd( &( xPendingReadyList ), &( pxTCB->xEventListItem ) );
1957 mtCOVERAGE_TEST_MARKER();
1960 portCLEAR_INTERRUPT_MASK_FROM_ISR( uxSavedInterruptStatus );
1962 return xYieldRequired;
1965 #endif /* ( ( INCLUDE_xTaskResumeFromISR == 1 ) && ( INCLUDE_vTaskSuspend == 1 ) ) */
1966 /*-----------------------------------------------------------*/
1968 void vTaskStartScheduler( void )
1972 /* Add the idle task at the lowest priority. */
1973 #if ( configSUPPORT_STATIC_ALLOCATION == 1 )
1975 StaticTask_t * pxIdleTaskTCBBuffer = NULL;
1976 StackType_t * pxIdleTaskStackBuffer = NULL;
1977 uint32_t ulIdleTaskStackSize;
1979 /* The Idle task is created using user provided RAM - obtain the
1980 * address of the RAM then create the idle task. */
1981 vApplicationGetIdleTaskMemory( &pxIdleTaskTCBBuffer, &pxIdleTaskStackBuffer, &ulIdleTaskStackSize );
1982 xIdleTaskHandle = xTaskCreateStatic( prvIdleTask,
1983 configIDLE_TASK_NAME,
1984 ulIdleTaskStackSize,
1985 ( void * ) NULL, /*lint !e961. The cast is not redundant for all compilers. */
1986 portPRIVILEGE_BIT, /* In effect ( tskIDLE_PRIORITY | portPRIVILEGE_BIT ), but tskIDLE_PRIORITY is zero. */
1987 pxIdleTaskStackBuffer,
1988 pxIdleTaskTCBBuffer ); /*lint !e961 MISRA exception, justified as it is not a redundant explicit cast to all supported compilers. */
1990 if( xIdleTaskHandle != NULL )
1999 #else /* if ( configSUPPORT_STATIC_ALLOCATION == 1 ) */
2001 /* The Idle task is being created using dynamically allocated RAM. */
2002 xReturn = xTaskCreate( prvIdleTask,
2003 configIDLE_TASK_NAME,
2004 configMINIMAL_STACK_SIZE,
2006 portPRIVILEGE_BIT, /* In effect ( tskIDLE_PRIORITY | portPRIVILEGE_BIT ), but tskIDLE_PRIORITY is zero. */
2007 &xIdleTaskHandle ); /*lint !e961 MISRA exception, justified as it is not a redundant explicit cast to all supported compilers. */
2009 #endif /* configSUPPORT_STATIC_ALLOCATION */
2011 #if ( configUSE_TIMERS == 1 )
2013 if( xReturn == pdPASS )
2015 xReturn = xTimerCreateTimerTask();
2019 mtCOVERAGE_TEST_MARKER();
2022 #endif /* configUSE_TIMERS */
2024 if( xReturn == pdPASS )
2026 /* freertos_tasks_c_additions_init() should only be called if the user
2027 * definable macro FREERTOS_TASKS_C_ADDITIONS_INIT() is defined, as that is
2028 * the only macro called by the function. */
2029 #ifdef FREERTOS_TASKS_C_ADDITIONS_INIT
2031 freertos_tasks_c_additions_init();
2035 /* Interrupts are turned off here, to ensure a tick does not occur
2036 * before or during the call to xPortStartScheduler(). The stacks of
2037 * the created tasks contain a status word with interrupts switched on
2038 * so interrupts will automatically get re-enabled when the first task
2040 portDISABLE_INTERRUPTS();
2042 #if ( configUSE_C_RUNTIME_TLS_SUPPORT == 1 )
2044 /* Switch C-Runtime's TLS Block to point to the TLS
2045 * block specific to the task that will run first. */
2046 configSET_TLS_BLOCK( pxCurrentTCB->xTLSBlock );
2050 xNextTaskUnblockTime = portMAX_DELAY;
2051 xSchedulerRunning = pdTRUE;
2052 xTickCount = ( TickType_t ) configINITIAL_TICK_COUNT;
2054 /* If configGENERATE_RUN_TIME_STATS is defined then the following
2055 * macro must be defined to configure the timer/counter used to generate
2056 * the run time counter time base. NOTE: If configGENERATE_RUN_TIME_STATS
2057 * is set to 0 and the following line fails to build then ensure you do not
2058 * have portCONFIGURE_TIMER_FOR_RUN_TIME_STATS() defined in your
2059 * FreeRTOSConfig.h file. */
2060 portCONFIGURE_TIMER_FOR_RUN_TIME_STATS();
2062 traceTASK_SWITCHED_IN();
2064 /* Setting up the timer tick is hardware specific and thus in the
2065 * portable interface. */
2066 xPortStartScheduler();
2068 /* In most cases, xPortStartScheduler() will not return. If it
2069 * returns pdTRUE then there was not enough heap memory available
2070 * to create either the Idle or the Timer task. If it returned
2071 * pdFALSE, then the application called xTaskEndScheduler().
2072 * Most ports don't implement xTaskEndScheduler() as there is
2073 * nothing to return to. */
2077 /* This line will only be reached if the kernel could not be started,
2078 * because there was not enough FreeRTOS heap to create the idle task
2079 * or the timer task. */
2080 configASSERT( xReturn != errCOULD_NOT_ALLOCATE_REQUIRED_MEMORY );
2083 /* Prevent compiler warnings if INCLUDE_xTaskGetIdleTaskHandle is set to 0,
2084 * meaning xIdleTaskHandle is not used anywhere else. */
2085 ( void ) xIdleTaskHandle;
2087 /* OpenOCD makes use of uxTopUsedPriority for thread debugging. Prevent uxTopUsedPriority
2088 * from getting optimized out as it is no longer used by the kernel. */
2089 ( void ) uxTopUsedPriority;
2091 /*-----------------------------------------------------------*/
2093 void vTaskEndScheduler( void )
2095 /* Stop the scheduler interrupts and call the portable scheduler end
2096 * routine so the original ISRs can be restored if necessary. The port
2097 * layer must ensure interrupts enable bit is left in the correct state. */
2098 portDISABLE_INTERRUPTS();
2099 xSchedulerRunning = pdFALSE;
2100 vPortEndScheduler();
2102 /*----------------------------------------------------------*/
2104 void vTaskSuspendAll( void )
2106 /* A critical section is not required as the variable is of type
2107 * BaseType_t. Please read Richard Barry's reply in the following link to a
2108 * post in the FreeRTOS support forum before reporting this as a bug! -
2109 * https://goo.gl/wu4acr */
2111 /* portSOFTWARE_BARRIER() is only implemented for emulated/simulated ports that
2112 * do not otherwise exhibit real time behaviour. */
2113 portSOFTWARE_BARRIER();
2115 /* The scheduler is suspended if uxSchedulerSuspended is non-zero. An increment
2116 * is used to allow calls to vTaskSuspendAll() to nest. */
2117 ++uxSchedulerSuspended;
2119 /* Enforces ordering for ports and optimised compilers that may otherwise place
2120 * the above increment elsewhere. */
2121 portMEMORY_BARRIER();
2123 /*----------------------------------------------------------*/
2125 #if ( configUSE_TICKLESS_IDLE != 0 )
2127 static TickType_t prvGetExpectedIdleTime( void )
2130 UBaseType_t uxHigherPriorityReadyTasks = pdFALSE;
2132 /* uxHigherPriorityReadyTasks takes care of the case where
2133 * configUSE_PREEMPTION is 0, so there may be tasks above the idle priority
2134 * task that are in the Ready state, even though the idle task is
2136 #if ( configUSE_PORT_OPTIMISED_TASK_SELECTION == 0 )
2138 if( uxTopReadyPriority > tskIDLE_PRIORITY )
2140 uxHigherPriorityReadyTasks = pdTRUE;
2145 const UBaseType_t uxLeastSignificantBit = ( UBaseType_t ) 0x01;
2147 /* When port optimised task selection is used the uxTopReadyPriority
2148 * variable is used as a bit map. If bits other than the least
2149 * significant bit are set then there are tasks that have a priority
2150 * above the idle priority that are in the Ready state. This takes
2151 * care of the case where the co-operative scheduler is in use. */
2152 if( uxTopReadyPriority > uxLeastSignificantBit )
2154 uxHigherPriorityReadyTasks = pdTRUE;
2157 #endif /* if ( configUSE_PORT_OPTIMISED_TASK_SELECTION == 0 ) */
2159 if( pxCurrentTCB->uxPriority > tskIDLE_PRIORITY )
2163 else if( listCURRENT_LIST_LENGTH( &( pxReadyTasksLists[ tskIDLE_PRIORITY ] ) ) > 1 )
2165 /* There are other idle priority tasks in the ready state. If
2166 * time slicing is used then the very next tick interrupt must be
2170 else if( uxHigherPriorityReadyTasks != pdFALSE )
2172 /* There are tasks in the Ready state that have a priority above the
2173 * idle priority. This path can only be reached if
2174 * configUSE_PREEMPTION is 0. */
2179 xReturn = xNextTaskUnblockTime - xTickCount;
2185 #endif /* configUSE_TICKLESS_IDLE */
2186 /*----------------------------------------------------------*/
2188 BaseType_t xTaskResumeAll( void )
2190 TCB_t * pxTCB = NULL;
2191 BaseType_t xAlreadyYielded = pdFALSE;
2193 /* If uxSchedulerSuspended is zero then this function does not match a
2194 * previous call to vTaskSuspendAll(). */
2195 configASSERT( uxSchedulerSuspended != ( UBaseType_t ) 0U );
2197 /* It is possible that an ISR caused a task to be removed from an event
2198 * list while the scheduler was suspended. If this was the case then the
2199 * removed task will have been added to the xPendingReadyList. Once the
2200 * scheduler has been resumed it is safe to move all the pending ready
2201 * tasks from this list into their appropriate ready list. */
2202 taskENTER_CRITICAL();
2204 --uxSchedulerSuspended;
2206 if( uxSchedulerSuspended == ( UBaseType_t ) 0U )
2208 if( uxCurrentNumberOfTasks > ( UBaseType_t ) 0U )
2210 /* Move any readied tasks from the pending list into the
2211 * appropriate ready list. */
2212 while( listLIST_IS_EMPTY( &xPendingReadyList ) == pdFALSE )
2214 pxTCB = listGET_OWNER_OF_HEAD_ENTRY( ( &xPendingReadyList ) ); /*lint !e9079 void * is used as this macro is used with timers and co-routines too. Alignment is known to be fine as the type of the pointer stored and retrieved is the same. */
2215 listREMOVE_ITEM( &( pxTCB->xEventListItem ) );
2216 portMEMORY_BARRIER();
2217 listREMOVE_ITEM( &( pxTCB->xStateListItem ) );
2218 prvAddTaskToReadyList( pxTCB );
2220 /* If the moved task has a priority higher than the current
2221 * task then a yield must be performed. */
2222 if( pxTCB->uxPriority > pxCurrentTCB->uxPriority )
2224 xYieldPending = pdTRUE;
2228 mtCOVERAGE_TEST_MARKER();
2234 /* A task was unblocked while the scheduler was suspended,
2235 * which may have prevented the next unblock time from being
2236 * re-calculated, in which case re-calculate it now. Mainly
2237 * important for low power tickless implementations, where
2238 * this can prevent an unnecessary exit from low power
2240 prvResetNextTaskUnblockTime();
2243 /* If any ticks occurred while the scheduler was suspended then
2244 * they should be processed now. This ensures the tick count does
2245 * not slip, and that any delayed tasks are resumed at the correct
2248 TickType_t xPendedCounts = xPendedTicks; /* Non-volatile copy. */
2250 if( xPendedCounts > ( TickType_t ) 0U )
2254 if( xTaskIncrementTick() != pdFALSE )
2256 xYieldPending = pdTRUE;
2260 mtCOVERAGE_TEST_MARKER();
2264 } while( xPendedCounts > ( TickType_t ) 0U );
2270 mtCOVERAGE_TEST_MARKER();
2274 if( xYieldPending != pdFALSE )
2276 #if ( configUSE_PREEMPTION != 0 )
2278 xAlreadyYielded = pdTRUE;
2281 taskYIELD_IF_USING_PREEMPTION();
2285 mtCOVERAGE_TEST_MARKER();
2291 mtCOVERAGE_TEST_MARKER();
2294 taskEXIT_CRITICAL();
2296 return xAlreadyYielded;
2298 /*-----------------------------------------------------------*/
2300 TickType_t xTaskGetTickCount( void )
2304 /* Critical section required if running on a 16 bit processor. */
2305 portTICK_TYPE_ENTER_CRITICAL();
2307 xTicks = xTickCount;
2309 portTICK_TYPE_EXIT_CRITICAL();
2313 /*-----------------------------------------------------------*/
2315 TickType_t xTaskGetTickCountFromISR( void )
2318 UBaseType_t uxSavedInterruptStatus;
2320 /* RTOS ports that support interrupt nesting have the concept of a maximum
2321 * system call (or maximum API call) interrupt priority. Interrupts that are
2322 * above the maximum system call priority are kept permanently enabled, even
2323 * when the RTOS kernel is in a critical section, but cannot make any calls to
2324 * FreeRTOS API functions. If configASSERT() is defined in FreeRTOSConfig.h
2325 * then portASSERT_IF_INTERRUPT_PRIORITY_INVALID() will result in an assertion
2326 * failure if a FreeRTOS API function is called from an interrupt that has been
2327 * assigned a priority above the configured maximum system call priority.
2328 * Only FreeRTOS functions that end in FromISR can be called from interrupts
2329 * that have been assigned a priority at or (logically) below the maximum
2330 * system call interrupt priority. FreeRTOS maintains a separate interrupt
2331 * safe API to ensure interrupt entry is as fast and as simple as possible.
2332 * More information (albeit Cortex-M specific) is provided on the following
2333 * link: https://www.FreeRTOS.org/RTOS-Cortex-M3-M4.html */
2334 portASSERT_IF_INTERRUPT_PRIORITY_INVALID();
2336 uxSavedInterruptStatus = portTICK_TYPE_SET_INTERRUPT_MASK_FROM_ISR();
2338 xReturn = xTickCount;
2340 portTICK_TYPE_CLEAR_INTERRUPT_MASK_FROM_ISR( uxSavedInterruptStatus );
2344 /*-----------------------------------------------------------*/
2346 UBaseType_t uxTaskGetNumberOfTasks( void )
2348 /* A critical section is not required because the variables are of type
2350 return uxCurrentNumberOfTasks;
2352 /*-----------------------------------------------------------*/
2354 char * pcTaskGetName( TaskHandle_t xTaskToQuery ) /*lint !e971 Unqualified char types are allowed for strings and single characters only. */
2358 /* If null is passed in here then the name of the calling task is being
2360 pxTCB = prvGetTCBFromHandle( xTaskToQuery );
2361 configASSERT( pxTCB );
2362 return &( pxTCB->pcTaskName[ 0 ] );
2364 /*-----------------------------------------------------------*/
2366 #if ( INCLUDE_xTaskGetHandle == 1 )
2368 static TCB_t * prvSearchForNameWithinSingleList( List_t * pxList,
2369 const char pcNameToQuery[] )
2373 TCB_t * pxReturn = NULL;
2376 BaseType_t xBreakLoop;
2378 /* This function is called with the scheduler suspended. */
2380 if( listCURRENT_LIST_LENGTH( pxList ) > ( UBaseType_t ) 0 )
2382 listGET_OWNER_OF_NEXT_ENTRY( pxFirstTCB, pxList ); /*lint !e9079 void * is used as this macro is used with timers and co-routines too. Alignment is known to be fine as the type of the pointer stored and retrieved is the same. */
2386 listGET_OWNER_OF_NEXT_ENTRY( pxNextTCB, pxList ); /*lint !e9079 void * is used as this macro is used with timers and co-routines too. Alignment is known to be fine as the type of the pointer stored and retrieved is the same. */
2388 /* Check each character in the name looking for a match or
2390 xBreakLoop = pdFALSE;
2392 for( x = ( UBaseType_t ) 0; x < ( UBaseType_t ) configMAX_TASK_NAME_LEN; x++ )
2394 cNextChar = pxNextTCB->pcTaskName[ x ];
2396 if( cNextChar != pcNameToQuery[ x ] )
2398 /* Characters didn't match. */
2399 xBreakLoop = pdTRUE;
2401 else if( cNextChar == ( char ) 0x00 )
2403 /* Both strings terminated, a match must have been
2405 pxReturn = pxNextTCB;
2406 xBreakLoop = pdTRUE;
2410 mtCOVERAGE_TEST_MARKER();
2413 if( xBreakLoop != pdFALSE )
2419 if( pxReturn != NULL )
2421 /* The handle has been found. */
2424 } while( pxNextTCB != pxFirstTCB );
2428 mtCOVERAGE_TEST_MARKER();
2434 #endif /* INCLUDE_xTaskGetHandle */
2435 /*-----------------------------------------------------------*/
2437 #if ( INCLUDE_xTaskGetHandle == 1 )
2439 TaskHandle_t xTaskGetHandle( const char * pcNameToQuery ) /*lint !e971 Unqualified char types are allowed for strings and single characters only. */
2441 UBaseType_t uxQueue = configMAX_PRIORITIES;
2444 /* Task names will be truncated to configMAX_TASK_NAME_LEN - 1 bytes. */
2445 configASSERT( strlen( pcNameToQuery ) < configMAX_TASK_NAME_LEN );
2449 /* Search the ready lists. */
2453 pxTCB = prvSearchForNameWithinSingleList( ( List_t * ) &( pxReadyTasksLists[ uxQueue ] ), pcNameToQuery );
2457 /* Found the handle. */
2460 } while( uxQueue > ( UBaseType_t ) tskIDLE_PRIORITY ); /*lint !e961 MISRA exception as the casts are only redundant for some ports. */
2462 /* Search the delayed lists. */
2465 pxTCB = prvSearchForNameWithinSingleList( ( List_t * ) pxDelayedTaskList, pcNameToQuery );
2470 pxTCB = prvSearchForNameWithinSingleList( ( List_t * ) pxOverflowDelayedTaskList, pcNameToQuery );
2473 #if ( INCLUDE_vTaskSuspend == 1 )
2477 /* Search the suspended list. */
2478 pxTCB = prvSearchForNameWithinSingleList( &xSuspendedTaskList, pcNameToQuery );
2483 #if ( INCLUDE_vTaskDelete == 1 )
2487 /* Search the deleted list. */
2488 pxTCB = prvSearchForNameWithinSingleList( &xTasksWaitingTermination, pcNameToQuery );
2493 ( void ) xTaskResumeAll();
2498 #endif /* INCLUDE_xTaskGetHandle */
2499 /*-----------------------------------------------------------*/
2501 #if ( configSUPPORT_STATIC_ALLOCATION == 1 )
2503 BaseType_t xTaskGetStaticBuffers( TaskHandle_t xTask,
2504 StackType_t ** ppuxStackBuffer,
2505 StaticTask_t ** ppxTaskBuffer )
2510 configASSERT( ppuxStackBuffer != NULL );
2511 configASSERT( ppxTaskBuffer != NULL );
2513 pxTCB = prvGetTCBFromHandle( xTask );
2515 #if ( tskSTATIC_AND_DYNAMIC_ALLOCATION_POSSIBLE == 1 )
2517 if( pxTCB->ucStaticallyAllocated == tskSTATICALLY_ALLOCATED_STACK_AND_TCB )
2519 *ppuxStackBuffer = pxTCB->pxStack;
2520 *ppxTaskBuffer = ( StaticTask_t * ) pxTCB;
2523 else if( pxTCB->ucStaticallyAllocated == tskSTATICALLY_ALLOCATED_STACK_ONLY )
2525 *ppuxStackBuffer = pxTCB->pxStack;
2526 *ppxTaskBuffer = NULL;
2534 #else /* tskSTATIC_AND_DYNAMIC_ALLOCATION_POSSIBLE == 1 */
2536 *ppuxStackBuffer = pxTCB->pxStack;
2537 *ppxTaskBuffer = ( StaticTask_t * ) pxTCB;
2540 #endif /* tskSTATIC_AND_DYNAMIC_ALLOCATION_POSSIBLE == 1 */
2545 #endif /* configSUPPORT_STATIC_ALLOCATION */
2546 /*-----------------------------------------------------------*/
2548 #if ( configUSE_TRACE_FACILITY == 1 )
2550 UBaseType_t uxTaskGetSystemState( TaskStatus_t * const pxTaskStatusArray,
2551 const UBaseType_t uxArraySize,
2552 configRUN_TIME_COUNTER_TYPE * const pulTotalRunTime )
2554 UBaseType_t uxTask = 0, uxQueue = configMAX_PRIORITIES;
2558 /* Is there a space in the array for each task in the system? */
2559 if( uxArraySize >= uxCurrentNumberOfTasks )
2561 /* Fill in an TaskStatus_t structure with information on each
2562 * task in the Ready state. */
2566 uxTask += prvListTasksWithinSingleList( &( pxTaskStatusArray[ uxTask ] ), &( pxReadyTasksLists[ uxQueue ] ), eReady );
2567 } while( uxQueue > ( UBaseType_t ) tskIDLE_PRIORITY ); /*lint !e961 MISRA exception as the casts are only redundant for some ports. */
2569 /* Fill in an TaskStatus_t structure with information on each
2570 * task in the Blocked state. */
2571 uxTask += prvListTasksWithinSingleList( &( pxTaskStatusArray[ uxTask ] ), ( List_t * ) pxDelayedTaskList, eBlocked );
2572 uxTask += prvListTasksWithinSingleList( &( pxTaskStatusArray[ uxTask ] ), ( List_t * ) pxOverflowDelayedTaskList, eBlocked );
2574 #if ( INCLUDE_vTaskDelete == 1 )
2576 /* Fill in an TaskStatus_t structure with information on
2577 * each task that has been deleted but not yet cleaned up. */
2578 uxTask += prvListTasksWithinSingleList( &( pxTaskStatusArray[ uxTask ] ), &xTasksWaitingTermination, eDeleted );
2582 #if ( INCLUDE_vTaskSuspend == 1 )
2584 /* Fill in an TaskStatus_t structure with information on
2585 * each task in the Suspended state. */
2586 uxTask += prvListTasksWithinSingleList( &( pxTaskStatusArray[ uxTask ] ), &xSuspendedTaskList, eSuspended );
2590 #if ( configGENERATE_RUN_TIME_STATS == 1 )
2592 if( pulTotalRunTime != NULL )
2594 #ifdef portALT_GET_RUN_TIME_COUNTER_VALUE
2595 portALT_GET_RUN_TIME_COUNTER_VALUE( ( *pulTotalRunTime ) );
2597 *pulTotalRunTime = ( configRUN_TIME_COUNTER_TYPE ) portGET_RUN_TIME_COUNTER_VALUE();
2601 #else /* if ( configGENERATE_RUN_TIME_STATS == 1 ) */
2603 if( pulTotalRunTime != NULL )
2605 *pulTotalRunTime = 0;
2608 #endif /* if ( configGENERATE_RUN_TIME_STATS == 1 ) */
2612 mtCOVERAGE_TEST_MARKER();
2615 ( void ) xTaskResumeAll();
2620 #endif /* configUSE_TRACE_FACILITY */
2621 /*----------------------------------------------------------*/
2623 #if ( INCLUDE_xTaskGetIdleTaskHandle == 1 )
2625 TaskHandle_t xTaskGetIdleTaskHandle( void )
2627 /* If xTaskGetIdleTaskHandle() is called before the scheduler has been
2628 * started, then xIdleTaskHandle will be NULL. */
2629 configASSERT( ( xIdleTaskHandle != NULL ) );
2630 return xIdleTaskHandle;
2633 #endif /* INCLUDE_xTaskGetIdleTaskHandle */
2634 /*----------------------------------------------------------*/
2636 /* This conditional compilation should use inequality to 0, not equality to 1.
2637 * This is to ensure vTaskStepTick() is available when user defined low power mode
2638 * implementations require configUSE_TICKLESS_IDLE to be set to a value other than
2640 #if ( configUSE_TICKLESS_IDLE != 0 )
2642 void vTaskStepTick( TickType_t xTicksToJump )
2644 /* Correct the tick count value after a period during which the tick
2645 * was suppressed. Note this does *not* call the tick hook function for
2646 * each stepped tick. */
2647 configASSERT( ( xTickCount + xTicksToJump ) <= xNextTaskUnblockTime );
2649 if( ( xTickCount + xTicksToJump ) == xNextTaskUnblockTime )
2651 /* Arrange for xTickCount to reach xNextTaskUnblockTime in
2652 * xTaskIncrementTick() when the scheduler resumes. This ensures
2653 * that any delayed tasks are resumed at the correct time. */
2654 configASSERT( uxSchedulerSuspended != ( UBaseType_t ) 0U );
2655 configASSERT( xTicksToJump != ( TickType_t ) 0 );
2657 /* Prevent the tick interrupt modifying xPendedTicks simultaneously. */
2658 taskENTER_CRITICAL();
2662 taskEXIT_CRITICAL();
2667 mtCOVERAGE_TEST_MARKER();
2670 xTickCount += xTicksToJump;
2671 traceINCREASE_TICK_COUNT( xTicksToJump );
2674 #endif /* configUSE_TICKLESS_IDLE */
2675 /*----------------------------------------------------------*/
2677 BaseType_t xTaskCatchUpTicks( TickType_t xTicksToCatchUp )
2679 BaseType_t xYieldOccurred;
2681 /* Must not be called with the scheduler suspended as the implementation
2682 * relies on xPendedTicks being wound down to 0 in xTaskResumeAll(). */
2683 configASSERT( uxSchedulerSuspended == ( UBaseType_t ) 0U );
2685 /* Use xPendedTicks to mimic xTicksToCatchUp number of ticks occurring when
2686 * the scheduler is suspended so the ticks are executed in xTaskResumeAll(). */
2689 /* Prevent the tick interrupt modifying xPendedTicks simultaneously. */
2690 taskENTER_CRITICAL();
2692 xPendedTicks += xTicksToCatchUp;
2694 taskEXIT_CRITICAL();
2695 xYieldOccurred = xTaskResumeAll();
2697 return xYieldOccurred;
2699 /*----------------------------------------------------------*/
2701 #if ( INCLUDE_xTaskAbortDelay == 1 )
2703 BaseType_t xTaskAbortDelay( TaskHandle_t xTask )
2705 TCB_t * pxTCB = xTask;
2708 configASSERT( pxTCB );
2712 /* A task can only be prematurely removed from the Blocked state if
2713 * it is actually in the Blocked state. */
2714 if( eTaskGetState( xTask ) == eBlocked )
2718 /* Remove the reference to the task from the blocked list. An
2719 * interrupt won't touch the xStateListItem because the
2720 * scheduler is suspended. */
2721 ( void ) uxListRemove( &( pxTCB->xStateListItem ) );
2723 /* Is the task waiting on an event also? If so remove it from
2724 * the event list too. Interrupts can touch the event list item,
2725 * even though the scheduler is suspended, so a critical section
2727 taskENTER_CRITICAL();
2729 if( listLIST_ITEM_CONTAINER( &( pxTCB->xEventListItem ) ) != NULL )
2731 ( void ) uxListRemove( &( pxTCB->xEventListItem ) );
2733 /* This lets the task know it was forcibly removed from the
2734 * blocked state so it should not re-evaluate its block time and
2735 * then block again. */
2736 pxTCB->ucDelayAborted = pdTRUE;
2740 mtCOVERAGE_TEST_MARKER();
2743 taskEXIT_CRITICAL();
2745 /* Place the unblocked task into the appropriate ready list. */
2746 prvAddTaskToReadyList( pxTCB );
2748 /* A task being unblocked cannot cause an immediate context
2749 * switch if preemption is turned off. */
2750 #if ( configUSE_PREEMPTION == 1 )
2752 /* Preemption is on, but a context switch should only be
2753 * performed if the unblocked task has a priority that is
2754 * higher than the currently executing task. */
2755 if( pxTCB->uxPriority > pxCurrentTCB->uxPriority )
2757 /* Pend the yield to be performed when the scheduler
2758 * is unsuspended. */
2759 xYieldPending = pdTRUE;
2763 mtCOVERAGE_TEST_MARKER();
2766 #endif /* configUSE_PREEMPTION */
2773 ( void ) xTaskResumeAll();
2778 #endif /* INCLUDE_xTaskAbortDelay */
2779 /*----------------------------------------------------------*/
2781 BaseType_t xTaskIncrementTick( void )
2784 TickType_t xItemValue;
2785 BaseType_t xSwitchRequired = pdFALSE;
2787 /* Called by the portable layer each time a tick interrupt occurs.
2788 * Increments the tick then checks to see if the new tick value will cause any
2789 * tasks to be unblocked. */
2790 traceTASK_INCREMENT_TICK( xTickCount );
2792 if( uxSchedulerSuspended == ( UBaseType_t ) 0U )
2794 /* Minor optimisation. The tick count cannot change in this
2796 const TickType_t xConstTickCount = xTickCount + ( TickType_t ) 1;
2798 /* Increment the RTOS tick, switching the delayed and overflowed
2799 * delayed lists if it wraps to 0. */
2800 xTickCount = xConstTickCount;
2802 if( xConstTickCount == ( TickType_t ) 0U ) /*lint !e774 'if' does not always evaluate to false as it is looking for an overflow. */
2804 taskSWITCH_DELAYED_LISTS();
2808 mtCOVERAGE_TEST_MARKER();
2811 /* See if this tick has made a timeout expire. Tasks are stored in
2812 * the queue in the order of their wake time - meaning once one task
2813 * has been found whose block time has not expired there is no need to
2814 * look any further down the list. */
2815 if( xConstTickCount >= xNextTaskUnblockTime )
2819 if( listLIST_IS_EMPTY( pxDelayedTaskList ) != pdFALSE )
2821 /* The delayed list is empty. Set xNextTaskUnblockTime
2822 * to the maximum possible value so it is extremely
2824 * if( xTickCount >= xNextTaskUnblockTime ) test will pass
2825 * next time through. */
2826 xNextTaskUnblockTime = portMAX_DELAY; /*lint !e961 MISRA exception as the casts are only redundant for some ports. */
2831 /* The delayed list is not empty, get the value of the
2832 * item at the head of the delayed list. This is the time
2833 * at which the task at the head of the delayed list must
2834 * be removed from the Blocked state. */
2835 pxTCB = listGET_OWNER_OF_HEAD_ENTRY( pxDelayedTaskList ); /*lint !e9079 void * is used as this macro is used with timers and co-routines too. Alignment is known to be fine as the type of the pointer stored and retrieved is the same. */
2836 xItemValue = listGET_LIST_ITEM_VALUE( &( pxTCB->xStateListItem ) );
2838 if( xConstTickCount < xItemValue )
2840 /* It is not time to unblock this item yet, but the
2841 * item value is the time at which the task at the head
2842 * of the blocked list must be removed from the Blocked
2843 * state - so record the item value in
2844 * xNextTaskUnblockTime. */
2845 xNextTaskUnblockTime = xItemValue;
2846 break; /*lint !e9011 Code structure here is deemed easier to understand with multiple breaks. */
2850 mtCOVERAGE_TEST_MARKER();
2853 /* It is time to remove the item from the Blocked state. */
2854 listREMOVE_ITEM( &( pxTCB->xStateListItem ) );
2856 /* Is the task waiting on an event also? If so remove
2857 * it from the event list. */
2858 if( listLIST_ITEM_CONTAINER( &( pxTCB->xEventListItem ) ) != NULL )
2860 listREMOVE_ITEM( &( pxTCB->xEventListItem ) );
2864 mtCOVERAGE_TEST_MARKER();
2867 /* Place the unblocked task into the appropriate ready
2869 prvAddTaskToReadyList( pxTCB );
2871 /* A task being unblocked cannot cause an immediate
2872 * context switch if preemption is turned off. */
2873 #if ( configUSE_PREEMPTION == 1 )
2875 /* Preemption is on, but a context switch should
2876 * only be performed if the unblocked task's
2877 * priority is higher than the currently executing
2879 * The case of equal priority tasks sharing
2880 * processing time (which happens when both
2881 * preemption and time slicing are on) is
2883 if( pxTCB->uxPriority > pxCurrentTCB->uxPriority )
2885 xSwitchRequired = pdTRUE;
2889 mtCOVERAGE_TEST_MARKER();
2892 #endif /* configUSE_PREEMPTION */
2897 /* Tasks of equal priority to the currently running task will share
2898 * processing time (time slice) if preemption is on, and the application
2899 * writer has not explicitly turned time slicing off. */
2900 #if ( ( configUSE_PREEMPTION == 1 ) && ( configUSE_TIME_SLICING == 1 ) )
2902 if( listCURRENT_LIST_LENGTH( &( pxReadyTasksLists[ pxCurrentTCB->uxPriority ] ) ) > ( UBaseType_t ) 1 )
2904 xSwitchRequired = pdTRUE;
2908 mtCOVERAGE_TEST_MARKER();
2911 #endif /* ( ( configUSE_PREEMPTION == 1 ) && ( configUSE_TIME_SLICING == 1 ) ) */
2913 #if ( configUSE_TICK_HOOK == 1 )
2915 /* Guard against the tick hook being called when the pended tick
2916 * count is being unwound (when the scheduler is being unlocked). */
2917 if( xPendedTicks == ( TickType_t ) 0 )
2919 vApplicationTickHook();
2923 mtCOVERAGE_TEST_MARKER();
2926 #endif /* configUSE_TICK_HOOK */
2928 #if ( configUSE_PREEMPTION == 1 )
2930 if( xYieldPending != pdFALSE )
2932 xSwitchRequired = pdTRUE;
2936 mtCOVERAGE_TEST_MARKER();
2939 #endif /* configUSE_PREEMPTION */
2945 /* The tick hook gets called at regular intervals, even if the
2946 * scheduler is locked. */
2947 #if ( configUSE_TICK_HOOK == 1 )
2949 vApplicationTickHook();
2954 return xSwitchRequired;
2956 /*-----------------------------------------------------------*/
2958 #if ( configUSE_APPLICATION_TASK_TAG == 1 )
2960 void vTaskSetApplicationTaskTag( TaskHandle_t xTask,
2961 TaskHookFunction_t pxHookFunction )
2965 /* If xTask is NULL then it is the task hook of the calling task that is
2969 xTCB = ( TCB_t * ) pxCurrentTCB;
2976 /* Save the hook function in the TCB. A critical section is required as
2977 * the value can be accessed from an interrupt. */
2978 taskENTER_CRITICAL();
2980 xTCB->pxTaskTag = pxHookFunction;
2982 taskEXIT_CRITICAL();
2985 #endif /* configUSE_APPLICATION_TASK_TAG */
2986 /*-----------------------------------------------------------*/
2988 #if ( configUSE_APPLICATION_TASK_TAG == 1 )
2990 TaskHookFunction_t xTaskGetApplicationTaskTag( TaskHandle_t xTask )
2993 TaskHookFunction_t xReturn;
2995 /* If xTask is NULL then set the calling task's hook. */
2996 pxTCB = prvGetTCBFromHandle( xTask );
2998 /* Save the hook function in the TCB. A critical section is required as
2999 * the value can be accessed from an interrupt. */
3000 taskENTER_CRITICAL();
3002 xReturn = pxTCB->pxTaskTag;
3004 taskEXIT_CRITICAL();
3009 #endif /* configUSE_APPLICATION_TASK_TAG */
3010 /*-----------------------------------------------------------*/
3012 #if ( configUSE_APPLICATION_TASK_TAG == 1 )
3014 TaskHookFunction_t xTaskGetApplicationTaskTagFromISR( TaskHandle_t xTask )
3017 TaskHookFunction_t xReturn;
3018 UBaseType_t uxSavedInterruptStatus;
3020 /* If xTask is NULL then set the calling task's hook. */
3021 pxTCB = prvGetTCBFromHandle( xTask );
3023 /* Save the hook function in the TCB. A critical section is required as
3024 * the value can be accessed from an interrupt. */
3025 uxSavedInterruptStatus = portSET_INTERRUPT_MASK_FROM_ISR();
3027 xReturn = pxTCB->pxTaskTag;
3029 portCLEAR_INTERRUPT_MASK_FROM_ISR( uxSavedInterruptStatus );
3034 #endif /* configUSE_APPLICATION_TASK_TAG */
3035 /*-----------------------------------------------------------*/
3037 #if ( configUSE_APPLICATION_TASK_TAG == 1 )
3039 BaseType_t xTaskCallApplicationTaskHook( TaskHandle_t xTask,
3040 void * pvParameter )
3045 /* If xTask is NULL then we are calling our own task hook. */
3048 xTCB = pxCurrentTCB;
3055 if( xTCB->pxTaskTag != NULL )
3057 xReturn = xTCB->pxTaskTag( pvParameter );
3067 #endif /* configUSE_APPLICATION_TASK_TAG */
3068 /*-----------------------------------------------------------*/
3070 void vTaskSwitchContext( void )
3072 if( uxSchedulerSuspended != ( UBaseType_t ) 0U )
3074 /* The scheduler is currently suspended - do not allow a context
3076 xYieldPending = pdTRUE;
3080 xYieldPending = pdFALSE;
3081 traceTASK_SWITCHED_OUT();
3083 #if ( configGENERATE_RUN_TIME_STATS == 1 )
3085 #ifdef portALT_GET_RUN_TIME_COUNTER_VALUE
3086 portALT_GET_RUN_TIME_COUNTER_VALUE( ulTotalRunTime );
3088 ulTotalRunTime = ( configRUN_TIME_COUNTER_TYPE ) portGET_RUN_TIME_COUNTER_VALUE();
3091 /* Add the amount of time the task has been running to the
3092 * accumulated time so far. The time the task started running was
3093 * stored in ulTaskSwitchedInTime. Note that there is no overflow
3094 * protection here so count values are only valid until the timer
3095 * overflows. The guard against negative values is to protect
3096 * against suspect run time stat counter implementations - which
3097 * are provided by the application, not the kernel. */
3098 if( ulTotalRunTime > ulTaskSwitchedInTime )
3100 pxCurrentTCB->ulRunTimeCounter += ( ulTotalRunTime - ulTaskSwitchedInTime );
3104 mtCOVERAGE_TEST_MARKER();
3107 ulTaskSwitchedInTime = ulTotalRunTime;
3109 #endif /* configGENERATE_RUN_TIME_STATS */
3111 /* Check for stack overflow, if configured. */
3112 taskCHECK_FOR_STACK_OVERFLOW();
3114 /* Before the currently running task is switched out, save its errno. */
3115 #if ( configUSE_POSIX_ERRNO == 1 )
3117 pxCurrentTCB->iTaskErrno = FreeRTOS_errno;
3121 /* Select a new task to run using either the generic C or port
3122 * optimised asm code. */
3123 taskSELECT_HIGHEST_PRIORITY_TASK(); /*lint !e9079 void * is used as this macro is used with timers and co-routines too. Alignment is known to be fine as the type of the pointer stored and retrieved is the same. */
3124 traceTASK_SWITCHED_IN();
3126 /* After the new task is switched in, update the global errno. */
3127 #if ( configUSE_POSIX_ERRNO == 1 )
3129 FreeRTOS_errno = pxCurrentTCB->iTaskErrno;
3133 #if ( configUSE_C_RUNTIME_TLS_SUPPORT == 1 )
3135 /* Switch C-Runtime's TLS Block to point to the TLS
3136 * Block specific to this task. */
3137 configSET_TLS_BLOCK( pxCurrentTCB->xTLSBlock );
3142 /*-----------------------------------------------------------*/
3144 void vTaskPlaceOnEventList( List_t * const pxEventList,
3145 const TickType_t xTicksToWait )
3147 configASSERT( pxEventList );
3149 /* THIS FUNCTION MUST BE CALLED WITH EITHER INTERRUPTS DISABLED OR THE
3150 * SCHEDULER SUSPENDED AND THE QUEUE BEING ACCESSED LOCKED. */
3152 /* Place the event list item of the TCB in the appropriate event list.
3153 * This is placed in the list in priority order so the highest priority task
3154 * is the first to be woken by the event.
3156 * Note: Lists are sorted in ascending order by ListItem_t.xItemValue.
3157 * Normally, the xItemValue of a TCB's ListItem_t members is:
3158 * xItemValue = ( configMAX_PRIORITIES - uxPriority )
3159 * Therefore, the event list is sorted in descending priority order.
3161 * The queue that contains the event list is locked, preventing
3162 * simultaneous access from interrupts. */
3163 vListInsert( pxEventList, &( pxCurrentTCB->xEventListItem ) );
3165 prvAddCurrentTaskToDelayedList( xTicksToWait, pdTRUE );
3167 /*-----------------------------------------------------------*/
3169 void vTaskPlaceOnUnorderedEventList( List_t * pxEventList,
3170 const TickType_t xItemValue,
3171 const TickType_t xTicksToWait )
3173 configASSERT( pxEventList );
3175 /* THIS FUNCTION MUST BE CALLED WITH THE SCHEDULER SUSPENDED. It is used by
3176 * the event groups implementation. */
3177 configASSERT( uxSchedulerSuspended != ( UBaseType_t ) 0U );
3179 /* Store the item value in the event list item. It is safe to access the
3180 * event list item here as interrupts won't access the event list item of a
3181 * task that is not in the Blocked state. */
3182 listSET_LIST_ITEM_VALUE( &( pxCurrentTCB->xEventListItem ), xItemValue | taskEVENT_LIST_ITEM_VALUE_IN_USE );
3184 /* Place the event list item of the TCB at the end of the appropriate event
3185 * list. It is safe to access the event list here because it is part of an
3186 * event group implementation - and interrupts don't access event groups
3187 * directly (instead they access them indirectly by pending function calls to
3188 * the task level). */
3189 listINSERT_END( pxEventList, &( pxCurrentTCB->xEventListItem ) );
3191 prvAddCurrentTaskToDelayedList( xTicksToWait, pdTRUE );
3193 /*-----------------------------------------------------------*/
3195 #if ( configUSE_TIMERS == 1 )
3197 void vTaskPlaceOnEventListRestricted( List_t * const pxEventList,
3198 TickType_t xTicksToWait,
3199 const BaseType_t xWaitIndefinitely )
3201 configASSERT( pxEventList );
3203 /* This function should not be called by application code hence the
3204 * 'Restricted' in its name. It is not part of the public API. It is
3205 * designed for use by kernel code, and has special calling requirements -
3206 * it should be called with the scheduler suspended. */
3209 /* Place the event list item of the TCB in the appropriate event list.
3210 * In this case it is assume that this is the only task that is going to
3211 * be waiting on this event list, so the faster vListInsertEnd() function
3212 * can be used in place of vListInsert. */
3213 listINSERT_END( pxEventList, &( pxCurrentTCB->xEventListItem ) );
3215 /* If the task should block indefinitely then set the block time to a
3216 * value that will be recognised as an indefinite delay inside the
3217 * prvAddCurrentTaskToDelayedList() function. */
3218 if( xWaitIndefinitely != pdFALSE )
3220 xTicksToWait = portMAX_DELAY;
3223 traceTASK_DELAY_UNTIL( ( xTickCount + xTicksToWait ) );
3224 prvAddCurrentTaskToDelayedList( xTicksToWait, xWaitIndefinitely );
3227 #endif /* configUSE_TIMERS */
3228 /*-----------------------------------------------------------*/
3230 BaseType_t xTaskRemoveFromEventList( const List_t * const pxEventList )
3232 TCB_t * pxUnblockedTCB;
3235 /* THIS FUNCTION MUST BE CALLED FROM A CRITICAL SECTION. It can also be
3236 * called from a critical section within an ISR. */
3238 /* The event list is sorted in priority order, so the first in the list can
3239 * be removed as it is known to be the highest priority. Remove the TCB from
3240 * the delayed list, and add it to the ready list.
3242 * If an event is for a queue that is locked then this function will never
3243 * get called - the lock count on the queue will get modified instead. This
3244 * means exclusive access to the event list is guaranteed here.
3246 * This function assumes that a check has already been made to ensure that
3247 * pxEventList is not empty. */
3248 pxUnblockedTCB = listGET_OWNER_OF_HEAD_ENTRY( pxEventList ); /*lint !e9079 void * is used as this macro is used with timers and co-routines too. Alignment is known to be fine as the type of the pointer stored and retrieved is the same. */
3249 configASSERT( pxUnblockedTCB );
3250 listREMOVE_ITEM( &( pxUnblockedTCB->xEventListItem ) );
3252 if( uxSchedulerSuspended == ( UBaseType_t ) 0U )
3254 listREMOVE_ITEM( &( pxUnblockedTCB->xStateListItem ) );
3255 prvAddTaskToReadyList( pxUnblockedTCB );
3257 #if ( configUSE_TICKLESS_IDLE != 0 )
3259 /* If a task is blocked on a kernel object then xNextTaskUnblockTime
3260 * might be set to the blocked task's time out time. If the task is
3261 * unblocked for a reason other than a timeout xNextTaskUnblockTime is
3262 * normally left unchanged, because it is automatically reset to a new
3263 * value when the tick count equals xNextTaskUnblockTime. However if
3264 * tickless idling is used it might be more important to enter sleep mode
3265 * at the earliest possible time - so reset xNextTaskUnblockTime here to
3266 * ensure it is updated at the earliest possible time. */
3267 prvResetNextTaskUnblockTime();
3273 /* The delayed and ready lists cannot be accessed, so hold this task
3274 * pending until the scheduler is resumed. */
3275 listINSERT_END( &( xPendingReadyList ), &( pxUnblockedTCB->xEventListItem ) );
3278 if( pxUnblockedTCB->uxPriority > pxCurrentTCB->uxPriority )
3280 /* Return true if the task removed from the event list has a higher
3281 * priority than the calling task. This allows the calling task to know if
3282 * it should force a context switch now. */
3285 /* Mark that a yield is pending in case the user is not using the
3286 * "xHigherPriorityTaskWoken" parameter to an ISR safe FreeRTOS function. */
3287 xYieldPending = pdTRUE;
3296 /*-----------------------------------------------------------*/
3298 void vTaskRemoveFromUnorderedEventList( ListItem_t * pxEventListItem,
3299 const TickType_t xItemValue )
3301 TCB_t * pxUnblockedTCB;
3303 /* THIS FUNCTION MUST BE CALLED WITH THE SCHEDULER SUSPENDED. It is used by
3304 * the event flags implementation. */
3305 configASSERT( uxSchedulerSuspended != ( UBaseType_t ) 0U );
3307 /* Store the new item value in the event list. */
3308 listSET_LIST_ITEM_VALUE( pxEventListItem, xItemValue | taskEVENT_LIST_ITEM_VALUE_IN_USE );
3310 /* Remove the event list form the event flag. Interrupts do not access
3312 pxUnblockedTCB = listGET_LIST_ITEM_OWNER( pxEventListItem ); /*lint !e9079 void * is used as this macro is used with timers and co-routines too. Alignment is known to be fine as the type of the pointer stored and retrieved is the same. */
3313 configASSERT( pxUnblockedTCB );
3314 listREMOVE_ITEM( pxEventListItem );
3316 #if ( configUSE_TICKLESS_IDLE != 0 )
3318 /* If a task is blocked on a kernel object then xNextTaskUnblockTime
3319 * might be set to the blocked task's time out time. If the task is
3320 * unblocked for a reason other than a timeout xNextTaskUnblockTime is
3321 * normally left unchanged, because it is automatically reset to a new
3322 * value when the tick count equals xNextTaskUnblockTime. However if
3323 * tickless idling is used it might be more important to enter sleep mode
3324 * at the earliest possible time - so reset xNextTaskUnblockTime here to
3325 * ensure it is updated at the earliest possible time. */
3326 prvResetNextTaskUnblockTime();
3330 /* Remove the task from the delayed list and add it to the ready list. The
3331 * scheduler is suspended so interrupts will not be accessing the ready
3333 listREMOVE_ITEM( &( pxUnblockedTCB->xStateListItem ) );
3334 prvAddTaskToReadyList( pxUnblockedTCB );
3336 if( pxUnblockedTCB->uxPriority > pxCurrentTCB->uxPriority )
3338 /* The unblocked task has a priority above that of the calling task, so
3339 * a context switch is required. This function is called with the
3340 * scheduler suspended so xYieldPending is set so the context switch
3341 * occurs immediately that the scheduler is resumed (unsuspended). */
3342 xYieldPending = pdTRUE;
3345 /*-----------------------------------------------------------*/
3347 void vTaskSetTimeOutState( TimeOut_t * const pxTimeOut )
3349 configASSERT( pxTimeOut );
3350 taskENTER_CRITICAL();
3352 pxTimeOut->xOverflowCount = xNumOfOverflows;
3353 pxTimeOut->xTimeOnEntering = xTickCount;
3355 taskEXIT_CRITICAL();
3357 /*-----------------------------------------------------------*/
3359 void vTaskInternalSetTimeOutState( TimeOut_t * const pxTimeOut )
3361 /* For internal use only as it does not use a critical section. */
3362 pxTimeOut->xOverflowCount = xNumOfOverflows;
3363 pxTimeOut->xTimeOnEntering = xTickCount;
3365 /*-----------------------------------------------------------*/
3367 BaseType_t xTaskCheckForTimeOut( TimeOut_t * const pxTimeOut,
3368 TickType_t * const pxTicksToWait )
3372 configASSERT( pxTimeOut );
3373 configASSERT( pxTicksToWait );
3375 taskENTER_CRITICAL();
3377 /* Minor optimisation. The tick count cannot change in this block. */
3378 const TickType_t xConstTickCount = xTickCount;
3379 const TickType_t xElapsedTime = xConstTickCount - pxTimeOut->xTimeOnEntering;
3381 #if ( INCLUDE_xTaskAbortDelay == 1 )
3382 if( pxCurrentTCB->ucDelayAborted != ( uint8_t ) pdFALSE )
3384 /* The delay was aborted, which is not the same as a time out,
3385 * but has the same result. */
3386 pxCurrentTCB->ucDelayAborted = pdFALSE;
3392 #if ( INCLUDE_vTaskSuspend == 1 )
3393 if( *pxTicksToWait == portMAX_DELAY )
3395 /* If INCLUDE_vTaskSuspend is set to 1 and the block time
3396 * specified is the maximum block time then the task should block
3397 * indefinitely, and therefore never time out. */
3403 if( ( xNumOfOverflows != pxTimeOut->xOverflowCount ) && ( xConstTickCount >= pxTimeOut->xTimeOnEntering ) ) /*lint !e525 Indentation preferred as is to make code within pre-processor directives clearer. */
3405 /* The tick count is greater than the time at which
3406 * vTaskSetTimeout() was called, but has also overflowed since
3407 * vTaskSetTimeOut() was called. It must have wrapped all the way
3408 * around and gone past again. This passed since vTaskSetTimeout()
3411 *pxTicksToWait = ( TickType_t ) 0;
3413 else if( xElapsedTime < *pxTicksToWait ) /*lint !e961 Explicit casting is only redundant with some compilers, whereas others require it to prevent integer conversion errors. */
3415 /* Not a genuine timeout. Adjust parameters for time remaining. */
3416 *pxTicksToWait -= xElapsedTime;
3417 vTaskInternalSetTimeOutState( pxTimeOut );
3422 *pxTicksToWait = ( TickType_t ) 0;
3426 taskEXIT_CRITICAL();
3430 /*-----------------------------------------------------------*/
3432 void vTaskMissedYield( void )
3434 xYieldPending = pdTRUE;
3436 /*-----------------------------------------------------------*/
3438 #if ( configUSE_TRACE_FACILITY == 1 )
3440 UBaseType_t uxTaskGetTaskNumber( TaskHandle_t xTask )
3442 UBaseType_t uxReturn;
3443 TCB_t const * pxTCB;
3448 uxReturn = pxTCB->uxTaskNumber;
3458 #endif /* configUSE_TRACE_FACILITY */
3459 /*-----------------------------------------------------------*/
3461 #if ( configUSE_TRACE_FACILITY == 1 )
3463 void vTaskSetTaskNumber( TaskHandle_t xTask,
3464 const UBaseType_t uxHandle )
3471 pxTCB->uxTaskNumber = uxHandle;
3475 #endif /* configUSE_TRACE_FACILITY */
3478 * -----------------------------------------------------------
3480 * ----------------------------------------------------------
3482 * The portTASK_FUNCTION() macro is used to allow port/compiler specific
3483 * language extensions. The equivalent prototype for this function is:
3485 * void prvIdleTask( void *pvParameters );
3489 static portTASK_FUNCTION( prvIdleTask, pvParameters )
3491 /* Stop warnings. */
3492 ( void ) pvParameters;
3494 /** THIS IS THE RTOS IDLE TASK - WHICH IS CREATED AUTOMATICALLY WHEN THE
3495 * SCHEDULER IS STARTED. **/
3497 /* In case a task that has a secure context deletes itself, in which case
3498 * the idle task is responsible for deleting the task's secure context, if
3500 portALLOCATE_SECURE_CONTEXT( configMINIMAL_SECURE_STACK_SIZE );
3504 /* See if any tasks have deleted themselves - if so then the idle task
3505 * is responsible for freeing the deleted task's TCB and stack. */
3506 prvCheckTasksWaitingTermination();
3508 #if ( configUSE_PREEMPTION == 0 )
3510 /* If we are not using preemption we keep forcing a task switch to
3511 * see if any other task has become available. If we are using
3512 * preemption we don't need to do this as any task becoming available
3513 * will automatically get the processor anyway. */
3516 #endif /* configUSE_PREEMPTION */
3518 #if ( ( configUSE_PREEMPTION == 1 ) && ( configIDLE_SHOULD_YIELD == 1 ) )
3520 /* When using preemption tasks of equal priority will be
3521 * timesliced. If a task that is sharing the idle priority is ready
3522 * to run then the idle task should yield before the end of the
3525 * A critical region is not required here as we are just reading from
3526 * the list, and an occasional incorrect value will not matter. If
3527 * the ready list at the idle priority contains more than one task
3528 * then a task other than the idle task is ready to execute. */
3529 if( listCURRENT_LIST_LENGTH( &( pxReadyTasksLists[ tskIDLE_PRIORITY ] ) ) > ( UBaseType_t ) 1 )
3535 mtCOVERAGE_TEST_MARKER();
3538 #endif /* ( ( configUSE_PREEMPTION == 1 ) && ( configIDLE_SHOULD_YIELD == 1 ) ) */
3540 #if ( configUSE_IDLE_HOOK == 1 )
3542 /* Call the user defined function from within the idle task. */
3543 vApplicationIdleHook();
3545 #endif /* configUSE_IDLE_HOOK */
3547 /* This conditional compilation should use inequality to 0, not equality
3548 * to 1. This is to ensure portSUPPRESS_TICKS_AND_SLEEP() is called when
3549 * user defined low power mode implementations require
3550 * configUSE_TICKLESS_IDLE to be set to a value other than 1. */
3551 #if ( configUSE_TICKLESS_IDLE != 0 )
3553 TickType_t xExpectedIdleTime;
3555 /* It is not desirable to suspend then resume the scheduler on
3556 * each iteration of the idle task. Therefore, a preliminary
3557 * test of the expected idle time is performed without the
3558 * scheduler suspended. The result here is not necessarily
3560 xExpectedIdleTime = prvGetExpectedIdleTime();
3562 if( xExpectedIdleTime >= configEXPECTED_IDLE_TIME_BEFORE_SLEEP )
3566 /* Now the scheduler is suspended, the expected idle
3567 * time can be sampled again, and this time its value can
3569 configASSERT( xNextTaskUnblockTime >= xTickCount );
3570 xExpectedIdleTime = prvGetExpectedIdleTime();
3572 /* Define the following macro to set xExpectedIdleTime to 0
3573 * if the application does not want
3574 * portSUPPRESS_TICKS_AND_SLEEP() to be called. */
3575 configPRE_SUPPRESS_TICKS_AND_SLEEP_PROCESSING( xExpectedIdleTime );
3577 if( xExpectedIdleTime >= configEXPECTED_IDLE_TIME_BEFORE_SLEEP )
3579 traceLOW_POWER_IDLE_BEGIN();
3580 portSUPPRESS_TICKS_AND_SLEEP( xExpectedIdleTime );
3581 traceLOW_POWER_IDLE_END();
3585 mtCOVERAGE_TEST_MARKER();
3588 ( void ) xTaskResumeAll();
3592 mtCOVERAGE_TEST_MARKER();
3595 #endif /* configUSE_TICKLESS_IDLE */
3598 /*-----------------------------------------------------------*/
3600 #if ( configUSE_TICKLESS_IDLE != 0 )
3602 eSleepModeStatus eTaskConfirmSleepModeStatus( void )
3604 #if ( INCLUDE_vTaskSuspend == 1 )
3605 /* The idle task exists in addition to the application tasks. */
3606 const UBaseType_t uxNonApplicationTasks = 1;
3607 #endif /* INCLUDE_vTaskSuspend */
3609 eSleepModeStatus eReturn = eStandardSleep;
3611 /* This function must be called from a critical section. */
3613 if( listCURRENT_LIST_LENGTH( &xPendingReadyList ) != 0 )
3615 /* A task was made ready while the scheduler was suspended. */
3616 eReturn = eAbortSleep;
3618 else if( xYieldPending != pdFALSE )
3620 /* A yield was pended while the scheduler was suspended. */
3621 eReturn = eAbortSleep;
3623 else if( xPendedTicks != 0 )
3625 /* A tick interrupt has already occurred but was held pending
3626 * because the scheduler is suspended. */
3627 eReturn = eAbortSleep;
3630 #if ( INCLUDE_vTaskSuspend == 1 )
3631 else if( listCURRENT_LIST_LENGTH( &xSuspendedTaskList ) == ( uxCurrentNumberOfTasks - uxNonApplicationTasks ) )
3633 /* If all the tasks are in the suspended list (which might mean they
3634 * have an infinite block time rather than actually being suspended)
3635 * then it is safe to turn all clocks off and just wait for external
3637 eReturn = eNoTasksWaitingTimeout;
3639 #endif /* INCLUDE_vTaskSuspend */
3642 mtCOVERAGE_TEST_MARKER();
3648 #endif /* configUSE_TICKLESS_IDLE */
3649 /*-----------------------------------------------------------*/
3651 #if ( configNUM_THREAD_LOCAL_STORAGE_POINTERS != 0 )
3653 void vTaskSetThreadLocalStoragePointer( TaskHandle_t xTaskToSet,
3659 if( ( xIndex >= 0 ) &&
3660 ( xIndex < configNUM_THREAD_LOCAL_STORAGE_POINTERS ) )
3662 pxTCB = prvGetTCBFromHandle( xTaskToSet );
3663 configASSERT( pxTCB != NULL );
3664 pxTCB->pvThreadLocalStoragePointers[ xIndex ] = pvValue;
3668 #endif /* configNUM_THREAD_LOCAL_STORAGE_POINTERS */
3669 /*-----------------------------------------------------------*/
3671 #if ( configNUM_THREAD_LOCAL_STORAGE_POINTERS != 0 )
3673 void * pvTaskGetThreadLocalStoragePointer( TaskHandle_t xTaskToQuery,
3676 void * pvReturn = NULL;
3679 if( ( xIndex >= 0 ) &&
3680 ( xIndex < configNUM_THREAD_LOCAL_STORAGE_POINTERS ) )
3682 pxTCB = prvGetTCBFromHandle( xTaskToQuery );
3683 pvReturn = pxTCB->pvThreadLocalStoragePointers[ xIndex ];
3693 #endif /* configNUM_THREAD_LOCAL_STORAGE_POINTERS */
3694 /*-----------------------------------------------------------*/
3696 #if ( portUSING_MPU_WRAPPERS == 1 )
3698 void vTaskAllocateMPURegions( TaskHandle_t xTaskToModify,
3699 const MemoryRegion_t * const xRegions )
3703 /* If null is passed in here then we are modifying the MPU settings of
3704 * the calling task. */
3705 pxTCB = prvGetTCBFromHandle( xTaskToModify );
3707 vPortStoreTaskMPUSettings( &( pxTCB->xMPUSettings ), xRegions, NULL, 0 );
3710 #endif /* portUSING_MPU_WRAPPERS */
3711 /*-----------------------------------------------------------*/
3713 static void prvInitialiseTaskLists( void )
3715 UBaseType_t uxPriority;
3717 for( uxPriority = ( UBaseType_t ) 0U; uxPriority < ( UBaseType_t ) configMAX_PRIORITIES; uxPriority++ )
3719 vListInitialise( &( pxReadyTasksLists[ uxPriority ] ) );
3722 vListInitialise( &xDelayedTaskList1 );
3723 vListInitialise( &xDelayedTaskList2 );
3724 vListInitialise( &xPendingReadyList );
3726 #if ( INCLUDE_vTaskDelete == 1 )
3728 vListInitialise( &xTasksWaitingTermination );
3730 #endif /* INCLUDE_vTaskDelete */
3732 #if ( INCLUDE_vTaskSuspend == 1 )
3734 vListInitialise( &xSuspendedTaskList );
3736 #endif /* INCLUDE_vTaskSuspend */
3738 /* Start with pxDelayedTaskList using list1 and the pxOverflowDelayedTaskList
3740 pxDelayedTaskList = &xDelayedTaskList1;
3741 pxOverflowDelayedTaskList = &xDelayedTaskList2;
3743 /*-----------------------------------------------------------*/
3745 static void prvCheckTasksWaitingTermination( void )
3747 /** THIS FUNCTION IS CALLED FROM THE RTOS IDLE TASK **/
3749 #if ( INCLUDE_vTaskDelete == 1 )
3753 /* uxDeletedTasksWaitingCleanUp is used to prevent taskENTER_CRITICAL()
3754 * being called too often in the idle task. */
3755 while( uxDeletedTasksWaitingCleanUp > ( UBaseType_t ) 0U )
3757 taskENTER_CRITICAL();
3759 pxTCB = listGET_OWNER_OF_HEAD_ENTRY( ( &xTasksWaitingTermination ) ); /*lint !e9079 void * is used as this macro is used with timers and co-routines too. Alignment is known to be fine as the type of the pointer stored and retrieved is the same. */
3760 ( void ) uxListRemove( &( pxTCB->xStateListItem ) );
3761 --uxCurrentNumberOfTasks;
3762 --uxDeletedTasksWaitingCleanUp;
3764 taskEXIT_CRITICAL();
3766 prvDeleteTCB( pxTCB );
3769 #endif /* INCLUDE_vTaskDelete */
3771 /*-----------------------------------------------------------*/
3773 #if ( configUSE_TRACE_FACILITY == 1 )
3775 void vTaskGetInfo( TaskHandle_t xTask,
3776 TaskStatus_t * pxTaskStatus,
3777 BaseType_t xGetFreeStackSpace,
3782 /* xTask is NULL then get the state of the calling task. */
3783 pxTCB = prvGetTCBFromHandle( xTask );
3785 pxTaskStatus->xHandle = ( TaskHandle_t ) pxTCB;
3786 pxTaskStatus->pcTaskName = ( const char * ) &( pxTCB->pcTaskName[ 0 ] );
3787 pxTaskStatus->uxCurrentPriority = pxTCB->uxPriority;
3788 pxTaskStatus->pxStackBase = pxTCB->pxStack;
3789 #if ( ( portSTACK_GROWTH > 0 ) && ( configRECORD_STACK_HIGH_ADDRESS == 1 ) )
3790 pxTaskStatus->pxTopOfStack = pxTCB->pxTopOfStack;
3791 pxTaskStatus->pxEndOfStack = pxTCB->pxEndOfStack;
3793 pxTaskStatus->xTaskNumber = pxTCB->uxTCBNumber;
3795 #if ( configUSE_MUTEXES == 1 )
3797 pxTaskStatus->uxBasePriority = pxTCB->uxBasePriority;
3801 pxTaskStatus->uxBasePriority = 0;
3805 #if ( configGENERATE_RUN_TIME_STATS == 1 )
3807 pxTaskStatus->ulRunTimeCounter = pxTCB->ulRunTimeCounter;
3811 pxTaskStatus->ulRunTimeCounter = ( configRUN_TIME_COUNTER_TYPE ) 0;
3815 /* Obtaining the task state is a little fiddly, so is only done if the
3816 * value of eState passed into this function is eInvalid - otherwise the
3817 * state is just set to whatever is passed in. */
3818 if( eState != eInvalid )
3820 if( pxTCB == pxCurrentTCB )
3822 pxTaskStatus->eCurrentState = eRunning;
3826 pxTaskStatus->eCurrentState = eState;
3828 #if ( INCLUDE_vTaskSuspend == 1 )
3830 /* If the task is in the suspended list then there is a
3831 * chance it is actually just blocked indefinitely - so really
3832 * it should be reported as being in the Blocked state. */
3833 if( eState == eSuspended )
3837 if( listLIST_ITEM_CONTAINER( &( pxTCB->xEventListItem ) ) != NULL )
3839 pxTaskStatus->eCurrentState = eBlocked;
3842 ( void ) xTaskResumeAll();
3845 #endif /* INCLUDE_vTaskSuspend */
3850 pxTaskStatus->eCurrentState = eTaskGetState( pxTCB );
3853 /* Obtaining the stack space takes some time, so the xGetFreeStackSpace
3854 * parameter is provided to allow it to be skipped. */
3855 if( xGetFreeStackSpace != pdFALSE )
3857 #if ( portSTACK_GROWTH > 0 )
3859 pxTaskStatus->usStackHighWaterMark = prvTaskCheckFreeStackSpace( ( uint8_t * ) pxTCB->pxEndOfStack );
3863 pxTaskStatus->usStackHighWaterMark = prvTaskCheckFreeStackSpace( ( uint8_t * ) pxTCB->pxStack );
3869 pxTaskStatus->usStackHighWaterMark = 0;
3873 #endif /* configUSE_TRACE_FACILITY */
3874 /*-----------------------------------------------------------*/
3876 #if ( configUSE_TRACE_FACILITY == 1 )
3878 static UBaseType_t prvListTasksWithinSingleList( TaskStatus_t * pxTaskStatusArray,
3882 configLIST_VOLATILE TCB_t * pxNextTCB;
3883 configLIST_VOLATILE TCB_t * pxFirstTCB;
3884 UBaseType_t uxTask = 0;
3886 if( listCURRENT_LIST_LENGTH( pxList ) > ( UBaseType_t ) 0 )
3888 listGET_OWNER_OF_NEXT_ENTRY( pxFirstTCB, pxList ); /*lint !e9079 void * is used as this macro is used with timers and co-routines too. Alignment is known to be fine as the type of the pointer stored and retrieved is the same. */
3890 /* Populate an TaskStatus_t structure within the
3891 * pxTaskStatusArray array for each task that is referenced from
3892 * pxList. See the definition of TaskStatus_t in task.h for the
3893 * meaning of each TaskStatus_t structure member. */
3896 listGET_OWNER_OF_NEXT_ENTRY( pxNextTCB, pxList ); /*lint !e9079 void * is used as this macro is used with timers and co-routines too. Alignment is known to be fine as the type of the pointer stored and retrieved is the same. */
3897 vTaskGetInfo( ( TaskHandle_t ) pxNextTCB, &( pxTaskStatusArray[ uxTask ] ), pdTRUE, eState );
3899 } while( pxNextTCB != pxFirstTCB );
3903 mtCOVERAGE_TEST_MARKER();
3909 #endif /* configUSE_TRACE_FACILITY */
3910 /*-----------------------------------------------------------*/
3912 #if ( ( configUSE_TRACE_FACILITY == 1 ) || ( INCLUDE_uxTaskGetStackHighWaterMark == 1 ) || ( INCLUDE_uxTaskGetStackHighWaterMark2 == 1 ) )
3914 static configSTACK_DEPTH_TYPE prvTaskCheckFreeStackSpace( const uint8_t * pucStackByte )
3916 uint32_t ulCount = 0U;
3918 while( *pucStackByte == ( uint8_t ) tskSTACK_FILL_BYTE )
3920 pucStackByte -= portSTACK_GROWTH;
3924 ulCount /= ( uint32_t ) sizeof( StackType_t ); /*lint !e961 Casting is not redundant on smaller architectures. */
3926 return ( configSTACK_DEPTH_TYPE ) ulCount;
3929 #endif /* ( ( configUSE_TRACE_FACILITY == 1 ) || ( INCLUDE_uxTaskGetStackHighWaterMark == 1 ) || ( INCLUDE_uxTaskGetStackHighWaterMark2 == 1 ) ) */
3930 /*-----------------------------------------------------------*/
3932 #if ( INCLUDE_uxTaskGetStackHighWaterMark2 == 1 )
3934 /* uxTaskGetStackHighWaterMark() and uxTaskGetStackHighWaterMark2() are the
3935 * same except for their return type. Using configSTACK_DEPTH_TYPE allows the
3936 * user to determine the return type. It gets around the problem of the value
3937 * overflowing on 8-bit types without breaking backward compatibility for
3938 * applications that expect an 8-bit return type. */
3939 configSTACK_DEPTH_TYPE uxTaskGetStackHighWaterMark2( TaskHandle_t xTask )
3942 uint8_t * pucEndOfStack;
3943 configSTACK_DEPTH_TYPE uxReturn;
3945 /* uxTaskGetStackHighWaterMark() and uxTaskGetStackHighWaterMark2() are
3946 * the same except for their return type. Using configSTACK_DEPTH_TYPE
3947 * allows the user to determine the return type. It gets around the
3948 * problem of the value overflowing on 8-bit types without breaking
3949 * backward compatibility for applications that expect an 8-bit return
3952 pxTCB = prvGetTCBFromHandle( xTask );
3954 #if portSTACK_GROWTH < 0
3956 pucEndOfStack = ( uint8_t * ) pxTCB->pxStack;
3960 pucEndOfStack = ( uint8_t * ) pxTCB->pxEndOfStack;
3964 uxReturn = prvTaskCheckFreeStackSpace( pucEndOfStack );
3969 #endif /* INCLUDE_uxTaskGetStackHighWaterMark2 */
3970 /*-----------------------------------------------------------*/
3972 #if ( INCLUDE_uxTaskGetStackHighWaterMark == 1 )
3974 UBaseType_t uxTaskGetStackHighWaterMark( TaskHandle_t xTask )
3977 uint8_t * pucEndOfStack;
3978 UBaseType_t uxReturn;
3980 pxTCB = prvGetTCBFromHandle( xTask );
3982 #if portSTACK_GROWTH < 0
3984 pucEndOfStack = ( uint8_t * ) pxTCB->pxStack;
3988 pucEndOfStack = ( uint8_t * ) pxTCB->pxEndOfStack;
3992 uxReturn = ( UBaseType_t ) prvTaskCheckFreeStackSpace( pucEndOfStack );
3997 #endif /* INCLUDE_uxTaskGetStackHighWaterMark */
3998 /*-----------------------------------------------------------*/
4000 #if ( INCLUDE_vTaskDelete == 1 )
4002 static void prvDeleteTCB( TCB_t * pxTCB )
4004 /* This call is required specifically for the TriCore port. It must be
4005 * above the vPortFree() calls. The call is also used by ports/demos that
4006 * want to allocate and clean RAM statically. */
4007 portCLEAN_UP_TCB( pxTCB );
4009 #if ( configUSE_C_RUNTIME_TLS_SUPPORT == 1 )
4011 /* Free up the memory allocated for the task's TLS Block. */
4012 configDEINIT_TLS_BLOCK( pxCurrentTCB->xTLSBlock );
4016 #if ( ( configSUPPORT_DYNAMIC_ALLOCATION == 1 ) && ( configSUPPORT_STATIC_ALLOCATION == 0 ) && ( portUSING_MPU_WRAPPERS == 0 ) )
4018 /* The task can only have been allocated dynamically - free both
4019 * the stack and TCB. */
4020 vPortFreeStack( pxTCB->pxStack );
4023 #elif ( tskSTATIC_AND_DYNAMIC_ALLOCATION_POSSIBLE != 0 ) /*lint !e731 !e9029 Macro has been consolidated for readability reasons. */
4025 /* The task could have been allocated statically or dynamically, so
4026 * check what was statically allocated before trying to free the
4028 if( pxTCB->ucStaticallyAllocated == tskDYNAMICALLY_ALLOCATED_STACK_AND_TCB )
4030 /* Both the stack and TCB were allocated dynamically, so both
4032 vPortFreeStack( pxTCB->pxStack );
4035 else if( pxTCB->ucStaticallyAllocated == tskSTATICALLY_ALLOCATED_STACK_ONLY )
4037 /* Only the stack was statically allocated, so the TCB is the
4038 * only memory that must be freed. */
4043 /* Neither the stack nor the TCB were allocated dynamically, so
4044 * nothing needs to be freed. */
4045 configASSERT( pxTCB->ucStaticallyAllocated == tskSTATICALLY_ALLOCATED_STACK_AND_TCB );
4046 mtCOVERAGE_TEST_MARKER();
4049 #endif /* configSUPPORT_DYNAMIC_ALLOCATION */
4052 #endif /* INCLUDE_vTaskDelete */
4053 /*-----------------------------------------------------------*/
4055 static void prvResetNextTaskUnblockTime( void )
4057 if( listLIST_IS_EMPTY( pxDelayedTaskList ) != pdFALSE )
4059 /* The new current delayed list is empty. Set xNextTaskUnblockTime to
4060 * the maximum possible value so it is extremely unlikely that the
4061 * if( xTickCount >= xNextTaskUnblockTime ) test will pass until
4062 * there is an item in the delayed list. */
4063 xNextTaskUnblockTime = portMAX_DELAY;
4067 /* The new current delayed list is not empty, get the value of
4068 * the item at the head of the delayed list. This is the time at
4069 * which the task at the head of the delayed list should be removed
4070 * from the Blocked state. */
4071 xNextTaskUnblockTime = listGET_ITEM_VALUE_OF_HEAD_ENTRY( pxDelayedTaskList );
4074 /*-----------------------------------------------------------*/
4076 #if ( ( INCLUDE_xTaskGetCurrentTaskHandle == 1 ) || ( configUSE_MUTEXES == 1 ) )
4078 TaskHandle_t xTaskGetCurrentTaskHandle( void )
4080 TaskHandle_t xReturn;
4082 /* A critical section is not required as this is not called from
4083 * an interrupt and the current TCB will always be the same for any
4084 * individual execution thread. */
4085 xReturn = pxCurrentTCB;
4090 #endif /* ( ( INCLUDE_xTaskGetCurrentTaskHandle == 1 ) || ( configUSE_MUTEXES == 1 ) ) */
4091 /*-----------------------------------------------------------*/
4093 #if ( ( INCLUDE_xTaskGetSchedulerState == 1 ) || ( configUSE_TIMERS == 1 ) )
4095 BaseType_t xTaskGetSchedulerState( void )
4099 if( xSchedulerRunning == pdFALSE )
4101 xReturn = taskSCHEDULER_NOT_STARTED;
4105 if( uxSchedulerSuspended == ( UBaseType_t ) 0U )
4107 xReturn = taskSCHEDULER_RUNNING;
4111 xReturn = taskSCHEDULER_SUSPENDED;
4118 #endif /* ( ( INCLUDE_xTaskGetSchedulerState == 1 ) || ( configUSE_TIMERS == 1 ) ) */
4119 /*-----------------------------------------------------------*/
4121 #if ( configUSE_MUTEXES == 1 )
4123 BaseType_t xTaskPriorityInherit( TaskHandle_t const pxMutexHolder )
4125 TCB_t * const pxMutexHolderTCB = pxMutexHolder;
4126 BaseType_t xReturn = pdFALSE;
4128 /* If the mutex was given back by an interrupt while the queue was
4129 * locked then the mutex holder might now be NULL. _RB_ Is this still
4130 * needed as interrupts can no longer use mutexes? */
4131 if( pxMutexHolder != NULL )
4133 /* If the holder of the mutex has a priority below the priority of
4134 * the task attempting to obtain the mutex then it will temporarily
4135 * inherit the priority of the task attempting to obtain the mutex. */
4136 if( pxMutexHolderTCB->uxPriority < pxCurrentTCB->uxPriority )
4138 /* Adjust the mutex holder state to account for its new
4139 * priority. Only reset the event list item value if the value is
4140 * not being used for anything else. */
4141 if( ( listGET_LIST_ITEM_VALUE( &( pxMutexHolderTCB->xEventListItem ) ) & taskEVENT_LIST_ITEM_VALUE_IN_USE ) == 0UL )
4143 listSET_LIST_ITEM_VALUE( &( pxMutexHolderTCB->xEventListItem ), ( TickType_t ) configMAX_PRIORITIES - ( TickType_t ) pxCurrentTCB->uxPriority ); /*lint !e961 MISRA exception as the casts are only redundant for some ports. */
4147 mtCOVERAGE_TEST_MARKER();
4150 /* If the task being modified is in the ready state it will need
4151 * to be moved into a new list. */
4152 if( listIS_CONTAINED_WITHIN( &( pxReadyTasksLists[ pxMutexHolderTCB->uxPriority ] ), &( pxMutexHolderTCB->xStateListItem ) ) != pdFALSE )
4154 if( uxListRemove( &( pxMutexHolderTCB->xStateListItem ) ) == ( UBaseType_t ) 0 )
4156 /* It is known that the task is in its ready list so
4157 * there is no need to check again and the port level
4158 * reset macro can be called directly. */
4159 portRESET_READY_PRIORITY( pxMutexHolderTCB->uxPriority, uxTopReadyPriority );
4163 mtCOVERAGE_TEST_MARKER();
4166 /* Inherit the priority before being moved into the new list. */
4167 pxMutexHolderTCB->uxPriority = pxCurrentTCB->uxPriority;
4168 prvAddTaskToReadyList( pxMutexHolderTCB );
4172 /* Just inherit the priority. */
4173 pxMutexHolderTCB->uxPriority = pxCurrentTCB->uxPriority;
4176 traceTASK_PRIORITY_INHERIT( pxMutexHolderTCB, pxCurrentTCB->uxPriority );
4178 /* Inheritance occurred. */
4183 if( pxMutexHolderTCB->uxBasePriority < pxCurrentTCB->uxPriority )
4185 /* The base priority of the mutex holder is lower than the
4186 * priority of the task attempting to take the mutex, but the
4187 * current priority of the mutex holder is not lower than the
4188 * priority of the task attempting to take the mutex.
4189 * Therefore the mutex holder must have already inherited a
4190 * priority, but inheritance would have occurred if that had
4191 * not been the case. */
4196 mtCOVERAGE_TEST_MARKER();
4202 mtCOVERAGE_TEST_MARKER();
4208 #endif /* configUSE_MUTEXES */
4209 /*-----------------------------------------------------------*/
4211 #if ( configUSE_MUTEXES == 1 )
4213 BaseType_t xTaskPriorityDisinherit( TaskHandle_t const pxMutexHolder )
4215 TCB_t * const pxTCB = pxMutexHolder;
4216 BaseType_t xReturn = pdFALSE;
4218 if( pxMutexHolder != NULL )
4220 /* A task can only have an inherited priority if it holds the mutex.
4221 * If the mutex is held by a task then it cannot be given from an
4222 * interrupt, and if a mutex is given by the holding task then it must
4223 * be the running state task. */
4224 configASSERT( pxTCB == pxCurrentTCB );
4225 configASSERT( pxTCB->uxMutexesHeld );
4226 ( pxTCB->uxMutexesHeld )--;
4228 /* Has the holder of the mutex inherited the priority of another
4230 if( pxTCB->uxPriority != pxTCB->uxBasePriority )
4232 /* Only disinherit if no other mutexes are held. */
4233 if( pxTCB->uxMutexesHeld == ( UBaseType_t ) 0 )
4235 /* A task can only have an inherited priority if it holds
4236 * the mutex. If the mutex is held by a task then it cannot be
4237 * given from an interrupt, and if a mutex is given by the
4238 * holding task then it must be the running state task. Remove
4239 * the holding task from the ready list. */
4240 if( uxListRemove( &( pxTCB->xStateListItem ) ) == ( UBaseType_t ) 0 )
4242 portRESET_READY_PRIORITY( pxTCB->uxPriority, uxTopReadyPriority );
4246 mtCOVERAGE_TEST_MARKER();
4249 /* Disinherit the priority before adding the task into the
4250 * new ready list. */
4251 traceTASK_PRIORITY_DISINHERIT( pxTCB, pxTCB->uxBasePriority );
4252 pxTCB->uxPriority = pxTCB->uxBasePriority;
4254 /* Reset the event list item value. It cannot be in use for
4255 * any other purpose if this task is running, and it must be
4256 * running to give back the mutex. */
4257 listSET_LIST_ITEM_VALUE( &( pxTCB->xEventListItem ), ( TickType_t ) configMAX_PRIORITIES - ( TickType_t ) pxTCB->uxPriority ); /*lint !e961 MISRA exception as the casts are only redundant for some ports. */
4258 prvAddTaskToReadyList( pxTCB );
4260 /* Return true to indicate that a context switch is required.
4261 * This is only actually required in the corner case whereby
4262 * multiple mutexes were held and the mutexes were given back
4263 * in an order different to that in which they were taken.
4264 * If a context switch did not occur when the first mutex was
4265 * returned, even if a task was waiting on it, then a context
4266 * switch should occur when the last mutex is returned whether
4267 * a task is waiting on it or not. */
4272 mtCOVERAGE_TEST_MARKER();
4277 mtCOVERAGE_TEST_MARKER();
4282 mtCOVERAGE_TEST_MARKER();
4288 #endif /* configUSE_MUTEXES */
4289 /*-----------------------------------------------------------*/
4291 #if ( configUSE_MUTEXES == 1 )
4293 void vTaskPriorityDisinheritAfterTimeout( TaskHandle_t const pxMutexHolder,
4294 UBaseType_t uxHighestPriorityWaitingTask )
4296 TCB_t * const pxTCB = pxMutexHolder;
4297 UBaseType_t uxPriorityUsedOnEntry, uxPriorityToUse;
4298 const UBaseType_t uxOnlyOneMutexHeld = ( UBaseType_t ) 1;
4300 if( pxMutexHolder != NULL )
4302 /* If pxMutexHolder is not NULL then the holder must hold at least
4304 configASSERT( pxTCB->uxMutexesHeld );
4306 /* Determine the priority to which the priority of the task that
4307 * holds the mutex should be set. This will be the greater of the
4308 * holding task's base priority and the priority of the highest
4309 * priority task that is waiting to obtain the mutex. */
4310 if( pxTCB->uxBasePriority < uxHighestPriorityWaitingTask )
4312 uxPriorityToUse = uxHighestPriorityWaitingTask;
4316 uxPriorityToUse = pxTCB->uxBasePriority;
4319 /* Does the priority need to change? */
4320 if( pxTCB->uxPriority != uxPriorityToUse )
4322 /* Only disinherit if no other mutexes are held. This is a
4323 * simplification in the priority inheritance implementation. If
4324 * the task that holds the mutex is also holding other mutexes then
4325 * the other mutexes may have caused the priority inheritance. */
4326 if( pxTCB->uxMutexesHeld == uxOnlyOneMutexHeld )
4328 /* If a task has timed out because it already holds the
4329 * mutex it was trying to obtain then it cannot of inherited
4330 * its own priority. */
4331 configASSERT( pxTCB != pxCurrentTCB );
4333 /* Disinherit the priority, remembering the previous
4334 * priority to facilitate determining the subject task's
4336 traceTASK_PRIORITY_DISINHERIT( pxTCB, uxPriorityToUse );
4337 uxPriorityUsedOnEntry = pxTCB->uxPriority;
4338 pxTCB->uxPriority = uxPriorityToUse;
4340 /* Only reset the event list item value if the value is not
4341 * being used for anything else. */
4342 if( ( listGET_LIST_ITEM_VALUE( &( pxTCB->xEventListItem ) ) & taskEVENT_LIST_ITEM_VALUE_IN_USE ) == 0UL )
4344 listSET_LIST_ITEM_VALUE( &( pxTCB->xEventListItem ), ( TickType_t ) configMAX_PRIORITIES - ( TickType_t ) uxPriorityToUse ); /*lint !e961 MISRA exception as the casts are only redundant for some ports. */
4348 mtCOVERAGE_TEST_MARKER();
4351 /* If the running task is not the task that holds the mutex
4352 * then the task that holds the mutex could be in either the
4353 * Ready, Blocked or Suspended states. Only remove the task
4354 * from its current state list if it is in the Ready state as
4355 * the task's priority is going to change and there is one
4356 * Ready list per priority. */
4357 if( listIS_CONTAINED_WITHIN( &( pxReadyTasksLists[ uxPriorityUsedOnEntry ] ), &( pxTCB->xStateListItem ) ) != pdFALSE )
4359 if( uxListRemove( &( pxTCB->xStateListItem ) ) == ( UBaseType_t ) 0 )
4361 /* It is known that the task is in its ready list so
4362 * there is no need to check again and the port level
4363 * reset macro can be called directly. */
4364 portRESET_READY_PRIORITY( pxTCB->uxPriority, uxTopReadyPriority );
4368 mtCOVERAGE_TEST_MARKER();
4371 prvAddTaskToReadyList( pxTCB );
4375 mtCOVERAGE_TEST_MARKER();
4380 mtCOVERAGE_TEST_MARKER();
4385 mtCOVERAGE_TEST_MARKER();
4390 mtCOVERAGE_TEST_MARKER();
4394 #endif /* configUSE_MUTEXES */
4395 /*-----------------------------------------------------------*/
4397 #if ( portCRITICAL_NESTING_IN_TCB == 1 )
4399 void vTaskEnterCritical( void )
4401 portDISABLE_INTERRUPTS();
4403 if( xSchedulerRunning != pdFALSE )
4405 ( pxCurrentTCB->uxCriticalNesting )++;
4407 /* This is not the interrupt safe version of the enter critical
4408 * function so assert() if it is being called from an interrupt
4409 * context. Only API functions that end in "FromISR" can be used in an
4410 * interrupt. Only assert if the critical nesting count is 1 to
4411 * protect against recursive calls if the assert function also uses a
4412 * critical section. */
4413 if( pxCurrentTCB->uxCriticalNesting == 1 )
4415 portASSERT_IF_IN_ISR();
4420 mtCOVERAGE_TEST_MARKER();
4424 #endif /* portCRITICAL_NESTING_IN_TCB */
4425 /*-----------------------------------------------------------*/
4427 #if ( portCRITICAL_NESTING_IN_TCB == 1 )
4429 void vTaskExitCritical( void )
4431 if( xSchedulerRunning != pdFALSE )
4433 if( pxCurrentTCB->uxCriticalNesting > 0U )
4435 ( pxCurrentTCB->uxCriticalNesting )--;
4437 if( pxCurrentTCB->uxCriticalNesting == 0U )
4439 portENABLE_INTERRUPTS();
4443 mtCOVERAGE_TEST_MARKER();
4448 mtCOVERAGE_TEST_MARKER();
4453 mtCOVERAGE_TEST_MARKER();
4457 #endif /* portCRITICAL_NESTING_IN_TCB */
4458 /*-----------------------------------------------------------*/
4460 #if ( configUSE_STATS_FORMATTING_FUNCTIONS > 0 )
4462 static char * prvWriteNameToBuffer( char * pcBuffer,
4463 const char * pcTaskName )
4467 /* Start by copying the entire string. */
4468 strcpy( pcBuffer, pcTaskName );
4470 /* Pad the end of the string with spaces to ensure columns line up when
4472 for( x = strlen( pcBuffer ); x < ( size_t ) ( configMAX_TASK_NAME_LEN - 1 ); x++ )
4474 pcBuffer[ x ] = ' ';
4478 pcBuffer[ x ] = ( char ) 0x00;
4480 /* Return the new end of string. */
4481 return &( pcBuffer[ x ] );
4484 #endif /* ( configUSE_STATS_FORMATTING_FUNCTIONS > 0 ) */
4485 /*-----------------------------------------------------------*/
4487 #if ( ( configUSE_TRACE_FACILITY == 1 ) && ( configUSE_STATS_FORMATTING_FUNCTIONS > 0 ) )
4489 void vTaskList( char * pcWriteBuffer )
4491 TaskStatus_t * pxTaskStatusArray;
4492 UBaseType_t uxArraySize, x;
4498 * This function is provided for convenience only, and is used by many
4499 * of the demo applications. Do not consider it to be part of the
4502 * vTaskList() calls uxTaskGetSystemState(), then formats part of the
4503 * uxTaskGetSystemState() output into a human readable table that
4504 * displays task: names, states, priority, stack usage and task number.
4505 * Stack usage specified as the number of unused StackType_t words stack can hold
4506 * on top of stack - not the number of bytes.
4508 * vTaskList() has a dependency on the sprintf() C library function that
4509 * might bloat the code size, use a lot of stack, and provide different
4510 * results on different platforms. An alternative, tiny, third party,
4511 * and limited functionality implementation of sprintf() is provided in
4512 * many of the FreeRTOS/Demo sub-directories in a file called
4513 * printf-stdarg.c (note printf-stdarg.c does not provide a full
4514 * snprintf() implementation!).
4516 * It is recommended that production systems call uxTaskGetSystemState()
4517 * directly to get access to raw stats data, rather than indirectly
4518 * through a call to vTaskList().
4522 /* Make sure the write buffer does not contain a string. */
4523 *pcWriteBuffer = ( char ) 0x00;
4525 /* Take a snapshot of the number of tasks in case it changes while this
4526 * function is executing. */
4527 uxArraySize = uxCurrentNumberOfTasks;
4529 /* Allocate an array index for each task. NOTE! if
4530 * configSUPPORT_DYNAMIC_ALLOCATION is set to 0 then pvPortMalloc() will
4531 * equate to NULL. */
4532 pxTaskStatusArray = pvPortMalloc( uxCurrentNumberOfTasks * sizeof( TaskStatus_t ) ); /*lint !e9079 All values returned by pvPortMalloc() have at least the alignment required by the MCU's stack and this allocation allocates a struct that has the alignment requirements of a pointer. */
4534 if( pxTaskStatusArray != NULL )
4536 /* Generate the (binary) data. */
4537 uxArraySize = uxTaskGetSystemState( pxTaskStatusArray, uxArraySize, NULL );
4539 /* Create a human readable table from the binary data. */
4540 for( x = 0; x < uxArraySize; x++ )
4542 switch( pxTaskStatusArray[ x ].eCurrentState )
4545 cStatus = tskRUNNING_CHAR;
4549 cStatus = tskREADY_CHAR;
4553 cStatus = tskBLOCKED_CHAR;
4557 cStatus = tskSUSPENDED_CHAR;
4561 cStatus = tskDELETED_CHAR;
4564 case eInvalid: /* Fall through. */
4565 default: /* Should not get here, but it is included
4566 * to prevent static checking errors. */
4567 cStatus = ( char ) 0x00;
4571 /* Write the task name to the string, padding with spaces so it
4572 * can be printed in tabular form more easily. */
4573 pcWriteBuffer = prvWriteNameToBuffer( pcWriteBuffer, pxTaskStatusArray[ x ].pcTaskName );
4575 /* Write the rest of the string. */
4576 sprintf( pcWriteBuffer, "\t%c\t%u\t%u\t%u\r\n", cStatus, ( unsigned int ) pxTaskStatusArray[ x ].uxCurrentPriority, ( unsigned int ) pxTaskStatusArray[ x ].usStackHighWaterMark, ( unsigned int ) pxTaskStatusArray[ x ].xTaskNumber ); /*lint !e586 sprintf() allowed as this is compiled with many compilers and this is a utility function only - not part of the core kernel implementation. */
4577 pcWriteBuffer += strlen( pcWriteBuffer ); /*lint !e9016 Pointer arithmetic ok on char pointers especially as in this case where it best denotes the intent of the code. */
4580 /* Free the array again. NOTE! If configSUPPORT_DYNAMIC_ALLOCATION
4581 * is 0 then vPortFree() will be #defined to nothing. */
4582 vPortFree( pxTaskStatusArray );
4586 mtCOVERAGE_TEST_MARKER();
4590 #endif /* ( ( configUSE_TRACE_FACILITY == 1 ) && ( configUSE_STATS_FORMATTING_FUNCTIONS > 0 ) ) */
4591 /*----------------------------------------------------------*/
4593 #if ( ( configGENERATE_RUN_TIME_STATS == 1 ) && ( configUSE_STATS_FORMATTING_FUNCTIONS > 0 ) && ( configUSE_TRACE_FACILITY == 1 ) )
4595 void vTaskGetRunTimeStats( char * pcWriteBuffer )
4597 TaskStatus_t * pxTaskStatusArray;
4598 UBaseType_t uxArraySize, x;
4599 configRUN_TIME_COUNTER_TYPE ulTotalTime, ulStatsAsPercentage;
4604 * This function is provided for convenience only, and is used by many
4605 * of the demo applications. Do not consider it to be part of the
4608 * vTaskGetRunTimeStats() calls uxTaskGetSystemState(), then formats part
4609 * of the uxTaskGetSystemState() output into a human readable table that
4610 * displays the amount of time each task has spent in the Running state
4611 * in both absolute and percentage terms.
4613 * vTaskGetRunTimeStats() has a dependency on the sprintf() C library
4614 * function that might bloat the code size, use a lot of stack, and
4615 * provide different results on different platforms. An alternative,
4616 * tiny, third party, and limited functionality implementation of
4617 * sprintf() is provided in many of the FreeRTOS/Demo sub-directories in
4618 * a file called printf-stdarg.c (note printf-stdarg.c does not provide
4619 * a full snprintf() implementation!).
4621 * It is recommended that production systems call uxTaskGetSystemState()
4622 * directly to get access to raw stats data, rather than indirectly
4623 * through a call to vTaskGetRunTimeStats().
4626 /* Make sure the write buffer does not contain a string. */
4627 *pcWriteBuffer = ( char ) 0x00;
4629 /* Take a snapshot of the number of tasks in case it changes while this
4630 * function is executing. */
4631 uxArraySize = uxCurrentNumberOfTasks;
4633 /* Allocate an array index for each task. NOTE! If
4634 * configSUPPORT_DYNAMIC_ALLOCATION is set to 0 then pvPortMalloc() will
4635 * equate to NULL. */
4636 pxTaskStatusArray = pvPortMalloc( uxCurrentNumberOfTasks * sizeof( TaskStatus_t ) ); /*lint !e9079 All values returned by pvPortMalloc() have at least the alignment required by the MCU's stack and this allocation allocates a struct that has the alignment requirements of a pointer. */
4638 if( pxTaskStatusArray != NULL )
4640 /* Generate the (binary) data. */
4641 uxArraySize = uxTaskGetSystemState( pxTaskStatusArray, uxArraySize, &ulTotalTime );
4643 /* For percentage calculations. */
4644 ulTotalTime /= 100UL;
4646 /* Avoid divide by zero errors. */
4647 if( ulTotalTime > 0UL )
4649 /* Create a human readable table from the binary data. */
4650 for( x = 0; x < uxArraySize; x++ )
4652 /* What percentage of the total run time has the task used?
4653 * This will always be rounded down to the nearest integer.
4654 * ulTotalRunTime has already been divided by 100. */
4655 ulStatsAsPercentage = pxTaskStatusArray[ x ].ulRunTimeCounter / ulTotalTime;
4657 /* Write the task name to the string, padding with
4658 * spaces so it can be printed in tabular form more
4660 pcWriteBuffer = prvWriteNameToBuffer( pcWriteBuffer, pxTaskStatusArray[ x ].pcTaskName );
4662 if( ulStatsAsPercentage > 0UL )
4664 #ifdef portLU_PRINTF_SPECIFIER_REQUIRED
4666 sprintf( pcWriteBuffer, "\t%lu\t\t%lu%%\r\n", pxTaskStatusArray[ x ].ulRunTimeCounter, ulStatsAsPercentage );
4670 /* sizeof( int ) == sizeof( long ) so a smaller
4671 * printf() library can be used. */
4672 sprintf( pcWriteBuffer, "\t%u\t\t%u%%\r\n", ( unsigned int ) pxTaskStatusArray[ x ].ulRunTimeCounter, ( unsigned int ) ulStatsAsPercentage ); /*lint !e586 sprintf() allowed as this is compiled with many compilers and this is a utility function only - not part of the core kernel implementation. */
4678 /* If the percentage is zero here then the task has
4679 * consumed less than 1% of the total run time. */
4680 #ifdef portLU_PRINTF_SPECIFIER_REQUIRED
4682 sprintf( pcWriteBuffer, "\t%lu\t\t<1%%\r\n", pxTaskStatusArray[ x ].ulRunTimeCounter );
4686 /* sizeof( int ) == sizeof( long ) so a smaller
4687 * printf() library can be used. */
4688 sprintf( pcWriteBuffer, "\t%u\t\t<1%%\r\n", ( unsigned int ) pxTaskStatusArray[ x ].ulRunTimeCounter ); /*lint !e586 sprintf() allowed as this is compiled with many compilers and this is a utility function only - not part of the core kernel implementation. */
4693 pcWriteBuffer += strlen( pcWriteBuffer ); /*lint !e9016 Pointer arithmetic ok on char pointers especially as in this case where it best denotes the intent of the code. */
4698 mtCOVERAGE_TEST_MARKER();
4701 /* Free the array again. NOTE! If configSUPPORT_DYNAMIC_ALLOCATION
4702 * is 0 then vPortFree() will be #defined to nothing. */
4703 vPortFree( pxTaskStatusArray );
4707 mtCOVERAGE_TEST_MARKER();
4711 #endif /* ( ( configGENERATE_RUN_TIME_STATS == 1 ) && ( configUSE_STATS_FORMATTING_FUNCTIONS > 0 ) ) */
4712 /*-----------------------------------------------------------*/
4714 TickType_t uxTaskResetEventItemValue( void )
4716 TickType_t uxReturn;
4718 uxReturn = listGET_LIST_ITEM_VALUE( &( pxCurrentTCB->xEventListItem ) );
4720 /* Reset the event list item to its normal value - so it can be used with
4721 * queues and semaphores. */
4722 listSET_LIST_ITEM_VALUE( &( pxCurrentTCB->xEventListItem ), ( ( TickType_t ) configMAX_PRIORITIES - ( TickType_t ) pxCurrentTCB->uxPriority ) ); /*lint !e961 MISRA exception as the casts are only redundant for some ports. */
4726 /*-----------------------------------------------------------*/
4728 #if ( configUSE_MUTEXES == 1 )
4730 TaskHandle_t pvTaskIncrementMutexHeldCount( void )
4732 /* If xSemaphoreCreateMutex() is called before any tasks have been created
4733 * then pxCurrentTCB will be NULL. */
4734 if( pxCurrentTCB != NULL )
4736 ( pxCurrentTCB->uxMutexesHeld )++;
4739 return pxCurrentTCB;
4742 #endif /* configUSE_MUTEXES */
4743 /*-----------------------------------------------------------*/
4745 #if ( configUSE_TASK_NOTIFICATIONS == 1 )
4747 uint32_t ulTaskGenericNotifyTake( UBaseType_t uxIndexToWait,
4748 BaseType_t xClearCountOnExit,
4749 TickType_t xTicksToWait )
4753 configASSERT( uxIndexToWait < configTASK_NOTIFICATION_ARRAY_ENTRIES );
4755 taskENTER_CRITICAL();
4757 /* Only block if the notification count is not already non-zero. */
4758 if( pxCurrentTCB->ulNotifiedValue[ uxIndexToWait ] == 0UL )
4760 /* Mark this task as waiting for a notification. */
4761 pxCurrentTCB->ucNotifyState[ uxIndexToWait ] = taskWAITING_NOTIFICATION;
4763 if( xTicksToWait > ( TickType_t ) 0 )
4765 prvAddCurrentTaskToDelayedList( xTicksToWait, pdTRUE );
4766 traceTASK_NOTIFY_TAKE_BLOCK( uxIndexToWait );
4768 /* All ports are written to allow a yield in a critical
4769 * section (some will yield immediately, others wait until the
4770 * critical section exits) - but it is not something that
4771 * application code should ever do. */
4772 portYIELD_WITHIN_API();
4776 mtCOVERAGE_TEST_MARKER();
4781 mtCOVERAGE_TEST_MARKER();
4784 taskEXIT_CRITICAL();
4786 taskENTER_CRITICAL();
4788 traceTASK_NOTIFY_TAKE( uxIndexToWait );
4789 ulReturn = pxCurrentTCB->ulNotifiedValue[ uxIndexToWait ];
4791 if( ulReturn != 0UL )
4793 if( xClearCountOnExit != pdFALSE )
4795 pxCurrentTCB->ulNotifiedValue[ uxIndexToWait ] = 0UL;
4799 pxCurrentTCB->ulNotifiedValue[ uxIndexToWait ] = ulReturn - ( uint32_t ) 1;
4804 mtCOVERAGE_TEST_MARKER();
4807 pxCurrentTCB->ucNotifyState[ uxIndexToWait ] = taskNOT_WAITING_NOTIFICATION;
4809 taskEXIT_CRITICAL();
4814 #endif /* configUSE_TASK_NOTIFICATIONS */
4815 /*-----------------------------------------------------------*/
4817 #if ( configUSE_TASK_NOTIFICATIONS == 1 )
4819 BaseType_t xTaskGenericNotifyWait( UBaseType_t uxIndexToWait,
4820 uint32_t ulBitsToClearOnEntry,
4821 uint32_t ulBitsToClearOnExit,
4822 uint32_t * pulNotificationValue,
4823 TickType_t xTicksToWait )
4827 configASSERT( uxIndexToWait < configTASK_NOTIFICATION_ARRAY_ENTRIES );
4829 taskENTER_CRITICAL();
4831 /* Only block if a notification is not already pending. */
4832 if( pxCurrentTCB->ucNotifyState[ uxIndexToWait ] != taskNOTIFICATION_RECEIVED )
4834 /* Clear bits in the task's notification value as bits may get
4835 * set by the notifying task or interrupt. This can be used to
4836 * clear the value to zero. */
4837 pxCurrentTCB->ulNotifiedValue[ uxIndexToWait ] &= ~ulBitsToClearOnEntry;
4839 /* Mark this task as waiting for a notification. */
4840 pxCurrentTCB->ucNotifyState[ uxIndexToWait ] = taskWAITING_NOTIFICATION;
4842 if( xTicksToWait > ( TickType_t ) 0 )
4844 prvAddCurrentTaskToDelayedList( xTicksToWait, pdTRUE );
4845 traceTASK_NOTIFY_WAIT_BLOCK( uxIndexToWait );
4847 /* All ports are written to allow a yield in a critical
4848 * section (some will yield immediately, others wait until the
4849 * critical section exits) - but it is not something that
4850 * application code should ever do. */
4851 portYIELD_WITHIN_API();
4855 mtCOVERAGE_TEST_MARKER();
4860 mtCOVERAGE_TEST_MARKER();
4863 taskEXIT_CRITICAL();
4865 taskENTER_CRITICAL();
4867 traceTASK_NOTIFY_WAIT( uxIndexToWait );
4869 if( pulNotificationValue != NULL )
4871 /* Output the current notification value, which may or may not
4873 *pulNotificationValue = pxCurrentTCB->ulNotifiedValue[ uxIndexToWait ];
4876 /* If ucNotifyValue is set then either the task never entered the
4877 * blocked state (because a notification was already pending) or the
4878 * task unblocked because of a notification. Otherwise the task
4879 * unblocked because of a timeout. */
4880 if( pxCurrentTCB->ucNotifyState[ uxIndexToWait ] != taskNOTIFICATION_RECEIVED )
4882 /* A notification was not received. */
4887 /* A notification was already pending or a notification was
4888 * received while the task was waiting. */
4889 pxCurrentTCB->ulNotifiedValue[ uxIndexToWait ] &= ~ulBitsToClearOnExit;
4893 pxCurrentTCB->ucNotifyState[ uxIndexToWait ] = taskNOT_WAITING_NOTIFICATION;
4895 taskEXIT_CRITICAL();
4900 #endif /* configUSE_TASK_NOTIFICATIONS */
4901 /*-----------------------------------------------------------*/
4903 #if ( configUSE_TASK_NOTIFICATIONS == 1 )
4905 BaseType_t xTaskGenericNotify( TaskHandle_t xTaskToNotify,
4906 UBaseType_t uxIndexToNotify,
4908 eNotifyAction eAction,
4909 uint32_t * pulPreviousNotificationValue )
4912 BaseType_t xReturn = pdPASS;
4913 uint8_t ucOriginalNotifyState;
4915 configASSERT( uxIndexToNotify < configTASK_NOTIFICATION_ARRAY_ENTRIES );
4916 configASSERT( xTaskToNotify );
4917 pxTCB = xTaskToNotify;
4919 taskENTER_CRITICAL();
4921 if( pulPreviousNotificationValue != NULL )
4923 *pulPreviousNotificationValue = pxTCB->ulNotifiedValue[ uxIndexToNotify ];
4926 ucOriginalNotifyState = pxTCB->ucNotifyState[ uxIndexToNotify ];
4928 pxTCB->ucNotifyState[ uxIndexToNotify ] = taskNOTIFICATION_RECEIVED;
4933 pxTCB->ulNotifiedValue[ uxIndexToNotify ] |= ulValue;
4937 ( pxTCB->ulNotifiedValue[ uxIndexToNotify ] )++;
4940 case eSetValueWithOverwrite:
4941 pxTCB->ulNotifiedValue[ uxIndexToNotify ] = ulValue;
4944 case eSetValueWithoutOverwrite:
4946 if( ucOriginalNotifyState != taskNOTIFICATION_RECEIVED )
4948 pxTCB->ulNotifiedValue[ uxIndexToNotify ] = ulValue;
4952 /* The value could not be written to the task. */
4960 /* The task is being notified without its notify value being
4966 /* Should not get here if all enums are handled.
4967 * Artificially force an assert by testing a value the
4968 * compiler can't assume is const. */
4969 configASSERT( xTickCount == ( TickType_t ) 0 );
4974 traceTASK_NOTIFY( uxIndexToNotify );
4976 /* If the task is in the blocked state specifically to wait for a
4977 * notification then unblock it now. */
4978 if( ucOriginalNotifyState == taskWAITING_NOTIFICATION )
4980 listREMOVE_ITEM( &( pxTCB->xStateListItem ) );
4981 prvAddTaskToReadyList( pxTCB );
4983 /* The task should not have been on an event list. */
4984 configASSERT( listLIST_ITEM_CONTAINER( &( pxTCB->xEventListItem ) ) == NULL );
4986 #if ( configUSE_TICKLESS_IDLE != 0 )
4988 /* If a task is blocked waiting for a notification then
4989 * xNextTaskUnblockTime might be set to the blocked task's time
4990 * out time. If the task is unblocked for a reason other than
4991 * a timeout xNextTaskUnblockTime is normally left unchanged,
4992 * because it will automatically get reset to a new value when
4993 * the tick count equals xNextTaskUnblockTime. However if
4994 * tickless idling is used it might be more important to enter
4995 * sleep mode at the earliest possible time - so reset
4996 * xNextTaskUnblockTime here to ensure it is updated at the
4997 * earliest possible time. */
4998 prvResetNextTaskUnblockTime();
5002 if( pxTCB->uxPriority > pxCurrentTCB->uxPriority )
5004 /* The notified task has a priority above the currently
5005 * executing task so a yield is required. */
5006 taskYIELD_IF_USING_PREEMPTION();
5010 mtCOVERAGE_TEST_MARKER();
5015 mtCOVERAGE_TEST_MARKER();
5018 taskEXIT_CRITICAL();
5023 #endif /* configUSE_TASK_NOTIFICATIONS */
5024 /*-----------------------------------------------------------*/
5026 #if ( configUSE_TASK_NOTIFICATIONS == 1 )
5028 BaseType_t xTaskGenericNotifyFromISR( TaskHandle_t xTaskToNotify,
5029 UBaseType_t uxIndexToNotify,
5031 eNotifyAction eAction,
5032 uint32_t * pulPreviousNotificationValue,
5033 BaseType_t * pxHigherPriorityTaskWoken )
5036 uint8_t ucOriginalNotifyState;
5037 BaseType_t xReturn = pdPASS;
5038 UBaseType_t uxSavedInterruptStatus;
5040 configASSERT( xTaskToNotify );
5041 configASSERT( uxIndexToNotify < configTASK_NOTIFICATION_ARRAY_ENTRIES );
5043 /* RTOS ports that support interrupt nesting have the concept of a
5044 * maximum system call (or maximum API call) interrupt priority.
5045 * Interrupts that are above the maximum system call priority are keep
5046 * permanently enabled, even when the RTOS kernel is in a critical section,
5047 * but cannot make any calls to FreeRTOS API functions. If configASSERT()
5048 * is defined in FreeRTOSConfig.h then
5049 * portASSERT_IF_INTERRUPT_PRIORITY_INVALID() will result in an assertion
5050 * failure if a FreeRTOS API function is called from an interrupt that has
5051 * been assigned a priority above the configured maximum system call
5052 * priority. Only FreeRTOS functions that end in FromISR can be called
5053 * from interrupts that have been assigned a priority at or (logically)
5054 * below the maximum system call interrupt priority. FreeRTOS maintains a
5055 * separate interrupt safe API to ensure interrupt entry is as fast and as
5056 * simple as possible. More information (albeit Cortex-M specific) is
5057 * provided on the following link:
5058 * https://www.FreeRTOS.org/RTOS-Cortex-M3-M4.html */
5059 portASSERT_IF_INTERRUPT_PRIORITY_INVALID();
5061 pxTCB = xTaskToNotify;
5063 uxSavedInterruptStatus = portSET_INTERRUPT_MASK_FROM_ISR();
5065 if( pulPreviousNotificationValue != NULL )
5067 *pulPreviousNotificationValue = pxTCB->ulNotifiedValue[ uxIndexToNotify ];
5070 ucOriginalNotifyState = pxTCB->ucNotifyState[ uxIndexToNotify ];
5071 pxTCB->ucNotifyState[ uxIndexToNotify ] = taskNOTIFICATION_RECEIVED;
5076 pxTCB->ulNotifiedValue[ uxIndexToNotify ] |= ulValue;
5080 ( pxTCB->ulNotifiedValue[ uxIndexToNotify ] )++;
5083 case eSetValueWithOverwrite:
5084 pxTCB->ulNotifiedValue[ uxIndexToNotify ] = ulValue;
5087 case eSetValueWithoutOverwrite:
5089 if( ucOriginalNotifyState != taskNOTIFICATION_RECEIVED )
5091 pxTCB->ulNotifiedValue[ uxIndexToNotify ] = ulValue;
5095 /* The value could not be written to the task. */
5103 /* The task is being notified without its notify value being
5109 /* Should not get here if all enums are handled.
5110 * Artificially force an assert by testing a value the
5111 * compiler can't assume is const. */
5112 configASSERT( xTickCount == ( TickType_t ) 0 );
5116 traceTASK_NOTIFY_FROM_ISR( uxIndexToNotify );
5118 /* If the task is in the blocked state specifically to wait for a
5119 * notification then unblock it now. */
5120 if( ucOriginalNotifyState == taskWAITING_NOTIFICATION )
5122 /* The task should not have been on an event list. */
5123 configASSERT( listLIST_ITEM_CONTAINER( &( pxTCB->xEventListItem ) ) == NULL );
5125 if( uxSchedulerSuspended == ( UBaseType_t ) 0U )
5127 listREMOVE_ITEM( &( pxTCB->xStateListItem ) );
5128 prvAddTaskToReadyList( pxTCB );
5132 /* The delayed and ready lists cannot be accessed, so hold
5133 * this task pending until the scheduler is resumed. */
5134 listINSERT_END( &( xPendingReadyList ), &( pxTCB->xEventListItem ) );
5137 if( pxTCB->uxPriority > pxCurrentTCB->uxPriority )
5139 /* The notified task has a priority above the currently
5140 * executing task so a yield is required. */
5141 if( pxHigherPriorityTaskWoken != NULL )
5143 *pxHigherPriorityTaskWoken = pdTRUE;
5146 /* Mark that a yield is pending in case the user is not
5147 * using the "xHigherPriorityTaskWoken" parameter to an ISR
5148 * safe FreeRTOS function. */
5149 xYieldPending = pdTRUE;
5153 mtCOVERAGE_TEST_MARKER();
5157 portCLEAR_INTERRUPT_MASK_FROM_ISR( uxSavedInterruptStatus );
5162 #endif /* configUSE_TASK_NOTIFICATIONS */
5163 /*-----------------------------------------------------------*/
5165 #if ( configUSE_TASK_NOTIFICATIONS == 1 )
5167 void vTaskGenericNotifyGiveFromISR( TaskHandle_t xTaskToNotify,
5168 UBaseType_t uxIndexToNotify,
5169 BaseType_t * pxHigherPriorityTaskWoken )
5172 uint8_t ucOriginalNotifyState;
5173 UBaseType_t uxSavedInterruptStatus;
5175 configASSERT( xTaskToNotify );
5176 configASSERT( uxIndexToNotify < configTASK_NOTIFICATION_ARRAY_ENTRIES );
5178 /* RTOS ports that support interrupt nesting have the concept of a
5179 * maximum system call (or maximum API call) interrupt priority.
5180 * Interrupts that are above the maximum system call priority are keep
5181 * permanently enabled, even when the RTOS kernel is in a critical section,
5182 * but cannot make any calls to FreeRTOS API functions. If configASSERT()
5183 * is defined in FreeRTOSConfig.h then
5184 * portASSERT_IF_INTERRUPT_PRIORITY_INVALID() will result in an assertion
5185 * failure if a FreeRTOS API function is called from an interrupt that has
5186 * been assigned a priority above the configured maximum system call
5187 * priority. Only FreeRTOS functions that end in FromISR can be called
5188 * from interrupts that have been assigned a priority at or (logically)
5189 * below the maximum system call interrupt priority. FreeRTOS maintains a
5190 * separate interrupt safe API to ensure interrupt entry is as fast and as
5191 * simple as possible. More information (albeit Cortex-M specific) is
5192 * provided on the following link:
5193 * https://www.FreeRTOS.org/RTOS-Cortex-M3-M4.html */
5194 portASSERT_IF_INTERRUPT_PRIORITY_INVALID();
5196 pxTCB = xTaskToNotify;
5198 uxSavedInterruptStatus = portSET_INTERRUPT_MASK_FROM_ISR();
5200 ucOriginalNotifyState = pxTCB->ucNotifyState[ uxIndexToNotify ];
5201 pxTCB->ucNotifyState[ uxIndexToNotify ] = taskNOTIFICATION_RECEIVED;
5203 /* 'Giving' is equivalent to incrementing a count in a counting
5205 ( pxTCB->ulNotifiedValue[ uxIndexToNotify ] )++;
5207 traceTASK_NOTIFY_GIVE_FROM_ISR( uxIndexToNotify );
5209 /* If the task is in the blocked state specifically to wait for a
5210 * notification then unblock it now. */
5211 if( ucOriginalNotifyState == taskWAITING_NOTIFICATION )
5213 /* The task should not have been on an event list. */
5214 configASSERT( listLIST_ITEM_CONTAINER( &( pxTCB->xEventListItem ) ) == NULL );
5216 if( uxSchedulerSuspended == ( UBaseType_t ) 0U )
5218 listREMOVE_ITEM( &( pxTCB->xStateListItem ) );
5219 prvAddTaskToReadyList( pxTCB );
5223 /* The delayed and ready lists cannot be accessed, so hold
5224 * this task pending until the scheduler is resumed. */
5225 listINSERT_END( &( xPendingReadyList ), &( pxTCB->xEventListItem ) );
5228 if( pxTCB->uxPriority > pxCurrentTCB->uxPriority )
5230 /* The notified task has a priority above the currently
5231 * executing task so a yield is required. */
5232 if( pxHigherPriorityTaskWoken != NULL )
5234 *pxHigherPriorityTaskWoken = pdTRUE;
5237 /* Mark that a yield is pending in case the user is not
5238 * using the "xHigherPriorityTaskWoken" parameter in an ISR
5239 * safe FreeRTOS function. */
5240 xYieldPending = pdTRUE;
5244 mtCOVERAGE_TEST_MARKER();
5248 portCLEAR_INTERRUPT_MASK_FROM_ISR( uxSavedInterruptStatus );
5251 #endif /* configUSE_TASK_NOTIFICATIONS */
5252 /*-----------------------------------------------------------*/
5254 #if ( configUSE_TASK_NOTIFICATIONS == 1 )
5256 BaseType_t xTaskGenericNotifyStateClear( TaskHandle_t xTask,
5257 UBaseType_t uxIndexToClear )
5262 configASSERT( uxIndexToClear < configTASK_NOTIFICATION_ARRAY_ENTRIES );
5264 /* If null is passed in here then it is the calling task that is having
5265 * its notification state cleared. */
5266 pxTCB = prvGetTCBFromHandle( xTask );
5268 taskENTER_CRITICAL();
5270 if( pxTCB->ucNotifyState[ uxIndexToClear ] == taskNOTIFICATION_RECEIVED )
5272 pxTCB->ucNotifyState[ uxIndexToClear ] = taskNOT_WAITING_NOTIFICATION;
5280 taskEXIT_CRITICAL();
5285 #endif /* configUSE_TASK_NOTIFICATIONS */
5286 /*-----------------------------------------------------------*/
5288 #if ( configUSE_TASK_NOTIFICATIONS == 1 )
5290 uint32_t ulTaskGenericNotifyValueClear( TaskHandle_t xTask,
5291 UBaseType_t uxIndexToClear,
5292 uint32_t ulBitsToClear )
5297 /* If null is passed in here then it is the calling task that is having
5298 * its notification state cleared. */
5299 pxTCB = prvGetTCBFromHandle( xTask );
5301 taskENTER_CRITICAL();
5303 /* Return the notification as it was before the bits were cleared,
5304 * then clear the bit mask. */
5305 ulReturn = pxTCB->ulNotifiedValue[ uxIndexToClear ];
5306 pxTCB->ulNotifiedValue[ uxIndexToClear ] &= ~ulBitsToClear;
5308 taskEXIT_CRITICAL();
5313 #endif /* configUSE_TASK_NOTIFICATIONS */
5314 /*-----------------------------------------------------------*/
5316 #if ( configGENERATE_RUN_TIME_STATS == 1 )
5318 configRUN_TIME_COUNTER_TYPE ulTaskGetRunTimeCounter( const TaskHandle_t xTask )
5320 return xTask->ulRunTimeCounter;
5324 /*-----------------------------------------------------------*/
5326 #if ( configGENERATE_RUN_TIME_STATS == 1 )
5328 configRUN_TIME_COUNTER_TYPE ulTaskGetRunTimePercent( const TaskHandle_t xTask )
5330 configRUN_TIME_COUNTER_TYPE ulTotalTime, ulReturn;
5332 ulTotalTime = ( configRUN_TIME_COUNTER_TYPE ) portGET_RUN_TIME_COUNTER_VALUE();
5334 /* For percentage calculations. */
5335 ulTotalTime /= ( configRUN_TIME_COUNTER_TYPE ) 100;
5337 /* Avoid divide by zero errors. */
5338 if( ulTotalTime > ( configRUN_TIME_COUNTER_TYPE ) 0 )
5340 ulReturn = xTask->ulRunTimeCounter / ulTotalTime;
5350 #endif /* if ( configGENERATE_RUN_TIME_STATS == 1 ) */
5351 /*-----------------------------------------------------------*/
5353 #if ( configGENERATE_RUN_TIME_STATS == 1 )
5355 configRUN_TIME_COUNTER_TYPE ulTaskGetIdleRunTimeCounter( void )
5357 return ulTaskGetRunTimeCounter( xIdleTaskHandle );
5361 /*-----------------------------------------------------------*/
5363 #if ( configGENERATE_RUN_TIME_STATS == 1 )
5365 configRUN_TIME_COUNTER_TYPE ulTaskGetIdleRunTimePercent( void )
5367 return ulTaskGetRunTimePercent( xIdleTaskHandle );
5371 /*-----------------------------------------------------------*/
5373 static void prvAddCurrentTaskToDelayedList( TickType_t xTicksToWait,
5374 const BaseType_t xCanBlockIndefinitely )
5376 TickType_t xTimeToWake;
5377 const TickType_t xConstTickCount = xTickCount;
5379 #if ( INCLUDE_xTaskAbortDelay == 1 )
5381 /* About to enter a delayed list, so ensure the ucDelayAborted flag is
5382 * reset to pdFALSE so it can be detected as having been set to pdTRUE
5383 * when the task leaves the Blocked state. */
5384 pxCurrentTCB->ucDelayAborted = pdFALSE;
5388 /* Remove the task from the ready list before adding it to the blocked list
5389 * as the same list item is used for both lists. */
5390 if( uxListRemove( &( pxCurrentTCB->xStateListItem ) ) == ( UBaseType_t ) 0 )
5392 /* The current task must be in a ready list, so there is no need to
5393 * check, and the port reset macro can be called directly. */
5394 portRESET_READY_PRIORITY( pxCurrentTCB->uxPriority, uxTopReadyPriority ); /*lint !e931 pxCurrentTCB cannot change as it is the calling task. pxCurrentTCB->uxPriority and uxTopReadyPriority cannot change as called with scheduler suspended or in a critical section. */
5398 mtCOVERAGE_TEST_MARKER();
5401 #if ( INCLUDE_vTaskSuspend == 1 )
5403 if( ( xTicksToWait == portMAX_DELAY ) && ( xCanBlockIndefinitely != pdFALSE ) )
5405 /* Add the task to the suspended task list instead of a delayed task
5406 * list to ensure it is not woken by a timing event. It will block
5408 listINSERT_END( &xSuspendedTaskList, &( pxCurrentTCB->xStateListItem ) );
5412 /* Calculate the time at which the task should be woken if the event
5413 * does not occur. This may overflow but this doesn't matter, the
5414 * kernel will manage it correctly. */
5415 xTimeToWake = xConstTickCount + xTicksToWait;
5417 /* The list item will be inserted in wake time order. */
5418 listSET_LIST_ITEM_VALUE( &( pxCurrentTCB->xStateListItem ), xTimeToWake );
5420 if( xTimeToWake < xConstTickCount )
5422 /* Wake time has overflowed. Place this item in the overflow
5424 vListInsert( pxOverflowDelayedTaskList, &( pxCurrentTCB->xStateListItem ) );
5428 /* The wake time has not overflowed, so the current block list
5430 vListInsert( pxDelayedTaskList, &( pxCurrentTCB->xStateListItem ) );
5432 /* If the task entering the blocked state was placed at the
5433 * head of the list of blocked tasks then xNextTaskUnblockTime
5434 * needs to be updated too. */
5435 if( xTimeToWake < xNextTaskUnblockTime )
5437 xNextTaskUnblockTime = xTimeToWake;
5441 mtCOVERAGE_TEST_MARKER();
5446 #else /* INCLUDE_vTaskSuspend */
5448 /* Calculate the time at which the task should be woken if the event
5449 * does not occur. This may overflow but this doesn't matter, the kernel
5450 * will manage it correctly. */
5451 xTimeToWake = xConstTickCount + xTicksToWait;
5453 /* The list item will be inserted in wake time order. */
5454 listSET_LIST_ITEM_VALUE( &( pxCurrentTCB->xStateListItem ), xTimeToWake );
5456 if( xTimeToWake < xConstTickCount )
5458 /* Wake time has overflowed. Place this item in the overflow list. */
5459 vListInsert( pxOverflowDelayedTaskList, &( pxCurrentTCB->xStateListItem ) );
5463 /* The wake time has not overflowed, so the current block list is used. */
5464 vListInsert( pxDelayedTaskList, &( pxCurrentTCB->xStateListItem ) );
5466 /* If the task entering the blocked state was placed at the head of the
5467 * list of blocked tasks then xNextTaskUnblockTime needs to be updated
5469 if( xTimeToWake < xNextTaskUnblockTime )
5471 xNextTaskUnblockTime = xTimeToWake;
5475 mtCOVERAGE_TEST_MARKER();
5479 /* Avoid compiler warning when INCLUDE_vTaskSuspend is not 1. */
5480 ( void ) xCanBlockIndefinitely;
5482 #endif /* INCLUDE_vTaskSuspend */
5485 /* Code below here allows additional code to be inserted into this source file,
5486 * especially where access to file scope functions and data is needed (for example
5487 * when performing module tests). */
5489 #ifdef FREERTOS_MODULE_TEST
5490 #include "tasks_test_access_functions.h"
5494 #if ( configINCLUDE_FREERTOS_TASK_C_ADDITIONS_H == 1 )
5496 #include "freertos_tasks_c_additions.h"
5498 #ifdef FREERTOS_TASKS_C_ADDITIONS_INIT
5499 static void freertos_tasks_c_additions_init( void )
5501 FREERTOS_TASKS_C_ADDITIONS_INIT();
5505 #endif /* if ( configINCLUDE_FREERTOS_TASK_C_ADDITIONS_H == 1 ) */