2 FreeRTOS V7.0.2 - Copyright (C) 2011 Real Time Engineers Ltd.
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5 ***************************************************************************
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7 * FreeRTOS tutorial books are available in pdf and paperback. *
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8 * Complete, revised, and edited pdf reference manuals are also *
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11 * Purchasing FreeRTOS documentation will not only help you, by *
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12 * ensuring you get running as quickly as possible and with an *
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13 * in-depth knowledge of how to use FreeRTOS, it will also help *
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14 * the FreeRTOS project to continue with its mission of providing *
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15 * professional grade, cross platform, de facto standard solutions *
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16 * for microcontrollers - completely free of charge! *
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18 * >>> See http://www.FreeRTOS.org/Documentation for details. <<< *
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20 * Thank you for using FreeRTOS, and thank you for your support! *
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22 ***************************************************************************
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25 This file is part of the FreeRTOS distribution.
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27 FreeRTOS is free software; you can redistribute it and/or modify it under
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28 the terms of the GNU General Public License (version 2) as published by the
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29 Free Software Foundation AND MODIFIED BY the FreeRTOS exception.
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30 >>>NOTE<<< The modification to the GPL is included to allow you to
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31 distribute a combined work that includes FreeRTOS without being obliged to
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32 provide the source code for proprietary components outside of the FreeRTOS
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33 kernel. FreeRTOS is distributed in the hope that it will be useful, but
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34 WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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35 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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36 more details. You should have received a copy of the GNU General Public
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37 License and the FreeRTOS license exception along with FreeRTOS; if not it
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38 can be viewed here: http://www.freertos.org/a00114.html and also obtained
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39 by writing to Richard Barry, contact details for whom are available on the
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44 http://www.FreeRTOS.org - Documentation, latest information, license and
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47 http://www.SafeRTOS.com - A version that is certified for use in safety
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50 http://www.OpenRTOS.com - Commercial support, development, porting,
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51 licensing and training services.
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59 /* Defining MPU_WRAPPERS_INCLUDED_FROM_API_FILE prevents task.h from redefining
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60 all the API functions to use the MPU wrappers. That should only be done when
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61 task.h is included from an application file. */
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62 #define MPU_WRAPPERS_INCLUDED_FROM_API_FILE
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64 #include "FreeRTOS.h"
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65 #include "os_task.h"
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66 #include "os_timer.h"
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67 #include "os_StackMacros.h"
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69 #undef MPU_WRAPPERS_INCLUDED_FROM_API_FILE
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72 * Macro to define the amount of stack available to the idle task.
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74 #define tskIDLE_STACK_SIZE configMINIMAL_STACK_SIZE
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77 * Task control block. A task control block (TCB) is allocated to each task,
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78 * and stores the context of the task.
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80 typedef struct tskTaskControlBlock
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82 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. */
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84 #if ( portUSING_MPU_WRAPPERS == 1 )
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85 xMPU_SETTINGS xMPUSettings; /*< The MPU settings are defined as part of the port layer. THIS MUST BE THE SECOND MEMBER OF THE STRUCT. */
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88 xListItem xGenericListItem; /*< List item used to place the TCB in ready and blocked queues. */
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89 xListItem xEventListItem; /*< List item used to place the TCB in event lists. */
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90 unsigned portBASE_TYPE uxPriority; /*< The priority of the task where 0 is the lowest priority. */
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91 portSTACK_TYPE *pxStack; /*< Points to the start of the stack. */
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92 signed char pcTaskName[ configMAX_TASK_NAME_LEN ];/*< Descriptive name given to the task when created. Facilitates debugging only. */
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94 #if ( portSTACK_GROWTH > 0 )
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95 portSTACK_TYPE *pxEndOfStack; /*< Used for stack overflow checking on architectures where the stack grows up from low memory. */
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98 #if ( portCRITICAL_NESTING_IN_TCB == 1 )
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99 unsigned portBASE_TYPE uxCriticalNesting;
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102 #if ( configUSE_TRACE_FACILITY == 1 )
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103 unsigned portBASE_TYPE uxTCBNumber; /*< This is used for tracing the scheduler and making debugging easier only. */
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106 #if ( configUSE_MUTEXES == 1 )
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107 unsigned portBASE_TYPE uxBasePriority; /*< The priority last assigned to the task - used by the priority inheritance mechanism. */
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110 #if ( configUSE_APPLICATION_TASK_TAG == 1 )
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111 pdTASK_HOOK_CODE pxTaskTag;
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114 #if ( configGENERATE_RUN_TIME_STATS == 1 )
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115 unsigned long ulRunTimeCounter; /*< Used for calculating how much CPU time each task is utilising. */
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122 * Some kernel aware debuggers require data to be viewed to be global, rather
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125 #ifdef portREMOVE_STATIC_QUALIFIER
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130 PRIVILEGED_DATA tskTCB * volatile pxCurrentTCB = NULL;
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132 /* Lists for ready and blocked tasks. --------------------*/
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134 PRIVILEGED_DATA static xList pxReadyTasksLists[ configMAX_PRIORITIES ]; /*< Prioritised ready tasks. */
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135 PRIVILEGED_DATA static xList xDelayedTaskList1; /*< Delayed tasks. */
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136 PRIVILEGED_DATA static xList xDelayedTaskList2; /*< Delayed tasks (two lists are used - one for delays that have overflowed the current tick count. */
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137 PRIVILEGED_DATA static xList * volatile pxDelayedTaskList ; /*< Points to the delayed task list currently being used. */
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138 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. */
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139 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. */
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141 #if ( INCLUDE_vTaskDelete == 1 )
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143 PRIVILEGED_DATA static xList xTasksWaitingTermination; /*< Tasks that have been deleted - but the their memory not yet freed. */
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144 PRIVILEGED_DATA static volatile unsigned portBASE_TYPE uxTasksDeleted = ( unsigned portBASE_TYPE ) 0U;
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148 #if ( INCLUDE_vTaskSuspend == 1 )
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150 PRIVILEGED_DATA static xList xSuspendedTaskList; /*< Tasks that are currently suspended. */
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154 #if ( INCLUDE_xTaskGetIdleTaskHandle == 1 )
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156 PRIVILEGED_DATA static xTaskHandle xIdleTaskHandle = NULL;
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160 /* File private variables. --------------------------------*/
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161 PRIVILEGED_DATA static volatile unsigned portBASE_TYPE uxCurrentNumberOfTasks = ( unsigned portBASE_TYPE ) 0U;
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162 PRIVILEGED_DATA static volatile portTickType xTickCount = ( portTickType ) 0U;
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163 PRIVILEGED_DATA static unsigned portBASE_TYPE uxTopUsedPriority = tskIDLE_PRIORITY;
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164 PRIVILEGED_DATA static volatile unsigned portBASE_TYPE uxTopReadyPriority = tskIDLE_PRIORITY;
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165 PRIVILEGED_DATA static volatile signed portBASE_TYPE xSchedulerRunning = pdFALSE;
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166 PRIVILEGED_DATA static volatile unsigned portBASE_TYPE uxSchedulerSuspended = ( unsigned portBASE_TYPE ) pdFALSE;
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167 PRIVILEGED_DATA static volatile unsigned portBASE_TYPE uxMissedTicks = ( unsigned portBASE_TYPE ) 0U;
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168 PRIVILEGED_DATA static volatile portBASE_TYPE xMissedYield = ( portBASE_TYPE ) pdFALSE;
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169 PRIVILEGED_DATA static volatile portBASE_TYPE xNumOfOverflows = ( portBASE_TYPE ) 0;
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170 PRIVILEGED_DATA static unsigned portBASE_TYPE uxTaskNumber = ( unsigned portBASE_TYPE ) 0U;
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171 PRIVILEGED_DATA static portTickType xNextTaskUnblockTime = ( portTickType ) portMAX_DELAY;
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173 #if ( configGENERATE_RUN_TIME_STATS == 1 )
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175 PRIVILEGED_DATA static char pcStatsString[ 50 ] ;
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176 PRIVILEGED_DATA static unsigned long ulTaskSwitchedInTime = 0UL; /*< Holds the value of a timer/counter the last time a task was switched in. */
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177 static void prvGenerateRunTimeStatsForTasksInList( const signed char *pcWriteBuffer, xList *pxList, unsigned long ulTotalRunTime ) PRIVILEGED_FUNCTION;
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181 /* Debugging and trace facilities private variables and macros. ------------*/
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184 * The value used to fill the stack of a task when the task is created. This
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185 * is used purely for checking the high water mark for tasks.
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187 #define tskSTACK_FILL_BYTE ( 0xa5U )
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190 * Macros used by vListTask to indicate which state a task is in.
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192 #define tskBLOCKED_CHAR ( ( signed char ) 'B' )
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193 #define tskREADY_CHAR ( ( signed char ) 'R' )
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194 #define tskDELETED_CHAR ( ( signed char ) 'D' )
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195 #define tskSUSPENDED_CHAR ( ( signed char ) 'S' )
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198 * Macros and private variables used by the trace facility.
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200 #if ( configUSE_TRACE_FACILITY == 1 )
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202 #define tskSIZE_OF_EACH_TRACE_LINE ( ( unsigned long ) ( sizeof( unsigned long ) + sizeof( unsigned long ) ) )
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203 PRIVILEGED_DATA static volatile signed char * volatile pcTraceBuffer;
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204 PRIVILEGED_DATA static signed char *pcTraceBufferStart;
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205 PRIVILEGED_DATA static signed char *pcTraceBufferEnd;
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206 PRIVILEGED_DATA static signed portBASE_TYPE xTracing = pdFALSE;
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207 static unsigned portBASE_TYPE uxPreviousTask = 255U;
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208 PRIVILEGED_DATA static char pcStatusString[ 50 ];
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212 /*-----------------------------------------------------------*/
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215 * Macro that writes a trace of scheduler activity to a buffer. This trace
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216 * shows which task is running when and is very useful as a debugging tool.
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217 * As this macro is called each context switch it is a good idea to undefine
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218 * it if not using the facility.
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220 #if ( configUSE_TRACE_FACILITY == 1 )
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222 #define vWriteTraceToBuffer() \
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224 if( xTracing != pdFALSE ) \
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226 if( uxPreviousTask != pxCurrentTCB->uxTCBNumber ) \
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228 if( ( pcTraceBuffer + tskSIZE_OF_EACH_TRACE_LINE ) < pcTraceBufferEnd ) \
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230 uxPreviousTask = pxCurrentTCB->uxTCBNumber; \
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231 *( unsigned long * ) pcTraceBuffer = ( unsigned long ) xTickCount; \
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232 pcTraceBuffer += sizeof( unsigned long ); \
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233 *( unsigned long * ) pcTraceBuffer = ( unsigned long ) uxPreviousTask; \
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234 pcTraceBuffer += sizeof( unsigned long ); \
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238 xTracing = pdFALSE; \
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246 #define vWriteTraceToBuffer()
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249 /*-----------------------------------------------------------*/
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252 * Place the task represented by pxTCB into the appropriate ready queue for
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253 * the task. It is inserted at the end of the list. One quirk of this is
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254 * that if the task being inserted is at the same priority as the currently
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255 * executing task, then it will only be rescheduled after the currently
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256 * executing task has been rescheduled.
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258 #define prvAddTaskToReadyQueue( pxTCB ) \
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259 if( ( pxTCB )->uxPriority > uxTopReadyPriority ) \
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261 uxTopReadyPriority = ( pxTCB )->uxPriority; \
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263 vListInsertEnd( ( xList * ) &( pxReadyTasksLists[ ( pxTCB )->uxPriority ] ), &( ( pxTCB )->xGenericListItem ) )
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264 /*-----------------------------------------------------------*/
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267 * Macro that looks at the list of tasks that are currently delayed to see if
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268 * any require waking.
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270 * Tasks are stored in the queue in the order of their wake time - meaning
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271 * once one tasks has been found whose timer has not expired we need not look
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272 * any further down the list.
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274 #define prvCheckDelayedTasks() \
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276 portTickType xItemValue; \
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278 /* Is the tick count greater than or equal to the wake time of the first \
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279 task referenced from the delayed tasks list? */ \
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280 if( xTickCount >= xNextTaskUnblockTime ) \
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284 if( listLIST_IS_EMPTY( pxDelayedTaskList ) != pdFALSE ) \
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286 /* The delayed list is empty. Set xNextTaskUnblockTime to the \
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287 maximum possible value so it is extremely unlikely that the \
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288 if( xTickCount >= xNextTaskUnblockTime ) test will pass next \
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290 xNextTaskUnblockTime = portMAX_DELAY; \
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295 /* The delayed list is not empty, get the value of the item at \
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296 the head of the delayed list. This is the time at which the \
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297 task at the head of the delayed list should be removed from \
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298 the Blocked state. */ \
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299 pxTCB = ( tskTCB * ) listGET_OWNER_OF_HEAD_ENTRY( pxDelayedTaskList ); \
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300 xItemValue = listGET_LIST_ITEM_VALUE( &( pxTCB->xGenericListItem ) ); \
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302 if( xTickCount < xItemValue ) \
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304 /* It is not time to unblock this item yet, but the item \
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305 value is the time at which the task at the head of the \
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306 blocked list should be removed from the Blocked state - \
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307 so record the item value in xNextTaskUnblockTime. */ \
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308 xNextTaskUnblockTime = xItemValue; \
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312 /* It is time to remove the item from the Blocked state. */ \
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313 vListRemove( &( pxTCB->xGenericListItem ) ); \
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315 /* Is the task waiting on an event also? */ \
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316 if( pxTCB->xEventListItem.pvContainer != NULL ) \
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318 vListRemove( &( pxTCB->xEventListItem ) ); \
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320 prvAddTaskToReadyQueue( pxTCB ); \
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325 /*-----------------------------------------------------------*/
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328 * Several functions take an xTaskHandle parameter that can optionally be NULL,
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329 * where NULL is used to indicate that the handle of the currently executing
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330 * task should be used in place of the parameter. This macro simply checks to
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331 * see if the parameter is NULL and returns a pointer to the appropriate TCB.
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333 #define prvGetTCBFromHandle( pxHandle ) ( ( ( pxHandle ) == NULL ) ? ( tskTCB * ) pxCurrentTCB : ( tskTCB * ) ( pxHandle ) )
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335 /* Callback function prototypes. --------------------------*/
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336 extern void vApplicationStackOverflowHook( xTaskHandle *pxTask, signed char *pcTaskName );
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337 extern void vApplicationTickHook( void );
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339 /* File private functions. --------------------------------*/
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342 * Utility to ready a TCB for a given task. Mainly just copies the parameters
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343 * into the TCB structure.
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345 static void prvInitialiseTCBVariables( tskTCB *pxTCB, const signed char * const pcName, unsigned portBASE_TYPE uxPriority, const xMemoryRegion * const xRegions, unsigned short usStackDepth ) PRIVILEGED_FUNCTION;
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348 * Utility to ready all the lists used by the scheduler. This is called
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349 * automatically upon the creation of the first task.
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351 static void prvInitialiseTaskLists( void ) PRIVILEGED_FUNCTION;
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354 * The idle task, which as all tasks is implemented as a never ending loop.
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355 * The idle task is automatically created and added to the ready lists upon
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356 * creation of the first user task.
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358 * The portTASK_FUNCTION_PROTO() macro is used to allow port/compiler specific
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359 * language extensions. The equivalent prototype for this function is:
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361 * void prvIdleTask( void *pvParameters );
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364 static portTASK_FUNCTION_PROTO( prvIdleTask, pvParameters );
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367 * Utility to free all memory allocated by the scheduler to hold a TCB,
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368 * including the stack pointed to by the TCB.
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370 * This does not free memory allocated by the task itself (i.e. memory
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371 * allocated by calls to pvPortMalloc from within the tasks application code).
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373 #if ( INCLUDE_vTaskDelete == 1 )
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375 static void prvDeleteTCB( tskTCB *pxTCB ) PRIVILEGED_FUNCTION;
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380 * Used only by the idle task. This checks to see if anything has been placed
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381 * in the list of tasks waiting to be deleted. If so the task is cleaned up
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382 * and its TCB deleted.
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384 static void prvCheckTasksWaitingTermination( void ) PRIVILEGED_FUNCTION;
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387 * The currently executing task is entering the Blocked state. Add the task to
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388 * either the current or the overflow delayed task list.
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390 static void prvAddCurrentTaskToDelayedList( portTickType xTimeToWake ) PRIVILEGED_FUNCTION;
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393 * Allocates memory from the heap for a TCB and associated stack. Checks the
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394 * allocation was successful.
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396 static tskTCB *prvAllocateTCBAndStack( unsigned short usStackDepth, portSTACK_TYPE *puxStackBuffer ) PRIVILEGED_FUNCTION;
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399 * Called from vTaskList. vListTasks details all the tasks currently under
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400 * control of the scheduler. The tasks may be in one of a number of lists.
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401 * prvListTaskWithinSingleList accepts a list and details the tasks from
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402 * within just that list.
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404 * THIS FUNCTION IS INTENDED FOR DEBUGGING ONLY, AND SHOULD NOT BE CALLED FROM
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405 * NORMAL APPLICATION CODE.
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407 #if ( configUSE_TRACE_FACILITY == 1 )
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409 static void prvListTaskWithinSingleList( const signed char *pcWriteBuffer, xList *pxList, signed char cStatus ) PRIVILEGED_FUNCTION;
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414 * When a task is created, the stack of the task is filled with a known value.
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415 * This function determines the 'high water mark' of the task stack by
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416 * determining how much of the stack remains at the original preset value.
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418 #if ( ( configUSE_TRACE_FACILITY == 1 ) || ( INCLUDE_uxTaskGetStackHighWaterMark == 1 ) )
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420 static unsigned short usTaskCheckFreeStackSpace( const unsigned char * pucStackByte ) PRIVILEGED_FUNCTION;
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429 /*-----------------------------------------------------------
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430 * TASK CREATION API documented in task.h
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431 *----------------------------------------------------------*/
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433 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 )
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435 signed portBASE_TYPE xReturn;
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438 configASSERT( pxTaskCode );
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439 configASSERT( ( uxPriority < configMAX_PRIORITIES ) );
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441 /* Allocate the memory required by the TCB and stack for the new task,
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442 checking that the allocation was successful. */
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443 pxNewTCB = prvAllocateTCBAndStack( usStackDepth, puxStackBuffer );
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445 if( pxNewTCB != NULL )
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447 portSTACK_TYPE *pxTopOfStack;
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449 #if( portUSING_MPU_WRAPPERS == 1 )
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450 /* Should the task be created in privileged mode? */
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451 portBASE_TYPE xRunPrivileged;
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452 if( ( uxPriority & portPRIVILEGE_BIT ) != 0U )
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454 xRunPrivileged = pdTRUE;
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458 xRunPrivileged = pdFALSE;
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460 uxPriority &= ~portPRIVILEGE_BIT;
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461 #endif /* portUSING_MPU_WRAPPERS == 1 */
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463 /* Calculate the top of stack address. This depends on whether the
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464 stack grows from high memory to low (as per the 80x86) or visa versa.
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465 portSTACK_GROWTH is used to make the result positive or negative as
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466 required by the port. */
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467 #if( portSTACK_GROWTH < 0 )
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469 pxTopOfStack = pxNewTCB->pxStack + ( usStackDepth - ( unsigned short ) 1 );
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470 pxTopOfStack = ( portSTACK_TYPE * ) ( ( ( portPOINTER_SIZE_TYPE ) pxTopOfStack ) & ( ( portPOINTER_SIZE_TYPE ) ~portBYTE_ALIGNMENT_MASK ) );
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472 /* Check the alignment of the calculated top of stack is correct. */
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473 configASSERT( ( ( ( unsigned long ) pxTopOfStack & ( unsigned long ) portBYTE_ALIGNMENT_MASK ) == 0UL ) );
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477 pxTopOfStack = pxNewTCB->pxStack;
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479 /* Check the alignment of the stack buffer is correct. */
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480 configASSERT( ( ( ( unsigned long ) pxNewTCB->pxStack & ( unsigned long ) portBYTE_ALIGNMENT_MASK ) == 0UL ) );
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482 /* If we want to use stack checking on architectures that use
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483 a positive stack growth direction then we also need to store the
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484 other extreme of the stack space. */
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485 pxNewTCB->pxEndOfStack = pxNewTCB->pxStack + ( usStackDepth - 1 );
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489 /* Setup the newly allocated TCB with the initial state of the task. */
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490 prvInitialiseTCBVariables( pxNewTCB, pcName, uxPriority, xRegions, usStackDepth );
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492 /* Initialize the TCB stack to look as if the task was already running,
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493 but had been interrupted by the scheduler. The return address is set
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494 to the start of the task function. Once the stack has been initialised
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495 the top of stack variable is updated. */
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496 #if( portUSING_MPU_WRAPPERS == 1 )
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498 pxNewTCB->pxTopOfStack = pxPortInitialiseStack( pxTopOfStack, pxTaskCode, pvParameters, xRunPrivileged );
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502 pxNewTCB->pxTopOfStack = pxPortInitialiseStack( pxTopOfStack, pxTaskCode, pvParameters );
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506 /* Check the alignment of the initialised stack. */
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507 configASSERT( ( ( ( unsigned long ) pxNewTCB->pxTopOfStack & ( unsigned long ) portBYTE_ALIGNMENT_MASK ) == 0UL ) );
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509 if( ( void * ) pxCreatedTask != NULL )
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511 /* Pass the TCB out - in an anonymous way. The calling function/
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512 task can use this as a handle to delete the task later if
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514 *pxCreatedTask = ( xTaskHandle ) pxNewTCB;
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517 /* We are going to manipulate the task queues to add this task to a
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518 ready list, so must make sure no interrupts occur. */
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519 taskENTER_CRITICAL();
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521 uxCurrentNumberOfTasks++;
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522 if( pxCurrentTCB == NULL )
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524 /* There are no other tasks, or all the other tasks are in
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525 the suspended state - make this the current task. */
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526 pxCurrentTCB = pxNewTCB;
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528 if( uxCurrentNumberOfTasks == ( unsigned portBASE_TYPE ) 1 )
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530 /* This is the first task to be created so do the preliminary
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531 initialisation required. We will not recover if this call
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532 fails, but we will report the failure. */
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533 prvInitialiseTaskLists();
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538 /* If the scheduler is not already running, make this task the
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539 current task if it is the highest priority task to be created
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541 if( xSchedulerRunning == pdFALSE )
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543 if( pxCurrentTCB->uxPriority <= uxPriority )
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545 pxCurrentTCB = pxNewTCB;
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550 /* Remember the top priority to make context switching faster. Use
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551 the priority in pxNewTCB as this has been capped to a valid value. */
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552 if( pxNewTCB->uxPriority > uxTopUsedPriority )
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554 uxTopUsedPriority = pxNewTCB->uxPriority;
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557 #if ( configUSE_TRACE_FACILITY == 1 )
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559 /* Add a counter into the TCB for tracing only. */
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560 pxNewTCB->uxTCBNumber = uxTaskNumber;
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565 prvAddTaskToReadyQueue( pxNewTCB );
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568 traceTASK_CREATE( pxNewTCB );
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570 taskEXIT_CRITICAL();
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574 xReturn = errCOULD_NOT_ALLOCATE_REQUIRED_MEMORY;
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575 traceTASK_CREATE_FAILED();
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578 if( xReturn == pdPASS )
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580 if( xSchedulerRunning != pdFALSE )
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582 /* If the created task is of a higher priority than the current task
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583 then it should run now. */
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584 if( pxCurrentTCB->uxPriority < uxPriority )
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586 portYIELD_WITHIN_API();
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593 /*-----------------------------------------------------------*/
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595 #if ( INCLUDE_vTaskDelete == 1 )
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597 void vTaskDelete( xTaskHandle pxTaskToDelete )
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601 taskENTER_CRITICAL();
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603 /* Ensure a yield is performed if the current task is being
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605 if( pxTaskToDelete == pxCurrentTCB )
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607 pxTaskToDelete = NULL;
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610 /* If null is passed in here then we are deleting ourselves. */
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611 pxTCB = prvGetTCBFromHandle( pxTaskToDelete );
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613 /* Remove task from the ready list and place in the termination list.
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614 This will stop the task from be scheduled. The idle task will check
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615 the termination list and free up any memory allocated by the
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616 scheduler for the TCB and stack. */
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617 vListRemove( &( pxTCB->xGenericListItem ) );
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619 /* Is the task waiting on an event also? */
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620 if( pxTCB->xEventListItem.pvContainer != NULL )
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622 vListRemove( &( pxTCB->xEventListItem ) );
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625 vListInsertEnd( ( xList * ) &xTasksWaitingTermination, &( pxTCB->xGenericListItem ) );
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627 /* Increment the ucTasksDeleted variable so the idle task knows
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628 there is a task that has been deleted and that it should therefore
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629 check the xTasksWaitingTermination list. */
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632 /* Increment the uxTaskNumberVariable also so kernel aware debuggers
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633 can detect that the task lists need re-generating. */
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636 traceTASK_DELETE( pxTCB );
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638 taskEXIT_CRITICAL();
\r
640 /* Force a reschedule if we have just deleted the current task. */
\r
641 if( xSchedulerRunning != pdFALSE )
\r
643 if( ( void * ) pxTaskToDelete == NULL )
\r
645 portYIELD_WITHIN_API();
\r
657 /*-----------------------------------------------------------
\r
658 * TASK CONTROL API documented in task.h
\r
659 *----------------------------------------------------------*/
\r
661 #if ( INCLUDE_vTaskDelayUntil == 1 )
\r
663 void vTaskDelayUntil( portTickType * const pxPreviousWakeTime, portTickType xTimeIncrement )
\r
665 portTickType xTimeToWake;
\r
666 portBASE_TYPE xAlreadyYielded, xShouldDelay = pdFALSE;
\r
668 configASSERT( pxPreviousWakeTime );
\r
669 configASSERT( ( xTimeIncrement > 0U ) );
\r
673 /* Generate the tick time at which the task wants to wake. */
\r
674 xTimeToWake = *pxPreviousWakeTime + xTimeIncrement;
\r
676 if( xTickCount < *pxPreviousWakeTime )
\r
678 /* The tick count has overflowed since this function was
\r
679 lasted called. In this case the only time we should ever
\r
680 actually delay is if the wake time has also overflowed,
\r
681 and the wake time is greater than the tick time. When this
\r
682 is the case it is as if neither time had overflowed. */
\r
683 if( ( xTimeToWake < *pxPreviousWakeTime ) && ( xTimeToWake > xTickCount ) )
\r
685 xShouldDelay = pdTRUE;
\r
690 /* The tick time has not overflowed. In this case we will
\r
691 delay if either the wake time has overflowed, and/or the
\r
692 tick time is less than the wake time. */
\r
693 if( ( xTimeToWake < *pxPreviousWakeTime ) || ( xTimeToWake > xTickCount ) )
\r
695 xShouldDelay = pdTRUE;
\r
699 /* Update the wake time ready for the next call. */
\r
700 *pxPreviousWakeTime = xTimeToWake;
\r
702 if( xShouldDelay != pdFALSE )
\r
704 traceTASK_DELAY_UNTIL();
\r
706 /* We must remove ourselves from the ready list before adding
\r
707 ourselves to the blocked list as the same list item is used for
\r
709 vListRemove( ( xListItem * ) &( pxCurrentTCB->xGenericListItem ) );
\r
710 prvAddCurrentTaskToDelayedList( xTimeToWake );
\r
713 xAlreadyYielded = xTaskResumeAll();
\r
715 /* Force a reschedule if xTaskResumeAll has not already done so, we may
\r
716 have put ourselves to sleep. */
\r
717 if( xAlreadyYielded == pdFALSE )
\r
719 portYIELD_WITHIN_API();
\r
724 /*-----------------------------------------------------------*/
\r
726 #if ( INCLUDE_vTaskDelay == 1 )
\r
728 void vTaskDelay( portTickType xTicksToDelay )
\r
730 portTickType xTimeToWake;
\r
731 signed portBASE_TYPE xAlreadyYielded = pdFALSE;
\r
733 /* A delay time of zero just forces a reschedule. */
\r
734 if( xTicksToDelay > ( portTickType ) 0U )
\r
740 /* A task that is removed from the event list while the
\r
741 scheduler is suspended will not get placed in the ready
\r
742 list or removed from the blocked list until the scheduler
\r
745 This task cannot be in an event list as it is the currently
\r
748 /* Calculate the time to wake - this may overflow but this is
\r
750 xTimeToWake = xTickCount + xTicksToDelay;
\r
752 /* We must remove ourselves from the ready list before adding
\r
753 ourselves to the blocked list as the same list item is used for
\r
755 vListRemove( ( xListItem * ) &( pxCurrentTCB->xGenericListItem ) );
\r
756 prvAddCurrentTaskToDelayedList( xTimeToWake );
\r
758 xAlreadyYielded = xTaskResumeAll();
\r
761 /* Force a reschedule if xTaskResumeAll has not already done so, we may
\r
762 have put ourselves to sleep. */
\r
763 if( xAlreadyYielded == pdFALSE )
\r
765 portYIELD_WITHIN_API();
\r
770 /*-----------------------------------------------------------*/
\r
772 #if ( INCLUDE_uxTaskPriorityGet == 1 )
\r
774 unsigned portBASE_TYPE uxTaskPriorityGet( xTaskHandle pxTask )
\r
777 unsigned portBASE_TYPE uxReturn;
\r
779 taskENTER_CRITICAL();
\r
781 /* If null is passed in here then we are changing the
\r
782 priority of the calling function. */
\r
783 pxTCB = prvGetTCBFromHandle( pxTask );
\r
784 uxReturn = pxTCB->uxPriority;
\r
786 taskEXIT_CRITICAL();
\r
792 /*-----------------------------------------------------------*/
\r
794 #if ( INCLUDE_vTaskPrioritySet == 1 )
\r
796 void vTaskPrioritySet( xTaskHandle pxTask, unsigned portBASE_TYPE uxNewPriority )
\r
799 unsigned portBASE_TYPE uxCurrentPriority;
\r
800 portBASE_TYPE xYieldRequired = pdFALSE;
\r
802 configASSERT( ( uxNewPriority < configMAX_PRIORITIES ) );
\r
804 /* Ensure the new priority is valid. */
\r
805 if( uxNewPriority >= configMAX_PRIORITIES )
\r
807 uxNewPriority = configMAX_PRIORITIES - ( unsigned portBASE_TYPE ) 1U;
\r
810 taskENTER_CRITICAL();
\r
812 if( pxTask == pxCurrentTCB )
\r
817 /* If null is passed in here then we are changing the
\r
818 priority of the calling function. */
\r
819 pxTCB = prvGetTCBFromHandle( pxTask );
\r
821 traceTASK_PRIORITY_SET( pxTask, uxNewPriority );
\r
823 #if ( configUSE_MUTEXES == 1 )
\r
825 uxCurrentPriority = pxTCB->uxBasePriority;
\r
829 uxCurrentPriority = pxTCB->uxPriority;
\r
833 if( uxCurrentPriority != uxNewPriority )
\r
835 /* The priority change may have readied a task of higher
\r
836 priority than the calling task. */
\r
837 if( uxNewPriority > uxCurrentPriority )
\r
839 if( pxTask != NULL )
\r
841 /* The priority of another task is being raised. If we
\r
842 were raising the priority of the currently running task
\r
843 there would be no need to switch as it must have already
\r
844 been the highest priority task. */
\r
845 xYieldRequired = pdTRUE;
\r
848 else if( pxTask == NULL )
\r
850 /* Setting our own priority down means there may now be another
\r
851 task of higher priority that is ready to execute. */
\r
852 xYieldRequired = pdTRUE;
\r
857 #if ( configUSE_MUTEXES == 1 )
\r
859 /* Only change the priority being used if the task is not
\r
860 currently using an inherited priority. */
\r
861 if( pxTCB->uxBasePriority == pxTCB->uxPriority )
\r
863 pxTCB->uxPriority = uxNewPriority;
\r
866 /* The base priority gets set whatever. */
\r
867 pxTCB->uxBasePriority = uxNewPriority;
\r
871 pxTCB->uxPriority = uxNewPriority;
\r
875 listSET_LIST_ITEM_VALUE( &( pxTCB->xEventListItem ), ( configMAX_PRIORITIES - ( portTickType ) uxNewPriority ) );
\r
877 /* If the task is in the blocked or suspended list we need do
\r
878 nothing more than change it's priority variable. However, if
\r
879 the task is in a ready list it needs to be removed and placed
\r
880 in the queue appropriate to its new priority. */
\r
881 if( listIS_CONTAINED_WITHIN( &( pxReadyTasksLists[ uxCurrentPriority ] ), &( pxTCB->xGenericListItem ) ) )
\r
883 /* The task is currently in its ready list - remove before adding
\r
884 it to it's new ready list. As we are in a critical section we
\r
885 can do this even if the scheduler is suspended. */
\r
886 vListRemove( &( pxTCB->xGenericListItem ) );
\r
887 prvAddTaskToReadyQueue( pxTCB );
\r
890 if( xYieldRequired == pdTRUE )
\r
892 portYIELD_WITHIN_API();
\r
896 taskEXIT_CRITICAL();
\r
900 /*-----------------------------------------------------------*/
\r
902 #if ( INCLUDE_vTaskSuspend == 1 )
\r
904 void vTaskSuspend( xTaskHandle pxTaskToSuspend )
\r
908 taskENTER_CRITICAL();
\r
910 /* Ensure a yield is performed if the current task is being
\r
912 if( pxTaskToSuspend == pxCurrentTCB )
\r
914 pxTaskToSuspend = NULL;
\r
917 /* If null is passed in here then we are suspending ourselves. */
\r
918 pxTCB = prvGetTCBFromHandle( pxTaskToSuspend );
\r
920 traceTASK_SUSPEND( pxTCB );
\r
922 /* Remove task from the ready/delayed list and place in the suspended list. */
\r
923 vListRemove( &( pxTCB->xGenericListItem ) );
\r
925 /* Is the task waiting on an event also? */
\r
926 if( pxTCB->xEventListItem.pvContainer != NULL )
\r
928 vListRemove( &( pxTCB->xEventListItem ) );
\r
931 vListInsertEnd( ( xList * ) &xSuspendedTaskList, &( pxTCB->xGenericListItem ) );
\r
933 taskEXIT_CRITICAL();
\r
935 if( ( void * ) pxTaskToSuspend == NULL )
\r
937 if( xSchedulerRunning != pdFALSE )
\r
939 /* We have just suspended the current task. */
\r
940 portYIELD_WITHIN_API();
\r
944 /* The scheduler is not running, but the task that was pointed
\r
945 to by pxCurrentTCB has just been suspended and pxCurrentTCB
\r
946 must be adjusted to point to a different task. */
\r
947 if( listCURRENT_LIST_LENGTH( &xSuspendedTaskList ) == uxCurrentNumberOfTasks )
\r
949 /* No other tasks are ready, so set pxCurrentTCB back to
\r
950 NULL so when the next task is created pxCurrentTCB will
\r
951 be set to point to it no matter what its relative priority
\r
953 pxCurrentTCB = NULL;
\r
957 vTaskSwitchContext();
\r
964 /*-----------------------------------------------------------*/
\r
966 #if ( INCLUDE_vTaskSuspend == 1 )
\r
968 signed portBASE_TYPE xTaskIsTaskSuspended( xTaskHandle xTask )
\r
970 portBASE_TYPE xReturn = pdFALSE;
\r
971 const tskTCB * const pxTCB = ( tskTCB * ) xTask;
\r
973 /* It does not make sense to check if the calling task is suspended. */
\r
974 configASSERT( xTask );
\r
976 /* Is the task we are attempting to resume actually in the
\r
978 if( listIS_CONTAINED_WITHIN( &xSuspendedTaskList, &( pxTCB->xGenericListItem ) ) != pdFALSE )
\r
980 /* Has the task already been resumed from within an ISR? */
\r
981 if( listIS_CONTAINED_WITHIN( &xPendingReadyList, &( pxTCB->xEventListItem ) ) != pdTRUE )
\r
983 /* Is it in the suspended list because it is in the
\r
984 Suspended state? It is possible to be in the suspended
\r
985 list because it is blocked on a task with no timeout
\r
987 if( listIS_CONTAINED_WITHIN( NULL, &( pxTCB->xEventListItem ) ) == pdTRUE )
\r
998 /*-----------------------------------------------------------*/
\r
1000 #if ( INCLUDE_vTaskSuspend == 1 )
\r
1002 void vTaskResume( xTaskHandle pxTaskToResume )
\r
1006 /* It does not make sense to resume the calling task. */
\r
1007 configASSERT( pxTaskToResume );
\r
1009 /* Remove the task from whichever list it is currently in, and place
\r
1010 it in the ready list. */
\r
1011 pxTCB = ( tskTCB * ) pxTaskToResume;
\r
1013 /* The parameter cannot be NULL as it is impossible to resume the
\r
1014 currently executing task. */
\r
1015 if( ( pxTCB != NULL ) && ( pxTCB != pxCurrentTCB ) )
\r
1017 taskENTER_CRITICAL();
\r
1019 if( xTaskIsTaskSuspended( pxTCB ) == pdTRUE )
\r
1021 traceTASK_RESUME( pxTCB );
\r
1023 /* As we are in a critical section we can access the ready
\r
1024 lists even if the scheduler is suspended. */
\r
1025 vListRemove( &( pxTCB->xGenericListItem ) );
\r
1026 prvAddTaskToReadyQueue( pxTCB );
\r
1028 /* We may have just resumed a higher priority task. */
\r
1029 if( pxTCB->uxPriority >= pxCurrentTCB->uxPriority )
\r
1031 /* This yield may not cause the task just resumed to run, but
\r
1032 will leave the lists in the correct state for the next yield. */
\r
1033 portYIELD_WITHIN_API();
\r
1037 taskEXIT_CRITICAL();
\r
1043 /*-----------------------------------------------------------*/
\r
1045 #if ( ( INCLUDE_xTaskResumeFromISR == 1 ) && ( INCLUDE_vTaskSuspend == 1 ) )
\r
1047 portBASE_TYPE xTaskResumeFromISR( xTaskHandle pxTaskToResume )
\r
1049 portBASE_TYPE xYieldRequired = pdFALSE;
\r
1052 configASSERT( pxTaskToResume );
\r
1054 pxTCB = ( tskTCB * ) pxTaskToResume;
\r
1056 if( xTaskIsTaskSuspended( pxTCB ) == pdTRUE )
\r
1058 traceTASK_RESUME_FROM_ISR( pxTCB );
\r
1060 if( uxSchedulerSuspended == ( unsigned portBASE_TYPE ) pdFALSE )
\r
1062 xYieldRequired = ( pxTCB->uxPriority >= pxCurrentTCB->uxPriority );
\r
1063 vListRemove( &( pxTCB->xGenericListItem ) );
\r
1064 prvAddTaskToReadyQueue( pxTCB );
\r
1068 /* We cannot access the delayed or ready lists, so will hold this
\r
1069 task pending until the scheduler is resumed, at which point a
\r
1070 yield will be performed if necessary. */
\r
1071 vListInsertEnd( ( xList * ) &( xPendingReadyList ), &( pxTCB->xEventListItem ) );
\r
1075 return xYieldRequired;
\r
1083 /*-----------------------------------------------------------
\r
1084 * PUBLIC SCHEDULER CONTROL documented in task.h
\r
1085 *----------------------------------------------------------*/
\r
1088 void vTaskStartScheduler( void )
\r
1090 portBASE_TYPE xReturn;
\r
1092 /* Add the idle task at the lowest priority. */
\r
1093 #if ( INCLUDE_xTaskGetIdleTaskHandle == 1 )
\r
1095 /* Create the idle task, storing its handle in xIdleTaskHandle so it can
\r
1096 be returned by the xTaskGetIdleTaskHandle() function. */
\r
1097 xReturn = xTaskCreate( prvIdleTask, ( signed char * ) "IDLE", tskIDLE_STACK_SIZE, ( void * ) NULL, ( tskIDLE_PRIORITY | portPRIVILEGE_BIT ), &xIdleTaskHandle );
\r
1101 /* Create the idle task without storing its handle. */
\r
1102 xReturn = xTaskCreate( prvIdleTask, ( signed char * ) "IDLE", tskIDLE_STACK_SIZE, ( void * ) NULL, ( tskIDLE_PRIORITY | portPRIVILEGE_BIT ), NULL );
\r
1106 #if ( configUSE_TIMERS == 1 )
\r
1108 if( xReturn == pdPASS )
\r
1110 xReturn = xTimerCreateTimerTask();
\r
1115 if( xReturn == pdPASS )
\r
1117 /* Interrupts are turned off here, to ensure a tick does not occur
\r
1118 before or during the call to xPortStartScheduler(). The stacks of
\r
1119 the created tasks contain a status word with interrupts switched on
\r
1120 so interrupts will automatically get re-enabled when the first task
\r
1123 STEPPING THROUGH HERE USING A DEBUGGER CAN CAUSE BIG PROBLEMS IF THE
\r
1124 DEBUGGER ALLOWS INTERRUPTS TO BE PROCESSED. */
\r
1125 portDISABLE_INTERRUPTS();
\r
1127 xSchedulerRunning = pdTRUE;
\r
1128 xTickCount = ( portTickType ) 0U;
\r
1130 /* If configGENERATE_RUN_TIME_STATS is defined then the following
\r
1131 macro must be defined to configure the timer/counter used to generate
\r
1132 the run time counter time base. */
\r
1133 portCONFIGURE_TIMER_FOR_RUN_TIME_STATS();
\r
1135 /* Setting up the timer tick is hardware specific and thus in the
\r
1136 portable interface. */
\r
1137 if( xPortStartScheduler() != pdFALSE )
\r
1139 /* Should not reach here as if the scheduler is running the
\r
1140 function will not return. */
\r
1144 /* Should only reach here if a task calls xTaskEndScheduler(). */
\r
1148 /* This line will only be reached if the kernel could not be started. */
\r
1149 configASSERT( xReturn );
\r
1151 /*-----------------------------------------------------------*/
\r
1153 void vTaskEndScheduler( void )
\r
1155 /* Stop the scheduler interrupts and call the portable scheduler end
\r
1156 routine so the original ISRs can be restored if necessary. The port
\r
1157 layer must ensure interrupts enable bit is left in the correct state. */
\r
1158 portDISABLE_INTERRUPTS();
\r
1159 xSchedulerRunning = pdFALSE;
\r
1160 vPortEndScheduler();
\r
1162 /*----------------------------------------------------------*/
\r
1164 void vTaskSuspendAll( void )
\r
1166 /* A critical section is not required as the variable is of type
\r
1168 ++uxSchedulerSuspended;
\r
1170 /*----------------------------------------------------------*/
\r
1172 signed portBASE_TYPE xTaskResumeAll( void )
\r
1174 register tskTCB *pxTCB;
\r
1175 signed portBASE_TYPE xAlreadyYielded = pdFALSE;
\r
1177 /* If uxSchedulerSuspended is zero then this function does not match a
\r
1178 previous call to vTaskSuspendAll(). */
\r
1179 configASSERT( uxSchedulerSuspended );
\r
1181 /* It is possible that an ISR caused a task to be removed from an event
\r
1182 list while the scheduler was suspended. If this was the case then the
\r
1183 removed task will have been added to the xPendingReadyList. Once the
\r
1184 scheduler has been resumed it is safe to move all the pending ready
\r
1185 tasks from this list into their appropriate ready list. */
\r
1186 taskENTER_CRITICAL();
\r
1188 --uxSchedulerSuspended;
\r
1190 if( uxSchedulerSuspended == ( unsigned portBASE_TYPE ) pdFALSE )
\r
1192 if( uxCurrentNumberOfTasks > ( unsigned portBASE_TYPE ) 0U )
\r
1194 portBASE_TYPE xYieldRequired = pdFALSE;
\r
1196 /* Move any readied tasks from the pending list into the
\r
1197 appropriate ready list. */
\r
1198 while( listLIST_IS_EMPTY( ( xList * ) &xPendingReadyList ) == pdFALSE )
\r
1200 pxTCB = ( tskTCB * ) listGET_OWNER_OF_HEAD_ENTRY( ( ( xList * ) &xPendingReadyList ) );
\r
1201 vListRemove( &( pxTCB->xEventListItem ) );
\r
1202 vListRemove( &( pxTCB->xGenericListItem ) );
\r
1203 prvAddTaskToReadyQueue( pxTCB );
\r
1205 /* If we have moved a task that has a priority higher than
\r
1206 the current task then we should yield. */
\r
1207 if( pxTCB->uxPriority >= pxCurrentTCB->uxPriority )
\r
1209 xYieldRequired = pdTRUE;
\r
1213 /* If any ticks occurred while the scheduler was suspended then
\r
1214 they should be processed now. This ensures the tick count does not
\r
1215 slip, and that any delayed tasks are resumed at the correct time. */
\r
1216 if( uxMissedTicks > ( unsigned portBASE_TYPE ) 0U )
\r
1218 while( uxMissedTicks > ( unsigned portBASE_TYPE ) 0U )
\r
1220 vTaskIncrementTick();
\r
1224 /* As we have processed some ticks it is appropriate to yield
\r
1225 to ensure the highest priority task that is ready to run is
\r
1226 the task actually running. */
\r
1227 #if configUSE_PREEMPTION == 1
\r
1229 xYieldRequired = pdTRUE;
\r
1234 if( ( xYieldRequired == pdTRUE ) || ( xMissedYield == pdTRUE ) )
\r
1236 xAlreadyYielded = pdTRUE;
\r
1237 xMissedYield = pdFALSE;
\r
1238 portYIELD_WITHIN_API();
\r
1243 taskEXIT_CRITICAL();
\r
1245 return xAlreadyYielded;
\r
1253 /*-----------------------------------------------------------
\r
1254 * PUBLIC TASK UTILITIES documented in task.h
\r
1255 *----------------------------------------------------------*/
\r
1259 portTickType xTaskGetTickCount( void )
\r
1261 portTickType xTicks;
\r
1263 /* Critical section required if running on a 16 bit processor. */
\r
1264 taskENTER_CRITICAL();
\r
1266 xTicks = xTickCount;
\r
1268 taskEXIT_CRITICAL();
\r
1272 /*-----------------------------------------------------------*/
\r
1274 portTickType xTaskGetTickCountFromISR( void )
\r
1276 portTickType xReturn;
\r
1277 unsigned portBASE_TYPE uxSavedInterruptStatus;
\r
1279 uxSavedInterruptStatus = portSET_INTERRUPT_MASK_FROM_ISR();
\r
1280 xReturn = xTickCount;
\r
1281 portCLEAR_INTERRUPT_MASK_FROM_ISR( uxSavedInterruptStatus );
\r
1285 /*-----------------------------------------------------------*/
\r
1287 unsigned portBASE_TYPE uxTaskGetNumberOfTasks( void )
\r
1289 /* A critical section is not required because the variables are of type
\r
1291 return uxCurrentNumberOfTasks;
\r
1293 /*-----------------------------------------------------------*/
\r
1295 #if ( INCLUDE_pcTaskGetTaskName == 1 )
\r
1297 signed char *pcTaskGetTaskName( xTaskHandle xTaskToQuery )
\r
1301 /* If null is passed in here then the name of the calling task is being queried. */
\r
1302 pxTCB = prvGetTCBFromHandle( xTaskToQuery );
\r
1303 configASSERT( pxTCB );
\r
1304 return &( pxTCB->pcTaskName[ 0 ] );
\r
1308 /*-----------------------------------------------------------*/
\r
1310 #if ( configUSE_TRACE_FACILITY == 1 )
\r
1312 void vTaskList( signed char *pcWriteBuffer )
\r
1314 unsigned portBASE_TYPE uxQueue;
\r
1316 /* This is a VERY costly function that should be used for debug only.
\r
1317 It leaves interrupts disabled for a LONG time. */
\r
1319 vTaskSuspendAll();
\r
1321 /* Run through all the lists that could potentially contain a TCB and
\r
1322 report the task name, state and stack high water mark. */
\r
1324 *pcWriteBuffer = ( signed char ) 0x00;
\r
1325 strcat( ( char * ) pcWriteBuffer, ( const char * ) "\r\n" );
\r
1327 uxQueue = uxTopUsedPriority + ( unsigned portBASE_TYPE ) 1U;
\r
1333 if( listLIST_IS_EMPTY( &( pxReadyTasksLists[ uxQueue ] ) ) == pdFALSE )
\r
1335 prvListTaskWithinSingleList( pcWriteBuffer, ( xList * ) &( pxReadyTasksLists[ uxQueue ] ), tskREADY_CHAR );
\r
1337 }while( uxQueue > ( unsigned short ) tskIDLE_PRIORITY );
\r
1339 if( listLIST_IS_EMPTY( pxDelayedTaskList ) == pdFALSE )
\r
1341 prvListTaskWithinSingleList( pcWriteBuffer, ( xList * ) pxDelayedTaskList, tskBLOCKED_CHAR );
\r
1344 if( listLIST_IS_EMPTY( pxOverflowDelayedTaskList ) == pdFALSE )
\r
1346 prvListTaskWithinSingleList( pcWriteBuffer, ( xList * ) pxOverflowDelayedTaskList, tskBLOCKED_CHAR );
\r
1349 #if( INCLUDE_vTaskDelete == 1 )
\r
1351 if( listLIST_IS_EMPTY( &xTasksWaitingTermination ) == pdFALSE )
\r
1353 prvListTaskWithinSingleList( pcWriteBuffer, &xTasksWaitingTermination, tskDELETED_CHAR );
\r
1358 #if ( INCLUDE_vTaskSuspend == 1 )
\r
1360 if( listLIST_IS_EMPTY( &xSuspendedTaskList ) == pdFALSE )
\r
1362 prvListTaskWithinSingleList( pcWriteBuffer, &xSuspendedTaskList, tskSUSPENDED_CHAR );
\r
1371 /*----------------------------------------------------------*/
\r
1373 #if ( configGENERATE_RUN_TIME_STATS == 1 )
\r
1375 void vTaskGetRunTimeStats( signed char *pcWriteBuffer )
\r
1377 unsigned portBASE_TYPE uxQueue;
\r
1378 unsigned long ulTotalRunTime;
\r
1380 /* This is a VERY costly function that should be used for debug only.
\r
1381 It leaves interrupts disabled for a LONG time. */
\r
1383 vTaskSuspendAll();
\r
1385 #ifdef portALT_GET_RUN_TIME_COUNTER_VALUE
\r
1386 portALT_GET_RUN_TIME_COUNTER_VALUE( ulTotalRunTime );
\r
1388 ulTotalRunTime = portGET_RUN_TIME_COUNTER_VALUE();
\r
1391 /* Divide ulTotalRunTime by 100 to make the percentage caluclations
\r
1392 simpler in the prvGenerateRunTimeStatsForTasksInList() function. */
\r
1393 ulTotalRunTime /= 100UL;
\r
1395 /* Run through all the lists that could potentially contain a TCB,
\r
1396 generating a table of run timer percentages in the provided
\r
1399 *pcWriteBuffer = ( signed char ) 0x00;
\r
1400 strcat( ( char * ) pcWriteBuffer, ( const char * ) "\r\n" );
\r
1402 uxQueue = uxTopUsedPriority + ( unsigned portBASE_TYPE ) 1U;
\r
1408 if( listLIST_IS_EMPTY( &( pxReadyTasksLists[ uxQueue ] ) ) == pdFALSE )
\r
1410 prvGenerateRunTimeStatsForTasksInList( pcWriteBuffer, ( xList * ) &( pxReadyTasksLists[ uxQueue ] ), ulTotalRunTime );
\r
1412 }while( uxQueue > ( unsigned short ) tskIDLE_PRIORITY );
\r
1414 if( listLIST_IS_EMPTY( pxDelayedTaskList ) == pdFALSE )
\r
1416 prvGenerateRunTimeStatsForTasksInList( pcWriteBuffer, ( xList * ) pxDelayedTaskList, ulTotalRunTime );
\r
1419 if( listLIST_IS_EMPTY( pxOverflowDelayedTaskList ) == pdFALSE )
\r
1421 prvGenerateRunTimeStatsForTasksInList( pcWriteBuffer, ( xList * ) pxOverflowDelayedTaskList, ulTotalRunTime );
\r
1424 #if ( INCLUDE_vTaskDelete == 1 )
\r
1426 if( listLIST_IS_EMPTY( &xTasksWaitingTermination ) == pdFALSE )
\r
1428 prvGenerateRunTimeStatsForTasksInList( pcWriteBuffer, &xTasksWaitingTermination, ulTotalRunTime );
\r
1433 #if ( INCLUDE_vTaskSuspend == 1 )
\r
1435 if( listLIST_IS_EMPTY( &xSuspendedTaskList ) == pdFALSE )
\r
1437 prvGenerateRunTimeStatsForTasksInList( pcWriteBuffer, &xSuspendedTaskList, ulTotalRunTime );
\r
1446 /*----------------------------------------------------------*/
\r
1448 #if ( configUSE_TRACE_FACILITY == 1 )
\r
1450 void vTaskStartTrace( signed char * pcBuffer, unsigned long ulBufferSize )
\r
1452 configASSERT( pcBuffer );
\r
1453 configASSERT( ulBufferSize );
\r
1455 taskENTER_CRITICAL();
\r
1457 pcTraceBuffer = ( signed char * )pcBuffer;
\r
1458 pcTraceBufferStart = pcBuffer;
\r
1459 pcTraceBufferEnd = pcBuffer + ( ulBufferSize - tskSIZE_OF_EACH_TRACE_LINE );
\r
1460 xTracing = pdTRUE;
\r
1462 taskEXIT_CRITICAL();
\r
1466 /*----------------------------------------------------------*/
\r
1468 #if ( configUSE_TRACE_FACILITY == 1 )
\r
1470 unsigned long ulTaskEndTrace( void )
\r
1472 unsigned long ulBufferLength;
\r
1474 taskENTER_CRITICAL();
\r
1475 xTracing = pdFALSE;
\r
1476 taskEXIT_CRITICAL();
\r
1478 ulBufferLength = ( unsigned long ) ( pcTraceBuffer - pcTraceBufferStart );
\r
1480 return ulBufferLength;
\r
1484 /*----------------------------------------------------------*/
\r
1486 #if ( INCLUDE_xTaskGetIdleTaskHandle == 1 )
\r
1488 xTaskHandle xTaskGetIdleTaskHandle( void )
\r
1490 /* If xTaskGetIdleTaskHandle() is called before the scheduler has been
\r
1491 started, then xIdleTaskHandle will be NULL. */
\r
1492 configASSERT( ( xIdleTaskHandle != NULL ) );
\r
1493 return xIdleTaskHandle;
\r
1498 /*-----------------------------------------------------------
\r
1499 * SCHEDULER INTERNALS AVAILABLE FOR PORTING PURPOSES
\r
1500 * documented in task.h
\r
1501 *----------------------------------------------------------*/
\r
1503 void vTaskIncrementTick( void )
\r
1507 /* Called by the portable layer each time a tick interrupt occurs.
\r
1508 Increments the tick then checks to see if the new tick value will cause any
\r
1509 tasks to be unblocked. */
\r
1510 if( uxSchedulerSuspended == ( unsigned portBASE_TYPE ) pdFALSE )
\r
1513 if( xTickCount == ( portTickType ) 0U )
\r
1517 /* Tick count has overflowed so we need to swap the delay lists.
\r
1518 If there are any items in pxDelayedTaskList here then there is
\r
1520 configASSERT( ( listLIST_IS_EMPTY( pxDelayedTaskList ) ) );
\r
1522 pxTemp = pxDelayedTaskList;
\r
1523 pxDelayedTaskList = pxOverflowDelayedTaskList;
\r
1524 pxOverflowDelayedTaskList = pxTemp;
\r
1525 xNumOfOverflows++;
\r
1527 if( listLIST_IS_EMPTY( pxDelayedTaskList ) != pdFALSE )
\r
1529 /* The new current delayed list is empty. Set
\r
1530 xNextTaskUnblockTime to the maximum possible value so it is
\r
1531 extremely unlikely that the
\r
1532 if( xTickCount >= xNextTaskUnblockTime ) test will pass until
\r
1533 there is an item in the delayed list. */
\r
1534 xNextTaskUnblockTime = portMAX_DELAY;
\r
1538 /* The new current delayed list is not empty, get the value of
\r
1539 the item at the head of the delayed list. This is the time at
\r
1540 which the task at the head of the delayed list should be removed
\r
1541 from the Blocked state. */
\r
1542 pxTCB = ( tskTCB * ) listGET_OWNER_OF_HEAD_ENTRY( pxDelayedTaskList );
\r
1543 xNextTaskUnblockTime = listGET_LIST_ITEM_VALUE( &( pxTCB->xGenericListItem ) );
\r
1547 /* See if this tick has made a timeout expire. */
\r
1548 prvCheckDelayedTasks();
\r
1554 /* The tick hook gets called at regular intervals, even if the
\r
1555 scheduler is locked. */
\r
1556 #if ( configUSE_TICK_HOOK == 1 )
\r
1558 vApplicationTickHook();
\r
1563 #if ( configUSE_TICK_HOOK == 1 )
\r
1565 /* Guard against the tick hook being called when the missed tick
\r
1566 count is being unwound (when the scheduler is being unlocked. */
\r
1567 if( uxMissedTicks == ( unsigned portBASE_TYPE ) 0U )
\r
1569 vApplicationTickHook();
\r
1574 traceTASK_INCREMENT_TICK( xTickCount );
\r
1576 /*-----------------------------------------------------------*/
\r
1578 #if ( configUSE_APPLICATION_TASK_TAG == 1 )
\r
1580 void vTaskSetApplicationTaskTag( xTaskHandle xTask, pdTASK_HOOK_CODE pxHookFunction )
\r
1584 /* If xTask is NULL then we are setting our own task hook. */
\r
1585 if( xTask == NULL )
\r
1587 xTCB = ( tskTCB * ) pxCurrentTCB;
\r
1591 xTCB = ( tskTCB * ) xTask;
\r
1594 /* Save the hook function in the TCB. A critical section is required as
\r
1595 the value can be accessed from an interrupt. */
\r
1596 taskENTER_CRITICAL();
\r
1597 xTCB->pxTaskTag = pxHookFunction;
\r
1598 taskEXIT_CRITICAL();
\r
1602 /*-----------------------------------------------------------*/
\r
1604 #if ( configUSE_APPLICATION_TASK_TAG == 1 )
\r
1606 pdTASK_HOOK_CODE xTaskGetApplicationTaskTag( xTaskHandle xTask )
\r
1609 pdTASK_HOOK_CODE xReturn;
\r
1611 /* If xTask is NULL then we are setting our own task hook. */
\r
1612 if( xTask == NULL )
\r
1614 xTCB = ( tskTCB * ) pxCurrentTCB;
\r
1618 xTCB = ( tskTCB * ) xTask;
\r
1621 /* Save the hook function in the TCB. A critical section is required as
\r
1622 the value can be accessed from an interrupt. */
\r
1623 taskENTER_CRITICAL();
\r
1624 xReturn = xTCB->pxTaskTag;
\r
1625 taskEXIT_CRITICAL();
\r
1631 /*-----------------------------------------------------------*/
\r
1633 #if ( configUSE_APPLICATION_TASK_TAG == 1 )
\r
1635 portBASE_TYPE xTaskCallApplicationTaskHook( xTaskHandle xTask, void *pvParameter )
\r
1638 portBASE_TYPE xReturn;
\r
1640 /* If xTask is NULL then we are calling our own task hook. */
\r
1641 if( xTask == NULL )
\r
1643 xTCB = ( tskTCB * ) pxCurrentTCB;
\r
1647 xTCB = ( tskTCB * ) xTask;
\r
1650 if( xTCB->pxTaskTag != NULL )
\r
1652 xReturn = xTCB->pxTaskTag( pvParameter );
\r
1663 /*-----------------------------------------------------------*/
\r
1665 void vTaskSwitchContext( void )
\r
1667 if( uxSchedulerSuspended != ( unsigned portBASE_TYPE ) pdFALSE )
\r
1669 /* The scheduler is currently suspended - do not allow a context
\r
1671 xMissedYield = pdTRUE;
\r
1675 traceTASK_SWITCHED_OUT();
\r
1677 #if ( configGENERATE_RUN_TIME_STATS == 1 )
\r
1679 unsigned long ulTempCounter;
\r
1681 #ifdef portALT_GET_RUN_TIME_COUNTER_VALUE
\r
1682 portALT_GET_RUN_TIME_COUNTER_VALUE( ulTempCounter );
\r
1684 ulTempCounter = portGET_RUN_TIME_COUNTER_VALUE();
\r
1687 /* Add the amount of time the task has been running to the accumulated
\r
1688 time so far. The time the task started running was stored in
\r
1689 ulTaskSwitchedInTime. Note that there is no overflow protection here
\r
1690 so count values are only valid until the timer overflows. Generally
\r
1691 this will be about 1 hour assuming a 1uS timer increment. */
\r
1692 pxCurrentTCB->ulRunTimeCounter += ( ulTempCounter - ulTaskSwitchedInTime );
\r
1693 ulTaskSwitchedInTime = ulTempCounter;
\r
1697 taskFIRST_CHECK_FOR_STACK_OVERFLOW();
\r
1698 taskSECOND_CHECK_FOR_STACK_OVERFLOW();
\r
1700 /* Find the highest priority queue that contains ready tasks. */
\r
1701 while( listLIST_IS_EMPTY( &( pxReadyTasksLists[ uxTopReadyPriority ] ) ) )
\r
1703 configASSERT( uxTopReadyPriority );
\r
1704 --uxTopReadyPriority;
\r
1707 /* listGET_OWNER_OF_NEXT_ENTRY walks through the list, so the tasks of the
\r
1708 same priority get an equal share of the processor time. */
\r
1709 listGET_OWNER_OF_NEXT_ENTRY( pxCurrentTCB, &( pxReadyTasksLists[ uxTopReadyPriority ] ) );
\r
1711 traceTASK_SWITCHED_IN();
\r
1712 vWriteTraceToBuffer();
\r
1715 /*-----------------------------------------------------------*/
\r
1717 void vTaskPlaceOnEventList( const xList * const pxEventList, portTickType xTicksToWait )
\r
1719 portTickType xTimeToWake;
\r
1721 configASSERT( pxEventList );
\r
1723 /* THIS FUNCTION MUST BE CALLED WITH INTERRUPTS DISABLED OR THE
\r
1724 SCHEDULER SUSPENDED. */
\r
1726 /* Place the event list item of the TCB in the appropriate event list.
\r
1727 This is placed in the list in priority order so the highest priority task
\r
1728 is the first to be woken by the event. */
\r
1729 vListInsert( ( xList * ) pxEventList, ( xListItem * ) &( pxCurrentTCB->xEventListItem ) );
\r
1731 /* We must remove ourselves from the ready list before adding ourselves
\r
1732 to the blocked list as the same list item is used for both lists. We have
\r
1733 exclusive access to the ready lists as the scheduler is locked. */
\r
1734 vListRemove( ( xListItem * ) &( pxCurrentTCB->xGenericListItem ) );
\r
1737 #if ( INCLUDE_vTaskSuspend == 1 )
\r
1739 if( xTicksToWait == portMAX_DELAY )
\r
1741 /* Add ourselves to the suspended task list instead of a delayed task
\r
1742 list to ensure we are not woken by a timing event. We will block
\r
1744 vListInsertEnd( ( xList * ) &xSuspendedTaskList, ( xListItem * ) &( pxCurrentTCB->xGenericListItem ) );
\r
1748 /* Calculate the time at which the task should be woken if the event does
\r
1749 not occur. This may overflow but this doesn't matter. */
\r
1750 xTimeToWake = xTickCount + xTicksToWait;
\r
1751 prvAddCurrentTaskToDelayedList( xTimeToWake );
\r
1756 /* Calculate the time at which the task should be woken if the event does
\r
1757 not occur. This may overflow but this doesn't matter. */
\r
1758 xTimeToWake = xTickCount + xTicksToWait;
\r
1759 prvAddCurrentTaskToDelayedList( xTimeToWake );
\r
1763 /*-----------------------------------------------------------*/
\r
1765 #if configUSE_TIMERS == 1
\r
1767 void vTaskPlaceOnEventListRestricted( const xList * const pxEventList, portTickType xTicksToWait )
\r
1769 portTickType xTimeToWake;
\r
1771 configASSERT( pxEventList );
\r
1773 /* This function should not be called by application code hence the
\r
1774 'Restricted' in its name. It is not part of the public API. It is
\r
1775 designed for use by kernel code, and has special calling requirements -
\r
1776 it should be called from a critical section. */
\r
1779 /* Place the event list item of the TCB in the appropriate event list.
\r
1780 In this case it is assume that this is the only task that is going to
\r
1781 be waiting on this event list, so the faster vListInsertEnd() function
\r
1782 can be used in place of vListInsert. */
\r
1783 vListInsertEnd( ( xList * ) pxEventList, ( xListItem * ) &( pxCurrentTCB->xEventListItem ) );
\r
1785 /* We must remove this task from the ready list before adding it to the
\r
1786 blocked list as the same list item is used for both lists. This
\r
1787 function is called form a critical section. */
\r
1788 vListRemove( ( xListItem * ) &( pxCurrentTCB->xGenericListItem ) );
\r
1790 /* Calculate the time at which the task should be woken if the event does
\r
1791 not occur. This may overflow but this doesn't matter. */
\r
1792 xTimeToWake = xTickCount + xTicksToWait;
\r
1793 prvAddCurrentTaskToDelayedList( xTimeToWake );
\r
1796 #endif /* configUSE_TIMERS */
\r
1797 /*-----------------------------------------------------------*/
\r
1799 signed portBASE_TYPE xTaskRemoveFromEventList( const xList * const pxEventList )
\r
1801 tskTCB *pxUnblockedTCB;
\r
1802 portBASE_TYPE xReturn;
\r
1804 /* THIS FUNCTION MUST BE CALLED WITH INTERRUPTS DISABLED OR THE
\r
1805 SCHEDULER SUSPENDED. It can also be called from within an ISR. */
\r
1807 /* The event list is sorted in priority order, so we can remove the
\r
1808 first in the list, remove the TCB from the delayed list, and add
\r
1809 it to the ready list.
\r
1811 If an event is for a queue that is locked then this function will never
\r
1812 get called - the lock count on the queue will get modified instead. This
\r
1813 means we can always expect exclusive access to the event list here.
\r
1815 This function assumes that a check has already been made to ensure that
\r
1816 pxEventList is not empty. */
\r
1817 pxUnblockedTCB = ( tskTCB * ) listGET_OWNER_OF_HEAD_ENTRY( pxEventList );
\r
1818 configASSERT( pxUnblockedTCB );
\r
1819 vListRemove( &( pxUnblockedTCB->xEventListItem ) );
\r
1821 if( uxSchedulerSuspended == ( unsigned portBASE_TYPE ) pdFALSE )
\r
1823 vListRemove( &( pxUnblockedTCB->xGenericListItem ) );
\r
1824 prvAddTaskToReadyQueue( pxUnblockedTCB );
\r
1828 /* We cannot access the delayed or ready lists, so will hold this
\r
1829 task pending until the scheduler is resumed. */
\r
1830 vListInsertEnd( ( xList * ) &( xPendingReadyList ), &( pxUnblockedTCB->xEventListItem ) );
\r
1833 if( pxUnblockedTCB->uxPriority >= pxCurrentTCB->uxPriority )
\r
1835 /* Return true if the task removed from the event list has
\r
1836 a higher priority than the calling task. This allows
\r
1837 the calling task to know if it should force a context
\r
1843 xReturn = pdFALSE;
\r
1848 /*-----------------------------------------------------------*/
\r
1850 void vTaskSetTimeOutState( xTimeOutType * const pxTimeOut )
\r
1852 configASSERT( pxTimeOut );
\r
1853 pxTimeOut->xOverflowCount = xNumOfOverflows;
\r
1854 pxTimeOut->xTimeOnEntering = xTickCount;
\r
1856 /*-----------------------------------------------------------*/
\r
1858 portBASE_TYPE xTaskCheckForTimeOut( xTimeOutType * const pxTimeOut, portTickType * const pxTicksToWait )
\r
1860 portBASE_TYPE xReturn;
\r
1862 configASSERT( pxTimeOut );
\r
1863 configASSERT( pxTicksToWait );
\r
1865 taskENTER_CRITICAL();
\r
1867 #if ( INCLUDE_vTaskSuspend == 1 )
\r
1868 /* If INCLUDE_vTaskSuspend is set to 1 and the block time specified is
\r
1869 the maximum block time then the task should block indefinitely, and
\r
1870 therefore never time out. */
\r
1871 if( *pxTicksToWait == portMAX_DELAY )
\r
1873 xReturn = pdFALSE;
\r
1875 else /* We are not blocking indefinitely, perform the checks below. */
\r
1878 if( ( xNumOfOverflows != pxTimeOut->xOverflowCount ) && ( ( portTickType ) xTickCount >= ( portTickType ) pxTimeOut->xTimeOnEntering ) )
\r
1880 /* The tick count is greater than the time at which vTaskSetTimeout()
\r
1881 was called, but has also overflowed since vTaskSetTimeOut() was called.
\r
1882 It must have wrapped all the way around and gone past us again. This
\r
1883 passed since vTaskSetTimeout() was called. */
\r
1886 else if( ( ( portTickType ) ( ( portTickType ) xTickCount - ( portTickType ) pxTimeOut->xTimeOnEntering ) ) < ( portTickType ) *pxTicksToWait )
\r
1888 /* Not a genuine timeout. Adjust parameters for time remaining. */
\r
1889 *pxTicksToWait -= ( ( portTickType ) xTickCount - ( portTickType ) pxTimeOut->xTimeOnEntering );
\r
1890 vTaskSetTimeOutState( pxTimeOut );
\r
1891 xReturn = pdFALSE;
\r
1898 taskEXIT_CRITICAL();
\r
1902 /*-----------------------------------------------------------*/
\r
1904 void vTaskMissedYield( void )
\r
1906 xMissedYield = pdTRUE;
\r
1910 * -----------------------------------------------------------
\r
1912 * ----------------------------------------------------------
\r
1914 * The portTASK_FUNCTION() macro is used to allow port/compiler specific
\r
1915 * language extensions. The equivalent prototype for this function is:
\r
1917 * void prvIdleTask( void *pvParameters );
\r
1920 static portTASK_FUNCTION( prvIdleTask, pvParameters )
\r
1922 /* Stop warnings. */
\r
1923 ( void ) pvParameters;
\r
1927 /* See if any tasks have been deleted. */
\r
1928 prvCheckTasksWaitingTermination();
\r
1930 #if ( configUSE_PREEMPTION == 0 )
\r
1932 /* If we are not using preemption we keep forcing a task switch to
\r
1933 see if any other task has become available. If we are using
\r
1934 preemption we don't need to do this as any task becoming available
\r
1935 will automatically get the processor anyway. */
\r
1940 #if ( ( configUSE_PREEMPTION == 1 ) && ( configIDLE_SHOULD_YIELD == 1 ) )
\r
1942 /* When using preemption tasks of equal priority will be
\r
1943 timesliced. If a task that is sharing the idle priority is ready
\r
1944 to run then the idle task should yield before the end of the
\r
1947 A critical region is not required here as we are just reading from
\r
1948 the list, and an occasional incorrect value will not matter. If
\r
1949 the ready list at the idle priority contains more than one task
\r
1950 then a task other than the idle task is ready to execute. */
\r
1951 if( listCURRENT_LIST_LENGTH( &( pxReadyTasksLists[ tskIDLE_PRIORITY ] ) ) > ( unsigned portBASE_TYPE ) 1 )
\r
1958 #if ( configUSE_IDLE_HOOK == 1 )
\r
1960 extern void vApplicationIdleHook( void );
\r
1962 /* Call the user defined function from within the idle task. This
\r
1963 allows the application designer to add background functionality
\r
1964 without the overhead of a separate task.
\r
1965 NOTE: vApplicationIdleHook() MUST NOT, UNDER ANY CIRCUMSTANCES,
\r
1966 CALL A FUNCTION THAT MIGHT BLOCK. */
\r
1967 vApplicationIdleHook();
\r
1971 } /*lint !e715 pvParameters is not accessed but all task functions require the same prototype. */
\r
1979 /*-----------------------------------------------------------
\r
1980 * File private functions documented at the top of the file.
\r
1981 *----------------------------------------------------------*/
\r
1985 static void prvInitialiseTCBVariables( tskTCB *pxTCB, const signed char * const pcName, unsigned portBASE_TYPE uxPriority, const xMemoryRegion * const xRegions, unsigned short usStackDepth )
\r
1987 /* Store the function name in the TCB. */
\r
1988 #if configMAX_TASK_NAME_LEN > 1
\r
1990 /* Don't bring strncpy into the build unnecessarily. */
\r
1991 strncpy( ( char * ) pxTCB->pcTaskName, ( const char * ) pcName, ( unsigned short ) configMAX_TASK_NAME_LEN );
\r
1994 pxTCB->pcTaskName[ ( unsigned short ) configMAX_TASK_NAME_LEN - ( unsigned short ) 1 ] = ( signed char ) '\0';
\r
1996 /* This is used as an array index so must ensure it's not too large. First
\r
1997 remove the privilege bit if one is present. */
\r
1998 if( uxPriority >= configMAX_PRIORITIES )
\r
2000 uxPriority = configMAX_PRIORITIES - ( unsigned portBASE_TYPE ) 1U;
\r
2003 pxTCB->uxPriority = uxPriority;
\r
2004 #if ( configUSE_MUTEXES == 1 )
\r
2006 pxTCB->uxBasePriority = uxPriority;
\r
2010 vListInitialiseItem( &( pxTCB->xGenericListItem ) );
\r
2011 vListInitialiseItem( &( pxTCB->xEventListItem ) );
\r
2013 /* Set the pxTCB as a link back from the xListItem. This is so we can get
\r
2014 back to the containing TCB from a generic item in a list. */
\r
2015 listSET_LIST_ITEM_OWNER( &( pxTCB->xGenericListItem ), pxTCB );
\r
2017 /* Event lists are always in priority order. */
\r
2018 listSET_LIST_ITEM_VALUE( &( pxTCB->xEventListItem ), configMAX_PRIORITIES - ( portTickType ) uxPriority );
\r
2019 listSET_LIST_ITEM_OWNER( &( pxTCB->xEventListItem ), pxTCB );
\r
2021 #if ( portCRITICAL_NESTING_IN_TCB == 1 )
\r
2023 pxTCB->uxCriticalNesting = ( unsigned portBASE_TYPE ) 0U;
\r
2027 #if ( configUSE_APPLICATION_TASK_TAG == 1 )
\r
2029 pxTCB->pxTaskTag = NULL;
\r
2033 #if ( configGENERATE_RUN_TIME_STATS == 1 )
\r
2035 pxTCB->ulRunTimeCounter = 0UL;
\r
2039 #if ( portUSING_MPU_WRAPPERS == 1 )
\r
2041 vPortStoreTaskMPUSettings( &( pxTCB->xMPUSettings ), xRegions, pxTCB->pxStack, usStackDepth );
\r
2045 ( void ) xRegions;
\r
2046 ( void ) usStackDepth;
\r
2050 /*-----------------------------------------------------------*/
\r
2052 #if ( portUSING_MPU_WRAPPERS == 1 )
\r
2054 void vTaskAllocateMPURegions( xTaskHandle xTaskToModify, const xMemoryRegion * const xRegions )
\r
2058 if( xTaskToModify == pxCurrentTCB )
\r
2060 xTaskToModify = NULL;
\r
2063 /* If null is passed in here then we are deleting ourselves. */
\r
2064 pxTCB = prvGetTCBFromHandle( xTaskToModify );
\r
2066 vPortStoreTaskMPUSettings( &( pxTCB->xMPUSettings ), xRegions, NULL, 0 );
\r
2068 /*-----------------------------------------------------------*/
\r
2071 static void prvInitialiseTaskLists( void )
\r
2073 unsigned portBASE_TYPE uxPriority;
\r
2075 for( uxPriority = ( unsigned portBASE_TYPE ) 0U; uxPriority < configMAX_PRIORITIES; uxPriority++ )
\r
2077 vListInitialise( ( xList * ) &( pxReadyTasksLists[ uxPriority ] ) );
\r
2080 vListInitialise( ( xList * ) &xDelayedTaskList1 );
\r
2081 vListInitialise( ( xList * ) &xDelayedTaskList2 );
\r
2082 vListInitialise( ( xList * ) &xPendingReadyList );
\r
2084 #if ( INCLUDE_vTaskDelete == 1 )
\r
2086 vListInitialise( ( xList * ) &xTasksWaitingTermination );
\r
2090 #if ( INCLUDE_vTaskSuspend == 1 )
\r
2092 vListInitialise( ( xList * ) &xSuspendedTaskList );
\r
2096 /* Start with pxDelayedTaskList using list1 and the pxOverflowDelayedTaskList
\r
2098 pxDelayedTaskList = &xDelayedTaskList1;
\r
2099 pxOverflowDelayedTaskList = &xDelayedTaskList2;
\r
2101 /*-----------------------------------------------------------*/
\r
2103 static void prvCheckTasksWaitingTermination( void )
\r
2105 #if ( INCLUDE_vTaskDelete == 1 )
\r
2107 portBASE_TYPE xListIsEmpty;
\r
2109 /* ucTasksDeleted is used to prevent vTaskSuspendAll() being called
\r
2110 too often in the idle task. */
\r
2111 if( uxTasksDeleted > ( unsigned portBASE_TYPE ) 0U )
\r
2113 vTaskSuspendAll();
\r
2114 xListIsEmpty = listLIST_IS_EMPTY( &xTasksWaitingTermination );
\r
2117 if( xListIsEmpty == pdFALSE )
\r
2121 taskENTER_CRITICAL();
\r
2123 pxTCB = ( tskTCB * ) listGET_OWNER_OF_HEAD_ENTRY( ( ( xList * ) &xTasksWaitingTermination ) );
\r
2124 vListRemove( &( pxTCB->xGenericListItem ) );
\r
2125 --uxCurrentNumberOfTasks;
\r
2128 taskEXIT_CRITICAL();
\r
2130 prvDeleteTCB( pxTCB );
\r
2136 /*-----------------------------------------------------------*/
\r
2138 static void prvAddCurrentTaskToDelayedList( portTickType xTimeToWake )
\r
2140 /* The list item will be inserted in wake time order. */
\r
2141 listSET_LIST_ITEM_VALUE( &( pxCurrentTCB->xGenericListItem ), xTimeToWake );
\r
2143 if( xTimeToWake < xTickCount )
\r
2145 /* Wake time has overflowed. Place this item in the overflow list. */
\r
2146 vListInsert( ( xList * ) pxOverflowDelayedTaskList, ( xListItem * ) &( pxCurrentTCB->xGenericListItem ) );
\r
2150 /* The wake time has not overflowed, so we can use the current block list. */
\r
2151 vListInsert( ( xList * ) pxDelayedTaskList, ( xListItem * ) &( pxCurrentTCB->xGenericListItem ) );
\r
2153 /* If the task entering the blocked state was placed at the head of the
\r
2154 list of blocked tasks then xNextTaskUnblockTime needs to be updated
\r
2156 if( xTimeToWake < xNextTaskUnblockTime )
\r
2158 xNextTaskUnblockTime = xTimeToWake;
\r
2162 /*-----------------------------------------------------------*/
\r
2164 static tskTCB *prvAllocateTCBAndStack( unsigned short usStackDepth, portSTACK_TYPE *puxStackBuffer )
\r
2168 /* Allocate space for the TCB. Where the memory comes from depends on
\r
2169 the implementation of the port malloc function. */
\r
2170 pxNewTCB = ( tskTCB * ) pvPortMalloc( sizeof( tskTCB ) );
\r
2172 if( pxNewTCB != NULL )
\r
2174 /* Allocate space for the stack used by the task being created.
\r
2175 The base of the stack memory stored in the TCB so the task can
\r
2176 be deleted later if required. */
\r
2177 pxNewTCB->pxStack = ( portSTACK_TYPE * ) pvPortMallocAligned( ( ( ( size_t )usStackDepth ) * sizeof( portSTACK_TYPE ) ), puxStackBuffer );
\r
2179 if( pxNewTCB->pxStack == NULL )
\r
2181 /* Could not allocate the stack. Delete the allocated TCB. */
\r
2182 vPortFree( pxNewTCB );
\r
2187 /* Just to help debugging. */
\r
2188 memset( pxNewTCB->pxStack, ( int ) tskSTACK_FILL_BYTE, ( size_t ) usStackDepth * sizeof( portSTACK_TYPE ) );
\r
2194 /*-----------------------------------------------------------*/
\r
2196 #if ( configUSE_TRACE_FACILITY == 1 )
\r
2198 static void prvListTaskWithinSingleList( const signed char *pcWriteBuffer, xList *pxList, signed char cStatus )
\r
2200 volatile tskTCB *pxNextTCB, *pxFirstTCB;
\r
2201 unsigned short usStackRemaining;
\r
2203 /* Write the details of all the TCB's in pxList into the buffer. */
\r
2204 listGET_OWNER_OF_NEXT_ENTRY( pxFirstTCB, pxList );
\r
2207 listGET_OWNER_OF_NEXT_ENTRY( pxNextTCB, pxList );
\r
2208 #if ( portSTACK_GROWTH > 0 )
\r
2210 usStackRemaining = usTaskCheckFreeStackSpace( ( unsigned char * ) pxNextTCB->pxEndOfStack );
\r
2214 usStackRemaining = usTaskCheckFreeStackSpace( ( unsigned char * ) pxNextTCB->pxStack );
\r
2218 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 );
\r
2219 strcat( ( char * ) pcWriteBuffer, ( char * ) pcStatusString );
\r
2221 } while( pxNextTCB != pxFirstTCB );
\r
2225 /*-----------------------------------------------------------*/
\r
2227 #if ( configGENERATE_RUN_TIME_STATS == 1 )
\r
2229 static void prvGenerateRunTimeStatsForTasksInList( const signed char *pcWriteBuffer, xList *pxList, unsigned long ulTotalRunTime )
\r
2231 volatile tskTCB *pxNextTCB, *pxFirstTCB;
\r
2232 unsigned long ulStatsAsPercentage;
\r
2234 /* Write the run time stats of all the TCB's in pxList into the buffer. */
\r
2235 listGET_OWNER_OF_NEXT_ENTRY( pxFirstTCB, pxList );
\r
2238 /* Get next TCB in from the list. */
\r
2239 listGET_OWNER_OF_NEXT_ENTRY( pxNextTCB, pxList );
\r
2241 /* Divide by zero check. */
\r
2242 if( ulTotalRunTime > 0UL )
\r
2244 /* Has the task run at all? */
\r
2245 if( pxNextTCB->ulRunTimeCounter == 0UL )
\r
2247 /* The task has used no CPU time at all. */
\r
2248 sprintf( pcStatsString, ( char * ) "%s\t\t0\t\t0%%\r\n", pxNextTCB->pcTaskName );
\r
2252 /* What percentage of the total run time has the task used?
\r
2253 This will always be rounded down to the nearest integer.
\r
2254 ulTotalRunTime has already been divided by 100. */
\r
2255 ulStatsAsPercentage = pxNextTCB->ulRunTimeCounter / ulTotalRunTime;
\r
2257 if( ulStatsAsPercentage > 0UL )
\r
2259 #ifdef portLU_PRINTF_SPECIFIER_REQUIRED
\r
2261 sprintf( pcStatsString, ( char * ) "%s\t\t%lu\t\t%lu%%\r\n", pxNextTCB->pcTaskName, pxNextTCB->ulRunTimeCounter, ulStatsAsPercentage );
\r
2265 /* sizeof( int ) == sizeof( long ) so a smaller
\r
2266 printf() library can be used. */
\r
2267 sprintf( pcStatsString, ( char * ) "%s\t\t%u\t\t%u%%\r\n", pxNextTCB->pcTaskName, ( unsigned int ) pxNextTCB->ulRunTimeCounter, ( unsigned int ) ulStatsAsPercentage );
\r
2273 /* If the percentage is zero here then the task has
\r
2274 consumed less than 1% of the total run time. */
\r
2275 #ifdef portLU_PRINTF_SPECIFIER_REQUIRED
\r
2277 sprintf( pcStatsString, ( char * ) "%s\t\t%lu\t\t<1%%\r\n", pxNextTCB->pcTaskName, pxNextTCB->ulRunTimeCounter );
\r
2281 /* sizeof( int ) == sizeof( long ) so a smaller
\r
2282 printf() library can be used. */
\r
2283 sprintf( pcStatsString, ( char * ) "%s\t\t%u\t\t<1%%\r\n", pxNextTCB->pcTaskName, ( unsigned int ) pxNextTCB->ulRunTimeCounter );
\r
2289 strcat( ( char * ) pcWriteBuffer, ( char * ) pcStatsString );
\r
2292 } while( pxNextTCB != pxFirstTCB );
\r
2296 /*-----------------------------------------------------------*/
\r
2298 #if ( ( configUSE_TRACE_FACILITY == 1 ) || ( INCLUDE_uxTaskGetStackHighWaterMark == 1 ) )
\r
2300 static unsigned short usTaskCheckFreeStackSpace( const unsigned char * pucStackByte )
\r
2302 register unsigned short usCount = 0U;
\r
2304 while( *pucStackByte == tskSTACK_FILL_BYTE )
\r
2306 pucStackByte -= portSTACK_GROWTH;
\r
2310 usCount /= sizeof( portSTACK_TYPE );
\r
2316 /*-----------------------------------------------------------*/
\r
2318 #if ( INCLUDE_uxTaskGetStackHighWaterMark == 1 )
\r
2320 unsigned portBASE_TYPE uxTaskGetStackHighWaterMark( xTaskHandle xTask )
\r
2323 unsigned char *pcEndOfStack;
\r
2324 unsigned portBASE_TYPE uxReturn;
\r
2326 pxTCB = prvGetTCBFromHandle( xTask );
\r
2328 #if portSTACK_GROWTH < 0
\r
2330 pcEndOfStack = ( unsigned char * ) pxTCB->pxStack;
\r
2334 pcEndOfStack = ( unsigned char * ) pxTCB->pxEndOfStack;
\r
2338 uxReturn = ( unsigned portBASE_TYPE ) usTaskCheckFreeStackSpace( pcEndOfStack );
\r
2344 /*-----------------------------------------------------------*/
\r
2346 #if ( INCLUDE_vTaskDelete == 1 )
\r
2348 static void prvDeleteTCB( tskTCB *pxTCB )
\r
2350 /* Free up the memory allocated by the scheduler for the task. It is up to
\r
2351 the task to free any memory allocated at the application level. */
\r
2352 vPortFreeAligned( pxTCB->pxStack );
\r
2353 vPortFree( pxTCB );
\r
2359 /*-----------------------------------------------------------*/
\r
2361 #if ( ( INCLUDE_xTaskGetCurrentTaskHandle == 1 ) || ( configUSE_MUTEXES == 1 ) )
\r
2363 xTaskHandle xTaskGetCurrentTaskHandle( void )
\r
2365 xTaskHandle xReturn;
\r
2367 /* A critical section is not required as this is not called from
\r
2368 an interrupt and the current TCB will always be the same for any
\r
2369 individual execution thread. */
\r
2370 xReturn = pxCurrentTCB;
\r
2377 /*-----------------------------------------------------------*/
\r
2379 #if ( ( INCLUDE_xTaskGetSchedulerState == 1 ) || ( configUSE_TIMERS == 1 ) )
\r
2381 portBASE_TYPE xTaskGetSchedulerState( void )
\r
2383 portBASE_TYPE xReturn;
\r
2385 if( xSchedulerRunning == pdFALSE )
\r
2387 xReturn = taskSCHEDULER_NOT_STARTED;
\r
2391 if( uxSchedulerSuspended == ( unsigned portBASE_TYPE ) pdFALSE )
\r
2393 xReturn = taskSCHEDULER_RUNNING;
\r
2397 xReturn = taskSCHEDULER_SUSPENDED;
\r
2405 /*-----------------------------------------------------------*/
\r
2407 #if ( configUSE_MUTEXES == 1 )
\r
2409 void vTaskPriorityInherit( xTaskHandle * const pxMutexHolder )
\r
2411 tskTCB * const pxTCB = ( tskTCB * ) pxMutexHolder;
\r
2413 configASSERT( pxMutexHolder );
\r
2415 if( pxTCB->uxPriority < pxCurrentTCB->uxPriority )
\r
2417 /* Adjust the mutex holder state to account for its new priority. */
\r
2418 listSET_LIST_ITEM_VALUE( &( pxTCB->xEventListItem ), configMAX_PRIORITIES - ( portTickType ) pxCurrentTCB->uxPriority );
\r
2420 /* If the task being modified is in the ready state it will need to
\r
2421 be moved in to a new list. */
\r
2422 if( listIS_CONTAINED_WITHIN( &( pxReadyTasksLists[ pxTCB->uxPriority ] ), &( pxTCB->xGenericListItem ) ) != pdFALSE )
\r
2424 vListRemove( &( pxTCB->xGenericListItem ) );
\r
2426 /* Inherit the priority before being moved into the new list. */
\r
2427 pxTCB->uxPriority = pxCurrentTCB->uxPriority;
\r
2428 prvAddTaskToReadyQueue( pxTCB );
\r
2432 /* Just inherit the priority. */
\r
2433 pxTCB->uxPriority = pxCurrentTCB->uxPriority;
\r
2439 /*-----------------------------------------------------------*/
\r
2441 #if ( configUSE_MUTEXES == 1 )
\r
2443 void vTaskPriorityDisinherit( xTaskHandle * const pxMutexHolder )
\r
2445 tskTCB * const pxTCB = ( tskTCB * ) pxMutexHolder;
\r
2447 if( pxMutexHolder != NULL )
\r
2449 if( pxTCB->uxPriority != pxTCB->uxBasePriority )
\r
2451 /* We must be the running task to be able to give the mutex back.
\r
2452 Remove ourselves from the ready list we currently appear in. */
\r
2453 vListRemove( &( pxTCB->xGenericListItem ) );
\r
2455 /* Disinherit the priority before adding ourselves into the new
\r
2457 pxTCB->uxPriority = pxTCB->uxBasePriority;
\r
2458 listSET_LIST_ITEM_VALUE( &( pxTCB->xEventListItem ), configMAX_PRIORITIES - ( portTickType ) pxTCB->uxPriority );
\r
2459 prvAddTaskToReadyQueue( pxTCB );
\r
2465 /*-----------------------------------------------------------*/
\r
2467 #if ( portCRITICAL_NESTING_IN_TCB == 1 )
\r
2469 void vTaskEnterCritical( void )
\r
2471 portDISABLE_INTERRUPTS();
\r
2473 if( xSchedulerRunning != pdFALSE )
\r
2475 ( pxCurrentTCB->uxCriticalNesting )++;
\r
2480 /*-----------------------------------------------------------*/
\r
2482 #if ( portCRITICAL_NESTING_IN_TCB == 1 )
\r
2484 void vTaskExitCritical( void )
\r
2486 if( xSchedulerRunning != pdFALSE )
\r
2488 if( pxCurrentTCB->uxCriticalNesting > 0U )
\r
2490 ( pxCurrentTCB->uxCriticalNesting )--;
\r
2492 if( pxCurrentTCB->uxCriticalNesting == 0U )
\r
2494 portENABLE_INTERRUPTS();
\r
2501 /*-----------------------------------------------------------*/
\r
projects / pes-rpp / rpp-test-sw.git / blob