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 } /* 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 } /* 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 ] ) ); \
180 } /* taskSELECT_HIGHEST_PRIORITY_TASK() */
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 ) \
222 traceMOVED_TASK_TO_READY_STATE( pxTCB ); \
223 taskRECORD_READY_PRIORITY( ( pxTCB )->uxPriority ); \
224 listINSERT_END( &( pxReadyTasksLists[ ( pxTCB )->uxPriority ] ), &( ( pxTCB )->xStateListItem ) ); \
225 tracePOST_MOVED_TASK_TO_READY_STATE( pxTCB )
226 /*-----------------------------------------------------------*/
229 * Several functions take a TaskHandle_t parameter that can optionally be NULL,
230 * where NULL is used to indicate that the handle of the currently executing
231 * task should be used in place of the parameter. This macro simply checks to
232 * see if the parameter is NULL and returns a pointer to the appropriate TCB.
234 #define prvGetTCBFromHandle( pxHandle ) ( ( ( pxHandle ) == NULL ) ? pxCurrentTCB : ( pxHandle ) )
236 /* The item value of the event list item is normally used to hold the priority
237 * of the task to which it belongs (coded to allow it to be held in reverse
238 * priority order). However, it is occasionally borrowed for other purposes. It
239 * is important its value is not updated due to a task priority change while it is
240 * being used for another purpose. The following bit definition is used to inform
241 * the scheduler that the value should not be changed - in which case it is the
242 * responsibility of whichever module is using the value to ensure it gets set back
243 * to its original value when it is released. */
244 #if ( configUSE_16_BIT_TICKS == 1 )
245 #define taskEVENT_LIST_ITEM_VALUE_IN_USE 0x8000U
247 #define taskEVENT_LIST_ITEM_VALUE_IN_USE 0x80000000UL
251 * Task control block. A task control block (TCB) is allocated for each task,
252 * and stores task state information, including a pointer to the task's context
253 * (the task's run time environment, including register values)
255 typedef struct tskTaskControlBlock /* The old naming convention is used to prevent breaking kernel aware debuggers. */
257 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. */
259 #if ( portUSING_MPU_WRAPPERS == 1 )
260 xMPU_SETTINGS xMPUSettings; /*< The MPU settings are defined as part of the port layer. THIS MUST BE THE SECOND MEMBER OF THE TCB STRUCT. */
263 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 ). */
264 ListItem_t xEventListItem; /*< Used to reference a task from an event list. */
265 UBaseType_t uxPriority; /*< The priority of the task. 0 is the lowest priority. */
266 StackType_t * pxStack; /*< Points to the start of the stack. */
267 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. */
269 #if ( ( portSTACK_GROWTH > 0 ) || ( configRECORD_STACK_HIGH_ADDRESS == 1 ) )
270 StackType_t * pxEndOfStack; /*< Points to the highest valid address for the stack. */
273 #if ( portCRITICAL_NESTING_IN_TCB == 1 )
274 UBaseType_t uxCriticalNesting; /*< Holds the critical section nesting depth for ports that do not maintain their own count in the port layer. */
277 #if ( configUSE_TRACE_FACILITY == 1 )
278 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. */
279 UBaseType_t uxTaskNumber; /*< Stores a number specifically for use by third party trace code. */
282 #if ( configUSE_MUTEXES == 1 )
283 UBaseType_t uxBasePriority; /*< The priority last assigned to the task - used by the priority inheritance mechanism. */
284 UBaseType_t uxMutexesHeld;
287 #if ( configUSE_APPLICATION_TASK_TAG == 1 )
288 TaskHookFunction_t pxTaskTag;
291 #if ( configNUM_THREAD_LOCAL_STORAGE_POINTERS > 0 )
292 void * pvThreadLocalStoragePointers[ configNUM_THREAD_LOCAL_STORAGE_POINTERS ];
295 #if ( configGENERATE_RUN_TIME_STATS == 1 )
296 configRUN_TIME_COUNTER_TYPE ulRunTimeCounter; /*< Stores the amount of time the task has spent in the Running state. */
299 #if ( ( configUSE_NEWLIB_REENTRANT == 1 ) || ( configUSE_C_RUNTIME_TLS_SUPPORT == 1 ) )
300 configTLS_BLOCK_TYPE xTLSBlock; /*< Memory block used as Thread Local Storage (TLS) Block for the task. */
303 #if ( configUSE_TASK_NOTIFICATIONS == 1 )
304 volatile uint32_t ulNotifiedValue[ configTASK_NOTIFICATION_ARRAY_ENTRIES ];
305 volatile uint8_t ucNotifyState[ configTASK_NOTIFICATION_ARRAY_ENTRIES ];
308 /* See the comments in FreeRTOS.h with the definition of
309 * tskSTATIC_AND_DYNAMIC_ALLOCATION_POSSIBLE. */
310 #if ( tskSTATIC_AND_DYNAMIC_ALLOCATION_POSSIBLE != 0 ) /*lint !e731 !e9029 Macro has been consolidated for readability reasons. */
311 uint8_t ucStaticallyAllocated; /*< Set to pdTRUE if the task is a statically allocated to ensure no attempt is made to free the memory. */
314 #if ( INCLUDE_xTaskAbortDelay == 1 )
315 uint8_t ucDelayAborted;
318 #if ( configUSE_POSIX_ERRNO == 1 )
323 /* The old tskTCB name is maintained above then typedefed to the new TCB_t name
324 * below to enable the use of older kernel aware debuggers. */
325 typedef tskTCB TCB_t;
327 /*lint -save -e956 A manual analysis and inspection has been used to determine
328 * which static variables must be declared volatile. */
329 portDONT_DISCARD PRIVILEGED_DATA TCB_t * volatile pxCurrentTCB = NULL;
331 /* Lists for ready and blocked tasks. --------------------
332 * xDelayedTaskList1 and xDelayedTaskList2 could be moved to function scope but
333 * doing so breaks some kernel aware debuggers and debuggers that rely on removing
334 * the static qualifier. */
335 PRIVILEGED_DATA static List_t pxReadyTasksLists[ configMAX_PRIORITIES ]; /*< Prioritised ready tasks. */
336 PRIVILEGED_DATA static List_t xDelayedTaskList1; /*< Delayed tasks. */
337 PRIVILEGED_DATA static List_t xDelayedTaskList2; /*< Delayed tasks (two lists are used - one for delays that have overflowed the current tick count. */
338 PRIVILEGED_DATA static List_t * volatile pxDelayedTaskList; /*< Points to the delayed task list currently being used. */
339 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. */
340 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. */
342 #if ( INCLUDE_vTaskDelete == 1 )
344 PRIVILEGED_DATA static List_t xTasksWaitingTermination; /*< Tasks that have been deleted - but their memory not yet freed. */
345 PRIVILEGED_DATA static volatile UBaseType_t uxDeletedTasksWaitingCleanUp = ( UBaseType_t ) 0U;
349 #if ( INCLUDE_vTaskSuspend == 1 )
351 PRIVILEGED_DATA static List_t xSuspendedTaskList; /*< Tasks that are currently suspended. */
355 /* Global POSIX errno. Its value is changed upon context switching to match
356 * the errno of the currently running task. */
357 #if ( configUSE_POSIX_ERRNO == 1 )
358 int FreeRTOS_errno = 0;
361 /* Other file private variables. --------------------------------*/
362 PRIVILEGED_DATA static volatile UBaseType_t uxCurrentNumberOfTasks = ( UBaseType_t ) 0U;
363 PRIVILEGED_DATA static volatile TickType_t xTickCount = ( TickType_t ) configINITIAL_TICK_COUNT;
364 PRIVILEGED_DATA static volatile UBaseType_t uxTopReadyPriority = tskIDLE_PRIORITY;
365 PRIVILEGED_DATA static volatile BaseType_t xSchedulerRunning = pdFALSE;
366 PRIVILEGED_DATA static volatile TickType_t xPendedTicks = ( TickType_t ) 0U;
367 PRIVILEGED_DATA static volatile BaseType_t xYieldPending = pdFALSE;
368 PRIVILEGED_DATA static volatile BaseType_t xNumOfOverflows = ( BaseType_t ) 0;
369 PRIVILEGED_DATA static UBaseType_t uxTaskNumber = ( UBaseType_t ) 0U;
370 PRIVILEGED_DATA static volatile TickType_t xNextTaskUnblockTime = ( TickType_t ) 0U; /* Initialised to portMAX_DELAY before the scheduler starts. */
371 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. */
373 /* Improve support for OpenOCD. The kernel tracks Ready tasks via priority lists.
374 * For tracking the state of remote threads, OpenOCD uses uxTopUsedPriority
375 * to determine the number of priority lists to read back from the remote target. */
376 const volatile UBaseType_t uxTopUsedPriority = configMAX_PRIORITIES - 1U;
378 /* Context switches are held pending while the scheduler is suspended. Also,
379 * interrupts must not manipulate the xStateListItem of a TCB, or any of the
380 * lists the xStateListItem can be referenced from, if the scheduler is suspended.
381 * If an interrupt needs to unblock a task while the scheduler is suspended then it
382 * moves the task's event list item into the xPendingReadyList, ready for the
383 * kernel to move the task from the pending ready list into the real ready list
384 * when the scheduler is unsuspended. The pending ready list itself can only be
385 * accessed from a critical section. */
386 PRIVILEGED_DATA static volatile UBaseType_t uxSchedulerSuspended = ( UBaseType_t ) pdFALSE;
388 #if ( configGENERATE_RUN_TIME_STATS == 1 )
390 /* Do not move these variables to function scope as doing so prevents the
391 * code working with debuggers that need to remove the static qualifier. */
392 PRIVILEGED_DATA static configRUN_TIME_COUNTER_TYPE ulTaskSwitchedInTime = 0UL; /*< Holds the value of a timer/counter the last time a task was switched in. */
393 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. */
399 /*-----------------------------------------------------------*/
401 /* File private functions. --------------------------------*/
404 * Utility task that simply returns pdTRUE if the task referenced by xTask is
405 * currently in the Suspended state, or pdFALSE if the task referenced by xTask
406 * is in any other state.
408 #if ( INCLUDE_vTaskSuspend == 1 )
410 static BaseType_t prvTaskIsTaskSuspended( const TaskHandle_t xTask ) PRIVILEGED_FUNCTION;
412 #endif /* INCLUDE_vTaskSuspend */
415 * Utility to ready all the lists used by the scheduler. This is called
416 * automatically upon the creation of the first task.
418 static void prvInitialiseTaskLists( void ) PRIVILEGED_FUNCTION;
421 * The idle task, which as all tasks is implemented as a never ending loop.
422 * The idle task is automatically created and added to the ready lists upon
423 * creation of the first user task.
425 * The portTASK_FUNCTION_PROTO() macro is used to allow port/compiler specific
426 * language extensions. The equivalent prototype for this function is:
428 * void prvIdleTask( void *pvParameters );
431 static portTASK_FUNCTION_PROTO( prvIdleTask, pvParameters ) PRIVILEGED_FUNCTION;
434 * Utility to free all memory allocated by the scheduler to hold a TCB,
435 * including the stack pointed to by the TCB.
437 * This does not free memory allocated by the task itself (i.e. memory
438 * allocated by calls to pvPortMalloc from within the tasks application code).
440 #if ( INCLUDE_vTaskDelete == 1 )
442 static void prvDeleteTCB( TCB_t * pxTCB ) PRIVILEGED_FUNCTION;
447 * Used only by the idle task. This checks to see if anything has been placed
448 * in the list of tasks waiting to be deleted. If so the task is cleaned up
449 * and its TCB deleted.
451 static void prvCheckTasksWaitingTermination( void ) PRIVILEGED_FUNCTION;
454 * The currently executing task is entering the Blocked state. Add the task to
455 * either the current or the overflow delayed task list.
457 static void prvAddCurrentTaskToDelayedList( TickType_t xTicksToWait,
458 const BaseType_t xCanBlockIndefinitely ) PRIVILEGED_FUNCTION;
461 * Fills an TaskStatus_t structure with information on each task that is
462 * referenced from the pxList list (which may be a ready list, a delayed list,
463 * a suspended list, etc.).
465 * THIS FUNCTION IS INTENDED FOR DEBUGGING ONLY, AND SHOULD NOT BE CALLED FROM
466 * NORMAL APPLICATION CODE.
468 #if ( configUSE_TRACE_FACILITY == 1 )
470 static UBaseType_t prvListTasksWithinSingleList( TaskStatus_t * pxTaskStatusArray,
472 eTaskState eState ) PRIVILEGED_FUNCTION;
477 * Searches pxList for a task with name pcNameToQuery - returning a handle to
478 * the task if it is found, or NULL if the task is not found.
480 #if ( INCLUDE_xTaskGetHandle == 1 )
482 static TCB_t * prvSearchForNameWithinSingleList( List_t * pxList,
483 const char pcNameToQuery[] ) PRIVILEGED_FUNCTION;
488 * When a task is created, the stack of the task is filled with a known value.
489 * This function determines the 'high water mark' of the task stack by
490 * determining how much of the stack remains at the original preset value.
492 #if ( ( configUSE_TRACE_FACILITY == 1 ) || ( INCLUDE_uxTaskGetStackHighWaterMark == 1 ) || ( INCLUDE_uxTaskGetStackHighWaterMark2 == 1 ) )
494 static configSTACK_DEPTH_TYPE prvTaskCheckFreeStackSpace( const uint8_t * pucStackByte ) PRIVILEGED_FUNCTION;
499 * Return the amount of time, in ticks, that will pass before the kernel will
500 * next move a task from the Blocked state to the Running state.
502 * This conditional compilation should use inequality to 0, not equality to 1.
503 * This is to ensure portSUPPRESS_TICKS_AND_SLEEP() can be called when user
504 * defined low power mode implementations require configUSE_TICKLESS_IDLE to be
505 * set to a value other than 1.
507 #if ( configUSE_TICKLESS_IDLE != 0 )
509 static TickType_t prvGetExpectedIdleTime( void ) PRIVILEGED_FUNCTION;
514 * Set xNextTaskUnblockTime to the time at which the next Blocked state task
515 * will exit the Blocked state.
517 static void prvResetNextTaskUnblockTime( void ) PRIVILEGED_FUNCTION;
519 #if ( configUSE_STATS_FORMATTING_FUNCTIONS > 0 )
522 * Helper function used to pad task names with spaces when printing out
523 * human readable tables of task information.
525 static char * prvWriteNameToBuffer( char * pcBuffer,
526 const char * pcTaskName ) PRIVILEGED_FUNCTION;
531 * Called after a Task_t structure has been allocated either statically or
532 * dynamically to fill in the structure's members.
534 static void prvInitialiseNewTask( TaskFunction_t pxTaskCode,
535 const char * const pcName, /*lint !e971 Unqualified char types are allowed for strings and single characters only. */
536 const uint32_t ulStackDepth,
537 void * const pvParameters,
538 UBaseType_t uxPriority,
539 TaskHandle_t * const pxCreatedTask,
541 const MemoryRegion_t * const xRegions ) PRIVILEGED_FUNCTION;
544 * Called after a new task has been created and initialised to place the task
545 * under the control of the scheduler.
547 static void prvAddNewTaskToReadyList( TCB_t * pxNewTCB ) PRIVILEGED_FUNCTION;
550 * freertos_tasks_c_additions_init() should only be called if the user definable
551 * macro FREERTOS_TASKS_C_ADDITIONS_INIT() is defined, as that is the only macro
552 * called by the function.
554 #ifdef FREERTOS_TASKS_C_ADDITIONS_INIT
556 static void freertos_tasks_c_additions_init( void ) PRIVILEGED_FUNCTION;
560 /*-----------------------------------------------------------*/
562 #if ( configSUPPORT_STATIC_ALLOCATION == 1 )
564 TaskHandle_t xTaskCreateStatic( TaskFunction_t pxTaskCode,
565 const char * const pcName, /*lint !e971 Unqualified char types are allowed for strings and single characters only. */
566 const uint32_t ulStackDepth,
567 void * const pvParameters,
568 UBaseType_t uxPriority,
569 StackType_t * const puxStackBuffer,
570 StaticTask_t * const pxTaskBuffer )
573 TaskHandle_t xReturn;
575 configASSERT( puxStackBuffer != NULL );
576 configASSERT( pxTaskBuffer != NULL );
578 #if ( configASSERT_DEFINED == 1 )
580 /* Sanity check that the size of the structure used to declare a
581 * variable of type StaticTask_t equals the size of the real task
583 volatile size_t xSize = sizeof( StaticTask_t );
584 configASSERT( xSize == sizeof( TCB_t ) );
585 ( void ) xSize; /* Prevent lint warning when configASSERT() is not used. */
587 #endif /* configASSERT_DEFINED */
589 if( ( pxTaskBuffer != NULL ) && ( puxStackBuffer != NULL ) )
591 /* The memory used for the task's TCB and stack are passed into this
592 * function - use them. */
593 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. */
594 memset( ( void * ) pxNewTCB, 0x00, sizeof( TCB_t ) );
595 pxNewTCB->pxStack = ( StackType_t * ) puxStackBuffer;
597 #if ( tskSTATIC_AND_DYNAMIC_ALLOCATION_POSSIBLE != 0 ) /*lint !e731 !e9029 Macro has been consolidated for readability reasons. */
599 /* Tasks can be created statically or dynamically, so note this
600 * task was created statically in case the task is later deleted. */
601 pxNewTCB->ucStaticallyAllocated = tskSTATICALLY_ALLOCATED_STACK_AND_TCB;
603 #endif /* tskSTATIC_AND_DYNAMIC_ALLOCATION_POSSIBLE */
605 prvInitialiseNewTask( pxTaskCode, pcName, ulStackDepth, pvParameters, uxPriority, &xReturn, pxNewTCB, NULL );
606 prvAddNewTaskToReadyList( pxNewTCB );
616 #endif /* SUPPORT_STATIC_ALLOCATION */
617 /*-----------------------------------------------------------*/
619 #if ( ( portUSING_MPU_WRAPPERS == 1 ) && ( configSUPPORT_STATIC_ALLOCATION == 1 ) )
621 BaseType_t xTaskCreateRestrictedStatic( const TaskParameters_t * const pxTaskDefinition,
622 TaskHandle_t * pxCreatedTask )
625 BaseType_t xReturn = errCOULD_NOT_ALLOCATE_REQUIRED_MEMORY;
627 configASSERT( pxTaskDefinition->puxStackBuffer != NULL );
628 configASSERT( pxTaskDefinition->pxTaskBuffer != NULL );
630 if( ( pxTaskDefinition->puxStackBuffer != NULL ) && ( pxTaskDefinition->pxTaskBuffer != NULL ) )
632 /* Allocate space for the TCB. Where the memory comes from depends
633 * on the implementation of the port malloc function and whether or
634 * not static allocation is being used. */
635 pxNewTCB = ( TCB_t * ) pxTaskDefinition->pxTaskBuffer;
636 memset( ( void * ) pxNewTCB, 0x00, sizeof( TCB_t ) );
638 /* Store the stack location in the TCB. */
639 pxNewTCB->pxStack = pxTaskDefinition->puxStackBuffer;
641 #if ( tskSTATIC_AND_DYNAMIC_ALLOCATION_POSSIBLE != 0 )
643 /* Tasks can be created statically or dynamically, so note this
644 * task was created statically in case the task is later deleted. */
645 pxNewTCB->ucStaticallyAllocated = tskSTATICALLY_ALLOCATED_STACK_AND_TCB;
647 #endif /* tskSTATIC_AND_DYNAMIC_ALLOCATION_POSSIBLE */
649 prvInitialiseNewTask( pxTaskDefinition->pvTaskCode,
650 pxTaskDefinition->pcName,
651 ( uint32_t ) pxTaskDefinition->usStackDepth,
652 pxTaskDefinition->pvParameters,
653 pxTaskDefinition->uxPriority,
654 pxCreatedTask, pxNewTCB,
655 pxTaskDefinition->xRegions );
657 prvAddNewTaskToReadyList( pxNewTCB );
664 #endif /* ( portUSING_MPU_WRAPPERS == 1 ) && ( configSUPPORT_STATIC_ALLOCATION == 1 ) */
665 /*-----------------------------------------------------------*/
667 #if ( ( portUSING_MPU_WRAPPERS == 1 ) && ( configSUPPORT_DYNAMIC_ALLOCATION == 1 ) )
669 BaseType_t xTaskCreateRestricted( const TaskParameters_t * const pxTaskDefinition,
670 TaskHandle_t * pxCreatedTask )
673 BaseType_t xReturn = errCOULD_NOT_ALLOCATE_REQUIRED_MEMORY;
675 configASSERT( pxTaskDefinition->puxStackBuffer );
677 if( pxTaskDefinition->puxStackBuffer != NULL )
679 /* Allocate space for the TCB. Where the memory comes from depends
680 * on the implementation of the port malloc function and whether or
681 * not static allocation is being used. */
682 pxNewTCB = ( TCB_t * ) pvPortMalloc( sizeof( TCB_t ) );
684 if( pxNewTCB != NULL )
686 memset( ( void * ) pxNewTCB, 0x00, sizeof( TCB_t ) );
688 /* Store the stack location in the TCB. */
689 pxNewTCB->pxStack = pxTaskDefinition->puxStackBuffer;
691 #if ( tskSTATIC_AND_DYNAMIC_ALLOCATION_POSSIBLE != 0 )
693 /* Tasks can be created statically or dynamically, so note
694 * this task had a statically allocated stack in case it is
695 * later deleted. The TCB was allocated dynamically. */
696 pxNewTCB->ucStaticallyAllocated = tskSTATICALLY_ALLOCATED_STACK_ONLY;
698 #endif /* tskSTATIC_AND_DYNAMIC_ALLOCATION_POSSIBLE */
700 prvInitialiseNewTask( pxTaskDefinition->pvTaskCode,
701 pxTaskDefinition->pcName,
702 ( uint32_t ) pxTaskDefinition->usStackDepth,
703 pxTaskDefinition->pvParameters,
704 pxTaskDefinition->uxPriority,
705 pxCreatedTask, pxNewTCB,
706 pxTaskDefinition->xRegions );
708 prvAddNewTaskToReadyList( pxNewTCB );
716 #endif /* portUSING_MPU_WRAPPERS */
717 /*-----------------------------------------------------------*/
719 #if ( configSUPPORT_DYNAMIC_ALLOCATION == 1 )
721 BaseType_t xTaskCreate( TaskFunction_t pxTaskCode,
722 const char * const pcName, /*lint !e971 Unqualified char types are allowed for strings and single characters only. */
723 const configSTACK_DEPTH_TYPE usStackDepth,
724 void * const pvParameters,
725 UBaseType_t uxPriority,
726 TaskHandle_t * const pxCreatedTask )
731 /* If the stack grows down then allocate the stack then the TCB so the stack
732 * does not grow into the TCB. Likewise if the stack grows up then allocate
733 * the TCB then the stack. */
734 #if ( portSTACK_GROWTH > 0 )
736 /* Allocate space for the TCB. Where the memory comes from depends on
737 * the implementation of the port malloc function and whether or not static
738 * allocation is being used. */
739 pxNewTCB = ( TCB_t * ) pvPortMalloc( sizeof( TCB_t ) );
741 if( pxNewTCB != NULL )
743 memset( ( void * ) pxNewTCB, 0x00, sizeof( TCB_t ) );
745 /* Allocate space for the stack used by the task being created.
746 * The base of the stack memory stored in the TCB so the task can
747 * be deleted later if required. */
748 pxNewTCB->pxStack = ( StackType_t * ) pvPortMallocStack( ( ( ( size_t ) usStackDepth ) * sizeof( StackType_t ) ) ); /*lint !e961 MISRA exception as the casts are only redundant for some ports. */
750 if( pxNewTCB->pxStack == NULL )
752 /* Could not allocate the stack. Delete the allocated TCB. */
753 vPortFree( pxNewTCB );
758 #else /* portSTACK_GROWTH */
760 StackType_t * pxStack;
762 /* Allocate space for the stack used by the task being created. */
763 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. */
765 if( pxStack != NULL )
767 /* Allocate space for the TCB. */
768 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. */
770 if( pxNewTCB != NULL )
772 memset( ( void * ) pxNewTCB, 0x00, sizeof( TCB_t ) );
774 /* Store the stack location in the TCB. */
775 pxNewTCB->pxStack = pxStack;
779 /* The stack cannot be used as the TCB was not created. Free
781 vPortFreeStack( pxStack );
789 #endif /* portSTACK_GROWTH */
791 if( pxNewTCB != NULL )
793 #if ( tskSTATIC_AND_DYNAMIC_ALLOCATION_POSSIBLE != 0 ) /*lint !e9029 !e731 Macro has been consolidated for readability reasons. */
795 /* Tasks can be created statically or dynamically, so note this
796 * task was created dynamically in case it is later deleted. */
797 pxNewTCB->ucStaticallyAllocated = tskDYNAMICALLY_ALLOCATED_STACK_AND_TCB;
799 #endif /* tskSTATIC_AND_DYNAMIC_ALLOCATION_POSSIBLE */
801 prvInitialiseNewTask( pxTaskCode, pcName, ( uint32_t ) usStackDepth, pvParameters, uxPriority, pxCreatedTask, pxNewTCB, NULL );
802 prvAddNewTaskToReadyList( pxNewTCB );
807 xReturn = errCOULD_NOT_ALLOCATE_REQUIRED_MEMORY;
813 #endif /* configSUPPORT_DYNAMIC_ALLOCATION */
814 /*-----------------------------------------------------------*/
816 static void prvInitialiseNewTask( TaskFunction_t pxTaskCode,
817 const char * const pcName, /*lint !e971 Unqualified char types are allowed for strings and single characters only. */
818 const uint32_t ulStackDepth,
819 void * const pvParameters,
820 UBaseType_t uxPriority,
821 TaskHandle_t * const pxCreatedTask,
823 const MemoryRegion_t * const xRegions )
825 StackType_t * pxTopOfStack;
828 #if ( portUSING_MPU_WRAPPERS == 1 )
829 /* Should the task be created in privileged mode? */
830 BaseType_t xRunPrivileged;
832 if( ( uxPriority & portPRIVILEGE_BIT ) != 0U )
834 xRunPrivileged = pdTRUE;
838 xRunPrivileged = pdFALSE;
840 uxPriority &= ~portPRIVILEGE_BIT;
841 #endif /* portUSING_MPU_WRAPPERS == 1 */
843 /* Avoid dependency on memset() if it is not required. */
844 #if ( tskSET_NEW_STACKS_TO_KNOWN_VALUE == 1 )
846 /* Fill the stack with a known value to assist debugging. */
847 ( void ) memset( pxNewTCB->pxStack, ( int ) tskSTACK_FILL_BYTE, ( size_t ) ulStackDepth * sizeof( StackType_t ) );
849 #endif /* tskSET_NEW_STACKS_TO_KNOWN_VALUE */
851 /* Calculate the top of stack address. This depends on whether the stack
852 * grows from high memory to low (as per the 80x86) or vice versa.
853 * portSTACK_GROWTH is used to make the result positive or negative as required
855 #if ( portSTACK_GROWTH < 0 )
857 pxTopOfStack = &( pxNewTCB->pxStack[ ulStackDepth - ( uint32_t ) 1 ] );
858 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(). */
860 /* Check the alignment of the calculated top of stack is correct. */
861 configASSERT( ( ( ( portPOINTER_SIZE_TYPE ) pxTopOfStack & ( portPOINTER_SIZE_TYPE ) portBYTE_ALIGNMENT_MASK ) == 0UL ) );
863 #if ( configRECORD_STACK_HIGH_ADDRESS == 1 )
865 /* Also record the stack's high address, which may assist
867 pxNewTCB->pxEndOfStack = pxTopOfStack;
869 #endif /* configRECORD_STACK_HIGH_ADDRESS */
871 #else /* portSTACK_GROWTH */
873 pxTopOfStack = pxNewTCB->pxStack;
875 /* Check the alignment of the stack buffer is correct. */
876 configASSERT( ( ( ( portPOINTER_SIZE_TYPE ) pxNewTCB->pxStack & ( portPOINTER_SIZE_TYPE ) portBYTE_ALIGNMENT_MASK ) == 0UL ) );
878 /* The other extreme of the stack space is required if stack checking is
880 pxNewTCB->pxEndOfStack = pxNewTCB->pxStack + ( ulStackDepth - ( uint32_t ) 1 );
882 #endif /* portSTACK_GROWTH */
884 /* Store the task name in the TCB. */
887 for( x = ( UBaseType_t ) 0; x < ( UBaseType_t ) configMAX_TASK_NAME_LEN; x++ )
889 pxNewTCB->pcTaskName[ x ] = pcName[ x ];
891 /* Don't copy all configMAX_TASK_NAME_LEN if the string is shorter than
892 * configMAX_TASK_NAME_LEN characters just in case the memory after the
893 * string is not accessible (extremely unlikely). */
894 if( pcName[ x ] == ( char ) 0x00 )
900 mtCOVERAGE_TEST_MARKER();
904 /* Ensure the name string is terminated in the case that the string length
905 * was greater or equal to configMAX_TASK_NAME_LEN. */
906 pxNewTCB->pcTaskName[ configMAX_TASK_NAME_LEN - 1 ] = '\0';
910 mtCOVERAGE_TEST_MARKER();
913 /* This is used as an array index so must ensure it's not too large. */
914 configASSERT( uxPriority < configMAX_PRIORITIES );
916 if( uxPriority >= ( UBaseType_t ) configMAX_PRIORITIES )
918 uxPriority = ( UBaseType_t ) configMAX_PRIORITIES - ( UBaseType_t ) 1U;
922 mtCOVERAGE_TEST_MARKER();
925 pxNewTCB->uxPriority = uxPriority;
926 #if ( configUSE_MUTEXES == 1 )
928 pxNewTCB->uxBasePriority = uxPriority;
930 #endif /* configUSE_MUTEXES */
932 vListInitialiseItem( &( pxNewTCB->xStateListItem ) );
933 vListInitialiseItem( &( pxNewTCB->xEventListItem ) );
935 /* Set the pxNewTCB as a link back from the ListItem_t. This is so we can get
936 * back to the containing TCB from a generic item in a list. */
937 listSET_LIST_ITEM_OWNER( &( pxNewTCB->xStateListItem ), pxNewTCB );
939 /* Event lists are always in priority order. */
940 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. */
941 listSET_LIST_ITEM_OWNER( &( pxNewTCB->xEventListItem ), pxNewTCB );
943 #if ( portUSING_MPU_WRAPPERS == 1 )
945 vPortStoreTaskMPUSettings( &( pxNewTCB->xMPUSettings ), xRegions, pxNewTCB->pxStack, ulStackDepth );
949 /* Avoid compiler warning about unreferenced parameter. */
954 #if ( ( configUSE_NEWLIB_REENTRANT == 1 ) || ( configUSE_C_RUNTIME_TLS_SUPPORT == 1 ) )
956 /* Allocate and initialize memory for the task's TLS Block. */
957 configINIT_TLS_BLOCK( pxNewTCB->xTLSBlock );
961 /* Initialize the TCB stack to look as if the task was already running,
962 * but had been interrupted by the scheduler. The return address is set
963 * to the start of the task function. Once the stack has been initialised
964 * the top of stack variable is updated. */
965 #if ( portUSING_MPU_WRAPPERS == 1 )
967 /* If the port has capability to detect stack overflow,
968 * pass the stack end address to the stack initialization
969 * function as well. */
970 #if ( portHAS_STACK_OVERFLOW_CHECKING == 1 )
972 #if ( portSTACK_GROWTH < 0 )
974 pxNewTCB->pxTopOfStack = pxPortInitialiseStack( pxTopOfStack, pxNewTCB->pxStack, pxTaskCode, pvParameters, xRunPrivileged );
976 #else /* portSTACK_GROWTH */
978 pxNewTCB->pxTopOfStack = pxPortInitialiseStack( pxTopOfStack, pxNewTCB->pxEndOfStack, pxTaskCode, pvParameters, xRunPrivileged );
980 #endif /* portSTACK_GROWTH */
982 #else /* portHAS_STACK_OVERFLOW_CHECKING */
984 pxNewTCB->pxTopOfStack = pxPortInitialiseStack( pxTopOfStack, pxTaskCode, pvParameters, xRunPrivileged );
986 #endif /* portHAS_STACK_OVERFLOW_CHECKING */
988 #else /* portUSING_MPU_WRAPPERS */
990 /* If the port has capability to detect stack overflow,
991 * pass the stack end address to the stack initialization
992 * function as well. */
993 #if ( portHAS_STACK_OVERFLOW_CHECKING == 1 )
995 #if ( portSTACK_GROWTH < 0 )
997 pxNewTCB->pxTopOfStack = pxPortInitialiseStack( pxTopOfStack, pxNewTCB->pxStack, pxTaskCode, pvParameters );
999 #else /* portSTACK_GROWTH */
1001 pxNewTCB->pxTopOfStack = pxPortInitialiseStack( pxTopOfStack, pxNewTCB->pxEndOfStack, pxTaskCode, pvParameters );
1003 #endif /* portSTACK_GROWTH */
1005 #else /* portHAS_STACK_OVERFLOW_CHECKING */
1007 pxNewTCB->pxTopOfStack = pxPortInitialiseStack( pxTopOfStack, pxTaskCode, pvParameters );
1009 #endif /* portHAS_STACK_OVERFLOW_CHECKING */
1011 #endif /* portUSING_MPU_WRAPPERS */
1013 if( pxCreatedTask != NULL )
1015 /* Pass the handle out in an anonymous way. The handle can be used to
1016 * change the created task's priority, delete the created task, etc.*/
1017 *pxCreatedTask = ( TaskHandle_t ) pxNewTCB;
1021 mtCOVERAGE_TEST_MARKER();
1024 /*-----------------------------------------------------------*/
1026 static void prvAddNewTaskToReadyList( TCB_t * pxNewTCB )
1028 /* Ensure interrupts don't access the task lists while the lists are being
1030 taskENTER_CRITICAL();
1032 uxCurrentNumberOfTasks++;
1034 if( pxCurrentTCB == NULL )
1036 /* There are no other tasks, or all the other tasks are in
1037 * the suspended state - make this the current task. */
1038 pxCurrentTCB = pxNewTCB;
1040 if( uxCurrentNumberOfTasks == ( UBaseType_t ) 1 )
1042 /* This is the first task to be created so do the preliminary
1043 * initialisation required. We will not recover if this call
1044 * fails, but we will report the failure. */
1045 prvInitialiseTaskLists();
1049 mtCOVERAGE_TEST_MARKER();
1054 /* If the scheduler is not already running, make this task the
1055 * current task if it is the highest priority task to be created
1057 if( xSchedulerRunning == pdFALSE )
1059 if( pxCurrentTCB->uxPriority <= pxNewTCB->uxPriority )
1061 pxCurrentTCB = pxNewTCB;
1065 mtCOVERAGE_TEST_MARKER();
1070 mtCOVERAGE_TEST_MARKER();
1076 #if ( configUSE_TRACE_FACILITY == 1 )
1078 /* Add a counter into the TCB for tracing only. */
1079 pxNewTCB->uxTCBNumber = uxTaskNumber;
1081 #endif /* configUSE_TRACE_FACILITY */
1082 traceTASK_CREATE( pxNewTCB );
1084 prvAddTaskToReadyList( pxNewTCB );
1086 portSETUP_TCB( pxNewTCB );
1088 taskEXIT_CRITICAL();
1090 if( xSchedulerRunning != pdFALSE )
1092 /* If the created task is of a higher priority than the current task
1093 * then it should run now. */
1094 if( pxCurrentTCB->uxPriority < pxNewTCB->uxPriority )
1096 taskYIELD_IF_USING_PREEMPTION();
1100 mtCOVERAGE_TEST_MARKER();
1105 mtCOVERAGE_TEST_MARKER();
1108 /*-----------------------------------------------------------*/
1110 #if ( INCLUDE_vTaskDelete == 1 )
1112 void vTaskDelete( TaskHandle_t xTaskToDelete )
1116 taskENTER_CRITICAL();
1118 /* If null is passed in here then it is the calling task that is
1120 pxTCB = prvGetTCBFromHandle( xTaskToDelete );
1122 /* Remove task from the ready/delayed list. */
1123 if( uxListRemove( &( pxTCB->xStateListItem ) ) == ( UBaseType_t ) 0 )
1125 taskRESET_READY_PRIORITY( pxTCB->uxPriority );
1129 mtCOVERAGE_TEST_MARKER();
1132 /* Is the task waiting on an event also? */
1133 if( listLIST_ITEM_CONTAINER( &( pxTCB->xEventListItem ) ) != NULL )
1135 ( void ) uxListRemove( &( pxTCB->xEventListItem ) );
1139 mtCOVERAGE_TEST_MARKER();
1142 /* Increment the uxTaskNumber also so kernel aware debuggers can
1143 * detect that the task lists need re-generating. This is done before
1144 * portPRE_TASK_DELETE_HOOK() as in the Windows port that macro will
1148 if( pxTCB == pxCurrentTCB )
1150 /* A task is deleting itself. This cannot complete within the
1151 * task itself, as a context switch to another task is required.
1152 * Place the task in the termination list. The idle task will
1153 * check the termination list and free up any memory allocated by
1154 * the scheduler for the TCB and stack of the deleted task. */
1155 vListInsertEnd( &xTasksWaitingTermination, &( pxTCB->xStateListItem ) );
1157 /* Increment the ucTasksDeleted variable so the idle task knows
1158 * there is a task that has been deleted and that it should therefore
1159 * check the xTasksWaitingTermination list. */
1160 ++uxDeletedTasksWaitingCleanUp;
1162 /* Call the delete hook before portPRE_TASK_DELETE_HOOK() as
1163 * portPRE_TASK_DELETE_HOOK() does not return in the Win32 port. */
1164 traceTASK_DELETE( pxTCB );
1166 /* The pre-delete hook is primarily for the Windows simulator,
1167 * in which Windows specific clean up operations are performed,
1168 * after which it is not possible to yield away from this task -
1169 * hence xYieldPending is used to latch that a context switch is
1171 portPRE_TASK_DELETE_HOOK( pxTCB, &xYieldPending );
1175 --uxCurrentNumberOfTasks;
1176 traceTASK_DELETE( pxTCB );
1178 /* Reset the next expected unblock time in case it referred to
1179 * the task that has just been deleted. */
1180 prvResetNextTaskUnblockTime();
1183 taskEXIT_CRITICAL();
1185 /* If the task is not deleting itself, call prvDeleteTCB from outside of
1186 * critical section. If a task deletes itself, prvDeleteTCB is called
1187 * from prvCheckTasksWaitingTermination which is called from Idle task. */
1188 if( pxTCB != pxCurrentTCB )
1190 prvDeleteTCB( pxTCB );
1193 /* Force a reschedule if it is the currently running task that has just
1195 if( xSchedulerRunning != pdFALSE )
1197 if( pxTCB == pxCurrentTCB )
1199 configASSERT( uxSchedulerSuspended == 0 );
1200 portYIELD_WITHIN_API();
1204 mtCOVERAGE_TEST_MARKER();
1209 #endif /* INCLUDE_vTaskDelete */
1210 /*-----------------------------------------------------------*/
1212 #if ( INCLUDE_xTaskDelayUntil == 1 )
1214 BaseType_t xTaskDelayUntil( TickType_t * const pxPreviousWakeTime,
1215 const TickType_t xTimeIncrement )
1217 TickType_t xTimeToWake;
1218 BaseType_t xAlreadyYielded, xShouldDelay = pdFALSE;
1220 configASSERT( pxPreviousWakeTime );
1221 configASSERT( ( xTimeIncrement > 0U ) );
1222 configASSERT( uxSchedulerSuspended == 0 );
1226 /* Minor optimisation. The tick count cannot change in this
1228 const TickType_t xConstTickCount = xTickCount;
1230 /* Generate the tick time at which the task wants to wake. */
1231 xTimeToWake = *pxPreviousWakeTime + xTimeIncrement;
1233 if( xConstTickCount < *pxPreviousWakeTime )
1235 /* The tick count has overflowed since this function was
1236 * lasted called. In this case the only time we should ever
1237 * actually delay is if the wake time has also overflowed,
1238 * and the wake time is greater than the tick time. When this
1239 * is the case it is as if neither time had overflowed. */
1240 if( ( xTimeToWake < *pxPreviousWakeTime ) && ( xTimeToWake > xConstTickCount ) )
1242 xShouldDelay = pdTRUE;
1246 mtCOVERAGE_TEST_MARKER();
1251 /* The tick time has not overflowed. In this case we will
1252 * delay if either the wake time has overflowed, and/or the
1253 * tick time is less than the wake time. */
1254 if( ( xTimeToWake < *pxPreviousWakeTime ) || ( xTimeToWake > xConstTickCount ) )
1256 xShouldDelay = pdTRUE;
1260 mtCOVERAGE_TEST_MARKER();
1264 /* Update the wake time ready for the next call. */
1265 *pxPreviousWakeTime = xTimeToWake;
1267 if( xShouldDelay != pdFALSE )
1269 traceTASK_DELAY_UNTIL( xTimeToWake );
1271 /* prvAddCurrentTaskToDelayedList() needs the block time, not
1272 * the time to wake, so subtract the current tick count. */
1273 prvAddCurrentTaskToDelayedList( xTimeToWake - xConstTickCount, pdFALSE );
1277 mtCOVERAGE_TEST_MARKER();
1280 xAlreadyYielded = xTaskResumeAll();
1282 /* Force a reschedule if xTaskResumeAll has not already done so, we may
1283 * have put ourselves to sleep. */
1284 if( xAlreadyYielded == pdFALSE )
1286 portYIELD_WITHIN_API();
1290 mtCOVERAGE_TEST_MARKER();
1293 return xShouldDelay;
1296 #endif /* INCLUDE_xTaskDelayUntil */
1297 /*-----------------------------------------------------------*/
1299 #if ( INCLUDE_vTaskDelay == 1 )
1301 void vTaskDelay( const TickType_t xTicksToDelay )
1303 BaseType_t xAlreadyYielded = pdFALSE;
1305 /* A delay time of zero just forces a reschedule. */
1306 if( xTicksToDelay > ( TickType_t ) 0U )
1308 configASSERT( uxSchedulerSuspended == 0 );
1313 /* A task that is removed from the event list while the
1314 * scheduler is suspended will not get placed in the ready
1315 * list or removed from the blocked list until the scheduler
1318 * This task cannot be in an event list as it is the currently
1319 * executing task. */
1320 prvAddCurrentTaskToDelayedList( xTicksToDelay, pdFALSE );
1322 xAlreadyYielded = xTaskResumeAll();
1326 mtCOVERAGE_TEST_MARKER();
1329 /* Force a reschedule if xTaskResumeAll has not already done so, we may
1330 * have put ourselves to sleep. */
1331 if( xAlreadyYielded == pdFALSE )
1333 portYIELD_WITHIN_API();
1337 mtCOVERAGE_TEST_MARKER();
1341 #endif /* INCLUDE_vTaskDelay */
1342 /*-----------------------------------------------------------*/
1344 #if ( ( INCLUDE_eTaskGetState == 1 ) || ( configUSE_TRACE_FACILITY == 1 ) || ( INCLUDE_xTaskAbortDelay == 1 ) )
1346 eTaskState eTaskGetState( TaskHandle_t xTask )
1349 List_t const * pxStateList;
1350 List_t const * pxDelayedList;
1351 List_t const * pxOverflowedDelayedList;
1352 const TCB_t * const pxTCB = xTask;
1354 configASSERT( pxTCB );
1356 if( pxTCB == pxCurrentTCB )
1358 /* The task calling this function is querying its own state. */
1363 taskENTER_CRITICAL();
1365 pxStateList = listLIST_ITEM_CONTAINER( &( pxTCB->xStateListItem ) );
1366 pxDelayedList = pxDelayedTaskList;
1367 pxOverflowedDelayedList = pxOverflowDelayedTaskList;
1369 taskEXIT_CRITICAL();
1371 if( ( pxStateList == pxDelayedList ) || ( pxStateList == pxOverflowedDelayedList ) )
1373 /* The task being queried is referenced from one of the Blocked
1378 #if ( INCLUDE_vTaskSuspend == 1 )
1379 else if( pxStateList == &xSuspendedTaskList )
1381 /* The task being queried is referenced from the suspended
1382 * list. Is it genuinely suspended or is it blocked
1384 if( listLIST_ITEM_CONTAINER( &( pxTCB->xEventListItem ) ) == NULL )
1386 #if ( configUSE_TASK_NOTIFICATIONS == 1 )
1390 /* The task does not appear on the event list item of
1391 * and of the RTOS objects, but could still be in the
1392 * blocked state if it is waiting on its notification
1393 * rather than waiting on an object. If not, is
1395 eReturn = eSuspended;
1397 for( x = 0; x < configTASK_NOTIFICATION_ARRAY_ENTRIES; x++ )
1399 if( pxTCB->ucNotifyState[ x ] == taskWAITING_NOTIFICATION )
1406 #else /* if ( configUSE_TASK_NOTIFICATIONS == 1 ) */
1408 eReturn = eSuspended;
1410 #endif /* if ( configUSE_TASK_NOTIFICATIONS == 1 ) */
1417 #endif /* if ( INCLUDE_vTaskSuspend == 1 ) */
1419 #if ( INCLUDE_vTaskDelete == 1 )
1420 else if( ( pxStateList == &xTasksWaitingTermination ) || ( pxStateList == NULL ) )
1422 /* The task being queried is referenced from the deleted
1423 * tasks list, or it is not referenced from any lists at
1429 else /*lint !e525 Negative indentation is intended to make use of pre-processor clearer. */
1431 /* If the task is not in any other state, it must be in the
1432 * Ready (including pending ready) state. */
1438 } /*lint !e818 xTask cannot be a pointer to const because it is a typedef. */
1440 #endif /* INCLUDE_eTaskGetState */
1441 /*-----------------------------------------------------------*/
1443 #if ( INCLUDE_uxTaskPriorityGet == 1 )
1445 UBaseType_t uxTaskPriorityGet( const TaskHandle_t xTask )
1447 TCB_t const * pxTCB;
1448 UBaseType_t uxReturn;
1450 taskENTER_CRITICAL();
1452 /* If null is passed in here then it is the priority of the task
1453 * that called uxTaskPriorityGet() that is being queried. */
1454 pxTCB = prvGetTCBFromHandle( xTask );
1455 uxReturn = pxTCB->uxPriority;
1457 taskEXIT_CRITICAL();
1462 #endif /* INCLUDE_uxTaskPriorityGet */
1463 /*-----------------------------------------------------------*/
1465 #if ( INCLUDE_uxTaskPriorityGet == 1 )
1467 UBaseType_t uxTaskPriorityGetFromISR( const TaskHandle_t xTask )
1469 TCB_t const * pxTCB;
1470 UBaseType_t uxReturn, uxSavedInterruptState;
1472 /* RTOS ports that support interrupt nesting have the concept of a
1473 * maximum system call (or maximum API call) interrupt priority.
1474 * Interrupts that are above the maximum system call priority are keep
1475 * permanently enabled, even when the RTOS kernel is in a critical section,
1476 * but cannot make any calls to FreeRTOS API functions. If configASSERT()
1477 * is defined in FreeRTOSConfig.h then
1478 * portASSERT_IF_INTERRUPT_PRIORITY_INVALID() will result in an assertion
1479 * failure if a FreeRTOS API function is called from an interrupt that has
1480 * been assigned a priority above the configured maximum system call
1481 * priority. Only FreeRTOS functions that end in FromISR can be called
1482 * from interrupts that have been assigned a priority at or (logically)
1483 * below the maximum system call interrupt priority. FreeRTOS maintains a
1484 * separate interrupt safe API to ensure interrupt entry is as fast and as
1485 * simple as possible. More information (albeit Cortex-M specific) is
1486 * provided on the following link:
1487 * https://www.FreeRTOS.org/RTOS-Cortex-M3-M4.html */
1488 portASSERT_IF_INTERRUPT_PRIORITY_INVALID();
1490 uxSavedInterruptState = portSET_INTERRUPT_MASK_FROM_ISR();
1492 /* If null is passed in here then it is the priority of the calling
1493 * task that is being queried. */
1494 pxTCB = prvGetTCBFromHandle( xTask );
1495 uxReturn = pxTCB->uxPriority;
1497 portCLEAR_INTERRUPT_MASK_FROM_ISR( uxSavedInterruptState );
1502 #endif /* INCLUDE_uxTaskPriorityGet */
1503 /*-----------------------------------------------------------*/
1505 #if ( INCLUDE_vTaskPrioritySet == 1 )
1507 void vTaskPrioritySet( TaskHandle_t xTask,
1508 UBaseType_t uxNewPriority )
1511 UBaseType_t uxCurrentBasePriority, uxPriorityUsedOnEntry;
1512 BaseType_t xYieldRequired = pdFALSE;
1514 configASSERT( uxNewPriority < configMAX_PRIORITIES );
1516 /* Ensure the new priority is valid. */
1517 if( uxNewPriority >= ( UBaseType_t ) configMAX_PRIORITIES )
1519 uxNewPriority = ( UBaseType_t ) configMAX_PRIORITIES - ( UBaseType_t ) 1U;
1523 mtCOVERAGE_TEST_MARKER();
1526 taskENTER_CRITICAL();
1528 /* If null is passed in here then it is the priority of the calling
1529 * task that is being changed. */
1530 pxTCB = prvGetTCBFromHandle( xTask );
1532 traceTASK_PRIORITY_SET( pxTCB, uxNewPriority );
1534 #if ( configUSE_MUTEXES == 1 )
1536 uxCurrentBasePriority = pxTCB->uxBasePriority;
1540 uxCurrentBasePriority = pxTCB->uxPriority;
1544 if( uxCurrentBasePriority != uxNewPriority )
1546 /* The priority change may have readied a task of higher
1547 * priority than the calling task. */
1548 if( uxNewPriority > uxCurrentBasePriority )
1550 if( pxTCB != pxCurrentTCB )
1552 /* The priority of a task other than the currently
1553 * running task is being raised. Is the priority being
1554 * raised above that of the running task? */
1555 if( uxNewPriority > pxCurrentTCB->uxPriority )
1557 xYieldRequired = pdTRUE;
1561 mtCOVERAGE_TEST_MARKER();
1566 /* The priority of the running task is being raised,
1567 * but the running task must already be the highest
1568 * priority task able to run so no yield is required. */
1571 else if( pxTCB == pxCurrentTCB )
1573 /* Setting the priority of the running task down means
1574 * there may now be another task of higher priority that
1575 * is ready to execute. */
1576 xYieldRequired = pdTRUE;
1580 /* Setting the priority of any other task down does not
1581 * require a yield as the running task must be above the
1582 * new priority of the task being modified. */
1585 /* Remember the ready list the task might be referenced from
1586 * before its uxPriority member is changed so the
1587 * taskRESET_READY_PRIORITY() macro can function correctly. */
1588 uxPriorityUsedOnEntry = pxTCB->uxPriority;
1590 #if ( configUSE_MUTEXES == 1 )
1592 /* Only change the priority being used if the task is not
1593 * currently using an inherited priority. */
1594 if( pxTCB->uxBasePriority == pxTCB->uxPriority )
1596 pxTCB->uxPriority = uxNewPriority;
1600 mtCOVERAGE_TEST_MARKER();
1603 /* The base priority gets set whatever. */
1604 pxTCB->uxBasePriority = uxNewPriority;
1606 #else /* if ( configUSE_MUTEXES == 1 ) */
1608 pxTCB->uxPriority = uxNewPriority;
1610 #endif /* if ( configUSE_MUTEXES == 1 ) */
1612 /* Only reset the event list item value if the value is not
1613 * being used for anything else. */
1614 if( ( listGET_LIST_ITEM_VALUE( &( pxTCB->xEventListItem ) ) & taskEVENT_LIST_ITEM_VALUE_IN_USE ) == 0UL )
1616 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. */
1620 mtCOVERAGE_TEST_MARKER();
1623 /* If the task is in the blocked or suspended list we need do
1624 * nothing more than change its priority variable. However, if
1625 * the task is in a ready list it needs to be removed and placed
1626 * in the list appropriate to its new priority. */
1627 if( listIS_CONTAINED_WITHIN( &( pxReadyTasksLists[ uxPriorityUsedOnEntry ] ), &( pxTCB->xStateListItem ) ) != pdFALSE )
1629 /* The task is currently in its ready list - remove before
1630 * adding it to its new ready list. As we are in a critical
1631 * section we can do this even if the scheduler is suspended. */
1632 if( uxListRemove( &( pxTCB->xStateListItem ) ) == ( UBaseType_t ) 0 )
1634 /* It is known that the task is in its ready list so
1635 * there is no need to check again and the port level
1636 * reset macro can be called directly. */
1637 portRESET_READY_PRIORITY( uxPriorityUsedOnEntry, uxTopReadyPriority );
1641 mtCOVERAGE_TEST_MARKER();
1644 prvAddTaskToReadyList( pxTCB );
1648 mtCOVERAGE_TEST_MARKER();
1651 if( xYieldRequired != pdFALSE )
1653 taskYIELD_IF_USING_PREEMPTION();
1657 mtCOVERAGE_TEST_MARKER();
1660 /* Remove compiler warning about unused variables when the port
1661 * optimised task selection is not being used. */
1662 ( void ) uxPriorityUsedOnEntry;
1665 taskEXIT_CRITICAL();
1668 #endif /* INCLUDE_vTaskPrioritySet */
1669 /*-----------------------------------------------------------*/
1671 #if ( INCLUDE_vTaskSuspend == 1 )
1673 void vTaskSuspend( TaskHandle_t xTaskToSuspend )
1677 taskENTER_CRITICAL();
1679 /* If null is passed in here then it is the running task that is
1680 * being suspended. */
1681 pxTCB = prvGetTCBFromHandle( xTaskToSuspend );
1683 traceTASK_SUSPEND( pxTCB );
1685 /* Remove task from the ready/delayed list and place in the
1686 * suspended list. */
1687 if( uxListRemove( &( pxTCB->xStateListItem ) ) == ( UBaseType_t ) 0 )
1689 taskRESET_READY_PRIORITY( pxTCB->uxPriority );
1693 mtCOVERAGE_TEST_MARKER();
1696 /* Is the task waiting on an event also? */
1697 if( listLIST_ITEM_CONTAINER( &( pxTCB->xEventListItem ) ) != NULL )
1699 ( void ) uxListRemove( &( pxTCB->xEventListItem ) );
1703 mtCOVERAGE_TEST_MARKER();
1706 vListInsertEnd( &xSuspendedTaskList, &( pxTCB->xStateListItem ) );
1708 #if ( configUSE_TASK_NOTIFICATIONS == 1 )
1712 for( x = 0; x < configTASK_NOTIFICATION_ARRAY_ENTRIES; x++ )
1714 if( pxTCB->ucNotifyState[ x ] == taskWAITING_NOTIFICATION )
1716 /* The task was blocked to wait for a notification, but is
1717 * now suspended, so no notification was received. */
1718 pxTCB->ucNotifyState[ x ] = taskNOT_WAITING_NOTIFICATION;
1722 #endif /* if ( configUSE_TASK_NOTIFICATIONS == 1 ) */
1724 taskEXIT_CRITICAL();
1726 if( xSchedulerRunning != pdFALSE )
1728 /* Reset the next expected unblock time in case it referred to the
1729 * task that is now in the Suspended state. */
1730 taskENTER_CRITICAL();
1732 prvResetNextTaskUnblockTime();
1734 taskEXIT_CRITICAL();
1738 mtCOVERAGE_TEST_MARKER();
1741 if( pxTCB == pxCurrentTCB )
1743 if( xSchedulerRunning != pdFALSE )
1745 /* The current task has just been suspended. */
1746 configASSERT( uxSchedulerSuspended == 0 );
1747 portYIELD_WITHIN_API();
1751 /* The scheduler is not running, but the task that was pointed
1752 * to by pxCurrentTCB has just been suspended and pxCurrentTCB
1753 * must be adjusted to point to a different task. */
1754 if( listCURRENT_LIST_LENGTH( &xSuspendedTaskList ) == uxCurrentNumberOfTasks ) /*lint !e931 Right has no side effect, just volatile. */
1756 /* No other tasks are ready, so set pxCurrentTCB back to
1757 * NULL so when the next task is created pxCurrentTCB will
1758 * be set to point to it no matter what its relative priority
1760 pxCurrentTCB = NULL;
1764 vTaskSwitchContext();
1770 mtCOVERAGE_TEST_MARKER();
1774 #endif /* INCLUDE_vTaskSuspend */
1775 /*-----------------------------------------------------------*/
1777 #if ( INCLUDE_vTaskSuspend == 1 )
1779 static BaseType_t prvTaskIsTaskSuspended( const TaskHandle_t xTask )
1781 BaseType_t xReturn = pdFALSE;
1782 const TCB_t * const pxTCB = xTask;
1784 /* Accesses xPendingReadyList so must be called from a critical
1787 /* It does not make sense to check if the calling task is suspended. */
1788 configASSERT( xTask );
1790 /* Is the task being resumed actually in the suspended list? */
1791 if( listIS_CONTAINED_WITHIN( &xSuspendedTaskList, &( pxTCB->xStateListItem ) ) != pdFALSE )
1793 /* Has the task already been resumed from within an ISR? */
1794 if( listIS_CONTAINED_WITHIN( &xPendingReadyList, &( pxTCB->xEventListItem ) ) == pdFALSE )
1796 /* Is it in the suspended list because it is in the Suspended
1797 * state, or because is is blocked with no timeout? */
1798 if( listIS_CONTAINED_WITHIN( NULL, &( pxTCB->xEventListItem ) ) != pdFALSE ) /*lint !e961. The cast is only redundant when NULL is used. */
1804 mtCOVERAGE_TEST_MARKER();
1809 mtCOVERAGE_TEST_MARKER();
1814 mtCOVERAGE_TEST_MARKER();
1818 } /*lint !e818 xTask cannot be a pointer to const because it is a typedef. */
1820 #endif /* INCLUDE_vTaskSuspend */
1821 /*-----------------------------------------------------------*/
1823 #if ( INCLUDE_vTaskSuspend == 1 )
1825 void vTaskResume( TaskHandle_t xTaskToResume )
1827 TCB_t * const pxTCB = xTaskToResume;
1829 /* It does not make sense to resume the calling task. */
1830 configASSERT( xTaskToResume );
1832 /* The parameter cannot be NULL as it is impossible to resume the
1833 * currently executing task. */
1834 if( ( pxTCB != pxCurrentTCB ) && ( pxTCB != NULL ) )
1836 taskENTER_CRITICAL();
1838 if( prvTaskIsTaskSuspended( pxTCB ) != pdFALSE )
1840 traceTASK_RESUME( pxTCB );
1842 /* The ready list can be accessed even if the scheduler is
1843 * suspended because this is inside a critical section. */
1844 ( void ) uxListRemove( &( pxTCB->xStateListItem ) );
1845 prvAddTaskToReadyList( pxTCB );
1847 /* A higher priority task may have just been resumed. */
1848 if( pxTCB->uxPriority > pxCurrentTCB->uxPriority )
1850 /* This yield may not cause the task just resumed to run,
1851 * but will leave the lists in the correct state for the
1853 taskYIELD_IF_USING_PREEMPTION();
1857 mtCOVERAGE_TEST_MARKER();
1862 mtCOVERAGE_TEST_MARKER();
1865 taskEXIT_CRITICAL();
1869 mtCOVERAGE_TEST_MARKER();
1873 #endif /* INCLUDE_vTaskSuspend */
1875 /*-----------------------------------------------------------*/
1877 #if ( ( INCLUDE_xTaskResumeFromISR == 1 ) && ( INCLUDE_vTaskSuspend == 1 ) )
1879 BaseType_t xTaskResumeFromISR( TaskHandle_t xTaskToResume )
1881 BaseType_t xYieldRequired = pdFALSE;
1882 TCB_t * const pxTCB = xTaskToResume;
1883 UBaseType_t uxSavedInterruptStatus;
1885 configASSERT( xTaskToResume );
1887 /* RTOS ports that support interrupt nesting have the concept of a
1888 * maximum system call (or maximum API call) interrupt priority.
1889 * Interrupts that are above the maximum system call priority are keep
1890 * permanently enabled, even when the RTOS kernel is in a critical section,
1891 * but cannot make any calls to FreeRTOS API functions. If configASSERT()
1892 * is defined in FreeRTOSConfig.h then
1893 * portASSERT_IF_INTERRUPT_PRIORITY_INVALID() will result in an assertion
1894 * failure if a FreeRTOS API function is called from an interrupt that has
1895 * been assigned a priority above the configured maximum system call
1896 * priority. Only FreeRTOS functions that end in FromISR can be called
1897 * from interrupts that have been assigned a priority at or (logically)
1898 * below the maximum system call interrupt priority. FreeRTOS maintains a
1899 * separate interrupt safe API to ensure interrupt entry is as fast and as
1900 * simple as possible. More information (albeit Cortex-M specific) is
1901 * provided on the following link:
1902 * https://www.FreeRTOS.org/RTOS-Cortex-M3-M4.html */
1903 portASSERT_IF_INTERRUPT_PRIORITY_INVALID();
1905 uxSavedInterruptStatus = portSET_INTERRUPT_MASK_FROM_ISR();
1907 if( prvTaskIsTaskSuspended( pxTCB ) != pdFALSE )
1909 traceTASK_RESUME_FROM_ISR( pxTCB );
1911 /* Check the ready lists can be accessed. */
1912 if( uxSchedulerSuspended == ( UBaseType_t ) pdFALSE )
1914 /* Ready lists can be accessed so move the task from the
1915 * suspended list to the ready list directly. */
1916 if( pxTCB->uxPriority > pxCurrentTCB->uxPriority )
1918 xYieldRequired = pdTRUE;
1920 /* Mark that a yield is pending in case the user is not
1921 * using the return value to initiate a context switch
1922 * from the ISR using portYIELD_FROM_ISR. */
1923 xYieldPending = pdTRUE;
1927 mtCOVERAGE_TEST_MARKER();
1930 ( void ) uxListRemove( &( pxTCB->xStateListItem ) );
1931 prvAddTaskToReadyList( pxTCB );
1935 /* The delayed or ready lists cannot be accessed so the task
1936 * is held in the pending ready list until the scheduler is
1938 vListInsertEnd( &( xPendingReadyList ), &( pxTCB->xEventListItem ) );
1943 mtCOVERAGE_TEST_MARKER();
1946 portCLEAR_INTERRUPT_MASK_FROM_ISR( uxSavedInterruptStatus );
1948 return xYieldRequired;
1951 #endif /* ( ( INCLUDE_xTaskResumeFromISR == 1 ) && ( INCLUDE_vTaskSuspend == 1 ) ) */
1952 /*-----------------------------------------------------------*/
1954 void vTaskStartScheduler( void )
1958 /* Add the idle task at the lowest priority. */
1959 #if ( configSUPPORT_STATIC_ALLOCATION == 1 )
1961 StaticTask_t * pxIdleTaskTCBBuffer = NULL;
1962 StackType_t * pxIdleTaskStackBuffer = NULL;
1963 uint32_t ulIdleTaskStackSize;
1965 /* The Idle task is created using user provided RAM - obtain the
1966 * address of the RAM then create the idle task. */
1967 vApplicationGetIdleTaskMemory( &pxIdleTaskTCBBuffer, &pxIdleTaskStackBuffer, &ulIdleTaskStackSize );
1968 xIdleTaskHandle = xTaskCreateStatic( prvIdleTask,
1969 configIDLE_TASK_NAME,
1970 ulIdleTaskStackSize,
1971 ( void * ) NULL, /*lint !e961. The cast is not redundant for all compilers. */
1972 portPRIVILEGE_BIT, /* In effect ( tskIDLE_PRIORITY | portPRIVILEGE_BIT ), but tskIDLE_PRIORITY is zero. */
1973 pxIdleTaskStackBuffer,
1974 pxIdleTaskTCBBuffer ); /*lint !e961 MISRA exception, justified as it is not a redundant explicit cast to all supported compilers. */
1976 if( xIdleTaskHandle != NULL )
1985 #else /* if ( configSUPPORT_STATIC_ALLOCATION == 1 ) */
1987 /* The Idle task is being created using dynamically allocated RAM. */
1988 xReturn = xTaskCreate( prvIdleTask,
1989 configIDLE_TASK_NAME,
1990 configMINIMAL_STACK_SIZE,
1992 portPRIVILEGE_BIT, /* In effect ( tskIDLE_PRIORITY | portPRIVILEGE_BIT ), but tskIDLE_PRIORITY is zero. */
1993 &xIdleTaskHandle ); /*lint !e961 MISRA exception, justified as it is not a redundant explicit cast to all supported compilers. */
1995 #endif /* configSUPPORT_STATIC_ALLOCATION */
1997 #if ( configUSE_TIMERS == 1 )
1999 if( xReturn == pdPASS )
2001 xReturn = xTimerCreateTimerTask();
2005 mtCOVERAGE_TEST_MARKER();
2008 #endif /* configUSE_TIMERS */
2010 if( xReturn == pdPASS )
2012 /* freertos_tasks_c_additions_init() should only be called if the user
2013 * definable macro FREERTOS_TASKS_C_ADDITIONS_INIT() is defined, as that is
2014 * the only macro called by the function. */
2015 #ifdef FREERTOS_TASKS_C_ADDITIONS_INIT
2017 freertos_tasks_c_additions_init();
2021 /* Interrupts are turned off here, to ensure a tick does not occur
2022 * before or during the call to xPortStartScheduler(). The stacks of
2023 * the created tasks contain a status word with interrupts switched on
2024 * so interrupts will automatically get re-enabled when the first task
2026 portDISABLE_INTERRUPTS();
2028 #if ( ( configUSE_NEWLIB_REENTRANT == 1 ) || ( configUSE_C_RUNTIME_TLS_SUPPORT == 1 ) )
2030 /* Switch C-Runtime's TLS Block to point to the TLS
2031 * block specific to the task that will run first. */
2032 configSET_TLS_BLOCK( pxCurrentTCB->xTLSBlock );
2036 xNextTaskUnblockTime = portMAX_DELAY;
2037 xSchedulerRunning = pdTRUE;
2038 xTickCount = ( TickType_t ) configINITIAL_TICK_COUNT;
2040 /* If configGENERATE_RUN_TIME_STATS is defined then the following
2041 * macro must be defined to configure the timer/counter used to generate
2042 * the run time counter time base. NOTE: If configGENERATE_RUN_TIME_STATS
2043 * is set to 0 and the following line fails to build then ensure you do not
2044 * have portCONFIGURE_TIMER_FOR_RUN_TIME_STATS() defined in your
2045 * FreeRTOSConfig.h file. */
2046 portCONFIGURE_TIMER_FOR_RUN_TIME_STATS();
2048 traceTASK_SWITCHED_IN();
2050 /* Setting up the timer tick is hardware specific and thus in the
2051 * portable interface. */
2052 xPortStartScheduler();
2054 /* In most cases, xPortStartScheduler() will not return. If it
2055 * returns pdTRUE then there was not enough heap memory available
2056 * to create either the Idle or the Timer task. If it returned
2057 * pdFALSE, then the application called xTaskEndScheduler().
2058 * Most ports don't implement xTaskEndScheduler() as there is
2059 * nothing to return to. */
2063 /* This line will only be reached if the kernel could not be started,
2064 * because there was not enough FreeRTOS heap to create the idle task
2065 * or the timer task. */
2066 configASSERT( xReturn != errCOULD_NOT_ALLOCATE_REQUIRED_MEMORY );
2069 /* Prevent compiler warnings if INCLUDE_xTaskGetIdleTaskHandle is set to 0,
2070 * meaning xIdleTaskHandle is not used anywhere else. */
2071 ( void ) xIdleTaskHandle;
2073 /* OpenOCD makes use of uxTopUsedPriority for thread debugging. Prevent uxTopUsedPriority
2074 * from getting optimized out as it is no longer used by the kernel. */
2075 ( void ) uxTopUsedPriority;
2077 /*-----------------------------------------------------------*/
2079 void vTaskEndScheduler( void )
2081 /* Stop the scheduler interrupts and call the portable scheduler end
2082 * routine so the original ISRs can be restored if necessary. The port
2083 * layer must ensure interrupts enable bit is left in the correct state. */
2084 portDISABLE_INTERRUPTS();
2085 xSchedulerRunning = pdFALSE;
2086 vPortEndScheduler();
2088 /*----------------------------------------------------------*/
2090 void vTaskSuspendAll( void )
2092 /* A critical section is not required as the variable is of type
2093 * BaseType_t. Please read Richard Barry's reply in the following link to a
2094 * post in the FreeRTOS support forum before reporting this as a bug! -
2095 * https://goo.gl/wu4acr */
2097 /* portSOFTWARE_BARRIER() is only implemented for emulated/simulated ports that
2098 * do not otherwise exhibit real time behaviour. */
2099 portSOFTWARE_BARRIER();
2101 /* The scheduler is suspended if uxSchedulerSuspended is non-zero. An increment
2102 * is used to allow calls to vTaskSuspendAll() to nest. */
2103 ++uxSchedulerSuspended;
2105 /* Enforces ordering for ports and optimised compilers that may otherwise place
2106 * the above increment elsewhere. */
2107 portMEMORY_BARRIER();
2109 /*----------------------------------------------------------*/
2111 #if ( configUSE_TICKLESS_IDLE != 0 )
2113 static TickType_t prvGetExpectedIdleTime( void )
2116 UBaseType_t uxHigherPriorityReadyTasks = pdFALSE;
2118 /* uxHigherPriorityReadyTasks takes care of the case where
2119 * configUSE_PREEMPTION is 0, so there may be tasks above the idle priority
2120 * task that are in the Ready state, even though the idle task is
2122 #if ( configUSE_PORT_OPTIMISED_TASK_SELECTION == 0 )
2124 if( uxTopReadyPriority > tskIDLE_PRIORITY )
2126 uxHigherPriorityReadyTasks = pdTRUE;
2131 const UBaseType_t uxLeastSignificantBit = ( UBaseType_t ) 0x01;
2133 /* When port optimised task selection is used the uxTopReadyPriority
2134 * variable is used as a bit map. If bits other than the least
2135 * significant bit are set then there are tasks that have a priority
2136 * above the idle priority that are in the Ready state. This takes
2137 * care of the case where the co-operative scheduler is in use. */
2138 if( uxTopReadyPriority > uxLeastSignificantBit )
2140 uxHigherPriorityReadyTasks = pdTRUE;
2143 #endif /* if ( configUSE_PORT_OPTIMISED_TASK_SELECTION == 0 ) */
2145 if( pxCurrentTCB->uxPriority > tskIDLE_PRIORITY )
2149 else if( listCURRENT_LIST_LENGTH( &( pxReadyTasksLists[ tskIDLE_PRIORITY ] ) ) > 1 )
2151 /* There are other idle priority tasks in the ready state. If
2152 * time slicing is used then the very next tick interrupt must be
2156 else if( uxHigherPriorityReadyTasks != pdFALSE )
2158 /* There are tasks in the Ready state that have a priority above the
2159 * idle priority. This path can only be reached if
2160 * configUSE_PREEMPTION is 0. */
2165 xReturn = xNextTaskUnblockTime - xTickCount;
2171 #endif /* configUSE_TICKLESS_IDLE */
2172 /*----------------------------------------------------------*/
2174 BaseType_t xTaskResumeAll( void )
2176 TCB_t * pxTCB = NULL;
2177 BaseType_t xAlreadyYielded = pdFALSE;
2179 /* If uxSchedulerSuspended is zero then this function does not match a
2180 * previous call to vTaskSuspendAll(). */
2181 configASSERT( uxSchedulerSuspended );
2183 /* It is possible that an ISR caused a task to be removed from an event
2184 * list while the scheduler was suspended. If this was the case then the
2185 * removed task will have been added to the xPendingReadyList. Once the
2186 * scheduler has been resumed it is safe to move all the pending ready
2187 * tasks from this list into their appropriate ready list. */
2188 taskENTER_CRITICAL();
2190 --uxSchedulerSuspended;
2192 if( uxSchedulerSuspended == ( UBaseType_t ) pdFALSE )
2194 if( uxCurrentNumberOfTasks > ( UBaseType_t ) 0U )
2196 /* Move any readied tasks from the pending list into the
2197 * appropriate ready list. */
2198 while( listLIST_IS_EMPTY( &xPendingReadyList ) == pdFALSE )
2200 pxTCB = listGET_OWNER_OF_HEAD_ENTRY( ( &xPendingReadyList ) ); /*lint !e9079 void * is used as this macro is used with timers too. Alignment is known to be fine as the type of the pointer stored and retrieved is the same. */
2201 listREMOVE_ITEM( &( pxTCB->xEventListItem ) );
2202 portMEMORY_BARRIER();
2203 listREMOVE_ITEM( &( pxTCB->xStateListItem ) );
2204 prvAddTaskToReadyList( pxTCB );
2206 /* If the moved task has a priority higher than the current
2207 * task then a yield must be performed. */
2208 if( pxTCB->uxPriority > pxCurrentTCB->uxPriority )
2210 xYieldPending = pdTRUE;
2214 mtCOVERAGE_TEST_MARKER();
2220 /* A task was unblocked while the scheduler was suspended,
2221 * which may have prevented the next unblock time from being
2222 * re-calculated, in which case re-calculate it now. Mainly
2223 * important for low power tickless implementations, where
2224 * this can prevent an unnecessary exit from low power
2226 prvResetNextTaskUnblockTime();
2229 /* If any ticks occurred while the scheduler was suspended then
2230 * they should be processed now. This ensures the tick count does
2231 * not slip, and that any delayed tasks are resumed at the correct
2234 TickType_t xPendedCounts = xPendedTicks; /* Non-volatile copy. */
2236 if( xPendedCounts > ( TickType_t ) 0U )
2240 if( xTaskIncrementTick() != pdFALSE )
2242 xYieldPending = pdTRUE;
2246 mtCOVERAGE_TEST_MARKER();
2250 } while( xPendedCounts > ( TickType_t ) 0U );
2256 mtCOVERAGE_TEST_MARKER();
2260 if( xYieldPending != pdFALSE )
2262 #if ( configUSE_PREEMPTION != 0 )
2264 xAlreadyYielded = pdTRUE;
2267 taskYIELD_IF_USING_PREEMPTION();
2271 mtCOVERAGE_TEST_MARKER();
2277 mtCOVERAGE_TEST_MARKER();
2280 taskEXIT_CRITICAL();
2282 return xAlreadyYielded;
2284 /*-----------------------------------------------------------*/
2286 TickType_t xTaskGetTickCount( void )
2290 /* Critical section required if running on a 16 bit processor. */
2291 portTICK_TYPE_ENTER_CRITICAL();
2293 xTicks = xTickCount;
2295 portTICK_TYPE_EXIT_CRITICAL();
2299 /*-----------------------------------------------------------*/
2301 TickType_t xTaskGetTickCountFromISR( void )
2304 UBaseType_t uxSavedInterruptStatus;
2306 /* RTOS ports that support interrupt nesting have the concept of a maximum
2307 * system call (or maximum API call) interrupt priority. Interrupts that are
2308 * above the maximum system call priority are kept permanently enabled, even
2309 * when the RTOS kernel is in a critical section, but cannot make any calls to
2310 * FreeRTOS API functions. If configASSERT() is defined in FreeRTOSConfig.h
2311 * then portASSERT_IF_INTERRUPT_PRIORITY_INVALID() will result in an assertion
2312 * failure if a FreeRTOS API function is called from an interrupt that has been
2313 * assigned a priority above the configured maximum system call priority.
2314 * Only FreeRTOS functions that end in FromISR can be called from interrupts
2315 * that have been assigned a priority at or (logically) below the maximum
2316 * system call interrupt priority. FreeRTOS maintains a separate interrupt
2317 * safe API to ensure interrupt entry is as fast and as simple as possible.
2318 * More information (albeit Cortex-M specific) is provided on the following
2319 * link: https://www.FreeRTOS.org/RTOS-Cortex-M3-M4.html */
2320 portASSERT_IF_INTERRUPT_PRIORITY_INVALID();
2322 uxSavedInterruptStatus = portTICK_TYPE_SET_INTERRUPT_MASK_FROM_ISR();
2324 xReturn = xTickCount;
2326 portTICK_TYPE_CLEAR_INTERRUPT_MASK_FROM_ISR( uxSavedInterruptStatus );
2330 /*-----------------------------------------------------------*/
2332 UBaseType_t uxTaskGetNumberOfTasks( void )
2334 /* A critical section is not required because the variables are of type
2336 return uxCurrentNumberOfTasks;
2338 /*-----------------------------------------------------------*/
2340 char * pcTaskGetName( TaskHandle_t xTaskToQuery ) /*lint !e971 Unqualified char types are allowed for strings and single characters only. */
2344 /* If null is passed in here then the name of the calling task is being
2346 pxTCB = prvGetTCBFromHandle( xTaskToQuery );
2347 configASSERT( pxTCB );
2348 return &( pxTCB->pcTaskName[ 0 ] );
2350 /*-----------------------------------------------------------*/
2352 #if ( INCLUDE_xTaskGetHandle == 1 )
2354 static TCB_t * prvSearchForNameWithinSingleList( List_t * pxList,
2355 const char pcNameToQuery[] )
2359 TCB_t * pxReturn = NULL;
2362 BaseType_t xBreakLoop;
2364 /* This function is called with the scheduler suspended. */
2366 if( listCURRENT_LIST_LENGTH( pxList ) > ( UBaseType_t ) 0 )
2368 listGET_OWNER_OF_NEXT_ENTRY( pxFirstTCB, pxList ); /*lint !e9079 void * is used as this macro is used with timers too. Alignment is known to be fine as the type of the pointer stored and retrieved is the same. */
2372 listGET_OWNER_OF_NEXT_ENTRY( pxNextTCB, pxList ); /*lint !e9079 void * is used as this macro is used with timers too. Alignment is known to be fine as the type of the pointer stored and retrieved is the same. */
2374 /* Check each character in the name looking for a match or
2376 xBreakLoop = pdFALSE;
2378 for( x = ( UBaseType_t ) 0; x < ( UBaseType_t ) configMAX_TASK_NAME_LEN; x++ )
2380 cNextChar = pxNextTCB->pcTaskName[ x ];
2382 if( cNextChar != pcNameToQuery[ x ] )
2384 /* Characters didn't match. */
2385 xBreakLoop = pdTRUE;
2387 else if( cNextChar == ( char ) 0x00 )
2389 /* Both strings terminated, a match must have been
2391 pxReturn = pxNextTCB;
2392 xBreakLoop = pdTRUE;
2396 mtCOVERAGE_TEST_MARKER();
2399 if( xBreakLoop != pdFALSE )
2405 if( pxReturn != NULL )
2407 /* The handle has been found. */
2410 } while( pxNextTCB != pxFirstTCB );
2414 mtCOVERAGE_TEST_MARKER();
2420 #endif /* INCLUDE_xTaskGetHandle */
2421 /*-----------------------------------------------------------*/
2423 #if ( INCLUDE_xTaskGetHandle == 1 )
2425 TaskHandle_t xTaskGetHandle( const char * pcNameToQuery ) /*lint !e971 Unqualified char types are allowed for strings and single characters only. */
2427 UBaseType_t uxQueue = configMAX_PRIORITIES;
2430 /* Task names will be truncated to configMAX_TASK_NAME_LEN - 1 bytes. */
2431 configASSERT( strlen( pcNameToQuery ) < configMAX_TASK_NAME_LEN );
2435 /* Search the ready lists. */
2439 pxTCB = prvSearchForNameWithinSingleList( ( List_t * ) &( pxReadyTasksLists[ uxQueue ] ), pcNameToQuery );
2443 /* Found the handle. */
2446 } while( uxQueue > ( UBaseType_t ) tskIDLE_PRIORITY ); /*lint !e961 MISRA exception as the casts are only redundant for some ports. */
2448 /* Search the delayed lists. */
2451 pxTCB = prvSearchForNameWithinSingleList( ( List_t * ) pxDelayedTaskList, pcNameToQuery );
2456 pxTCB = prvSearchForNameWithinSingleList( ( List_t * ) pxOverflowDelayedTaskList, pcNameToQuery );
2459 #if ( INCLUDE_vTaskSuspend == 1 )
2463 /* Search the suspended list. */
2464 pxTCB = prvSearchForNameWithinSingleList( &xSuspendedTaskList, pcNameToQuery );
2469 #if ( INCLUDE_vTaskDelete == 1 )
2473 /* Search the deleted list. */
2474 pxTCB = prvSearchForNameWithinSingleList( &xTasksWaitingTermination, pcNameToQuery );
2479 ( void ) xTaskResumeAll();
2484 #endif /* INCLUDE_xTaskGetHandle */
2485 /*-----------------------------------------------------------*/
2487 #if ( configUSE_TRACE_FACILITY == 1 )
2489 UBaseType_t uxTaskGetSystemState( TaskStatus_t * const pxTaskStatusArray,
2490 const UBaseType_t uxArraySize,
2491 configRUN_TIME_COUNTER_TYPE * const pulTotalRunTime )
2493 UBaseType_t uxTask = 0, uxQueue = configMAX_PRIORITIES;
2497 /* Is there a space in the array for each task in the system? */
2498 if( uxArraySize >= uxCurrentNumberOfTasks )
2500 /* Fill in an TaskStatus_t structure with information on each
2501 * task in the Ready state. */
2505 uxTask += prvListTasksWithinSingleList( &( pxTaskStatusArray[ uxTask ] ), &( pxReadyTasksLists[ uxQueue ] ), eReady );
2506 } while( uxQueue > ( UBaseType_t ) tskIDLE_PRIORITY ); /*lint !e961 MISRA exception as the casts are only redundant for some ports. */
2508 /* Fill in an TaskStatus_t structure with information on each
2509 * task in the Blocked state. */
2510 uxTask += prvListTasksWithinSingleList( &( pxTaskStatusArray[ uxTask ] ), ( List_t * ) pxDelayedTaskList, eBlocked );
2511 uxTask += prvListTasksWithinSingleList( &( pxTaskStatusArray[ uxTask ] ), ( List_t * ) pxOverflowDelayedTaskList, eBlocked );
2513 #if ( INCLUDE_vTaskDelete == 1 )
2515 /* Fill in an TaskStatus_t structure with information on
2516 * each task that has been deleted but not yet cleaned up. */
2517 uxTask += prvListTasksWithinSingleList( &( pxTaskStatusArray[ uxTask ] ), &xTasksWaitingTermination, eDeleted );
2521 #if ( INCLUDE_vTaskSuspend == 1 )
2523 /* Fill in an TaskStatus_t structure with information on
2524 * each task in the Suspended state. */
2525 uxTask += prvListTasksWithinSingleList( &( pxTaskStatusArray[ uxTask ] ), &xSuspendedTaskList, eSuspended );
2529 #if ( configGENERATE_RUN_TIME_STATS == 1 )
2531 if( pulTotalRunTime != NULL )
2533 #ifdef portALT_GET_RUN_TIME_COUNTER_VALUE
2534 portALT_GET_RUN_TIME_COUNTER_VALUE( ( *pulTotalRunTime ) );
2536 *pulTotalRunTime = portGET_RUN_TIME_COUNTER_VALUE();
2540 #else /* if ( configGENERATE_RUN_TIME_STATS == 1 ) */
2542 if( pulTotalRunTime != NULL )
2544 *pulTotalRunTime = 0;
2547 #endif /* if ( configGENERATE_RUN_TIME_STATS == 1 ) */
2551 mtCOVERAGE_TEST_MARKER();
2554 ( void ) xTaskResumeAll();
2559 #endif /* configUSE_TRACE_FACILITY */
2560 /*----------------------------------------------------------*/
2562 #if ( INCLUDE_xTaskGetIdleTaskHandle == 1 )
2564 TaskHandle_t xTaskGetIdleTaskHandle( void )
2566 /* If xTaskGetIdleTaskHandle() is called before the scheduler has been
2567 * started, then xIdleTaskHandle will be NULL. */
2568 configASSERT( ( xIdleTaskHandle != NULL ) );
2569 return xIdleTaskHandle;
2572 #endif /* INCLUDE_xTaskGetIdleTaskHandle */
2573 /*----------------------------------------------------------*/
2575 /* This conditional compilation should use inequality to 0, not equality to 1.
2576 * This is to ensure vTaskStepTick() is available when user defined low power mode
2577 * implementations require configUSE_TICKLESS_IDLE to be set to a value other than
2579 #if ( configUSE_TICKLESS_IDLE != 0 )
2581 void vTaskStepTick( TickType_t xTicksToJump )
2583 /* Correct the tick count value after a period during which the tick
2584 * was suppressed. Note this does *not* call the tick hook function for
2585 * each stepped tick. */
2586 configASSERT( ( xTickCount + xTicksToJump ) <= xNextTaskUnblockTime );
2588 if( ( xTickCount + xTicksToJump ) == xNextTaskUnblockTime )
2590 /* Arrange for xTickCount to reach xNextTaskUnblockTime in
2591 * xTaskIncrementTick() when the scheduler resumes. This ensures
2592 * that any delayed tasks are resumed at the correct time. */
2593 configASSERT( uxSchedulerSuspended );
2594 configASSERT( xTicksToJump != ( TickType_t ) 0 );
2596 /* Prevent the tick interrupt modifying xPendedTicks simultaneously. */
2597 taskENTER_CRITICAL();
2601 taskEXIT_CRITICAL();
2606 mtCOVERAGE_TEST_MARKER();
2609 xTickCount += xTicksToJump;
2610 traceINCREASE_TICK_COUNT( xTicksToJump );
2613 #endif /* configUSE_TICKLESS_IDLE */
2614 /*----------------------------------------------------------*/
2616 BaseType_t xTaskCatchUpTicks( TickType_t xTicksToCatchUp )
2618 BaseType_t xYieldOccurred;
2620 /* Must not be called with the scheduler suspended as the implementation
2621 * relies on xPendedTicks being wound down to 0 in xTaskResumeAll(). */
2622 configASSERT( uxSchedulerSuspended == 0 );
2624 /* Use xPendedTicks to mimic xTicksToCatchUp number of ticks occurring when
2625 * the scheduler is suspended so the ticks are executed in xTaskResumeAll(). */
2628 /* Prevent the tick interrupt modifying xPendedTicks simultaneously. */
2629 taskENTER_CRITICAL();
2631 xPendedTicks += xTicksToCatchUp;
2633 taskEXIT_CRITICAL();
2634 xYieldOccurred = xTaskResumeAll();
2636 return xYieldOccurred;
2638 /*----------------------------------------------------------*/
2640 #if ( INCLUDE_xTaskAbortDelay == 1 )
2642 BaseType_t xTaskAbortDelay( TaskHandle_t xTask )
2644 TCB_t * pxTCB = xTask;
2647 configASSERT( pxTCB );
2651 /* A task can only be prematurely removed from the Blocked state if
2652 * it is actually in the Blocked state. */
2653 if( eTaskGetState( xTask ) == eBlocked )
2657 /* Remove the reference to the task from the blocked list. An
2658 * interrupt won't touch the xStateListItem because the
2659 * scheduler is suspended. */
2660 ( void ) uxListRemove( &( pxTCB->xStateListItem ) );
2662 /* Is the task waiting on an event also? If so remove it from
2663 * the event list too. Interrupts can touch the event list item,
2664 * even though the scheduler is suspended, so a critical section
2666 taskENTER_CRITICAL();
2668 if( listLIST_ITEM_CONTAINER( &( pxTCB->xEventListItem ) ) != NULL )
2670 ( void ) uxListRemove( &( pxTCB->xEventListItem ) );
2672 /* This lets the task know it was forcibly removed from the
2673 * blocked state so it should not re-evaluate its block time and
2674 * then block again. */
2675 pxTCB->ucDelayAborted = pdTRUE;
2679 mtCOVERAGE_TEST_MARKER();
2682 taskEXIT_CRITICAL();
2684 /* Place the unblocked task into the appropriate ready list. */
2685 prvAddTaskToReadyList( pxTCB );
2687 /* A task being unblocked cannot cause an immediate context
2688 * switch if preemption is turned off. */
2689 #if ( configUSE_PREEMPTION == 1 )
2691 /* Preemption is on, but a context switch should only be
2692 * performed if the unblocked task has a priority that is
2693 * higher than the currently executing task. */
2694 if( pxTCB->uxPriority > pxCurrentTCB->uxPriority )
2696 /* Pend the yield to be performed when the scheduler
2697 * is unsuspended. */
2698 xYieldPending = pdTRUE;
2702 mtCOVERAGE_TEST_MARKER();
2705 #endif /* configUSE_PREEMPTION */
2712 ( void ) xTaskResumeAll();
2717 #endif /* INCLUDE_xTaskAbortDelay */
2718 /*----------------------------------------------------------*/
2720 BaseType_t xTaskIncrementTick( void )
2723 TickType_t xItemValue;
2724 BaseType_t xSwitchRequired = pdFALSE;
2726 /* Called by the portable layer each time a tick interrupt occurs.
2727 * Increments the tick then checks to see if the new tick value will cause any
2728 * tasks to be unblocked. */
2729 traceTASK_INCREMENT_TICK( xTickCount );
2731 if( uxSchedulerSuspended == ( UBaseType_t ) pdFALSE )
2733 /* Minor optimisation. The tick count cannot change in this
2735 const TickType_t xConstTickCount = xTickCount + ( TickType_t ) 1;
2737 /* Increment the RTOS tick, switching the delayed and overflowed
2738 * delayed lists if it wraps to 0. */
2739 xTickCount = xConstTickCount;
2741 if( xConstTickCount == ( TickType_t ) 0U ) /*lint !e774 'if' does not always evaluate to false as it is looking for an overflow. */
2743 taskSWITCH_DELAYED_LISTS();
2747 mtCOVERAGE_TEST_MARKER();
2750 /* See if this tick has made a timeout expire. Tasks are stored in
2751 * the queue in the order of their wake time - meaning once one task
2752 * has been found whose block time has not expired there is no need to
2753 * look any further down the list. */
2754 if( xConstTickCount >= xNextTaskUnblockTime )
2758 if( listLIST_IS_EMPTY( pxDelayedTaskList ) != pdFALSE )
2760 /* The delayed list is empty. Set xNextTaskUnblockTime
2761 * to the maximum possible value so it is extremely
2763 * if( xTickCount >= xNextTaskUnblockTime ) test will pass
2764 * next time through. */
2765 xNextTaskUnblockTime = portMAX_DELAY; /*lint !e961 MISRA exception as the casts are only redundant for some ports. */
2770 /* The delayed list is not empty, get the value of the
2771 * item at the head of the delayed list. This is the time
2772 * at which the task at the head of the delayed list must
2773 * be removed from the Blocked state. */
2774 pxTCB = listGET_OWNER_OF_HEAD_ENTRY( pxDelayedTaskList ); /*lint !e9079 void * is used as this macro is used with timers too. Alignment is known to be fine as the type of the pointer stored and retrieved is the same. */
2775 xItemValue = listGET_LIST_ITEM_VALUE( &( pxTCB->xStateListItem ) );
2777 if( xConstTickCount < xItemValue )
2779 /* It is not time to unblock this item yet, but the
2780 * item value is the time at which the task at the head
2781 * of the blocked list must be removed from the Blocked
2782 * state - so record the item value in
2783 * xNextTaskUnblockTime. */
2784 xNextTaskUnblockTime = xItemValue;
2785 break; /*lint !e9011 Code structure here is deemed easier to understand with multiple breaks. */
2789 mtCOVERAGE_TEST_MARKER();
2792 /* It is time to remove the item from the Blocked state. */
2793 listREMOVE_ITEM( &( pxTCB->xStateListItem ) );
2795 /* Is the task waiting on an event also? If so remove
2796 * it from the event list. */
2797 if( listLIST_ITEM_CONTAINER( &( pxTCB->xEventListItem ) ) != NULL )
2799 listREMOVE_ITEM( &( pxTCB->xEventListItem ) );
2803 mtCOVERAGE_TEST_MARKER();
2806 /* Place the unblocked task into the appropriate ready
2808 prvAddTaskToReadyList( pxTCB );
2810 /* A task being unblocked cannot cause an immediate
2811 * context switch if preemption is turned off. */
2812 #if ( configUSE_PREEMPTION == 1 )
2814 /* Preemption is on, but a context switch should
2815 * only be performed if the unblocked task's
2816 * priority is higher than the currently executing
2818 * The case of equal priority tasks sharing
2819 * processing time (which happens when both
2820 * preemption and time slicing are on) is
2822 if( pxTCB->uxPriority > pxCurrentTCB->uxPriority )
2824 xSwitchRequired = pdTRUE;
2828 mtCOVERAGE_TEST_MARKER();
2831 #endif /* configUSE_PREEMPTION */
2836 /* Tasks of equal priority to the currently running task will share
2837 * processing time (time slice) if preemption is on, and the application
2838 * writer has not explicitly turned time slicing off. */
2839 #if ( ( configUSE_PREEMPTION == 1 ) && ( configUSE_TIME_SLICING == 1 ) )
2841 if( listCURRENT_LIST_LENGTH( &( pxReadyTasksLists[ pxCurrentTCB->uxPriority ] ) ) > ( UBaseType_t ) 1 )
2843 xSwitchRequired = pdTRUE;
2847 mtCOVERAGE_TEST_MARKER();
2850 #endif /* ( ( configUSE_PREEMPTION == 1 ) && ( configUSE_TIME_SLICING == 1 ) ) */
2852 #if ( configUSE_TICK_HOOK == 1 )
2854 /* Guard against the tick hook being called when the pended tick
2855 * count is being unwound (when the scheduler is being unlocked). */
2856 if( xPendedTicks == ( TickType_t ) 0 )
2858 vApplicationTickHook();
2862 mtCOVERAGE_TEST_MARKER();
2865 #endif /* configUSE_TICK_HOOK */
2867 #if ( configUSE_PREEMPTION == 1 )
2869 if( xYieldPending != pdFALSE )
2871 xSwitchRequired = pdTRUE;
2875 mtCOVERAGE_TEST_MARKER();
2878 #endif /* configUSE_PREEMPTION */
2884 /* The tick hook gets called at regular intervals, even if the
2885 * scheduler is locked. */
2886 #if ( configUSE_TICK_HOOK == 1 )
2888 vApplicationTickHook();
2893 return xSwitchRequired;
2895 /*-----------------------------------------------------------*/
2897 #if ( configUSE_APPLICATION_TASK_TAG == 1 )
2899 void vTaskSetApplicationTaskTag( TaskHandle_t xTask,
2900 TaskHookFunction_t pxHookFunction )
2904 /* If xTask is NULL then it is the task hook of the calling task that is
2908 xTCB = ( TCB_t * ) pxCurrentTCB;
2915 /* Save the hook function in the TCB. A critical section is required as
2916 * the value can be accessed from an interrupt. */
2917 taskENTER_CRITICAL();
2919 xTCB->pxTaskTag = pxHookFunction;
2921 taskEXIT_CRITICAL();
2924 #endif /* configUSE_APPLICATION_TASK_TAG */
2925 /*-----------------------------------------------------------*/
2927 #if ( configUSE_APPLICATION_TASK_TAG == 1 )
2929 TaskHookFunction_t xTaskGetApplicationTaskTag( TaskHandle_t xTask )
2932 TaskHookFunction_t xReturn;
2934 /* If xTask is NULL then set the calling task's hook. */
2935 pxTCB = prvGetTCBFromHandle( xTask );
2937 /* Save the hook function in the TCB. A critical section is required as
2938 * the value can be accessed from an interrupt. */
2939 taskENTER_CRITICAL();
2941 xReturn = pxTCB->pxTaskTag;
2943 taskEXIT_CRITICAL();
2948 #endif /* configUSE_APPLICATION_TASK_TAG */
2949 /*-----------------------------------------------------------*/
2951 #if ( configUSE_APPLICATION_TASK_TAG == 1 )
2953 TaskHookFunction_t xTaskGetApplicationTaskTagFromISR( TaskHandle_t xTask )
2956 TaskHookFunction_t xReturn;
2957 UBaseType_t uxSavedInterruptStatus;
2959 /* If xTask is NULL then set the calling task's hook. */
2960 pxTCB = prvGetTCBFromHandle( xTask );
2962 /* Save the hook function in the TCB. A critical section is required as
2963 * the value can be accessed from an interrupt. */
2964 uxSavedInterruptStatus = portSET_INTERRUPT_MASK_FROM_ISR();
2966 xReturn = pxTCB->pxTaskTag;
2968 portCLEAR_INTERRUPT_MASK_FROM_ISR( uxSavedInterruptStatus );
2973 #endif /* configUSE_APPLICATION_TASK_TAG */
2974 /*-----------------------------------------------------------*/
2976 #if ( configUSE_APPLICATION_TASK_TAG == 1 )
2978 BaseType_t xTaskCallApplicationTaskHook( TaskHandle_t xTask,
2979 void * pvParameter )
2984 /* If xTask is NULL then we are calling our own task hook. */
2987 xTCB = pxCurrentTCB;
2994 if( xTCB->pxTaskTag != NULL )
2996 xReturn = xTCB->pxTaskTag( pvParameter );
3006 #endif /* configUSE_APPLICATION_TASK_TAG */
3007 /*-----------------------------------------------------------*/
3009 void vTaskSwitchContext( void )
3011 if( uxSchedulerSuspended != ( UBaseType_t ) pdFALSE )
3013 /* The scheduler is currently suspended - do not allow a context
3015 xYieldPending = pdTRUE;
3019 xYieldPending = pdFALSE;
3020 traceTASK_SWITCHED_OUT();
3022 #if ( configGENERATE_RUN_TIME_STATS == 1 )
3024 #ifdef portALT_GET_RUN_TIME_COUNTER_VALUE
3025 portALT_GET_RUN_TIME_COUNTER_VALUE( ulTotalRunTime );
3027 ulTotalRunTime = portGET_RUN_TIME_COUNTER_VALUE();
3030 /* Add the amount of time the task has been running to the
3031 * accumulated time so far. The time the task started running was
3032 * stored in ulTaskSwitchedInTime. Note that there is no overflow
3033 * protection here so count values are only valid until the timer
3034 * overflows. The guard against negative values is to protect
3035 * against suspect run time stat counter implementations - which
3036 * are provided by the application, not the kernel. */
3037 if( ulTotalRunTime > ulTaskSwitchedInTime )
3039 pxCurrentTCB->ulRunTimeCounter += ( ulTotalRunTime - ulTaskSwitchedInTime );
3043 mtCOVERAGE_TEST_MARKER();
3046 ulTaskSwitchedInTime = ulTotalRunTime;
3048 #endif /* configGENERATE_RUN_TIME_STATS */
3050 /* Check for stack overflow, if configured. */
3051 taskCHECK_FOR_STACK_OVERFLOW();
3053 /* Before the currently running task is switched out, save its errno. */
3054 #if ( configUSE_POSIX_ERRNO == 1 )
3056 pxCurrentTCB->iTaskErrno = FreeRTOS_errno;
3060 /* Select a new task to run using either the generic C or port
3061 * optimised asm code. */
3062 taskSELECT_HIGHEST_PRIORITY_TASK(); /*lint !e9079 void * is used as this macro is used with timers too. Alignment is known to be fine as the type of the pointer stored and retrieved is the same. */
3063 traceTASK_SWITCHED_IN();
3065 /* After the new task is switched in, update the global errno. */
3066 #if ( configUSE_POSIX_ERRNO == 1 )
3068 FreeRTOS_errno = pxCurrentTCB->iTaskErrno;
3072 #if ( ( configUSE_NEWLIB_REENTRANT == 1 ) || ( configUSE_C_RUNTIME_TLS_SUPPORT == 1 ) )
3074 /* Switch C-Runtime's TLS Block to point to the TLS
3075 * Block specific to this task. */
3076 configSET_TLS_BLOCK( pxCurrentTCB->xTLSBlock );
3081 /*-----------------------------------------------------------*/
3083 void vTaskPlaceOnEventList( List_t * const pxEventList,
3084 const TickType_t xTicksToWait )
3086 configASSERT( pxEventList );
3088 /* THIS FUNCTION MUST BE CALLED WITH EITHER INTERRUPTS DISABLED OR THE
3089 * SCHEDULER SUSPENDED AND THE QUEUE BEING ACCESSED LOCKED. */
3091 /* Place the event list item of the TCB in the appropriate event list.
3092 * This is placed in the list in priority order so the highest priority task
3093 * is the first to be woken by the event.
3095 * Note: Lists are sorted in ascending order by ListItem_t.xItemValue.
3096 * Normally, the xItemValue of a TCB's ListItem_t members is:
3097 * xItemValue = ( configMAX_PRIORITIES - uxPriority )
3098 * Therefore, the event list is sorted in descending priority order.
3100 * The queue that contains the event list is locked, preventing
3101 * simultaneous access from interrupts. */
3102 vListInsert( pxEventList, &( pxCurrentTCB->xEventListItem ) );
3104 prvAddCurrentTaskToDelayedList( xTicksToWait, pdTRUE );
3106 /*-----------------------------------------------------------*/
3108 void vTaskPlaceOnUnorderedEventList( List_t * pxEventList,
3109 const TickType_t xItemValue,
3110 const TickType_t xTicksToWait )
3112 configASSERT( pxEventList );
3114 /* THIS FUNCTION MUST BE CALLED WITH THE SCHEDULER SUSPENDED. It is used by
3115 * the event groups implementation. */
3116 configASSERT( uxSchedulerSuspended != 0 );
3118 /* Store the item value in the event list item. It is safe to access the
3119 * event list item here as interrupts won't access the event list item of a
3120 * task that is not in the Blocked state. */
3121 listSET_LIST_ITEM_VALUE( &( pxCurrentTCB->xEventListItem ), xItemValue | taskEVENT_LIST_ITEM_VALUE_IN_USE );
3123 /* Place the event list item of the TCB at the end of the appropriate event
3124 * list. It is safe to access the event list here because it is part of an
3125 * event group implementation - and interrupts don't access event groups
3126 * directly (instead they access them indirectly by pending function calls to
3127 * the task level). */
3128 listINSERT_END( pxEventList, &( pxCurrentTCB->xEventListItem ) );
3130 prvAddCurrentTaskToDelayedList( xTicksToWait, pdTRUE );
3132 /*-----------------------------------------------------------*/
3134 #if ( configUSE_TIMERS == 1 )
3136 void vTaskPlaceOnEventListRestricted( List_t * const pxEventList,
3137 TickType_t xTicksToWait,
3138 const BaseType_t xWaitIndefinitely )
3140 configASSERT( pxEventList );
3142 /* This function should not be called by application code hence the
3143 * 'Restricted' in its name. It is not part of the public API. It is
3144 * designed for use by kernel code, and has special calling requirements -
3145 * it should be called with the scheduler suspended. */
3148 /* Place the event list item of the TCB in the appropriate event list.
3149 * In this case it is assume that this is the only task that is going to
3150 * be waiting on this event list, so the faster vListInsertEnd() function
3151 * can be used in place of vListInsert. */
3152 listINSERT_END( pxEventList, &( pxCurrentTCB->xEventListItem ) );
3154 /* If the task should block indefinitely then set the block time to a
3155 * value that will be recognised as an indefinite delay inside the
3156 * prvAddCurrentTaskToDelayedList() function. */
3157 if( xWaitIndefinitely != pdFALSE )
3159 xTicksToWait = portMAX_DELAY;
3162 traceTASK_DELAY_UNTIL( ( xTickCount + xTicksToWait ) );
3163 prvAddCurrentTaskToDelayedList( xTicksToWait, xWaitIndefinitely );
3166 #endif /* configUSE_TIMERS */
3167 /*-----------------------------------------------------------*/
3169 BaseType_t xTaskRemoveFromEventList( const List_t * const pxEventList )
3171 TCB_t * pxUnblockedTCB;
3174 /* THIS FUNCTION MUST BE CALLED FROM A CRITICAL SECTION. It can also be
3175 * called from a critical section within an ISR. */
3177 /* The event list is sorted in priority order, so the first in the list can
3178 * be removed as it is known to be the highest priority. Remove the TCB from
3179 * the delayed list, and add it to the ready list.
3181 * If an event is for a queue that is locked then this function will never
3182 * get called - the lock count on the queue will get modified instead. This
3183 * means exclusive access to the event list is guaranteed here.
3185 * This function assumes that a check has already been made to ensure that
3186 * pxEventList is not empty. */
3187 pxUnblockedTCB = listGET_OWNER_OF_HEAD_ENTRY( pxEventList ); /*lint !e9079 void * is used as this macro is used with timers too. Alignment is known to be fine as the type of the pointer stored and retrieved is the same. */
3188 configASSERT( pxUnblockedTCB );
3189 listREMOVE_ITEM( &( pxUnblockedTCB->xEventListItem ) );
3191 if( uxSchedulerSuspended == ( UBaseType_t ) pdFALSE )
3193 listREMOVE_ITEM( &( pxUnblockedTCB->xStateListItem ) );
3194 prvAddTaskToReadyList( pxUnblockedTCB );
3196 #if ( configUSE_TICKLESS_IDLE != 0 )
3198 /* If a task is blocked on a kernel object then xNextTaskUnblockTime
3199 * might be set to the blocked task's time out time. If the task is
3200 * unblocked for a reason other than a timeout xNextTaskUnblockTime is
3201 * normally left unchanged, because it is automatically reset to a new
3202 * value when the tick count equals xNextTaskUnblockTime. However if
3203 * tickless idling is used it might be more important to enter sleep mode
3204 * at the earliest possible time - so reset xNextTaskUnblockTime here to
3205 * ensure it is updated at the earliest possible time. */
3206 prvResetNextTaskUnblockTime();
3212 /* The delayed and ready lists cannot be accessed, so hold this task
3213 * pending until the scheduler is resumed. */
3214 listINSERT_END( &( xPendingReadyList ), &( pxUnblockedTCB->xEventListItem ) );
3217 if( pxUnblockedTCB->uxPriority > pxCurrentTCB->uxPriority )
3219 /* Return true if the task removed from the event list has a higher
3220 * priority than the calling task. This allows the calling task to know if
3221 * it should force a context switch now. */
3224 /* Mark that a yield is pending in case the user is not using the
3225 * "xHigherPriorityTaskWoken" parameter to an ISR safe FreeRTOS function. */
3226 xYieldPending = pdTRUE;
3235 /*-----------------------------------------------------------*/
3237 void vTaskRemoveFromUnorderedEventList( ListItem_t * pxEventListItem,
3238 const TickType_t xItemValue )
3240 TCB_t * pxUnblockedTCB;
3242 /* THIS FUNCTION MUST BE CALLED WITH THE SCHEDULER SUSPENDED. It is used by
3243 * the event flags implementation. */
3244 configASSERT( uxSchedulerSuspended != pdFALSE );
3246 /* Store the new item value in the event list. */
3247 listSET_LIST_ITEM_VALUE( pxEventListItem, xItemValue | taskEVENT_LIST_ITEM_VALUE_IN_USE );
3249 /* Remove the event list form the event flag. Interrupts do not access
3251 pxUnblockedTCB = listGET_LIST_ITEM_OWNER( pxEventListItem ); /*lint !e9079 void * is used as this macro is used with timers too. Alignment is known to be fine as the type of the pointer stored and retrieved is the same. */
3252 configASSERT( pxUnblockedTCB );
3253 listREMOVE_ITEM( pxEventListItem );
3255 #if ( configUSE_TICKLESS_IDLE != 0 )
3257 /* If a task is blocked on a kernel object then xNextTaskUnblockTime
3258 * might be set to the blocked task's time out time. If the task is
3259 * unblocked for a reason other than a timeout xNextTaskUnblockTime is
3260 * normally left unchanged, because it is automatically reset to a new
3261 * value when the tick count equals xNextTaskUnblockTime. However if
3262 * tickless idling is used it might be more important to enter sleep mode
3263 * at the earliest possible time - so reset xNextTaskUnblockTime here to
3264 * ensure it is updated at the earliest possible time. */
3265 prvResetNextTaskUnblockTime();
3269 /* Remove the task from the delayed list and add it to the ready list. The
3270 * scheduler is suspended so interrupts will not be accessing the ready
3272 listREMOVE_ITEM( &( pxUnblockedTCB->xStateListItem ) );
3273 prvAddTaskToReadyList( pxUnblockedTCB );
3275 if( pxUnblockedTCB->uxPriority > pxCurrentTCB->uxPriority )
3277 /* The unblocked task has a priority above that of the calling task, so
3278 * a context switch is required. This function is called with the
3279 * scheduler suspended so xYieldPending is set so the context switch
3280 * occurs immediately that the scheduler is resumed (unsuspended). */
3281 xYieldPending = pdTRUE;
3284 /*-----------------------------------------------------------*/
3286 void vTaskSetTimeOutState( TimeOut_t * const pxTimeOut )
3288 configASSERT( pxTimeOut );
3289 taskENTER_CRITICAL();
3291 pxTimeOut->xOverflowCount = xNumOfOverflows;
3292 pxTimeOut->xTimeOnEntering = xTickCount;
3294 taskEXIT_CRITICAL();
3296 /*-----------------------------------------------------------*/
3298 void vTaskInternalSetTimeOutState( TimeOut_t * const pxTimeOut )
3300 /* For internal use only as it does not use a critical section. */
3301 pxTimeOut->xOverflowCount = xNumOfOverflows;
3302 pxTimeOut->xTimeOnEntering = xTickCount;
3304 /*-----------------------------------------------------------*/
3306 BaseType_t xTaskCheckForTimeOut( TimeOut_t * const pxTimeOut,
3307 TickType_t * const pxTicksToWait )
3311 configASSERT( pxTimeOut );
3312 configASSERT( pxTicksToWait );
3314 taskENTER_CRITICAL();
3316 /* Minor optimisation. The tick count cannot change in this block. */
3317 const TickType_t xConstTickCount = xTickCount;
3318 const TickType_t xElapsedTime = xConstTickCount - pxTimeOut->xTimeOnEntering;
3320 #if ( INCLUDE_xTaskAbortDelay == 1 )
3321 if( pxCurrentTCB->ucDelayAborted != ( uint8_t ) pdFALSE )
3323 /* The delay was aborted, which is not the same as a time out,
3324 * but has the same result. */
3325 pxCurrentTCB->ucDelayAborted = pdFALSE;
3331 #if ( INCLUDE_vTaskSuspend == 1 )
3332 if( *pxTicksToWait == portMAX_DELAY )
3334 /* If INCLUDE_vTaskSuspend is set to 1 and the block time
3335 * specified is the maximum block time then the task should block
3336 * indefinitely, and therefore never time out. */
3342 if( ( xNumOfOverflows != pxTimeOut->xOverflowCount ) && ( xConstTickCount >= pxTimeOut->xTimeOnEntering ) ) /*lint !e525 Indentation preferred as is to make code within pre-processor directives clearer. */
3344 /* The tick count is greater than the time at which
3345 * vTaskSetTimeout() was called, but has also overflowed since
3346 * vTaskSetTimeOut() was called. It must have wrapped all the way
3347 * around and gone past again. This passed since vTaskSetTimeout()
3350 *pxTicksToWait = ( TickType_t ) 0;
3352 else if( xElapsedTime < *pxTicksToWait ) /*lint !e961 Explicit casting is only redundant with some compilers, whereas others require it to prevent integer conversion errors. */
3354 /* Not a genuine timeout. Adjust parameters for time remaining. */
3355 *pxTicksToWait -= xElapsedTime;
3356 vTaskInternalSetTimeOutState( pxTimeOut );
3361 *pxTicksToWait = ( TickType_t ) 0;
3365 taskEXIT_CRITICAL();
3369 /*-----------------------------------------------------------*/
3371 void vTaskMissedYield( void )
3373 xYieldPending = pdTRUE;
3375 /*-----------------------------------------------------------*/
3377 #if ( configUSE_TRACE_FACILITY == 1 )
3379 UBaseType_t uxTaskGetTaskNumber( TaskHandle_t xTask )
3381 UBaseType_t uxReturn;
3382 TCB_t const * pxTCB;
3387 uxReturn = pxTCB->uxTaskNumber;
3397 #endif /* configUSE_TRACE_FACILITY */
3398 /*-----------------------------------------------------------*/
3400 #if ( configUSE_TRACE_FACILITY == 1 )
3402 void vTaskSetTaskNumber( TaskHandle_t xTask,
3403 const UBaseType_t uxHandle )
3410 pxTCB->uxTaskNumber = uxHandle;
3414 #endif /* configUSE_TRACE_FACILITY */
3417 * -----------------------------------------------------------
3419 * ----------------------------------------------------------
3421 * The portTASK_FUNCTION() macro is used to allow port/compiler specific
3422 * language extensions. The equivalent prototype for this function is:
3424 * void prvIdleTask( void *pvParameters );
3427 static portTASK_FUNCTION( prvIdleTask, pvParameters )
3429 /* Stop warnings. */
3430 ( void ) pvParameters;
3432 /** THIS IS THE RTOS IDLE TASK - WHICH IS CREATED AUTOMATICALLY WHEN THE
3433 * SCHEDULER IS STARTED. **/
3435 /* In case a task that has a secure context deletes itself, in which case
3436 * the idle task is responsible for deleting the task's secure context, if
3438 portALLOCATE_SECURE_CONTEXT( configMINIMAL_SECURE_STACK_SIZE );
3442 /* See if any tasks have deleted themselves - if so then the idle task
3443 * is responsible for freeing the deleted task's TCB and stack. */
3444 prvCheckTasksWaitingTermination();
3446 #if ( configUSE_PREEMPTION == 0 )
3448 /* If we are not using preemption we keep forcing a task switch to
3449 * see if any other task has become available. If we are using
3450 * preemption we don't need to do this as any task becoming available
3451 * will automatically get the processor anyway. */
3454 #endif /* configUSE_PREEMPTION */
3456 #if ( ( configUSE_PREEMPTION == 1 ) && ( configIDLE_SHOULD_YIELD == 1 ) )
3458 /* When using preemption tasks of equal priority will be
3459 * timesliced. If a task that is sharing the idle priority is ready
3460 * to run then the idle task should yield before the end of the
3463 * A critical region is not required here as we are just reading from
3464 * the list, and an occasional incorrect value will not matter. If
3465 * the ready list at the idle priority contains more than one task
3466 * then a task other than the idle task is ready to execute. */
3467 if( listCURRENT_LIST_LENGTH( &( pxReadyTasksLists[ tskIDLE_PRIORITY ] ) ) > ( UBaseType_t ) 1 )
3473 mtCOVERAGE_TEST_MARKER();
3476 #endif /* ( ( configUSE_PREEMPTION == 1 ) && ( configIDLE_SHOULD_YIELD == 1 ) ) */
3478 #if ( configUSE_IDLE_HOOK == 1 )
3480 /* Call the user defined function from within the idle task. */
3481 vApplicationIdleHook();
3483 #endif /* configUSE_IDLE_HOOK */
3485 /* This conditional compilation should use inequality to 0, not equality
3486 * to 1. This is to ensure portSUPPRESS_TICKS_AND_SLEEP() is called when
3487 * user defined low power mode implementations require
3488 * configUSE_TICKLESS_IDLE to be set to a value other than 1. */
3489 #if ( configUSE_TICKLESS_IDLE != 0 )
3491 TickType_t xExpectedIdleTime;
3493 /* It is not desirable to suspend then resume the scheduler on
3494 * each iteration of the idle task. Therefore, a preliminary
3495 * test of the expected idle time is performed without the
3496 * scheduler suspended. The result here is not necessarily
3498 xExpectedIdleTime = prvGetExpectedIdleTime();
3500 if( xExpectedIdleTime >= configEXPECTED_IDLE_TIME_BEFORE_SLEEP )
3504 /* Now the scheduler is suspended, the expected idle
3505 * time can be sampled again, and this time its value can
3507 configASSERT( xNextTaskUnblockTime >= xTickCount );
3508 xExpectedIdleTime = prvGetExpectedIdleTime();
3510 /* Define the following macro to set xExpectedIdleTime to 0
3511 * if the application does not want
3512 * portSUPPRESS_TICKS_AND_SLEEP() to be called. */
3513 configPRE_SUPPRESS_TICKS_AND_SLEEP_PROCESSING( xExpectedIdleTime );
3515 if( xExpectedIdleTime >= configEXPECTED_IDLE_TIME_BEFORE_SLEEP )
3517 traceLOW_POWER_IDLE_BEGIN();
3518 portSUPPRESS_TICKS_AND_SLEEP( xExpectedIdleTime );
3519 traceLOW_POWER_IDLE_END();
3523 mtCOVERAGE_TEST_MARKER();
3526 ( void ) xTaskResumeAll();
3530 mtCOVERAGE_TEST_MARKER();
3533 #endif /* configUSE_TICKLESS_IDLE */
3536 /*-----------------------------------------------------------*/
3538 #if ( configUSE_TICKLESS_IDLE != 0 )
3540 eSleepModeStatus eTaskConfirmSleepModeStatus( void )
3542 #if ( INCLUDE_vTaskSuspend == 1 )
3543 /* The idle task exists in addition to the application tasks. */
3544 const UBaseType_t uxNonApplicationTasks = 1;
3545 #endif /* INCLUDE_vTaskSuspend */
3547 eSleepModeStatus eReturn = eStandardSleep;
3549 /* This function must be called from a critical section. */
3551 if( listCURRENT_LIST_LENGTH( &xPendingReadyList ) != 0 )
3553 /* A task was made ready while the scheduler was suspended. */
3554 eReturn = eAbortSleep;
3556 else if( xYieldPending != pdFALSE )
3558 /* A yield was pended while the scheduler was suspended. */
3559 eReturn = eAbortSleep;
3561 else if( xPendedTicks != 0 )
3563 /* A tick interrupt has already occurred but was held pending
3564 * because the scheduler is suspended. */
3565 eReturn = eAbortSleep;
3568 #if ( INCLUDE_vTaskSuspend == 1 )
3569 else if( listCURRENT_LIST_LENGTH( &xSuspendedTaskList ) == ( uxCurrentNumberOfTasks - uxNonApplicationTasks ) )
3571 /* If all the tasks are in the suspended list (which might mean they
3572 * have an infinite block time rather than actually being suspended)
3573 * then it is safe to turn all clocks off and just wait for external
3575 eReturn = eNoTasksWaitingTimeout;
3577 #endif /* INCLUDE_vTaskSuspend */
3580 mtCOVERAGE_TEST_MARKER();
3586 #endif /* configUSE_TICKLESS_IDLE */
3587 /*-----------------------------------------------------------*/
3589 #if ( configNUM_THREAD_LOCAL_STORAGE_POINTERS != 0 )
3591 void vTaskSetThreadLocalStoragePointer( TaskHandle_t xTaskToSet,
3597 if( ( xIndex >= 0 ) &&
3598 ( xIndex < configNUM_THREAD_LOCAL_STORAGE_POINTERS ) )
3600 pxTCB = prvGetTCBFromHandle( xTaskToSet );
3601 configASSERT( pxTCB != NULL );
3602 pxTCB->pvThreadLocalStoragePointers[ xIndex ] = pvValue;
3606 #endif /* configNUM_THREAD_LOCAL_STORAGE_POINTERS */
3607 /*-----------------------------------------------------------*/
3609 #if ( configNUM_THREAD_LOCAL_STORAGE_POINTERS != 0 )
3611 void * pvTaskGetThreadLocalStoragePointer( TaskHandle_t xTaskToQuery,
3614 void * pvReturn = NULL;
3617 if( ( xIndex >= 0 ) &&
3618 ( xIndex < configNUM_THREAD_LOCAL_STORAGE_POINTERS ) )
3620 pxTCB = prvGetTCBFromHandle( xTaskToQuery );
3621 pvReturn = pxTCB->pvThreadLocalStoragePointers[ xIndex ];
3631 #endif /* configNUM_THREAD_LOCAL_STORAGE_POINTERS */
3632 /*-----------------------------------------------------------*/
3634 #if ( portUSING_MPU_WRAPPERS == 1 )
3636 void vTaskAllocateMPURegions( TaskHandle_t xTaskToModify,
3637 const MemoryRegion_t * const xRegions )
3641 /* If null is passed in here then we are modifying the MPU settings of
3642 * the calling task. */
3643 pxTCB = prvGetTCBFromHandle( xTaskToModify );
3645 vPortStoreTaskMPUSettings( &( pxTCB->xMPUSettings ), xRegions, NULL, 0 );
3648 #endif /* portUSING_MPU_WRAPPERS */
3649 /*-----------------------------------------------------------*/
3651 static void prvInitialiseTaskLists( void )
3653 UBaseType_t uxPriority;
3655 for( uxPriority = ( UBaseType_t ) 0U; uxPriority < ( UBaseType_t ) configMAX_PRIORITIES; uxPriority++ )
3657 vListInitialise( &( pxReadyTasksLists[ uxPriority ] ) );
3660 vListInitialise( &xDelayedTaskList1 );
3661 vListInitialise( &xDelayedTaskList2 );
3662 vListInitialise( &xPendingReadyList );
3664 #if ( INCLUDE_vTaskDelete == 1 )
3666 vListInitialise( &xTasksWaitingTermination );
3668 #endif /* INCLUDE_vTaskDelete */
3670 #if ( INCLUDE_vTaskSuspend == 1 )
3672 vListInitialise( &xSuspendedTaskList );
3674 #endif /* INCLUDE_vTaskSuspend */
3676 /* Start with pxDelayedTaskList using list1 and the pxOverflowDelayedTaskList
3678 pxDelayedTaskList = &xDelayedTaskList1;
3679 pxOverflowDelayedTaskList = &xDelayedTaskList2;
3681 /*-----------------------------------------------------------*/
3683 static void prvCheckTasksWaitingTermination( void )
3685 /** THIS FUNCTION IS CALLED FROM THE RTOS IDLE TASK **/
3687 #if ( INCLUDE_vTaskDelete == 1 )
3691 /* uxDeletedTasksWaitingCleanUp is used to prevent taskENTER_CRITICAL()
3692 * being called too often in the idle task. */
3693 while( uxDeletedTasksWaitingCleanUp > ( UBaseType_t ) 0U )
3695 taskENTER_CRITICAL();
3697 pxTCB = listGET_OWNER_OF_HEAD_ENTRY( ( &xTasksWaitingTermination ) ); /*lint !e9079 void * is used as this macro is used with timers too. Alignment is known to be fine as the type of the pointer stored and retrieved is the same. */
3698 ( void ) uxListRemove( &( pxTCB->xStateListItem ) );
3699 --uxCurrentNumberOfTasks;
3700 --uxDeletedTasksWaitingCleanUp;
3702 taskEXIT_CRITICAL();
3704 prvDeleteTCB( pxTCB );
3707 #endif /* INCLUDE_vTaskDelete */
3709 /*-----------------------------------------------------------*/
3711 #if ( configUSE_TRACE_FACILITY == 1 )
3713 void vTaskGetInfo( TaskHandle_t xTask,
3714 TaskStatus_t * pxTaskStatus,
3715 BaseType_t xGetFreeStackSpace,
3720 /* xTask is NULL then get the state of the calling task. */
3721 pxTCB = prvGetTCBFromHandle( xTask );
3723 pxTaskStatus->xHandle = ( TaskHandle_t ) pxTCB;
3724 pxTaskStatus->pcTaskName = ( const char * ) &( pxTCB->pcTaskName[ 0 ] );
3725 pxTaskStatus->uxCurrentPriority = pxTCB->uxPriority;
3726 pxTaskStatus->pxStackBase = pxTCB->pxStack;
3727 #if ( ( portSTACK_GROWTH > 0 ) && ( configRECORD_STACK_HIGH_ADDRESS == 1 ) )
3728 pxTaskStatus->pxTopOfStack = pxTCB->pxTopOfStack;
3729 pxTaskStatus->pxEndOfStack = pxTCB->pxEndOfStack;
3731 pxTaskStatus->xTaskNumber = pxTCB->uxTCBNumber;
3733 #if ( configUSE_MUTEXES == 1 )
3735 pxTaskStatus->uxBasePriority = pxTCB->uxBasePriority;
3739 pxTaskStatus->uxBasePriority = 0;
3743 #if ( configGENERATE_RUN_TIME_STATS == 1 )
3745 pxTaskStatus->ulRunTimeCounter = pxTCB->ulRunTimeCounter;
3749 pxTaskStatus->ulRunTimeCounter = ( configRUN_TIME_COUNTER_TYPE ) 0;
3753 /* Obtaining the task state is a little fiddly, so is only done if the
3754 * value of eState passed into this function is eInvalid - otherwise the
3755 * state is just set to whatever is passed in. */
3756 if( eState != eInvalid )
3758 if( pxTCB == pxCurrentTCB )
3760 pxTaskStatus->eCurrentState = eRunning;
3764 pxTaskStatus->eCurrentState = eState;
3766 #if ( INCLUDE_vTaskSuspend == 1 )
3768 /* If the task is in the suspended list then there is a
3769 * chance it is actually just blocked indefinitely - so really
3770 * it should be reported as being in the Blocked state. */
3771 if( eState == eSuspended )
3775 if( listLIST_ITEM_CONTAINER( &( pxTCB->xEventListItem ) ) != NULL )
3777 pxTaskStatus->eCurrentState = eBlocked;
3780 ( void ) xTaskResumeAll();
3783 #endif /* INCLUDE_vTaskSuspend */
3788 pxTaskStatus->eCurrentState = eTaskGetState( pxTCB );
3791 /* Obtaining the stack space takes some time, so the xGetFreeStackSpace
3792 * parameter is provided to allow it to be skipped. */
3793 if( xGetFreeStackSpace != pdFALSE )
3795 #if ( portSTACK_GROWTH > 0 )
3797 pxTaskStatus->usStackHighWaterMark = prvTaskCheckFreeStackSpace( ( uint8_t * ) pxTCB->pxEndOfStack );
3801 pxTaskStatus->usStackHighWaterMark = prvTaskCheckFreeStackSpace( ( uint8_t * ) pxTCB->pxStack );
3807 pxTaskStatus->usStackHighWaterMark = 0;
3811 #endif /* configUSE_TRACE_FACILITY */
3812 /*-----------------------------------------------------------*/
3814 #if ( configUSE_TRACE_FACILITY == 1 )
3816 static UBaseType_t prvListTasksWithinSingleList( TaskStatus_t * pxTaskStatusArray,
3820 configLIST_VOLATILE TCB_t * pxNextTCB;
3821 configLIST_VOLATILE TCB_t * pxFirstTCB;
3822 UBaseType_t uxTask = 0;
3824 if( listCURRENT_LIST_LENGTH( pxList ) > ( UBaseType_t ) 0 )
3826 listGET_OWNER_OF_NEXT_ENTRY( pxFirstTCB, pxList ); /*lint !e9079 void * is used as this macro is used with timers too. Alignment is known to be fine as the type of the pointer stored and retrieved is the same. */
3828 /* Populate an TaskStatus_t structure within the
3829 * pxTaskStatusArray array for each task that is referenced from
3830 * pxList. See the definition of TaskStatus_t in task.h for the
3831 * meaning of each TaskStatus_t structure member. */
3834 listGET_OWNER_OF_NEXT_ENTRY( pxNextTCB, pxList ); /*lint !e9079 void * is used as this macro is used with timers too. Alignment is known to be fine as the type of the pointer stored and retrieved is the same. */
3835 vTaskGetInfo( ( TaskHandle_t ) pxNextTCB, &( pxTaskStatusArray[ uxTask ] ), pdTRUE, eState );
3837 } while( pxNextTCB != pxFirstTCB );
3841 mtCOVERAGE_TEST_MARKER();
3847 #endif /* configUSE_TRACE_FACILITY */
3848 /*-----------------------------------------------------------*/
3850 #if ( ( configUSE_TRACE_FACILITY == 1 ) || ( INCLUDE_uxTaskGetStackHighWaterMark == 1 ) || ( INCLUDE_uxTaskGetStackHighWaterMark2 == 1 ) )
3852 static configSTACK_DEPTH_TYPE prvTaskCheckFreeStackSpace( const uint8_t * pucStackByte )
3854 uint32_t ulCount = 0U;
3856 while( *pucStackByte == ( uint8_t ) tskSTACK_FILL_BYTE )
3858 pucStackByte -= portSTACK_GROWTH;
3862 ulCount /= ( uint32_t ) sizeof( StackType_t ); /*lint !e961 Casting is not redundant on smaller architectures. */
3864 return ( configSTACK_DEPTH_TYPE ) ulCount;
3867 #endif /* ( ( configUSE_TRACE_FACILITY == 1 ) || ( INCLUDE_uxTaskGetStackHighWaterMark == 1 ) || ( INCLUDE_uxTaskGetStackHighWaterMark2 == 1 ) ) */
3868 /*-----------------------------------------------------------*/
3870 #if ( INCLUDE_uxTaskGetStackHighWaterMark2 == 1 )
3872 /* uxTaskGetStackHighWaterMark() and uxTaskGetStackHighWaterMark2() are the
3873 * same except for their return type. Using configSTACK_DEPTH_TYPE allows the
3874 * user to determine the return type. It gets around the problem of the value
3875 * overflowing on 8-bit types without breaking backward compatibility for
3876 * applications that expect an 8-bit return type. */
3877 configSTACK_DEPTH_TYPE uxTaskGetStackHighWaterMark2( TaskHandle_t xTask )
3880 uint8_t * pucEndOfStack;
3881 configSTACK_DEPTH_TYPE uxReturn;
3883 /* uxTaskGetStackHighWaterMark() and uxTaskGetStackHighWaterMark2() are
3884 * the same except for their return type. Using configSTACK_DEPTH_TYPE
3885 * allows the user to determine the return type. It gets around the
3886 * problem of the value overflowing on 8-bit types without breaking
3887 * backward compatibility for applications that expect an 8-bit return
3890 pxTCB = prvGetTCBFromHandle( xTask );
3892 #if portSTACK_GROWTH < 0
3894 pucEndOfStack = ( uint8_t * ) pxTCB->pxStack;
3898 pucEndOfStack = ( uint8_t * ) pxTCB->pxEndOfStack;
3902 uxReturn = prvTaskCheckFreeStackSpace( pucEndOfStack );
3907 #endif /* INCLUDE_uxTaskGetStackHighWaterMark2 */
3908 /*-----------------------------------------------------------*/
3910 #if ( INCLUDE_uxTaskGetStackHighWaterMark == 1 )
3912 UBaseType_t uxTaskGetStackHighWaterMark( TaskHandle_t xTask )
3915 uint8_t * pucEndOfStack;
3916 UBaseType_t uxReturn;
3918 pxTCB = prvGetTCBFromHandle( xTask );
3920 #if portSTACK_GROWTH < 0
3922 pucEndOfStack = ( uint8_t * ) pxTCB->pxStack;
3926 pucEndOfStack = ( uint8_t * ) pxTCB->pxEndOfStack;
3930 uxReturn = ( UBaseType_t ) prvTaskCheckFreeStackSpace( pucEndOfStack );
3935 #endif /* INCLUDE_uxTaskGetStackHighWaterMark */
3936 /*-----------------------------------------------------------*/
3938 #if ( INCLUDE_vTaskDelete == 1 )
3940 static void prvDeleteTCB( TCB_t * pxTCB )
3942 /* This call is required specifically for the TriCore port. It must be
3943 * above the vPortFree() calls. The call is also used by ports/demos that
3944 * want to allocate and clean RAM statically. */
3945 portCLEAN_UP_TCB( pxTCB );
3947 #if ( ( configUSE_NEWLIB_REENTRANT == 1 ) || ( configUSE_C_RUNTIME_TLS_SUPPORT == 1 ) )
3949 /* Free up the memory allocated for the task's TLS Block. */
3950 configDEINIT_TLS_BLOCK( pxCurrentTCB->xTLSBlock );
3954 #if ( ( configSUPPORT_DYNAMIC_ALLOCATION == 1 ) && ( configSUPPORT_STATIC_ALLOCATION == 0 ) && ( portUSING_MPU_WRAPPERS == 0 ) )
3956 /* The task can only have been allocated dynamically - free both
3957 * the stack and TCB. */
3958 vPortFreeStack( pxTCB->pxStack );
3961 #elif ( tskSTATIC_AND_DYNAMIC_ALLOCATION_POSSIBLE != 0 ) /*lint !e731 !e9029 Macro has been consolidated for readability reasons. */
3963 /* The task could have been allocated statically or dynamically, so
3964 * check what was statically allocated before trying to free the
3966 if( pxTCB->ucStaticallyAllocated == tskDYNAMICALLY_ALLOCATED_STACK_AND_TCB )
3968 /* Both the stack and TCB were allocated dynamically, so both
3970 vPortFreeStack( pxTCB->pxStack );
3973 else if( pxTCB->ucStaticallyAllocated == tskSTATICALLY_ALLOCATED_STACK_ONLY )
3975 /* Only the stack was statically allocated, so the TCB is the
3976 * only memory that must be freed. */
3981 /* Neither the stack nor the TCB were allocated dynamically, so
3982 * nothing needs to be freed. */
3983 configASSERT( pxTCB->ucStaticallyAllocated == tskSTATICALLY_ALLOCATED_STACK_AND_TCB );
3984 mtCOVERAGE_TEST_MARKER();
3987 #endif /* configSUPPORT_DYNAMIC_ALLOCATION */
3990 #endif /* INCLUDE_vTaskDelete */
3991 /*-----------------------------------------------------------*/
3993 static void prvResetNextTaskUnblockTime( void )
3995 if( listLIST_IS_EMPTY( pxDelayedTaskList ) != pdFALSE )
3997 /* The new current delayed list is empty. Set xNextTaskUnblockTime to
3998 * the maximum possible value so it is extremely unlikely that the
3999 * if( xTickCount >= xNextTaskUnblockTime ) test will pass until
4000 * there is an item in the delayed list. */
4001 xNextTaskUnblockTime = portMAX_DELAY;
4005 /* The new current delayed list is not empty, get the value of
4006 * the item at the head of the delayed list. This is the time at
4007 * which the task at the head of the delayed list should be removed
4008 * from the Blocked state. */
4009 xNextTaskUnblockTime = listGET_ITEM_VALUE_OF_HEAD_ENTRY( pxDelayedTaskList );
4012 /*-----------------------------------------------------------*/
4014 #if ( ( INCLUDE_xTaskGetCurrentTaskHandle == 1 ) || ( configUSE_MUTEXES == 1 ) )
4016 TaskHandle_t xTaskGetCurrentTaskHandle( void )
4018 TaskHandle_t xReturn;
4020 /* A critical section is not required as this is not called from
4021 * an interrupt and the current TCB will always be the same for any
4022 * individual execution thread. */
4023 xReturn = pxCurrentTCB;
4028 #endif /* ( ( INCLUDE_xTaskGetCurrentTaskHandle == 1 ) || ( configUSE_MUTEXES == 1 ) ) */
4029 /*-----------------------------------------------------------*/
4031 #if ( ( INCLUDE_xTaskGetSchedulerState == 1 ) || ( configUSE_TIMERS == 1 ) )
4033 BaseType_t xTaskGetSchedulerState( void )
4037 if( xSchedulerRunning == pdFALSE )
4039 xReturn = taskSCHEDULER_NOT_STARTED;
4043 if( uxSchedulerSuspended == ( UBaseType_t ) pdFALSE )
4045 xReturn = taskSCHEDULER_RUNNING;
4049 xReturn = taskSCHEDULER_SUSPENDED;
4056 #endif /* ( ( INCLUDE_xTaskGetSchedulerState == 1 ) || ( configUSE_TIMERS == 1 ) ) */
4057 /*-----------------------------------------------------------*/
4059 #if ( configUSE_MUTEXES == 1 )
4061 BaseType_t xTaskPriorityInherit( TaskHandle_t const pxMutexHolder )
4063 TCB_t * const pxMutexHolderTCB = pxMutexHolder;
4064 BaseType_t xReturn = pdFALSE;
4066 /* If the mutex was given back by an interrupt while the queue was
4067 * locked then the mutex holder might now be NULL. _RB_ Is this still
4068 * needed as interrupts can no longer use mutexes? */
4069 if( pxMutexHolder != NULL )
4071 /* If the holder of the mutex has a priority below the priority of
4072 * the task attempting to obtain the mutex then it will temporarily
4073 * inherit the priority of the task attempting to obtain the mutex. */
4074 if( pxMutexHolderTCB->uxPriority < pxCurrentTCB->uxPriority )
4076 /* Adjust the mutex holder state to account for its new
4077 * priority. Only reset the event list item value if the value is
4078 * not being used for anything else. */
4079 if( ( listGET_LIST_ITEM_VALUE( &( pxMutexHolderTCB->xEventListItem ) ) & taskEVENT_LIST_ITEM_VALUE_IN_USE ) == 0UL )
4081 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. */
4085 mtCOVERAGE_TEST_MARKER();
4088 /* If the task being modified is in the ready state it will need
4089 * to be moved into a new list. */
4090 if( listIS_CONTAINED_WITHIN( &( pxReadyTasksLists[ pxMutexHolderTCB->uxPriority ] ), &( pxMutexHolderTCB->xStateListItem ) ) != pdFALSE )
4092 if( uxListRemove( &( pxMutexHolderTCB->xStateListItem ) ) == ( UBaseType_t ) 0 )
4094 /* It is known that the task is in its ready list so
4095 * there is no need to check again and the port level
4096 * reset macro can be called directly. */
4097 portRESET_READY_PRIORITY( pxMutexHolderTCB->uxPriority, uxTopReadyPriority );
4101 mtCOVERAGE_TEST_MARKER();
4104 /* Inherit the priority before being moved into the new list. */
4105 pxMutexHolderTCB->uxPriority = pxCurrentTCB->uxPriority;
4106 prvAddTaskToReadyList( pxMutexHolderTCB );
4110 /* Just inherit the priority. */
4111 pxMutexHolderTCB->uxPriority = pxCurrentTCB->uxPriority;
4114 traceTASK_PRIORITY_INHERIT( pxMutexHolderTCB, pxCurrentTCB->uxPriority );
4116 /* Inheritance occurred. */
4121 if( pxMutexHolderTCB->uxBasePriority < pxCurrentTCB->uxPriority )
4123 /* The base priority of the mutex holder is lower than the
4124 * priority of the task attempting to take the mutex, but the
4125 * current priority of the mutex holder is not lower than the
4126 * priority of the task attempting to take the mutex.
4127 * Therefore the mutex holder must have already inherited a
4128 * priority, but inheritance would have occurred if that had
4129 * not been the case. */
4134 mtCOVERAGE_TEST_MARKER();
4140 mtCOVERAGE_TEST_MARKER();
4146 #endif /* configUSE_MUTEXES */
4147 /*-----------------------------------------------------------*/
4149 #if ( configUSE_MUTEXES == 1 )
4151 BaseType_t xTaskPriorityDisinherit( TaskHandle_t const pxMutexHolder )
4153 TCB_t * const pxTCB = pxMutexHolder;
4154 BaseType_t xReturn = pdFALSE;
4156 if( pxMutexHolder != NULL )
4158 /* A task can only have an inherited priority if it holds the mutex.
4159 * If the mutex is held by a task then it cannot be given from an
4160 * interrupt, and if a mutex is given by the holding task then it must
4161 * be the running state task. */
4162 configASSERT( pxTCB == pxCurrentTCB );
4163 configASSERT( pxTCB->uxMutexesHeld );
4164 ( pxTCB->uxMutexesHeld )--;
4166 /* Has the holder of the mutex inherited the priority of another
4168 if( pxTCB->uxPriority != pxTCB->uxBasePriority )
4170 /* Only disinherit if no other mutexes are held. */
4171 if( pxTCB->uxMutexesHeld == ( UBaseType_t ) 0 )
4173 /* A task can only have an inherited priority if it holds
4174 * the mutex. If the mutex is held by a task then it cannot be
4175 * given from an interrupt, and if a mutex is given by the
4176 * holding task then it must be the running state task. Remove
4177 * the holding task from the ready list. */
4178 if( uxListRemove( &( pxTCB->xStateListItem ) ) == ( UBaseType_t ) 0 )
4180 portRESET_READY_PRIORITY( pxTCB->uxPriority, uxTopReadyPriority );
4184 mtCOVERAGE_TEST_MARKER();
4187 /* Disinherit the priority before adding the task into the
4188 * new ready list. */
4189 traceTASK_PRIORITY_DISINHERIT( pxTCB, pxTCB->uxBasePriority );
4190 pxTCB->uxPriority = pxTCB->uxBasePriority;
4192 /* Reset the event list item value. It cannot be in use for
4193 * any other purpose if this task is running, and it must be
4194 * running to give back the mutex. */
4195 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. */
4196 prvAddTaskToReadyList( pxTCB );
4198 /* Return true to indicate that a context switch is required.
4199 * This is only actually required in the corner case whereby
4200 * multiple mutexes were held and the mutexes were given back
4201 * in an order different to that in which they were taken.
4202 * If a context switch did not occur when the first mutex was
4203 * returned, even if a task was waiting on it, then a context
4204 * switch should occur when the last mutex is returned whether
4205 * a task is waiting on it or not. */
4210 mtCOVERAGE_TEST_MARKER();
4215 mtCOVERAGE_TEST_MARKER();
4220 mtCOVERAGE_TEST_MARKER();
4226 #endif /* configUSE_MUTEXES */
4227 /*-----------------------------------------------------------*/
4229 #if ( configUSE_MUTEXES == 1 )
4231 void vTaskPriorityDisinheritAfterTimeout( TaskHandle_t const pxMutexHolder,
4232 UBaseType_t uxHighestPriorityWaitingTask )
4234 TCB_t * const pxTCB = pxMutexHolder;
4235 UBaseType_t uxPriorityUsedOnEntry, uxPriorityToUse;
4236 const UBaseType_t uxOnlyOneMutexHeld = ( UBaseType_t ) 1;
4238 if( pxMutexHolder != NULL )
4240 /* If pxMutexHolder is not NULL then the holder must hold at least
4242 configASSERT( pxTCB->uxMutexesHeld );
4244 /* Determine the priority to which the priority of the task that
4245 * holds the mutex should be set. This will be the greater of the
4246 * holding task's base priority and the priority of the highest
4247 * priority task that is waiting to obtain the mutex. */
4248 if( pxTCB->uxBasePriority < uxHighestPriorityWaitingTask )
4250 uxPriorityToUse = uxHighestPriorityWaitingTask;
4254 uxPriorityToUse = pxTCB->uxBasePriority;
4257 /* Does the priority need to change? */
4258 if( pxTCB->uxPriority != uxPriorityToUse )
4260 /* Only disinherit if no other mutexes are held. This is a
4261 * simplification in the priority inheritance implementation. If
4262 * the task that holds the mutex is also holding other mutexes then
4263 * the other mutexes may have caused the priority inheritance. */
4264 if( pxTCB->uxMutexesHeld == uxOnlyOneMutexHeld )
4266 /* If a task has timed out because it already holds the
4267 * mutex it was trying to obtain then it cannot of inherited
4268 * its own priority. */
4269 configASSERT( pxTCB != pxCurrentTCB );
4271 /* Disinherit the priority, remembering the previous
4272 * priority to facilitate determining the subject task's
4274 traceTASK_PRIORITY_DISINHERIT( pxTCB, uxPriorityToUse );
4275 uxPriorityUsedOnEntry = pxTCB->uxPriority;
4276 pxTCB->uxPriority = uxPriorityToUse;
4278 /* Only reset the event list item value if the value is not
4279 * being used for anything else. */
4280 if( ( listGET_LIST_ITEM_VALUE( &( pxTCB->xEventListItem ) ) & taskEVENT_LIST_ITEM_VALUE_IN_USE ) == 0UL )
4282 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. */
4286 mtCOVERAGE_TEST_MARKER();
4289 /* If the running task is not the task that holds the mutex
4290 * then the task that holds the mutex could be in either the
4291 * Ready, Blocked or Suspended states. Only remove the task
4292 * from its current state list if it is in the Ready state as
4293 * the task's priority is going to change and there is one
4294 * Ready list per priority. */
4295 if( listIS_CONTAINED_WITHIN( &( pxReadyTasksLists[ uxPriorityUsedOnEntry ] ), &( pxTCB->xStateListItem ) ) != pdFALSE )
4297 if( uxListRemove( &( pxTCB->xStateListItem ) ) == ( UBaseType_t ) 0 )
4299 /* It is known that the task is in its ready list so
4300 * there is no need to check again and the port level
4301 * reset macro can be called directly. */
4302 portRESET_READY_PRIORITY( pxTCB->uxPriority, uxTopReadyPriority );
4306 mtCOVERAGE_TEST_MARKER();
4309 prvAddTaskToReadyList( pxTCB );
4313 mtCOVERAGE_TEST_MARKER();
4318 mtCOVERAGE_TEST_MARKER();
4323 mtCOVERAGE_TEST_MARKER();
4328 mtCOVERAGE_TEST_MARKER();
4332 #endif /* configUSE_MUTEXES */
4333 /*-----------------------------------------------------------*/
4335 #if ( portCRITICAL_NESTING_IN_TCB == 1 )
4337 void vTaskEnterCritical( void )
4339 portDISABLE_INTERRUPTS();
4341 if( xSchedulerRunning != pdFALSE )
4343 ( pxCurrentTCB->uxCriticalNesting )++;
4345 /* This is not the interrupt safe version of the enter critical
4346 * function so assert() if it is being called from an interrupt
4347 * context. Only API functions that end in "FromISR" can be used in an
4348 * interrupt. Only assert if the critical nesting count is 1 to
4349 * protect against recursive calls if the assert function also uses a
4350 * critical section. */
4351 if( pxCurrentTCB->uxCriticalNesting == 1 )
4353 portASSERT_IF_IN_ISR();
4358 mtCOVERAGE_TEST_MARKER();
4362 #endif /* portCRITICAL_NESTING_IN_TCB */
4363 /*-----------------------------------------------------------*/
4365 #if ( portCRITICAL_NESTING_IN_TCB == 1 )
4367 void vTaskExitCritical( void )
4369 if( xSchedulerRunning != pdFALSE )
4371 if( pxCurrentTCB->uxCriticalNesting > 0U )
4373 ( pxCurrentTCB->uxCriticalNesting )--;
4375 if( pxCurrentTCB->uxCriticalNesting == 0U )
4377 portENABLE_INTERRUPTS();
4381 mtCOVERAGE_TEST_MARKER();
4386 mtCOVERAGE_TEST_MARKER();
4391 mtCOVERAGE_TEST_MARKER();
4395 #endif /* portCRITICAL_NESTING_IN_TCB */
4396 /*-----------------------------------------------------------*/
4398 #if ( configUSE_STATS_FORMATTING_FUNCTIONS > 0 )
4400 static char * prvWriteNameToBuffer( char * pcBuffer,
4401 const char * pcTaskName )
4405 /* Start by copying the entire string. */
4406 strcpy( pcBuffer, pcTaskName );
4408 /* Pad the end of the string with spaces to ensure columns line up when
4410 for( x = strlen( pcBuffer ); x < ( size_t ) ( configMAX_TASK_NAME_LEN - 1 ); x++ )
4412 pcBuffer[ x ] = ' ';
4416 pcBuffer[ x ] = ( char ) 0x00;
4418 /* Return the new end of string. */
4419 return &( pcBuffer[ x ] );
4422 #endif /* ( configUSE_STATS_FORMATTING_FUNCTIONS > 0 ) */
4423 /*-----------------------------------------------------------*/
4425 #if ( ( configUSE_TRACE_FACILITY == 1 ) && ( configUSE_STATS_FORMATTING_FUNCTIONS > 0 ) )
4427 void vTaskList( char * pcWriteBuffer )
4429 TaskStatus_t * pxTaskStatusArray;
4430 UBaseType_t uxArraySize, x;
4436 * This function is provided for convenience only, and is used by many
4437 * of the demo applications. Do not consider it to be part of the
4440 * vTaskList() calls uxTaskGetSystemState(), then formats part of the
4441 * uxTaskGetSystemState() output into a human readable table that
4442 * displays task: names, states, priority, stack usage and task number.
4443 * Stack usage specified as the number of unused StackType_t words stack can hold
4444 * on top of stack - not the number of bytes.
4446 * vTaskList() has a dependency on the sprintf() C library function that
4447 * might bloat the code size, use a lot of stack, and provide different
4448 * results on different platforms. An alternative, tiny, third party,
4449 * and limited functionality implementation of sprintf() is provided in
4450 * many of the FreeRTOS/Demo sub-directories in a file called
4451 * printf-stdarg.c (note printf-stdarg.c does not provide a full
4452 * snprintf() implementation!).
4454 * It is recommended that production systems call uxTaskGetSystemState()
4455 * directly to get access to raw stats data, rather than indirectly
4456 * through a call to vTaskList().
4460 /* Make sure the write buffer does not contain a string. */
4461 *pcWriteBuffer = ( char ) 0x00;
4463 /* Take a snapshot of the number of tasks in case it changes while this
4464 * function is executing. */
4465 uxArraySize = uxCurrentNumberOfTasks;
4467 /* Allocate an array index for each task. NOTE! if
4468 * configSUPPORT_DYNAMIC_ALLOCATION is set to 0 then pvPortMalloc() will
4469 * equate to NULL. */
4470 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. */
4472 if( pxTaskStatusArray != NULL )
4474 /* Generate the (binary) data. */
4475 uxArraySize = uxTaskGetSystemState( pxTaskStatusArray, uxArraySize, NULL );
4477 /* Create a human readable table from the binary data. */
4478 for( x = 0; x < uxArraySize; x++ )
4480 switch( pxTaskStatusArray[ x ].eCurrentState )
4483 cStatus = tskRUNNING_CHAR;
4487 cStatus = tskREADY_CHAR;
4491 cStatus = tskBLOCKED_CHAR;
4495 cStatus = tskSUSPENDED_CHAR;
4499 cStatus = tskDELETED_CHAR;
4502 case eInvalid: /* Fall through. */
4503 default: /* Should not get here, but it is included
4504 * to prevent static checking errors. */
4505 cStatus = ( char ) 0x00;
4509 /* Write the task name to the string, padding with spaces so it
4510 * can be printed in tabular form more easily. */
4511 pcWriteBuffer = prvWriteNameToBuffer( pcWriteBuffer, pxTaskStatusArray[ x ].pcTaskName );
4513 /* Write the rest of the string. */
4514 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. */
4515 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. */
4518 /* Free the array again. NOTE! If configSUPPORT_DYNAMIC_ALLOCATION
4519 * is 0 then vPortFree() will be #defined to nothing. */
4520 vPortFree( pxTaskStatusArray );
4524 mtCOVERAGE_TEST_MARKER();
4528 #endif /* ( ( configUSE_TRACE_FACILITY == 1 ) && ( configUSE_STATS_FORMATTING_FUNCTIONS > 0 ) ) */
4529 /*----------------------------------------------------------*/
4531 #if ( ( configGENERATE_RUN_TIME_STATS == 1 ) && ( configUSE_STATS_FORMATTING_FUNCTIONS > 0 ) && ( configUSE_TRACE_FACILITY == 1 ) )
4533 void vTaskGetRunTimeStats( char * pcWriteBuffer )
4535 TaskStatus_t * pxTaskStatusArray;
4536 UBaseType_t uxArraySize, x;
4537 configRUN_TIME_COUNTER_TYPE ulTotalTime, ulStatsAsPercentage;
4542 * This function is provided for convenience only, and is used by many
4543 * of the demo applications. Do not consider it to be part of the
4546 * vTaskGetRunTimeStats() calls uxTaskGetSystemState(), then formats part
4547 * of the uxTaskGetSystemState() output into a human readable table that
4548 * displays the amount of time each task has spent in the Running state
4549 * in both absolute and percentage terms.
4551 * vTaskGetRunTimeStats() has a dependency on the sprintf() C library
4552 * function that might bloat the code size, use a lot of stack, and
4553 * provide different results on different platforms. An alternative,
4554 * tiny, third party, and limited functionality implementation of
4555 * sprintf() is provided in many of the FreeRTOS/Demo sub-directories in
4556 * a file called printf-stdarg.c (note printf-stdarg.c does not provide
4557 * a full snprintf() implementation!).
4559 * It is recommended that production systems call uxTaskGetSystemState()
4560 * directly to get access to raw stats data, rather than indirectly
4561 * through a call to vTaskGetRunTimeStats().
4564 /* Make sure the write buffer does not contain a string. */
4565 *pcWriteBuffer = ( char ) 0x00;
4567 /* Take a snapshot of the number of tasks in case it changes while this
4568 * function is executing. */
4569 uxArraySize = uxCurrentNumberOfTasks;
4571 /* Allocate an array index for each task. NOTE! If
4572 * configSUPPORT_DYNAMIC_ALLOCATION is set to 0 then pvPortMalloc() will
4573 * equate to NULL. */
4574 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. */
4576 if( pxTaskStatusArray != NULL )
4578 /* Generate the (binary) data. */
4579 uxArraySize = uxTaskGetSystemState( pxTaskStatusArray, uxArraySize, &ulTotalTime );
4581 /* For percentage calculations. */
4582 ulTotalTime /= 100UL;
4584 /* Avoid divide by zero errors. */
4585 if( ulTotalTime > 0UL )
4587 /* Create a human readable table from the binary data. */
4588 for( x = 0; x < uxArraySize; x++ )
4590 /* What percentage of the total run time has the task used?
4591 * This will always be rounded down to the nearest integer.
4592 * ulTotalRunTime has already been divided by 100. */
4593 ulStatsAsPercentage = pxTaskStatusArray[ x ].ulRunTimeCounter / ulTotalTime;
4595 /* Write the task name to the string, padding with
4596 * spaces so it can be printed in tabular form more
4598 pcWriteBuffer = prvWriteNameToBuffer( pcWriteBuffer, pxTaskStatusArray[ x ].pcTaskName );
4600 if( ulStatsAsPercentage > 0UL )
4602 #ifdef portLU_PRINTF_SPECIFIER_REQUIRED
4604 sprintf( pcWriteBuffer, "\t%lu\t\t%lu%%\r\n", pxTaskStatusArray[ x ].ulRunTimeCounter, ulStatsAsPercentage );
4608 /* sizeof( int ) == sizeof( long ) so a smaller
4609 * printf() library can be used. */
4610 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. */
4616 /* If the percentage is zero here then the task has
4617 * consumed less than 1% of the total run time. */
4618 #ifdef portLU_PRINTF_SPECIFIER_REQUIRED
4620 sprintf( pcWriteBuffer, "\t%lu\t\t<1%%\r\n", pxTaskStatusArray[ x ].ulRunTimeCounter );
4624 /* sizeof( int ) == sizeof( long ) so a smaller
4625 * printf() library can be used. */
4626 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. */
4631 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. */
4636 mtCOVERAGE_TEST_MARKER();
4639 /* Free the array again. NOTE! If configSUPPORT_DYNAMIC_ALLOCATION
4640 * is 0 then vPortFree() will be #defined to nothing. */
4641 vPortFree( pxTaskStatusArray );
4645 mtCOVERAGE_TEST_MARKER();
4649 #endif /* ( ( configGENERATE_RUN_TIME_STATS == 1 ) && ( configUSE_STATS_FORMATTING_FUNCTIONS > 0 ) ) */
4650 /*-----------------------------------------------------------*/
4652 TickType_t uxTaskResetEventItemValue( void )
4654 TickType_t uxReturn;
4656 uxReturn = listGET_LIST_ITEM_VALUE( &( pxCurrentTCB->xEventListItem ) );
4658 /* Reset the event list item to its normal value - so it can be used with
4659 * queues and semaphores. */
4660 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. */
4664 /*-----------------------------------------------------------*/
4666 #if ( configUSE_MUTEXES == 1 )
4668 TaskHandle_t pvTaskIncrementMutexHeldCount( void )
4670 /* If xSemaphoreCreateMutex() is called before any tasks have been created
4671 * then pxCurrentTCB will be NULL. */
4672 if( pxCurrentTCB != NULL )
4674 ( pxCurrentTCB->uxMutexesHeld )++;
4677 return pxCurrentTCB;
4680 #endif /* configUSE_MUTEXES */
4681 /*-----------------------------------------------------------*/
4683 #if ( configUSE_TASK_NOTIFICATIONS == 1 )
4685 uint32_t ulTaskGenericNotifyTake( UBaseType_t uxIndexToWait,
4686 BaseType_t xClearCountOnExit,
4687 TickType_t xTicksToWait )
4691 configASSERT( uxIndexToWait < configTASK_NOTIFICATION_ARRAY_ENTRIES );
4693 taskENTER_CRITICAL();
4695 /* Only block if the notification count is not already non-zero. */
4696 if( pxCurrentTCB->ulNotifiedValue[ uxIndexToWait ] == 0UL )
4698 /* Mark this task as waiting for a notification. */
4699 pxCurrentTCB->ucNotifyState[ uxIndexToWait ] = taskWAITING_NOTIFICATION;
4701 if( xTicksToWait > ( TickType_t ) 0 )
4703 prvAddCurrentTaskToDelayedList( xTicksToWait, pdTRUE );
4704 traceTASK_NOTIFY_TAKE_BLOCK( uxIndexToWait );
4706 /* All ports are written to allow a yield in a critical
4707 * section (some will yield immediately, others wait until the
4708 * critical section exits) - but it is not something that
4709 * application code should ever do. */
4710 portYIELD_WITHIN_API();
4714 mtCOVERAGE_TEST_MARKER();
4719 mtCOVERAGE_TEST_MARKER();
4722 taskEXIT_CRITICAL();
4724 taskENTER_CRITICAL();
4726 traceTASK_NOTIFY_TAKE( uxIndexToWait );
4727 ulReturn = pxCurrentTCB->ulNotifiedValue[ uxIndexToWait ];
4729 if( ulReturn != 0UL )
4731 if( xClearCountOnExit != pdFALSE )
4733 pxCurrentTCB->ulNotifiedValue[ uxIndexToWait ] = 0UL;
4737 pxCurrentTCB->ulNotifiedValue[ uxIndexToWait ] = ulReturn - ( uint32_t ) 1;
4742 mtCOVERAGE_TEST_MARKER();
4745 pxCurrentTCB->ucNotifyState[ uxIndexToWait ] = taskNOT_WAITING_NOTIFICATION;
4747 taskEXIT_CRITICAL();
4752 #endif /* configUSE_TASK_NOTIFICATIONS */
4753 /*-----------------------------------------------------------*/
4755 #if ( configUSE_TASK_NOTIFICATIONS == 1 )
4757 BaseType_t xTaskGenericNotifyWait( UBaseType_t uxIndexToWait,
4758 uint32_t ulBitsToClearOnEntry,
4759 uint32_t ulBitsToClearOnExit,
4760 uint32_t * pulNotificationValue,
4761 TickType_t xTicksToWait )
4765 configASSERT( uxIndexToWait < configTASK_NOTIFICATION_ARRAY_ENTRIES );
4767 taskENTER_CRITICAL();
4769 /* Only block if a notification is not already pending. */
4770 if( pxCurrentTCB->ucNotifyState[ uxIndexToWait ] != taskNOTIFICATION_RECEIVED )
4772 /* Clear bits in the task's notification value as bits may get
4773 * set by the notifying task or interrupt. This can be used to
4774 * clear the value to zero. */
4775 pxCurrentTCB->ulNotifiedValue[ uxIndexToWait ] &= ~ulBitsToClearOnEntry;
4777 /* Mark this task as waiting for a notification. */
4778 pxCurrentTCB->ucNotifyState[ uxIndexToWait ] = taskWAITING_NOTIFICATION;
4780 if( xTicksToWait > ( TickType_t ) 0 )
4782 prvAddCurrentTaskToDelayedList( xTicksToWait, pdTRUE );
4783 traceTASK_NOTIFY_WAIT_BLOCK( uxIndexToWait );
4785 /* All ports are written to allow a yield in a critical
4786 * section (some will yield immediately, others wait until the
4787 * critical section exits) - but it is not something that
4788 * application code should ever do. */
4789 portYIELD_WITHIN_API();
4793 mtCOVERAGE_TEST_MARKER();
4798 mtCOVERAGE_TEST_MARKER();
4801 taskEXIT_CRITICAL();
4803 taskENTER_CRITICAL();
4805 traceTASK_NOTIFY_WAIT( uxIndexToWait );
4807 if( pulNotificationValue != NULL )
4809 /* Output the current notification value, which may or may not
4811 *pulNotificationValue = pxCurrentTCB->ulNotifiedValue[ uxIndexToWait ];
4814 /* If ucNotifyValue is set then either the task never entered the
4815 * blocked state (because a notification was already pending) or the
4816 * task unblocked because of a notification. Otherwise the task
4817 * unblocked because of a timeout. */
4818 if( pxCurrentTCB->ucNotifyState[ uxIndexToWait ] != taskNOTIFICATION_RECEIVED )
4820 /* A notification was not received. */
4825 /* A notification was already pending or a notification was
4826 * received while the task was waiting. */
4827 pxCurrentTCB->ulNotifiedValue[ uxIndexToWait ] &= ~ulBitsToClearOnExit;
4831 pxCurrentTCB->ucNotifyState[ uxIndexToWait ] = taskNOT_WAITING_NOTIFICATION;
4833 taskEXIT_CRITICAL();
4838 #endif /* configUSE_TASK_NOTIFICATIONS */
4839 /*-----------------------------------------------------------*/
4841 #if ( configUSE_TASK_NOTIFICATIONS == 1 )
4843 BaseType_t xTaskGenericNotify( TaskHandle_t xTaskToNotify,
4844 UBaseType_t uxIndexToNotify,
4846 eNotifyAction eAction,
4847 uint32_t * pulPreviousNotificationValue )
4850 BaseType_t xReturn = pdPASS;
4851 uint8_t ucOriginalNotifyState;
4853 configASSERT( uxIndexToNotify < configTASK_NOTIFICATION_ARRAY_ENTRIES );
4854 configASSERT( xTaskToNotify );
4855 pxTCB = xTaskToNotify;
4857 taskENTER_CRITICAL();
4859 if( pulPreviousNotificationValue != NULL )
4861 *pulPreviousNotificationValue = pxTCB->ulNotifiedValue[ uxIndexToNotify ];
4864 ucOriginalNotifyState = pxTCB->ucNotifyState[ uxIndexToNotify ];
4866 pxTCB->ucNotifyState[ uxIndexToNotify ] = taskNOTIFICATION_RECEIVED;
4871 pxTCB->ulNotifiedValue[ uxIndexToNotify ] |= ulValue;
4875 ( pxTCB->ulNotifiedValue[ uxIndexToNotify ] )++;
4878 case eSetValueWithOverwrite:
4879 pxTCB->ulNotifiedValue[ uxIndexToNotify ] = ulValue;
4882 case eSetValueWithoutOverwrite:
4884 if( ucOriginalNotifyState != taskNOTIFICATION_RECEIVED )
4886 pxTCB->ulNotifiedValue[ uxIndexToNotify ] = ulValue;
4890 /* The value could not be written to the task. */
4898 /* The task is being notified without its notify value being
4904 /* Should not get here if all enums are handled.
4905 * Artificially force an assert by testing a value the
4906 * compiler can't assume is const. */
4907 configASSERT( xTickCount == ( TickType_t ) 0 );
4912 traceTASK_NOTIFY( uxIndexToNotify );
4914 /* If the task is in the blocked state specifically to wait for a
4915 * notification then unblock it now. */
4916 if( ucOriginalNotifyState == taskWAITING_NOTIFICATION )
4918 listREMOVE_ITEM( &( pxTCB->xStateListItem ) );
4919 prvAddTaskToReadyList( pxTCB );
4921 /* The task should not have been on an event list. */
4922 configASSERT( listLIST_ITEM_CONTAINER( &( pxTCB->xEventListItem ) ) == NULL );
4924 #if ( configUSE_TICKLESS_IDLE != 0 )
4926 /* If a task is blocked waiting for a notification then
4927 * xNextTaskUnblockTime might be set to the blocked task's time
4928 * out time. If the task is unblocked for a reason other than
4929 * a timeout xNextTaskUnblockTime is normally left unchanged,
4930 * because it will automatically get reset to a new value when
4931 * the tick count equals xNextTaskUnblockTime. However if
4932 * tickless idling is used it might be more important to enter
4933 * sleep mode at the earliest possible time - so reset
4934 * xNextTaskUnblockTime here to ensure it is updated at the
4935 * earliest possible time. */
4936 prvResetNextTaskUnblockTime();
4940 if( pxTCB->uxPriority > pxCurrentTCB->uxPriority )
4942 /* The notified task has a priority above the currently
4943 * executing task so a yield is required. */
4944 taskYIELD_IF_USING_PREEMPTION();
4948 mtCOVERAGE_TEST_MARKER();
4953 mtCOVERAGE_TEST_MARKER();
4956 taskEXIT_CRITICAL();
4961 #endif /* configUSE_TASK_NOTIFICATIONS */
4962 /*-----------------------------------------------------------*/
4964 #if ( configUSE_TASK_NOTIFICATIONS == 1 )
4966 BaseType_t xTaskGenericNotifyFromISR( TaskHandle_t xTaskToNotify,
4967 UBaseType_t uxIndexToNotify,
4969 eNotifyAction eAction,
4970 uint32_t * pulPreviousNotificationValue,
4971 BaseType_t * pxHigherPriorityTaskWoken )
4974 uint8_t ucOriginalNotifyState;
4975 BaseType_t xReturn = pdPASS;
4976 UBaseType_t uxSavedInterruptStatus;
4978 configASSERT( xTaskToNotify );
4979 configASSERT( uxIndexToNotify < configTASK_NOTIFICATION_ARRAY_ENTRIES );
4981 /* RTOS ports that support interrupt nesting have the concept of a
4982 * maximum system call (or maximum API call) interrupt priority.
4983 * Interrupts that are above the maximum system call priority are keep
4984 * permanently enabled, even when the RTOS kernel is in a critical section,
4985 * but cannot make any calls to FreeRTOS API functions. If configASSERT()
4986 * is defined in FreeRTOSConfig.h then
4987 * portASSERT_IF_INTERRUPT_PRIORITY_INVALID() will result in an assertion
4988 * failure if a FreeRTOS API function is called from an interrupt that has
4989 * been assigned a priority above the configured maximum system call
4990 * priority. Only FreeRTOS functions that end in FromISR can be called
4991 * from interrupts that have been assigned a priority at or (logically)
4992 * below the maximum system call interrupt priority. FreeRTOS maintains a
4993 * separate interrupt safe API to ensure interrupt entry is as fast and as
4994 * simple as possible. More information (albeit Cortex-M specific) is
4995 * provided on the following link:
4996 * https://www.FreeRTOS.org/RTOS-Cortex-M3-M4.html */
4997 portASSERT_IF_INTERRUPT_PRIORITY_INVALID();
4999 pxTCB = xTaskToNotify;
5001 uxSavedInterruptStatus = portSET_INTERRUPT_MASK_FROM_ISR();
5003 if( pulPreviousNotificationValue != NULL )
5005 *pulPreviousNotificationValue = pxTCB->ulNotifiedValue[ uxIndexToNotify ];
5008 ucOriginalNotifyState = pxTCB->ucNotifyState[ uxIndexToNotify ];
5009 pxTCB->ucNotifyState[ uxIndexToNotify ] = taskNOTIFICATION_RECEIVED;
5014 pxTCB->ulNotifiedValue[ uxIndexToNotify ] |= ulValue;
5018 ( pxTCB->ulNotifiedValue[ uxIndexToNotify ] )++;
5021 case eSetValueWithOverwrite:
5022 pxTCB->ulNotifiedValue[ uxIndexToNotify ] = ulValue;
5025 case eSetValueWithoutOverwrite:
5027 if( ucOriginalNotifyState != taskNOTIFICATION_RECEIVED )
5029 pxTCB->ulNotifiedValue[ uxIndexToNotify ] = ulValue;
5033 /* The value could not be written to the task. */
5041 /* The task is being notified without its notify value being
5047 /* Should not get here if all enums are handled.
5048 * Artificially force an assert by testing a value the
5049 * compiler can't assume is const. */
5050 configASSERT( xTickCount == ( TickType_t ) 0 );
5054 traceTASK_NOTIFY_FROM_ISR( uxIndexToNotify );
5056 /* If the task is in the blocked state specifically to wait for a
5057 * notification then unblock it now. */
5058 if( ucOriginalNotifyState == taskWAITING_NOTIFICATION )
5060 /* The task should not have been on an event list. */
5061 configASSERT( listLIST_ITEM_CONTAINER( &( pxTCB->xEventListItem ) ) == NULL );
5063 if( uxSchedulerSuspended == ( UBaseType_t ) pdFALSE )
5065 listREMOVE_ITEM( &( pxTCB->xStateListItem ) );
5066 prvAddTaskToReadyList( pxTCB );
5070 /* The delayed and ready lists cannot be accessed, so hold
5071 * this task pending until the scheduler is resumed. */
5072 listINSERT_END( &( xPendingReadyList ), &( pxTCB->xEventListItem ) );
5075 if( pxTCB->uxPriority > pxCurrentTCB->uxPriority )
5077 /* The notified task has a priority above the currently
5078 * executing task so a yield is required. */
5079 if( pxHigherPriorityTaskWoken != NULL )
5081 *pxHigherPriorityTaskWoken = pdTRUE;
5084 /* Mark that a yield is pending in case the user is not
5085 * using the "xHigherPriorityTaskWoken" parameter to an ISR
5086 * safe FreeRTOS function. */
5087 xYieldPending = pdTRUE;
5091 mtCOVERAGE_TEST_MARKER();
5095 portCLEAR_INTERRUPT_MASK_FROM_ISR( uxSavedInterruptStatus );
5100 #endif /* configUSE_TASK_NOTIFICATIONS */
5101 /*-----------------------------------------------------------*/
5103 #if ( configUSE_TASK_NOTIFICATIONS == 1 )
5105 void vTaskGenericNotifyGiveFromISR( TaskHandle_t xTaskToNotify,
5106 UBaseType_t uxIndexToNotify,
5107 BaseType_t * pxHigherPriorityTaskWoken )
5110 uint8_t ucOriginalNotifyState;
5111 UBaseType_t uxSavedInterruptStatus;
5113 configASSERT( xTaskToNotify );
5114 configASSERT( uxIndexToNotify < configTASK_NOTIFICATION_ARRAY_ENTRIES );
5116 /* RTOS ports that support interrupt nesting have the concept of a
5117 * maximum system call (or maximum API call) interrupt priority.
5118 * Interrupts that are above the maximum system call priority are keep
5119 * permanently enabled, even when the RTOS kernel is in a critical section,
5120 * but cannot make any calls to FreeRTOS API functions. If configASSERT()
5121 * is defined in FreeRTOSConfig.h then
5122 * portASSERT_IF_INTERRUPT_PRIORITY_INVALID() will result in an assertion
5123 * failure if a FreeRTOS API function is called from an interrupt that has
5124 * been assigned a priority above the configured maximum system call
5125 * priority. Only FreeRTOS functions that end in FromISR can be called
5126 * from interrupts that have been assigned a priority at or (logically)
5127 * below the maximum system call interrupt priority. FreeRTOS maintains a
5128 * separate interrupt safe API to ensure interrupt entry is as fast and as
5129 * simple as possible. More information (albeit Cortex-M specific) is
5130 * provided on the following link:
5131 * https://www.FreeRTOS.org/RTOS-Cortex-M3-M4.html */
5132 portASSERT_IF_INTERRUPT_PRIORITY_INVALID();
5134 pxTCB = xTaskToNotify;
5136 uxSavedInterruptStatus = portSET_INTERRUPT_MASK_FROM_ISR();
5138 ucOriginalNotifyState = pxTCB->ucNotifyState[ uxIndexToNotify ];
5139 pxTCB->ucNotifyState[ uxIndexToNotify ] = taskNOTIFICATION_RECEIVED;
5141 /* 'Giving' is equivalent to incrementing a count in a counting
5143 ( pxTCB->ulNotifiedValue[ uxIndexToNotify ] )++;
5145 traceTASK_NOTIFY_GIVE_FROM_ISR( uxIndexToNotify );
5147 /* If the task is in the blocked state specifically to wait for a
5148 * notification then unblock it now. */
5149 if( ucOriginalNotifyState == taskWAITING_NOTIFICATION )
5151 /* The task should not have been on an event list. */
5152 configASSERT( listLIST_ITEM_CONTAINER( &( pxTCB->xEventListItem ) ) == NULL );
5154 if( uxSchedulerSuspended == ( UBaseType_t ) pdFALSE )
5156 listREMOVE_ITEM( &( pxTCB->xStateListItem ) );
5157 prvAddTaskToReadyList( pxTCB );
5161 /* The delayed and ready lists cannot be accessed, so hold
5162 * this task pending until the scheduler is resumed. */
5163 listINSERT_END( &( xPendingReadyList ), &( pxTCB->xEventListItem ) );
5166 if( pxTCB->uxPriority > pxCurrentTCB->uxPriority )
5168 /* The notified task has a priority above the currently
5169 * executing task so a yield is required. */
5170 if( pxHigherPriorityTaskWoken != NULL )
5172 *pxHigherPriorityTaskWoken = pdTRUE;
5175 /* Mark that a yield is pending in case the user is not
5176 * using the "xHigherPriorityTaskWoken" parameter in an ISR
5177 * safe FreeRTOS function. */
5178 xYieldPending = pdTRUE;
5182 mtCOVERAGE_TEST_MARKER();
5186 portCLEAR_INTERRUPT_MASK_FROM_ISR( uxSavedInterruptStatus );
5189 #endif /* configUSE_TASK_NOTIFICATIONS */
5190 /*-----------------------------------------------------------*/
5192 #if ( configUSE_TASK_NOTIFICATIONS == 1 )
5194 BaseType_t xTaskGenericNotifyStateClear( TaskHandle_t xTask,
5195 UBaseType_t uxIndexToClear )
5200 configASSERT( uxIndexToClear < configTASK_NOTIFICATION_ARRAY_ENTRIES );
5202 /* If null is passed in here then it is the calling task that is having
5203 * its notification state cleared. */
5204 pxTCB = prvGetTCBFromHandle( xTask );
5206 taskENTER_CRITICAL();
5208 if( pxTCB->ucNotifyState[ uxIndexToClear ] == taskNOTIFICATION_RECEIVED )
5210 pxTCB->ucNotifyState[ uxIndexToClear ] = taskNOT_WAITING_NOTIFICATION;
5218 taskEXIT_CRITICAL();
5223 #endif /* configUSE_TASK_NOTIFICATIONS */
5224 /*-----------------------------------------------------------*/
5226 #if ( configUSE_TASK_NOTIFICATIONS == 1 )
5228 uint32_t ulTaskGenericNotifyValueClear( TaskHandle_t xTask,
5229 UBaseType_t uxIndexToClear,
5230 uint32_t ulBitsToClear )
5235 /* If null is passed in here then it is the calling task that is having
5236 * its notification state cleared. */
5237 pxTCB = prvGetTCBFromHandle( xTask );
5239 taskENTER_CRITICAL();
5241 /* Return the notification as it was before the bits were cleared,
5242 * then clear the bit mask. */
5243 ulReturn = pxTCB->ulNotifiedValue[ uxIndexToClear ];
5244 pxTCB->ulNotifiedValue[ uxIndexToClear ] &= ~ulBitsToClear;
5246 taskEXIT_CRITICAL();
5251 #endif /* configUSE_TASK_NOTIFICATIONS */
5252 /*-----------------------------------------------------------*/
5254 #if ( ( configGENERATE_RUN_TIME_STATS == 1 ) && ( INCLUDE_xTaskGetIdleTaskHandle == 1 ) )
5256 configRUN_TIME_COUNTER_TYPE ulTaskGetIdleRunTimeCounter( void )
5258 return xIdleTaskHandle->ulRunTimeCounter;
5262 /*-----------------------------------------------------------*/
5264 #if ( ( configGENERATE_RUN_TIME_STATS == 1 ) && ( INCLUDE_xTaskGetIdleTaskHandle == 1 ) )
5266 configRUN_TIME_COUNTER_TYPE ulTaskGetIdleRunTimePercent( void )
5268 configRUN_TIME_COUNTER_TYPE ulTotalTime, ulReturn;
5270 ulTotalTime = portGET_RUN_TIME_COUNTER_VALUE();
5272 /* For percentage calculations. */
5273 ulTotalTime /= ( configRUN_TIME_COUNTER_TYPE ) 100;
5275 /* Avoid divide by zero errors. */
5276 if( ulTotalTime > ( configRUN_TIME_COUNTER_TYPE ) 0 )
5278 ulReturn = xIdleTaskHandle->ulRunTimeCounter / ulTotalTime;
5288 #endif /* if ( ( configGENERATE_RUN_TIME_STATS == 1 ) && ( INCLUDE_xTaskGetIdleTaskHandle == 1 ) ) */
5289 /*-----------------------------------------------------------*/
5291 static void prvAddCurrentTaskToDelayedList( TickType_t xTicksToWait,
5292 const BaseType_t xCanBlockIndefinitely )
5294 TickType_t xTimeToWake;
5295 const TickType_t xConstTickCount = xTickCount;
5297 #if ( INCLUDE_xTaskAbortDelay == 1 )
5299 /* About to enter a delayed list, so ensure the ucDelayAborted flag is
5300 * reset to pdFALSE so it can be detected as having been set to pdTRUE
5301 * when the task leaves the Blocked state. */
5302 pxCurrentTCB->ucDelayAborted = pdFALSE;
5306 /* Remove the task from the ready list before adding it to the blocked list
5307 * as the same list item is used for both lists. */
5308 if( uxListRemove( &( pxCurrentTCB->xStateListItem ) ) == ( UBaseType_t ) 0 )
5310 /* The current task must be in a ready list, so there is no need to
5311 * check, and the port reset macro can be called directly. */
5312 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. */
5316 mtCOVERAGE_TEST_MARKER();
5319 #if ( INCLUDE_vTaskSuspend == 1 )
5321 if( ( xTicksToWait == portMAX_DELAY ) && ( xCanBlockIndefinitely != pdFALSE ) )
5323 /* Add the task to the suspended task list instead of a delayed task
5324 * list to ensure it is not woken by a timing event. It will block
5326 listINSERT_END( &xSuspendedTaskList, &( pxCurrentTCB->xStateListItem ) );
5330 /* Calculate the time at which the task should be woken if the event
5331 * does not occur. This may overflow but this doesn't matter, the
5332 * kernel will manage it correctly. */
5333 xTimeToWake = xConstTickCount + xTicksToWait;
5335 /* The list item will be inserted in wake time order. */
5336 listSET_LIST_ITEM_VALUE( &( pxCurrentTCB->xStateListItem ), xTimeToWake );
5338 if( xTimeToWake < xConstTickCount )
5340 /* Wake time has overflowed. Place this item in the overflow
5342 vListInsert( pxOverflowDelayedTaskList, &( pxCurrentTCB->xStateListItem ) );
5346 /* The wake time has not overflowed, so the current block list
5348 vListInsert( pxDelayedTaskList, &( pxCurrentTCB->xStateListItem ) );
5350 /* If the task entering the blocked state was placed at the
5351 * head of the list of blocked tasks then xNextTaskUnblockTime
5352 * needs to be updated too. */
5353 if( xTimeToWake < xNextTaskUnblockTime )
5355 xNextTaskUnblockTime = xTimeToWake;
5359 mtCOVERAGE_TEST_MARKER();
5364 #else /* INCLUDE_vTaskSuspend */
5366 /* Calculate the time at which the task should be woken if the event
5367 * does not occur. This may overflow but this doesn't matter, the kernel
5368 * will manage it correctly. */
5369 xTimeToWake = xConstTickCount + xTicksToWait;
5371 /* The list item will be inserted in wake time order. */
5372 listSET_LIST_ITEM_VALUE( &( pxCurrentTCB->xStateListItem ), xTimeToWake );
5374 if( xTimeToWake < xConstTickCount )
5376 /* Wake time has overflowed. Place this item in the overflow list. */
5377 vListInsert( pxOverflowDelayedTaskList, &( pxCurrentTCB->xStateListItem ) );
5381 /* The wake time has not overflowed, so the current block list is used. */
5382 vListInsert( pxDelayedTaskList, &( pxCurrentTCB->xStateListItem ) );
5384 /* If the task entering the blocked state was placed at the head of the
5385 * list of blocked tasks then xNextTaskUnblockTime needs to be updated
5387 if( xTimeToWake < xNextTaskUnblockTime )
5389 xNextTaskUnblockTime = xTimeToWake;
5393 mtCOVERAGE_TEST_MARKER();
5397 /* Avoid compiler warning when INCLUDE_vTaskSuspend is not 1. */
5398 ( void ) xCanBlockIndefinitely;
5400 #endif /* INCLUDE_vTaskSuspend */
5403 /* Code below here allows additional code to be inserted into this source file,
5404 * especially where access to file scope functions and data is needed (for example
5405 * when performing module tests). */
5407 #ifdef FREERTOS_MODULE_TEST
5408 #include "tasks_test_access_functions.h"
5412 #if ( configINCLUDE_FREERTOS_TASK_C_ADDITIONS_H == 1 )
5414 #include "freertos_tasks_c_additions.h"
5416 #ifdef FREERTOS_TASKS_C_ADDITIONS_INIT
5417 static void freertos_tasks_c_additions_init( void )
5419 FREERTOS_TASKS_C_ADDITIONS_INIT();
5423 #endif /* if ( configINCLUDE_FREERTOS_TASK_C_ADDITIONS_H == 1 ) */