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Diffstat (limited to 'libraries/FreeRTOS/utility/tasks.c')
| -rwxr-xr-x | libraries/FreeRTOS/utility/tasks.c | 2522 |
1 files changed, 2522 insertions, 0 deletions
diff --git a/libraries/FreeRTOS/utility/tasks.c b/libraries/FreeRTOS/utility/tasks.c new file mode 100755 index 0000000..d48dd4d --- /dev/null +++ b/libraries/FreeRTOS/utility/tasks.c @@ -0,0 +1,2522 @@ +/* + FreeRTOS V7.0.1 - Copyright (C) 2011 Real Time Engineers Ltd. + + + FreeRTOS supports many tools and architectures. V7.0.0 is sponsored by: + Atollic AB - Atollic provides professional embedded systems development + tools for C/C++ development, code analysis and test automation. + See http://www.atollic.com + + + *************************************************************************** + * * + * FreeRTOS tutorial books are available in pdf and paperback. * + * Complete, revised, and edited pdf reference manuals are also * + * available. * + * * + * Purchasing FreeRTOS documentation will not only help you, by * + * ensuring you get running as quickly as possible and with an * + * in-depth knowledge of how to use FreeRTOS, it will also help * + * the FreeRTOS project to continue with its mission of providing * + * professional grade, cross platform, de facto standard solutions * + * for microcontrollers - completely free of charge! * + * * + * >>> See http://www.FreeRTOS.org/Documentation for details. <<< * + * * + * Thank you for using FreeRTOS, and thank you for your support! * + * * + *************************************************************************** + + + This file is part of the FreeRTOS distribution. + + FreeRTOS is free software; you can redistribute it and/or modify it under + the terms of the GNU General Public License (version 2) as published by the + Free Software Foundation AND MODIFIED BY the FreeRTOS exception. + >>>NOTE<<< The modification to the GPL is included to allow you to + distribute a combined work that includes FreeRTOS without being obliged to + provide the source code for proprietary components outside of the FreeRTOS + kernel. FreeRTOS is distributed in the hope that it will be useful, but + WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY + or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + more details. You should have received a copy of the GNU General Public + License and the FreeRTOS license exception along with FreeRTOS; if not it + can be viewed here: http://www.freertos.org/a00114.html and also obtained + by writing to Richard Barry, contact details for whom are available on the + FreeRTOS WEB site. + + 1 tab == 4 spaces! + + http://www.FreeRTOS.org - Documentation, latest information, license and + contact details. + + http://www.SafeRTOS.com - A version that is certified for use in safety + critical systems. + + http://www.OpenRTOS.com - Commercial support, development, porting, + licensing and training services. +*/ + + +#include <stdio.h> +#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 + +#include "FreeRTOS.h" +#include "task.h" +#include "timers.h" +#include "StackMacros.h" + +#undef MPU_WRAPPERS_INCLUDED_FROM_API_FILE + +/* + * Macro to define the amount of stack available to the idle task. + */ +#define tskIDLE_STACK_SIZE configMINIMAL_STACK_SIZE + +/* + * Task control block. A task control block (TCB) is allocated to each task, + * and stores the context of the task. + */ +typedef struct tskTaskControlBlock +{ + volatile portSTACK_TYPE *pxTopOfStack; /*< Points to the location of the last item placed on the tasks stack. THIS MUST BE THE FIRST MEMBER OF THE 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 STRUCT. */ + #endif + + xListItem xGenericListItem; /*< List item used to place the TCB in ready and blocked queues. */ + xListItem xEventListItem; /*< List item used to place the TCB in event lists. */ + unsigned portBASE_TYPE uxPriority; /*< The priority of the task where 0 is the lowest priority. */ + portSTACK_TYPE *pxStack; /*< Points to the start of the stack. */ + signed char pcTaskName[ configMAX_TASK_NAME_LEN ];/*< Descriptive name given to the task when created. Facilitates debugging only. */ + + #if ( portSTACK_GROWTH > 0 ) + portSTACK_TYPE *pxEndOfStack; /*< Used for stack overflow checking on architectures where the stack grows up from low memory. */ + #endif + + #if ( portCRITICAL_NESTING_IN_TCB == 1 ) + unsigned portBASE_TYPE uxCriticalNesting; + #endif + + #if ( configUSE_TRACE_FACILITY == 1 ) + unsigned portBASE_TYPE uxTCBNumber; /*< This is used for tracing the scheduler and making debugging easier only. */ + #endif + + #if ( configUSE_MUTEXES == 1 ) + unsigned portBASE_TYPE uxBasePriority; /*< The priority last assigned to the task - used by the priority inheritance mechanism. */ + #endif + + #if ( configUSE_APPLICATION_TASK_TAG == 1 ) + pdTASK_HOOK_CODE pxTaskTag; + #endif + + #if ( configGENERATE_RUN_TIME_STATS == 1 ) + unsigned long ulRunTimeCounter; /*< Used for calculating how much CPU time each task is utilising. */ + #endif + +} tskTCB; + + +/* + * Some kernel aware debuggers require data to be viewed to be global, rather + * than file scope. + */ +#ifdef portREMOVE_STATIC_QUALIFIER + #define static +#endif + +/*lint -e956 */ +PRIVILEGED_DATA tskTCB * volatile pxCurrentTCB = NULL; + +/* Lists for ready and blocked tasks. --------------------*/ + +PRIVILEGED_DATA static xList pxReadyTasksLists[ configMAX_PRIORITIES ]; /*< Prioritised ready tasks. */ +PRIVILEGED_DATA static xList xDelayedTaskList1; /*< Delayed tasks. */ +PRIVILEGED_DATA static xList xDelayedTaskList2; /*< Delayed tasks (two lists are used - one for delays that have overflowed the current tick count. */ +PRIVILEGED_DATA static xList * volatile pxDelayedTaskList ; /*< Points to the delayed task list currently being used. */ +PRIVILEGED_DATA static xList * volatile pxOverflowDelayedTaskList; /*< Points to the delayed task list currently being used to hold tasks that have overflowed the current tick count. */ +PRIVILEGED_DATA static xList xPendingReadyList; /*< Tasks that have been readied while the scheduler was suspended. They will be moved to the ready queue when the scheduler is resumed. */ + +#if ( INCLUDE_vTaskDelete == 1 ) + + PRIVILEGED_DATA static volatile xList xTasksWaitingTermination; /*< Tasks that have been deleted - but the their memory not yet freed. */ + PRIVILEGED_DATA static volatile unsigned portBASE_TYPE uxTasksDeleted = ( unsigned portBASE_TYPE ) 0; + +#endif + +#if ( INCLUDE_vTaskSuspend == 1 ) + + PRIVILEGED_DATA static xList xSuspendedTaskList; /*< Tasks that are currently suspended. */ + +#endif + +/* File private variables. --------------------------------*/ +PRIVILEGED_DATA static volatile unsigned portBASE_TYPE uxCurrentNumberOfTasks = ( unsigned portBASE_TYPE ) 0; +PRIVILEGED_DATA static volatile portTickType xTickCount = ( portTickType ) 0; +PRIVILEGED_DATA static unsigned portBASE_TYPE uxTopUsedPriority = tskIDLE_PRIORITY; +PRIVILEGED_DATA static volatile unsigned portBASE_TYPE uxTopReadyPriority = tskIDLE_PRIORITY; +PRIVILEGED_DATA static volatile signed portBASE_TYPE xSchedulerRunning = pdFALSE; +PRIVILEGED_DATA static volatile unsigned portBASE_TYPE uxSchedulerSuspended = ( unsigned portBASE_TYPE ) pdFALSE; +PRIVILEGED_DATA static volatile unsigned portBASE_TYPE uxMissedTicks = ( unsigned portBASE_TYPE ) 0; +PRIVILEGED_DATA static volatile portBASE_TYPE xMissedYield = ( portBASE_TYPE ) pdFALSE; +PRIVILEGED_DATA static volatile portBASE_TYPE xNumOfOverflows = ( portBASE_TYPE ) 0; +PRIVILEGED_DATA static unsigned portBASE_TYPE uxTaskNumber = ( unsigned portBASE_TYPE ) 0; +PRIVILEGED_DATA static portTickType xNextTaskUnblockTime = ( portTickType ) portMAX_DELAY; + +#if ( configGENERATE_RUN_TIME_STATS == 1 ) + + PRIVILEGED_DATA static char pcStatsString[ 50 ] ; + PRIVILEGED_DATA static unsigned long ulTaskSwitchedInTime = 0UL; /*< Holds the value of a timer/counter the last time a task was switched in. */ + static void prvGenerateRunTimeStatsForTasksInList( const signed char *pcWriteBuffer, xList *pxList, unsigned long ulTotalRunTime ) PRIVILEGED_FUNCTION; + +#endif + +/* Debugging and trace facilities private variables and macros. ------------*/ + +/* + * 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 ) + +/* + * Macros used by vListTask to indicate which state a task is in. + */ +#define tskBLOCKED_CHAR ( ( signed char ) 'B' ) +#define tskREADY_CHAR ( ( signed char ) 'R' ) +#define tskDELETED_CHAR ( ( signed char ) 'D' ) +#define tskSUSPENDED_CHAR ( ( signed char ) 'S' ) + +/* + * Macros and private variables used by the trace facility. + */ +#if ( configUSE_TRACE_FACILITY == 1 ) + + #define tskSIZE_OF_EACH_TRACE_LINE ( ( unsigned long ) ( sizeof( unsigned long ) + sizeof( unsigned long ) ) ) + PRIVILEGED_DATA static volatile signed char * volatile pcTraceBuffer; + PRIVILEGED_DATA static signed char *pcTraceBufferStart; + PRIVILEGED_DATA static signed char *pcTraceBufferEnd; + PRIVILEGED_DATA static signed portBASE_TYPE xTracing = pdFALSE; + static unsigned portBASE_TYPE uxPreviousTask = 255U; + PRIVILEGED_DATA static char pcStatusString[ 50 ]; + +#endif + +/*-----------------------------------------------------------*/ + +/* + * Macro that writes a trace of scheduler activity to a buffer. This trace + * shows which task is running when and is very useful as a debugging tool. + * As this macro is called each context switch it is a good idea to undefine + * it if not using the facility. + */ +#if ( configUSE_TRACE_FACILITY == 1 ) + + #define vWriteTraceToBuffer() \ + { \ + if( xTracing ) \ + { \ + if( uxPreviousTask != pxCurrentTCB->uxTCBNumber ) \ + { \ + if( ( pcTraceBuffer + tskSIZE_OF_EACH_TRACE_LINE ) < pcTraceBufferEnd ) \ + { \ + uxPreviousTask = pxCurrentTCB->uxTCBNumber; \ + *( unsigned long * ) pcTraceBuffer = ( unsigned long ) xTickCount; \ + pcTraceBuffer += sizeof( unsigned long ); \ + *( unsigned long * ) pcTraceBuffer = ( unsigned long ) uxPreviousTask; \ + pcTraceBuffer += sizeof( unsigned long ); \ + } \ + else \ + { \ + xTracing = pdFALSE; \ + } \ + } \ + } \ + } + +#else + + #define vWriteTraceToBuffer() + +#endif +/*-----------------------------------------------------------*/ + +/* + * Place the task represented by pxTCB into the appropriate ready queue for + * the task. It is inserted at the end of the list. One quirk of this is + * that if the task being inserted is at the same priority as the currently + * executing task, then it will only be rescheduled after the currently + * executing task has been rescheduled. + */ +#define prvAddTaskToReadyQueue( pxTCB ) \ + if( ( pxTCB )->uxPriority > uxTopReadyPriority ) \ + { \ + uxTopReadyPriority = ( pxTCB )->uxPriority; \ + } \ + vListInsertEnd( ( xList * ) &( pxReadyTasksLists[ ( pxTCB )->uxPriority ] ), &( ( pxTCB )->xGenericListItem ) ) +/*-----------------------------------------------------------*/ + +/* + * Macro that looks at the list of tasks that are currently delayed to see if + * any require waking. + * + * Tasks are stored in the queue in the order of their wake time - meaning + * once one tasks has been found whose timer has not expired we need not look + * any further down the list. + */ +#define prvCheckDelayedTasks() \ +{ \ +portTickType xItemValue; \ + \ + /* Is the tick count greater than or equal to the wake time of the first \ + task referenced from the delayed tasks list? */ \ + if( xTickCount >= 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; \ + 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 should be removed from \ + the Blocked state. */ \ + pxTCB = ( tskTCB * ) listGET_OWNER_OF_HEAD_ENTRY( pxDelayedTaskList ); \ + xItemValue = listGET_LIST_ITEM_VALUE( &( pxTCB->xGenericListItem ) ); \ + \ + if( xTickCount < 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 should be removed from the Blocked state - \ + so record the item value in xNextTaskUnblockTime. */ \ + xNextTaskUnblockTime = xItemValue; \ + break; \ + } \ + \ + /* It is time to remove the item from the Blocked state. */ \ + vListRemove( &( pxTCB->xGenericListItem ) ); \ + \ + /* Is the task waiting on an event also? */ \ + if( pxTCB->xEventListItem.pvContainer ) \ + { \ + vListRemove( &( pxTCB->xEventListItem ) ); \ + } \ + prvAddTaskToReadyQueue( pxTCB ); \ + } \ + } \ + } \ +} +/*-----------------------------------------------------------*/ + +/* + * Several functions take an xTaskHandle 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 ) ? ( tskTCB * ) pxCurrentTCB : ( tskTCB * ) ( pxHandle ) ) + +/* Callback function prototypes. --------------------------*/ +extern void vApplicationStackOverflowHook( xTaskHandle *pxTask, signed char *pcTaskName ); +extern void vApplicationTickHook( void ); + +/* File private functions. --------------------------------*/ + +/* + * Utility to ready a TCB for a given task. Mainly just copies the parameters + * into the TCB structure. + */ +static void prvInitialiseTCBVariables( tskTCB *pxTCB, const signed char * const pcName, unsigned portBASE_TYPE uxPriority, const xMemoryRegion * const xRegions, unsigned short usStackDepth ) PRIVILEGED_FUNCTION; + +/* + * 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 ) || ( INCLUDE_vTaskCleanUpResources == 1 ) ) + + static void prvDeleteTCB( tskTCB *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( portTickType xTimeToWake ) PRIVILEGED_FUNCTION; + +/* + * Allocates memory from the heap for a TCB and associated stack. Checks the + * allocation was successful. + */ +static tskTCB *prvAllocateTCBAndStack( unsigned short usStackDepth, portSTACK_TYPE *puxStackBuffer ) PRIVILEGED_FUNCTION; + +/* + * Called from vTaskList. vListTasks details all the tasks currently under + * control of the scheduler. The tasks may be in one of a number of lists. + * prvListTaskWithinSingleList accepts a list and details the tasks from + * within just that list. + * + * THIS FUNCTION IS INTENDED FOR DEBUGGING ONLY, AND SHOULD NOT BE CALLED FROM + * NORMAL APPLICATION CODE. + */ +#if ( configUSE_TRACE_FACILITY == 1 ) + + static void prvListTaskWithinSingleList( const signed char *pcWriteBuffer, xList *pxList, signed char cStatus ) 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 unsigned short usTaskCheckFreeStackSpace( const unsigned char * pucStackByte ) PRIVILEGED_FUNCTION; + +#endif + + +/*lint +e956 */ + + + +/*----------------------------------------------------------- + * TASK CREATION API documented in task.h + *----------------------------------------------------------*/ + +signed portBASE_TYPE xTaskGenericCreate( pdTASK_CODE pxTaskCode, const signed char * const pcName, unsigned short usStackDepth, void *pvParameters, unsigned portBASE_TYPE uxPriority, xTaskHandle *pxCreatedTask, portSTACK_TYPE *puxStackBuffer, const xMemoryRegion * const xRegions ) +{ +signed portBASE_TYPE xReturn; +tskTCB * pxNewTCB; + + configASSERT( pxTaskCode ); + configASSERT( ( uxPriority < configMAX_PRIORITIES ) ); + + /* Allocate the memory required by the TCB and stack for the new task, + checking that the allocation was successful. */ + pxNewTCB = prvAllocateTCBAndStack( usStackDepth, puxStackBuffer ); + + if( pxNewTCB != NULL ) + { + portSTACK_TYPE *pxTopOfStack; + + #if( portUSING_MPU_WRAPPERS == 1 ) + /* Should the task be created in privileged mode? */ + portBASE_TYPE xRunPrivileged; + if( ( uxPriority & portPRIVILEGE_BIT ) != 0x00 ) + { + xRunPrivileged = pdTRUE; + } + else + { + xRunPrivileged = pdFALSE; + } + uxPriority &= ~portPRIVILEGE_BIT; + #endif /* portUSING_MPU_WRAPPERS == 1 */ + + /* Calculate the top of stack address. This depends on whether the + stack grows from high memory to low (as per the 80x86) or visa versa. + portSTACK_GROWTH is used to make the result positive or negative as + required by the port. */ + #if( portSTACK_GROWTH < 0 ) + { + pxTopOfStack = pxNewTCB->pxStack + ( usStackDepth - ( unsigned short ) 1 ); + pxTopOfStack = ( portSTACK_TYPE * ) ( ( ( unsigned long ) pxTopOfStack ) & ( ( unsigned long ) ~portBYTE_ALIGNMENT_MASK ) ); + + /* Check the alignment of the calculated top of stack is correct. */ + configASSERT( ( ( ( unsigned long ) pxTopOfStack & ( unsigned long ) portBYTE_ALIGNMENT_MASK ) == 0UL ) ); + } + #else + { + pxTopOfStack = pxNewTCB->pxStack; + + /* Check the alignment of the stack buffer is correct. */ + configASSERT( ( ( ( unsigned long ) pxNewTCB->pxStack & ( unsigned long ) portBYTE_ALIGNMENT_MASK ) == 0UL ) ); + + /* If we want to use stack checking on architectures that use + a positive stack growth direction then we also need to store the + other extreme of the stack space. */ + pxNewTCB->pxEndOfStack = pxNewTCB->pxStack + ( usStackDepth - 1 ); + } + #endif + + /* Setup the newly allocated TCB with the initial state of the task. */ + prvInitialiseTCBVariables( pxNewTCB, pcName, uxPriority, xRegions, usStackDepth ); + + /* 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 + { + pxNewTCB->pxTopOfStack = pxPortInitialiseStack( pxTopOfStack, pxTaskCode, pvParameters ); + } + #endif + + /* Check the alignment of the initialised stack. */ + configASSERT( ( ( ( unsigned long ) pxNewTCB->pxTopOfStack & ( unsigned long ) portBYTE_ALIGNMENT_MASK ) == 0UL ) ); + + if( ( void * ) pxCreatedTask != NULL ) + { + /* Pass the TCB out - in an anonymous way. The calling function/ + task can use this as a handle to delete the task later if + required.*/ + *pxCreatedTask = ( xTaskHandle ) pxNewTCB; + } + + /* We are going to manipulate the task queues to add this task to a + ready list, so must make sure no interrupts occur. */ + 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 == ( unsigned portBASE_TYPE ) 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 + { + /* 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 <= uxPriority ) + { + pxCurrentTCB = pxNewTCB; + } + } + } + + /* Remember the top priority to make context switching faster. Use + the priority in pxNewTCB as this has been capped to a valid value. */ + if( pxNewTCB->uxPriority > uxTopUsedPriority ) + { + uxTopUsedPriority = pxNewTCB->uxPriority; + } + + #if ( configUSE_TRACE_FACILITY == 1 ) + { + /* Add a counter into the TCB for tracing only. */ + pxNewTCB->uxTCBNumber = uxTaskNumber; + } + #endif + uxTaskNumber++; + + prvAddTaskToReadyQueue( pxNewTCB ); + + xReturn = pdPASS; + traceTASK_CREATE( pxNewTCB ); + } + taskEXIT_CRITICAL(); + } + else + { + xReturn = errCOULD_NOT_ALLOCATE_REQUIRED_MEMORY; + traceTASK_CREATE_FAILED(); + } + + if( xReturn == pdPASS ) + { + if( xSchedulerRunning != pdFALSE ) + { + /* If the created task is of a higher priority than the current task + then it should run now. */ + if( pxCurrentTCB->uxPriority < uxPriority ) + { + portYIELD_WITHIN_API(); + } + } + } + + return xReturn; +} +/*-----------------------------------------------------------*/ + +#if ( INCLUDE_vTaskDelete == 1 ) + + void vTaskDelete( xTaskHandle pxTaskToDelete ) + { + tskTCB *pxTCB; + + taskENTER_CRITICAL(); + { + /* Ensure a yield is performed if the current task is being + deleted. */ + if( pxTaskToDelete == pxCurrentTCB ) + { + pxTaskToDelete = NULL; + } + + /* If null is passed in here then we are deleting ourselves. */ + pxTCB = prvGetTCBFromHandle( pxTaskToDelete ); + + /* Remove task from the ready list and place in the termination list. + This will stop the task from be scheduled. The idle task will check + the termination list and free up any memory allocated by the + scheduler for the TCB and stack. */ + vListRemove( &( pxTCB->xGenericListItem ) ); + + /* Is the task waiting on an event also? */ + if( pxTCB->xEventListItem.pvContainer ) + { + vListRemove( &( pxTCB->xEventListItem ) ); + } + + vListInsertEnd( ( xList * ) &xTasksWaitingTermination, &( pxTCB->xGenericListItem ) ); + + /* 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. */ + ++uxTasksDeleted; + + /* Increment the uxTaskNumberVariable also so kernel aware debuggers + can detect that the task lists need re-generating. */ + uxTaskNumber++; + + traceTASK_DELETE( pxTCB ); + } + taskEXIT_CRITICAL(); + + /* Force a reschedule if we have just deleted the current task. */ + if( xSchedulerRunning != pdFALSE ) + { + if( ( void * ) pxTaskToDelete == NULL ) + { + portYIELD_WITHIN_API(); + } + } + } + +#endif + + + + + + +/*----------------------------------------------------------- + * TASK CONTROL API documented in task.h + *----------------------------------------------------------*/ + +#if ( INCLUDE_vTaskDelayUntil == 1 ) + + void vTaskDelayUntil( portTickType * const pxPreviousWakeTime, portTickType xTimeIncrement ) + { + portTickType xTimeToWake; + portBASE_TYPE xAlreadyYielded, xShouldDelay = pdFALSE; + + configASSERT( pxPreviousWakeTime ); + configASSERT( ( xTimeIncrement > 0 ) ); + + vTaskSuspendAll(); + { + /* Generate the tick time at which the task wants to wake. */ + xTimeToWake = *pxPreviousWakeTime + xTimeIncrement; + + if( xTickCount < *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 > xTickCount ) ) + { + xShouldDelay = pdTRUE; + } + } + 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 > xTickCount ) ) + { + xShouldDelay = pdTRUE; + } + } + + /* Update the wake time ready for the next call. */ + *pxPreviousWakeTime = xTimeToWake; + + if( xShouldDelay != pdFALSE ) + { + traceTASK_DELAY_UNTIL(); + + /* We must remove ourselves from the ready list before adding + ourselves to the blocked list as the same list item is used for + both lists. */ + vListRemove( ( xListItem * ) &( pxCurrentTCB->xGenericListItem ) ); + prvAddCurrentTaskToDelayedList( xTimeToWake ); + } + } + xAlreadyYielded = xTaskResumeAll(); + + /* Force a reschedule if xTaskResumeAll has not already done so, we may + have put ourselves to sleep. */ + if( !xAlreadyYielded ) + { + portYIELD_WITHIN_API(); + } + } + +#endif +/*-----------------------------------------------------------*/ + +#if ( INCLUDE_vTaskDelay == 1 ) + + void vTaskDelay( portTickType xTicksToDelay ) + { + portTickType xTimeToWake; + signed portBASE_TYPE xAlreadyYielded = pdFALSE; + + /* A delay time of zero just forces a reschedule. */ + if( xTicksToDelay > ( portTickType ) 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. */ + + /* Calculate the time to wake - this may overflow but this is + not a problem. */ + xTimeToWake = xTickCount + xTicksToDelay; + + /* We must remove ourselves from the ready list before adding + ourselves to the blocked list as the same list item is used for + both lists. */ + vListRemove( ( xListItem * ) &( pxCurrentTCB->xGenericListItem ) ); + prvAddCurrentTaskToDelayedList( xTimeToWake ); + } + xAlreadyYielded = xTaskResumeAll(); + } + + /* Force a reschedule if xTaskResumeAll has not already done so, we may + have put ourselves to sleep. */ + if( !xAlreadyYielded ) + { + portYIELD_WITHIN_API(); + } + } + +#endif +/*-----------------------------------------------------------*/ + +#if ( INCLUDE_uxTaskPriorityGet == 1 ) + + unsigned portBASE_TYPE uxTaskPriorityGet( xTaskHandle pxTask ) + { + tskTCB *pxTCB; + unsigned portBASE_TYPE uxReturn; + + taskENTER_CRITICAL(); + { + /* If null is passed in here then we are changing the + priority of the calling function. */ + pxTCB = prvGetTCBFromHandle( pxTask ); + uxReturn = pxTCB->uxPriority; + } + taskEXIT_CRITICAL(); + + return uxReturn; + } + +#endif +/*-----------------------------------------------------------*/ + +#if ( INCLUDE_vTaskPrioritySet == 1 ) + + void vTaskPrioritySet( xTaskHandle pxTask, unsigned portBASE_TYPE uxNewPriority ) + { + tskTCB *pxTCB; + unsigned portBASE_TYPE uxCurrentPriority; + portBASE_TYPE xYieldRequired = pdFALSE; + + configASSERT( ( uxNewPriority < configMAX_PRIORITIES ) ); + + /* Ensure the new priority is valid. */ + if( uxNewPriority >= configMAX_PRIORITIES ) + { + uxNewPriority = configMAX_PRIORITIES - ( unsigned portBASE_TYPE ) 1U; + } + + taskENTER_CRITICAL(); + { + if( pxTask == pxCurrentTCB ) + { + pxTask = NULL; + } + + /* If null is passed in here then we are changing the + priority of the calling function. */ + pxTCB = prvGetTCBFromHandle( pxTask ); + + traceTASK_PRIORITY_SET( pxTask, uxNewPriority ); + + #if ( configUSE_MUTEXES == 1 ) + { + uxCurrentPriority = pxTCB->uxBasePriority; + } + #else + { + uxCurrentPriority = pxTCB->uxPriority; + } + #endif + + if( uxCurrentPriority != uxNewPriority ) + { + /* The priority change may have readied a task of higher + priority than the calling task. */ + if( uxNewPriority > uxCurrentPriority ) + { + if( pxTask != NULL ) + { + /* The priority of another task is being raised. If we + were raising the priority of the currently running task + there would be no need to switch as it must have already + been the highest priority task. */ + xYieldRequired = pdTRUE; + } + } + else if( pxTask == NULL ) + { + /* Setting our own priority down means there may now be another + task of higher priority that is ready to execute. */ + xYieldRequired = pdTRUE; + } + + + + #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; + } + + /* The base priority gets set whatever. */ + pxTCB->uxBasePriority = uxNewPriority; + } + #else + { + pxTCB->uxPriority = uxNewPriority; + } + #endif + + listSET_LIST_ITEM_VALUE( &( pxTCB->xEventListItem ), ( configMAX_PRIORITIES - ( portTickType ) uxNewPriority ) ); + + /* If the task is in the blocked or suspended list we need do + nothing more than change it's priority variable. However, if + the task is in a ready list it needs to be removed and placed + in the queue appropriate to its new priority. */ + if( listIS_CONTAINED_WITHIN( &( pxReadyTasksLists[ uxCurrentPriority ] ), &( pxTCB->xGenericListItem ) ) ) + { + /* 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. */ + vListRemove( &( pxTCB->xGenericListItem ) ); + prvAddTaskToReadyQueue( pxTCB ); + } + + if( xYieldRequired == pdTRUE ) + { + portYIELD_WITHIN_API(); + } + } + } + taskEXIT_CRITICAL(); + } + +#endif +/*-----------------------------------------------------------*/ + +#if ( INCLUDE_vTaskSuspend == 1 ) + + void vTaskSuspend( xTaskHandle pxTaskToSuspend ) + { + tskTCB *pxTCB; + + taskENTER_CRITICAL(); + { + /* Ensure a yield is performed if the current task is being + suspended. */ + if( pxTaskToSuspend == pxCurrentTCB ) + { + pxTaskToSuspend = NULL; + } + + /* If null is passed in here then we are suspending ourselves. */ + pxTCB = prvGetTCBFromHandle( pxTaskToSuspend ); + + traceTASK_SUSPEND( pxTCB ); + + /* Remove task from the ready/delayed list and place in the suspended list. */ + vListRemove( &( pxTCB->xGenericListItem ) ); + + /* Is the task waiting on an event also? */ + if( pxTCB->xEventListItem.pvContainer ) + { + vListRemove( &( pxTCB->xEventListItem ) ); + } + + vListInsertEnd( ( xList * ) &xSuspendedTaskList, &( pxTCB->xGenericListItem ) ); + } + taskEXIT_CRITICAL(); + + if( ( void * ) pxTaskToSuspend == NULL ) + { + if( xSchedulerRunning != pdFALSE ) + { + /* We have just suspended the current task. */ + 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(); + } + } + } + } + +#endif +/*-----------------------------------------------------------*/ + +#if ( INCLUDE_vTaskSuspend == 1 ) + + signed portBASE_TYPE xTaskIsTaskSuspended( xTaskHandle xTask ) + { + portBASE_TYPE xReturn = pdFALSE; + const tskTCB * const pxTCB = ( tskTCB * ) xTask; + + /* It does not make sense to check if the calling task is suspended. */ + configASSERT( xTask ); + + /* Is the task we are attempting to resume actually in the + suspended list? */ + if( listIS_CONTAINED_WITHIN( &xSuspendedTaskList, &( pxTCB->xGenericListItem ) ) != pdFALSE ) + { + /* Has the task already been resumed from within an ISR? */ + if( listIS_CONTAINED_WITHIN( &xPendingReadyList, &( pxTCB->xEventListItem ) ) != pdTRUE ) + { + /* Is it in the suspended list because it is in the + Suspended state? It is possible to be in the suspended + list because it is blocked on a task with no timeout + specified. */ + if( listIS_CONTAINED_WITHIN( NULL, &( pxTCB->xEventListItem ) ) == pdTRUE ) + { + xReturn = pdTRUE; + } + } + } + + return xReturn; + } + +#endif +/*-----------------------------------------------------------*/ + +#if ( INCLUDE_vTaskSuspend == 1 ) + + void vTaskResume( xTaskHandle pxTaskToResume ) + { + tskTCB *pxTCB; + + /* It does not make sense to resume the calling task. */ + configASSERT( pxTaskToResume ); + + /* Remove the task from whichever list it is currently in, and place + it in the ready list. */ + pxTCB = ( tskTCB * ) pxTaskToResume; + + /* The parameter cannot be NULL as it is impossible to resume the + currently executing task. */ + if( ( pxTCB != NULL ) && ( pxTCB != pxCurrentTCB ) ) + { + taskENTER_CRITICAL(); + { + if( xTaskIsTaskSuspended( pxTCB ) == pdTRUE ) + { + traceTASK_RESUME( pxTCB ); + + /* As we are in a critical section we can access the ready + lists even if the scheduler is suspended. */ + vListRemove( &( pxTCB->xGenericListItem ) ); + prvAddTaskToReadyQueue( pxTCB ); + + /* We may have just resumed a higher priority task. */ + 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. */ + portYIELD_WITHIN_API(); + } + } + } + taskEXIT_CRITICAL(); + } + } + +#endif + +/*-----------------------------------------------------------*/ + +#if ( ( INCLUDE_xTaskResumeFromISR == 1 ) && ( INCLUDE_vTaskSuspend == 1 ) ) + + portBASE_TYPE xTaskResumeFromISR( xTaskHandle pxTaskToResume ) + { + portBASE_TYPE xYieldRequired = pdFALSE; + tskTCB *pxTCB; + + configASSERT( pxTaskToResume ); + + pxTCB = ( tskTCB * ) pxTaskToResume; + + if( xTaskIsTaskSuspended( pxTCB ) == pdTRUE ) + { + traceTASK_RESUME_FROM_ISR( pxTCB ); + + if( uxSchedulerSuspended == ( unsigned portBASE_TYPE ) pdFALSE ) + { + xYieldRequired = ( pxTCB->uxPriority >= pxCurrentTCB->uxPriority ); + vListRemove( &( pxTCB->xGenericListItem ) ); + prvAddTaskToReadyQueue( pxTCB ); + } + else + { + /* We cannot access the delayed or ready lists, so will hold this + task pending until the scheduler is resumed, at which point a + yield will be performed if necessary. */ + vListInsertEnd( ( xList * ) &( xPendingReadyList ), &( pxTCB->xEventListItem ) ); + } + } + + return xYieldRequired; + } + +#endif + + + + +/*----------------------------------------------------------- + * PUBLIC SCHEDULER CONTROL documented in task.h + *----------------------------------------------------------*/ + + +void vTaskStartScheduler( void ) +{ +portBASE_TYPE xReturn; + + /* Add the idle task at the lowest priority. */ + xReturn = xTaskCreate( prvIdleTask, ( signed char * ) "IDLE", tskIDLE_STACK_SIZE, ( void * ) NULL, ( tskIDLE_PRIORITY | portPRIVILEGE_BIT ), ( xTaskHandle * ) NULL ); + + #if ( configUSE_TIMERS == 1 ) + { + if( xReturn == pdPASS ) + { + xReturn = xTimerCreateTimerTask(); + } + } + #endif + + if( xReturn == pdPASS ) + { + /* 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. + + STEPPING THROUGH HERE USING A DEBUGGER CAN CAUSE BIG PROBLEMS IF THE + DEBUGGER ALLOWS INTERRUPTS TO BE PROCESSED. */ + portDISABLE_INTERRUPTS(); + + xSchedulerRunning = pdTRUE; + xTickCount = ( portTickType ) 0; + + /* 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. */ + portCONFIGURE_TIMER_FOR_RUN_TIME_STATS(); + + /* Setting up the timer tick is hardware specific and thus in the + portable interface. */ + if( xPortStartScheduler() ) + { + /* 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(). */ + } + } + + /* This line will only be reached if the kernel could not be started. */ + configASSERT( xReturn ); +} +/*-----------------------------------------------------------*/ + +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 + portBASE_TYPE. */ + ++uxSchedulerSuspended; +} +/*----------------------------------------------------------*/ + +signed portBASE_TYPE xTaskResumeAll( void ) +{ +register tskTCB *pxTCB; +signed portBASE_TYPE 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 == ( unsigned portBASE_TYPE ) pdFALSE ) + { + if( uxCurrentNumberOfTasks > ( unsigned portBASE_TYPE ) 0 ) + { + portBASE_TYPE xYieldRequired = pdFALSE; + + /* Move any readied tasks from the pending list into the + appropriate ready list. */ + while( listLIST_IS_EMPTY( ( xList * ) &xPendingReadyList ) == pdFALSE ) + { + pxTCB = ( tskTCB * ) listGET_OWNER_OF_HEAD_ENTRY( ( ( xList * ) &xPendingReadyList ) ); + vListRemove( &( pxTCB->xEventListItem ) ); + vListRemove( &( pxTCB->xGenericListItem ) ); + prvAddTaskToReadyQueue( pxTCB ); + + /* If we have moved a task that has a priority higher than + the current task then we should yield. */ + if( pxTCB->uxPriority >= pxCurrentTCB->uxPriority ) + { + xYieldRequired = pdTRUE; + } + } + + /* 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. */ + if( uxMissedTicks > ( unsigned portBASE_TYPE ) 0 ) + { + while( uxMissedTicks > ( unsigned portBASE_TYPE ) 0 ) + { + vTaskIncrementTick(); + --uxMissedTicks; + } + + /* As we have processed some ticks it is appropriate to yield + to ensure the highest priority task that is ready to run is + the task actually running. */ + #if configUSE_PREEMPTION == 1 + { + xYieldRequired = pdTRUE; + } + #endif + } + + if( ( xYieldRequired == pdTRUE ) || ( xMissedYield == pdTRUE ) ) + { + xAlreadyYielded = pdTRUE; + xMissedYield = pdFALSE; + portYIELD_WITHIN_API(); + } + } + } + } + taskEXIT_CRITICAL(); + + return xAlreadyYielded; +} + + + + + + +/*----------------------------------------------------------- + * PUBLIC TASK UTILITIES documented in task.h + *----------------------------------------------------------*/ + + + +portTickType xTaskGetTickCount( void ) +{ +portTickType xTicks; + + /* Critical section required if running on a 16 bit processor. */ + taskENTER_CRITICAL(); + { + xTicks = xTickCount; + } + taskEXIT_CRITICAL(); + + return xTicks; +} +/*-----------------------------------------------------------*/ + +portTickType xTaskGetTickCountFromISR( void ) +{ +portTickType xReturn; +unsigned portBASE_TYPE uxSavedInterruptStatus; + + uxSavedInterruptStatus = portSET_INTERRUPT_MASK_FROM_ISR(); + xReturn = xTickCount; + portCLEAR_INTERRUPT_MASK_FROM_ISR( uxSavedInterruptStatus ); + + return xReturn; +} +/*-----------------------------------------------------------*/ + +unsigned portBASE_TYPE uxTaskGetNumberOfTasks( void ) +{ + /* A critical section is not required because the variables are of type + portBASE_TYPE. */ + return uxCurrentNumberOfTasks; +} +/*-----------------------------------------------------------*/ + +#if ( configUSE_TRACE_FACILITY == 1 ) + + void vTaskList( signed char *pcWriteBuffer ) + { + unsigned portBASE_TYPE uxQueue; + + /* This is a VERY costly function that should be used for debug only. + It leaves interrupts disabled for a LONG time. */ + + vTaskSuspendAll(); + { + /* Run through all the lists that could potentially contain a TCB and + report the task name, state and stack high water mark. */ + + *pcWriteBuffer = ( signed char ) 0x00; + strcat( ( char * ) pcWriteBuffer, ( const char * ) "\r\n" ); + + uxQueue = uxTopUsedPriority + ( unsigned portBASE_TYPE ) 1U; + + do + { + uxQueue--; + + if( listLIST_IS_EMPTY( &( pxReadyTasksLists[ uxQueue ] ) ) == pdFALSE ) + { + prvListTaskWithinSingleList( pcWriteBuffer, ( xList * ) &( pxReadyTasksLists[ uxQueue ] ), tskREADY_CHAR ); + } + }while( uxQueue > ( unsigned short ) tskIDLE_PRIORITY ); + + if( listLIST_IS_EMPTY( pxDelayedTaskList ) == pdFALSE ) + { + prvListTaskWithinSingleList( pcWriteBuffer, ( xList * ) pxDelayedTaskList, tskBLOCKED_CHAR ); + } + + if( listLIST_IS_EMPTY( pxOverflowDelayedTaskList ) == pdFALSE ) + { + prvListTaskWithinSingleList( pcWriteBuffer, ( xList * ) pxOverflowDelayedTaskList, tskBLOCKED_CHAR ); + } + + #if( INCLUDE_vTaskDelete == 1 ) + { + if( listLIST_IS_EMPTY( &xTasksWaitingTermination ) == pdFALSE ) + { + prvListTaskWithinSingleList( pcWriteBuffer, ( xList * ) &xTasksWaitingTermination, tskDELETED_CHAR ); + } + } + #endif + + #if ( INCLUDE_vTaskSuspend == 1 ) + { + if( listLIST_IS_EMPTY( &xSuspendedTaskList ) == pdFALSE ) + { + prvListTaskWithinSingleList( pcWriteBuffer, ( xList * ) &xSuspendedTaskList, tskSUSPENDED_CHAR ); + } + } + #endif + } + xTaskResumeAll(); + } + +#endif +/*----------------------------------------------------------*/ + +#if ( configGENERATE_RUN_TIME_STATS == 1 ) + + void vTaskGetRunTimeStats( signed char *pcWriteBuffer ) + { + unsigned portBASE_TYPE uxQueue; + unsigned long ulTotalRunTime; + + /* This is a VERY costly function that should be used for debug only. + It leaves interrupts disabled for a LONG time. */ + + vTaskSuspendAll(); + { + #ifdef portALT_GET_RUN_TIME_COUNTER_VALUE + portALT_GET_RUN_TIME_COUNTER_VALUE( ulTotalRunTime ); + #else + ulTotalRunTime = portGET_RUN_TIME_COUNTER_VALUE(); + #endif + + /* Divide ulTotalRunTime by 100 to make the percentage caluclations + simpler in the prvGenerateRunTimeStatsForTasksInList() function. */ + ulTotalRunTime /= 100UL; + + /* Run through all the lists that could potentially contain a TCB, + generating a table of run timer percentages in the provided + buffer. */ + + *pcWriteBuffer = ( signed char ) 0x00; + strcat( ( char * ) pcWriteBuffer, ( const char * ) "\r\n" ); + + uxQueue = uxTopUsedPriority + ( unsigned portBASE_TYPE ) 1U; + + do + { + uxQueue--; + + if( listLIST_IS_EMPTY( &( pxReadyTasksLists[ uxQueue ] ) ) == pdFALSE ) + { + prvGenerateRunTimeStatsForTasksInList( pcWriteBuffer, ( xList * ) &( pxReadyTasksLists[ uxQueue ] ), ulTotalRunTime ); + } + }while( uxQueue > ( unsigned short ) tskIDLE_PRIORITY ); + + if( listLIST_IS_EMPTY( pxDelayedTaskList ) == pdFALSE ) + { + prvGenerateRunTimeStatsForTasksInList( pcWriteBuffer, ( xList * ) pxDelayedTaskList, ulTotalRunTime ); + } + + if( listLIST_IS_EMPTY( pxOverflowDelayedTaskList ) == pdFALSE ) + { + prvGenerateRunTimeStatsForTasksInList( pcWriteBuffer, ( xList * ) pxOverflowDelayedTaskList, ulTotalRunTime ); + } + + #if ( INCLUDE_vTaskDelete == 1 ) + { + if( listLIST_IS_EMPTY( &xTasksWaitingTermination ) == pdFALSE ) + { + prvGenerateRunTimeStatsForTasksInList( pcWriteBuffer, ( xList * ) &xTasksWaitingTermination, ulTotalRunTime ); + } + } + #endif + + #if ( INCLUDE_vTaskSuspend == 1 ) + { + if( listLIST_IS_EMPTY( &xSuspendedTaskList ) == pdFALSE ) + { + prvGenerateRunTimeStatsForTasksInList( pcWriteBuffer, ( xList * ) &xSuspendedTaskList, ulTotalRunTime ); + } + } + #endif + } + xTaskResumeAll(); + } + +#endif +/*----------------------------------------------------------*/ + +#if ( configUSE_TRACE_FACILITY == 1 ) + + void vTaskStartTrace( signed char * pcBuffer, unsigned long ulBufferSize ) + { + configASSERT( pcBuffer ); + configASSERT( ulBufferSize ); + + taskENTER_CRITICAL(); + { + pcTraceBuffer = ( signed char * )pcBuffer; + pcTraceBufferStart = pcBuffer; + pcTraceBufferEnd = pcBuffer + ( ulBufferSize - tskSIZE_OF_EACH_TRACE_LINE ); + xTracing = pdTRUE; + } + taskEXIT_CRITICAL(); + } + +#endif +/*----------------------------------------------------------*/ + +#if ( configUSE_TRACE_FACILITY == 1 ) + + unsigned long ulTaskEndTrace( void ) + { + unsigned long ulBufferLength; + + taskENTER_CRITICAL(); + xTracing = pdFALSE; + taskEXIT_CRITICAL(); + + ulBufferLength = ( unsigned long ) ( pcTraceBuffer - pcTraceBufferStart ); + + return ulBufferLength; + } + +#endif + + + +/*----------------------------------------------------------- + * SCHEDULER INTERNALS AVAILABLE FOR PORTING PURPOSES + * documented in task.h + *----------------------------------------------------------*/ + + +void vTaskIncrementTick( void ) +{ +tskTCB * pxTCB; + + /* 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. */ + if( uxSchedulerSuspended == ( unsigned portBASE_TYPE ) pdFALSE ) + { + ++xTickCount; + if( xTickCount == ( portTickType ) 0 ) + { + xList *pxTemp; + + /* Tick count has overflowed so we need to swap the delay lists. + If there are any items in pxDelayedTaskList here then there is + an error! */ + configASSERT( ( listLIST_IS_EMPTY( pxDelayedTaskList ) ) ); + + pxTemp = pxDelayedTaskList; + pxDelayedTaskList = pxOverflowDelayedTaskList; + pxOverflowDelayedTaskList = pxTemp; + xNumOfOverflows++; + + 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 = ( tskTCB * ) listGET_OWNER_OF_HEAD_ENTRY( pxDelayedTaskList ); + xNextTaskUnblockTime = listGET_LIST_ITEM_VALUE( &( pxTCB->xGenericListItem ) ); + } + } + + /* See if this tick has made a timeout expire. */ + prvCheckDelayedTasks(); + } + else + { + ++uxMissedTicks; + + /* The tick hook gets called at regular intervals, even if the + scheduler is locked. */ + #if ( configUSE_TICK_HOOK == 1 ) + { + vApplicationTickHook(); + } + #endif + } + + #if ( configUSE_TICK_HOOK == 1 ) + { + /* Guard against the tick hook being called when the missed tick + count is being unwound (when the scheduler is being unlocked. */ + if( uxMissedTicks == ( unsigned portBASE_TYPE ) 0U ) + { + vApplicationTickHook(); + } + } + #endif + + traceTASK_INCREMENT_TICK( xTickCount ); +} +/*-----------------------------------------------------------*/ + +#if ( ( INCLUDE_vTaskCleanUpResources == 1 ) && ( INCLUDE_vTaskSuspend == 1 ) ) + + void vTaskCleanUpResources( void ) + { + unsigned short usQueue; + volatile tskTCB *pxTCB; + + usQueue = ( unsigned short ) uxTopUsedPriority + ( unsigned short ) 1; + + /* Remove any TCB's from the ready queues. */ + do + { + usQueue--; + + while( listLIST_IS_EMPTY( &( pxReadyTasksLists[ usQueue ] ) ) == pdFALSE ) + { + listGET_OWNER_OF_NEXT_ENTRY( pxTCB, &( pxReadyTasksLists[ usQueue ] ) ); + vListRemove( ( xListItem * ) &( pxTCB->xGenericListItem ) ); + + prvDeleteTCB( ( tskTCB * ) pxTCB ); + } + }while( usQueue > ( unsigned short ) tskIDLE_PRIORITY ); + + /* Remove any TCB's from the delayed queue. */ + while( listLIST_IS_EMPTY( &xDelayedTaskList1 ) == pdFALSE ) + { + listGET_OWNER_OF_NEXT_ENTRY( pxTCB, &xDelayedTaskList1 ); + vListRemove( ( xListItem * ) &( pxTCB->xGenericListItem ) ); + + prvDeleteTCB( ( tskTCB * ) pxTCB ); + } + + /* Remove any TCB's from the overflow delayed queue. */ + while( listLIST_IS_EMPTY( &xDelayedTaskList2 ) == pdFALSE ) + { + listGET_OWNER_OF_NEXT_ENTRY( pxTCB, &xDelayedTaskList2 ); + vListRemove( ( xListItem * ) &( pxTCB->xGenericListItem ) ); + + prvDeleteTCB( ( tskTCB * ) pxTCB ); + } + + while( listLIST_IS_EMPTY( &xSuspendedTaskList ) == pdFALSE ) + { + listGET_OWNER_OF_NEXT_ENTRY( pxTCB, &xSuspendedTaskList ); + vListRemove( ( xListItem * ) &( pxTCB->xGenericListItem ) ); + + prvDeleteTCB( ( tskTCB * ) pxTCB ); + } + } + +#endif +/*-----------------------------------------------------------*/ + +#if ( configUSE_APPLICATION_TASK_TAG == 1 ) + + void vTaskSetApplicationTaskTag( xTaskHandle xTask, pdTASK_HOOK_CODE pxHookFunction ) + { + tskTCB *xTCB; + + /* If xTask is NULL then we are setting our own task hook. */ + if( xTask == NULL ) + { + xTCB = ( tskTCB * ) pxCurrentTCB; + } + else + { + xTCB = ( tskTCB * ) 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 +/*-----------------------------------------------------------*/ + +#if ( configUSE_APPLICATION_TASK_TAG == 1 ) + + pdTASK_HOOK_CODE xTaskGetApplicationTaskTag( xTaskHandle xTask ) + { + tskTCB *xTCB; + pdTASK_HOOK_CODE xReturn; + + /* If xTask is NULL then we are setting our own task hook. */ + if( xTask == NULL ) + { + xTCB = ( tskTCB * ) pxCurrentTCB; + } + else + { + xTCB = ( tskTCB * ) 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 +/*-----------------------------------------------------------*/ + +#if ( configUSE_APPLICATION_TASK_TAG == 1 ) + + portBASE_TYPE xTaskCallApplicationTaskHook( xTaskHandle xTask, void *pvParameter ) + { + tskTCB *xTCB; + portBASE_TYPE xReturn; + + /* If xTask is NULL then we are calling our own task hook. */ + if( xTask == NULL ) + { + xTCB = ( tskTCB * ) pxCurrentTCB; + } + else + { + xTCB = ( tskTCB * ) xTask; + } + + if( xTCB->pxTaskTag != NULL ) + { + xReturn = xTCB->pxTaskTag( pvParameter ); + } + else + { + xReturn = pdFAIL; + } + + return xReturn; + } + +#endif +/*-----------------------------------------------------------*/ + +void vTaskSwitchContext( void ) +{ + if( uxSchedulerSuspended != ( unsigned portBASE_TYPE ) pdFALSE ) + { + /* The scheduler is currently suspended - do not allow a context + switch. */ + xMissedYield = pdTRUE; + } + else + { + traceTASK_SWITCHED_OUT(); + + #if ( configGENERATE_RUN_TIME_STATS == 1 ) + { + unsigned long ulTempCounter; + + #ifdef portALT_GET_RUN_TIME_COUNTER_VALUE + portALT_GET_RUN_TIME_COUNTER_VALUE( ulTempCounter ); + #else + ulTempCounter = 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. Generally + this will be about 1 hour assuming a 1uS timer increment. */ + pxCurrentTCB->ulRunTimeCounter += ( ulTempCounter - ulTaskSwitchedInTime ); + ulTaskSwitchedInTime = ulTempCounter; + } + #endif + + taskFIRST_CHECK_FOR_STACK_OVERFLOW(); + taskSECOND_CHECK_FOR_STACK_OVERFLOW(); + + /* Find the highest priority queue that contains ready tasks. */ + while( listLIST_IS_EMPTY( &( pxReadyTasksLists[ uxTopReadyPriority ] ) ) ) + { + configASSERT( uxTopReadyPriority ); + --uxTopReadyPriority; + } + + /* listGET_OWNER_OF_NEXT_ENTRY walks 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[ uxTopReadyPriority ] ) ); + + traceTASK_SWITCHED_IN(); + vWriteTraceToBuffer(); + } +} +/*-----------------------------------------------------------*/ + +void vTaskPlaceOnEventList( const xList * const pxEventList, portTickType xTicksToWait ) +{ +portTickType xTimeToWake; + + configASSERT( pxEventList ); + + /* THIS FUNCTION MUST BE CALLED WITH INTERRUPTS DISABLED OR THE + SCHEDULER SUSPENDED. */ + + /* 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. */ + vListInsert( ( xList * ) pxEventList, ( xListItem * ) &( pxCurrentTCB->xEventListItem ) ); + + /* We must remove ourselves from the ready list before adding ourselves + to the blocked list as the same list item is used for both lists. We have + exclusive access to the ready lists as the scheduler is locked. */ + vListRemove( ( xListItem * ) &( pxCurrentTCB->xGenericListItem ) ); + + + #if ( INCLUDE_vTaskSuspend == 1 ) + { + if( xTicksToWait == portMAX_DELAY ) + { + /* Add ourselves to the suspended task list instead of a delayed task + list to ensure we are not woken by a timing event. We will block + indefinitely. */ + vListInsertEnd( ( xList * ) &xSuspendedTaskList, ( xListItem * ) &( pxCurrentTCB->xGenericListItem ) ); + } + 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. */ + xTimeToWake = xTickCount + xTicksToWait; + prvAddCurrentTaskToDelayedList( xTimeToWake ); + } + } + #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. */ + xTimeToWake = xTickCount + xTicksToWait; + prvAddCurrentTaskToDelayedList( xTimeToWake ); + } + #endif +} +/*-----------------------------------------------------------*/ + +#if configUSE_TIMERS == 1 + + void vTaskPlaceOnEventListRestricted( const xList * const pxEventList, portTickType xTicksToWait ) + { + portTickType xTimeToWake; + + 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 from a critical section. */ + + + /* 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( ( xList * ) pxEventList, ( xListItem * ) &( pxCurrentTCB->xEventListItem ) ); + + /* We must remove this task from the ready list before adding it to the + blocked list as the same list item is used for both lists. This + function is called form a critical section. */ + vListRemove( ( xListItem * ) &( pxCurrentTCB->xGenericListItem ) ); + + /* Calculate the time at which the task should be woken if the event does + not occur. This may overflow but this doesn't matter. */ + xTimeToWake = xTickCount + xTicksToWait; + prvAddCurrentTaskToDelayedList( xTimeToWake ); + } + +#endif /* configUSE_TIMERS */ +/*-----------------------------------------------------------*/ + +signed portBASE_TYPE xTaskRemoveFromEventList( const xList * const pxEventList ) +{ +tskTCB *pxUnblockedTCB; +portBASE_TYPE xReturn; + + /* THIS FUNCTION MUST BE CALLED WITH INTERRUPTS DISABLED OR THE + SCHEDULER SUSPENDED. It can also be called from within an ISR. */ + + /* The event list is sorted in priority order, so we can remove the + first in the list, 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 we can always expect exclusive access to the event list here. + + This function assumes that a check has already been made to ensure that + pxEventList is not empty. */ + pxUnblockedTCB = ( tskTCB * ) listGET_OWNER_OF_HEAD_ENTRY( pxEventList ); + configASSERT( pxUnblockedTCB ); + vListRemove( &( pxUnblockedTCB->xEventListItem ) ); + + if( uxSchedulerSuspended == ( unsigned portBASE_TYPE ) pdFALSE ) + { + vListRemove( &( pxUnblockedTCB->xGenericListItem ) ); + prvAddTaskToReadyQueue( pxUnblockedTCB ); + } + else + { + /* We cannot access the delayed or ready lists, so will hold this + task pending until the scheduler is resumed. */ + vListInsertEnd( ( xList * ) &( 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; + } + else + { + xReturn = pdFALSE; + } + + return xReturn; +} +/*-----------------------------------------------------------*/ + +void vTaskSetTimeOutState( xTimeOutType * const pxTimeOut ) +{ + configASSERT( pxTimeOut ); + pxTimeOut->xOverflowCount = xNumOfOverflows; + pxTimeOut->xTimeOnEntering = xTickCount; +} +/*-----------------------------------------------------------*/ + +portBASE_TYPE xTaskCheckForTimeOut( xTimeOutType * const pxTimeOut, portTickType * const pxTicksToWait ) +{ +portBASE_TYPE xReturn; + + configASSERT( pxTimeOut ); + configASSERT( pxTicksToWait ); + + taskENTER_CRITICAL(); + { + #if ( INCLUDE_vTaskSuspend == 1 ) + /* 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. */ + if( *pxTicksToWait == portMAX_DELAY ) + { + xReturn = pdFALSE; + } + else /* We are not blocking indefinitely, perform the checks below. */ + #endif + + if( ( xNumOfOverflows != pxTimeOut->xOverflowCount ) && ( ( portTickType ) xTickCount >= ( portTickType ) pxTimeOut->xTimeOnEntering ) ) + { + /* 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 us again. This + passed since vTaskSetTimeout() was called. */ + xReturn = pdTRUE; + } + else if( ( ( portTickType ) ( ( portTickType ) xTickCount - ( portTickType ) pxTimeOut->xTimeOnEntering ) ) < ( portTickType ) *pxTicksToWait ) + { + /* Not a genuine timeout. Adjust parameters for time remaining. */ + *pxTicksToWait -= ( ( portTickType ) xTickCount - ( portTickType ) pxTimeOut->xTimeOnEntering ); + vTaskSetTimeOutState( pxTimeOut ); + xReturn = pdFALSE; + } + else + { + xReturn = pdTRUE; + } + } + taskEXIT_CRITICAL(); + + return xReturn; +} +/*-----------------------------------------------------------*/ + +void vTaskMissedYield( void ) +{ + xMissedYield = pdTRUE; +} + +/* + * ----------------------------------------------------------- + * 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; + + for( ;; ) + { + /* See if any tasks have been deleted. */ + 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 + + #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 ] ) ) > ( unsigned portBASE_TYPE ) 1 ) + { + taskYIELD(); + } + } + #endif + + #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 + } +} /*lint !e715 pvParameters is not accessed but all task functions require the same prototype. */ + + + + + + + +/*----------------------------------------------------------- + * File private functions documented at the top of the file. + *----------------------------------------------------------*/ + + + +static void prvInitialiseTCBVariables( tskTCB *pxTCB, const signed char * const pcName, unsigned portBASE_TYPE uxPriority, const xMemoryRegion * const xRegions, unsigned short usStackDepth ) +{ + /* Store the function name in the TCB. */ + #if configMAX_TASK_NAME_LEN > 1 + { + /* Don't bring strncpy into the build unnecessarily. */ + strncpy( ( char * ) pxTCB->pcTaskName, ( const char * ) pcName, ( unsigned short ) configMAX_TASK_NAME_LEN ); + } + #endif + pxTCB->pcTaskName[ ( unsigned short ) configMAX_TASK_NAME_LEN - ( unsigned short ) 1 ] = ( signed char ) '\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 >= configMAX_PRIORITIES ) + { + uxPriority = configMAX_PRIORITIES - ( unsigned portBASE_TYPE ) 1U; + } + + pxTCB->uxPriority = uxPriority; + #if ( configUSE_MUTEXES == 1 ) + { + pxTCB->uxBasePriority = uxPriority; + } + #endif + + vListInitialiseItem( &( pxTCB->xGenericListItem ) ); + vListInitialiseItem( &( pxTCB->xEventListItem ) ); + + /* Set the pxTCB as a link back from the xListItem. This is so we can get + back to the containing TCB from a generic item in a list. */ + listSET_LIST_ITEM_OWNER( &( pxTCB->xGenericListItem ), pxTCB ); + + /* Event lists are always in priority order. */ + listSET_LIST_ITEM_VALUE( &( pxTCB->xEventListItem ), configMAX_PRIORITIES - ( portTickType ) uxPriority ); + listSET_LIST_ITEM_OWNER( &( pxTCB->xEventListItem ), pxTCB ); + + #if ( portCRITICAL_NESTING_IN_TCB == 1 ) + { + pxTCB->uxCriticalNesting = ( unsigned portBASE_TYPE ) 0; + } + #endif + + #if ( configUSE_APPLICATION_TASK_TAG == 1 ) + { + pxTCB->pxTaskTag = NULL; + } + #endif + + #if ( configGENERATE_RUN_TIME_STATS == 1 ) + { + pxTCB->ulRunTimeCounter = 0UL; + } + #endif + + #if ( portUSING_MPU_WRAPPERS == 1 ) + { + vPortStoreTaskMPUSettings( &( pxTCB->xMPUSettings ), xRegions, pxTCB->pxStack, usStackDepth ); + } + #else + { + ( void ) xRegions; + ( void ) usStackDepth; + } + #endif +} +/*-----------------------------------------------------------*/ + +#if ( portUSING_MPU_WRAPPERS == 1 ) + + void vTaskAllocateMPURegions( xTaskHandle xTaskToModify, const xMemoryRegion * const xRegions ) + { + tskTCB *pxTCB; + + if( xTaskToModify == pxCurrentTCB ) + { + xTaskToModify = NULL; + } + + /* If null is passed in here then we are deleting ourselves. */ + pxTCB = prvGetTCBFromHandle( xTaskToModify ); + + vPortStoreTaskMPUSettings( &( pxTCB->xMPUSettings ), xRegions, NULL, 0 ); + } + /*-----------------------------------------------------------*/ +#endif + +static void prvInitialiseTaskLists( void ) +{ +unsigned portBASE_TYPE uxPriority; + + for( uxPriority = ( unsigned portBASE_TYPE ) 0U; uxPriority < configMAX_PRIORITIES; uxPriority++ ) + { + vListInitialise( ( xList * ) &( pxReadyTasksLists[ uxPriority ] ) ); + } + + vListInitialise( ( xList * ) &xDelayedTaskList1 ); + vListInitialise( ( xList * ) &xDelayedTaskList2 ); + vListInitialise( ( xList * ) &xPendingReadyList ); + + #if ( INCLUDE_vTaskDelete == 1 ) + { + vListInitialise( ( xList * ) &xTasksWaitingTermination ); + } + #endif + + #if ( INCLUDE_vTaskSuspend == 1 ) + { + vListInitialise( ( xList * ) &xSuspendedTaskList ); + } + #endif + + /* Start with pxDelayedTaskList using list1 and the pxOverflowDelayedTaskList + using list2. */ + pxDelayedTaskList = &xDelayedTaskList1; + pxOverflowDelayedTaskList = &xDelayedTaskList2; +} +/*-----------------------------------------------------------*/ + +static void prvCheckTasksWaitingTermination( void ) +{ + #if ( INCLUDE_vTaskDelete == 1 ) + { + portBASE_TYPE xListIsEmpty; + + /* ucTasksDeleted is used to prevent vTaskSuspendAll() being called + too often in the idle task. */ + if( uxTasksDeleted > ( unsigned portBASE_TYPE ) 0 ) + { + vTaskSuspendAll(); + xListIsEmpty = listLIST_IS_EMPTY( &xTasksWaitingTermination ); + xTaskResumeAll(); + + if( xListIsEmpty == pdFALSE ) + { + tskTCB *pxTCB; + + taskENTER_CRITICAL(); + { + pxTCB = ( tskTCB * ) listGET_OWNER_OF_HEAD_ENTRY( ( ( xList * ) &xTasksWaitingTermination ) ); + vListRemove( &( pxTCB->xGenericListItem ) ); + --uxCurrentNumberOfTasks; + --uxTasksDeleted; + } + taskEXIT_CRITICAL(); + + prvDeleteTCB( pxTCB ); + } + } + } + #endif +} +/*-----------------------------------------------------------*/ + +static void prvAddCurrentTaskToDelayedList( portTickType xTimeToWake ) +{ + /* The list item will be inserted in wake time order. */ + listSET_LIST_ITEM_VALUE( &( pxCurrentTCB->xGenericListItem ), xTimeToWake ); + + if( xTimeToWake < xTickCount ) + { + /* Wake time has overflowed. Place this item in the overflow list. */ + vListInsert( ( xList * ) pxOverflowDelayedTaskList, ( xListItem * ) &( pxCurrentTCB->xGenericListItem ) ); + } + else + { + /* The wake time has not overflowed, so we can use the current block list. */ + vListInsert( ( xList * ) pxDelayedTaskList, ( xListItem * ) &( pxCurrentTCB->xGenericListItem ) ); + + /* 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; + } + } +} +/*-----------------------------------------------------------*/ + +static tskTCB *prvAllocateTCBAndStack( unsigned short usStackDepth, portSTACK_TYPE *puxStackBuffer ) +{ +tskTCB *pxNewTCB; + + /* Allocate space for the TCB. Where the memory comes from depends on + the implementation of the port malloc function. */ + pxNewTCB = ( tskTCB * ) pvPortMalloc( sizeof( tskTCB ) ); + + 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 = ( portSTACK_TYPE * ) pvPortMallocAligned( ( ( ( size_t )usStackDepth ) * sizeof( portSTACK_TYPE ) ), puxStackBuffer ); + + if( pxNewTCB->pxStack == NULL ) + { + /* Could not allocate the stack. Delete the allocated TCB. */ + vPortFree( pxNewTCB ); + pxNewTCB = NULL; + } + else + { + /* Just to help debugging. */ + memset( pxNewTCB->pxStack, tskSTACK_FILL_BYTE, usStackDepth * sizeof( portSTACK_TYPE ) ); + } + } + + return pxNewTCB; +} +/*-----------------------------------------------------------*/ + +#if ( configUSE_TRACE_FACILITY == 1 ) + + static void prvListTaskWithinSingleList( const signed char *pcWriteBuffer, xList *pxList, signed char cStatus ) + { + volatile tskTCB *pxNextTCB, *pxFirstTCB; + unsigned short usStackRemaining; + + /* Write the details of all the TCB's in pxList into the buffer. */ + listGET_OWNER_OF_NEXT_ENTRY( pxFirstTCB, pxList ); + do + { + listGET_OWNER_OF_NEXT_ENTRY( pxNextTCB, pxList ); + #if ( portSTACK_GROWTH > 0 ) + { + usStackRemaining = usTaskCheckFreeStackSpace( ( unsigned char * ) pxNextTCB->pxEndOfStack ); + } + #else + { + usStackRemaining = usTaskCheckFreeStackSpace( ( unsigned char * ) pxNextTCB->pxStack ); + } + #endif + + sprintf( pcStatusString, ( char * ) "%s\t\t%c\t%u\t%u\t%u\r\n", pxNextTCB->pcTaskName, cStatus, ( unsigned int ) pxNextTCB->uxPriority, usStackRemaining, ( unsigned int ) pxNextTCB->uxTCBNumber ); + strcat( ( char * ) pcWriteBuffer, ( char * ) pcStatusString ); + + } while( pxNextTCB != pxFirstTCB ); + } + +#endif +/*-----------------------------------------------------------*/ + +#if ( configGENERATE_RUN_TIME_STATS == 1 ) + + static void prvGenerateRunTimeStatsForTasksInList( const signed char *pcWriteBuffer, xList *pxList, unsigned long ulTotalRunTime ) + { + volatile tskTCB *pxNextTCB, *pxFirstTCB; + unsigned long ulStatsAsPercentage; + + /* Write the run time stats of all the TCB's in pxList into the buffer. */ + listGET_OWNER_OF_NEXT_ENTRY( pxFirstTCB, pxList ); + do + { + /* Get next TCB in from the list. */ + listGET_OWNER_OF_NEXT_ENTRY( pxNextTCB, pxList ); + + /* Divide by zero check. */ + if( ulTotalRunTime > 0UL ) + { + /* Has the task run at all? */ + if( pxNextTCB->ulRunTimeCounter == 0 ) + { + /* The task has used no CPU time at all. */ + sprintf( pcStatsString, ( char * ) "%s\t\t0\t\t0%%\r\n", pxNextTCB->pcTaskName ); + } + else + { + /* What percentage of the total run time has the task used? + This will always be rounded down to the nearest integer. + ulTotalRunTime has already been divided by 100. */ + ulStatsAsPercentage = pxNextTCB->ulRunTimeCounter / ulTotalRunTime; + + if( ulStatsAsPercentage > 0UL ) + { + #ifdef portLU_PRINTF_SPECIFIER_REQUIRED + { + sprintf( pcStatsString, ( char * ) "%s\t\t%lu\t\t%lu%%\r\n", pxNextTCB->pcTaskName, pxNextTCB->ulRunTimeCounter, ulStatsAsPercentage ); + } + #else + { + /* sizeof( int ) == sizeof( long ) so a smaller + printf() library can be used. */ + sprintf( pcStatsString, ( char * ) "%s\t\t%u\t\t%u%%\r\n", pxNextTCB->pcTaskName, ( unsigned int ) pxNextTCB->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( pcStatsString, ( char * ) "%s\t\t%lu\t\t<1%%\r\n", pxNextTCB->pcTaskName, pxNextTCB->ulRunTimeCounter ); + } + #else + { + /* sizeof( int ) == sizeof( long ) so a smaller + printf() library can be used. */ + sprintf( pcStatsString, ( char * ) "%s\t\t%u\t\t<1%%\r\n", pxNextTCB->pcTaskName, ( unsigned int ) pxNextTCB->ulRunTimeCounter ); + } + #endif + } + } + + strcat( ( char * ) pcWriteBuffer, ( char * ) pcStatsString ); + } + + } while( pxNextTCB != pxFirstTCB ); + } + +#endif +/*-----------------------------------------------------------*/ + +#if ( ( configUSE_TRACE_FACILITY == 1 ) || ( INCLUDE_uxTaskGetStackHighWaterMark == 1 ) ) + + static unsigned short usTaskCheckFreeStackSpace( const unsigned char * pucStackByte ) + { + register unsigned short usCount = 0; + + while( *pucStackByte == tskSTACK_FILL_BYTE ) + { + pucStackByte -= portSTACK_GROWTH; + usCount++; + } + + usCount /= sizeof( portSTACK_TYPE ); + + return usCount; + } + +#endif +/*-----------------------------------------------------------*/ + +#if ( INCLUDE_uxTaskGetStackHighWaterMark == 1 ) + + unsigned portBASE_TYPE uxTaskGetStackHighWaterMark( xTaskHandle xTask ) + { + tskTCB *pxTCB; + unsigned char *pcEndOfStack; + unsigned portBASE_TYPE uxReturn; + + pxTCB = prvGetTCBFromHandle( xTask ); + + #if portSTACK_GROWTH < 0 + { + pcEndOfStack = ( unsigned char * ) pxTCB->pxStack; + } + #else + { + pcEndOfStack = ( unsigned char * ) pxTCB->pxEndOfStack; + } + #endif + + uxReturn = ( unsigned portBASE_TYPE ) usTaskCheckFreeStackSpace( pcEndOfStack ); + + return uxReturn; + } + +#endif +/*-----------------------------------------------------------*/ + +#if ( ( INCLUDE_vTaskDelete == 1 ) || ( INCLUDE_vTaskCleanUpResources == 1 ) ) + + static void prvDeleteTCB( tskTCB *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. */ + vPortFreeAligned( pxTCB->pxStack ); + vPortFree( pxTCB ); + } + +#endif + + +/*-----------------------------------------------------------*/ + +#if ( ( INCLUDE_xTaskGetCurrentTaskHandle == 1 ) || ( configUSE_MUTEXES == 1 ) ) + + xTaskHandle xTaskGetCurrentTaskHandle( void ) + { + xTaskHandle 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 + +/*-----------------------------------------------------------*/ + +#if ( ( INCLUDE_xTaskGetSchedulerState == 1 ) || ( configUSE_TIMERS == 1 ) ) + + portBASE_TYPE xTaskGetSchedulerState( void ) + { + portBASE_TYPE xReturn; + + if( xSchedulerRunning == pdFALSE ) + { + xReturn = taskSCHEDULER_NOT_STARTED; + } + else + { + if( uxSchedulerSuspended == ( unsigned portBASE_TYPE ) pdFALSE ) + { + xReturn = taskSCHEDULER_RUNNING; + } + else + { + xReturn = taskSCHEDULER_SUSPENDED; + } + } + + return xReturn; + } + +#endif +/*-----------------------------------------------------------*/ + +#if ( configUSE_MUTEXES == 1 ) + + void vTaskPriorityInherit( xTaskHandle * const pxMutexHolder ) + { + tskTCB * const pxTCB = ( tskTCB * ) pxMutexHolder; + + configASSERT( pxMutexHolder ); + + if( pxTCB->uxPriority < pxCurrentTCB->uxPriority ) + { + /* Adjust the mutex holder state to account for its new priority. */ + listSET_LIST_ITEM_VALUE( &( pxTCB->xEventListItem ), configMAX_PRIORITIES - ( portTickType ) pxCurrentTCB->uxPriority ); + + /* If the task being modified is in the ready state it will need to + be moved in to a new list. */ + if( listIS_CONTAINED_WITHIN( &( pxReadyTasksLists[ pxTCB->uxPriority ] ), &( pxTCB->xGenericListItem ) ) ) + { + vListRemove( &( pxTCB->xGenericListItem ) ); + + /* Inherit the priority before being moved into the new list. */ + pxTCB->uxPriority = pxCurrentTCB->uxPriority; + prvAddTaskToReadyQueue( pxTCB ); + } + else + { + /* Just inherit the priority. */ + pxTCB->uxPriority = pxCurrentTCB->uxPriority; + } + } + } + +#endif +/*-----------------------------------------------------------*/ + +#if ( configUSE_MUTEXES == 1 ) + + void vTaskPriorityDisinherit( xTaskHandle * const pxMutexHolder ) + { + tskTCB * const pxTCB = ( tskTCB * ) pxMutexHolder; + + if( pxMutexHolder != NULL ) + { + if( pxTCB->uxPriority != pxTCB->uxBasePriority ) + { + /* We must be the running task to be able to give the mutex back. + Remove ourselves from the ready list we currently appear in. */ + vListRemove( &( pxTCB->xGenericListItem ) ); + + /* Disinherit the priority before adding ourselves into the new + ready list. */ + pxTCB->uxPriority = pxTCB->uxBasePriority; + listSET_LIST_ITEM_VALUE( &( pxTCB->xEventListItem ), configMAX_PRIORITIES - ( portTickType ) pxTCB->uxPriority ); + prvAddTaskToReadyQueue( pxTCB ); + } + } + } + +#endif +/*-----------------------------------------------------------*/ + +#if ( portCRITICAL_NESTING_IN_TCB == 1 ) + + void vTaskEnterCritical( void ) + { + portDISABLE_INTERRUPTS(); + + if( xSchedulerRunning != pdFALSE ) + { + ( pxCurrentTCB->uxCriticalNesting )++; + } + } + +#endif +/*-----------------------------------------------------------*/ + +#if ( portCRITICAL_NESTING_IN_TCB == 1 ) + +void vTaskExitCritical( void ) +{ + if( xSchedulerRunning != pdFALSE ) + { + if( pxCurrentTCB->uxCriticalNesting > 0 ) + { + ( pxCurrentTCB->uxCriticalNesting )--; + + if( pxCurrentTCB->uxCriticalNesting == 0 ) + { + portENABLE_INTERRUPTS(); + } + } + } +} + +#endif +/*-----------------------------------------------------------*/ + + + + |