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- /*
- * FreeRTOS Kernel V10.0.1
- * Copyright (C) 2017 Amazon.com, Inc. or its affiliates. All Rights Reserved.
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy of
- * this software and associated documentation files (the "Software"), to deal in
- * the Software without restriction, including without limitation the rights to
- * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
- * the Software, and to permit persons to whom the Software is furnished to do so,
- * subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in all
- * copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
- * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
- * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
- * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
- * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
- *
- * http://www.FreeRTOS.org
- * http://aws.amazon.com/freertos
- *
- * 1 tab == 4 spaces!
- */
- /* Standard includes. */
- #include <stdlib.h>
- #include <string.h>
- /* Defining MPU_WRAPPERS_INCLUDED_FROM_API_FILE prevents task.h from redefining
- all the API functions to use the MPU wrappers. That should only be done when
- task.h is included from an application file. */
- #define MPU_WRAPPERS_INCLUDED_FROM_API_FILE
- /* FreeRTOS includes. */
- #include "FreeRTOS.h"
- #include "task.h"
- #include "timers.h"
- #include "stack_macros.h"
- /* Lint e961 and e750 are suppressed as a MISRA exception justified because the
- MPU ports require MPU_WRAPPERS_INCLUDED_FROM_API_FILE to be defined for the
- header files above, but not in this file, in order to generate the correct
- privileged Vs unprivileged linkage and placement. */
- #undef MPU_WRAPPERS_INCLUDED_FROM_API_FILE /*lint !e961 !e750. */
- /* Set configUSE_STATS_FORMATTING_FUNCTIONS to 2 to include the stats formatting
- functions but without including stdio.h here. */
- #if ( configUSE_STATS_FORMATTING_FUNCTIONS == 1 )
- /* At the bottom of this file are two optional functions that can be used
- to generate human readable text from the raw data generated by the
- uxTaskGetSystemState() function. Note the formatting functions are provided
- for convenience only, and are NOT considered part of the kernel. */
- #include <stdio.h>
- #endif /* configUSE_STATS_FORMATTING_FUNCTIONS == 1 ) */
- #if( configUSE_PREEMPTION == 0 )
- /* If the cooperative scheduler is being used then a yield should not be
- performed just because a higher priority task has been woken. */
- #define taskYIELD_IF_USING_PREEMPTION()
- #else
- #define taskYIELD_IF_USING_PREEMPTION() portYIELD_WITHIN_API()
- #endif
- /* Values that can be assigned to the ucNotifyState member of the TCB. */
- #define taskNOT_WAITING_NOTIFICATION ( ( uint8_t ) 0 )
- #define taskWAITING_NOTIFICATION ( ( uint8_t ) 1 )
- #define taskNOTIFICATION_RECEIVED ( ( uint8_t ) 2 )
- /*
- * The value used to fill the stack of a task when the task is created. This
- * is used purely for checking the high water mark for tasks.
- */
- #define tskSTACK_FILL_BYTE ( 0xa5U )
- /* Sometimes the FreeRTOSConfig.h settings only allow a task to be created using
- dynamically allocated RAM, in which case when any task is deleted it is known
- that both the task's stack and TCB need to be freed. Sometimes the
- FreeRTOSConfig.h settings only allow a task to be created using statically
- allocated RAM, in which case when any task is deleted it is known that neither
- the task's stack or TCB should be freed. Sometimes the FreeRTOSConfig.h
- settings allow a task to be created using either statically or dynamically
- allocated RAM, in which case a member of the TCB is used to record whether the
- stack and/or TCB were allocated statically or dynamically, so when a task is
- deleted the RAM that was allocated dynamically is freed again and no attempt is
- made to free the RAM that was allocated statically.
- tskSTATIC_AND_DYNAMIC_ALLOCATION_POSSIBLE is only true if it is possible for a
- task to be created using either statically or dynamically allocated RAM. Note
- that if portUSING_MPU_WRAPPERS is 1 then a protected task can be created with
- a statically allocated stack and a dynamically allocated TCB.
- !!!NOTE!!! If the definition of tskSTATIC_AND_DYNAMIC_ALLOCATION_POSSIBLE is
- changed then the definition of StaticTask_t must also be updated. */
- #define tskSTATIC_AND_DYNAMIC_ALLOCATION_POSSIBLE ( ( configSUPPORT_STATIC_ALLOCATION == 1 ) && ( configSUPPORT_DYNAMIC_ALLOCATION == 1 ) )
- #define tskDYNAMICALLY_ALLOCATED_STACK_AND_TCB ( ( uint8_t ) 0 )
- #define tskSTATICALLY_ALLOCATED_STACK_ONLY ( ( uint8_t ) 1 )
- #define tskSTATICALLY_ALLOCATED_STACK_AND_TCB ( ( uint8_t ) 2 )
- /* If any of the following are set then task stacks are filled with a known
- value so the high water mark can be determined. If none of the following are
- set then don't fill the stack so there is no unnecessary dependency on memset. */
- #if( ( configCHECK_FOR_STACK_OVERFLOW > 1 ) || ( configUSE_TRACE_FACILITY == 1 ) || ( INCLUDE_uxTaskGetStackHighWaterMark == 1 ) )
- #define tskSET_NEW_STACKS_TO_KNOWN_VALUE 1
- #else
- #define tskSET_NEW_STACKS_TO_KNOWN_VALUE 0
- #endif
- /*
- * Macros used by vListTask to indicate which state a task is in.
- */
- #define tskRUNNING_CHAR ( 'X' )
- #define tskBLOCKED_CHAR ( 'B' )
- #define tskREADY_CHAR ( 'R' )
- #define tskDELETED_CHAR ( 'D' )
- #define tskSUSPENDED_CHAR ( 'S' )
- /*
- * Some kernel aware debuggers require the data the debugger needs access to be
- * global, rather than file scope.
- */
- #ifdef portREMOVE_STATIC_QUALIFIER
- #define static
- #endif
- /* The name allocated to the Idle task. This can be overridden by defining
- configIDLE_TASK_NAME in FreeRTOSConfig.h. */
- #ifndef configIDLE_TASK_NAME
- #define configIDLE_TASK_NAME "IDLE"
- #endif
- #if ( configUSE_PORT_OPTIMISED_TASK_SELECTION == 0 )
- /* If configUSE_PORT_OPTIMISED_TASK_SELECTION is 0 then task selection is
- performed in a generic way that is not optimised to any particular
- microcontroller architecture. */
- /* uxTopReadyPriority holds the priority of the highest priority ready
- state task. */
- #define taskRECORD_READY_PRIORITY( uxPriority ) \
- { \
- if( ( uxPriority ) > uxTopReadyPriority ) \
- { \
- uxTopReadyPriority = ( uxPriority ); \
- } \
- } /* taskRECORD_READY_PRIORITY */
- /*-----------------------------------------------------------*/
- #define taskSELECT_HIGHEST_PRIORITY_TASK() \
- { \
- UBaseType_t uxTopPriority = uxTopReadyPriority; \
- \
- /* Find the highest priority queue that contains ready tasks. */ \
- while( listLIST_IS_EMPTY( &( pxReadyTasksLists[ uxTopPriority ] ) ) ) \
- { \
- configASSERT( uxTopPriority ); \
- --uxTopPriority; \
- } \
- \
- /* listGET_OWNER_OF_NEXT_ENTRY indexes through the list, so the tasks of \
- the same priority get an equal share of the processor time. */ \
- listGET_OWNER_OF_NEXT_ENTRY( pxCurrentTCB, &( pxReadyTasksLists[ uxTopPriority ] ) ); \
- uxTopReadyPriority = uxTopPriority; \
- } /* taskSELECT_HIGHEST_PRIORITY_TASK */
- /*-----------------------------------------------------------*/
- /* Define away taskRESET_READY_PRIORITY() and portRESET_READY_PRIORITY() as
- they are only required when a port optimised method of task selection is
- being used. */
- #define taskRESET_READY_PRIORITY( uxPriority )
- #define portRESET_READY_PRIORITY( uxPriority, uxTopReadyPriority )
- #else /* configUSE_PORT_OPTIMISED_TASK_SELECTION */
- /* If configUSE_PORT_OPTIMISED_TASK_SELECTION is 1 then task selection is
- performed in a way that is tailored to the particular microcontroller
- architecture being used. */
- /* A port optimised version is provided. Call the port defined macros. */
- #define taskRECORD_READY_PRIORITY( uxPriority ) portRECORD_READY_PRIORITY( uxPriority, uxTopReadyPriority )
- /*-----------------------------------------------------------*/
- #define taskSELECT_HIGHEST_PRIORITY_TASK() \
- { \
- UBaseType_t uxTopPriority; \
- \
- /* Find the highest priority list that contains ready tasks. */ \
- portGET_HIGHEST_PRIORITY( uxTopPriority, uxTopReadyPriority ); \
- configASSERT( listCURRENT_LIST_LENGTH( &( pxReadyTasksLists[ uxTopPriority ] ) ) > 0 ); \
- listGET_OWNER_OF_NEXT_ENTRY( pxCurrentTCB, &( pxReadyTasksLists[ uxTopPriority ] ) ); \
- } /* taskSELECT_HIGHEST_PRIORITY_TASK() */
- /*-----------------------------------------------------------*/
- /* A port optimised version is provided, call it only if the TCB being reset
- is being referenced from a ready list. If it is referenced from a delayed
- or suspended list then it won't be in a ready list. */
- #define taskRESET_READY_PRIORITY( uxPriority ) \
- { \
- if( listCURRENT_LIST_LENGTH( &( pxReadyTasksLists[ ( uxPriority ) ] ) ) == ( UBaseType_t ) 0 ) \
- { \
- portRESET_READY_PRIORITY( ( uxPriority ), ( uxTopReadyPriority ) ); \
- } \
- }
- #endif /* configUSE_PORT_OPTIMISED_TASK_SELECTION */
- /*-----------------------------------------------------------*/
- /* pxDelayedTaskList and pxOverflowDelayedTaskList are switched when the tick
- count overflows. */
- #define taskSWITCH_DELAYED_LISTS() \
- { \
- List_t *pxTemp; \
- \
- /* The delayed tasks list should be empty when the lists are switched. */ \
- configASSERT( ( listLIST_IS_EMPTY( pxDelayedTaskList ) ) ); \
- \
- pxTemp = pxDelayedTaskList; \
- pxDelayedTaskList = pxOverflowDelayedTaskList; \
- pxOverflowDelayedTaskList = pxTemp; \
- xNumOfOverflows++; \
- prvResetNextTaskUnblockTime(); \
- }
- /*-----------------------------------------------------------*/
- /*
- * Place the task represented by pxTCB into the appropriate ready list for
- * the task. It is inserted at the end of the list.
- */
- #define prvAddTaskToReadyList( pxTCB ) \
- traceMOVED_TASK_TO_READY_STATE( pxTCB ); \
- taskRECORD_READY_PRIORITY( ( pxTCB )->uxPriority ); \
- vListInsertEnd( &( pxReadyTasksLists[ ( pxTCB )->uxPriority ] ), &( ( pxTCB )->xStateListItem ) ); \
- tracePOST_MOVED_TASK_TO_READY_STATE( pxTCB )
- /*-----------------------------------------------------------*/
- /*
- * Several functions take an TaskHandle_t parameter that can optionally be NULL,
- * where NULL is used to indicate that the handle of the currently executing
- * task should be used in place of the parameter. This macro simply checks to
- * see if the parameter is NULL and returns a pointer to the appropriate TCB.
- */
- #define prvGetTCBFromHandle( pxHandle ) ( ( ( pxHandle ) == NULL ) ? ( TCB_t * ) pxCurrentTCB : ( TCB_t * ) ( pxHandle ) )
- /* The item value of the event list item is normally used to hold the priority
- of the task to which it belongs (coded to allow it to be held in reverse
- priority order). However, it is occasionally borrowed for other purposes. It
- is important its value is not updated due to a task priority change while it is
- being used for another purpose. The following bit definition is used to inform
- the scheduler that the value should not be changed - in which case it is the
- responsibility of whichever module is using the value to ensure it gets set back
- to its original value when it is released. */
- #if( configUSE_16_BIT_TICKS == 1 )
- #define taskEVENT_LIST_ITEM_VALUE_IN_USE 0x8000U
- #else
- #define taskEVENT_LIST_ITEM_VALUE_IN_USE 0x80000000UL
- #endif
- /*
- * Task control block. A task control block (TCB) is allocated for each task,
- * and stores task state information, including a pointer to the task's context
- * (the task's run time environment, including register values)
- */
- typedef struct tskTaskControlBlock
- {
- 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. */
- #if ( portUSING_MPU_WRAPPERS == 1 )
- xMPU_SETTINGS xMPUSettings; /*< The MPU settings are defined as part of the port layer. THIS MUST BE THE SECOND MEMBER OF THE TCB STRUCT. */
- #endif
- 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 ). */
- ListItem_t xEventListItem; /*< Used to reference a task from an event list. */
- UBaseType_t uxPriority; /*< The priority of the task. 0 is the lowest priority. */
- StackType_t *pxStack; /*< Points to the start of the stack. */
- 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. */
- #if ( ( portSTACK_GROWTH > 0 ) || ( configRECORD_STACK_HIGH_ADDRESS == 1 ) )
- StackType_t *pxEndOfStack; /*< Points to the highest valid address for the stack. */
- #endif
- #if ( portCRITICAL_NESTING_IN_TCB == 1 )
- UBaseType_t uxCriticalNesting; /*< Holds the critical section nesting depth for ports that do not maintain their own count in the port layer. */
- #endif
- #if ( configUSE_TRACE_FACILITY == 1 )
- 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. */
- UBaseType_t uxTaskNumber; /*< Stores a number specifically for use by third party trace code. */
- #endif
- #if ( configUSE_MUTEXES == 1 )
- UBaseType_t uxBasePriority; /*< The priority last assigned to the task - used by the priority inheritance mechanism. */
- UBaseType_t uxMutexesHeld;
- #endif
- #if ( configUSE_APPLICATION_TASK_TAG == 1 )
- TaskHookFunction_t pxTaskTag;
- #endif
- #if( configNUM_THREAD_LOCAL_STORAGE_POINTERS > 0 )
- void *pvThreadLocalStoragePointers[ configNUM_THREAD_LOCAL_STORAGE_POINTERS ];
- #endif
- #if( configGENERATE_RUN_TIME_STATS == 1 )
- uint32_t ulRunTimeCounter; /*< Stores the amount of time the task has spent in the Running state. */
- #endif
- #if ( configUSE_NEWLIB_REENTRANT == 1 )
- /* Allocate a Newlib reent structure that is specific to this task.
- Note Newlib support has been included by popular demand, but is not
- used by the FreeRTOS maintainers themselves. FreeRTOS is not
- responsible for resulting newlib operation. User must be familiar with
- newlib and must provide system-wide implementations of the necessary
- stubs. Be warned that (at the time of writing) the current newlib design
- implements a system-wide malloc() that must be provided with locks. */
- struct _reent xNewLib_reent;
- #endif
- #if( configUSE_TASK_NOTIFICATIONS == 1 )
- volatile uint32_t ulNotifiedValue;
- volatile uint8_t ucNotifyState;
- #endif
- /* See the comments above the definition of
- tskSTATIC_AND_DYNAMIC_ALLOCATION_POSSIBLE. */
- #if( tskSTATIC_AND_DYNAMIC_ALLOCATION_POSSIBLE != 0 ) /*lint !e731 Macro has been consolidated for readability reasons. */
- uint8_t ucStaticallyAllocated; /*< Set to pdTRUE if the task is a statically allocated to ensure no attempt is made to free the memory. */
- #endif
- #if( INCLUDE_xTaskAbortDelay == 1 )
- uint8_t ucDelayAborted;
- #endif
- } tskTCB;
- /* The old tskTCB name is maintained above then typedefed to the new TCB_t name
- below to enable the use of older kernel aware debuggers. */
- typedef tskTCB TCB_t;
- /*lint -save -e956 A manual analysis and inspection has been used to determine
- which static variables must be declared volatile. */
- PRIVILEGED_DATA TCB_t * volatile pxCurrentTCB = NULL;
- /* Lists for ready and blocked tasks. --------------------*/
- PRIVILEGED_DATA static List_t pxReadyTasksLists[ configMAX_PRIORITIES ] = {0}; /*< Prioritised ready tasks. */
- PRIVILEGED_DATA static List_t xDelayedTaskList1 = {0}; /*< Delayed tasks. */
- PRIVILEGED_DATA static List_t xDelayedTaskList2 = {0}; /*< Delayed tasks (two lists are used - one for delays that have overflowed the current tick count. */
- PRIVILEGED_DATA static List_t * volatile pxDelayedTaskList = NULL; /*< Points to the delayed task list currently being used. */
- PRIVILEGED_DATA static List_t * volatile pxOverflowDelayedTaskList = NULL; /*< Points to the delayed task list currently being used to hold tasks that have overflowed the current tick count. */
- PRIVILEGED_DATA static List_t xPendingReadyList = {0}; /*< Tasks that have been readied while the scheduler was suspended. They will be moved to the ready list when the scheduler is resumed. */
- #if( INCLUDE_vTaskDelete == 1 )
- PRIVILEGED_DATA static List_t xTasksWaitingTermination = {0}; /*< Tasks that have been deleted - but their memory not yet freed. */
- PRIVILEGED_DATA static volatile UBaseType_t uxDeletedTasksWaitingCleanUp = ( UBaseType_t ) 0U;
- #endif
- #if ( INCLUDE_vTaskSuspend == 1 )
- PRIVILEGED_DATA static List_t xSuspendedTaskList = {0}; /*< Tasks that are currently suspended. */
- #endif
- /* Other file private variables. --------------------------------*/
- PRIVILEGED_DATA static volatile UBaseType_t uxCurrentNumberOfTasks = ( UBaseType_t ) 0U;
- PRIVILEGED_DATA static volatile TickType_t xTickCount = ( TickType_t ) configINITIAL_TICK_COUNT;
- PRIVILEGED_DATA static volatile UBaseType_t uxTopReadyPriority = tskIDLE_PRIORITY;
- PRIVILEGED_DATA static volatile BaseType_t xSchedulerRunning = pdFALSE;
- PRIVILEGED_DATA static volatile UBaseType_t uxPendedTicks = ( UBaseType_t ) 0U;
- PRIVILEGED_DATA static volatile BaseType_t xYieldPending = pdFALSE;
- PRIVILEGED_DATA static volatile BaseType_t xNumOfOverflows = ( BaseType_t ) 0;
- PRIVILEGED_DATA static UBaseType_t uxTaskNumber = ( UBaseType_t ) 0U;
- PRIVILEGED_DATA static volatile TickType_t xNextTaskUnblockTime = ( TickType_t ) 0U; /* Initialised to portMAX_DELAY before the scheduler starts. */
- 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. */
- /* Context switches are held pending while the scheduler is suspended. Also,
- interrupts must not manipulate the xStateListItem of a TCB, or any of the
- lists the xStateListItem can be referenced from, if the scheduler is suspended.
- If an interrupt needs to unblock a task while the scheduler is suspended then it
- moves the task's event list item into the xPendingReadyList, ready for the
- kernel to move the task from the pending ready list into the real ready list
- when the scheduler is unsuspended. The pending ready list itself can only be
- accessed from a critical section. */
- PRIVILEGED_DATA static volatile UBaseType_t uxSchedulerSuspended = ( UBaseType_t ) pdFALSE;
- #if ( configGENERATE_RUN_TIME_STATS == 1 )
- PRIVILEGED_DATA static uint32_t ulTaskSwitchedInTime = 0UL; /*< Holds the value of a timer/counter the last time a task was switched in. */
- PRIVILEGED_DATA static uint32_t ulTotalRunTime = 0UL; /*< Holds the total amount of execution time as defined by the run time counter clock. */
- #endif
- /*lint -restore */
- /*-----------------------------------------------------------*/
- /* Callback function prototypes. --------------------------*/
- #if( configCHECK_FOR_STACK_OVERFLOW > 0 )
- extern void vApplicationStackOverflowHook( TaskHandle_t xTask, char *pcTaskName );
- #endif
- #if( configUSE_TICK_HOOK > 0 )
- extern void vApplicationTickHook( void );
- #endif
- #if( configSUPPORT_STATIC_ALLOCATION == 1 )
- extern void vApplicationGetIdleTaskMemory( StaticTask_t **ppxIdleTaskTCBBuffer, StackType_t **ppxIdleTaskStackBuffer, uint32_t *pulIdleTaskStackSize );
- #endif
- /* File private functions. --------------------------------*/
- /**
- * Utility task that simply returns pdTRUE if the task referenced by xTask is
- * currently in the Suspended state, or pdFALSE if the task referenced by xTask
- * is in any other state.
- */
- #if ( INCLUDE_vTaskSuspend == 1 )
- static BaseType_t prvTaskIsTaskSuspended( const TaskHandle_t xTask ) PRIVILEGED_FUNCTION;
- #endif /* INCLUDE_vTaskSuspend */
- /*
- * Utility to ready all the lists used by the scheduler. This is called
- * automatically upon the creation of the first task.
- */
- static void prvInitialiseTaskLists( void ) PRIVILEGED_FUNCTION;
- /*
- * The idle task, which as all tasks is implemented as a never ending loop.
- * The idle task is automatically created and added to the ready lists upon
- * creation of the first user task.
- *
- * The portTASK_FUNCTION_PROTO() macro is used to allow port/compiler specific
- * language extensions. The equivalent prototype for this function is:
- *
- * void prvIdleTask( void *pvParameters );
- *
- */
- static portTASK_FUNCTION_PROTO( prvIdleTask, pvParameters );
- /*
- * Utility to free all memory allocated by the scheduler to hold a TCB,
- * including the stack pointed to by the TCB.
- *
- * This does not free memory allocated by the task itself (i.e. memory
- * allocated by calls to pvPortMalloc from within the tasks application code).
- */
- #if ( INCLUDE_vTaskDelete == 1 )
- static void prvDeleteTCB( TCB_t *pxTCB ) PRIVILEGED_FUNCTION;
- #endif
- /*
- * Used only by the idle task. This checks to see if anything has been placed
- * in the list of tasks waiting to be deleted. If so the task is cleaned up
- * and its TCB deleted.
- */
- static void prvCheckTasksWaitingTermination( void ) PRIVILEGED_FUNCTION;
- /*
- * The currently executing task is entering the Blocked state. Add the task to
- * either the current or the overflow delayed task list.
- */
- static void prvAddCurrentTaskToDelayedList( TickType_t xTicksToWait, const BaseType_t xCanBlockIndefinitely ) PRIVILEGED_FUNCTION;
- /*
- * Fills an TaskStatus_t structure with information on each task that is
- * referenced from the pxList list (which may be a ready list, a delayed list,
- * a suspended list, etc.).
- *
- * THIS FUNCTION IS INTENDED FOR DEBUGGING ONLY, AND SHOULD NOT BE CALLED FROM
- * NORMAL APPLICATION CODE.
- */
- #if ( configUSE_TRACE_FACILITY == 1 )
- static UBaseType_t prvListTasksWithinSingleList( TaskStatus_t *pxTaskStatusArray, List_t *pxList, eTaskState eState ) PRIVILEGED_FUNCTION;
- #endif
- /*
- * Searches pxList for a task with name pcNameToQuery - returning a handle to
- * the task if it is found, or NULL if the task is not found.
- */
- #if ( INCLUDE_xTaskGetHandle == 1 )
- static TCB_t *prvSearchForNameWithinSingleList( List_t *pxList, const char pcNameToQuery[] ) PRIVILEGED_FUNCTION;
- #endif
- /*
- * When a task is created, the stack of the task is filled with a known value.
- * This function determines the 'high water mark' of the task stack by
- * determining how much of the stack remains at the original preset value.
- */
- #if ( ( configUSE_TRACE_FACILITY == 1 ) || ( INCLUDE_uxTaskGetStackHighWaterMark == 1 ) )
- static uint16_t prvTaskCheckFreeStackSpace( const uint8_t * pucStackByte ) PRIVILEGED_FUNCTION;
- #endif
- /*
- * Return the amount of time, in ticks, that will pass before the kernel will
- * next move a task from the Blocked state to the Running state.
- *
- * This conditional compilation should use inequality to 0, not equality to 1.
- * This is to ensure portSUPPRESS_TICKS_AND_SLEEP() can be called when user
- * defined low power mode implementations require configUSE_TICKLESS_IDLE to be
- * set to a value other than 1.
- */
- #if ( configUSE_TICKLESS_IDLE != 0 )
- static TickType_t prvGetExpectedIdleTime( void ) PRIVILEGED_FUNCTION;
- #endif
- /*
- * Set xNextTaskUnblockTime to the time at which the next Blocked state task
- * will exit the Blocked state.
- */
- static void prvResetNextTaskUnblockTime( void );
- #if ( ( configUSE_TRACE_FACILITY == 1 ) && ( configUSE_STATS_FORMATTING_FUNCTIONS > 0 ) )
- /*
- * Helper function used to pad task names with spaces when printing out
- * human readable tables of task information.
- */
- static char *prvWriteNameToBuffer( char *pcBuffer, const char *pcTaskName ) PRIVILEGED_FUNCTION;
- #endif
- /*
- * Called after a Task_t structure has been allocated either statically or
- * dynamically to fill in the structure's members.
- */
- static void prvInitialiseNewTask( TaskFunction_t pxTaskCode,
- const char * const pcName, /*lint !e971 Unqualified char types are allowed for strings and single characters only. */
- const uint32_t ulStackDepth,
- void * const pvParameters,
- UBaseType_t uxPriority,
- TaskHandle_t * const pxCreatedTask,
- TCB_t *pxNewTCB,
- const MemoryRegion_t * const xRegions ) PRIVILEGED_FUNCTION;
- /*
- * Called after a new task has been created and initialised to place the task
- * under the control of the scheduler.
- */
- static void prvAddNewTaskToReadyList( TCB_t *pxNewTCB ) PRIVILEGED_FUNCTION;
- /*
- * freertos_tasks_c_additions_init() should only be called if the user definable
- * macro FREERTOS_TASKS_C_ADDITIONS_INIT() is defined, as that is the only macro
- * called by the function.
- */
- #ifdef FREERTOS_TASKS_C_ADDITIONS_INIT
- static void freertos_tasks_c_additions_init( void ) PRIVILEGED_FUNCTION;
- #endif
- /*-----------------------------------------------------------*/
- #if( configSUPPORT_STATIC_ALLOCATION == 1 )
- TaskHandle_t xTaskCreateStatic( TaskFunction_t pxTaskCode,
- const char * const pcName, /*lint !e971 Unqualified char types are allowed for strings and single characters only. */
- const uint32_t ulStackDepth,
- void * const pvParameters,
- UBaseType_t uxPriority,
- StackType_t * const puxStackBuffer,
- StaticTask_t * const pxTaskBuffer )
- {
- TCB_t *pxNewTCB;
- TaskHandle_t xReturn;
- configASSERT( puxStackBuffer != NULL );
- configASSERT( pxTaskBuffer != NULL );
- #if( configASSERT_DEFINED == 1 )
- {
- /* Sanity check that the size of the structure used to declare a
- variable of type StaticTask_t equals the size of the real task
- structure. */
- volatile size_t xSize = sizeof( StaticTask_t );
- configASSERT( xSize == sizeof( TCB_t ) );
- }
- #endif /* configASSERT_DEFINED */
- if( ( pxTaskBuffer != NULL ) && ( puxStackBuffer != NULL ) )
- {
- /* The memory used for the task's TCB and stack are passed into this
- function - use them. */
- pxNewTCB = ( TCB_t * ) pxTaskBuffer; /*lint !e740 Unusual cast is ok as the structures are designed to have the same alignment, and the size is checked by an assert. */
- pxNewTCB->pxStack = ( StackType_t * ) puxStackBuffer;
- #if( tskSTATIC_AND_DYNAMIC_ALLOCATION_POSSIBLE != 0 ) /*lint !e731 Macro has been consolidated for readability reasons. */
- {
- /* Tasks can be created statically or dynamically, so note this
- task was created statically in case the task is later deleted. */
- pxNewTCB->ucStaticallyAllocated = tskSTATICALLY_ALLOCATED_STACK_AND_TCB;
- }
- #endif /* configSUPPORT_DYNAMIC_ALLOCATION */
- prvInitialiseNewTask( pxTaskCode, pcName, ulStackDepth, pvParameters, uxPriority, &xReturn, pxNewTCB, NULL );
- prvAddNewTaskToReadyList( pxNewTCB );
- }
- else
- {
- xReturn = NULL;
- }
- return xReturn;
- }
- #endif /* SUPPORT_STATIC_ALLOCATION */
- /*-----------------------------------------------------------*/
- #if( ( portUSING_MPU_WRAPPERS == 1 ) && ( configSUPPORT_STATIC_ALLOCATION == 1 ) )
- BaseType_t xTaskCreateRestrictedStatic( const TaskParameters_t * const pxTaskDefinition, TaskHandle_t *pxCreatedTask )
- {
- TCB_t *pxNewTCB;
- BaseType_t xReturn = errCOULD_NOT_ALLOCATE_REQUIRED_MEMORY;
- configASSERT( pxTaskDefinition->puxStackBuffer != NULL );
- configASSERT( pxTaskDefinition->pxTaskBuffer != NULL );
- if( ( pxTaskDefinition->puxStackBuffer != NULL ) && ( pxTaskDefinition->pxTaskBuffer != NULL ) )
- {
- /* Allocate space for the TCB. Where the memory comes from depends
- on the implementation of the port malloc function and whether or
- not static allocation is being used. */
- pxNewTCB = ( TCB_t * ) pxTaskDefinition->pxTaskBuffer;
- /* Store the stack location in the TCB. */
- pxNewTCB->pxStack = pxTaskDefinition->puxStackBuffer;
- #if( tskSTATIC_AND_DYNAMIC_ALLOCATION_POSSIBLE != 0 )
- {
- /* Tasks can be created statically or dynamically, so note this
- task was created statically in case the task is later deleted. */
- pxNewTCB->ucStaticallyAllocated = tskSTATICALLY_ALLOCATED_STACK_AND_TCB;
- }
- #endif /* configSUPPORT_DYNAMIC_ALLOCATION */
- prvInitialiseNewTask( pxTaskDefinition->pvTaskCode,
- pxTaskDefinition->pcName,
- ( uint32_t ) pxTaskDefinition->usStackDepth,
- pxTaskDefinition->pvParameters,
- pxTaskDefinition->uxPriority,
- pxCreatedTask, pxNewTCB,
- pxTaskDefinition->xRegions );
- prvAddNewTaskToReadyList( pxNewTCB );
- xReturn = pdPASS;
- }
- return xReturn;
- }
- #endif /* ( portUSING_MPU_WRAPPERS == 1 ) && ( configSUPPORT_STATIC_ALLOCATION == 1 ) */
- /*-----------------------------------------------------------*/
- #if( ( portUSING_MPU_WRAPPERS == 1 ) && ( configSUPPORT_DYNAMIC_ALLOCATION == 1 ) )
- BaseType_t xTaskCreateRestricted( const TaskParameters_t * const pxTaskDefinition, TaskHandle_t *pxCreatedTask )
- {
- TCB_t *pxNewTCB;
- BaseType_t xReturn = errCOULD_NOT_ALLOCATE_REQUIRED_MEMORY;
- configASSERT( pxTaskDefinition->puxStackBuffer );
- if( pxTaskDefinition->puxStackBuffer != NULL )
- {
- /* Allocate space for the TCB. Where the memory comes from depends
- on the implementation of the port malloc function and whether or
- not static allocation is being used. */
- pxNewTCB = ( TCB_t * ) pvPortMalloc( sizeof( TCB_t ) );
- if( pxNewTCB != NULL )
- {
- /* Store the stack location in the TCB. */
- pxNewTCB->pxStack = pxTaskDefinition->puxStackBuffer;
- #if( configSUPPORT_STATIC_ALLOCATION == 1 )
- {
- /* Tasks can be created statically or dynamically, so note
- this task had a statically allocated stack in case it is
- later deleted. The TCB was allocated dynamically. */
- pxNewTCB->ucStaticallyAllocated = tskSTATICALLY_ALLOCATED_STACK_ONLY;
- }
- #endif
- prvInitialiseNewTask( pxTaskDefinition->pvTaskCode,
- pxTaskDefinition->pcName,
- ( uint32_t ) pxTaskDefinition->usStackDepth,
- pxTaskDefinition->pvParameters,
- pxTaskDefinition->uxPriority,
- pxCreatedTask, pxNewTCB,
- pxTaskDefinition->xRegions );
- prvAddNewTaskToReadyList( pxNewTCB );
- xReturn = pdPASS;
- }
- }
- return xReturn;
- }
- #endif /* portUSING_MPU_WRAPPERS */
- /*-----------------------------------------------------------*/
- #if( configSUPPORT_DYNAMIC_ALLOCATION == 1 )
- BaseType_t xTaskCreate( TaskFunction_t pxTaskCode,
- const char * const pcName, /*lint !e971 Unqualified char types are allowed for strings and single characters only. */
- const configSTACK_DEPTH_TYPE usStackDepth,
- void * const pvParameters,
- UBaseType_t uxPriority,
- TaskHandle_t * const pxCreatedTask )
- {
- TCB_t *pxNewTCB;
- BaseType_t xReturn;
- /* If the stack grows down then allocate the stack then the TCB so the stack
- does not grow into the TCB. Likewise if the stack grows up then allocate
- the TCB then the stack. */
- #if( portSTACK_GROWTH > 0 )
- {
- /* Allocate space for the TCB. Where the memory comes from depends on
- the implementation of the port malloc function and whether or not static
- allocation is being used. */
- pxNewTCB = ( TCB_t * ) pvPortMalloc( sizeof( TCB_t ) );
- if( pxNewTCB != NULL )
- {
- /* Allocate space for the stack used by the task being created.
- The base of the stack memory stored in the TCB so the task can
- be deleted later if required. */
- pxNewTCB->pxStack = ( StackType_t * ) pvPortMalloc( ( ( ( size_t ) usStackDepth ) * sizeof( StackType_t ) ) ); /*lint !e961 MISRA exception as the casts are only redundant for some ports. */
- if( pxNewTCB->pxStack == NULL )
- {
- /* Could not allocate the stack. Delete the allocated TCB. */
- vPortFree( pxNewTCB );
- pxNewTCB = NULL;
- }
- }
- }
- #else /* portSTACK_GROWTH */
- {
- StackType_t *pxStack;
- /* Allocate space for the stack used by the task being created. */
- pxStack = ( StackType_t * ) pvPortMalloc( ( ( ( size_t ) usStackDepth ) * sizeof( StackType_t ) ) ); /*lint !e961 MISRA exception as the casts are only redundant for some ports. */
- if( pxStack != NULL )
- {
- /* Allocate space for the TCB. */
- pxNewTCB = ( TCB_t * ) pvPortMalloc( sizeof( TCB_t ) ); /*lint !e961 MISRA exception as the casts are only redundant for some paths. */
- if( pxNewTCB != NULL )
- {
- /* Store the stack location in the TCB. */
- pxNewTCB->pxStack = pxStack;
- }
- else
- {
- /* The stack cannot be used as the TCB was not created. Free
- it again. */
- vPortFree( pxStack );
- }
- }
- else
- {
- pxNewTCB = NULL;
- }
- }
- #endif /* portSTACK_GROWTH */
- if( pxNewTCB != NULL )
- {
- #if( tskSTATIC_AND_DYNAMIC_ALLOCATION_POSSIBLE != 0 ) /*lint !e731 Macro has been consolidated for readability reasons. */
- {
- /* Tasks can be created statically or dynamically, so note this
- task was created dynamically in case it is later deleted. */
- pxNewTCB->ucStaticallyAllocated = tskDYNAMICALLY_ALLOCATED_STACK_AND_TCB;
- }
- #endif /* configSUPPORT_STATIC_ALLOCATION */
- prvInitialiseNewTask( pxTaskCode, pcName, ( uint32_t ) usStackDepth, pvParameters, uxPriority, pxCreatedTask, pxNewTCB, NULL );
- prvAddNewTaskToReadyList( pxNewTCB );
- xReturn = pdPASS;
- }
- else
- {
- xReturn = errCOULD_NOT_ALLOCATE_REQUIRED_MEMORY;
- }
- return xReturn;
- }
- #endif /* configSUPPORT_DYNAMIC_ALLOCATION */
- /*-----------------------------------------------------------*/
- static void prvInitialiseNewTask( TaskFunction_t pxTaskCode,
- const char * const pcName, /*lint !e971 Unqualified char types are allowed for strings and single characters only. */
- const uint32_t ulStackDepth,
- void * const pvParameters,
- UBaseType_t uxPriority,
- TaskHandle_t * const pxCreatedTask,
- TCB_t *pxNewTCB,
- const MemoryRegion_t * const xRegions )
- {
- StackType_t *pxTopOfStack;
- UBaseType_t x;
- #if( portUSING_MPU_WRAPPERS == 1 )
- /* Should the task be created in privileged mode? */
- BaseType_t xRunPrivileged;
- if( ( uxPriority & portPRIVILEGE_BIT ) != 0U )
- {
- xRunPrivileged = pdTRUE;
- }
- else
- {
- xRunPrivileged = pdFALSE;
- }
- uxPriority &= ~portPRIVILEGE_BIT;
- #endif /* portUSING_MPU_WRAPPERS == 1 */
- /* Avoid dependency on memset() if it is not required. */
- #if( tskSET_NEW_STACKS_TO_KNOWN_VALUE == 1 )
- {
- /* Fill the stack with a known value to assist debugging. */
- ( void ) memset( pxNewTCB->pxStack, ( int ) tskSTACK_FILL_BYTE, ( size_t ) ulStackDepth * sizeof( StackType_t ) );
- }
- #endif /* tskSET_NEW_STACKS_TO_KNOWN_VALUE */
- /* Calculate the top of stack address. This depends on whether the stack
- grows from high memory to low (as per the 80x86) or vice versa.
- portSTACK_GROWTH is used to make the result positive or negative as required
- by the port. */
- #if( portSTACK_GROWTH < 0 )
- {
- pxTopOfStack = pxNewTCB->pxStack + ( ulStackDepth - ( uint32_t ) 1 );
- pxTopOfStack = ( StackType_t * ) ( ( ( portPOINTER_SIZE_TYPE ) pxTopOfStack ) & ( ~( ( portPOINTER_SIZE_TYPE ) portBYTE_ALIGNMENT_MASK ) ) ); /*lint !e923 MISRA exception. Avoiding casts between pointers and integers is not practical. Size differences accounted for using portPOINTER_SIZE_TYPE type. */
- /* Check the alignment of the calculated top of stack is correct. */
- configASSERT( ( ( ( portPOINTER_SIZE_TYPE ) pxTopOfStack & ( portPOINTER_SIZE_TYPE ) portBYTE_ALIGNMENT_MASK ) == 0UL ) );
- #if( configRECORD_STACK_HIGH_ADDRESS == 1 )
- {
- /* Also record the stack's high address, which may assist
- debugging. */
- pxNewTCB->pxEndOfStack = pxTopOfStack;
- }
- #endif /* configRECORD_STACK_HIGH_ADDRESS */
- }
- #else /* portSTACK_GROWTH */
- {
- pxTopOfStack = pxNewTCB->pxStack;
- /* Check the alignment of the stack buffer is correct. */
- configASSERT( ( ( ( portPOINTER_SIZE_TYPE ) pxNewTCB->pxStack & ( portPOINTER_SIZE_TYPE ) portBYTE_ALIGNMENT_MASK ) == 0UL ) );
- /* The other extreme of the stack space is required if stack checking is
- performed. */
- pxNewTCB->pxEndOfStack = pxNewTCB->pxStack + ( ulStackDepth - ( uint32_t ) 1 );
- }
- #endif /* portSTACK_GROWTH */
- /* Store the task name in the TCB. */
- for( x = ( UBaseType_t ) 0; x < ( UBaseType_t ) configMAX_TASK_NAME_LEN; x++ )
- {
- pxNewTCB->pcTaskName[ x ] = pcName[ x ];
- /* Don't copy all configMAX_TASK_NAME_LEN if the string is shorter than
- configMAX_TASK_NAME_LEN characters just in case the memory after the
- string is not accessible (extremely unlikely). */
- if( pcName[ x ] == 0x00 )
- {
- break;
- }
- else
- {
- mtCOVERAGE_TEST_MARKER();
- }
- }
- /* Ensure the name string is terminated in the case that the string length
- was greater or equal to configMAX_TASK_NAME_LEN. */
- pxNewTCB->pcTaskName[ configMAX_TASK_NAME_LEN - 1 ] = '\0';
- /* This is used as an array index so must ensure it's not too large. First
- remove the privilege bit if one is present. */
- if( uxPriority >= ( UBaseType_t ) configMAX_PRIORITIES )
- {
- uxPriority = ( UBaseType_t ) configMAX_PRIORITIES - ( UBaseType_t ) 1U;
- }
- else
- {
- mtCOVERAGE_TEST_MARKER();
- }
- pxNewTCB->uxPriority = uxPriority;
- #if ( configUSE_MUTEXES == 1 )
- {
- pxNewTCB->uxBasePriority = uxPriority;
- pxNewTCB->uxMutexesHeld = 0;
- }
- #endif /* configUSE_MUTEXES */
- vListInitialiseItem( &( pxNewTCB->xStateListItem ) );
- vListInitialiseItem( &( pxNewTCB->xEventListItem ) );
- /* Set the pxNewTCB as a link back from the ListItem_t. This is so we can get
- back to the containing TCB from a generic item in a list. */
- listSET_LIST_ITEM_OWNER( &( pxNewTCB->xStateListItem ), pxNewTCB );
- /* Event lists are always in priority order. */
- 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. */
- listSET_LIST_ITEM_OWNER( &( pxNewTCB->xEventListItem ), pxNewTCB );
- #if ( portCRITICAL_NESTING_IN_TCB == 1 )
- {
- pxNewTCB->uxCriticalNesting = ( UBaseType_t ) 0U;
- }
- #endif /* portCRITICAL_NESTING_IN_TCB */
- #if ( configUSE_APPLICATION_TASK_TAG == 1 )
- {
- pxNewTCB->pxTaskTag = NULL;
- }
- #endif /* configUSE_APPLICATION_TASK_TAG */
- #if ( configGENERATE_RUN_TIME_STATS == 1 )
- {
- pxNewTCB->ulRunTimeCounter = 0UL;
- }
- #endif /* configGENERATE_RUN_TIME_STATS */
- #if ( portUSING_MPU_WRAPPERS == 1 )
- {
- vPortStoreTaskMPUSettings( &( pxNewTCB->xMPUSettings ), xRegions, pxNewTCB->pxStack, ulStackDepth );
- }
- #else
- {
- /* Avoid compiler warning about unreferenced parameter. */
- ( void ) xRegions;
- }
- #endif
- #if( configNUM_THREAD_LOCAL_STORAGE_POINTERS != 0 )
- {
- for( x = 0; x < ( UBaseType_t ) configNUM_THREAD_LOCAL_STORAGE_POINTERS; x++ )
- {
- pxNewTCB->pvThreadLocalStoragePointers[ x ] = NULL;
- }
- }
- #endif
- #if ( configUSE_TASK_NOTIFICATIONS == 1 )
- {
- pxNewTCB->ulNotifiedValue = 0;
- pxNewTCB->ucNotifyState = taskNOT_WAITING_NOTIFICATION;
- }
- #endif
- #if ( configUSE_NEWLIB_REENTRANT == 1 )
- {
- /* Initialise this task's Newlib reent structure. */
- _REENT_INIT_PTR( ( &( pxNewTCB->xNewLib_reent ) ) );
- }
- #endif
- #if( INCLUDE_xTaskAbortDelay == 1 )
- {
- pxNewTCB->ucDelayAborted = pdFALSE;
- }
- #endif
- /* Initialize the TCB stack to look as if the task was already running,
- but had been interrupted by the scheduler. The return address is set
- to the start of the task function. Once the stack has been initialised
- the top of stack variable is updated. */
- #if( portUSING_MPU_WRAPPERS == 1 )
- {
- pxNewTCB->pxTopOfStack = pxPortInitialiseStack( pxTopOfStack, pxTaskCode, pvParameters, xRunPrivileged );
- }
- #else /* portUSING_MPU_WRAPPERS */
- {
- pxNewTCB->pxTopOfStack = pxPortInitialiseStack( pxTopOfStack, pxTaskCode, pvParameters );
- }
- #endif /* portUSING_MPU_WRAPPERS */
- if( ( void * ) pxCreatedTask != NULL )
- {
- /* Pass the handle out in an anonymous way. The handle can be used to
- change the created task's priority, delete the created task, etc.*/
- *pxCreatedTask = ( TaskHandle_t ) pxNewTCB;
- }
- else
- {
- mtCOVERAGE_TEST_MARKER();
- }
- }
- /*-----------------------------------------------------------*/
- static void prvAddNewTaskToReadyList( TCB_t *pxNewTCB )
- {
- /* Ensure interrupts don't access the task lists while the lists are being
- updated. */
- taskENTER_CRITICAL();
- {
- uxCurrentNumberOfTasks++;
- if( pxCurrentTCB == NULL )
- {
- /* There are no other tasks, or all the other tasks are in
- the suspended state - make this the current task. */
- pxCurrentTCB = pxNewTCB;
- if( uxCurrentNumberOfTasks == ( UBaseType_t ) 1 )
- {
- /* This is the first task to be created so do the preliminary
- initialisation required. We will not recover if this call
- fails, but we will report the failure. */
- prvInitialiseTaskLists();
- }
- else
- {
- mtCOVERAGE_TEST_MARKER();
- }
- }
- else
- {
- /* If the scheduler is not already running, make this task the
- current task if it is the highest priority task to be created
- so far. */
- if( xSchedulerRunning == pdFALSE )
- {
- if( pxCurrentTCB->uxPriority <= pxNewTCB->uxPriority )
- {
- pxCurrentTCB = pxNewTCB;
- }
- else
- {
- mtCOVERAGE_TEST_MARKER();
- }
- }
- else
- {
- mtCOVERAGE_TEST_MARKER();
- }
- }
- uxTaskNumber++;
- #if ( configUSE_TRACE_FACILITY == 1 )
- {
- /* Add a counter into the TCB for tracing only. */
- pxNewTCB->uxTCBNumber = uxTaskNumber;
- }
- #endif /* configUSE_TRACE_FACILITY */
- traceTASK_CREATE( pxNewTCB );
- prvAddTaskToReadyList( pxNewTCB );
- portSETUP_TCB( pxNewTCB );
- }
- taskEXIT_CRITICAL();
- if( xSchedulerRunning != pdFALSE )
- {
- /* If the created task is of a higher priority than the current task
- then it should run now. */
- if( pxCurrentTCB->uxPriority < pxNewTCB->uxPriority )
- {
- taskYIELD_IF_USING_PREEMPTION();
- }
- else
- {
- mtCOVERAGE_TEST_MARKER();
- }
- }
- else
- {
- mtCOVERAGE_TEST_MARKER();
- }
- }
- /*-----------------------------------------------------------*/
- #if ( INCLUDE_vTaskDelete == 1 )
- void vTaskDelete( TaskHandle_t xTaskToDelete )
- {
- TCB_t *pxTCB;
- taskENTER_CRITICAL();
- {
- /* If null is passed in here then it is the calling task that is
- being deleted. */
- pxTCB = prvGetTCBFromHandle( xTaskToDelete );
- /* Remove task from the ready list. */
- if( uxListRemove( &( pxTCB->xStateListItem ) ) == ( UBaseType_t ) 0 )
- {
- taskRESET_READY_PRIORITY( pxTCB->uxPriority );
- }
- else
- {
- mtCOVERAGE_TEST_MARKER();
- }
- /* Is the task waiting on an event also? */
- if( listLIST_ITEM_CONTAINER( &( pxTCB->xEventListItem ) ) != NULL )
- {
- ( void ) uxListRemove( &( pxTCB->xEventListItem ) );
- }
- else
- {
- mtCOVERAGE_TEST_MARKER();
- }
- /* Increment the uxTaskNumber also so kernel aware debuggers can
- detect that the task lists need re-generating. This is done before
- portPRE_TASK_DELETE_HOOK() as in the Windows port that macro will
- not return. */
- uxTaskNumber++;
- if( pxTCB == pxCurrentTCB )
- {
- /* A task is deleting itself. This cannot complete within the
- task itself, as a context switch to another task is required.
- Place the task in the termination list. The idle task will
- check the termination list and free up any memory allocated by
- the scheduler for the TCB and stack of the deleted task. */
- vListInsertEnd( &xTasksWaitingTermination, &( pxTCB->xStateListItem ) );
- /* Increment the ucTasksDeleted variable so the idle task knows
- there is a task that has been deleted and that it should therefore
- check the xTasksWaitingTermination list. */
- ++uxDeletedTasksWaitingCleanUp;
- /* The pre-delete hook is primarily for the Windows simulator,
- in which Windows specific clean up operations are performed,
- after which it is not possible to yield away from this task -
- hence xYieldPending is used to latch that a context switch is
- required. */
- portPRE_TASK_DELETE_HOOK( pxTCB, &xYieldPending );
- }
- else
- {
- --uxCurrentNumberOfTasks;
- prvDeleteTCB( pxTCB );
- /* Reset the next expected unblock time in case it referred to
- the task that has just been deleted. */
- prvResetNextTaskUnblockTime();
- }
- traceTASK_DELETE( pxTCB );
- }
- taskEXIT_CRITICAL();
- /* Force a reschedule if it is the currently running task that has just
- been deleted. */
- if( xSchedulerRunning != pdFALSE )
- {
- if( pxTCB == pxCurrentTCB )
- {
- configASSERT( uxSchedulerSuspended == 0 );
- portYIELD_WITHIN_API();
- }
- else
- {
- mtCOVERAGE_TEST_MARKER();
- }
- }
- }
- #endif /* INCLUDE_vTaskDelete */
- /*-----------------------------------------------------------*/
- #if ( INCLUDE_vTaskDelayUntil == 1 )
- void vTaskDelayUntil( TickType_t * const pxPreviousWakeTime, const TickType_t xTimeIncrement )
- {
- TickType_t xTimeToWake;
- BaseType_t xAlreadyYielded, xShouldDelay = pdFALSE;
- configASSERT( pxPreviousWakeTime );
- configASSERT( ( xTimeIncrement > 0U ) );
- configASSERT( uxSchedulerSuspended == 0 );
- vTaskSuspendAll();
- {
- /* Minor optimisation. The tick count cannot change in this
- block. */
- const TickType_t xConstTickCount = xTickCount;
- /* Generate the tick time at which the task wants to wake. */
- xTimeToWake = *pxPreviousWakeTime + xTimeIncrement;
- if( xConstTickCount < *pxPreviousWakeTime )
- {
- /* The tick count has overflowed since this function was
- lasted called. In this case the only time we should ever
- actually delay is if the wake time has also overflowed,
- and the wake time is greater than the tick time. When this
- is the case it is as if neither time had overflowed. */
- if( ( xTimeToWake < *pxPreviousWakeTime ) && ( xTimeToWake > xConstTickCount ) )
- {
- xShouldDelay = pdTRUE;
- }
- else
- {
- mtCOVERAGE_TEST_MARKER();
- }
- }
- else
- {
- /* The tick time has not overflowed. In this case we will
- delay if either the wake time has overflowed, and/or the
- tick time is less than the wake time. */
- if( ( xTimeToWake < *pxPreviousWakeTime ) || ( xTimeToWake > xConstTickCount ) )
- {
- xShouldDelay = pdTRUE;
- }
- else
- {
- mtCOVERAGE_TEST_MARKER();
- }
- }
- /* Update the wake time ready for the next call. */
- *pxPreviousWakeTime = xTimeToWake;
- if( xShouldDelay != pdFALSE )
- {
- traceTASK_DELAY_UNTIL( xTimeToWake );
- /* prvAddCurrentTaskToDelayedList() needs the block time, not
- the time to wake, so subtract the current tick count. */
- prvAddCurrentTaskToDelayedList( xTimeToWake - xConstTickCount, pdFALSE );
- }
- else
- {
- mtCOVERAGE_TEST_MARKER();
- }
- }
- xAlreadyYielded = xTaskResumeAll();
- /* Force a reschedule if xTaskResumeAll has not already done so, we may
- have put ourselves to sleep. */
- if( xAlreadyYielded == pdFALSE )
- {
- portYIELD_WITHIN_API();
- }
- else
- {
- mtCOVERAGE_TEST_MARKER();
- }
- }
- #endif /* INCLUDE_vTaskDelayUntil */
- /*-----------------------------------------------------------*/
- #if ( INCLUDE_vTaskDelay == 1 )
- void vTaskDelay( const TickType_t xTicksToDelay )
- {
- BaseType_t xAlreadyYielded = pdFALSE;
- /* A delay time of zero just forces a reschedule. */
- if( xTicksToDelay > ( TickType_t ) 0U )
- {
- configASSERT( uxSchedulerSuspended == 0 );
- vTaskSuspendAll();
- {
- traceTASK_DELAY();
- /* A task that is removed from the event list while the
- scheduler is suspended will not get placed in the ready
- list or removed from the blocked list until the scheduler
- is resumed.
- This task cannot be in an event list as it is the currently
- executing task. */
- prvAddCurrentTaskToDelayedList( xTicksToDelay, pdFALSE );
- }
- xAlreadyYielded = xTaskResumeAll();
- }
- else
- {
- mtCOVERAGE_TEST_MARKER();
- }
- /* Force a reschedule if xTaskResumeAll has not already done so, we may
- have put ourselves to sleep. */
- if( xAlreadyYielded == pdFALSE )
- {
- portYIELD_WITHIN_API();
- }
- else
- {
- mtCOVERAGE_TEST_MARKER();
- }
- }
- #endif /* INCLUDE_vTaskDelay */
- /*-----------------------------------------------------------*/
- #if( ( INCLUDE_eTaskGetState == 1 ) || ( configUSE_TRACE_FACILITY == 1 ) )
- eTaskState eTaskGetState( TaskHandle_t xTask )
- {
- eTaskState eReturn;
- List_t *pxStateList;
- const TCB_t * const pxTCB = ( TCB_t * ) xTask;
- configASSERT( pxTCB );
- if( pxTCB == pxCurrentTCB )
- {
- /* The task calling this function is querying its own state. */
- eReturn = eRunning;
- }
- else
- {
- taskENTER_CRITICAL();
- {
- pxStateList = ( List_t * ) listLIST_ITEM_CONTAINER( &( pxTCB->xStateListItem ) );
- }
- taskEXIT_CRITICAL();
- if( ( pxStateList == pxDelayedTaskList ) || ( pxStateList == pxOverflowDelayedTaskList ) )
- {
- /* The task being queried is referenced from one of the Blocked
- lists. */
- eReturn = eBlocked;
- }
- #if ( INCLUDE_vTaskSuspend == 1 )
- else if( pxStateList == &xSuspendedTaskList )
- {
- /* The task being queried is referenced from the suspended
- list. Is it genuinely suspended or is it block
- indefinitely? */
- if( listLIST_ITEM_CONTAINER( &( pxTCB->xEventListItem ) ) == NULL )
- {
- eReturn = eSuspended;
- }
- else
- {
- eReturn = eBlocked;
- }
- }
- #endif
- #if ( INCLUDE_vTaskDelete == 1 )
- else if( ( pxStateList == &xTasksWaitingTermination ) || ( pxStateList == NULL ) )
- {
- /* The task being queried is referenced from the deleted
- tasks list, or it is not referenced from any lists at
- all. */
- eReturn = eDeleted;
- }
- #endif
- else /*lint !e525 Negative indentation is intended to make use of pre-processor clearer. */
- {
- /* If the task is not in any other state, it must be in the
- Ready (including pending ready) state. */
- eReturn = eReady;
- }
- }
- return eReturn;
- } /*lint !e818 xTask cannot be a pointer to const because it is a typedef. */
- #endif /* INCLUDE_eTaskGetState */
- /*-----------------------------------------------------------*/
- #if ( INCLUDE_uxTaskPriorityGet == 1 )
- UBaseType_t uxTaskPriorityGet( TaskHandle_t xTask )
- {
- TCB_t *pxTCB;
- UBaseType_t uxReturn;
- taskENTER_CRITICAL();
- {
- /* If null is passed in here then it is the priority of the that
- called uxTaskPriorityGet() that is being queried. */
- pxTCB = prvGetTCBFromHandle( xTask );
- uxReturn = pxTCB->uxPriority;
- }
- taskEXIT_CRITICAL();
- return uxReturn;
- }
- #endif /* INCLUDE_uxTaskPriorityGet */
- /*-----------------------------------------------------------*/
- #if ( INCLUDE_uxTaskPriorityGet == 1 )
- UBaseType_t uxTaskPriorityGetFromISR( TaskHandle_t xTask )
- {
- TCB_t *pxTCB;
- UBaseType_t uxReturn, uxSavedInterruptState;
- /* RTOS ports that support interrupt nesting have the concept of a
- maximum system call (or maximum API call) interrupt priority.
- Interrupts that are above the maximum system call priority are keep
- permanently enabled, even when the RTOS kernel is in a critical section,
- but cannot make any calls to FreeRTOS API functions. If configASSERT()
- is defined in FreeRTOSConfig.h then
- portASSERT_IF_INTERRUPT_PRIORITY_INVALID() will result in an assertion
- failure if a FreeRTOS API function is called from an interrupt that has
- been assigned a priority above the configured maximum system call
- priority. Only FreeRTOS functions that end in FromISR can be called
- from interrupts that have been assigned a priority at or (logically)
- below the maximum system call interrupt priority. FreeRTOS maintains a
- separate interrupt safe API to ensure interrupt entry is as fast and as
- simple as possible. More information (albeit Cortex-M specific) is
- provided on the following link:
- http://www.freertos.org/RTOS-Cortex-M3-M4.html */
- portASSERT_IF_INTERRUPT_PRIORITY_INVALID();
- uxSavedInterruptState = portSET_INTERRUPT_MASK_FROM_ISR();
- {
- /* If null is passed in here then it is the priority of the calling
- task that is being queried. */
- pxTCB = prvGetTCBFromHandle( xTask );
- uxReturn = pxTCB->uxPriority;
- }
- portCLEAR_INTERRUPT_MASK_FROM_ISR( uxSavedInterruptState );
- return uxReturn;
- }
- #endif /* INCLUDE_uxTaskPriorityGet */
- /*-----------------------------------------------------------*/
- #if ( INCLUDE_vTaskPrioritySet == 1 )
- void vTaskPrioritySet( TaskHandle_t xTask, UBaseType_t uxNewPriority )
- {
- TCB_t *pxTCB;
- UBaseType_t uxCurrentBasePriority, uxPriorityUsedOnEntry;
- BaseType_t xYieldRequired = pdFALSE;
- configASSERT( ( uxNewPriority < configMAX_PRIORITIES ) );
- /* Ensure the new priority is valid. */
- if( uxNewPriority >= ( UBaseType_t ) configMAX_PRIORITIES )
- {
- uxNewPriority = ( UBaseType_t ) configMAX_PRIORITIES - ( UBaseType_t ) 1U;
- }
- else
- {
- mtCOVERAGE_TEST_MARKER();
- }
- taskENTER_CRITICAL();
- {
- /* If null is passed in here then it is the priority of the calling
- task that is being changed. */
- pxTCB = prvGetTCBFromHandle( xTask );
- traceTASK_PRIORITY_SET( pxTCB, uxNewPriority );
- #if ( configUSE_MUTEXES == 1 )
- {
- uxCurrentBasePriority = pxTCB->uxBasePriority;
- }
- #else
- {
- uxCurrentBasePriority = pxTCB->uxPriority;
- }
- #endif
- if( uxCurrentBasePriority != uxNewPriority )
- {
- /* The priority change may have readied a task of higher
- priority than the calling task. */
- if( uxNewPriority > uxCurrentBasePriority )
- {
- if( pxTCB != pxCurrentTCB )
- {
- /* The priority of a task other than the currently
- running task is being raised. Is the priority being
- raised above that of the running task? */
- if( uxNewPriority >= pxCurrentTCB->uxPriority )
- {
- xYieldRequired = pdTRUE;
- }
- else
- {
- mtCOVERAGE_TEST_MARKER();
- }
- }
- else
- {
- /* The priority of the running task is being raised,
- but the running task must already be the highest
- priority task able to run so no yield is required. */
- }
- }
- else if( pxTCB == pxCurrentTCB )
- {
- /* Setting the priority of the running task down means
- there may now be another task of higher priority that
- is ready to execute. */
- xYieldRequired = pdTRUE;
- }
- else
- {
- /* Setting the priority of any other task down does not
- require a yield as the running task must be above the
- new priority of the task being modified. */
- }
- /* Remember the ready list the task might be referenced from
- before its uxPriority member is changed so the
- taskRESET_READY_PRIORITY() macro can function correctly. */
- uxPriorityUsedOnEntry = pxTCB->uxPriority;
- #if ( configUSE_MUTEXES == 1 )
- {
- /* Only change the priority being used if the task is not
- currently using an inherited priority. */
- if( pxTCB->uxBasePriority == pxTCB->uxPriority )
- {
- pxTCB->uxPriority = uxNewPriority;
- }
- else
- {
- mtCOVERAGE_TEST_MARKER();
- }
- /* The base priority gets set whatever. */
- pxTCB->uxBasePriority = uxNewPriority;
- }
- #else
- {
- pxTCB->uxPriority = uxNewPriority;
- }
- #endif
- /* Only reset the event list item value if the value is not
- being used for anything else. */
- if( ( listGET_LIST_ITEM_VALUE( &( pxTCB->xEventListItem ) ) & taskEVENT_LIST_ITEM_VALUE_IN_USE ) == 0UL )
- {
- 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. */
- }
- else
- {
- mtCOVERAGE_TEST_MARKER();
- }
- /* If the task is in the blocked or suspended list we need do
- nothing more than change its priority variable. However, if
- the task is in a ready list it needs to be removed and placed
- in the list appropriate to its new priority. */
- if( listIS_CONTAINED_WITHIN( &( pxReadyTasksLists[ uxPriorityUsedOnEntry ] ), &( pxTCB->xStateListItem ) ) != pdFALSE )
- {
- /* The task is currently in its ready list - remove before
- adding it to it's new ready list. As we are in a critical
- section we can do this even if the scheduler is suspended. */
- if( uxListRemove( &( pxTCB->xStateListItem ) ) == ( UBaseType_t ) 0 )
- {
- /* It is known that the task is in its ready list so
- there is no need to check again and the port level
- reset macro can be called directly. */
- portRESET_READY_PRIORITY( uxPriorityUsedOnEntry, uxTopReadyPriority );
- }
- else
- {
- mtCOVERAGE_TEST_MARKER();
- }
- prvAddTaskToReadyList( pxTCB );
- }
- else
- {
- mtCOVERAGE_TEST_MARKER();
- }
- if( xYieldRequired != pdFALSE )
- {
- taskYIELD_IF_USING_PREEMPTION();
- }
- else
- {
- mtCOVERAGE_TEST_MARKER();
- }
- /* Remove compiler warning about unused variables when the port
- optimised task selection is not being used. */
- ( void ) uxPriorityUsedOnEntry;
- }
- }
- taskEXIT_CRITICAL();
- }
- #endif /* INCLUDE_vTaskPrioritySet */
- /*-----------------------------------------------------------*/
- #if ( INCLUDE_vTaskSuspend == 1 )
- void vTaskSuspend( TaskHandle_t xTaskToSuspend )
- {
- TCB_t *pxTCB;
- taskENTER_CRITICAL();
- {
- /* If null is passed in here then it is the running task that is
- being suspended. */
- pxTCB = prvGetTCBFromHandle( xTaskToSuspend );
- traceTASK_SUSPEND( pxTCB );
- /* Remove task from the ready/delayed list and place in the
- suspended list. */
- if( uxListRemove( &( pxTCB->xStateListItem ) ) == ( UBaseType_t ) 0 )
- {
- taskRESET_READY_PRIORITY( pxTCB->uxPriority );
- }
- else
- {
- mtCOVERAGE_TEST_MARKER();
- }
- /* Is the task waiting on an event also? */
- if( listLIST_ITEM_CONTAINER( &( pxTCB->xEventListItem ) ) != NULL )
- {
- ( void ) uxListRemove( &( pxTCB->xEventListItem ) );
- }
- else
- {
- mtCOVERAGE_TEST_MARKER();
- }
- vListInsertEnd( &xSuspendedTaskList, &( pxTCB->xStateListItem ) );
- #if( configUSE_TASK_NOTIFICATIONS == 1 )
- {
- if( pxTCB->ucNotifyState == taskWAITING_NOTIFICATION )
- {
- /* The task was blocked to wait for a notification, but is
- now suspended, so no notification was received. */
- pxTCB->ucNotifyState = taskNOT_WAITING_NOTIFICATION;
- }
- }
- #endif
- }
- taskEXIT_CRITICAL();
- if( xSchedulerRunning != pdFALSE )
- {
- /* Reset the next expected unblock time in case it referred to the
- task that is now in the Suspended state. */
- taskENTER_CRITICAL();
- {
- prvResetNextTaskUnblockTime();
- }
- taskEXIT_CRITICAL();
- }
- else
- {
- mtCOVERAGE_TEST_MARKER();
- }
- if( pxTCB == pxCurrentTCB )
- {
- if( xSchedulerRunning != pdFALSE )
- {
- /* The current task has just been suspended. */
- configASSERT( uxSchedulerSuspended == 0 );
- portYIELD_WITHIN_API();
- }
- else
- {
- /* The scheduler is not running, but the task that was pointed
- to by pxCurrentTCB has just been suspended and pxCurrentTCB
- must be adjusted to point to a different task. */
- if( listCURRENT_LIST_LENGTH( &xSuspendedTaskList ) == uxCurrentNumberOfTasks )
- {
- /* No other tasks are ready, so set pxCurrentTCB back to
- NULL so when the next task is created pxCurrentTCB will
- be set to point to it no matter what its relative priority
- is. */
- pxCurrentTCB = NULL;
- }
- else
- {
- vTaskSwitchContext();
- }
- }
- }
- else
- {
- mtCOVERAGE_TEST_MARKER();
- }
- }
- #endif /* INCLUDE_vTaskSuspend */
- /*-----------------------------------------------------------*/
- #if ( INCLUDE_vTaskSuspend == 1 )
- static BaseType_t prvTaskIsTaskSuspended( const TaskHandle_t xTask )
- {
- BaseType_t xReturn = pdFALSE;
- const TCB_t * const pxTCB = ( TCB_t * ) xTask;
- /* Accesses xPendingReadyList so must be called from a critical
- section. */
- /* It does not make sense to check if the calling task is suspended. */
- configASSERT( xTask );
- /* Is the task being resumed actually in the suspended list? */
- if( listIS_CONTAINED_WITHIN( &xSuspendedTaskList, &( pxTCB->xStateListItem ) ) != pdFALSE )
- {
- /* Has the task already been resumed from within an ISR? */
- if( listIS_CONTAINED_WITHIN( &xPendingReadyList, &( pxTCB->xEventListItem ) ) == pdFALSE )
- {
- /* Is it in the suspended list because it is in the Suspended
- state, or because is is blocked with no timeout? */
- if( listIS_CONTAINED_WITHIN( NULL, &( pxTCB->xEventListItem ) ) != pdFALSE ) /*lint !e961. The cast is only redundant when NULL is used. */
- {
- xReturn = pdTRUE;
- }
- else
- {
- mtCOVERAGE_TEST_MARKER();
- }
- }
- else
- {
- mtCOVERAGE_TEST_MARKER();
- }
- }
- else
- {
- mtCOVERAGE_TEST_MARKER();
- }
- return xReturn;
- } /*lint !e818 xTask cannot be a pointer to const because it is a typedef. */
- #endif /* INCLUDE_vTaskSuspend */
- /*-----------------------------------------------------------*/
- #if ( INCLUDE_vTaskSuspend == 1 )
- void vTaskResume( TaskHandle_t xTaskToResume )
- {
- TCB_t * const pxTCB = ( TCB_t * ) xTaskToResume;
- /* It does not make sense to resume the calling task. */
- configASSERT( xTaskToResume );
- /* The parameter cannot be NULL as it is impossible to resume the
- currently executing task. */
- if( ( pxTCB != NULL ) && ( pxTCB != pxCurrentTCB ) )
- {
- taskENTER_CRITICAL();
- {
- if( prvTaskIsTaskSuspended( pxTCB ) != pdFALSE )
- {
- traceTASK_RESUME( pxTCB );
- /* The ready list can be accessed even if the scheduler is
- suspended because this is inside a critical section. */
- ( void ) uxListRemove( &( pxTCB->xStateListItem ) );
- prvAddTaskToReadyList( pxTCB );
- /* A higher priority task may have just been resumed. */
- if( pxTCB->uxPriority >= pxCurrentTCB->uxPriority )
- {
- /* This yield may not cause the task just resumed to run,
- but will leave the lists in the correct state for the
- next yield. */
- taskYIELD_IF_USING_PREEMPTION();
- }
- else
- {
- mtCOVERAGE_TEST_MARKER();
- }
- }
- else
- {
- mtCOVERAGE_TEST_MARKER();
- }
- }
- taskEXIT_CRITICAL();
- }
- else
- {
- mtCOVERAGE_TEST_MARKER();
- }
- }
- #endif /* INCLUDE_vTaskSuspend */
- /*-----------------------------------------------------------*/
- #if ( ( INCLUDE_xTaskResumeFromISR == 1 ) && ( INCLUDE_vTaskSuspend == 1 ) )
- BaseType_t xTaskResumeFromISR( TaskHandle_t xTaskToResume )
- {
- BaseType_t xYieldRequired = pdFALSE;
- TCB_t * const pxTCB = ( TCB_t * ) xTaskToResume;
- UBaseType_t uxSavedInterruptStatus;
- configASSERT( xTaskToResume );
- /* RTOS ports that support interrupt nesting have the concept of a
- maximum system call (or maximum API call) interrupt priority.
- Interrupts that are above the maximum system call priority are keep
- permanently enabled, even when the RTOS kernel is in a critical section,
- but cannot make any calls to FreeRTOS API functions. If configASSERT()
- is defined in FreeRTOSConfig.h then
- portASSERT_IF_INTERRUPT_PRIORITY_INVALID() will result in an assertion
- failure if a FreeRTOS API function is called from an interrupt that has
- been assigned a priority above the configured maximum system call
- priority. Only FreeRTOS functions that end in FromISR can be called
- from interrupts that have been assigned a priority at or (logically)
- below the maximum system call interrupt priority. FreeRTOS maintains a
- separate interrupt safe API to ensure interrupt entry is as fast and as
- simple as possible. More information (albeit Cortex-M specific) is
- provided on the following link:
- http://www.freertos.org/RTOS-Cortex-M3-M4.html */
- portASSERT_IF_INTERRUPT_PRIORITY_INVALID();
- uxSavedInterruptStatus = portSET_INTERRUPT_MASK_FROM_ISR();
- {
- if( prvTaskIsTaskSuspended( pxTCB ) != pdFALSE )
- {
- traceTASK_RESUME_FROM_ISR( pxTCB );
- /* Check the ready lists can be accessed. */
- if( uxSchedulerSuspended == ( UBaseType_t ) pdFALSE )
- {
- /* Ready lists can be accessed so move the task from the
- suspended list to the ready list directly. */
- if( pxTCB->uxPriority >= pxCurrentTCB->uxPriority )
- {
- xYieldRequired = pdTRUE;
- }
- else
- {
- mtCOVERAGE_TEST_MARKER();
- }
- ( void ) uxListRemove( &( pxTCB->xStateListItem ) );
- prvAddTaskToReadyList( pxTCB );
- }
- else
- {
- /* The delayed or ready lists cannot be accessed so the task
- is held in the pending ready list until the scheduler is
- unsuspended. */
- vListInsertEnd( &( xPendingReadyList ), &( pxTCB->xEventListItem ) );
- }
- }
- else
- {
- mtCOVERAGE_TEST_MARKER();
- }
- }
- portCLEAR_INTERRUPT_MASK_FROM_ISR( uxSavedInterruptStatus );
- return xYieldRequired;
- }
- #endif /* ( ( INCLUDE_xTaskResumeFromISR == 1 ) && ( INCLUDE_vTaskSuspend == 1 ) ) */
- /*-----------------------------------------------------------*/
- void vTaskStartScheduler( void )
- {
- BaseType_t xReturn;
- /* Add the idle task at the lowest priority. */
- #if( configSUPPORT_STATIC_ALLOCATION == 1 )
- {
- StaticTask_t *pxIdleTaskTCBBuffer = NULL;
- StackType_t *pxIdleTaskStackBuffer = NULL;
- uint32_t ulIdleTaskStackSize;
- /* The Idle task is created using user provided RAM - obtain the
- address of the RAM then create the idle task. */
- vApplicationGetIdleTaskMemory( &pxIdleTaskTCBBuffer, &pxIdleTaskStackBuffer, &ulIdleTaskStackSize );
- xIdleTaskHandle = xTaskCreateStatic( prvIdleTask,
- configIDLE_TASK_NAME,
- ulIdleTaskStackSize,
- ( void * ) NULL, /*lint !e961. The cast is not redundant for all compilers. */
- ( tskIDLE_PRIORITY | portPRIVILEGE_BIT ),
- pxIdleTaskStackBuffer,
- pxIdleTaskTCBBuffer ); /*lint !e961 MISRA exception, justified as it is not a redundant explicit cast to all supported compilers. */
- if( xIdleTaskHandle != NULL )
- {
- xReturn = pdPASS;
- }
- else
- {
- xReturn = pdFAIL;
- }
- }
- #else
- {
- /* The Idle task is being created using dynamically allocated RAM. */
- xReturn = xTaskCreate( prvIdleTask,
- configIDLE_TASK_NAME,
- configMINIMAL_STACK_SIZE,
- ( void * ) NULL,
- ( tskIDLE_PRIORITY | portPRIVILEGE_BIT ),
- &xIdleTaskHandle ); /*lint !e961 MISRA exception, justified as it is not a redundant explicit cast to all supported compilers. */
- }
- #endif /* configSUPPORT_STATIC_ALLOCATION */
- #if ( configUSE_TIMERS == 1 )
- {
- if( xReturn == pdPASS )
- {
- xReturn = xTimerCreateTimerTask();
- }
- else
- {
- mtCOVERAGE_TEST_MARKER();
- }
- }
- #endif /* configUSE_TIMERS */
- if( xReturn == pdPASS )
- {
- /* freertos_tasks_c_additions_init() should only be called if the user
- definable macro FREERTOS_TASKS_C_ADDITIONS_INIT() is defined, as that is
- the only macro called by the function. */
- #ifdef FREERTOS_TASKS_C_ADDITIONS_INIT
- {
- freertos_tasks_c_additions_init();
- }
- #endif
- /* Interrupts are turned off here, to ensure a tick does not occur
- before or during the call to xPortStartScheduler(). The stacks of
- the created tasks contain a status word with interrupts switched on
- so interrupts will automatically get re-enabled when the first task
- starts to run. */
- portDISABLE_INTERRUPTS();
- #if ( configUSE_NEWLIB_REENTRANT == 1 )
- {
- /* Switch Newlib's _impure_ptr variable to point to the _reent
- structure specific to the task that will run first. */
- _impure_ptr = &( pxCurrentTCB->xNewLib_reent );
- }
- #endif /* configUSE_NEWLIB_REENTRANT */
- xNextTaskUnblockTime = portMAX_DELAY;
- xSchedulerRunning = pdTRUE;
- xTickCount = ( TickType_t ) 0U;
- /* If configGENERATE_RUN_TIME_STATS is defined then the following
- macro must be defined to configure the timer/counter used to generate
- the run time counter time base. NOTE: If configGENERATE_RUN_TIME_STATS
- is set to 0 and the following line fails to build then ensure you do not
- have portCONFIGURE_TIMER_FOR_RUN_TIME_STATS() defined in your
- FreeRTOSConfig.h file. */
- portCONFIGURE_TIMER_FOR_RUN_TIME_STATS();
- /* Setting up the timer tick is hardware specific and thus in the
- portable interface. */
- if( xPortStartScheduler() != pdFALSE )
- {
- /* Should not reach here as if the scheduler is running the
- function will not return. */
- }
- else
- {
- /* Should only reach here if a task calls xTaskEndScheduler(). */
- }
- }
- else
- {
- /* This line will only be reached if the kernel could not be started,
- because there was not enough FreeRTOS heap to create the idle task
- or the timer task. */
- configASSERT( xReturn != errCOULD_NOT_ALLOCATE_REQUIRED_MEMORY );
- }
- /* Prevent compiler warnings if INCLUDE_xTaskGetIdleTaskHandle is set to 0,
- meaning xIdleTaskHandle is not used anywhere else. */
- ( void ) xIdleTaskHandle;
- }
- /*-----------------------------------------------------------*/
- void vTaskEndScheduler( void )
- {
- /* Stop the scheduler interrupts and call the portable scheduler end
- routine so the original ISRs can be restored if necessary. The port
- layer must ensure interrupts enable bit is left in the correct state. */
- portDISABLE_INTERRUPTS();
- xSchedulerRunning = pdFALSE;
- vPortEndScheduler();
- }
- /*----------------------------------------------------------*/
- void vTaskSuspendAll( void )
- {
- /* A critical section is not required as the variable is of type
- BaseType_t. Please read Richard Barry's reply in the following link to a
- post in the FreeRTOS support forum before reporting this as a bug! -
- http://goo.gl/wu4acr */
- ++uxSchedulerSuspended;
- }
- /*----------------------------------------------------------*/
- #if ( configUSE_TICKLESS_IDLE != 0 )
- static TickType_t prvGetExpectedIdleTime( void )
- {
- TickType_t xReturn;
- UBaseType_t uxHigherPriorityReadyTasks = pdFALSE;
- /* uxHigherPriorityReadyTasks takes care of the case where
- configUSE_PREEMPTION is 0, so there may be tasks above the idle priority
- task that are in the Ready state, even though the idle task is
- running. */
- #if( configUSE_PORT_OPTIMISED_TASK_SELECTION == 0 )
- {
- if( uxTopReadyPriority > tskIDLE_PRIORITY )
- {
- uxHigherPriorityReadyTasks = pdTRUE;
- }
- }
- #else
- {
- const UBaseType_t uxLeastSignificantBit = ( UBaseType_t ) 0x01;
- /* When port optimised task selection is used the uxTopReadyPriority
- variable is used as a bit map. If bits other than the least
- significant bit are set then there are tasks that have a priority
- above the idle priority that are in the Ready state. This takes
- care of the case where the co-operative scheduler is in use. */
- if( uxTopReadyPriority > uxLeastSignificantBit )
- {
- uxHigherPriorityReadyTasks = pdTRUE;
- }
- }
- #endif
- if( pxCurrentTCB->uxPriority > tskIDLE_PRIORITY )
- {
- xReturn = 0;
- }
- else if( listCURRENT_LIST_LENGTH( &( pxReadyTasksLists[ tskIDLE_PRIORITY ] ) ) > 1 )
- {
- /* There are other idle priority tasks in the ready state. If
- time slicing is used then the very next tick interrupt must be
- processed. */
- xReturn = 0;
- }
- else if( uxHigherPriorityReadyTasks != pdFALSE )
- {
- /* There are tasks in the Ready state that have a priority above the
- idle priority. This path can only be reached if
- configUSE_PREEMPTION is 0. */
- xReturn = 0;
- }
- else
- {
- xReturn = xNextTaskUnblockTime - xTickCount;
- }
- return xReturn;
- }
- #endif /* configUSE_TICKLESS_IDLE */
- /*----------------------------------------------------------*/
- BaseType_t xTaskResumeAll( void )
- {
- TCB_t *pxTCB = NULL;
- BaseType_t xAlreadyYielded = pdFALSE;
- /* If uxSchedulerSuspended is zero then this function does not match a
- previous call to vTaskSuspendAll(). */
- configASSERT( uxSchedulerSuspended );
- /* It is possible that an ISR caused a task to be removed from an event
- list while the scheduler was suspended. If this was the case then the
- removed task will have been added to the xPendingReadyList. Once the
- scheduler has been resumed it is safe to move all the pending ready
- tasks from this list into their appropriate ready list. */
- taskENTER_CRITICAL();
- {
- --uxSchedulerSuspended;
- if( uxSchedulerSuspended == ( UBaseType_t ) pdFALSE )
- {
- if( uxCurrentNumberOfTasks > ( UBaseType_t ) 0U )
- {
- /* Move any readied tasks from the pending list into the
- appropriate ready list. */
- while( listLIST_IS_EMPTY( &xPendingReadyList ) == pdFALSE )
- {
- pxTCB = ( TCB_t * ) listGET_OWNER_OF_HEAD_ENTRY( ( &xPendingReadyList ) );
- ( void ) uxListRemove( &( pxTCB->xEventListItem ) );
- ( void ) uxListRemove( &( pxTCB->xStateListItem ) );
- prvAddTaskToReadyList( pxTCB );
- /* If the moved task has a priority higher than the current
- task then a yield must be performed. */
- if( pxTCB->uxPriority >= pxCurrentTCB->uxPriority )
- {
- xYieldPending = pdTRUE;
- }
- else
- {
- mtCOVERAGE_TEST_MARKER();
- }
- }
- if( pxTCB != NULL )
- {
- /* A task was unblocked while the scheduler was suspended,
- which may have prevented the next unblock time from being
- re-calculated, in which case re-calculate it now. Mainly
- important for low power tickless implementations, where
- this can prevent an unnecessary exit from low power
- state. */
- prvResetNextTaskUnblockTime();
- }
- /* If any ticks occurred while the scheduler was suspended then
- they should be processed now. This ensures the tick count does
- not slip, and that any delayed tasks are resumed at the correct
- time. */
- {
- UBaseType_t uxPendedCounts = uxPendedTicks; /* Non-volatile copy. */
- if( uxPendedCounts > ( UBaseType_t ) 0U )
- {
- do
- {
- if( xTaskIncrementTick() != pdFALSE )
- {
- xYieldPending = pdTRUE;
- }
- else
- {
- mtCOVERAGE_TEST_MARKER();
- }
- --uxPendedCounts;
- } while( uxPendedCounts > ( UBaseType_t ) 0U );
- uxPendedTicks = 0;
- }
- else
- {
- mtCOVERAGE_TEST_MARKER();
- }
- }
- if( xYieldPending != pdFALSE )
- {
- #if( configUSE_PREEMPTION != 0 )
- {
- xAlreadyYielded = pdTRUE;
- }
- #endif
- taskYIELD_IF_USING_PREEMPTION();
- }
- else
- {
- mtCOVERAGE_TEST_MARKER();
- }
- }
- }
- else
- {
- mtCOVERAGE_TEST_MARKER();
- }
- }
- taskEXIT_CRITICAL();
- return xAlreadyYielded;
- }
- /*-----------------------------------------------------------*/
- TickType_t xTaskGetTickCount( void )
- {
- TickType_t xTicks;
- /* Critical section required if running on a 16 bit processor. */
- portTICK_TYPE_ENTER_CRITICAL();
- {
- xTicks = xTickCount;
- }
- portTICK_TYPE_EXIT_CRITICAL();
- return xTicks;
- }
- /*-----------------------------------------------------------*/
- TickType_t xTaskGetTickCountFromISR( void )
- {
- TickType_t xReturn;
- UBaseType_t uxSavedInterruptStatus;
- /* RTOS ports that support interrupt nesting have the concept of a maximum
- system call (or maximum API call) interrupt priority. Interrupts that are
- above the maximum system call priority are kept permanently enabled, even
- when the RTOS kernel is in a critical section, but cannot make any calls to
- FreeRTOS API functions. If configASSERT() is defined in FreeRTOSConfig.h
- then portASSERT_IF_INTERRUPT_PRIORITY_INVALID() will result in an assertion
- failure if a FreeRTOS API function is called from an interrupt that has been
- assigned a priority above the configured maximum system call priority.
- Only FreeRTOS functions that end in FromISR can be called from interrupts
- that have been assigned a priority at or (logically) below the maximum
- system call interrupt priority. FreeRTOS maintains a separate interrupt
- safe API to ensure interrupt entry is as fast and as simple as possible.
- More information (albeit Cortex-M specific) is provided on the following
- link: http://www.freertos.org/RTOS-Cortex-M3-M4.html */
- portASSERT_IF_INTERRUPT_PRIORITY_INVALID();
- uxSavedInterruptStatus = portTICK_TYPE_SET_INTERRUPT_MASK_FROM_ISR();
- {
- xReturn = xTickCount;
- }
- portTICK_TYPE_CLEAR_INTERRUPT_MASK_FROM_ISR( uxSavedInterruptStatus );
- return xReturn;
- }
- /*-----------------------------------------------------------*/
- UBaseType_t uxTaskGetNumberOfTasks( void )
- {
- /* A critical section is not required because the variables are of type
- BaseType_t. */
- return uxCurrentNumberOfTasks;
- }
- /*-----------------------------------------------------------*/
- char *pcTaskGetName( TaskHandle_t xTaskToQuery ) /*lint !e971 Unqualified char types are allowed for strings and single characters only. */
- {
- TCB_t *pxTCB;
- /* If null is passed in here then the name of the calling task is being
- queried. */
- pxTCB = prvGetTCBFromHandle( xTaskToQuery );
- configASSERT( pxTCB );
- return &( pxTCB->pcTaskName[ 0 ] );
- }
- /*-----------------------------------------------------------*/
- #if ( INCLUDE_xTaskGetHandle == 1 )
- static TCB_t *prvSearchForNameWithinSingleList( List_t *pxList, const char pcNameToQuery[] )
- {
- TCB_t *pxNextTCB, *pxFirstTCB, *pxReturn = NULL;
- UBaseType_t x;
- char cNextChar;
- /* This function is called with the scheduler suspended. */
- if( listCURRENT_LIST_LENGTH( pxList ) > ( UBaseType_t ) 0 )
- {
- listGET_OWNER_OF_NEXT_ENTRY( pxFirstTCB, pxList );
- do
- {
- listGET_OWNER_OF_NEXT_ENTRY( pxNextTCB, pxList );
- /* Check each character in the name looking for a match or
- mismatch. */
- for( x = ( UBaseType_t ) 0; x < ( UBaseType_t ) configMAX_TASK_NAME_LEN; x++ )
- {
- cNextChar = pxNextTCB->pcTaskName[ x ];
- if( cNextChar != pcNameToQuery[ x ] )
- {
- /* Characters didn't match. */
- break;
- }
- else if( cNextChar == 0x00 )
- {
- /* Both strings terminated, a match must have been
- found. */
- pxReturn = pxNextTCB;
- break;
- }
- else
- {
- mtCOVERAGE_TEST_MARKER();
- }
- }
- if( pxReturn != NULL )
- {
- /* The handle has been found. */
- break;
- }
- } while( pxNextTCB != pxFirstTCB );
- }
- else
- {
- mtCOVERAGE_TEST_MARKER();
- }
- return pxReturn;
- }
- #endif /* INCLUDE_xTaskGetHandle */
- /*-----------------------------------------------------------*/
- #if ( INCLUDE_xTaskGetHandle == 1 )
- TaskHandle_t xTaskGetHandle( const char *pcNameToQuery ) /*lint !e971 Unqualified char types are allowed for strings and single characters only. */
- {
- UBaseType_t uxQueue = configMAX_PRIORITIES;
- TCB_t* pxTCB;
- /* Task names will be truncated to configMAX_TASK_NAME_LEN - 1 bytes. */
- configASSERT( strlen( pcNameToQuery ) < configMAX_TASK_NAME_LEN );
- vTaskSuspendAll();
- {
- /* Search the ready lists. */
- do
- {
- uxQueue--;
- pxTCB = prvSearchForNameWithinSingleList( ( List_t * ) &( pxReadyTasksLists[ uxQueue ] ), pcNameToQuery );
- if( pxTCB != NULL )
- {
- /* Found the handle. */
- break;
- }
- } while( uxQueue > ( UBaseType_t ) tskIDLE_PRIORITY ); /*lint !e961 MISRA exception as the casts are only redundant for some ports. */
- /* Search the delayed lists. */
- if( pxTCB == NULL )
- {
- pxTCB = prvSearchForNameWithinSingleList( ( List_t * ) pxDelayedTaskList, pcNameToQuery );
- }
- if( pxTCB == NULL )
- {
- pxTCB = prvSearchForNameWithinSingleList( ( List_t * ) pxOverflowDelayedTaskList, pcNameToQuery );
- }
- #if ( INCLUDE_vTaskSuspend == 1 )
- {
- if( pxTCB == NULL )
- {
- /* Search the suspended list. */
- pxTCB = prvSearchForNameWithinSingleList( &xSuspendedTaskList, pcNameToQuery );
- }
- }
- #endif
- #if( INCLUDE_vTaskDelete == 1 )
- {
- if( pxTCB == NULL )
- {
- /* Search the deleted list. */
- pxTCB = prvSearchForNameWithinSingleList( &xTasksWaitingTermination, pcNameToQuery );
- }
- }
- #endif
- }
- ( void ) xTaskResumeAll();
- return ( TaskHandle_t ) pxTCB;
- }
- #endif /* INCLUDE_xTaskGetHandle */
- /*-----------------------------------------------------------*/
- #if ( configUSE_TRACE_FACILITY == 1 )
- UBaseType_t uxTaskGetSystemState( TaskStatus_t * const pxTaskStatusArray, const UBaseType_t uxArraySize, uint32_t * const pulTotalRunTime )
- {
- UBaseType_t uxTask = 0, uxQueue = configMAX_PRIORITIES;
- vTaskSuspendAll();
- {
- /* Is there a space in the array for each task in the system? */
- if( uxArraySize >= uxCurrentNumberOfTasks )
- {
- /* Fill in an TaskStatus_t structure with information on each
- task in the Ready state. */
- do
- {
- uxQueue--;
- uxTask += prvListTasksWithinSingleList( &( pxTaskStatusArray[ uxTask ] ), &( pxReadyTasksLists[ uxQueue ] ), eReady );
- } while( uxQueue > ( UBaseType_t ) tskIDLE_PRIORITY ); /*lint !e961 MISRA exception as the casts are only redundant for some ports. */
- /* Fill in an TaskStatus_t structure with information on each
- task in the Blocked state. */
- uxTask += prvListTasksWithinSingleList( &( pxTaskStatusArray[ uxTask ] ), ( List_t * ) pxDelayedTaskList, eBlocked );
- uxTask += prvListTasksWithinSingleList( &( pxTaskStatusArray[ uxTask ] ), ( List_t * ) pxOverflowDelayedTaskList, eBlocked );
- #if( INCLUDE_vTaskDelete == 1 )
- {
- /* Fill in an TaskStatus_t structure with information on
- each task that has been deleted but not yet cleaned up. */
- uxTask += prvListTasksWithinSingleList( &( pxTaskStatusArray[ uxTask ] ), &xTasksWaitingTermination, eDeleted );
- }
- #endif
- #if ( INCLUDE_vTaskSuspend == 1 )
- {
- /* Fill in an TaskStatus_t structure with information on
- each task in the Suspended state. */
- uxTask += prvListTasksWithinSingleList( &( pxTaskStatusArray[ uxTask ] ), &xSuspendedTaskList, eSuspended );
- }
- #endif
- #if ( configGENERATE_RUN_TIME_STATS == 1)
- {
- if( pulTotalRunTime != NULL )
- {
- #ifdef portALT_GET_RUN_TIME_COUNTER_VALUE
- portALT_GET_RUN_TIME_COUNTER_VALUE( ( *pulTotalRunTime ) );
- #else
- *pulTotalRunTime = portGET_RUN_TIME_COUNTER_VALUE();
- #endif
- }
- }
- #else
- {
- if( pulTotalRunTime != NULL )
- {
- *pulTotalRunTime = 0;
- }
- }
- #endif
- }
- else
- {
- mtCOVERAGE_TEST_MARKER();
- }
- }
- ( void ) xTaskResumeAll();
- return uxTask;
- }
- #endif /* configUSE_TRACE_FACILITY */
- /*----------------------------------------------------------*/
- #if ( INCLUDE_xTaskGetIdleTaskHandle == 1 )
- TaskHandle_t xTaskGetIdleTaskHandle( void )
- {
- /* If xTaskGetIdleTaskHandle() is called before the scheduler has been
- started, then xIdleTaskHandle will be NULL. */
- configASSERT( ( xIdleTaskHandle != NULL ) );
- return xIdleTaskHandle;
- }
- #endif /* INCLUDE_xTaskGetIdleTaskHandle */
- /*----------------------------------------------------------*/
- /* This conditional compilation should use inequality to 0, not equality to 1.
- This is to ensure vTaskStepTick() is available when user defined low power mode
- implementations require configUSE_TICKLESS_IDLE to be set to a value other than
- 1. */
- #if ( configUSE_TICKLESS_IDLE != 0 )
- void vTaskStepTick( const TickType_t xTicksToJump )
- {
- /* Correct the tick count value after a period during which the tick
- was suppressed. Note this does *not* call the tick hook function for
- each stepped tick. */
- configASSERT( ( xTickCount + xTicksToJump ) <= xNextTaskUnblockTime );
- xTickCount += xTicksToJump;
- traceINCREASE_TICK_COUNT( xTicksToJump );
- }
- #endif /* configUSE_TICKLESS_IDLE */
- /*----------------------------------------------------------*/
- #if ( INCLUDE_xTaskAbortDelay == 1 )
- BaseType_t xTaskAbortDelay( TaskHandle_t xTask )
- {
- TCB_t *pxTCB = ( TCB_t * ) xTask;
- BaseType_t xReturn;
- configASSERT( pxTCB );
- vTaskSuspendAll();
- {
- /* A task can only be prematurely removed from the Blocked state if
- it is actually in the Blocked state. */
- if( eTaskGetState( xTask ) == eBlocked )
- {
- xReturn = pdPASS;
- /* Remove the reference to the task from the blocked list. An
- interrupt won't touch the xStateListItem because the
- scheduler is suspended. */
- ( void ) uxListRemove( &( pxTCB->xStateListItem ) );
- /* Is the task waiting on an event also? If so remove it from
- the event list too. Interrupts can touch the event list item,
- even though the scheduler is suspended, so a critical section
- is used. */
- taskENTER_CRITICAL();
- {
- if( listLIST_ITEM_CONTAINER( &( pxTCB->xEventListItem ) ) != NULL )
- {
- ( void ) uxListRemove( &( pxTCB->xEventListItem ) );
- pxTCB->ucDelayAborted = pdTRUE;
- }
- else
- {
- mtCOVERAGE_TEST_MARKER();
- }
- }
- taskEXIT_CRITICAL();
- /* Place the unblocked task into the appropriate ready list. */
- prvAddTaskToReadyList( pxTCB );
- /* A task being unblocked cannot cause an immediate context
- switch if preemption is turned off. */
- #if ( configUSE_PREEMPTION == 1 )
- {
- /* Preemption is on, but a context switch should only be
- performed if the unblocked task has a priority that is
- equal to or higher than the currently executing task. */
- if( pxTCB->uxPriority > pxCurrentTCB->uxPriority )
- {
- /* Pend the yield to be performed when the scheduler
- is unsuspended. */
- xYieldPending = pdTRUE;
- }
- else
- {
- mtCOVERAGE_TEST_MARKER();
- }
- }
- #endif /* configUSE_PREEMPTION */
- }
- else
- {
- xReturn = pdFAIL;
- }
- }
- ( void ) xTaskResumeAll();
- return xReturn;
- }
- #endif /* INCLUDE_xTaskAbortDelay */
- /*----------------------------------------------------------*/
- BaseType_t xTaskIncrementTick( void )
- {
- TCB_t * pxTCB;
- TickType_t xItemValue;
- BaseType_t xSwitchRequired = pdFALSE;
- /* Called by the portable layer each time a tick interrupt occurs.
- Increments the tick then checks to see if the new tick value will cause any
- tasks to be unblocked. */
- traceTASK_INCREMENT_TICK( xTickCount );
- if( uxSchedulerSuspended == ( UBaseType_t ) pdFALSE )
- {
- /* Minor optimisation. The tick count cannot change in this
- block. */
- const TickType_t xConstTickCount = xTickCount + ( TickType_t ) 1;
- /* Increment the RTOS tick, switching the delayed and overflowed
- delayed lists if it wraps to 0. */
- xTickCount = xConstTickCount;
- if( xConstTickCount == ( TickType_t ) 0U ) /*lint !e774 'if' does not always evaluate to false as it is looking for an overflow. */
- {
- taskSWITCH_DELAYED_LISTS();
- }
- else
- {
- mtCOVERAGE_TEST_MARKER();
- }
- /* See if this tick has made a timeout expire. Tasks are stored in
- the queue in the order of their wake time - meaning once one task
- has been found whose block time has not expired there is no need to
- look any further down the list. */
- if( xConstTickCount >= xNextTaskUnblockTime )
- {
- for( ;; )
- {
- if( listLIST_IS_EMPTY( pxDelayedTaskList ) != pdFALSE )
- {
- /* The delayed list is empty. Set xNextTaskUnblockTime
- to the maximum possible value so it is extremely
- unlikely that the
- if( xTickCount >= xNextTaskUnblockTime ) test will pass
- next time through. */
- xNextTaskUnblockTime = portMAX_DELAY; /*lint !e961 MISRA exception as the casts are only redundant for some ports. */
- break;
- }
- else
- {
- /* The delayed list is not empty, get the value of the
- item at the head of the delayed list. This is the time
- at which the task at the head of the delayed list must
- be removed from the Blocked state. */
- pxTCB = ( TCB_t * ) listGET_OWNER_OF_HEAD_ENTRY( pxDelayedTaskList );
- xItemValue = listGET_LIST_ITEM_VALUE( &( pxTCB->xStateListItem ) );
- if( xConstTickCount < xItemValue )
- {
- /* It is not time to unblock this item yet, but the
- item value is the time at which the task at the head
- of the blocked list must be removed from the Blocked
- state - so record the item value in
- xNextTaskUnblockTime. */
- xNextTaskUnblockTime = xItemValue;
- break;
- }
- else
- {
- mtCOVERAGE_TEST_MARKER();
- }
- /* It is time to remove the item from the Blocked state. */
- ( void ) uxListRemove( &( pxTCB->xStateListItem ) );
- /* Is the task waiting on an event also? If so remove
- it from the event list. */
- if( listLIST_ITEM_CONTAINER( &( pxTCB->xEventListItem ) ) != NULL )
- {
- ( void ) uxListRemove( &( pxTCB->xEventListItem ) );
- }
- else
- {
- mtCOVERAGE_TEST_MARKER();
- }
- /* Place the unblocked task into the appropriate ready
- list. */
- prvAddTaskToReadyList( pxTCB );
- /* A task being unblocked cannot cause an immediate
- context switch if preemption is turned off. */
- #if ( configUSE_PREEMPTION == 1 )
- {
- /* Preemption is on, but a context switch should
- only be performed if the unblocked task has a
- priority that is equal to or higher than the
- currently executing task. */
- if( pxTCB->uxPriority >= pxCurrentTCB->uxPriority )
- {
- xSwitchRequired = pdTRUE;
- }
- else
- {
- mtCOVERAGE_TEST_MARKER();
- }
- }
- #endif /* configUSE_PREEMPTION */
- }
- }
- }
- /* Tasks of equal priority to the currently running task will share
- processing time (time slice) if preemption is on, and the application
- writer has not explicitly turned time slicing off. */
- #if ( ( configUSE_PREEMPTION == 1 ) && ( configUSE_TIME_SLICING == 1 ) )
- {
- if( listCURRENT_LIST_LENGTH( &( pxReadyTasksLists[ pxCurrentTCB->uxPriority ] ) ) > ( UBaseType_t ) 1 )
- {
- xSwitchRequired = pdTRUE;
- }
- else
- {
- mtCOVERAGE_TEST_MARKER();
- }
- }
- #endif /* ( ( configUSE_PREEMPTION == 1 ) && ( configUSE_TIME_SLICING == 1 ) ) */
- #if ( configUSE_TICK_HOOK == 1 )
- {
- /* Guard against the tick hook being called when the pended tick
- count is being unwound (when the scheduler is being unlocked). */
- if( uxPendedTicks == ( UBaseType_t ) 0U )
- {
- vApplicationTickHook();
- }
- else
- {
- mtCOVERAGE_TEST_MARKER();
- }
- }
- #endif /* configUSE_TICK_HOOK */
- }
- else
- {
- ++uxPendedTicks;
- /* The tick hook gets called at regular intervals, even if the
- scheduler is locked. */
- #if ( configUSE_TICK_HOOK == 1 )
- {
- vApplicationTickHook();
- }
- #endif
- }
- #if ( configUSE_PREEMPTION == 1 )
- {
- if( xYieldPending != pdFALSE )
- {
- xSwitchRequired = pdTRUE;
- }
- else
- {
- mtCOVERAGE_TEST_MARKER();
- }
- }
- #endif /* configUSE_PREEMPTION */
- return xSwitchRequired;
- }
- /*-----------------------------------------------------------*/
- #if ( configUSE_APPLICATION_TASK_TAG == 1 )
- void vTaskSetApplicationTaskTag( TaskHandle_t xTask, TaskHookFunction_t pxHookFunction )
- {
- TCB_t *xTCB;
- /* If xTask is NULL then it is the task hook of the calling task that is
- getting set. */
- if( xTask == NULL )
- {
- xTCB = ( TCB_t * ) pxCurrentTCB;
- }
- else
- {
- xTCB = ( TCB_t * ) xTask;
- }
- /* Save the hook function in the TCB. A critical section is required as
- the value can be accessed from an interrupt. */
- taskENTER_CRITICAL();
- xTCB->pxTaskTag = pxHookFunction;
- taskEXIT_CRITICAL();
- }
- #endif /* configUSE_APPLICATION_TASK_TAG */
- /*-----------------------------------------------------------*/
- #if ( configUSE_APPLICATION_TASK_TAG == 1 )
- TaskHookFunction_t xTaskGetApplicationTaskTag( TaskHandle_t xTask )
- {
- TCB_t *xTCB;
- TaskHookFunction_t xReturn;
- /* If xTask is NULL then we are setting our own task hook. */
- if( xTask == NULL )
- {
- xTCB = ( TCB_t * ) pxCurrentTCB;
- }
- else
- {
- xTCB = ( TCB_t * ) xTask;
- }
- /* Save the hook function in the TCB. A critical section is required as
- the value can be accessed from an interrupt. */
- taskENTER_CRITICAL();
- {
- xReturn = xTCB->pxTaskTag;
- }
- taskEXIT_CRITICAL();
- return xReturn;
- }
- #endif /* configUSE_APPLICATION_TASK_TAG */
- /*-----------------------------------------------------------*/
- #if ( configUSE_APPLICATION_TASK_TAG == 1 )
- BaseType_t xTaskCallApplicationTaskHook( TaskHandle_t xTask, void *pvParameter )
- {
- TCB_t *xTCB;
- BaseType_t xReturn;
- /* If xTask is NULL then we are calling our own task hook. */
- if( xTask == NULL )
- {
- xTCB = ( TCB_t * ) pxCurrentTCB;
- }
- else
- {
- xTCB = ( TCB_t * ) xTask;
- }
- if( xTCB->pxTaskTag != NULL )
- {
- xReturn = xTCB->pxTaskTag( pvParameter );
- }
- else
- {
- xReturn = pdFAIL;
- }
- return xReturn;
- }
- #endif /* configUSE_APPLICATION_TASK_TAG */
- /*-----------------------------------------------------------*/
- void vTaskSwitchContext( void )
- {
- if( uxSchedulerSuspended != ( UBaseType_t ) pdFALSE )
- {
- /* The scheduler is currently suspended - do not allow a context
- switch. */
- xYieldPending = pdTRUE;
- }
- else
- {
- xYieldPending = pdFALSE;
- traceTASK_SWITCHED_OUT();
- #if ( configGENERATE_RUN_TIME_STATS == 1 )
- {
- #ifdef portALT_GET_RUN_TIME_COUNTER_VALUE
- portALT_GET_RUN_TIME_COUNTER_VALUE( ulTotalRunTime );
- #else
- ulTotalRunTime = portGET_RUN_TIME_COUNTER_VALUE();
- #endif
- /* Add the amount of time the task has been running to the
- accumulated time so far. The time the task started running was
- stored in ulTaskSwitchedInTime. Note that there is no overflow
- protection here so count values are only valid until the timer
- overflows. The guard against negative values is to protect
- against suspect run time stat counter implementations - which
- are provided by the application, not the kernel. */
- if( ulTotalRunTime > ulTaskSwitchedInTime )
- {
- pxCurrentTCB->ulRunTimeCounter += ( ulTotalRunTime - ulTaskSwitchedInTime );
- }
- else
- {
- mtCOVERAGE_TEST_MARKER();
- }
- ulTaskSwitchedInTime = ulTotalRunTime;
- }
- #endif /* configGENERATE_RUN_TIME_STATS */
- /* Check for stack overflow, if configured. */
- taskCHECK_FOR_STACK_OVERFLOW();
- /* Select a new task to run using either the generic C or port
- optimised asm code. */
- taskSELECT_HIGHEST_PRIORITY_TASK();
- traceTASK_SWITCHED_IN();
- #if ( configUSE_NEWLIB_REENTRANT == 1 )
- {
- /* Switch Newlib's _impure_ptr variable to point to the _reent
- structure specific to this task. */
- _impure_ptr = &( pxCurrentTCB->xNewLib_reent );
- }
- #endif /* configUSE_NEWLIB_REENTRANT */
- }
- }
- /*-----------------------------------------------------------*/
- void vTaskPlaceOnEventList( List_t * const pxEventList, const TickType_t xTicksToWait )
- {
- configASSERT( pxEventList );
- /* THIS FUNCTION MUST BE CALLED WITH EITHER INTERRUPTS DISABLED OR THE
- SCHEDULER SUSPENDED AND THE QUEUE BEING ACCESSED LOCKED. */
- /* Place the event list item of the TCB in the appropriate event list.
- This is placed in the list in priority order so the highest priority task
- is the first to be woken by the event. The queue that contains the event
- list is locked, preventing simultaneous access from interrupts. */
- vListInsert( pxEventList, &( pxCurrentTCB->xEventListItem ) );
- prvAddCurrentTaskToDelayedList( xTicksToWait, pdTRUE );
- }
- /*-----------------------------------------------------------*/
- void vTaskPlaceOnUnorderedEventList( List_t * pxEventList, const TickType_t xItemValue, const TickType_t xTicksToWait )
- {
- configASSERT( pxEventList );
- /* THIS FUNCTION MUST BE CALLED WITH THE SCHEDULER SUSPENDED. It is used by
- the event groups implementation. */
- configASSERT( uxSchedulerSuspended != 0 );
- /* Store the item value in the event list item. It is safe to access the
- event list item here as interrupts won't access the event list item of a
- task that is not in the Blocked state. */
- listSET_LIST_ITEM_VALUE( &( pxCurrentTCB->xEventListItem ), xItemValue | taskEVENT_LIST_ITEM_VALUE_IN_USE );
- /* Place the event list item of the TCB at the end of the appropriate event
- list. It is safe to access the event list here because it is part of an
- event group implementation - and interrupts don't access event groups
- directly (instead they access them indirectly by pending function calls to
- the task level). */
- vListInsertEnd( pxEventList, &( pxCurrentTCB->xEventListItem ) );
- prvAddCurrentTaskToDelayedList( xTicksToWait, pdTRUE );
- }
- /*-----------------------------------------------------------*/
- #if( configUSE_TIMERS == 1 )
- void vTaskPlaceOnEventListRestricted( List_t * const pxEventList, TickType_t xTicksToWait, const BaseType_t xWaitIndefinitely )
- {
- configASSERT( pxEventList );
- /* This function should not be called by application code hence the
- 'Restricted' in its name. It is not part of the public API. It is
- designed for use by kernel code, and has special calling requirements -
- it should be called with the scheduler suspended. */
- /* Place the event list item of the TCB in the appropriate event list.
- In this case it is assume that this is the only task that is going to
- be waiting on this event list, so the faster vListInsertEnd() function
- can be used in place of vListInsert. */
- vListInsertEnd( pxEventList, &( pxCurrentTCB->xEventListItem ) );
- /* If the task should block indefinitely then set the block time to a
- value that will be recognised as an indefinite delay inside the
- prvAddCurrentTaskToDelayedList() function. */
- if( xWaitIndefinitely != pdFALSE )
- {
- xTicksToWait = portMAX_DELAY;
- }
- traceTASK_DELAY_UNTIL( ( xTickCount + xTicksToWait ) );
- prvAddCurrentTaskToDelayedList( xTicksToWait, xWaitIndefinitely );
- }
- #endif /* configUSE_TIMERS */
- /*-----------------------------------------------------------*/
- BaseType_t xTaskRemoveFromEventList( const List_t * const pxEventList )
- {
- TCB_t *pxUnblockedTCB;
- BaseType_t xReturn;
- /* THIS FUNCTION MUST BE CALLED FROM A CRITICAL SECTION. It can also be
- called from a critical section within an ISR. */
- /* The event list is sorted in priority order, so the first in the list can
- be removed as it is known to be the highest priority. Remove the TCB from
- the delayed list, and add it to the ready list.
- If an event is for a queue that is locked then this function will never
- get called - the lock count on the queue will get modified instead. This
- means exclusive access to the event list is guaranteed here.
- This function assumes that a check has already been made to ensure that
- pxEventList is not empty. */
- pxUnblockedTCB = ( TCB_t * ) listGET_OWNER_OF_HEAD_ENTRY( pxEventList );
- configASSERT( pxUnblockedTCB );
- ( void ) uxListRemove( &( pxUnblockedTCB->xEventListItem ) );
- if( uxSchedulerSuspended == ( UBaseType_t ) pdFALSE )
- {
- ( void ) uxListRemove( &( pxUnblockedTCB->xStateListItem ) );
- prvAddTaskToReadyList( pxUnblockedTCB );
- }
- else
- {
- /* The delayed and ready lists cannot be accessed, so hold this task
- pending until the scheduler is resumed. */
- vListInsertEnd( &( xPendingReadyList ), &( pxUnblockedTCB->xEventListItem ) );
- }
- if( pxUnblockedTCB->uxPriority > pxCurrentTCB->uxPriority )
- {
- /* Return true if the task removed from the event list has a higher
- priority than the calling task. This allows the calling task to know if
- it should force a context switch now. */
- xReturn = pdTRUE;
- /* Mark that a yield is pending in case the user is not using the
- "xHigherPriorityTaskWoken" parameter to an ISR safe FreeRTOS function. */
- xYieldPending = pdTRUE;
- }
- else
- {
- xReturn = pdFALSE;
- }
- #if( configUSE_TICKLESS_IDLE != 0 )
- {
- /* If a task is blocked on a kernel object then xNextTaskUnblockTime
- might be set to the blocked task's time out time. If the task is
- unblocked for a reason other than a timeout xNextTaskUnblockTime is
- normally left unchanged, because it is automatically reset to a new
- value when the tick count equals xNextTaskUnblockTime. However if
- tickless idling is used it might be more important to enter sleep mode
- at the earliest possible time - so reset xNextTaskUnblockTime here to
- ensure it is updated at the earliest possible time. */
- prvResetNextTaskUnblockTime();
- }
- #endif
- return xReturn;
- }
- /*-----------------------------------------------------------*/
- void vTaskRemoveFromUnorderedEventList( ListItem_t * pxEventListItem, const TickType_t xItemValue )
- {
- TCB_t *pxUnblockedTCB;
- /* THIS FUNCTION MUST BE CALLED WITH THE SCHEDULER SUSPENDED. It is used by
- the event flags implementation. */
- configASSERT( uxSchedulerSuspended != pdFALSE );
- /* Store the new item value in the event list. */
- listSET_LIST_ITEM_VALUE( pxEventListItem, xItemValue | taskEVENT_LIST_ITEM_VALUE_IN_USE );
- /* Remove the event list form the event flag. Interrupts do not access
- event flags. */
- pxUnblockedTCB = ( TCB_t * ) listGET_LIST_ITEM_OWNER( pxEventListItem );
- configASSERT( pxUnblockedTCB );
- ( void ) uxListRemove( pxEventListItem );
- /* Remove the task from the delayed list and add it to the ready list. The
- scheduler is suspended so interrupts will not be accessing the ready
- lists. */
- ( void ) uxListRemove( &( pxUnblockedTCB->xStateListItem ) );
- prvAddTaskToReadyList( pxUnblockedTCB );
- if( pxUnblockedTCB->uxPriority > pxCurrentTCB->uxPriority )
- {
- /* The unblocked task has a priority above that of the calling task, so
- a context switch is required. This function is called with the
- scheduler suspended so xYieldPending is set so the context switch
- occurs immediately that the scheduler is resumed (unsuspended). */
- xYieldPending = pdTRUE;
- }
- }
- /*-----------------------------------------------------------*/
- void vTaskSetTimeOutState( TimeOut_t * const pxTimeOut )
- {
- configASSERT( pxTimeOut );
- taskENTER_CRITICAL();
- {
- pxTimeOut->xOverflowCount = xNumOfOverflows;
- pxTimeOut->xTimeOnEntering = xTickCount;
- }
- taskEXIT_CRITICAL();
- }
- /*-----------------------------------------------------------*/
- void vTaskInternalSetTimeOutState( TimeOut_t * const pxTimeOut )
- {
- /* For internal use only as it does not use a critical section. */
- pxTimeOut->xOverflowCount = xNumOfOverflows;
- pxTimeOut->xTimeOnEntering = xTickCount;
- }
- /*-----------------------------------------------------------*/
- BaseType_t xTaskCheckForTimeOut( TimeOut_t * const pxTimeOut, TickType_t * const pxTicksToWait )
- {
- BaseType_t xReturn;
- configASSERT( pxTimeOut );
- configASSERT( pxTicksToWait );
- taskENTER_CRITICAL();
- {
- /* Minor optimisation. The tick count cannot change in this block. */
- const TickType_t xConstTickCount = xTickCount;
- const TickType_t xElapsedTime = xConstTickCount - pxTimeOut->xTimeOnEntering;
- #if( INCLUDE_xTaskAbortDelay == 1 )
- if( pxCurrentTCB->ucDelayAborted != pdFALSE )
- {
- /* The delay was aborted, which is not the same as a time out,
- but has the same result. */
- pxCurrentTCB->ucDelayAborted = pdFALSE;
- xReturn = pdTRUE;
- }
- else
- #endif
- #if ( INCLUDE_vTaskSuspend == 1 )
- if( *pxTicksToWait == portMAX_DELAY )
- {
- /* If INCLUDE_vTaskSuspend is set to 1 and the block time
- specified is the maximum block time then the task should block
- indefinitely, and therefore never time out. */
- xReturn = pdFALSE;
- }
- else
- #endif
- if( ( xNumOfOverflows != pxTimeOut->xOverflowCount ) && ( xConstTickCount >= pxTimeOut->xTimeOnEntering ) ) /*lint !e525 Indentation preferred as is to make code within pre-processor directives clearer. */
- {
- /* The tick count is greater than the time at which
- vTaskSetTimeout() was called, but has also overflowed since
- vTaskSetTimeOut() was called. It must have wrapped all the way
- around and gone past again. This passed since vTaskSetTimeout()
- was called. */
- xReturn = pdTRUE;
- }
- else if( xElapsedTime < *pxTicksToWait ) /*lint !e961 Explicit casting is only redundant with some compilers, whereas others require it to prevent integer conversion errors. */
- {
- /* Not a genuine timeout. Adjust parameters for time remaining. */
- *pxTicksToWait -= xElapsedTime;
- vTaskInternalSetTimeOutState( pxTimeOut );
- xReturn = pdFALSE;
- }
- else
- {
- *pxTicksToWait = 0;
- xReturn = pdTRUE;
- }
- }
- taskEXIT_CRITICAL();
- return xReturn;
- }
- /*-----------------------------------------------------------*/
- void vTaskMissedYield( void )
- {
- xYieldPending = pdTRUE;
- }
- /*-----------------------------------------------------------*/
- #if ( configUSE_TRACE_FACILITY == 1 )
- UBaseType_t uxTaskGetTaskNumber( TaskHandle_t xTask )
- {
- UBaseType_t uxReturn;
- TCB_t *pxTCB;
- if( xTask != NULL )
- {
- pxTCB = ( TCB_t * ) xTask;
- uxReturn = pxTCB->uxTaskNumber;
- }
- else
- {
- uxReturn = 0U;
- }
- return uxReturn;
- }
- #endif /* configUSE_TRACE_FACILITY */
- /*-----------------------------------------------------------*/
- #if ( configUSE_TRACE_FACILITY == 1 )
- void vTaskSetTaskNumber( TaskHandle_t xTask, const UBaseType_t uxHandle )
- {
- TCB_t *pxTCB;
- if( xTask != NULL )
- {
- pxTCB = ( TCB_t * ) xTask;
- pxTCB->uxTaskNumber = uxHandle;
- }
- }
- #endif /* configUSE_TRACE_FACILITY */
- /*
- * -----------------------------------------------------------
- * The Idle task.
- * ----------------------------------------------------------
- *
- * The portTASK_FUNCTION() macro is used to allow port/compiler specific
- * language extensions. The equivalent prototype for this function is:
- *
- * void prvIdleTask( void *pvParameters );
- *
- */
- static portTASK_FUNCTION( prvIdleTask, pvParameters )
- {
- /* Stop warnings. */
- ( void ) pvParameters;
- /** THIS IS THE RTOS IDLE TASK - WHICH IS CREATED AUTOMATICALLY WHEN THE
- SCHEDULER IS STARTED. **/
- /* In case a task that has a secure context deletes itself, in which case
- the idle task is responsible for deleting the task's secure context, if
- any. */
- portTASK_CALLS_SECURE_FUNCTIONS();
- for( ;; )
- {
- /* See if any tasks have deleted themselves - if so then the idle task
- is responsible for freeing the deleted task's TCB and stack. */
- prvCheckTasksWaitingTermination();
- #if ( configUSE_PREEMPTION == 0 )
- {
- /* If we are not using preemption we keep forcing a task switch to
- see if any other task has become available. If we are using
- preemption we don't need to do this as any task becoming available
- will automatically get the processor anyway. */
- taskYIELD();
- }
- #endif /* configUSE_PREEMPTION */
- #if ( ( configUSE_PREEMPTION == 1 ) && ( configIDLE_SHOULD_YIELD == 1 ) )
- {
- /* When using preemption tasks of equal priority will be
- timesliced. If a task that is sharing the idle priority is ready
- to run then the idle task should yield before the end of the
- timeslice.
- A critical region is not required here as we are just reading from
- the list, and an occasional incorrect value will not matter. If
- the ready list at the idle priority contains more than one task
- then a task other than the idle task is ready to execute. */
- if( listCURRENT_LIST_LENGTH( &( pxReadyTasksLists[ tskIDLE_PRIORITY ] ) ) > ( UBaseType_t ) 1 )
- {
- taskYIELD();
- }
- else
- {
- mtCOVERAGE_TEST_MARKER();
- }
- }
- #endif /* ( ( configUSE_PREEMPTION == 1 ) && ( configIDLE_SHOULD_YIELD == 1 ) ) */
- #if ( configUSE_IDLE_HOOK == 1 )
- {
- extern void vApplicationIdleHook( void );
- /* Call the user defined function from within the idle task. This
- allows the application designer to add background functionality
- without the overhead of a separate task.
- NOTE: vApplicationIdleHook() MUST NOT, UNDER ANY CIRCUMSTANCES,
- CALL A FUNCTION THAT MIGHT BLOCK. */
- vApplicationIdleHook();
- }
- #endif /* configUSE_IDLE_HOOK */
- /* This conditional compilation should use inequality to 0, not equality
- to 1. This is to ensure portSUPPRESS_TICKS_AND_SLEEP() is called when
- user defined low power mode implementations require
- configUSE_TICKLESS_IDLE to be set to a value other than 1. */
- #if ( configUSE_TICKLESS_IDLE != 0 )
- {
- TickType_t xExpectedIdleTime;
- /* It is not desirable to suspend then resume the scheduler on
- each iteration of the idle task. Therefore, a preliminary
- test of the expected idle time is performed without the
- scheduler suspended. The result here is not necessarily
- valid. */
- xExpectedIdleTime = prvGetExpectedIdleTime();
- if( xExpectedIdleTime >= configEXPECTED_IDLE_TIME_BEFORE_SLEEP )
- {
- vTaskSuspendAll();
- {
- /* Now the scheduler is suspended, the expected idle
- time can be sampled again, and this time its value can
- be used. */
- configASSERT( xNextTaskUnblockTime >= xTickCount );
- xExpectedIdleTime = prvGetExpectedIdleTime();
- /* Define the following macro to set xExpectedIdleTime to 0
- if the application does not want
- portSUPPRESS_TICKS_AND_SLEEP() to be called. */
- configPRE_SUPPRESS_TICKS_AND_SLEEP_PROCESSING( xExpectedIdleTime );
- if( xExpectedIdleTime >= configEXPECTED_IDLE_TIME_BEFORE_SLEEP )
- {
- traceLOW_POWER_IDLE_BEGIN();
- portSUPPRESS_TICKS_AND_SLEEP( xExpectedIdleTime );
- traceLOW_POWER_IDLE_END();
- }
- else
- {
- mtCOVERAGE_TEST_MARKER();
- }
- }
- ( void ) xTaskResumeAll();
- }
- else
- {
- mtCOVERAGE_TEST_MARKER();
- }
- }
- #endif /* configUSE_TICKLESS_IDLE */
- }
- }
- /*-----------------------------------------------------------*/
- #if( configUSE_TICKLESS_IDLE != 0 )
- eSleepModeStatus eTaskConfirmSleepModeStatus( void )
- {
- /* The idle task exists in addition to the application tasks. */
- const UBaseType_t uxNonApplicationTasks = 1;
- eSleepModeStatus eReturn = eStandardSleep;
- if( listCURRENT_LIST_LENGTH( &xPendingReadyList ) != 0 )
- {
- /* A task was made ready while the scheduler was suspended. */
- eReturn = eAbortSleep;
- }
- else if( xYieldPending != pdFALSE )
- {
- /* A yield was pended while the scheduler was suspended. */
- eReturn = eAbortSleep;
- }
- else
- {
- /* If all the tasks are in the suspended list (which might mean they
- have an infinite block time rather than actually being suspended)
- then it is safe to turn all clocks off and just wait for external
- interrupts. */
- if( listCURRENT_LIST_LENGTH( &xSuspendedTaskList ) == ( uxCurrentNumberOfTasks - uxNonApplicationTasks ) )
- {
- eReturn = eNoTasksWaitingTimeout;
- }
- else
- {
- mtCOVERAGE_TEST_MARKER();
- }
- }
- return eReturn;
- }
- #endif /* configUSE_TICKLESS_IDLE */
- /*-----------------------------------------------------------*/
- #if ( configNUM_THREAD_LOCAL_STORAGE_POINTERS != 0 )
- void vTaskSetThreadLocalStoragePointer( TaskHandle_t xTaskToSet, BaseType_t xIndex, void *pvValue )
- {
- TCB_t *pxTCB;
- if( xIndex < configNUM_THREAD_LOCAL_STORAGE_POINTERS )
- {
- pxTCB = prvGetTCBFromHandle( xTaskToSet );
- pxTCB->pvThreadLocalStoragePointers[ xIndex ] = pvValue;
- }
- }
- #endif /* configNUM_THREAD_LOCAL_STORAGE_POINTERS */
- /*-----------------------------------------------------------*/
- #if ( configNUM_THREAD_LOCAL_STORAGE_POINTERS != 0 )
- void *pvTaskGetThreadLocalStoragePointer( TaskHandle_t xTaskToQuery, BaseType_t xIndex )
- {
- void *pvReturn = NULL;
- TCB_t *pxTCB;
- if( xIndex < configNUM_THREAD_LOCAL_STORAGE_POINTERS )
- {
- pxTCB = prvGetTCBFromHandle( xTaskToQuery );
- pvReturn = pxTCB->pvThreadLocalStoragePointers[ xIndex ];
- }
- else
- {
- pvReturn = NULL;
- }
- return pvReturn;
- }
- #endif /* configNUM_THREAD_LOCAL_STORAGE_POINTERS */
- /*-----------------------------------------------------------*/
- #if ( portUSING_MPU_WRAPPERS == 1 )
- void vTaskAllocateMPURegions( TaskHandle_t xTaskToModify, const MemoryRegion_t * const xRegions )
- {
- TCB_t *pxTCB;
- /* If null is passed in here then we are modifying the MPU settings of
- the calling task. */
- pxTCB = prvGetTCBFromHandle( xTaskToModify );
- vPortStoreTaskMPUSettings( &( pxTCB->xMPUSettings ), xRegions, NULL, 0 );
- }
- #endif /* portUSING_MPU_WRAPPERS */
- /*-----------------------------------------------------------*/
- static void prvInitialiseTaskLists( void )
- {
- UBaseType_t uxPriority;
- for( uxPriority = ( UBaseType_t ) 0U; uxPriority < ( UBaseType_t ) configMAX_PRIORITIES; uxPriority++ )
- {
- vListInitialise( &( pxReadyTasksLists[ uxPriority ] ) );
- }
- vListInitialise( &xDelayedTaskList1 );
- vListInitialise( &xDelayedTaskList2 );
- vListInitialise( &xPendingReadyList );
- #if ( INCLUDE_vTaskDelete == 1 )
- {
- vListInitialise( &xTasksWaitingTermination );
- }
- #endif /* INCLUDE_vTaskDelete */
- #if ( INCLUDE_vTaskSuspend == 1 )
- {
- vListInitialise( &xSuspendedTaskList );
- }
- #endif /* INCLUDE_vTaskSuspend */
- /* Start with pxDelayedTaskList using list1 and the pxOverflowDelayedTaskList
- using list2. */
- pxDelayedTaskList = &xDelayedTaskList1;
- pxOverflowDelayedTaskList = &xDelayedTaskList2;
- }
- /*-----------------------------------------------------------*/
- static void prvCheckTasksWaitingTermination( void )
- {
- /** THIS FUNCTION IS CALLED FROM THE RTOS IDLE TASK **/
- #if ( INCLUDE_vTaskDelete == 1 )
- {
- TCB_t *pxTCB;
- /* uxDeletedTasksWaitingCleanUp is used to prevent vTaskSuspendAll()
- being called too often in the idle task. */
- while( uxDeletedTasksWaitingCleanUp > ( UBaseType_t ) 0U )
- {
- taskENTER_CRITICAL();
- {
- pxTCB = ( TCB_t * ) listGET_OWNER_OF_HEAD_ENTRY( ( &xTasksWaitingTermination ) );
- ( void ) uxListRemove( &( pxTCB->xStateListItem ) );
- --uxCurrentNumberOfTasks;
- --uxDeletedTasksWaitingCleanUp;
- }
- taskEXIT_CRITICAL();
- prvDeleteTCB( pxTCB );
- }
- }
- #endif /* INCLUDE_vTaskDelete */
- }
- /*-----------------------------------------------------------*/
- #if( configUSE_TRACE_FACILITY == 1 )
- void vTaskGetInfo( TaskHandle_t xTask, TaskStatus_t *pxTaskStatus, BaseType_t xGetFreeStackSpace, eTaskState eState )
- {
- TCB_t *pxTCB;
- /* xTask is NULL then get the state of the calling task. */
- pxTCB = prvGetTCBFromHandle( xTask );
- pxTaskStatus->xHandle = ( TaskHandle_t ) pxTCB;
- pxTaskStatus->pcTaskName = ( const char * ) &( pxTCB->pcTaskName [ 0 ] );
- pxTaskStatus->uxCurrentPriority = pxTCB->uxPriority;
- pxTaskStatus->pxStackBase = pxTCB->pxStack;
- pxTaskStatus->xTaskNumber = pxTCB->uxTCBNumber;
- #if ( configUSE_MUTEXES == 1 )
- {
- pxTaskStatus->uxBasePriority = pxTCB->uxBasePriority;
- }
- #else
- {
- pxTaskStatus->uxBasePriority = 0;
- }
- #endif
- #if ( configGENERATE_RUN_TIME_STATS == 1 )
- {
- pxTaskStatus->ulRunTimeCounter = pxTCB->ulRunTimeCounter;
- }
- #else
- {
- pxTaskStatus->ulRunTimeCounter = 0;
- }
- #endif
- /* Obtaining the task state is a little fiddly, so is only done if the
- value of eState passed into this function is eInvalid - otherwise the
- state is just set to whatever is passed in. */
- if( eState != eInvalid )
- {
- if( pxTCB == pxCurrentTCB )
- {
- pxTaskStatus->eCurrentState = eRunning;
- }
- else
- {
- pxTaskStatus->eCurrentState = eState;
- #if ( INCLUDE_vTaskSuspend == 1 )
- {
- /* If the task is in the suspended list then there is a
- chance it is actually just blocked indefinitely - so really
- it should be reported as being in the Blocked state. */
- if( eState == eSuspended )
- {
- vTaskSuspendAll();
- {
- if( listLIST_ITEM_CONTAINER( &( pxTCB->xEventListItem ) ) != NULL )
- {
- pxTaskStatus->eCurrentState = eBlocked;
- }
- }
- ( void ) xTaskResumeAll();
- }
- }
- #endif /* INCLUDE_vTaskSuspend */
- }
- }
- else
- {
- pxTaskStatus->eCurrentState = eTaskGetState( pxTCB );
- }
- /* Obtaining the stack space takes some time, so the xGetFreeStackSpace
- parameter is provided to allow it to be skipped. */
- if( xGetFreeStackSpace != pdFALSE )
- {
- #if ( portSTACK_GROWTH > 0 )
- {
- pxTaskStatus->usStackHighWaterMark = prvTaskCheckFreeStackSpace( ( uint8_t * ) pxTCB->pxEndOfStack );
- }
- #else
- {
- pxTaskStatus->usStackHighWaterMark = prvTaskCheckFreeStackSpace( ( uint8_t * ) pxTCB->pxStack );
- }
- #endif
- }
- else
- {
- pxTaskStatus->usStackHighWaterMark = 0;
- }
- }
- #endif /* configUSE_TRACE_FACILITY */
- /*-----------------------------------------------------------*/
- #if ( configUSE_TRACE_FACILITY == 1 )
- static UBaseType_t prvListTasksWithinSingleList( TaskStatus_t *pxTaskStatusArray, List_t *pxList, eTaskState eState )
- {
- configLIST_VOLATILE TCB_t *pxNextTCB, *pxFirstTCB;
- UBaseType_t uxTask = 0;
- if( listCURRENT_LIST_LENGTH( pxList ) > ( UBaseType_t ) 0 )
- {
- listGET_OWNER_OF_NEXT_ENTRY( pxFirstTCB, pxList );
- /* Populate an TaskStatus_t structure within the
- pxTaskStatusArray array for each task that is referenced from
- pxList. See the definition of TaskStatus_t in task.h for the
- meaning of each TaskStatus_t structure member. */
- do
- {
- listGET_OWNER_OF_NEXT_ENTRY( pxNextTCB, pxList );
- vTaskGetInfo( ( TaskHandle_t ) pxNextTCB, &( pxTaskStatusArray[ uxTask ] ), pdTRUE, eState );
- uxTask++;
- } while( pxNextTCB != pxFirstTCB );
- }
- else
- {
- mtCOVERAGE_TEST_MARKER();
- }
- return uxTask;
- }
- #endif /* configUSE_TRACE_FACILITY */
- /*-----------------------------------------------------------*/
- #if ( ( configUSE_TRACE_FACILITY == 1 ) || ( INCLUDE_uxTaskGetStackHighWaterMark == 1 ) )
- static uint16_t prvTaskCheckFreeStackSpace( const uint8_t * pucStackByte )
- {
- uint32_t ulCount = 0U;
- while( *pucStackByte == ( uint8_t ) tskSTACK_FILL_BYTE )
- {
- pucStackByte -= portSTACK_GROWTH;
- ulCount++;
- }
- ulCount /= ( uint32_t ) sizeof( StackType_t ); /*lint !e961 Casting is not redundant on smaller architectures. */
- return ( uint16_t ) ulCount;
- }
- #endif /* ( ( configUSE_TRACE_FACILITY == 1 ) || ( INCLUDE_uxTaskGetStackHighWaterMark == 1 ) ) */
- /*-----------------------------------------------------------*/
- #if ( INCLUDE_uxTaskGetStackHighWaterMark == 1 )
- UBaseType_t uxTaskGetStackHighWaterMark( TaskHandle_t xTask )
- {
- TCB_t *pxTCB;
- uint8_t *pucEndOfStack;
- UBaseType_t uxReturn;
- pxTCB = prvGetTCBFromHandle( xTask );
- #if portSTACK_GROWTH < 0
- {
- pucEndOfStack = ( uint8_t * ) pxTCB->pxStack;
- }
- #else
- {
- pucEndOfStack = ( uint8_t * ) pxTCB->pxEndOfStack;
- }
- #endif
- uxReturn = ( UBaseType_t ) prvTaskCheckFreeStackSpace( pucEndOfStack );
- return uxReturn;
- }
- #endif /* INCLUDE_uxTaskGetStackHighWaterMark */
- /*-----------------------------------------------------------*/
- #if ( INCLUDE_vTaskDelete == 1 )
- static void prvDeleteTCB( TCB_t *pxTCB )
- {
- /* This call is required specifically for the TriCore port. It must be
- above the vPortFree() calls. The call is also used by ports/demos that
- want to allocate and clean RAM statically. */
- portCLEAN_UP_TCB( pxTCB );
- /* Free up the memory allocated by the scheduler for the task. It is up
- to the task to free any memory allocated at the application level. */
- #if ( configUSE_NEWLIB_REENTRANT == 1 )
- {
- _reclaim_reent( &( pxTCB->xNewLib_reent ) );
- }
- #endif /* configUSE_NEWLIB_REENTRANT */
- #if( ( configSUPPORT_DYNAMIC_ALLOCATION == 1 ) && ( configSUPPORT_STATIC_ALLOCATION == 0 ) && ( portUSING_MPU_WRAPPERS == 0 ) )
- {
- /* The task can only have been allocated dynamically - free both
- the stack and TCB. */
- vPortFree( pxTCB->pxStack );
- vPortFree( pxTCB );
- }
- #elif( tskSTATIC_AND_DYNAMIC_ALLOCATION_POSSIBLE != 0 ) /*lint !e731 Macro has been consolidated for readability reasons. */
- {
- /* The task could have been allocated statically or dynamically, so
- check what was statically allocated before trying to free the
- memory. */
- if( pxTCB->ucStaticallyAllocated == tskDYNAMICALLY_ALLOCATED_STACK_AND_TCB )
- {
- /* Both the stack and TCB were allocated dynamically, so both
- must be freed. */
- vPortFree( pxTCB->pxStack );
- vPortFree( pxTCB );
- }
- else if( pxTCB->ucStaticallyAllocated == tskSTATICALLY_ALLOCATED_STACK_ONLY )
- {
- /* Only the stack was statically allocated, so the TCB is the
- only memory that must be freed. */
- vPortFree( pxTCB );
- }
- else
- {
- /* Neither the stack nor the TCB were allocated dynamically, so
- nothing needs to be freed. */
- configASSERT( pxTCB->ucStaticallyAllocated == tskSTATICALLY_ALLOCATED_STACK_AND_TCB );
- mtCOVERAGE_TEST_MARKER();
- }
- }
- #endif /* configSUPPORT_DYNAMIC_ALLOCATION */
- }
- #endif /* INCLUDE_vTaskDelete */
- /*-----------------------------------------------------------*/
- static void prvResetNextTaskUnblockTime( void )
- {
- TCB_t *pxTCB;
- if( listLIST_IS_EMPTY( pxDelayedTaskList ) != pdFALSE )
- {
- /* The new current delayed list is empty. Set xNextTaskUnblockTime to
- the maximum possible value so it is extremely unlikely that the
- if( xTickCount >= xNextTaskUnblockTime ) test will pass until
- there is an item in the delayed list. */
- xNextTaskUnblockTime = portMAX_DELAY;
- }
- else
- {
- /* The new current delayed list is not empty, get the value of
- the item at the head of the delayed list. This is the time at
- which the task at the head of the delayed list should be removed
- from the Blocked state. */
- ( pxTCB ) = ( TCB_t * ) listGET_OWNER_OF_HEAD_ENTRY( pxDelayedTaskList );
- xNextTaskUnblockTime = listGET_LIST_ITEM_VALUE( &( ( pxTCB )->xStateListItem ) );
- }
- }
- /*-----------------------------------------------------------*/
- #if ( ( INCLUDE_xTaskGetCurrentTaskHandle == 1 ) || ( configUSE_MUTEXES == 1 ) )
- TaskHandle_t xTaskGetCurrentTaskHandle( void )
- {
- TaskHandle_t xReturn;
- /* A critical section is not required as this is not called from
- an interrupt and the current TCB will always be the same for any
- individual execution thread. */
- xReturn = pxCurrentTCB;
- return xReturn;
- }
- #endif /* ( ( INCLUDE_xTaskGetCurrentTaskHandle == 1 ) || ( configUSE_MUTEXES == 1 ) ) */
- /*-----------------------------------------------------------*/
- #if ( ( INCLUDE_xTaskGetSchedulerState == 1 ) || ( configUSE_TIMERS == 1 ) )
- BaseType_t xTaskGetSchedulerState( void )
- {
- BaseType_t xReturn;
- if( xSchedulerRunning == pdFALSE )
- {
- xReturn = taskSCHEDULER_NOT_STARTED;
- }
- else
- {
- if( uxSchedulerSuspended == ( UBaseType_t ) pdFALSE )
- {
- xReturn = taskSCHEDULER_RUNNING;
- }
- else
- {
- xReturn = taskSCHEDULER_SUSPENDED;
- }
- }
- return xReturn;
- }
- #endif /* ( ( INCLUDE_xTaskGetSchedulerState == 1 ) || ( configUSE_TIMERS == 1 ) ) */
- /*-----------------------------------------------------------*/
- #if ( configUSE_MUTEXES == 1 )
- BaseType_t xTaskPriorityInherit( TaskHandle_t const pxMutexHolder )
- {
- TCB_t * const pxMutexHolderTCB = ( TCB_t * ) pxMutexHolder;
- BaseType_t xReturn = pdFALSE;
- /* If the mutex was given back by an interrupt while the queue was
- locked then the mutex holder might now be NULL. _RB_ Is this still
- needed as interrupts can no longer use mutexes? */
- if( pxMutexHolder != NULL )
- {
- /* If the holder of the mutex has a priority below the priority of
- the task attempting to obtain the mutex then it will temporarily
- inherit the priority of the task attempting to obtain the mutex. */
- if( pxMutexHolderTCB->uxPriority < pxCurrentTCB->uxPriority )
- {
- /* Adjust the mutex holder state to account for its new
- priority. Only reset the event list item value if the value is
- not being used for anything else. */
- if( ( listGET_LIST_ITEM_VALUE( &( pxMutexHolderTCB->xEventListItem ) ) & taskEVENT_LIST_ITEM_VALUE_IN_USE ) == 0UL )
- {
- 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. */
- }
- else
- {
- mtCOVERAGE_TEST_MARKER();
- }
- /* If the task being modified is in the ready state it will need
- to be moved into a new list. */
- if( listIS_CONTAINED_WITHIN( &( pxReadyTasksLists[ pxMutexHolderTCB->uxPriority ] ), &( pxMutexHolderTCB->xStateListItem ) ) != pdFALSE )
- {
- if( uxListRemove( &( pxMutexHolderTCB->xStateListItem ) ) == ( UBaseType_t ) 0 )
- {
- taskRESET_READY_PRIORITY( pxMutexHolderTCB->uxPriority );
- }
- else
- {
- mtCOVERAGE_TEST_MARKER();
- }
- /* Inherit the priority before being moved into the new list. */
- pxMutexHolderTCB->uxPriority = pxCurrentTCB->uxPriority;
- prvAddTaskToReadyList( pxMutexHolderTCB );
- }
- else
- {
- /* Just inherit the priority. */
- pxMutexHolderTCB->uxPriority = pxCurrentTCB->uxPriority;
- }
- traceTASK_PRIORITY_INHERIT( pxMutexHolderTCB, pxCurrentTCB->uxPriority );
- /* Inheritance occurred. */
- xReturn = pdTRUE;
- }
- else
- {
- if( pxMutexHolderTCB->uxBasePriority < pxCurrentTCB->uxPriority )
- {
- /* The base priority of the mutex holder is lower than the
- priority of the task attempting to take the mutex, but the
- current priority of the mutex holder is not lower than the
- priority of the task attempting to take the mutex.
- Therefore the mutex holder must have already inherited a
- priority, but inheritance would have occurred if that had
- not been the case. */
- xReturn = pdTRUE;
- }
- else
- {
- mtCOVERAGE_TEST_MARKER();
- }
- }
- }
- else
- {
- mtCOVERAGE_TEST_MARKER();
- }
- return xReturn;
- }
- #endif /* configUSE_MUTEXES */
- /*-----------------------------------------------------------*/
- #if ( configUSE_MUTEXES == 1 )
- BaseType_t xTaskPriorityDisinherit( TaskHandle_t const pxMutexHolder )
- {
- TCB_t * const pxTCB = ( TCB_t * ) pxMutexHolder;
- BaseType_t xReturn = pdFALSE;
- if( pxMutexHolder != NULL )
- {
- /* A task can only have an inherited priority if it holds the mutex.
- If the mutex is held by a task then it cannot be given from an
- interrupt, and if a mutex is given by the holding task then it must
- be the running state task. */
- configASSERT( pxTCB == pxCurrentTCB );
- configASSERT( pxTCB->uxMutexesHeld );
- ( pxTCB->uxMutexesHeld )--;
- /* Has the holder of the mutex inherited the priority of another
- task? */
- if( pxTCB->uxPriority != pxTCB->uxBasePriority )
- {
- /* Only disinherit if no other mutexes are held. */
- if( pxTCB->uxMutexesHeld == ( UBaseType_t ) 0 )
- {
- /* A task can only have an inherited priority if it holds
- the mutex. If the mutex is held by a task then it cannot be
- given from an interrupt, and if a mutex is given by the
- holding task then it must be the running state task. Remove
- the holding task from the ready list. */
- if( uxListRemove( &( pxTCB->xStateListItem ) ) == ( UBaseType_t ) 0 )
- {
- taskRESET_READY_PRIORITY( pxTCB->uxPriority );
- }
- else
- {
- mtCOVERAGE_TEST_MARKER();
- }
- /* Disinherit the priority before adding the task into the
- new ready list. */
- traceTASK_PRIORITY_DISINHERIT( pxTCB, pxTCB->uxBasePriority );
- pxTCB->uxPriority = pxTCB->uxBasePriority;
- /* Reset the event list item value. It cannot be in use for
- any other purpose if this task is running, and it must be
- running to give back the mutex. */
- 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. */
- prvAddTaskToReadyList( pxTCB );
- /* Return true to indicate that a context switch is required.
- This is only actually required in the corner case whereby
- multiple mutexes were held and the mutexes were given back
- in an order different to that in which they were taken.
- If a context switch did not occur when the first mutex was
- returned, even if a task was waiting on it, then a context
- switch should occur when the last mutex is returned whether
- a task is waiting on it or not. */
- xReturn = pdTRUE;
- }
- else
- {
- mtCOVERAGE_TEST_MARKER();
- }
- }
- else
- {
- mtCOVERAGE_TEST_MARKER();
- }
- }
- else
- {
- mtCOVERAGE_TEST_MARKER();
- }
- return xReturn;
- }
- #endif /* configUSE_MUTEXES */
- /*-----------------------------------------------------------*/
- #if ( configUSE_MUTEXES == 1 )
- void vTaskPriorityDisinheritAfterTimeout( TaskHandle_t const pxMutexHolder, UBaseType_t uxHighestPriorityWaitingTask )
- {
- TCB_t * const pxTCB = ( TCB_t * ) pxMutexHolder;
- UBaseType_t uxPriorityUsedOnEntry, uxPriorityToUse;
- const UBaseType_t uxOnlyOneMutexHeld = ( UBaseType_t ) 1;
- if( pxMutexHolder != NULL )
- {
- /* If pxMutexHolder is not NULL then the holder must hold at least
- one mutex. */
- configASSERT( pxTCB->uxMutexesHeld );
- /* Determine the priority to which the priority of the task that
- holds the mutex should be set. This will be the greater of the
- holding task's base priority and the priority of the highest
- priority task that is waiting to obtain the mutex. */
- if( pxTCB->uxBasePriority < uxHighestPriorityWaitingTask )
- {
- uxPriorityToUse = uxHighestPriorityWaitingTask;
- }
- else
- {
- uxPriorityToUse = pxTCB->uxBasePriority;
- }
- /* Does the priority need to change? */
- if( pxTCB->uxPriority != uxPriorityToUse )
- {
- /* Only disinherit if no other mutexes are held. This is a
- simplification in the priority inheritance implementation. If
- the task that holds the mutex is also holding other mutexes then
- the other mutexes may have caused the priority inheritance. */
- if( pxTCB->uxMutexesHeld == uxOnlyOneMutexHeld )
- {
- /* If a task has timed out because it already holds the
- mutex it was trying to obtain then it cannot of inherited
- its own priority. */
- configASSERT( pxTCB != pxCurrentTCB );
- /* Disinherit the priority, remembering the previous
- priority to facilitate determining the subject task's
- state. */
- traceTASK_PRIORITY_DISINHERIT( pxTCB, pxTCB->uxBasePriority );
- uxPriorityUsedOnEntry = pxTCB->uxPriority;
- pxTCB->uxPriority = uxPriorityToUse;
- /* Only reset the event list item value if the value is not
- being used for anything else. */
- if( ( listGET_LIST_ITEM_VALUE( &( pxTCB->xEventListItem ) ) & taskEVENT_LIST_ITEM_VALUE_IN_USE ) == 0UL )
- {
- 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. */
- }
- else
- {
- mtCOVERAGE_TEST_MARKER();
- }
- /* If the running task is not the task that holds the mutex
- then the task that holds the mutex could be in either the
- Ready, Blocked or Suspended states. Only remove the task
- from its current state list if it is in the Ready state as
- the task's priority is going to change and there is one
- Ready list per priority. */
- if( listIS_CONTAINED_WITHIN( &( pxReadyTasksLists[ uxPriorityUsedOnEntry ] ), &( pxTCB->xStateListItem ) ) != pdFALSE )
- {
- if( uxListRemove( &( pxTCB->xStateListItem ) ) == ( UBaseType_t ) 0 )
- {
- taskRESET_READY_PRIORITY( pxTCB->uxPriority );
- }
- else
- {
- mtCOVERAGE_TEST_MARKER();
- }
- prvAddTaskToReadyList( pxTCB );
- }
- else
- {
- mtCOVERAGE_TEST_MARKER();
- }
- }
- else
- {
- mtCOVERAGE_TEST_MARKER();
- }
- }
- else
- {
- mtCOVERAGE_TEST_MARKER();
- }
- }
- else
- {
- mtCOVERAGE_TEST_MARKER();
- }
- }
- #endif /* configUSE_MUTEXES */
- /*-----------------------------------------------------------*/
- #if ( portCRITICAL_NESTING_IN_TCB == 1 )
- void vTaskEnterCritical( void )
- {
- portDISABLE_INTERRUPTS();
- if( xSchedulerRunning != pdFALSE )
- {
- ( pxCurrentTCB->uxCriticalNesting )++;
- /* This is not the interrupt safe version of the enter critical
- function so assert() if it is being called from an interrupt
- context. Only API functions that end in "FromISR" can be used in an
- interrupt. Only assert if the critical nesting count is 1 to
- protect against recursive calls if the assert function also uses a
- critical section. */
- if( pxCurrentTCB->uxCriticalNesting == 1 )
- {
- portASSERT_IF_IN_ISR();
- }
- }
- else
- {
- mtCOVERAGE_TEST_MARKER();
- }
- }
- #endif /* portCRITICAL_NESTING_IN_TCB */
- /*-----------------------------------------------------------*/
- #if ( portCRITICAL_NESTING_IN_TCB == 1 )
- void vTaskExitCritical( void )
- {
- if( xSchedulerRunning != pdFALSE )
- {
- if( pxCurrentTCB->uxCriticalNesting > 0U )
- {
- ( pxCurrentTCB->uxCriticalNesting )--;
- if( pxCurrentTCB->uxCriticalNesting == 0U )
- {
- portENABLE_INTERRUPTS();
- }
- else
- {
- mtCOVERAGE_TEST_MARKER();
- }
- }
- else
- {
- mtCOVERAGE_TEST_MARKER();
- }
- }
- else
- {
- mtCOVERAGE_TEST_MARKER();
- }
- }
- #endif /* portCRITICAL_NESTING_IN_TCB */
- /*-----------------------------------------------------------*/
- #if ( ( configUSE_TRACE_FACILITY == 1 ) && ( configUSE_STATS_FORMATTING_FUNCTIONS > 0 ) )
- static char *prvWriteNameToBuffer( char *pcBuffer, const char *pcTaskName )
- {
- size_t x;
- /* Start by copying the entire string. */
- strcpy( pcBuffer, pcTaskName );
- /* Pad the end of the string with spaces to ensure columns line up when
- printed out. */
- for( x = strlen( pcBuffer ); x < ( size_t ) ( configMAX_TASK_NAME_LEN - 1 ); x++ )
- {
- pcBuffer[ x ] = ' ';
- }
- /* Terminate. */
- pcBuffer[ x ] = 0x00;
- /* Return the new end of string. */
- return &( pcBuffer[ x ] );
- }
- #endif /* ( configUSE_TRACE_FACILITY == 1 ) && ( configUSE_STATS_FORMATTING_FUNCTIONS > 0 ) */
- /*-----------------------------------------------------------*/
- #if ( ( configUSE_TRACE_FACILITY == 1 ) && ( configUSE_STATS_FORMATTING_FUNCTIONS > 0 ) && ( configSUPPORT_DYNAMIC_ALLOCATION == 1 ) )
- void vTaskList( char * pcWriteBuffer )
- {
- TaskStatus_t *pxTaskStatusArray;
- volatile UBaseType_t uxArraySize, x;
- char cStatus;
- /*
- * PLEASE NOTE:
- *
- * This function is provided for convenience only, and is used by many
- * of the demo applications. Do not consider it to be part of the
- * scheduler.
- *
- * vTaskList() calls uxTaskGetSystemState(), then formats part of the
- * uxTaskGetSystemState() output into a human readable table that
- * displays task names, states and stack usage.
- *
- * vTaskList() has a dependency on the sprintf() C library function that
- * might bloat the code size, use a lot of stack, and provide different
- * results on different platforms. An alternative, tiny, third party,
- * and limited functionality implementation of sprintf() is provided in
- * many of the FreeRTOS/Demo sub-directories in a file called
- * printf-stdarg.c (note printf-stdarg.c does not provide a full
- * snprintf() implementation!).
- *
- * It is recommended that production systems call uxTaskGetSystemState()
- * directly to get access to raw stats data, rather than indirectly
- * through a call to vTaskList().
- */
- /* Make sure the write buffer does not contain a string. */
- *pcWriteBuffer = 0x00;
- /* Take a snapshot of the number of tasks in case it changes while this
- function is executing. */
- uxArraySize = uxCurrentNumberOfTasks;
- /* Allocate an array index for each task. NOTE! if
- configSUPPORT_DYNAMIC_ALLOCATION is set to 0 then pvPortMalloc() will
- equate to NULL. */
- pxTaskStatusArray = pvPortMalloc( uxCurrentNumberOfTasks * sizeof( TaskStatus_t ) );
- if( pxTaskStatusArray != NULL )
- {
- /* Generate the (binary) data. */
- uxArraySize = uxTaskGetSystemState( pxTaskStatusArray, uxArraySize, NULL );
- /* Create a human readable table from the binary data. */
- for( x = 0; x < uxArraySize; x++ )
- {
- switch( pxTaskStatusArray[ x ].eCurrentState )
- {
- case eRunning: cStatus = tskRUNNING_CHAR;
- break;
- case eReady: cStatus = tskREADY_CHAR;
- break;
- case eBlocked: cStatus = tskBLOCKED_CHAR;
- break;
- case eSuspended: cStatus = tskSUSPENDED_CHAR;
- break;
- case eDeleted: cStatus = tskDELETED_CHAR;
- break;
- default: /* Should not get here, but it is included
- to prevent static checking errors. */
- cStatus = 0x00;
- break;
- }
- /* Write the task name to the string, padding with spaces so it
- can be printed in tabular form more easily. */
- pcWriteBuffer = prvWriteNameToBuffer( pcWriteBuffer, pxTaskStatusArray[ x ].pcTaskName );
- /* Write the rest of the string. */
- 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 );
- pcWriteBuffer += strlen( pcWriteBuffer );
- }
- /* Free the array again. NOTE! If configSUPPORT_DYNAMIC_ALLOCATION
- is 0 then vPortFree() will be #defined to nothing. */
- vPortFree( pxTaskStatusArray );
- }
- else
- {
- mtCOVERAGE_TEST_MARKER();
- }
- }
- #endif /* ( ( configUSE_TRACE_FACILITY == 1 ) && ( configUSE_STATS_FORMATTING_FUNCTIONS > 0 ) && ( configSUPPORT_DYNAMIC_ALLOCATION == 1 ) ) */
- /*----------------------------------------------------------*/
- #if ( ( configGENERATE_RUN_TIME_STATS == 1 ) && ( configUSE_STATS_FORMATTING_FUNCTIONS > 0 ) && ( configSUPPORT_DYNAMIC_ALLOCATION == 1 ) )
- void vTaskGetRunTimeStats( char *pcWriteBuffer )
- {
- TaskStatus_t *pxTaskStatusArray;
- volatile UBaseType_t uxArraySize, x;
- uint32_t ulTotalTime, ulStatsAsPercentage;
- #if( configUSE_TRACE_FACILITY != 1 )
- {
- #error configUSE_TRACE_FACILITY must also be set to 1 in FreeRTOSConfig.h to use vTaskGetRunTimeStats().
- }
- #endif
- /*
- * PLEASE NOTE:
- *
- * This function is provided for convenience only, and is used by many
- * of the demo applications. Do not consider it to be part of the
- * scheduler.
- *
- * vTaskGetRunTimeStats() calls uxTaskGetSystemState(), then formats part
- * of the uxTaskGetSystemState() output into a human readable table that
- * displays the amount of time each task has spent in the Running state
- * in both absolute and percentage terms.
- *
- * vTaskGetRunTimeStats() has a dependency on the sprintf() C library
- * function that might bloat the code size, use a lot of stack, and
- * provide different results on different platforms. An alternative,
- * tiny, third party, and limited functionality implementation of
- * sprintf() is provided in many of the FreeRTOS/Demo sub-directories in
- * a file called printf-stdarg.c (note printf-stdarg.c does not provide
- * a full snprintf() implementation!).
- *
- * It is recommended that production systems call uxTaskGetSystemState()
- * directly to get access to raw stats data, rather than indirectly
- * through a call to vTaskGetRunTimeStats().
- */
- /* Make sure the write buffer does not contain a string. */
- *pcWriteBuffer = 0x00;
- /* Take a snapshot of the number of tasks in case it changes while this
- function is executing. */
- uxArraySize = uxCurrentNumberOfTasks;
- /* Allocate an array index for each task. NOTE! If
- configSUPPORT_DYNAMIC_ALLOCATION is set to 0 then pvPortMalloc() will
- equate to NULL. */
- pxTaskStatusArray = pvPortMalloc( uxCurrentNumberOfTasks * sizeof( TaskStatus_t ) );
- if( pxTaskStatusArray != NULL )
- {
- /* Generate the (binary) data. */
- uxArraySize = uxTaskGetSystemState( pxTaskStatusArray, uxArraySize, &ulTotalTime );
- /* For percentage calculations. */
- ulTotalTime /= 100UL;
- /* Avoid divide by zero errors. */
- if( ulTotalTime > 0 )
- {
- /* Create a human readable table from the binary data. */
- for( x = 0; x < uxArraySize; x++ )
- {
- /* What percentage of the total run time has the task used?
- This will always be rounded down to the nearest integer.
- ulTotalRunTimeDiv100 has already been divided by 100. */
- ulStatsAsPercentage = pxTaskStatusArray[ x ].ulRunTimeCounter / ulTotalTime;
- /* Write the task name to the string, padding with
- spaces so it can be printed in tabular form more
- easily. */
- pcWriteBuffer = prvWriteNameToBuffer( pcWriteBuffer, pxTaskStatusArray[ x ].pcTaskName );
- if( ulStatsAsPercentage > 0UL )
- {
- #ifdef portLU_PRINTF_SPECIFIER_REQUIRED
- {
- sprintf( pcWriteBuffer, "\t%lu\t\t%lu%%\r\n", pxTaskStatusArray[ x ].ulRunTimeCounter, ulStatsAsPercentage );
- }
- #else
- {
- /* sizeof( int ) == sizeof( long ) so a smaller
- printf() library can be used. */
- sprintf( pcWriteBuffer, "\t%u\t\t%u%%\r\n", ( unsigned int ) pxTaskStatusArray[ x ].ulRunTimeCounter, ( unsigned int ) ulStatsAsPercentage );
- }
- #endif
- }
- else
- {
- /* If the percentage is zero here then the task has
- consumed less than 1% of the total run time. */
- #ifdef portLU_PRINTF_SPECIFIER_REQUIRED
- {
- sprintf( pcWriteBuffer, "\t%lu\t\t<1%%\r\n", pxTaskStatusArray[ x ].ulRunTimeCounter );
- }
- #else
- {
- /* sizeof( int ) == sizeof( long ) so a smaller
- printf() library can be used. */
- sprintf( pcWriteBuffer, "\t%u\t\t<1%%\r\n", ( unsigned int ) pxTaskStatusArray[ x ].ulRunTimeCounter );
- }
- #endif
- }
- pcWriteBuffer += strlen( pcWriteBuffer );
- }
- }
- else
- {
- mtCOVERAGE_TEST_MARKER();
- }
- /* Free the array again. NOTE! If configSUPPORT_DYNAMIC_ALLOCATION
- is 0 then vPortFree() will be #defined to nothing. */
- vPortFree( pxTaskStatusArray );
- }
- else
- {
- mtCOVERAGE_TEST_MARKER();
- }
- }
- #endif /* ( ( configGENERATE_RUN_TIME_STATS == 1 ) && ( configUSE_STATS_FORMATTING_FUNCTIONS > 0 ) && ( configSUPPORT_STATIC_ALLOCATION == 1 ) ) */
- /*-----------------------------------------------------------*/
- TickType_t uxTaskResetEventItemValue( void )
- {
- TickType_t uxReturn;
- uxReturn = listGET_LIST_ITEM_VALUE( &( pxCurrentTCB->xEventListItem ) );
- /* Reset the event list item to its normal value - so it can be used with
- queues and semaphores. */
- 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. */
- return uxReturn;
- }
- /*-----------------------------------------------------------*/
- #if ( configUSE_MUTEXES == 1 )
- void *pvTaskIncrementMutexHeldCount( void )
- {
- /* If xSemaphoreCreateMutex() is called before any tasks have been created
- then pxCurrentTCB will be NULL. */
- if( pxCurrentTCB != NULL )
- {
- ( pxCurrentTCB->uxMutexesHeld )++;
- }
- return pxCurrentTCB;
- }
- #endif /* configUSE_MUTEXES */
- /*-----------------------------------------------------------*/
- #if( configUSE_TASK_NOTIFICATIONS == 1 )
- uint32_t ulTaskNotifyTake( BaseType_t xClearCountOnExit, TickType_t xTicksToWait )
- {
- uint32_t ulReturn;
- taskENTER_CRITICAL();
- {
- /* Only block if the notification count is not already non-zero. */
- if( pxCurrentTCB->ulNotifiedValue == 0UL )
- {
- /* Mark this task as waiting for a notification. */
- pxCurrentTCB->ucNotifyState = taskWAITING_NOTIFICATION;
- if( xTicksToWait > ( TickType_t ) 0 )
- {
- prvAddCurrentTaskToDelayedList( xTicksToWait, pdTRUE );
- traceTASK_NOTIFY_TAKE_BLOCK();
- /* All ports are written to allow a yield in a critical
- section (some will yield immediately, others wait until the
- critical section exits) - but it is not something that
- application code should ever do. */
- portYIELD_WITHIN_API();
- }
- else
- {
- mtCOVERAGE_TEST_MARKER();
- }
- }
- else
- {
- mtCOVERAGE_TEST_MARKER();
- }
- }
- taskEXIT_CRITICAL();
- taskENTER_CRITICAL();
- {
- traceTASK_NOTIFY_TAKE();
- ulReturn = pxCurrentTCB->ulNotifiedValue;
- if( ulReturn != 0UL )
- {
- if( xClearCountOnExit != pdFALSE )
- {
- pxCurrentTCB->ulNotifiedValue = 0UL;
- }
- else
- {
- pxCurrentTCB->ulNotifiedValue = ulReturn - ( uint32_t ) 1;
- }
- }
- else
- {
- mtCOVERAGE_TEST_MARKER();
- }
- pxCurrentTCB->ucNotifyState = taskNOT_WAITING_NOTIFICATION;
- }
- taskEXIT_CRITICAL();
- return ulReturn;
- }
- #endif /* configUSE_TASK_NOTIFICATIONS */
- /*-----------------------------------------------------------*/
- #if( configUSE_TASK_NOTIFICATIONS == 1 )
- BaseType_t xTaskNotifyWait( uint32_t ulBitsToClearOnEntry, uint32_t ulBitsToClearOnExit, uint32_t *pulNotificationValue, TickType_t xTicksToWait )
- {
- BaseType_t xReturn;
- taskENTER_CRITICAL();
- {
- /* Only block if a notification is not already pending. */
- if( pxCurrentTCB->ucNotifyState != taskNOTIFICATION_RECEIVED )
- {
- /* Clear bits in the task's notification value as bits may get
- set by the notifying task or interrupt. This can be used to
- clear the value to zero. */
- pxCurrentTCB->ulNotifiedValue &= ~ulBitsToClearOnEntry;
- /* Mark this task as waiting for a notification. */
- pxCurrentTCB->ucNotifyState = taskWAITING_NOTIFICATION;
- if( xTicksToWait > ( TickType_t ) 0 )
- {
- prvAddCurrentTaskToDelayedList( xTicksToWait, pdTRUE );
- traceTASK_NOTIFY_WAIT_BLOCK();
- /* All ports are written to allow a yield in a critical
- section (some will yield immediately, others wait until the
- critical section exits) - but it is not something that
- application code should ever do. */
- portYIELD_WITHIN_API();
- }
- else
- {
- mtCOVERAGE_TEST_MARKER();
- }
- }
- else
- {
- mtCOVERAGE_TEST_MARKER();
- }
- }
- taskEXIT_CRITICAL();
- taskENTER_CRITICAL();
- {
- traceTASK_NOTIFY_WAIT();
- if( pulNotificationValue != NULL )
- {
- /* Output the current notification value, which may or may not
- have changed. */
- *pulNotificationValue = pxCurrentTCB->ulNotifiedValue;
- }
- /* If ucNotifyValue is set then either the task never entered the
- blocked state (because a notification was already pending) or the
- task unblocked because of a notification. Otherwise the task
- unblocked because of a timeout. */
- if( pxCurrentTCB->ucNotifyState != taskNOTIFICATION_RECEIVED )
- {
- /* A notification was not received. */
- xReturn = pdFALSE;
- }
- else
- {
- /* A notification was already pending or a notification was
- received while the task was waiting. */
- pxCurrentTCB->ulNotifiedValue &= ~ulBitsToClearOnExit;
- xReturn = pdTRUE;
- }
- pxCurrentTCB->ucNotifyState = taskNOT_WAITING_NOTIFICATION;
- }
- taskEXIT_CRITICAL();
- return xReturn;
- }
- #endif /* configUSE_TASK_NOTIFICATIONS */
- /*-----------------------------------------------------------*/
- #if( configUSE_TASK_NOTIFICATIONS == 1 )
- BaseType_t xTaskGenericNotify( TaskHandle_t xTaskToNotify, uint32_t ulValue, eNotifyAction eAction, uint32_t *pulPreviousNotificationValue )
- {
- TCB_t * pxTCB;
- BaseType_t xReturn = pdPASS;
- uint8_t ucOriginalNotifyState;
- configASSERT( xTaskToNotify );
- pxTCB = ( TCB_t * ) xTaskToNotify;
- taskENTER_CRITICAL();
- {
- if( pulPreviousNotificationValue != NULL )
- {
- *pulPreviousNotificationValue = pxTCB->ulNotifiedValue;
- }
- ucOriginalNotifyState = pxTCB->ucNotifyState;
- pxTCB->ucNotifyState = taskNOTIFICATION_RECEIVED;
- switch( eAction )
- {
- case eSetBits :
- pxTCB->ulNotifiedValue |= ulValue;
- break;
- case eIncrement :
- ( pxTCB->ulNotifiedValue )++;
- break;
- case eSetValueWithOverwrite :
- pxTCB->ulNotifiedValue = ulValue;
- break;
- case eSetValueWithoutOverwrite :
- if( ucOriginalNotifyState != taskNOTIFICATION_RECEIVED )
- {
- pxTCB->ulNotifiedValue = ulValue;
- }
- else
- {
- /* The value could not be written to the task. */
- xReturn = pdFAIL;
- }
- break;
- case eNoAction:
- /* The task is being notified without its notify value being
- updated. */
- break;
- }
- traceTASK_NOTIFY();
- /* If the task is in the blocked state specifically to wait for a
- notification then unblock it now. */
- if( ucOriginalNotifyState == taskWAITING_NOTIFICATION )
- {
- ( void ) uxListRemove( &( pxTCB->xStateListItem ) );
- prvAddTaskToReadyList( pxTCB );
- /* The task should not have been on an event list. */
- configASSERT( listLIST_ITEM_CONTAINER( &( pxTCB->xEventListItem ) ) == NULL );
- #if( configUSE_TICKLESS_IDLE != 0 )
- {
- /* If a task is blocked waiting for a notification then
- xNextTaskUnblockTime might be set to the blocked task's time
- out time. If the task is unblocked for a reason other than
- a timeout xNextTaskUnblockTime is normally left unchanged,
- because it will automatically get reset to a new value when
- the tick count equals xNextTaskUnblockTime. However if
- tickless idling is used it might be more important to enter
- sleep mode at the earliest possible time - so reset
- xNextTaskUnblockTime here to ensure it is updated at the
- earliest possible time. */
- prvResetNextTaskUnblockTime();
- }
- #endif
- if( pxTCB->uxPriority > pxCurrentTCB->uxPriority )
- {
- /* The notified task has a priority above the currently
- executing task so a yield is required. */
- taskYIELD_IF_USING_PREEMPTION();
- }
- else
- {
- mtCOVERAGE_TEST_MARKER();
- }
- }
- else
- {
- mtCOVERAGE_TEST_MARKER();
- }
- }
- taskEXIT_CRITICAL();
- return xReturn;
- }
- #endif /* configUSE_TASK_NOTIFICATIONS */
- /*-----------------------------------------------------------*/
- #if( configUSE_TASK_NOTIFICATIONS == 1 )
- BaseType_t xTaskGenericNotifyFromISR( TaskHandle_t xTaskToNotify, uint32_t ulValue, eNotifyAction eAction, uint32_t *pulPreviousNotificationValue, BaseType_t *pxHigherPriorityTaskWoken )
- {
- TCB_t * pxTCB;
- uint8_t ucOriginalNotifyState;
- BaseType_t xReturn = pdPASS;
- UBaseType_t uxSavedInterruptStatus;
- configASSERT( xTaskToNotify );
- /* RTOS ports that support interrupt nesting have the concept of a
- maximum system call (or maximum API call) interrupt priority.
- Interrupts that are above the maximum system call priority are keep
- permanently enabled, even when the RTOS kernel is in a critical section,
- but cannot make any calls to FreeRTOS API functions. If configASSERT()
- is defined in FreeRTOSConfig.h then
- portASSERT_IF_INTERRUPT_PRIORITY_INVALID() will result in an assertion
- failure if a FreeRTOS API function is called from an interrupt that has
- been assigned a priority above the configured maximum system call
- priority. Only FreeRTOS functions that end in FromISR can be called
- from interrupts that have been assigned a priority at or (logically)
- below the maximum system call interrupt priority. FreeRTOS maintains a
- separate interrupt safe API to ensure interrupt entry is as fast and as
- simple as possible. More information (albeit Cortex-M specific) is
- provided on the following link:
- http://www.freertos.org/RTOS-Cortex-M3-M4.html */
- portASSERT_IF_INTERRUPT_PRIORITY_INVALID();
- pxTCB = ( TCB_t * ) xTaskToNotify;
- uxSavedInterruptStatus = portSET_INTERRUPT_MASK_FROM_ISR();
- {
- if( pulPreviousNotificationValue != NULL )
- {
- *pulPreviousNotificationValue = pxTCB->ulNotifiedValue;
- }
- ucOriginalNotifyState = pxTCB->ucNotifyState;
- pxTCB->ucNotifyState = taskNOTIFICATION_RECEIVED;
- switch( eAction )
- {
- case eSetBits :
- pxTCB->ulNotifiedValue |= ulValue;
- break;
- case eIncrement :
- ( pxTCB->ulNotifiedValue )++;
- break;
- case eSetValueWithOverwrite :
- pxTCB->ulNotifiedValue = ulValue;
- break;
- case eSetValueWithoutOverwrite :
- if( ucOriginalNotifyState != taskNOTIFICATION_RECEIVED )
- {
- pxTCB->ulNotifiedValue = ulValue;
- }
- else
- {
- /* The value could not be written to the task. */
- xReturn = pdFAIL;
- }
- break;
- case eNoAction :
- /* The task is being notified without its notify value being
- updated. */
- break;
- }
- traceTASK_NOTIFY_FROM_ISR();
- /* If the task is in the blocked state specifically to wait for a
- notification then unblock it now. */
- if( ucOriginalNotifyState == taskWAITING_NOTIFICATION )
- {
- /* The task should not have been on an event list. */
- configASSERT( listLIST_ITEM_CONTAINER( &( pxTCB->xEventListItem ) ) == NULL );
- if( uxSchedulerSuspended == ( UBaseType_t ) pdFALSE )
- {
- ( void ) uxListRemove( &( pxTCB->xStateListItem ) );
- prvAddTaskToReadyList( pxTCB );
- }
- else
- {
- /* The delayed and ready lists cannot be accessed, so hold
- this task pending until the scheduler is resumed. */
- vListInsertEnd( &( xPendingReadyList ), &( pxTCB->xEventListItem ) );
- }
- if( pxTCB->uxPriority > pxCurrentTCB->uxPriority )
- {
- /* The notified task has a priority above the currently
- executing task so a yield is required. */
- if( pxHigherPriorityTaskWoken != NULL )
- {
- *pxHigherPriorityTaskWoken = pdTRUE;
- }
- else
- {
- /* Mark that a yield is pending in case the user is not
- using the "xHigherPriorityTaskWoken" parameter to an ISR
- safe FreeRTOS function. */
- xYieldPending = pdTRUE;
- }
- }
- else
- {
- mtCOVERAGE_TEST_MARKER();
- }
- }
- }
- portCLEAR_INTERRUPT_MASK_FROM_ISR( uxSavedInterruptStatus );
- return xReturn;
- }
- #endif /* configUSE_TASK_NOTIFICATIONS */
- /*-----------------------------------------------------------*/
- #if( configUSE_TASK_NOTIFICATIONS == 1 )
- void vTaskNotifyGiveFromISR( TaskHandle_t xTaskToNotify, BaseType_t *pxHigherPriorityTaskWoken )
- {
- TCB_t * pxTCB;
- uint8_t ucOriginalNotifyState;
- UBaseType_t uxSavedInterruptStatus;
- configASSERT( xTaskToNotify );
- /* RTOS ports that support interrupt nesting have the concept of a
- maximum system call (or maximum API call) interrupt priority.
- Interrupts that are above the maximum system call priority are keep
- permanently enabled, even when the RTOS kernel is in a critical section,
- but cannot make any calls to FreeRTOS API functions. If configASSERT()
- is defined in FreeRTOSConfig.h then
- portASSERT_IF_INTERRUPT_PRIORITY_INVALID() will result in an assertion
- failure if a FreeRTOS API function is called from an interrupt that has
- been assigned a priority above the configured maximum system call
- priority. Only FreeRTOS functions that end in FromISR can be called
- from interrupts that have been assigned a priority at or (logically)
- below the maximum system call interrupt priority. FreeRTOS maintains a
- separate interrupt safe API to ensure interrupt entry is as fast and as
- simple as possible. More information (albeit Cortex-M specific) is
- provided on the following link:
- http://www.freertos.org/RTOS-Cortex-M3-M4.html */
- portASSERT_IF_INTERRUPT_PRIORITY_INVALID();
- pxTCB = ( TCB_t * ) xTaskToNotify;
- uxSavedInterruptStatus = portSET_INTERRUPT_MASK_FROM_ISR();
- {
- ucOriginalNotifyState = pxTCB->ucNotifyState;
- pxTCB->ucNotifyState = taskNOTIFICATION_RECEIVED;
- /* 'Giving' is equivalent to incrementing a count in a counting
- semaphore. */
- ( pxTCB->ulNotifiedValue )++;
- traceTASK_NOTIFY_GIVE_FROM_ISR();
- /* If the task is in the blocked state specifically to wait for a
- notification then unblock it now. */
- if( ucOriginalNotifyState == taskWAITING_NOTIFICATION )
- {
- /* The task should not have been on an event list. */
- configASSERT( listLIST_ITEM_CONTAINER( &( pxTCB->xEventListItem ) ) == NULL );
- if( uxSchedulerSuspended == ( UBaseType_t ) pdFALSE )
- {
- ( void ) uxListRemove( &( pxTCB->xStateListItem ) );
- prvAddTaskToReadyList( pxTCB );
- }
- else
- {
- /* The delayed and ready lists cannot be accessed, so hold
- this task pending until the scheduler is resumed. */
- vListInsertEnd( &( xPendingReadyList ), &( pxTCB->xEventListItem ) );
- }
- if( pxTCB->uxPriority > pxCurrentTCB->uxPriority )
- {
- /* The notified task has a priority above the currently
- executing task so a yield is required. */
- if( pxHigherPriorityTaskWoken != NULL )
- {
- *pxHigherPriorityTaskWoken = pdTRUE;
- }
- else
- {
- /* Mark that a yield is pending in case the user is not
- using the "xHigherPriorityTaskWoken" parameter in an ISR
- safe FreeRTOS function. */
- xYieldPending = pdTRUE;
- }
- }
- else
- {
- mtCOVERAGE_TEST_MARKER();
- }
- }
- }
- portCLEAR_INTERRUPT_MASK_FROM_ISR( uxSavedInterruptStatus );
- }
- #endif /* configUSE_TASK_NOTIFICATIONS */
- /*-----------------------------------------------------------*/
- #if( configUSE_TASK_NOTIFICATIONS == 1 )
- BaseType_t xTaskNotifyStateClear( TaskHandle_t xTask )
- {
- TCB_t *pxTCB;
- BaseType_t xReturn;
- /* If null is passed in here then it is the calling task that is having
- its notification state cleared. */
- pxTCB = prvGetTCBFromHandle( xTask );
- taskENTER_CRITICAL();
- {
- if( pxTCB->ucNotifyState == taskNOTIFICATION_RECEIVED )
- {
- pxTCB->ucNotifyState = taskNOT_WAITING_NOTIFICATION;
- xReturn = pdPASS;
- }
- else
- {
- xReturn = pdFAIL;
- }
- }
- taskEXIT_CRITICAL();
- return xReturn;
- }
- #endif /* configUSE_TASK_NOTIFICATIONS */
- /*-----------------------------------------------------------*/
- static void prvAddCurrentTaskToDelayedList( TickType_t xTicksToWait, const BaseType_t xCanBlockIndefinitely )
- {
- TickType_t xTimeToWake;
- const TickType_t xConstTickCount = xTickCount;
- #if( INCLUDE_xTaskAbortDelay == 1 )
- {
- /* About to enter a delayed list, so ensure the ucDelayAborted flag is
- reset to pdFALSE so it can be detected as having been set to pdTRUE
- when the task leaves the Blocked state. */
- pxCurrentTCB->ucDelayAborted = pdFALSE;
- }
- #endif
- /* Remove the task from the ready list before adding it to the blocked list
- as the same list item is used for both lists. */
- if( uxListRemove( &( pxCurrentTCB->xStateListItem ) ) == ( UBaseType_t ) 0 )
- {
- /* The current task must be in a ready list, so there is no need to
- check, and the port reset macro can be called directly. */
- portRESET_READY_PRIORITY( pxCurrentTCB->uxPriority, uxTopReadyPriority );
- }
- else
- {
- mtCOVERAGE_TEST_MARKER();
- }
- #if ( INCLUDE_vTaskSuspend == 1 )
- {
- if( ( xTicksToWait == portMAX_DELAY ) && ( xCanBlockIndefinitely != pdFALSE ) )
- {
- /* Add the task to the suspended task list instead of a delayed task
- list to ensure it is not woken by a timing event. It will block
- indefinitely. */
- vListInsertEnd( &xSuspendedTaskList, &( pxCurrentTCB->xStateListItem ) );
- }
- else
- {
- /* Calculate the time at which the task should be woken if the event
- does not occur. This may overflow but this doesn't matter, the
- kernel will manage it correctly. */
- xTimeToWake = xConstTickCount + xTicksToWait;
- /* The list item will be inserted in wake time order. */
- listSET_LIST_ITEM_VALUE( &( pxCurrentTCB->xStateListItem ), xTimeToWake );
- if( xTimeToWake < xConstTickCount )
- {
- /* Wake time has overflowed. Place this item in the overflow
- list. */
- vListInsert( pxOverflowDelayedTaskList, &( pxCurrentTCB->xStateListItem ) );
- }
- else
- {
- /* The wake time has not overflowed, so the current block list
- is used. */
- vListInsert( pxDelayedTaskList, &( pxCurrentTCB->xStateListItem ) );
- /* If the task entering the blocked state was placed at the
- head of the list of blocked tasks then xNextTaskUnblockTime
- needs to be updated too. */
- if( xTimeToWake < xNextTaskUnblockTime )
- {
- xNextTaskUnblockTime = xTimeToWake;
- }
- else
- {
- mtCOVERAGE_TEST_MARKER();
- }
- }
- }
- }
- #else /* INCLUDE_vTaskSuspend */
- {
- /* Calculate the time at which the task should be woken if the event
- does not occur. This may overflow but this doesn't matter, the kernel
- will manage it correctly. */
- xTimeToWake = xConstTickCount + xTicksToWait;
- /* The list item will be inserted in wake time order. */
- listSET_LIST_ITEM_VALUE( &( pxCurrentTCB->xStateListItem ), xTimeToWake );
- if( xTimeToWake < xConstTickCount )
- {
- /* Wake time has overflowed. Place this item in the overflow list. */
- vListInsert( pxOverflowDelayedTaskList, &( pxCurrentTCB->xStateListItem ) );
- }
- else
- {
- /* The wake time has not overflowed, so the current block list is used. */
- vListInsert( pxDelayedTaskList, &( pxCurrentTCB->xStateListItem ) );
- /* If the task entering the blocked state was placed at the head of the
- list of blocked tasks then xNextTaskUnblockTime needs to be updated
- too. */
- if( xTimeToWake < xNextTaskUnblockTime )
- {
- xNextTaskUnblockTime = xTimeToWake;
- }
- else
- {
- mtCOVERAGE_TEST_MARKER();
- }
- }
- /* Avoid compiler warning when INCLUDE_vTaskSuspend is not 1. */
- ( void ) xCanBlockIndefinitely;
- }
- #endif /* INCLUDE_vTaskSuspend */
- }
- /* Code below here allows additional code to be inserted into this source file,
- especially where access to file scope functions and data is needed (for example
- when performing module tests). */
- #ifdef FREERTOS_MODULE_TEST
- #include "tasks_test_access_functions.h"
- #endif
- #if( configINCLUDE_FREERTOS_TASK_C_ADDITIONS_H == 1 )
- #include "freertos_tasks_c_additions.h"
- static void freertos_tasks_c_additions_init( void )
- {
- #ifdef FREERTOS_TASKS_C_ADDITIONS_INIT
- FREERTOS_TASKS_C_ADDITIONS_INIT();
- #endif
- }
- #endif
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