2 * FreeRTOS Kernel <DEVELOPMENT BRANCH>
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3 * Copyright (C) 2021 Amazon.com, Inc. or its affiliates. All Rights Reserved.
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5 * SPDX-License-Identifier: MIT
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7 * Permission is hereby granted, free of charge, to any person obtaining a copy of
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8 * this software and associated documentation files (the "Software"), to deal in
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9 * the Software without restriction, including without limitation the rights to
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10 * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
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11 * the Software, and to permit persons to whom the Software is furnished to do so,
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12 * subject to the following conditions:
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14 * The above copyright notice and this permission notice shall be included in all
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15 * copies or substantial portions of the Software.
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17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
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19 * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
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20 * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
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21 * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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22 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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24 * https://www.FreeRTOS.org
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25 * https://github.com/FreeRTOS
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29 /* Standard includes. */
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33 /* Defining MPU_WRAPPERS_INCLUDED_FROM_API_FILE prevents task.h from redefining
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34 * all the API functions to use the MPU wrappers. That should only be done when
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35 * task.h is included from an application file. */
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36 #define MPU_WRAPPERS_INCLUDED_FROM_API_FILE
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38 /* FreeRTOS includes. */
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39 #include "FreeRTOS.h"
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42 #include "stack_macros.h"
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44 /* Lint e9021, e961 and e750 are suppressed as a MISRA exception justified
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45 * because the MPU ports require MPU_WRAPPERS_INCLUDED_FROM_API_FILE to be defined
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46 * for the header files above, but not in this file, in order to generate the
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47 * correct privileged Vs unprivileged linkage and placement. */
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48 #undef MPU_WRAPPERS_INCLUDED_FROM_API_FILE /*lint !e961 !e750 !e9021. */
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50 /* Set configUSE_STATS_FORMATTING_FUNCTIONS to 2 to include the stats formatting
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51 * functions but without including stdio.h here. */
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52 #if ( configUSE_STATS_FORMATTING_FUNCTIONS == 1 )
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54 /* At the bottom of this file are two optional functions that can be used
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55 * to generate human readable text from the raw data generated by the
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56 * uxTaskGetSystemState() function. Note the formatting functions are provided
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57 * for convenience only, and are NOT considered part of the kernel. */
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59 #endif /* configUSE_STATS_FORMATTING_FUNCTIONS == 1 ) */
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61 #if ( configUSE_PREEMPTION == 0 )
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63 /* If the cooperative scheduler is being used then a yield should not be
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64 * performed just because a higher priority task has been woken. */
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65 #define taskYIELD_IF_USING_PREEMPTION()
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67 #define taskYIELD_IF_USING_PREEMPTION() portYIELD_WITHIN_API()
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70 /* Values that can be assigned to the ucNotifyState member of the TCB. */
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71 #define taskNOT_WAITING_NOTIFICATION ( ( uint8_t ) 0 ) /* Must be zero as it is the initialised value. */
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72 #define taskWAITING_NOTIFICATION ( ( uint8_t ) 1 )
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73 #define taskNOTIFICATION_RECEIVED ( ( uint8_t ) 2 )
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76 * The value used to fill the stack of a task when the task is created. This
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77 * is used purely for checking the high water mark for tasks.
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79 #define tskSTACK_FILL_BYTE ( 0xa5U )
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81 /* Bits used to record how a task's stack and TCB were allocated. */
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82 #define tskDYNAMICALLY_ALLOCATED_STACK_AND_TCB ( ( uint8_t ) 0 )
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83 #define tskSTATICALLY_ALLOCATED_STACK_ONLY ( ( uint8_t ) 1 )
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84 #define tskSTATICALLY_ALLOCATED_STACK_AND_TCB ( ( uint8_t ) 2 )
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86 /* If any of the following are set then task stacks are filled with a known
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87 * value so the high water mark can be determined. If none of the following are
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88 * set then don't fill the stack so there is no unnecessary dependency on memset. */
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89 #if ( ( configCHECK_FOR_STACK_OVERFLOW > 1 ) || ( configUSE_TRACE_FACILITY == 1 ) || ( INCLUDE_uxTaskGetStackHighWaterMark == 1 ) || ( INCLUDE_uxTaskGetStackHighWaterMark2 == 1 ) )
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90 #define tskSET_NEW_STACKS_TO_KNOWN_VALUE 1
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92 #define tskSET_NEW_STACKS_TO_KNOWN_VALUE 0
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96 * Macros used by vListTask to indicate which state a task is in.
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98 #define tskRUNNING_CHAR ( 'X' )
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99 #define tskBLOCKED_CHAR ( 'B' )
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100 #define tskREADY_CHAR ( 'R' )
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101 #define tskDELETED_CHAR ( 'D' )
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102 #define tskSUSPENDED_CHAR ( 'S' )
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105 * Some kernel aware debuggers require the data the debugger needs access to to
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106 * be global, rather than file scope.
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108 #ifdef portREMOVE_STATIC_QUALIFIER
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112 /* The name allocated to the Idle task. This can be overridden by defining
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113 * configIDLE_TASK_NAME in FreeRTOSConfig.h. */
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114 #ifndef configIDLE_TASK_NAME
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115 #define configIDLE_TASK_NAME "IDLE"
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118 #if ( configUSE_PORT_OPTIMISED_TASK_SELECTION == 0 )
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120 /* If configUSE_PORT_OPTIMISED_TASK_SELECTION is 0 then task selection is
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121 * performed in a generic way that is not optimised to any particular
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122 * microcontroller architecture. */
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124 /* uxTopReadyPriority holds the priority of the highest priority ready
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126 #define taskRECORD_READY_PRIORITY( uxPriority ) \
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128 if( ( uxPriority ) > uxTopReadyPriority ) \
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130 uxTopReadyPriority = ( uxPriority ); \
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132 } /* taskRECORD_READY_PRIORITY */
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134 /*-----------------------------------------------------------*/
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136 #define taskSELECT_HIGHEST_PRIORITY_TASK() \
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138 UBaseType_t uxTopPriority = uxTopReadyPriority; \
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140 /* Find the highest priority queue that contains ready tasks. */ \
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141 while( listLIST_IS_EMPTY( &( pxReadyTasksLists[ uxTopPriority ] ) ) ) \
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143 configASSERT( uxTopPriority ); \
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147 /* listGET_OWNER_OF_NEXT_ENTRY indexes through the list, so the tasks of \
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148 * the same priority get an equal share of the processor time. */ \
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149 listGET_OWNER_OF_NEXT_ENTRY( pxCurrentTCB, &( pxReadyTasksLists[ uxTopPriority ] ) ); \
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150 uxTopReadyPriority = uxTopPriority; \
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151 } /* taskSELECT_HIGHEST_PRIORITY_TASK */
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153 /*-----------------------------------------------------------*/
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155 /* Define away taskRESET_READY_PRIORITY() and portRESET_READY_PRIORITY() as
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156 * they are only required when a port optimised method of task selection is
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158 #define taskRESET_READY_PRIORITY( uxPriority )
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159 #define portRESET_READY_PRIORITY( uxPriority, uxTopReadyPriority )
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161 #else /* configUSE_PORT_OPTIMISED_TASK_SELECTION */
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163 /* If configUSE_PORT_OPTIMISED_TASK_SELECTION is 1 then task selection is
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164 * performed in a way that is tailored to the particular microcontroller
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165 * architecture being used. */
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167 /* A port optimised version is provided. Call the port defined macros. */
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168 #define taskRECORD_READY_PRIORITY( uxPriority ) portRECORD_READY_PRIORITY( uxPriority, uxTopReadyPriority )
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170 /*-----------------------------------------------------------*/
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172 #define taskSELECT_HIGHEST_PRIORITY_TASK() \
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174 UBaseType_t uxTopPriority; \
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176 /* Find the highest priority list that contains ready tasks. */ \
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177 portGET_HIGHEST_PRIORITY( uxTopPriority, uxTopReadyPriority ); \
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178 configASSERT( listCURRENT_LIST_LENGTH( &( pxReadyTasksLists[ uxTopPriority ] ) ) > 0 ); \
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179 listGET_OWNER_OF_NEXT_ENTRY( pxCurrentTCB, &( pxReadyTasksLists[ uxTopPriority ] ) ); \
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180 } /* taskSELECT_HIGHEST_PRIORITY_TASK() */
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182 /*-----------------------------------------------------------*/
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184 /* A port optimised version is provided, call it only if the TCB being reset
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185 * is being referenced from a ready list. If it is referenced from a delayed
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186 * or suspended list then it won't be in a ready list. */
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187 #define taskRESET_READY_PRIORITY( uxPriority ) \
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189 if( listCURRENT_LIST_LENGTH( &( pxReadyTasksLists[ ( uxPriority ) ] ) ) == ( UBaseType_t ) 0 ) \
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191 portRESET_READY_PRIORITY( ( uxPriority ), ( uxTopReadyPriority ) ); \
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195 #endif /* configUSE_PORT_OPTIMISED_TASK_SELECTION */
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197 /*-----------------------------------------------------------*/
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199 /* pxDelayedTaskList and pxOverflowDelayedTaskList are switched when the tick
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200 * count overflows. */
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201 #define taskSWITCH_DELAYED_LISTS() \
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205 /* The delayed tasks list should be empty when the lists are switched. */ \
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206 configASSERT( ( listLIST_IS_EMPTY( pxDelayedTaskList ) ) ); \
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208 pxTemp = pxDelayedTaskList; \
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209 pxDelayedTaskList = pxOverflowDelayedTaskList; \
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210 pxOverflowDelayedTaskList = pxTemp; \
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211 xNumOfOverflows++; \
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212 prvResetNextTaskUnblockTime(); \
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215 /*-----------------------------------------------------------*/
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218 * Place the task represented by pxTCB into the appropriate ready list for
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219 * the task. It is inserted at the end of the list.
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221 #define prvAddTaskToReadyList( pxTCB ) \
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222 traceMOVED_TASK_TO_READY_STATE( pxTCB ); \
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223 taskRECORD_READY_PRIORITY( ( pxTCB )->uxPriority ); \
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224 listINSERT_END( &( pxReadyTasksLists[ ( pxTCB )->uxPriority ] ), &( ( pxTCB )->xStateListItem ) ); \
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225 tracePOST_MOVED_TASK_TO_READY_STATE( pxTCB )
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226 /*-----------------------------------------------------------*/
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229 * Several functions take a TaskHandle_t parameter that can optionally be NULL,
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230 * where NULL is used to indicate that the handle of the currently executing
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231 * task should be used in place of the parameter. This macro simply checks to
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232 * see if the parameter is NULL and returns a pointer to the appropriate TCB.
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234 #define prvGetTCBFromHandle( pxHandle ) ( ( ( pxHandle ) == NULL ) ? pxCurrentTCB : ( pxHandle ) )
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236 /* The item value of the event list item is normally used to hold the priority
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237 * of the task to which it belongs (coded to allow it to be held in reverse
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238 * priority order). However, it is occasionally borrowed for other purposes. It
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239 * is important its value is not updated due to a task priority change while it is
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240 * being used for another purpose. The following bit definition is used to inform
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241 * the scheduler that the value should not be changed - in which case it is the
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242 * responsibility of whichever module is using the value to ensure it gets set back
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243 * to its original value when it is released. */
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244 #if ( configUSE_16_BIT_TICKS == 1 )
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245 #define taskEVENT_LIST_ITEM_VALUE_IN_USE 0x8000U
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247 #define taskEVENT_LIST_ITEM_VALUE_IN_USE 0x80000000UL
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251 * Task control block. A task control block (TCB) is allocated for each task,
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252 * and stores task state information, including a pointer to the task's context
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253 * (the task's run time environment, including register values)
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255 typedef struct tskTaskControlBlock /* The old naming convention is used to prevent breaking kernel aware debuggers. */
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257 volatile StackType_t * pxTopOfStack; /*< Points to the location of the last item placed on the tasks stack. THIS MUST BE THE FIRST MEMBER OF THE TCB STRUCT. */
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259 #if ( portUSING_MPU_WRAPPERS == 1 )
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260 xMPU_SETTINGS xMPUSettings; /*< The MPU settings are defined as part of the port layer. THIS MUST BE THE SECOND MEMBER OF THE TCB STRUCT. */
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263 ListItem_t xStateListItem; /*< The list that the state list item of a task is reference from denotes the state of that task (Ready, Blocked, Suspended ). */
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264 ListItem_t xEventListItem; /*< Used to reference a task from an event list. */
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265 UBaseType_t uxPriority; /*< The priority of the task. 0 is the lowest priority. */
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266 StackType_t * pxStack; /*< Points to the start of the stack. */
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267 char pcTaskName[ configMAX_TASK_NAME_LEN ]; /*< Descriptive name given to the task when created. Facilitates debugging only. */ /*lint !e971 Unqualified char types are allowed for strings and single characters only. */
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269 #if ( ( portSTACK_GROWTH > 0 ) || ( configRECORD_STACK_HIGH_ADDRESS == 1 ) )
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270 StackType_t * pxEndOfStack; /*< Points to the highest valid address for the stack. */
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273 #if ( portCRITICAL_NESTING_IN_TCB == 1 )
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274 UBaseType_t uxCriticalNesting; /*< Holds the critical section nesting depth for ports that do not maintain their own count in the port layer. */
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277 #if ( configUSE_TRACE_FACILITY == 1 )
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278 UBaseType_t uxTCBNumber; /*< Stores a number that increments each time a TCB is created. It allows debuggers to determine when a task has been deleted and then recreated. */
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279 UBaseType_t uxTaskNumber; /*< Stores a number specifically for use by third party trace code. */
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282 #if ( configUSE_MUTEXES == 1 )
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283 UBaseType_t uxBasePriority; /*< The priority last assigned to the task - used by the priority inheritance mechanism. */
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284 UBaseType_t uxMutexesHeld;
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287 #if ( configUSE_APPLICATION_TASK_TAG == 1 )
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288 TaskHookFunction_t pxTaskTag;
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291 #if ( configNUM_THREAD_LOCAL_STORAGE_POINTERS > 0 )
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292 void * pvThreadLocalStoragePointers[ configNUM_THREAD_LOCAL_STORAGE_POINTERS ];
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295 #if ( configGENERATE_RUN_TIME_STATS == 1 )
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296 configRUN_TIME_COUNTER_TYPE ulRunTimeCounter; /*< Stores the amount of time the task has spent in the Running state. */
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299 #if ( configUSE_NEWLIB_REENTRANT == 1 )
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301 /* Allocate a Newlib reent structure that is specific to this task.
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302 * Note Newlib support has been included by popular demand, but is not
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303 * used by the FreeRTOS maintainers themselves. FreeRTOS is not
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304 * responsible for resulting newlib operation. User must be familiar with
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305 * newlib and must provide system-wide implementations of the necessary
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306 * stubs. Be warned that (at the time of writing) the current newlib design
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307 * implements a system-wide malloc() that must be provided with locks.
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309 * See the third party link http://www.nadler.com/embedded/newlibAndFreeRTOS.html
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310 * for additional information. */
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311 struct _reent xNewLib_reent;
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314 #if ( configUSE_TASK_NOTIFICATIONS == 1 )
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315 volatile uint32_t ulNotifiedValue[ configTASK_NOTIFICATION_ARRAY_ENTRIES ];
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316 volatile uint8_t ucNotifyState[ configTASK_NOTIFICATION_ARRAY_ENTRIES ];
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319 /* See the comments in FreeRTOS.h with the definition of
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320 * tskSTATIC_AND_DYNAMIC_ALLOCATION_POSSIBLE. */
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321 #if ( tskSTATIC_AND_DYNAMIC_ALLOCATION_POSSIBLE != 0 ) /*lint !e731 !e9029 Macro has been consolidated for readability reasons. */
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322 uint8_t ucStaticallyAllocated; /*< Set to pdTRUE if the task is a statically allocated to ensure no attempt is made to free the memory. */
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325 #if ( INCLUDE_xTaskAbortDelay == 1 )
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326 uint8_t ucDelayAborted;
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329 #if ( configUSE_POSIX_ERRNO == 1 )
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334 /* The old tskTCB name is maintained above then typedefed to the new TCB_t name
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335 * below to enable the use of older kernel aware debuggers. */
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336 typedef tskTCB TCB_t;
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338 /*lint -save -e956 A manual analysis and inspection has been used to determine
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339 * which static variables must be declared volatile. */
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340 portDONT_DISCARD PRIVILEGED_DATA TCB_t * volatile pxCurrentTCB = NULL;
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342 /* Lists for ready and blocked tasks. --------------------
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343 * xDelayedTaskList1 and xDelayedTaskList2 could be moved to function scope but
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344 * doing so breaks some kernel aware debuggers and debuggers that rely on removing
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345 * the static qualifier. */
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346 PRIVILEGED_DATA static List_t pxReadyTasksLists[ configMAX_PRIORITIES ]; /*< Prioritised ready tasks. */
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347 PRIVILEGED_DATA static List_t xDelayedTaskList1; /*< Delayed tasks. */
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348 PRIVILEGED_DATA static List_t xDelayedTaskList2; /*< Delayed tasks (two lists are used - one for delays that have overflowed the current tick count. */
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349 PRIVILEGED_DATA static List_t * volatile pxDelayedTaskList; /*< Points to the delayed task list currently being used. */
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350 PRIVILEGED_DATA static List_t * volatile pxOverflowDelayedTaskList; /*< Points to the delayed task list currently being used to hold tasks that have overflowed the current tick count. */
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351 PRIVILEGED_DATA static List_t xPendingReadyList; /*< Tasks that have been readied while the scheduler was suspended. They will be moved to the ready list when the scheduler is resumed. */
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353 #if ( INCLUDE_vTaskDelete == 1 )
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355 PRIVILEGED_DATA static List_t xTasksWaitingTermination; /*< Tasks that have been deleted - but their memory not yet freed. */
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356 PRIVILEGED_DATA static volatile UBaseType_t uxDeletedTasksWaitingCleanUp = ( UBaseType_t ) 0U;
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360 #if ( INCLUDE_vTaskSuspend == 1 )
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362 PRIVILEGED_DATA static List_t xSuspendedTaskList; /*< Tasks that are currently suspended. */
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366 /* Global POSIX errno. Its value is changed upon context switching to match
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367 * the errno of the currently running task. */
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368 #if ( configUSE_POSIX_ERRNO == 1 )
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369 int FreeRTOS_errno = 0;
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372 /* Other file private variables. --------------------------------*/
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373 PRIVILEGED_DATA static volatile UBaseType_t uxCurrentNumberOfTasks = ( UBaseType_t ) 0U;
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374 PRIVILEGED_DATA static volatile TickType_t xTickCount = ( TickType_t ) configINITIAL_TICK_COUNT;
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375 PRIVILEGED_DATA static volatile UBaseType_t uxTopReadyPriority = tskIDLE_PRIORITY;
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376 PRIVILEGED_DATA static volatile BaseType_t xSchedulerRunning = pdFALSE;
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377 PRIVILEGED_DATA static volatile TickType_t xPendedTicks = ( TickType_t ) 0U;
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378 PRIVILEGED_DATA static volatile BaseType_t xYieldPending = pdFALSE;
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379 PRIVILEGED_DATA static volatile BaseType_t xNumOfOverflows = ( BaseType_t ) 0;
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380 PRIVILEGED_DATA static UBaseType_t uxTaskNumber = ( UBaseType_t ) 0U;
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381 PRIVILEGED_DATA static volatile TickType_t xNextTaskUnblockTime = ( TickType_t ) 0U; /* Initialised to portMAX_DELAY before the scheduler starts. */
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382 PRIVILEGED_DATA static TaskHandle_t xIdleTaskHandle = NULL; /*< Holds the handle of the idle task. The idle task is created automatically when the scheduler is started. */
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384 /* Improve support for OpenOCD. The kernel tracks Ready tasks via priority lists.
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385 * For tracking the state of remote threads, OpenOCD uses uxTopUsedPriority
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386 * to determine the number of priority lists to read back from the remote target. */
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387 const volatile UBaseType_t uxTopUsedPriority = configMAX_PRIORITIES - 1U;
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389 /* Context switches are held pending while the scheduler is suspended. Also,
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390 * interrupts must not manipulate the xStateListItem of a TCB, or any of the
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391 * lists the xStateListItem can be referenced from, if the scheduler is suspended.
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392 * If an interrupt needs to unblock a task while the scheduler is suspended then it
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393 * moves the task's event list item into the xPendingReadyList, ready for the
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394 * kernel to move the task from the pending ready list into the real ready list
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395 * when the scheduler is unsuspended. The pending ready list itself can only be
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396 * accessed from a critical section. */
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397 PRIVILEGED_DATA static volatile UBaseType_t uxSchedulerSuspended = ( UBaseType_t ) pdFALSE;
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399 #if ( configGENERATE_RUN_TIME_STATS == 1 )
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401 /* Do not move these variables to function scope as doing so prevents the
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402 * code working with debuggers that need to remove the static qualifier. */
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403 PRIVILEGED_DATA static configRUN_TIME_COUNTER_TYPE ulTaskSwitchedInTime = 0UL; /*< Holds the value of a timer/counter the last time a task was switched in. */
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404 PRIVILEGED_DATA static volatile configRUN_TIME_COUNTER_TYPE ulTotalRunTime = 0UL; /*< Holds the total amount of execution time as defined by the run time counter clock. */
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410 /*-----------------------------------------------------------*/
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412 /* File private functions. --------------------------------*/
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415 * Utility task that simply returns pdTRUE if the task referenced by xTask is
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416 * currently in the Suspended state, or pdFALSE if the task referenced by xTask
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417 * is in any other state.
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419 #if ( INCLUDE_vTaskSuspend == 1 )
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421 static BaseType_t prvTaskIsTaskSuspended( const TaskHandle_t xTask ) PRIVILEGED_FUNCTION;
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423 #endif /* INCLUDE_vTaskSuspend */
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426 * Utility to ready all the lists used by the scheduler. This is called
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427 * automatically upon the creation of the first task.
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429 static void prvInitialiseTaskLists( void ) PRIVILEGED_FUNCTION;
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432 * The idle task, which as all tasks is implemented as a never ending loop.
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433 * The idle task is automatically created and added to the ready lists upon
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434 * creation of the first user task.
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436 * The portTASK_FUNCTION_PROTO() macro is used to allow port/compiler specific
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437 * language extensions. The equivalent prototype for this function is:
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439 * void prvIdleTask( void *pvParameters );
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442 static portTASK_FUNCTION_PROTO( prvIdleTask, pvParameters ) PRIVILEGED_FUNCTION;
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445 * Utility to free all memory allocated by the scheduler to hold a TCB,
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446 * including the stack pointed to by the TCB.
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448 * This does not free memory allocated by the task itself (i.e. memory
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449 * allocated by calls to pvPortMalloc from within the tasks application code).
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451 #if ( INCLUDE_vTaskDelete == 1 )
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453 static void prvDeleteTCB( TCB_t * pxTCB ) PRIVILEGED_FUNCTION;
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458 * Used only by the idle task. This checks to see if anything has been placed
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459 * in the list of tasks waiting to be deleted. If so the task is cleaned up
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460 * and its TCB deleted.
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462 static void prvCheckTasksWaitingTermination( void ) PRIVILEGED_FUNCTION;
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465 * The currently executing task is entering the Blocked state. Add the task to
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466 * either the current or the overflow delayed task list.
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468 static void prvAddCurrentTaskToDelayedList( TickType_t xTicksToWait,
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469 const BaseType_t xCanBlockIndefinitely ) PRIVILEGED_FUNCTION;
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472 * Fills an TaskStatus_t structure with information on each task that is
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473 * referenced from the pxList list (which may be a ready list, a delayed list,
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474 * a suspended list, etc.).
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476 * THIS FUNCTION IS INTENDED FOR DEBUGGING ONLY, AND SHOULD NOT BE CALLED FROM
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477 * NORMAL APPLICATION CODE.
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479 #if ( configUSE_TRACE_FACILITY == 1 )
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481 static UBaseType_t prvListTasksWithinSingleList( TaskStatus_t * pxTaskStatusArray,
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483 eTaskState eState ) PRIVILEGED_FUNCTION;
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488 * Searches pxList for a task with name pcNameToQuery - returning a handle to
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489 * the task if it is found, or NULL if the task is not found.
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491 #if ( INCLUDE_xTaskGetHandle == 1 )
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493 static TCB_t * prvSearchForNameWithinSingleList( List_t * pxList,
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494 const char pcNameToQuery[] ) PRIVILEGED_FUNCTION;
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499 * When a task is created, the stack of the task is filled with a known value.
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500 * This function determines the 'high water mark' of the task stack by
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501 * determining how much of the stack remains at the original preset value.
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503 #if ( ( configUSE_TRACE_FACILITY == 1 ) || ( INCLUDE_uxTaskGetStackHighWaterMark == 1 ) || ( INCLUDE_uxTaskGetStackHighWaterMark2 == 1 ) )
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505 static configSTACK_DEPTH_TYPE prvTaskCheckFreeStackSpace( const uint8_t * pucStackByte ) PRIVILEGED_FUNCTION;
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510 * Return the amount of time, in ticks, that will pass before the kernel will
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511 * next move a task from the Blocked state to the Running state.
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513 * This conditional compilation should use inequality to 0, not equality to 1.
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514 * This is to ensure portSUPPRESS_TICKS_AND_SLEEP() can be called when user
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515 * defined low power mode implementations require configUSE_TICKLESS_IDLE to be
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516 * set to a value other than 1.
\r
518 #if ( configUSE_TICKLESS_IDLE != 0 )
\r
520 static TickType_t prvGetExpectedIdleTime( void ) PRIVILEGED_FUNCTION;
\r
525 * Set xNextTaskUnblockTime to the time at which the next Blocked state task
\r
526 * will exit the Blocked state.
\r
528 static void prvResetNextTaskUnblockTime( void ) PRIVILEGED_FUNCTION;
\r
530 #if ( ( ( configUSE_TRACE_FACILITY == 1 ) || ( configGENERATE_RUN_TIME_STATS == 1 ) ) && \
\r
531 ( configUSE_STATS_FORMATTING_FUNCTIONS > 0 ) && \
\r
532 ( configSUPPORT_DYNAMIC_ALLOCATION == 1 ) )
\r
535 * Helper function used to pad task names with spaces when printing out
\r
536 * human readable tables of task information.
\r
538 static char * prvWriteNameToBuffer( char * pcBuffer,
\r
539 const char * pcTaskName ) PRIVILEGED_FUNCTION;
\r
544 * Called after a Task_t structure has been allocated either statically or
\r
545 * dynamically to fill in the structure's members.
\r
547 static void prvInitialiseNewTask( TaskFunction_t pxTaskCode,
\r
548 const char * const pcName, /*lint !e971 Unqualified char types are allowed for strings and single characters only. */
\r
549 const uint32_t ulStackDepth,
\r
550 void * const pvParameters,
\r
551 UBaseType_t uxPriority,
\r
552 TaskHandle_t * const pxCreatedTask,
\r
554 const MemoryRegion_t * const xRegions ) PRIVILEGED_FUNCTION;
\r
557 * Called after a new task has been created and initialised to place the task
\r
558 * under the control of the scheduler.
\r
560 static void prvAddNewTaskToReadyList( TCB_t * pxNewTCB ) PRIVILEGED_FUNCTION;
\r
563 * freertos_tasks_c_additions_init() should only be called if the user definable
\r
564 * macro FREERTOS_TASKS_C_ADDITIONS_INIT() is defined, as that is the only macro
\r
565 * called by the function.
\r
567 #ifdef FREERTOS_TASKS_C_ADDITIONS_INIT
\r
569 static void freertos_tasks_c_additions_init( void ) PRIVILEGED_FUNCTION;
\r
573 /*-----------------------------------------------------------*/
\r
575 #if ( configSUPPORT_STATIC_ALLOCATION == 1 )
\r
577 TaskHandle_t xTaskCreateStatic( TaskFunction_t pxTaskCode,
\r
578 const char * const pcName, /*lint !e971 Unqualified char types are allowed for strings and single characters only. */
\r
579 const uint32_t ulStackDepth,
\r
580 void * const pvParameters,
\r
581 UBaseType_t uxPriority,
\r
582 StackType_t * const puxStackBuffer,
\r
583 StaticTask_t * const pxTaskBuffer )
\r
586 TaskHandle_t xReturn;
\r
588 configASSERT( puxStackBuffer != NULL );
\r
589 configASSERT( pxTaskBuffer != NULL );
\r
591 #if ( configASSERT_DEFINED == 1 )
\r
593 /* Sanity check that the size of the structure used to declare a
\r
594 * variable of type StaticTask_t equals the size of the real task
\r
596 volatile size_t xSize = sizeof( StaticTask_t );
\r
597 configASSERT( xSize == sizeof( TCB_t ) );
\r
598 ( void ) xSize; /* Prevent lint warning when configASSERT() is not used. */
\r
600 #endif /* configASSERT_DEFINED */
\r
602 if( ( pxTaskBuffer != NULL ) && ( puxStackBuffer != NULL ) )
\r
604 /* The memory used for the task's TCB and stack are passed into this
\r
605 * function - use them. */
\r
606 pxNewTCB = ( TCB_t * ) pxTaskBuffer; /*lint !e740 !e9087 Unusual cast is ok as the structures are designed to have the same alignment, and the size is checked by an assert. */
\r
607 memset( ( void * ) pxNewTCB, 0x00, sizeof( TCB_t ) );
\r
608 pxNewTCB->pxStack = ( StackType_t * ) puxStackBuffer;
\r
610 #if ( tskSTATIC_AND_DYNAMIC_ALLOCATION_POSSIBLE != 0 ) /*lint !e731 !e9029 Macro has been consolidated for readability reasons. */
\r
612 /* Tasks can be created statically or dynamically, so note this
\r
613 * task was created statically in case the task is later deleted. */
\r
614 pxNewTCB->ucStaticallyAllocated = tskSTATICALLY_ALLOCATED_STACK_AND_TCB;
\r
616 #endif /* tskSTATIC_AND_DYNAMIC_ALLOCATION_POSSIBLE */
\r
618 prvInitialiseNewTask( pxTaskCode, pcName, ulStackDepth, pvParameters, uxPriority, &xReturn, pxNewTCB, NULL );
\r
619 prvAddNewTaskToReadyList( pxNewTCB );
\r
629 #endif /* SUPPORT_STATIC_ALLOCATION */
\r
630 /*-----------------------------------------------------------*/
\r
632 #if ( ( portUSING_MPU_WRAPPERS == 1 ) && ( configSUPPORT_STATIC_ALLOCATION == 1 ) )
\r
634 BaseType_t xTaskCreateRestrictedStatic( const TaskParameters_t * const pxTaskDefinition,
\r
635 TaskHandle_t * pxCreatedTask )
\r
638 BaseType_t xReturn = errCOULD_NOT_ALLOCATE_REQUIRED_MEMORY;
\r
640 configASSERT( pxTaskDefinition->puxStackBuffer != NULL );
\r
641 configASSERT( pxTaskDefinition->pxTaskBuffer != NULL );
\r
643 if( ( pxTaskDefinition->puxStackBuffer != NULL ) && ( pxTaskDefinition->pxTaskBuffer != NULL ) )
\r
645 /* Allocate space for the TCB. Where the memory comes from depends
\r
646 * on the implementation of the port malloc function and whether or
\r
647 * not static allocation is being used. */
\r
648 pxNewTCB = ( TCB_t * ) pxTaskDefinition->pxTaskBuffer;
\r
649 memset( ( void * ) pxNewTCB, 0x00, sizeof( TCB_t ) );
\r
651 /* Store the stack location in the TCB. */
\r
652 pxNewTCB->pxStack = pxTaskDefinition->puxStackBuffer;
\r
654 #if ( tskSTATIC_AND_DYNAMIC_ALLOCATION_POSSIBLE != 0 )
\r
656 /* Tasks can be created statically or dynamically, so note this
\r
657 * task was created statically in case the task is later deleted. */
\r
658 pxNewTCB->ucStaticallyAllocated = tskSTATICALLY_ALLOCATED_STACK_AND_TCB;
\r
660 #endif /* tskSTATIC_AND_DYNAMIC_ALLOCATION_POSSIBLE */
\r
662 prvInitialiseNewTask( pxTaskDefinition->pvTaskCode,
\r
663 pxTaskDefinition->pcName,
\r
664 ( uint32_t ) pxTaskDefinition->usStackDepth,
\r
665 pxTaskDefinition->pvParameters,
\r
666 pxTaskDefinition->uxPriority,
\r
667 pxCreatedTask, pxNewTCB,
\r
668 pxTaskDefinition->xRegions );
\r
670 prvAddNewTaskToReadyList( pxNewTCB );
\r
677 #endif /* ( portUSING_MPU_WRAPPERS == 1 ) && ( configSUPPORT_STATIC_ALLOCATION == 1 ) */
\r
678 /*-----------------------------------------------------------*/
\r
680 #if ( ( portUSING_MPU_WRAPPERS == 1 ) && ( configSUPPORT_DYNAMIC_ALLOCATION == 1 ) )
\r
682 BaseType_t xTaskCreateRestricted( const TaskParameters_t * const pxTaskDefinition,
\r
683 TaskHandle_t * pxCreatedTask )
\r
686 BaseType_t xReturn = errCOULD_NOT_ALLOCATE_REQUIRED_MEMORY;
\r
688 configASSERT( pxTaskDefinition->puxStackBuffer );
\r
690 if( pxTaskDefinition->puxStackBuffer != NULL )
\r
692 /* Allocate space for the TCB. Where the memory comes from depends
\r
693 * on the implementation of the port malloc function and whether or
\r
694 * not static allocation is being used. */
\r
695 pxNewTCB = ( TCB_t * ) pvPortMalloc( sizeof( TCB_t ) );
\r
697 if( pxNewTCB != NULL )
\r
699 memset( ( void * ) pxNewTCB, 0x00, sizeof( TCB_t ) );
\r
701 /* Store the stack location in the TCB. */
\r
702 pxNewTCB->pxStack = pxTaskDefinition->puxStackBuffer;
\r
704 #if ( tskSTATIC_AND_DYNAMIC_ALLOCATION_POSSIBLE != 0 )
\r
706 /* Tasks can be created statically or dynamically, so note
\r
707 * this task had a statically allocated stack in case it is
\r
708 * later deleted. The TCB was allocated dynamically. */
\r
709 pxNewTCB->ucStaticallyAllocated = tskSTATICALLY_ALLOCATED_STACK_ONLY;
\r
711 #endif /* tskSTATIC_AND_DYNAMIC_ALLOCATION_POSSIBLE */
\r
713 prvInitialiseNewTask( pxTaskDefinition->pvTaskCode,
\r
714 pxTaskDefinition->pcName,
\r
715 ( uint32_t ) pxTaskDefinition->usStackDepth,
\r
716 pxTaskDefinition->pvParameters,
\r
717 pxTaskDefinition->uxPriority,
\r
718 pxCreatedTask, pxNewTCB,
\r
719 pxTaskDefinition->xRegions );
\r
721 prvAddNewTaskToReadyList( pxNewTCB );
\r
729 #endif /* portUSING_MPU_WRAPPERS */
\r
730 /*-----------------------------------------------------------*/
\r
732 #if ( configSUPPORT_DYNAMIC_ALLOCATION == 1 )
\r
734 BaseType_t xTaskCreate( TaskFunction_t pxTaskCode,
\r
735 const char * const pcName, /*lint !e971 Unqualified char types are allowed for strings and single characters only. */
\r
736 const configSTACK_DEPTH_TYPE usStackDepth,
\r
737 void * const pvParameters,
\r
738 UBaseType_t uxPriority,
\r
739 TaskHandle_t * const pxCreatedTask )
\r
742 BaseType_t xReturn;
\r
744 /* If the stack grows down then allocate the stack then the TCB so the stack
\r
745 * does not grow into the TCB. Likewise if the stack grows up then allocate
\r
746 * the TCB then the stack. */
\r
747 #if ( portSTACK_GROWTH > 0 )
\r
749 /* Allocate space for the TCB. Where the memory comes from depends on
\r
750 * the implementation of the port malloc function and whether or not static
\r
751 * allocation is being used. */
\r
752 pxNewTCB = ( TCB_t * ) pvPortMalloc( sizeof( TCB_t ) );
\r
754 if( pxNewTCB != NULL )
\r
756 memset( ( void * ) pxNewTCB, 0x00, sizeof( TCB_t ) );
\r
758 /* Allocate space for the stack used by the task being created.
\r
759 * The base of the stack memory stored in the TCB so the task can
\r
760 * be deleted later if required. */
\r
761 pxNewTCB->pxStack = ( StackType_t * ) pvPortMallocStack( ( ( ( size_t ) usStackDepth ) * sizeof( StackType_t ) ) ); /*lint !e961 MISRA exception as the casts are only redundant for some ports. */
\r
763 if( pxNewTCB->pxStack == NULL )
\r
765 /* Could not allocate the stack. Delete the allocated TCB. */
\r
766 vPortFree( pxNewTCB );
\r
771 #else /* portSTACK_GROWTH */
\r
773 StackType_t * pxStack;
\r
775 /* Allocate space for the stack used by the task being created. */
\r
776 pxStack = pvPortMallocStack( ( ( ( size_t ) usStackDepth ) * sizeof( StackType_t ) ) ); /*lint !e9079 All values returned by pvPortMalloc() have at least the alignment required by the MCU's stack and this allocation is the stack. */
\r
778 if( pxStack != NULL )
\r
780 /* Allocate space for the TCB. */
\r
781 pxNewTCB = ( TCB_t * ) pvPortMalloc( sizeof( TCB_t ) ); /*lint !e9087 !e9079 All values returned by pvPortMalloc() have at least the alignment required by the MCU's stack, and the first member of TCB_t is always a pointer to the task's stack. */
\r
783 if( pxNewTCB != NULL )
\r
785 memset( ( void * ) pxNewTCB, 0x00, sizeof( TCB_t ) );
\r
787 /* Store the stack location in the TCB. */
\r
788 pxNewTCB->pxStack = pxStack;
\r
792 /* The stack cannot be used as the TCB was not created. Free
\r
794 vPortFreeStack( pxStack );
\r
802 #endif /* portSTACK_GROWTH */
\r
804 if( pxNewTCB != NULL )
\r
806 #if ( tskSTATIC_AND_DYNAMIC_ALLOCATION_POSSIBLE != 0 ) /*lint !e9029 !e731 Macro has been consolidated for readability reasons. */
\r
808 /* Tasks can be created statically or dynamically, so note this
\r
809 * task was created dynamically in case it is later deleted. */
\r
810 pxNewTCB->ucStaticallyAllocated = tskDYNAMICALLY_ALLOCATED_STACK_AND_TCB;
\r
812 #endif /* tskSTATIC_AND_DYNAMIC_ALLOCATION_POSSIBLE */
\r
814 prvInitialiseNewTask( pxTaskCode, pcName, ( uint32_t ) usStackDepth, pvParameters, uxPriority, pxCreatedTask, pxNewTCB, NULL );
\r
815 prvAddNewTaskToReadyList( pxNewTCB );
\r
820 xReturn = errCOULD_NOT_ALLOCATE_REQUIRED_MEMORY;
\r
826 #endif /* configSUPPORT_DYNAMIC_ALLOCATION */
\r
827 /*-----------------------------------------------------------*/
\r
829 static void prvInitialiseNewTask( TaskFunction_t pxTaskCode,
\r
830 const char * const pcName, /*lint !e971 Unqualified char types are allowed for strings and single characters only. */
\r
831 const uint32_t ulStackDepth,
\r
832 void * const pvParameters,
\r
833 UBaseType_t uxPriority,
\r
834 TaskHandle_t * const pxCreatedTask,
\r
836 const MemoryRegion_t * const xRegions )
\r
838 StackType_t * pxTopOfStack;
\r
841 #if ( portUSING_MPU_WRAPPERS == 1 )
\r
842 /* Should the task be created in privileged mode? */
\r
843 BaseType_t xRunPrivileged;
\r
845 if( ( uxPriority & portPRIVILEGE_BIT ) != 0U )
\r
847 xRunPrivileged = pdTRUE;
\r
851 xRunPrivileged = pdFALSE;
\r
853 uxPriority &= ~portPRIVILEGE_BIT;
\r
854 #endif /* portUSING_MPU_WRAPPERS == 1 */
\r
856 /* Avoid dependency on memset() if it is not required. */
\r
857 #if ( tskSET_NEW_STACKS_TO_KNOWN_VALUE == 1 )
\r
859 /* Fill the stack with a known value to assist debugging. */
\r
860 ( void ) memset( pxNewTCB->pxStack, ( int ) tskSTACK_FILL_BYTE, ( size_t ) ulStackDepth * sizeof( StackType_t ) );
\r
862 #endif /* tskSET_NEW_STACKS_TO_KNOWN_VALUE */
\r
864 /* Calculate the top of stack address. This depends on whether the stack
\r
865 * grows from high memory to low (as per the 80x86) or vice versa.
\r
866 * portSTACK_GROWTH is used to make the result positive or negative as required
\r
868 #if ( portSTACK_GROWTH < 0 )
\r
870 pxTopOfStack = &( pxNewTCB->pxStack[ ulStackDepth - ( uint32_t ) 1 ] );
\r
871 pxTopOfStack = ( StackType_t * ) ( ( ( portPOINTER_SIZE_TYPE ) pxTopOfStack ) & ( ~( ( portPOINTER_SIZE_TYPE ) portBYTE_ALIGNMENT_MASK ) ) ); /*lint !e923 !e9033 !e9078 MISRA exception. Avoiding casts between pointers and integers is not practical. Size differences accounted for using portPOINTER_SIZE_TYPE type. Checked by assert(). */
\r
873 /* Check the alignment of the calculated top of stack is correct. */
\r
874 configASSERT( ( ( ( portPOINTER_SIZE_TYPE ) pxTopOfStack & ( portPOINTER_SIZE_TYPE ) portBYTE_ALIGNMENT_MASK ) == 0UL ) );
\r
876 #if ( configRECORD_STACK_HIGH_ADDRESS == 1 )
\r
878 /* Also record the stack's high address, which may assist
\r
880 pxNewTCB->pxEndOfStack = pxTopOfStack;
\r
882 #endif /* configRECORD_STACK_HIGH_ADDRESS */
\r
884 #else /* portSTACK_GROWTH */
\r
886 pxTopOfStack = pxNewTCB->pxStack;
\r
888 /* Check the alignment of the stack buffer is correct. */
\r
889 configASSERT( ( ( ( portPOINTER_SIZE_TYPE ) pxNewTCB->pxStack & ( portPOINTER_SIZE_TYPE ) portBYTE_ALIGNMENT_MASK ) == 0UL ) );
\r
891 /* The other extreme of the stack space is required if stack checking is
\r
893 pxNewTCB->pxEndOfStack = pxNewTCB->pxStack + ( ulStackDepth - ( uint32_t ) 1 );
\r
895 #endif /* portSTACK_GROWTH */
\r
897 /* Store the task name in the TCB. */
\r
898 if( pcName != NULL )
\r
900 for( x = ( UBaseType_t ) 0; x < ( UBaseType_t ) configMAX_TASK_NAME_LEN; x++ )
\r
902 pxNewTCB->pcTaskName[ x ] = pcName[ x ];
\r
904 /* Don't copy all configMAX_TASK_NAME_LEN if the string is shorter than
\r
905 * configMAX_TASK_NAME_LEN characters just in case the memory after the
\r
906 * string is not accessible (extremely unlikely). */
\r
907 if( pcName[ x ] == ( char ) 0x00 )
\r
913 mtCOVERAGE_TEST_MARKER();
\r
917 /* Ensure the name string is terminated in the case that the string length
\r
918 * was greater or equal to configMAX_TASK_NAME_LEN. */
\r
919 pxNewTCB->pcTaskName[ configMAX_TASK_NAME_LEN - 1 ] = '\0';
\r
923 mtCOVERAGE_TEST_MARKER();
\r
926 /* This is used as an array index so must ensure it's not too large. */
\r
927 configASSERT( uxPriority < configMAX_PRIORITIES );
\r
929 if( uxPriority >= ( UBaseType_t ) configMAX_PRIORITIES )
\r
931 uxPriority = ( UBaseType_t ) configMAX_PRIORITIES - ( UBaseType_t ) 1U;
\r
935 mtCOVERAGE_TEST_MARKER();
\r
938 pxNewTCB->uxPriority = uxPriority;
\r
939 #if ( configUSE_MUTEXES == 1 )
\r
941 pxNewTCB->uxBasePriority = uxPriority;
\r
943 #endif /* configUSE_MUTEXES */
\r
945 vListInitialiseItem( &( pxNewTCB->xStateListItem ) );
\r
946 vListInitialiseItem( &( pxNewTCB->xEventListItem ) );
\r
948 /* Set the pxNewTCB as a link back from the ListItem_t. This is so we can get
\r
949 * back to the containing TCB from a generic item in a list. */
\r
950 listSET_LIST_ITEM_OWNER( &( pxNewTCB->xStateListItem ), pxNewTCB );
\r
952 /* Event lists are always in priority order. */
\r
953 listSET_LIST_ITEM_VALUE( &( pxNewTCB->xEventListItem ), ( TickType_t ) configMAX_PRIORITIES - ( TickType_t ) uxPriority ); /*lint !e961 MISRA exception as the casts are only redundant for some ports. */
\r
954 listSET_LIST_ITEM_OWNER( &( pxNewTCB->xEventListItem ), pxNewTCB );
\r
956 #if ( portUSING_MPU_WRAPPERS == 1 )
\r
958 vPortStoreTaskMPUSettings( &( pxNewTCB->xMPUSettings ), xRegions, pxNewTCB->pxStack, ulStackDepth );
\r
962 /* Avoid compiler warning about unreferenced parameter. */
\r
967 #if ( configUSE_NEWLIB_REENTRANT == 1 )
\r
969 /* Initialise this task's Newlib reent structure.
\r
970 * See the third party link http://www.nadler.com/embedded/newlibAndFreeRTOS.html
\r
971 * for additional information. */
\r
972 _REENT_INIT_PTR( ( &( pxNewTCB->xNewLib_reent ) ) );
\r
976 /* Initialize the TCB stack to look as if the task was already running,
\r
977 * but had been interrupted by the scheduler. The return address is set
\r
978 * to the start of the task function. Once the stack has been initialised
\r
979 * the top of stack variable is updated. */
\r
980 #if ( portUSING_MPU_WRAPPERS == 1 )
\r
982 /* If the port has capability to detect stack overflow,
\r
983 * pass the stack end address to the stack initialization
\r
984 * function as well. */
\r
985 #if ( portHAS_STACK_OVERFLOW_CHECKING == 1 )
\r
987 #if ( portSTACK_GROWTH < 0 )
\r
989 pxNewTCB->pxTopOfStack = pxPortInitialiseStack( pxTopOfStack, pxNewTCB->pxStack, pxTaskCode, pvParameters, xRunPrivileged );
\r
991 #else /* portSTACK_GROWTH */
\r
993 pxNewTCB->pxTopOfStack = pxPortInitialiseStack( pxTopOfStack, pxNewTCB->pxEndOfStack, pxTaskCode, pvParameters, xRunPrivileged );
\r
995 #endif /* portSTACK_GROWTH */
\r
997 #else /* portHAS_STACK_OVERFLOW_CHECKING */
\r
999 pxNewTCB->pxTopOfStack = pxPortInitialiseStack( pxTopOfStack, pxTaskCode, pvParameters, xRunPrivileged );
\r
1001 #endif /* portHAS_STACK_OVERFLOW_CHECKING */
\r
1003 #else /* portUSING_MPU_WRAPPERS */
\r
1005 /* If the port has capability to detect stack overflow,
\r
1006 * pass the stack end address to the stack initialization
\r
1007 * function as well. */
\r
1008 #if ( portHAS_STACK_OVERFLOW_CHECKING == 1 )
\r
1010 #if ( portSTACK_GROWTH < 0 )
\r
1012 pxNewTCB->pxTopOfStack = pxPortInitialiseStack( pxTopOfStack, pxNewTCB->pxStack, pxTaskCode, pvParameters );
\r
1014 #else /* portSTACK_GROWTH */
\r
1016 pxNewTCB->pxTopOfStack = pxPortInitialiseStack( pxTopOfStack, pxNewTCB->pxEndOfStack, pxTaskCode, pvParameters );
\r
1018 #endif /* portSTACK_GROWTH */
\r
1020 #else /* portHAS_STACK_OVERFLOW_CHECKING */
\r
1022 pxNewTCB->pxTopOfStack = pxPortInitialiseStack( pxTopOfStack, pxTaskCode, pvParameters );
\r
1024 #endif /* portHAS_STACK_OVERFLOW_CHECKING */
\r
1026 #endif /* portUSING_MPU_WRAPPERS */
\r
1028 if( pxCreatedTask != NULL )
\r
1030 /* Pass the handle out in an anonymous way. The handle can be used to
\r
1031 * change the created task's priority, delete the created task, etc.*/
\r
1032 *pxCreatedTask = ( TaskHandle_t ) pxNewTCB;
\r
1036 mtCOVERAGE_TEST_MARKER();
\r
1039 /*-----------------------------------------------------------*/
\r
1041 static void prvAddNewTaskToReadyList( TCB_t * pxNewTCB )
\r
1043 /* Ensure interrupts don't access the task lists while the lists are being
\r
1045 taskENTER_CRITICAL();
\r
1047 uxCurrentNumberOfTasks++;
\r
1049 if( pxCurrentTCB == NULL )
\r
1051 /* There are no other tasks, or all the other tasks are in
\r
1052 * the suspended state - make this the current task. */
\r
1053 pxCurrentTCB = pxNewTCB;
\r
1055 if( uxCurrentNumberOfTasks == ( UBaseType_t ) 1 )
\r
1057 /* This is the first task to be created so do the preliminary
\r
1058 * initialisation required. We will not recover if this call
\r
1059 * fails, but we will report the failure. */
\r
1060 prvInitialiseTaskLists();
\r
1064 mtCOVERAGE_TEST_MARKER();
\r
1069 /* If the scheduler is not already running, make this task the
\r
1070 * current task if it is the highest priority task to be created
\r
1072 if( xSchedulerRunning == pdFALSE )
\r
1074 if( pxCurrentTCB->uxPriority <= pxNewTCB->uxPriority )
\r
1076 pxCurrentTCB = pxNewTCB;
\r
1080 mtCOVERAGE_TEST_MARKER();
\r
1085 mtCOVERAGE_TEST_MARKER();
\r
1091 #if ( configUSE_TRACE_FACILITY == 1 )
\r
1093 /* Add a counter into the TCB for tracing only. */
\r
1094 pxNewTCB->uxTCBNumber = uxTaskNumber;
\r
1096 #endif /* configUSE_TRACE_FACILITY */
\r
1097 traceTASK_CREATE( pxNewTCB );
\r
1099 prvAddTaskToReadyList( pxNewTCB );
\r
1101 portSETUP_TCB( pxNewTCB );
\r
1103 taskEXIT_CRITICAL();
\r
1105 if( xSchedulerRunning != pdFALSE )
\r
1107 /* If the created task is of a higher priority than the current task
\r
1108 * then it should run now. */
\r
1109 if( pxCurrentTCB->uxPriority < pxNewTCB->uxPriority )
\r
1111 taskYIELD_IF_USING_PREEMPTION();
\r
1115 mtCOVERAGE_TEST_MARKER();
\r
1120 mtCOVERAGE_TEST_MARKER();
\r
1123 /*-----------------------------------------------------------*/
\r
1125 #if ( INCLUDE_vTaskDelete == 1 )
\r
1127 void vTaskDelete( TaskHandle_t xTaskToDelete )
\r
1131 taskENTER_CRITICAL();
\r
1133 /* If null is passed in here then it is the calling task that is
\r
1134 * being deleted. */
\r
1135 pxTCB = prvGetTCBFromHandle( xTaskToDelete );
\r
1137 /* Remove task from the ready/delayed list. */
\r
1138 if( uxListRemove( &( pxTCB->xStateListItem ) ) == ( UBaseType_t ) 0 )
\r
1140 taskRESET_READY_PRIORITY( pxTCB->uxPriority );
\r
1144 mtCOVERAGE_TEST_MARKER();
\r
1147 /* Is the task waiting on an event also? */
\r
1148 if( listLIST_ITEM_CONTAINER( &( pxTCB->xEventListItem ) ) != NULL )
\r
1150 ( void ) uxListRemove( &( pxTCB->xEventListItem ) );
\r
1154 mtCOVERAGE_TEST_MARKER();
\r
1157 /* Increment the uxTaskNumber also so kernel aware debuggers can
\r
1158 * detect that the task lists need re-generating. This is done before
\r
1159 * portPRE_TASK_DELETE_HOOK() as in the Windows port that macro will
\r
1163 if( pxTCB == pxCurrentTCB )
\r
1165 /* A task is deleting itself. This cannot complete within the
\r
1166 * task itself, as a context switch to another task is required.
\r
1167 * Place the task in the termination list. The idle task will
\r
1168 * check the termination list and free up any memory allocated by
\r
1169 * the scheduler for the TCB and stack of the deleted task. */
\r
1170 vListInsertEnd( &xTasksWaitingTermination, &( pxTCB->xStateListItem ) );
\r
1172 /* Increment the ucTasksDeleted variable so the idle task knows
\r
1173 * there is a task that has been deleted and that it should therefore
\r
1174 * check the xTasksWaitingTermination list. */
\r
1175 ++uxDeletedTasksWaitingCleanUp;
\r
1177 /* Call the delete hook before portPRE_TASK_DELETE_HOOK() as
\r
1178 * portPRE_TASK_DELETE_HOOK() does not return in the Win32 port. */
\r
1179 traceTASK_DELETE( pxTCB );
\r
1181 /* The pre-delete hook is primarily for the Windows simulator,
\r
1182 * in which Windows specific clean up operations are performed,
\r
1183 * after which it is not possible to yield away from this task -
\r
1184 * hence xYieldPending is used to latch that a context switch is
\r
1186 portPRE_TASK_DELETE_HOOK( pxTCB, &xYieldPending );
\r
1190 --uxCurrentNumberOfTasks;
\r
1191 traceTASK_DELETE( pxTCB );
\r
1193 /* Reset the next expected unblock time in case it referred to
\r
1194 * the task that has just been deleted. */
\r
1195 prvResetNextTaskUnblockTime();
\r
1198 taskEXIT_CRITICAL();
\r
1200 /* If the task is not deleting itself, call prvDeleteTCB from outside of
\r
1201 * critical section. If a task deletes itself, prvDeleteTCB is called
\r
1202 * from prvCheckTasksWaitingTermination which is called from Idle task. */
\r
1203 if( pxTCB != pxCurrentTCB )
\r
1205 prvDeleteTCB( pxTCB );
\r
1208 /* Force a reschedule if it is the currently running task that has just
\r
1209 * been deleted. */
\r
1210 if( xSchedulerRunning != pdFALSE )
\r
1212 if( pxTCB == pxCurrentTCB )
\r
1214 configASSERT( uxSchedulerSuspended == 0 );
\r
1215 portYIELD_WITHIN_API();
\r
1219 mtCOVERAGE_TEST_MARKER();
\r
1224 #endif /* INCLUDE_vTaskDelete */
\r
1225 /*-----------------------------------------------------------*/
\r
1227 #if ( INCLUDE_xTaskDelayUntil == 1 )
\r
1229 BaseType_t xTaskDelayUntil( TickType_t * const pxPreviousWakeTime,
\r
1230 const TickType_t xTimeIncrement )
\r
1232 TickType_t xTimeToWake;
\r
1233 BaseType_t xAlreadyYielded, xShouldDelay = pdFALSE;
\r
1235 configASSERT( pxPreviousWakeTime );
\r
1236 configASSERT( ( xTimeIncrement > 0U ) );
\r
1237 configASSERT( uxSchedulerSuspended == 0 );
\r
1239 vTaskSuspendAll();
\r
1241 /* Minor optimisation. The tick count cannot change in this
\r
1243 const TickType_t xConstTickCount = xTickCount;
\r
1245 /* Generate the tick time at which the task wants to wake. */
\r
1246 xTimeToWake = *pxPreviousWakeTime + xTimeIncrement;
\r
1248 if( xConstTickCount < *pxPreviousWakeTime )
\r
1250 /* The tick count has overflowed since this function was
\r
1251 * lasted called. In this case the only time we should ever
\r
1252 * actually delay is if the wake time has also overflowed,
\r
1253 * and the wake time is greater than the tick time. When this
\r
1254 * is the case it is as if neither time had overflowed. */
\r
1255 if( ( xTimeToWake < *pxPreviousWakeTime ) && ( xTimeToWake > xConstTickCount ) )
\r
1257 xShouldDelay = pdTRUE;
\r
1261 mtCOVERAGE_TEST_MARKER();
\r
1266 /* The tick time has not overflowed. In this case we will
\r
1267 * delay if either the wake time has overflowed, and/or the
\r
1268 * tick time is less than the wake time. */
\r
1269 if( ( xTimeToWake < *pxPreviousWakeTime ) || ( xTimeToWake > xConstTickCount ) )
\r
1271 xShouldDelay = pdTRUE;
\r
1275 mtCOVERAGE_TEST_MARKER();
\r
1279 /* Update the wake time ready for the next call. */
\r
1280 *pxPreviousWakeTime = xTimeToWake;
\r
1282 if( xShouldDelay != pdFALSE )
\r
1284 traceTASK_DELAY_UNTIL( xTimeToWake );
\r
1286 /* prvAddCurrentTaskToDelayedList() needs the block time, not
\r
1287 * the time to wake, so subtract the current tick count. */
\r
1288 prvAddCurrentTaskToDelayedList( xTimeToWake - xConstTickCount, pdFALSE );
\r
1292 mtCOVERAGE_TEST_MARKER();
\r
1295 xAlreadyYielded = xTaskResumeAll();
\r
1297 /* Force a reschedule if xTaskResumeAll has not already done so, we may
\r
1298 * have put ourselves to sleep. */
\r
1299 if( xAlreadyYielded == pdFALSE )
\r
1301 portYIELD_WITHIN_API();
\r
1305 mtCOVERAGE_TEST_MARKER();
\r
1308 return xShouldDelay;
\r
1311 #endif /* INCLUDE_xTaskDelayUntil */
\r
1312 /*-----------------------------------------------------------*/
\r
1314 #if ( INCLUDE_vTaskDelay == 1 )
\r
1316 void vTaskDelay( const TickType_t xTicksToDelay )
\r
1318 BaseType_t xAlreadyYielded = pdFALSE;
\r
1320 /* A delay time of zero just forces a reschedule. */
\r
1321 if( xTicksToDelay > ( TickType_t ) 0U )
\r
1323 configASSERT( uxSchedulerSuspended == 0 );
\r
1324 vTaskSuspendAll();
\r
1326 traceTASK_DELAY();
\r
1328 /* A task that is removed from the event list while the
\r
1329 * scheduler is suspended will not get placed in the ready
\r
1330 * list or removed from the blocked list until the scheduler
\r
1333 * This task cannot be in an event list as it is the currently
\r
1334 * executing task. */
\r
1335 prvAddCurrentTaskToDelayedList( xTicksToDelay, pdFALSE );
\r
1337 xAlreadyYielded = xTaskResumeAll();
\r
1341 mtCOVERAGE_TEST_MARKER();
\r
1344 /* Force a reschedule if xTaskResumeAll has not already done so, we may
\r
1345 * have put ourselves to sleep. */
\r
1346 if( xAlreadyYielded == pdFALSE )
\r
1348 portYIELD_WITHIN_API();
\r
1352 mtCOVERAGE_TEST_MARKER();
\r
1356 #endif /* INCLUDE_vTaskDelay */
\r
1357 /*-----------------------------------------------------------*/
\r
1359 #if ( ( INCLUDE_eTaskGetState == 1 ) || ( configUSE_TRACE_FACILITY == 1 ) || ( INCLUDE_xTaskAbortDelay == 1 ) )
\r
1361 eTaskState eTaskGetState( TaskHandle_t xTask )
\r
1363 eTaskState eReturn;
\r
1364 List_t const * pxStateList, * pxDelayedList, * pxOverflowedDelayedList;
\r
1365 const TCB_t * const pxTCB = xTask;
\r
1367 configASSERT( pxTCB );
\r
1369 if( pxTCB == pxCurrentTCB )
\r
1371 /* The task calling this function is querying its own state. */
\r
1372 eReturn = eRunning;
\r
1376 taskENTER_CRITICAL();
\r
1378 pxStateList = listLIST_ITEM_CONTAINER( &( pxTCB->xStateListItem ) );
\r
1379 pxDelayedList = pxDelayedTaskList;
\r
1380 pxOverflowedDelayedList = pxOverflowDelayedTaskList;
\r
1382 taskEXIT_CRITICAL();
\r
1384 if( ( pxStateList == pxDelayedList ) || ( pxStateList == pxOverflowedDelayedList ) )
\r
1386 /* The task being queried is referenced from one of the Blocked
\r
1388 eReturn = eBlocked;
\r
1391 #if ( INCLUDE_vTaskSuspend == 1 )
\r
1392 else if( pxStateList == &xSuspendedTaskList )
\r
1394 /* The task being queried is referenced from the suspended
\r
1395 * list. Is it genuinely suspended or is it blocked
\r
1396 * indefinitely? */
\r
1397 if( listLIST_ITEM_CONTAINER( &( pxTCB->xEventListItem ) ) == NULL )
\r
1399 #if ( configUSE_TASK_NOTIFICATIONS == 1 )
\r
1403 /* The task does not appear on the event list item of
\r
1404 * and of the RTOS objects, but could still be in the
\r
1405 * blocked state if it is waiting on its notification
\r
1406 * rather than waiting on an object. If not, is
\r
1408 eReturn = eSuspended;
\r
1410 for( x = 0; x < configTASK_NOTIFICATION_ARRAY_ENTRIES; x++ )
\r
1412 if( pxTCB->ucNotifyState[ x ] == taskWAITING_NOTIFICATION )
\r
1414 eReturn = eBlocked;
\r
1419 #else /* if ( configUSE_TASK_NOTIFICATIONS == 1 ) */
\r
1421 eReturn = eSuspended;
\r
1423 #endif /* if ( configUSE_TASK_NOTIFICATIONS == 1 ) */
\r
1427 eReturn = eBlocked;
\r
1430 #endif /* if ( INCLUDE_vTaskSuspend == 1 ) */
\r
1432 #if ( INCLUDE_vTaskDelete == 1 )
\r
1433 else if( ( pxStateList == &xTasksWaitingTermination ) || ( pxStateList == NULL ) )
\r
1435 /* The task being queried is referenced from the deleted
\r
1436 * tasks list, or it is not referenced from any lists at
\r
1438 eReturn = eDeleted;
\r
1442 else /*lint !e525 Negative indentation is intended to make use of pre-processor clearer. */
\r
1444 /* If the task is not in any other state, it must be in the
\r
1445 * Ready (including pending ready) state. */
\r
1451 } /*lint !e818 xTask cannot be a pointer to const because it is a typedef. */
\r
1453 #endif /* INCLUDE_eTaskGetState */
\r
1454 /*-----------------------------------------------------------*/
\r
1456 #if ( INCLUDE_uxTaskPriorityGet == 1 )
\r
1458 UBaseType_t uxTaskPriorityGet( const TaskHandle_t xTask )
\r
1460 TCB_t const * pxTCB;
\r
1461 UBaseType_t uxReturn;
\r
1463 taskENTER_CRITICAL();
\r
1465 /* If null is passed in here then it is the priority of the task
\r
1466 * that called uxTaskPriorityGet() that is being queried. */
\r
1467 pxTCB = prvGetTCBFromHandle( xTask );
\r
1468 uxReturn = pxTCB->uxPriority;
\r
1470 taskEXIT_CRITICAL();
\r
1475 #endif /* INCLUDE_uxTaskPriorityGet */
\r
1476 /*-----------------------------------------------------------*/
\r
1478 #if ( INCLUDE_uxTaskPriorityGet == 1 )
\r
1480 UBaseType_t uxTaskPriorityGetFromISR( const TaskHandle_t xTask )
\r
1482 TCB_t const * pxTCB;
\r
1483 UBaseType_t uxReturn, uxSavedInterruptState;
\r
1485 /* RTOS ports that support interrupt nesting have the concept of a
\r
1486 * maximum system call (or maximum API call) interrupt priority.
\r
1487 * Interrupts that are above the maximum system call priority are keep
\r
1488 * permanently enabled, even when the RTOS kernel is in a critical section,
\r
1489 * but cannot make any calls to FreeRTOS API functions. If configASSERT()
\r
1490 * is defined in FreeRTOSConfig.h then
\r
1491 * portASSERT_IF_INTERRUPT_PRIORITY_INVALID() will result in an assertion
\r
1492 * failure if a FreeRTOS API function is called from an interrupt that has
\r
1493 * been assigned a priority above the configured maximum system call
\r
1494 * priority. Only FreeRTOS functions that end in FromISR can be called
\r
1495 * from interrupts that have been assigned a priority at or (logically)
\r
1496 * below the maximum system call interrupt priority. FreeRTOS maintains a
\r
1497 * separate interrupt safe API to ensure interrupt entry is as fast and as
\r
1498 * simple as possible. More information (albeit Cortex-M specific) is
\r
1499 * provided on the following link:
\r
1500 * https://www.FreeRTOS.org/RTOS-Cortex-M3-M4.html */
\r
1501 portASSERT_IF_INTERRUPT_PRIORITY_INVALID();
\r
1503 uxSavedInterruptState = portSET_INTERRUPT_MASK_FROM_ISR();
\r
1505 /* If null is passed in here then it is the priority of the calling
\r
1506 * task that is being queried. */
\r
1507 pxTCB = prvGetTCBFromHandle( xTask );
\r
1508 uxReturn = pxTCB->uxPriority;
\r
1510 portCLEAR_INTERRUPT_MASK_FROM_ISR( uxSavedInterruptState );
\r
1515 #endif /* INCLUDE_uxTaskPriorityGet */
\r
1516 /*-----------------------------------------------------------*/
\r
1518 #if ( INCLUDE_vTaskPrioritySet == 1 )
\r
1520 void vTaskPrioritySet( TaskHandle_t xTask,
\r
1521 UBaseType_t uxNewPriority )
\r
1524 UBaseType_t uxCurrentBasePriority, uxPriorityUsedOnEntry;
\r
1525 BaseType_t xYieldRequired = pdFALSE;
\r
1527 configASSERT( uxNewPriority < configMAX_PRIORITIES );
\r
1529 /* Ensure the new priority is valid. */
\r
1530 if( uxNewPriority >= ( UBaseType_t ) configMAX_PRIORITIES )
\r
1532 uxNewPriority = ( UBaseType_t ) configMAX_PRIORITIES - ( UBaseType_t ) 1U;
\r
1536 mtCOVERAGE_TEST_MARKER();
\r
1539 taskENTER_CRITICAL();
\r
1541 /* If null is passed in here then it is the priority of the calling
\r
1542 * task that is being changed. */
\r
1543 pxTCB = prvGetTCBFromHandle( xTask );
\r
1545 traceTASK_PRIORITY_SET( pxTCB, uxNewPriority );
\r
1547 #if ( configUSE_MUTEXES == 1 )
\r
1549 uxCurrentBasePriority = pxTCB->uxBasePriority;
\r
1553 uxCurrentBasePriority = pxTCB->uxPriority;
\r
1557 if( uxCurrentBasePriority != uxNewPriority )
\r
1559 /* The priority change may have readied a task of higher
\r
1560 * priority than the calling task. */
\r
1561 if( uxNewPriority > uxCurrentBasePriority )
\r
1563 if( pxTCB != pxCurrentTCB )
\r
1565 /* The priority of a task other than the currently
\r
1566 * running task is being raised. Is the priority being
\r
1567 * raised above that of the running task? */
\r
1568 if( uxNewPriority >= pxCurrentTCB->uxPriority )
\r
1570 xYieldRequired = pdTRUE;
\r
1574 mtCOVERAGE_TEST_MARKER();
\r
1579 /* The priority of the running task is being raised,
\r
1580 * but the running task must already be the highest
\r
1581 * priority task able to run so no yield is required. */
\r
1584 else if( pxTCB == pxCurrentTCB )
\r
1586 /* Setting the priority of the running task down means
\r
1587 * there may now be another task of higher priority that
\r
1588 * is ready to execute. */
\r
1589 xYieldRequired = pdTRUE;
\r
1593 /* Setting the priority of any other task down does not
\r
1594 * require a yield as the running task must be above the
\r
1595 * new priority of the task being modified. */
\r
1598 /* Remember the ready list the task might be referenced from
\r
1599 * before its uxPriority member is changed so the
\r
1600 * taskRESET_READY_PRIORITY() macro can function correctly. */
\r
1601 uxPriorityUsedOnEntry = pxTCB->uxPriority;
\r
1603 #if ( configUSE_MUTEXES == 1 )
\r
1605 /* Only change the priority being used if the task is not
\r
1606 * currently using an inherited priority. */
\r
1607 if( pxTCB->uxBasePriority == pxTCB->uxPriority )
\r
1609 pxTCB->uxPriority = uxNewPriority;
\r
1613 mtCOVERAGE_TEST_MARKER();
\r
1616 /* The base priority gets set whatever. */
\r
1617 pxTCB->uxBasePriority = uxNewPriority;
\r
1619 #else /* if ( configUSE_MUTEXES == 1 ) */
\r
1621 pxTCB->uxPriority = uxNewPriority;
\r
1623 #endif /* if ( configUSE_MUTEXES == 1 ) */
\r
1625 /* Only reset the event list item value if the value is not
\r
1626 * being used for anything else. */
\r
1627 if( ( listGET_LIST_ITEM_VALUE( &( pxTCB->xEventListItem ) ) & taskEVENT_LIST_ITEM_VALUE_IN_USE ) == 0UL )
\r
1629 listSET_LIST_ITEM_VALUE( &( pxTCB->xEventListItem ), ( ( TickType_t ) configMAX_PRIORITIES - ( TickType_t ) uxNewPriority ) ); /*lint !e961 MISRA exception as the casts are only redundant for some ports. */
\r
1633 mtCOVERAGE_TEST_MARKER();
\r
1636 /* If the task is in the blocked or suspended list we need do
\r
1637 * nothing more than change its priority variable. However, if
\r
1638 * the task is in a ready list it needs to be removed and placed
\r
1639 * in the list appropriate to its new priority. */
\r
1640 if( listIS_CONTAINED_WITHIN( &( pxReadyTasksLists[ uxPriorityUsedOnEntry ] ), &( pxTCB->xStateListItem ) ) != pdFALSE )
\r
1642 /* The task is currently in its ready list - remove before
\r
1643 * adding it to its new ready list. As we are in a critical
\r
1644 * section we can do this even if the scheduler is suspended. */
\r
1645 if( uxListRemove( &( pxTCB->xStateListItem ) ) == ( UBaseType_t ) 0 )
\r
1647 /* It is known that the task is in its ready list so
\r
1648 * there is no need to check again and the port level
\r
1649 * reset macro can be called directly. */
\r
1650 portRESET_READY_PRIORITY( uxPriorityUsedOnEntry, uxTopReadyPriority );
\r
1654 mtCOVERAGE_TEST_MARKER();
\r
1657 prvAddTaskToReadyList( pxTCB );
\r
1661 mtCOVERAGE_TEST_MARKER();
\r
1664 if( xYieldRequired != pdFALSE )
\r
1666 taskYIELD_IF_USING_PREEMPTION();
\r
1670 mtCOVERAGE_TEST_MARKER();
\r
1673 /* Remove compiler warning about unused variables when the port
\r
1674 * optimised task selection is not being used. */
\r
1675 ( void ) uxPriorityUsedOnEntry;
\r
1678 taskEXIT_CRITICAL();
\r
1681 #endif /* INCLUDE_vTaskPrioritySet */
\r
1682 /*-----------------------------------------------------------*/
\r
1684 #if ( INCLUDE_vTaskSuspend == 1 )
\r
1686 void vTaskSuspend( TaskHandle_t xTaskToSuspend )
\r
1690 taskENTER_CRITICAL();
\r
1692 /* If null is passed in here then it is the running task that is
\r
1693 * being suspended. */
\r
1694 pxTCB = prvGetTCBFromHandle( xTaskToSuspend );
\r
1696 traceTASK_SUSPEND( pxTCB );
\r
1698 /* Remove task from the ready/delayed list and place in the
\r
1699 * suspended list. */
\r
1700 if( uxListRemove( &( pxTCB->xStateListItem ) ) == ( UBaseType_t ) 0 )
\r
1702 taskRESET_READY_PRIORITY( pxTCB->uxPriority );
\r
1706 mtCOVERAGE_TEST_MARKER();
\r
1709 /* Is the task waiting on an event also? */
\r
1710 if( listLIST_ITEM_CONTAINER( &( pxTCB->xEventListItem ) ) != NULL )
\r
1712 ( void ) uxListRemove( &( pxTCB->xEventListItem ) );
\r
1716 mtCOVERAGE_TEST_MARKER();
\r
1719 vListInsertEnd( &xSuspendedTaskList, &( pxTCB->xStateListItem ) );
\r
1721 #if ( configUSE_TASK_NOTIFICATIONS == 1 )
\r
1725 for( x = 0; x < configTASK_NOTIFICATION_ARRAY_ENTRIES; x++ )
\r
1727 if( pxTCB->ucNotifyState[ x ] == taskWAITING_NOTIFICATION )
\r
1729 /* The task was blocked to wait for a notification, but is
\r
1730 * now suspended, so no notification was received. */
\r
1731 pxTCB->ucNotifyState[ x ] = taskNOT_WAITING_NOTIFICATION;
\r
1735 #endif /* if ( configUSE_TASK_NOTIFICATIONS == 1 ) */
\r
1737 taskEXIT_CRITICAL();
\r
1739 if( xSchedulerRunning != pdFALSE )
\r
1741 /* Reset the next expected unblock time in case it referred to the
\r
1742 * task that is now in the Suspended state. */
\r
1743 taskENTER_CRITICAL();
\r
1745 prvResetNextTaskUnblockTime();
\r
1747 taskEXIT_CRITICAL();
\r
1751 mtCOVERAGE_TEST_MARKER();
\r
1754 if( pxTCB == pxCurrentTCB )
\r
1756 if( xSchedulerRunning != pdFALSE )
\r
1758 /* The current task has just been suspended. */
\r
1759 configASSERT( uxSchedulerSuspended == 0 );
\r
1760 portYIELD_WITHIN_API();
\r
1764 /* The scheduler is not running, but the task that was pointed
\r
1765 * to by pxCurrentTCB has just been suspended and pxCurrentTCB
\r
1766 * must be adjusted to point to a different task. */
\r
1767 if( listCURRENT_LIST_LENGTH( &xSuspendedTaskList ) == uxCurrentNumberOfTasks ) /*lint !e931 Right has no side effect, just volatile. */
\r
1769 /* No other tasks are ready, so set pxCurrentTCB back to
\r
1770 * NULL so when the next task is created pxCurrentTCB will
\r
1771 * be set to point to it no matter what its relative priority
\r
1773 pxCurrentTCB = NULL;
\r
1777 vTaskSwitchContext();
\r
1783 mtCOVERAGE_TEST_MARKER();
\r
1787 #endif /* INCLUDE_vTaskSuspend */
\r
1788 /*-----------------------------------------------------------*/
\r
1790 #if ( INCLUDE_vTaskSuspend == 1 )
\r
1792 static BaseType_t prvTaskIsTaskSuspended( const TaskHandle_t xTask )
\r
1794 BaseType_t xReturn = pdFALSE;
\r
1795 const TCB_t * const pxTCB = xTask;
\r
1797 /* Accesses xPendingReadyList so must be called from a critical
\r
1800 /* It does not make sense to check if the calling task is suspended. */
\r
1801 configASSERT( xTask );
\r
1803 /* Is the task being resumed actually in the suspended list? */
\r
1804 if( listIS_CONTAINED_WITHIN( &xSuspendedTaskList, &( pxTCB->xStateListItem ) ) != pdFALSE )
\r
1806 /* Has the task already been resumed from within an ISR? */
\r
1807 if( listIS_CONTAINED_WITHIN( &xPendingReadyList, &( pxTCB->xEventListItem ) ) == pdFALSE )
\r
1809 /* Is it in the suspended list because it is in the Suspended
\r
1810 * state, or because is is blocked with no timeout? */
\r
1811 if( listIS_CONTAINED_WITHIN( NULL, &( pxTCB->xEventListItem ) ) != pdFALSE ) /*lint !e961. The cast is only redundant when NULL is used. */
\r
1817 mtCOVERAGE_TEST_MARKER();
\r
1822 mtCOVERAGE_TEST_MARKER();
\r
1827 mtCOVERAGE_TEST_MARKER();
\r
1831 } /*lint !e818 xTask cannot be a pointer to const because it is a typedef. */
\r
1833 #endif /* INCLUDE_vTaskSuspend */
\r
1834 /*-----------------------------------------------------------*/
\r
1836 #if ( INCLUDE_vTaskSuspend == 1 )
\r
1838 void vTaskResume( TaskHandle_t xTaskToResume )
\r
1840 TCB_t * const pxTCB = xTaskToResume;
\r
1842 /* It does not make sense to resume the calling task. */
\r
1843 configASSERT( xTaskToResume );
\r
1845 /* The parameter cannot be NULL as it is impossible to resume the
\r
1846 * currently executing task. */
\r
1847 if( ( pxTCB != pxCurrentTCB ) && ( pxTCB != NULL ) )
\r
1849 taskENTER_CRITICAL();
\r
1851 if( prvTaskIsTaskSuspended( pxTCB ) != pdFALSE )
\r
1853 traceTASK_RESUME( pxTCB );
\r
1855 /* The ready list can be accessed even if the scheduler is
\r
1856 * suspended because this is inside a critical section. */
\r
1857 ( void ) uxListRemove( &( pxTCB->xStateListItem ) );
\r
1858 prvAddTaskToReadyList( pxTCB );
\r
1860 /* A higher priority task may have just been resumed. */
\r
1861 if( pxTCB->uxPriority >= pxCurrentTCB->uxPriority )
\r
1863 /* This yield may not cause the task just resumed to run,
\r
1864 * but will leave the lists in the correct state for the
\r
1866 taskYIELD_IF_USING_PREEMPTION();
\r
1870 mtCOVERAGE_TEST_MARKER();
\r
1875 mtCOVERAGE_TEST_MARKER();
\r
1878 taskEXIT_CRITICAL();
\r
1882 mtCOVERAGE_TEST_MARKER();
\r
1886 #endif /* INCLUDE_vTaskSuspend */
\r
1888 /*-----------------------------------------------------------*/
\r
1890 #if ( ( INCLUDE_xTaskResumeFromISR == 1 ) && ( INCLUDE_vTaskSuspend == 1 ) )
\r
1892 BaseType_t xTaskResumeFromISR( TaskHandle_t xTaskToResume )
\r
1894 BaseType_t xYieldRequired = pdFALSE;
\r
1895 TCB_t * const pxTCB = xTaskToResume;
\r
1896 UBaseType_t uxSavedInterruptStatus;
\r
1898 configASSERT( xTaskToResume );
\r
1900 /* RTOS ports that support interrupt nesting have the concept of a
\r
1901 * maximum system call (or maximum API call) interrupt priority.
\r
1902 * Interrupts that are above the maximum system call priority are keep
\r
1903 * permanently enabled, even when the RTOS kernel is in a critical section,
\r
1904 * but cannot make any calls to FreeRTOS API functions. If configASSERT()
\r
1905 * is defined in FreeRTOSConfig.h then
\r
1906 * portASSERT_IF_INTERRUPT_PRIORITY_INVALID() will result in an assertion
\r
1907 * failure if a FreeRTOS API function is called from an interrupt that has
\r
1908 * been assigned a priority above the configured maximum system call
\r
1909 * priority. Only FreeRTOS functions that end in FromISR can be called
\r
1910 * from interrupts that have been assigned a priority at or (logically)
\r
1911 * below the maximum system call interrupt priority. FreeRTOS maintains a
\r
1912 * separate interrupt safe API to ensure interrupt entry is as fast and as
\r
1913 * simple as possible. More information (albeit Cortex-M specific) is
\r
1914 * provided on the following link:
\r
1915 * https://www.FreeRTOS.org/RTOS-Cortex-M3-M4.html */
\r
1916 portASSERT_IF_INTERRUPT_PRIORITY_INVALID();
\r
1918 uxSavedInterruptStatus = portSET_INTERRUPT_MASK_FROM_ISR();
\r
1920 if( prvTaskIsTaskSuspended( pxTCB ) != pdFALSE )
\r
1922 traceTASK_RESUME_FROM_ISR( pxTCB );
\r
1924 /* Check the ready lists can be accessed. */
\r
1925 if( uxSchedulerSuspended == ( UBaseType_t ) pdFALSE )
\r
1927 /* Ready lists can be accessed so move the task from the
\r
1928 * suspended list to the ready list directly. */
\r
1929 if( pxTCB->uxPriority >= pxCurrentTCB->uxPriority )
\r
1931 xYieldRequired = pdTRUE;
\r
1933 /* Mark that a yield is pending in case the user is not
\r
1934 * using the return value to initiate a context switch
\r
1935 * from the ISR using portYIELD_FROM_ISR. */
\r
1936 xYieldPending = pdTRUE;
\r
1940 mtCOVERAGE_TEST_MARKER();
\r
1943 ( void ) uxListRemove( &( pxTCB->xStateListItem ) );
\r
1944 prvAddTaskToReadyList( pxTCB );
\r
1948 /* The delayed or ready lists cannot be accessed so the task
\r
1949 * is held in the pending ready list until the scheduler is
\r
1951 vListInsertEnd( &( xPendingReadyList ), &( pxTCB->xEventListItem ) );
\r
1956 mtCOVERAGE_TEST_MARKER();
\r
1959 portCLEAR_INTERRUPT_MASK_FROM_ISR( uxSavedInterruptStatus );
\r
1961 return xYieldRequired;
\r
1964 #endif /* ( ( INCLUDE_xTaskResumeFromISR == 1 ) && ( INCLUDE_vTaskSuspend == 1 ) ) */
\r
1965 /*-----------------------------------------------------------*/
\r
1967 void vTaskStartScheduler( void )
\r
1969 BaseType_t xReturn;
\r
1971 /* Add the idle task at the lowest priority. */
\r
1972 #if ( configSUPPORT_STATIC_ALLOCATION == 1 )
\r
1974 StaticTask_t * pxIdleTaskTCBBuffer = NULL;
\r
1975 StackType_t * pxIdleTaskStackBuffer = NULL;
\r
1976 uint32_t ulIdleTaskStackSize;
\r
1978 /* The Idle task is created using user provided RAM - obtain the
\r
1979 * address of the RAM then create the idle task. */
\r
1980 vApplicationGetIdleTaskMemory( &pxIdleTaskTCBBuffer, &pxIdleTaskStackBuffer, &ulIdleTaskStackSize );
\r
1981 xIdleTaskHandle = xTaskCreateStatic( prvIdleTask,
\r
1982 configIDLE_TASK_NAME,
\r
1983 ulIdleTaskStackSize,
\r
1984 ( void * ) NULL, /*lint !e961. The cast is not redundant for all compilers. */
\r
1985 portPRIVILEGE_BIT, /* In effect ( tskIDLE_PRIORITY | portPRIVILEGE_BIT ), but tskIDLE_PRIORITY is zero. */
\r
1986 pxIdleTaskStackBuffer,
\r
1987 pxIdleTaskTCBBuffer ); /*lint !e961 MISRA exception, justified as it is not a redundant explicit cast to all supported compilers. */
\r
1989 if( xIdleTaskHandle != NULL )
\r
1998 #else /* if ( configSUPPORT_STATIC_ALLOCATION == 1 ) */
\r
2000 /* The Idle task is being created using dynamically allocated RAM. */
\r
2001 xReturn = xTaskCreate( prvIdleTask,
\r
2002 configIDLE_TASK_NAME,
\r
2003 configMINIMAL_STACK_SIZE,
\r
2005 portPRIVILEGE_BIT, /* In effect ( tskIDLE_PRIORITY | portPRIVILEGE_BIT ), but tskIDLE_PRIORITY is zero. */
\r
2006 &xIdleTaskHandle ); /*lint !e961 MISRA exception, justified as it is not a redundant explicit cast to all supported compilers. */
\r
2008 #endif /* configSUPPORT_STATIC_ALLOCATION */
\r
2010 #if ( configUSE_TIMERS == 1 )
\r
2012 if( xReturn == pdPASS )
\r
2014 xReturn = xTimerCreateTimerTask();
\r
2018 mtCOVERAGE_TEST_MARKER();
\r
2021 #endif /* configUSE_TIMERS */
\r
2023 if( xReturn == pdPASS )
\r
2025 /* freertos_tasks_c_additions_init() should only be called if the user
\r
2026 * definable macro FREERTOS_TASKS_C_ADDITIONS_INIT() is defined, as that is
\r
2027 * the only macro called by the function. */
\r
2028 #ifdef FREERTOS_TASKS_C_ADDITIONS_INIT
\r
2030 freertos_tasks_c_additions_init();
\r
2034 /* Interrupts are turned off here, to ensure a tick does not occur
\r
2035 * before or during the call to xPortStartScheduler(). The stacks of
\r
2036 * the created tasks contain a status word with interrupts switched on
\r
2037 * so interrupts will automatically get re-enabled when the first task
\r
2038 * starts to run. */
\r
2039 portDISABLE_INTERRUPTS();
\r
2041 #if ( configUSE_NEWLIB_REENTRANT == 1 )
\r
2043 /* Switch Newlib's _impure_ptr variable to point to the _reent
\r
2044 * structure specific to the task that will run first.
\r
2045 * See the third party link http://www.nadler.com/embedded/newlibAndFreeRTOS.html
\r
2046 * for additional information. */
\r
2047 _impure_ptr = &( pxCurrentTCB->xNewLib_reent );
\r
2049 #endif /* configUSE_NEWLIB_REENTRANT */
\r
2051 xNextTaskUnblockTime = portMAX_DELAY;
\r
2052 xSchedulerRunning = pdTRUE;
\r
2053 xTickCount = ( TickType_t ) configINITIAL_TICK_COUNT;
\r
2055 /* If configGENERATE_RUN_TIME_STATS is defined then the following
\r
2056 * macro must be defined to configure the timer/counter used to generate
\r
2057 * the run time counter time base. NOTE: If configGENERATE_RUN_TIME_STATS
\r
2058 * is set to 0 and the following line fails to build then ensure you do not
\r
2059 * have portCONFIGURE_TIMER_FOR_RUN_TIME_STATS() defined in your
\r
2060 * FreeRTOSConfig.h file. */
\r
2061 portCONFIGURE_TIMER_FOR_RUN_TIME_STATS();
\r
2063 traceTASK_SWITCHED_IN();
\r
2065 /* Setting up the timer tick is hardware specific and thus in the
\r
2066 * portable interface. */
\r
2067 xPortStartScheduler();
\r
2069 /* In most cases, xPortStartScheduler() will not return. If it
\r
2070 * returns pdTRUE then there was not enough heap memory available
\r
2071 * to create either the Idle or the Timer task. If it returned
\r
2072 * pdFALSE, then the application called xTaskEndScheduler().
\r
2073 * Most ports don't implement xTaskEndScheduler() as there is
\r
2074 * nothing to return to. */
\r
2078 /* This line will only be reached if the kernel could not be started,
\r
2079 * because there was not enough FreeRTOS heap to create the idle task
\r
2080 * or the timer task. */
\r
2081 configASSERT( xReturn != errCOULD_NOT_ALLOCATE_REQUIRED_MEMORY );
\r
2084 /* Prevent compiler warnings if INCLUDE_xTaskGetIdleTaskHandle is set to 0,
\r
2085 * meaning xIdleTaskHandle is not used anywhere else. */
\r
2086 ( void ) xIdleTaskHandle;
\r
2088 /* OpenOCD makes use of uxTopUsedPriority for thread debugging. Prevent uxTopUsedPriority
\r
2089 * from getting optimized out as it is no longer used by the kernel. */
\r
2090 ( void ) uxTopUsedPriority;
\r
2092 /*-----------------------------------------------------------*/
\r
2094 void vTaskEndScheduler( void )
\r
2096 /* Stop the scheduler interrupts and call the portable scheduler end
\r
2097 * routine so the original ISRs can be restored if necessary. The port
\r
2098 * layer must ensure interrupts enable bit is left in the correct state. */
\r
2099 portDISABLE_INTERRUPTS();
\r
2100 xSchedulerRunning = pdFALSE;
\r
2101 vPortEndScheduler();
\r
2103 /*----------------------------------------------------------*/
\r
2105 void vTaskSuspendAll( void )
\r
2107 /* A critical section is not required as the variable is of type
\r
2108 * BaseType_t. Please read Richard Barry's reply in the following link to a
\r
2109 * post in the FreeRTOS support forum before reporting this as a bug! -
\r
2110 * https://goo.gl/wu4acr */
\r
2112 /* portSOFTWARE_BARRIER() is only implemented for emulated/simulated ports that
\r
2113 * do not otherwise exhibit real time behaviour. */
\r
2114 portSOFTWARE_BARRIER();
\r
2116 /* The scheduler is suspended if uxSchedulerSuspended is non-zero. An increment
\r
2117 * is used to allow calls to vTaskSuspendAll() to nest. */
\r
2118 ++uxSchedulerSuspended;
\r
2120 /* Enforces ordering for ports and optimised compilers that may otherwise place
\r
2121 * the above increment elsewhere. */
\r
2122 portMEMORY_BARRIER();
\r
2124 /*----------------------------------------------------------*/
\r
2126 #if ( configUSE_TICKLESS_IDLE != 0 )
\r
2128 static TickType_t prvGetExpectedIdleTime( void )
\r
2130 TickType_t xReturn;
\r
2131 UBaseType_t uxHigherPriorityReadyTasks = pdFALSE;
\r
2133 /* uxHigherPriorityReadyTasks takes care of the case where
\r
2134 * configUSE_PREEMPTION is 0, so there may be tasks above the idle priority
\r
2135 * task that are in the Ready state, even though the idle task is
\r
2137 #if ( configUSE_PORT_OPTIMISED_TASK_SELECTION == 0 )
\r
2139 if( uxTopReadyPriority > tskIDLE_PRIORITY )
\r
2141 uxHigherPriorityReadyTasks = pdTRUE;
\r
2146 const UBaseType_t uxLeastSignificantBit = ( UBaseType_t ) 0x01;
\r
2148 /* When port optimised task selection is used the uxTopReadyPriority
\r
2149 * variable is used as a bit map. If bits other than the least
\r
2150 * significant bit are set then there are tasks that have a priority
\r
2151 * above the idle priority that are in the Ready state. This takes
\r
2152 * care of the case where the co-operative scheduler is in use. */
\r
2153 if( uxTopReadyPriority > uxLeastSignificantBit )
\r
2155 uxHigherPriorityReadyTasks = pdTRUE;
\r
2158 #endif /* if ( configUSE_PORT_OPTIMISED_TASK_SELECTION == 0 ) */
\r
2160 if( pxCurrentTCB->uxPriority > tskIDLE_PRIORITY )
\r
2164 else if( listCURRENT_LIST_LENGTH( &( pxReadyTasksLists[ tskIDLE_PRIORITY ] ) ) > 1 )
\r
2166 /* There are other idle priority tasks in the ready state. If
\r
2167 * time slicing is used then the very next tick interrupt must be
\r
2171 else if( uxHigherPriorityReadyTasks != pdFALSE )
\r
2173 /* There are tasks in the Ready state that have a priority above the
\r
2174 * idle priority. This path can only be reached if
\r
2175 * configUSE_PREEMPTION is 0. */
\r
2180 xReturn = xNextTaskUnblockTime - xTickCount;
\r
2186 #endif /* configUSE_TICKLESS_IDLE */
\r
2187 /*----------------------------------------------------------*/
\r
2189 BaseType_t xTaskResumeAll( void )
\r
2191 TCB_t * pxTCB = NULL;
\r
2192 BaseType_t xAlreadyYielded = pdFALSE;
\r
2194 /* If uxSchedulerSuspended is zero then this function does not match a
\r
2195 * previous call to vTaskSuspendAll(). */
\r
2196 configASSERT( uxSchedulerSuspended );
\r
2198 /* It is possible that an ISR caused a task to be removed from an event
\r
2199 * list while the scheduler was suspended. If this was the case then the
\r
2200 * removed task will have been added to the xPendingReadyList. Once the
\r
2201 * scheduler has been resumed it is safe to move all the pending ready
\r
2202 * tasks from this list into their appropriate ready list. */
\r
2203 taskENTER_CRITICAL();
\r
2205 --uxSchedulerSuspended;
\r
2207 if( uxSchedulerSuspended == ( UBaseType_t ) pdFALSE )
\r
2209 if( uxCurrentNumberOfTasks > ( UBaseType_t ) 0U )
\r
2211 /* Move any readied tasks from the pending list into the
\r
2212 * appropriate ready list. */
\r
2213 while( listLIST_IS_EMPTY( &xPendingReadyList ) == pdFALSE )
\r
2215 pxTCB = listGET_OWNER_OF_HEAD_ENTRY( ( &xPendingReadyList ) ); /*lint !e9079 void * is used as this macro is used with timers and co-routines too. Alignment is known to be fine as the type of the pointer stored and retrieved is the same. */
\r
2216 listREMOVE_ITEM( &( pxTCB->xEventListItem ) );
\r
2217 portMEMORY_BARRIER();
\r
2218 listREMOVE_ITEM( &( pxTCB->xStateListItem ) );
\r
2219 prvAddTaskToReadyList( pxTCB );
\r
2221 /* If the moved task has a priority higher than or equal to
\r
2222 * the current task then a yield must be performed. */
\r
2223 if( pxTCB->uxPriority >= pxCurrentTCB->uxPriority )
\r
2225 xYieldPending = pdTRUE;
\r
2229 mtCOVERAGE_TEST_MARKER();
\r
2233 if( pxTCB != NULL )
\r
2235 /* A task was unblocked while the scheduler was suspended,
\r
2236 * which may have prevented the next unblock time from being
\r
2237 * re-calculated, in which case re-calculate it now. Mainly
\r
2238 * important for low power tickless implementations, where
\r
2239 * this can prevent an unnecessary exit from low power
\r
2241 prvResetNextTaskUnblockTime();
\r
2244 /* If any ticks occurred while the scheduler was suspended then
\r
2245 * they should be processed now. This ensures the tick count does
\r
2246 * not slip, and that any delayed tasks are resumed at the correct
\r
2249 TickType_t xPendedCounts = xPendedTicks; /* Non-volatile copy. */
\r
2251 if( xPendedCounts > ( TickType_t ) 0U )
\r
2255 if( xTaskIncrementTick() != pdFALSE )
\r
2257 xYieldPending = pdTRUE;
\r
2261 mtCOVERAGE_TEST_MARKER();
\r
2265 } while( xPendedCounts > ( TickType_t ) 0U );
\r
2271 mtCOVERAGE_TEST_MARKER();
\r
2275 if( xYieldPending != pdFALSE )
\r
2277 #if ( configUSE_PREEMPTION != 0 )
\r
2279 xAlreadyYielded = pdTRUE;
\r
2282 taskYIELD_IF_USING_PREEMPTION();
\r
2286 mtCOVERAGE_TEST_MARKER();
\r
2292 mtCOVERAGE_TEST_MARKER();
\r
2295 taskEXIT_CRITICAL();
\r
2297 return xAlreadyYielded;
\r
2299 /*-----------------------------------------------------------*/
\r
2301 TickType_t xTaskGetTickCount( void )
\r
2303 TickType_t xTicks;
\r
2305 /* Critical section required if running on a 16 bit processor. */
\r
2306 portTICK_TYPE_ENTER_CRITICAL();
\r
2308 xTicks = xTickCount;
\r
2310 portTICK_TYPE_EXIT_CRITICAL();
\r
2314 /*-----------------------------------------------------------*/
\r
2316 TickType_t xTaskGetTickCountFromISR( void )
\r
2318 TickType_t xReturn;
\r
2319 UBaseType_t uxSavedInterruptStatus;
\r
2321 /* RTOS ports that support interrupt nesting have the concept of a maximum
\r
2322 * system call (or maximum API call) interrupt priority. Interrupts that are
\r
2323 * above the maximum system call priority are kept permanently enabled, even
\r
2324 * when the RTOS kernel is in a critical section, but cannot make any calls to
\r
2325 * FreeRTOS API functions. If configASSERT() is defined in FreeRTOSConfig.h
\r
2326 * then portASSERT_IF_INTERRUPT_PRIORITY_INVALID() will result in an assertion
\r
2327 * failure if a FreeRTOS API function is called from an interrupt that has been
\r
2328 * assigned a priority above the configured maximum system call priority.
\r
2329 * Only FreeRTOS functions that end in FromISR can be called from interrupts
\r
2330 * that have been assigned a priority at or (logically) below the maximum
\r
2331 * system call interrupt priority. FreeRTOS maintains a separate interrupt
\r
2332 * safe API to ensure interrupt entry is as fast and as simple as possible.
\r
2333 * More information (albeit Cortex-M specific) is provided on the following
\r
2334 * link: https://www.FreeRTOS.org/RTOS-Cortex-M3-M4.html */
\r
2335 portASSERT_IF_INTERRUPT_PRIORITY_INVALID();
\r
2337 uxSavedInterruptStatus = portTICK_TYPE_SET_INTERRUPT_MASK_FROM_ISR();
\r
2339 xReturn = xTickCount;
\r
2341 portTICK_TYPE_CLEAR_INTERRUPT_MASK_FROM_ISR( uxSavedInterruptStatus );
\r
2345 /*-----------------------------------------------------------*/
\r
2347 UBaseType_t uxTaskGetNumberOfTasks( void )
\r
2349 /* A critical section is not required because the variables are of type
\r
2351 return uxCurrentNumberOfTasks;
\r
2353 /*-----------------------------------------------------------*/
\r
2355 char * pcTaskGetName( TaskHandle_t xTaskToQuery ) /*lint !e971 Unqualified char types are allowed for strings and single characters only. */
\r
2359 /* If null is passed in here then the name of the calling task is being
\r
2361 pxTCB = prvGetTCBFromHandle( xTaskToQuery );
\r
2362 configASSERT( pxTCB );
\r
2363 return &( pxTCB->pcTaskName[ 0 ] );
\r
2365 /*-----------------------------------------------------------*/
\r
2367 #if ( INCLUDE_xTaskGetHandle == 1 )
\r
2369 static TCB_t * prvSearchForNameWithinSingleList( List_t * pxList,
\r
2370 const char pcNameToQuery[] )
\r
2372 TCB_t * pxNextTCB, * pxFirstTCB, * pxReturn = NULL;
\r
2375 BaseType_t xBreakLoop;
\r
2377 /* This function is called with the scheduler suspended. */
\r
2379 if( listCURRENT_LIST_LENGTH( pxList ) > ( UBaseType_t ) 0 )
\r
2381 listGET_OWNER_OF_NEXT_ENTRY( pxFirstTCB, pxList ); /*lint !e9079 void * is used as this macro is used with timers and co-routines too. Alignment is known to be fine as the type of the pointer stored and retrieved is the same. */
\r
2385 listGET_OWNER_OF_NEXT_ENTRY( pxNextTCB, pxList ); /*lint !e9079 void * is used as this macro is used with timers and co-routines too. Alignment is known to be fine as the type of the pointer stored and retrieved is the same. */
\r
2387 /* Check each character in the name looking for a match or
\r
2389 xBreakLoop = pdFALSE;
\r
2391 for( x = ( UBaseType_t ) 0; x < ( UBaseType_t ) configMAX_TASK_NAME_LEN; x++ )
\r
2393 cNextChar = pxNextTCB->pcTaskName[ x ];
\r
2395 if( cNextChar != pcNameToQuery[ x ] )
\r
2397 /* Characters didn't match. */
\r
2398 xBreakLoop = pdTRUE;
\r
2400 else if( cNextChar == ( char ) 0x00 )
\r
2402 /* Both strings terminated, a match must have been
\r
2404 pxReturn = pxNextTCB;
\r
2405 xBreakLoop = pdTRUE;
\r
2409 mtCOVERAGE_TEST_MARKER();
\r
2412 if( xBreakLoop != pdFALSE )
\r
2418 if( pxReturn != NULL )
\r
2420 /* The handle has been found. */
\r
2423 } while( pxNextTCB != pxFirstTCB );
\r
2427 mtCOVERAGE_TEST_MARKER();
\r
2433 #endif /* INCLUDE_xTaskGetHandle */
\r
2434 /*-----------------------------------------------------------*/
\r
2436 #if ( INCLUDE_xTaskGetHandle == 1 )
\r
2438 TaskHandle_t xTaskGetHandle( const char * pcNameToQuery ) /*lint !e971 Unqualified char types are allowed for strings and single characters only. */
\r
2440 UBaseType_t uxQueue = configMAX_PRIORITIES;
\r
2443 /* Task names will be truncated to configMAX_TASK_NAME_LEN - 1 bytes. */
\r
2444 configASSERT( strlen( pcNameToQuery ) < configMAX_TASK_NAME_LEN );
\r
2446 vTaskSuspendAll();
\r
2448 /* Search the ready lists. */
\r
2452 pxTCB = prvSearchForNameWithinSingleList( ( List_t * ) &( pxReadyTasksLists[ uxQueue ] ), pcNameToQuery );
\r
2454 if( pxTCB != NULL )
\r
2456 /* Found the handle. */
\r
2459 } while( uxQueue > ( UBaseType_t ) tskIDLE_PRIORITY ); /*lint !e961 MISRA exception as the casts are only redundant for some ports. */
\r
2461 /* Search the delayed lists. */
\r
2462 if( pxTCB == NULL )
\r
2464 pxTCB = prvSearchForNameWithinSingleList( ( List_t * ) pxDelayedTaskList, pcNameToQuery );
\r
2467 if( pxTCB == NULL )
\r
2469 pxTCB = prvSearchForNameWithinSingleList( ( List_t * ) pxOverflowDelayedTaskList, pcNameToQuery );
\r
2472 #if ( INCLUDE_vTaskSuspend == 1 )
\r
2474 if( pxTCB == NULL )
\r
2476 /* Search the suspended list. */
\r
2477 pxTCB = prvSearchForNameWithinSingleList( &xSuspendedTaskList, pcNameToQuery );
\r
2482 #if ( INCLUDE_vTaskDelete == 1 )
\r
2484 if( pxTCB == NULL )
\r
2486 /* Search the deleted list. */
\r
2487 pxTCB = prvSearchForNameWithinSingleList( &xTasksWaitingTermination, pcNameToQuery );
\r
2492 ( void ) xTaskResumeAll();
\r
2497 #endif /* INCLUDE_xTaskGetHandle */
\r
2498 /*-----------------------------------------------------------*/
\r
2500 #if ( configUSE_TRACE_FACILITY == 1 )
\r
2502 UBaseType_t uxTaskGetSystemState( TaskStatus_t * const pxTaskStatusArray,
\r
2503 const UBaseType_t uxArraySize,
\r
2504 configRUN_TIME_COUNTER_TYPE * const pulTotalRunTime )
\r
2506 UBaseType_t uxTask = 0, uxQueue = configMAX_PRIORITIES;
\r
2508 vTaskSuspendAll();
\r
2510 /* Is there a space in the array for each task in the system? */
\r
2511 if( uxArraySize >= uxCurrentNumberOfTasks )
\r
2513 /* Fill in an TaskStatus_t structure with information on each
\r
2514 * task in the Ready state. */
\r
2518 uxTask += prvListTasksWithinSingleList( &( pxTaskStatusArray[ uxTask ] ), &( pxReadyTasksLists[ uxQueue ] ), eReady );
\r
2519 } while( uxQueue > ( UBaseType_t ) tskIDLE_PRIORITY ); /*lint !e961 MISRA exception as the casts are only redundant for some ports. */
\r
2521 /* Fill in an TaskStatus_t structure with information on each
\r
2522 * task in the Blocked state. */
\r
2523 uxTask += prvListTasksWithinSingleList( &( pxTaskStatusArray[ uxTask ] ), ( List_t * ) pxDelayedTaskList, eBlocked );
\r
2524 uxTask += prvListTasksWithinSingleList( &( pxTaskStatusArray[ uxTask ] ), ( List_t * ) pxOverflowDelayedTaskList, eBlocked );
\r
2526 #if ( INCLUDE_vTaskDelete == 1 )
\r
2528 /* Fill in an TaskStatus_t structure with information on
\r
2529 * each task that has been deleted but not yet cleaned up. */
\r
2530 uxTask += prvListTasksWithinSingleList( &( pxTaskStatusArray[ uxTask ] ), &xTasksWaitingTermination, eDeleted );
\r
2534 #if ( INCLUDE_vTaskSuspend == 1 )
\r
2536 /* Fill in an TaskStatus_t structure with information on
\r
2537 * each task in the Suspended state. */
\r
2538 uxTask += prvListTasksWithinSingleList( &( pxTaskStatusArray[ uxTask ] ), &xSuspendedTaskList, eSuspended );
\r
2542 #if ( configGENERATE_RUN_TIME_STATS == 1 )
\r
2544 if( pulTotalRunTime != NULL )
\r
2546 #ifdef portALT_GET_RUN_TIME_COUNTER_VALUE
\r
2547 portALT_GET_RUN_TIME_COUNTER_VALUE( ( *pulTotalRunTime ) );
\r
2549 *pulTotalRunTime = portGET_RUN_TIME_COUNTER_VALUE();
\r
2553 #else /* if ( configGENERATE_RUN_TIME_STATS == 1 ) */
\r
2555 if( pulTotalRunTime != NULL )
\r
2557 *pulTotalRunTime = 0;
\r
2560 #endif /* if ( configGENERATE_RUN_TIME_STATS == 1 ) */
\r
2564 mtCOVERAGE_TEST_MARKER();
\r
2567 ( void ) xTaskResumeAll();
\r
2572 #endif /* configUSE_TRACE_FACILITY */
\r
2573 /*----------------------------------------------------------*/
\r
2575 #if ( INCLUDE_xTaskGetIdleTaskHandle == 1 )
\r
2577 TaskHandle_t xTaskGetIdleTaskHandle( void )
\r
2579 /* If xTaskGetIdleTaskHandle() is called before the scheduler has been
\r
2580 * started, then xIdleTaskHandle will be NULL. */
\r
2581 configASSERT( ( xIdleTaskHandle != NULL ) );
\r
2582 return xIdleTaskHandle;
\r
2585 #endif /* INCLUDE_xTaskGetIdleTaskHandle */
\r
2586 /*----------------------------------------------------------*/
\r
2588 /* This conditional compilation should use inequality to 0, not equality to 1.
\r
2589 * This is to ensure vTaskStepTick() is available when user defined low power mode
\r
2590 * implementations require configUSE_TICKLESS_IDLE to be set to a value other than
\r
2592 #if ( configUSE_TICKLESS_IDLE != 0 )
\r
2594 void vTaskStepTick( TickType_t xTicksToJump )
\r
2596 /* Correct the tick count value after a period during which the tick
\r
2597 * was suppressed. Note this does *not* call the tick hook function for
\r
2598 * each stepped tick. */
\r
2599 configASSERT( ( xTickCount + xTicksToJump ) <= xNextTaskUnblockTime );
\r
2601 if( ( xTickCount + xTicksToJump ) == xNextTaskUnblockTime )
\r
2603 /* Arrange for xTickCount to reach xNextTaskUnblockTime in
\r
2604 * xTaskIncrementTick() when the scheduler resumes. This ensures
\r
2605 * that any delayed tasks are resumed at the correct time. */
\r
2606 configASSERT( uxSchedulerSuspended );
\r
2607 configASSERT( xTicksToJump != ( TickType_t ) 0 );
\r
2609 /* Prevent the tick interrupt modifying xPendedTicks simultaneously. */
\r
2610 taskENTER_CRITICAL();
\r
2614 taskEXIT_CRITICAL();
\r
2619 mtCOVERAGE_TEST_MARKER();
\r
2622 xTickCount += xTicksToJump;
\r
2623 traceINCREASE_TICK_COUNT( xTicksToJump );
\r
2626 #endif /* configUSE_TICKLESS_IDLE */
\r
2627 /*----------------------------------------------------------*/
\r
2629 BaseType_t xTaskCatchUpTicks( TickType_t xTicksToCatchUp )
\r
2631 BaseType_t xYieldOccurred;
\r
2633 /* Must not be called with the scheduler suspended as the implementation
\r
2634 * relies on xPendedTicks being wound down to 0 in xTaskResumeAll(). */
\r
2635 configASSERT( uxSchedulerSuspended == 0 );
\r
2637 /* Use xPendedTicks to mimic xTicksToCatchUp number of ticks occurring when
\r
2638 * the scheduler is suspended so the ticks are executed in xTaskResumeAll(). */
\r
2639 vTaskSuspendAll();
\r
2641 /* Prevent the tick interrupt modifying xPendedTicks simultaneously. */
\r
2642 taskENTER_CRITICAL();
\r
2644 xPendedTicks += xTicksToCatchUp;
\r
2646 taskEXIT_CRITICAL();
\r
2647 xYieldOccurred = xTaskResumeAll();
\r
2649 return xYieldOccurred;
\r
2651 /*----------------------------------------------------------*/
\r
2653 #if ( INCLUDE_xTaskAbortDelay == 1 )
\r
2655 BaseType_t xTaskAbortDelay( TaskHandle_t xTask )
\r
2657 TCB_t * pxTCB = xTask;
\r
2658 BaseType_t xReturn;
\r
2660 configASSERT( pxTCB );
\r
2662 vTaskSuspendAll();
\r
2664 /* A task can only be prematurely removed from the Blocked state if
\r
2665 * it is actually in the Blocked state. */
\r
2666 if( eTaskGetState( xTask ) == eBlocked )
\r
2670 /* Remove the reference to the task from the blocked list. An
\r
2671 * interrupt won't touch the xStateListItem because the
\r
2672 * scheduler is suspended. */
\r
2673 ( void ) uxListRemove( &( pxTCB->xStateListItem ) );
\r
2675 /* Is the task waiting on an event also? If so remove it from
\r
2676 * the event list too. Interrupts can touch the event list item,
\r
2677 * even though the scheduler is suspended, so a critical section
\r
2679 taskENTER_CRITICAL();
\r
2681 if( listLIST_ITEM_CONTAINER( &( pxTCB->xEventListItem ) ) != NULL )
\r
2683 ( void ) uxListRemove( &( pxTCB->xEventListItem ) );
\r
2685 /* This lets the task know it was forcibly removed from the
\r
2686 * blocked state so it should not re-evaluate its block time and
\r
2687 * then block again. */
\r
2688 pxTCB->ucDelayAborted = pdTRUE;
\r
2692 mtCOVERAGE_TEST_MARKER();
\r
2695 taskEXIT_CRITICAL();
\r
2697 /* Place the unblocked task into the appropriate ready list. */
\r
2698 prvAddTaskToReadyList( pxTCB );
\r
2700 /* A task being unblocked cannot cause an immediate context
\r
2701 * switch if preemption is turned off. */
\r
2702 #if ( configUSE_PREEMPTION == 1 )
\r
2704 /* Preemption is on, but a context switch should only be
\r
2705 * performed if the unblocked task has a priority that is
\r
2706 * higher than the currently executing task. */
\r
2707 if( pxTCB->uxPriority > pxCurrentTCB->uxPriority )
\r
2709 /* Pend the yield to be performed when the scheduler
\r
2710 * is unsuspended. */
\r
2711 xYieldPending = pdTRUE;
\r
2715 mtCOVERAGE_TEST_MARKER();
\r
2718 #endif /* configUSE_PREEMPTION */
\r
2725 ( void ) xTaskResumeAll();
\r
2730 #endif /* INCLUDE_xTaskAbortDelay */
\r
2731 /*----------------------------------------------------------*/
\r
2733 BaseType_t xTaskIncrementTick( void )
\r
2736 TickType_t xItemValue;
\r
2737 BaseType_t xSwitchRequired = pdFALSE;
\r
2739 /* Called by the portable layer each time a tick interrupt occurs.
\r
2740 * Increments the tick then checks to see if the new tick value will cause any
\r
2741 * tasks to be unblocked. */
\r
2742 traceTASK_INCREMENT_TICK( xTickCount );
\r
2744 if( uxSchedulerSuspended == ( UBaseType_t ) pdFALSE )
\r
2746 /* Minor optimisation. The tick count cannot change in this
\r
2748 const TickType_t xConstTickCount = xTickCount + ( TickType_t ) 1;
\r
2750 /* Increment the RTOS tick, switching the delayed and overflowed
\r
2751 * delayed lists if it wraps to 0. */
\r
2752 xTickCount = xConstTickCount;
\r
2754 if( xConstTickCount == ( TickType_t ) 0U ) /*lint !e774 'if' does not always evaluate to false as it is looking for an overflow. */
\r
2756 taskSWITCH_DELAYED_LISTS();
\r
2760 mtCOVERAGE_TEST_MARKER();
\r
2763 /* See if this tick has made a timeout expire. Tasks are stored in
\r
2764 * the queue in the order of their wake time - meaning once one task
\r
2765 * has been found whose block time has not expired there is no need to
\r
2766 * look any further down the list. */
\r
2767 if( xConstTickCount >= xNextTaskUnblockTime )
\r
2771 if( listLIST_IS_EMPTY( pxDelayedTaskList ) != pdFALSE )
\r
2773 /* The delayed list is empty. Set xNextTaskUnblockTime
\r
2774 * to the maximum possible value so it is extremely
\r
2775 * unlikely that the
\r
2776 * if( xTickCount >= xNextTaskUnblockTime ) test will pass
\r
2777 * next time through. */
\r
2778 xNextTaskUnblockTime = portMAX_DELAY; /*lint !e961 MISRA exception as the casts are only redundant for some ports. */
\r
2783 /* The delayed list is not empty, get the value of the
\r
2784 * item at the head of the delayed list. This is the time
\r
2785 * at which the task at the head of the delayed list must
\r
2786 * be removed from the Blocked state. */
\r
2787 pxTCB = listGET_OWNER_OF_HEAD_ENTRY( pxDelayedTaskList ); /*lint !e9079 void * is used as this macro is used with timers and co-routines too. Alignment is known to be fine as the type of the pointer stored and retrieved is the same. */
\r
2788 xItemValue = listGET_LIST_ITEM_VALUE( &( pxTCB->xStateListItem ) );
\r
2790 if( xConstTickCount < xItemValue )
\r
2792 /* It is not time to unblock this item yet, but the
\r
2793 * item value is the time at which the task at the head
\r
2794 * of the blocked list must be removed from the Blocked
\r
2795 * state - so record the item value in
\r
2796 * xNextTaskUnblockTime. */
\r
2797 xNextTaskUnblockTime = xItemValue;
\r
2798 break; /*lint !e9011 Code structure here is deemed easier to understand with multiple breaks. */
\r
2802 mtCOVERAGE_TEST_MARKER();
\r
2805 /* It is time to remove the item from the Blocked state. */
\r
2806 listREMOVE_ITEM( &( pxTCB->xStateListItem ) );
\r
2808 /* Is the task waiting on an event also? If so remove
\r
2809 * it from the event list. */
\r
2810 if( listLIST_ITEM_CONTAINER( &( pxTCB->xEventListItem ) ) != NULL )
\r
2812 listREMOVE_ITEM( &( pxTCB->xEventListItem ) );
\r
2816 mtCOVERAGE_TEST_MARKER();
\r
2819 /* Place the unblocked task into the appropriate ready
\r
2821 prvAddTaskToReadyList( pxTCB );
\r
2823 /* A task being unblocked cannot cause an immediate
\r
2824 * context switch if preemption is turned off. */
\r
2825 #if ( configUSE_PREEMPTION == 1 )
\r
2827 /* Preemption is on, but a context switch should
\r
2828 * only be performed if the unblocked task has a
\r
2829 * priority that is equal to or higher than the
\r
2830 * currently executing task. */
\r
2831 if( pxTCB->uxPriority >= pxCurrentTCB->uxPriority )
\r
2833 xSwitchRequired = pdTRUE;
\r
2837 mtCOVERAGE_TEST_MARKER();
\r
2840 #endif /* configUSE_PREEMPTION */
\r
2845 /* Tasks of equal priority to the currently running task will share
\r
2846 * processing time (time slice) if preemption is on, and the application
\r
2847 * writer has not explicitly turned time slicing off. */
\r
2848 #if ( ( configUSE_PREEMPTION == 1 ) && ( configUSE_TIME_SLICING == 1 ) )
\r
2850 if( listCURRENT_LIST_LENGTH( &( pxReadyTasksLists[ pxCurrentTCB->uxPriority ] ) ) > ( UBaseType_t ) 1 )
\r
2852 xSwitchRequired = pdTRUE;
\r
2856 mtCOVERAGE_TEST_MARKER();
\r
2859 #endif /* ( ( configUSE_PREEMPTION == 1 ) && ( configUSE_TIME_SLICING == 1 ) ) */
\r
2861 #if ( configUSE_TICK_HOOK == 1 )
\r
2863 /* Guard against the tick hook being called when the pended tick
\r
2864 * count is being unwound (when the scheduler is being unlocked). */
\r
2865 if( xPendedTicks == ( TickType_t ) 0 )
\r
2867 vApplicationTickHook();
\r
2871 mtCOVERAGE_TEST_MARKER();
\r
2874 #endif /* configUSE_TICK_HOOK */
\r
2876 #if ( configUSE_PREEMPTION == 1 )
\r
2878 if( xYieldPending != pdFALSE )
\r
2880 xSwitchRequired = pdTRUE;
\r
2884 mtCOVERAGE_TEST_MARKER();
\r
2887 #endif /* configUSE_PREEMPTION */
\r
2893 /* The tick hook gets called at regular intervals, even if the
\r
2894 * scheduler is locked. */
\r
2895 #if ( configUSE_TICK_HOOK == 1 )
\r
2897 vApplicationTickHook();
\r
2902 return xSwitchRequired;
\r
2904 /*-----------------------------------------------------------*/
\r
2906 #if ( configUSE_APPLICATION_TASK_TAG == 1 )
\r
2908 void vTaskSetApplicationTaskTag( TaskHandle_t xTask,
\r
2909 TaskHookFunction_t pxHookFunction )
\r
2913 /* If xTask is NULL then it is the task hook of the calling task that is
\r
2915 if( xTask == NULL )
\r
2917 xTCB = ( TCB_t * ) pxCurrentTCB;
\r
2924 /* Save the hook function in the TCB. A critical section is required as
\r
2925 * the value can be accessed from an interrupt. */
\r
2926 taskENTER_CRITICAL();
\r
2928 xTCB->pxTaskTag = pxHookFunction;
\r
2930 taskEXIT_CRITICAL();
\r
2933 #endif /* configUSE_APPLICATION_TASK_TAG */
\r
2934 /*-----------------------------------------------------------*/
\r
2936 #if ( configUSE_APPLICATION_TASK_TAG == 1 )
\r
2938 TaskHookFunction_t xTaskGetApplicationTaskTag( TaskHandle_t xTask )
\r
2941 TaskHookFunction_t xReturn;
\r
2943 /* If xTask is NULL then set the calling task's hook. */
\r
2944 pxTCB = prvGetTCBFromHandle( xTask );
\r
2946 /* Save the hook function in the TCB. A critical section is required as
\r
2947 * the value can be accessed from an interrupt. */
\r
2948 taskENTER_CRITICAL();
\r
2950 xReturn = pxTCB->pxTaskTag;
\r
2952 taskEXIT_CRITICAL();
\r
2957 #endif /* configUSE_APPLICATION_TASK_TAG */
\r
2958 /*-----------------------------------------------------------*/
\r
2960 #if ( configUSE_APPLICATION_TASK_TAG == 1 )
\r
2962 TaskHookFunction_t xTaskGetApplicationTaskTagFromISR( TaskHandle_t xTask )
\r
2965 TaskHookFunction_t xReturn;
\r
2966 UBaseType_t uxSavedInterruptStatus;
\r
2968 /* If xTask is NULL then set the calling task's hook. */
\r
2969 pxTCB = prvGetTCBFromHandle( xTask );
\r
2971 /* Save the hook function in the TCB. A critical section is required as
\r
2972 * the value can be accessed from an interrupt. */
\r
2973 uxSavedInterruptStatus = portSET_INTERRUPT_MASK_FROM_ISR();
\r
2975 xReturn = pxTCB->pxTaskTag;
\r
2977 portCLEAR_INTERRUPT_MASK_FROM_ISR( uxSavedInterruptStatus );
\r
2982 #endif /* configUSE_APPLICATION_TASK_TAG */
\r
2983 /*-----------------------------------------------------------*/
\r
2985 #if ( configUSE_APPLICATION_TASK_TAG == 1 )
\r
2987 BaseType_t xTaskCallApplicationTaskHook( TaskHandle_t xTask,
\r
2988 void * pvParameter )
\r
2991 BaseType_t xReturn;
\r
2993 /* If xTask is NULL then we are calling our own task hook. */
\r
2994 if( xTask == NULL )
\r
2996 xTCB = pxCurrentTCB;
\r
3003 if( xTCB->pxTaskTag != NULL )
\r
3005 xReturn = xTCB->pxTaskTag( pvParameter );
\r
3015 #endif /* configUSE_APPLICATION_TASK_TAG */
\r
3016 /*-----------------------------------------------------------*/
\r
3018 void vTaskSwitchContext( void )
\r
3020 if( uxSchedulerSuspended != ( UBaseType_t ) pdFALSE )
\r
3022 /* The scheduler is currently suspended - do not allow a context
\r
3024 xYieldPending = pdTRUE;
\r
3028 xYieldPending = pdFALSE;
\r
3029 traceTASK_SWITCHED_OUT();
\r
3031 #if ( configGENERATE_RUN_TIME_STATS == 1 )
\r
3033 #ifdef portALT_GET_RUN_TIME_COUNTER_VALUE
\r
3034 portALT_GET_RUN_TIME_COUNTER_VALUE( ulTotalRunTime );
\r
3036 ulTotalRunTime = portGET_RUN_TIME_COUNTER_VALUE();
\r
3039 /* Add the amount of time the task has been running to the
\r
3040 * accumulated time so far. The time the task started running was
\r
3041 * stored in ulTaskSwitchedInTime. Note that there is no overflow
\r
3042 * protection here so count values are only valid until the timer
\r
3043 * overflows. The guard against negative values is to protect
\r
3044 * against suspect run time stat counter implementations - which
\r
3045 * are provided by the application, not the kernel. */
\r
3046 if( ulTotalRunTime > ulTaskSwitchedInTime )
\r
3048 pxCurrentTCB->ulRunTimeCounter += ( ulTotalRunTime - ulTaskSwitchedInTime );
\r
3052 mtCOVERAGE_TEST_MARKER();
\r
3055 ulTaskSwitchedInTime = ulTotalRunTime;
\r
3057 #endif /* configGENERATE_RUN_TIME_STATS */
\r
3059 /* Check for stack overflow, if configured. */
\r
3060 taskCHECK_FOR_STACK_OVERFLOW();
\r
3062 /* Before the currently running task is switched out, save its errno. */
\r
3063 #if ( configUSE_POSIX_ERRNO == 1 )
\r
3065 pxCurrentTCB->iTaskErrno = FreeRTOS_errno;
\r
3069 /* Select a new task to run using either the generic C or port
\r
3070 * optimised asm code. */
\r
3071 taskSELECT_HIGHEST_PRIORITY_TASK(); /*lint !e9079 void * is used as this macro is used with timers and co-routines too. Alignment is known to be fine as the type of the pointer stored and retrieved is the same. */
\r
3072 traceTASK_SWITCHED_IN();
\r
3074 /* After the new task is switched in, update the global errno. */
\r
3075 #if ( configUSE_POSIX_ERRNO == 1 )
\r
3077 FreeRTOS_errno = pxCurrentTCB->iTaskErrno;
\r
3081 #if ( configUSE_NEWLIB_REENTRANT == 1 )
\r
3083 /* Switch Newlib's _impure_ptr variable to point to the _reent
\r
3084 * structure specific to this task.
\r
3085 * See the third party link http://www.nadler.com/embedded/newlibAndFreeRTOS.html
\r
3086 * for additional information. */
\r
3087 _impure_ptr = &( pxCurrentTCB->xNewLib_reent );
\r
3089 #endif /* configUSE_NEWLIB_REENTRANT */
\r
3092 /*-----------------------------------------------------------*/
\r
3094 void vTaskPlaceOnEventList( List_t * const pxEventList,
\r
3095 const TickType_t xTicksToWait )
\r
3097 configASSERT( pxEventList );
\r
3099 /* THIS FUNCTION MUST BE CALLED WITH EITHER INTERRUPTS DISABLED OR THE
\r
3100 * SCHEDULER SUSPENDED AND THE QUEUE BEING ACCESSED LOCKED. */
\r
3102 /* Place the event list item of the TCB in the appropriate event list.
\r
3103 * This is placed in the list in priority order so the highest priority task
\r
3104 * is the first to be woken by the event.
\r
3106 * Note: Lists are sorted in ascending order by ListItem_t.xItemValue.
\r
3107 * Normally, the xItemValue of a TCB's ListItem_t members is:
\r
3108 * xItemValue = ( configMAX_PRIORITIES - uxPriority )
\r
3109 * Therefore, the event list is sorted in descending priority order.
\r
3111 * The queue that contains the event list is locked, preventing
\r
3112 * simultaneous access from interrupts. */
\r
3113 vListInsert( pxEventList, &( pxCurrentTCB->xEventListItem ) );
\r
3115 prvAddCurrentTaskToDelayedList( xTicksToWait, pdTRUE );
\r
3117 /*-----------------------------------------------------------*/
\r
3119 void vTaskPlaceOnUnorderedEventList( List_t * pxEventList,
\r
3120 const TickType_t xItemValue,
\r
3121 const TickType_t xTicksToWait )
\r
3123 configASSERT( pxEventList );
\r
3125 /* THIS FUNCTION MUST BE CALLED WITH THE SCHEDULER SUSPENDED. It is used by
\r
3126 * the event groups implementation. */
\r
3127 configASSERT( uxSchedulerSuspended != 0 );
\r
3129 /* Store the item value in the event list item. It is safe to access the
\r
3130 * event list item here as interrupts won't access the event list item of a
\r
3131 * task that is not in the Blocked state. */
\r
3132 listSET_LIST_ITEM_VALUE( &( pxCurrentTCB->xEventListItem ), xItemValue | taskEVENT_LIST_ITEM_VALUE_IN_USE );
\r
3134 /* Place the event list item of the TCB at the end of the appropriate event
\r
3135 * list. It is safe to access the event list here because it is part of an
\r
3136 * event group implementation - and interrupts don't access event groups
\r
3137 * directly (instead they access them indirectly by pending function calls to
\r
3138 * the task level). */
\r
3139 listINSERT_END( pxEventList, &( pxCurrentTCB->xEventListItem ) );
\r
3141 prvAddCurrentTaskToDelayedList( xTicksToWait, pdTRUE );
\r
3143 /*-----------------------------------------------------------*/
\r
3145 #if ( configUSE_TIMERS == 1 )
\r
3147 void vTaskPlaceOnEventListRestricted( List_t * const pxEventList,
\r
3148 TickType_t xTicksToWait,
\r
3149 const BaseType_t xWaitIndefinitely )
\r
3151 configASSERT( pxEventList );
\r
3153 /* This function should not be called by application code hence the
\r
3154 * 'Restricted' in its name. It is not part of the public API. It is
\r
3155 * designed for use by kernel code, and has special calling requirements -
\r
3156 * it should be called with the scheduler suspended. */
\r
3159 /* Place the event list item of the TCB in the appropriate event list.
\r
3160 * In this case it is assume that this is the only task that is going to
\r
3161 * be waiting on this event list, so the faster vListInsertEnd() function
\r
3162 * can be used in place of vListInsert. */
\r
3163 listINSERT_END( pxEventList, &( pxCurrentTCB->xEventListItem ) );
\r
3165 /* If the task should block indefinitely then set the block time to a
\r
3166 * value that will be recognised as an indefinite delay inside the
\r
3167 * prvAddCurrentTaskToDelayedList() function. */
\r
3168 if( xWaitIndefinitely != pdFALSE )
\r
3170 xTicksToWait = portMAX_DELAY;
\r
3173 traceTASK_DELAY_UNTIL( ( xTickCount + xTicksToWait ) );
\r
3174 prvAddCurrentTaskToDelayedList( xTicksToWait, xWaitIndefinitely );
\r
3177 #endif /* configUSE_TIMERS */
\r
3178 /*-----------------------------------------------------------*/
\r
3180 BaseType_t xTaskRemoveFromEventList( const List_t * const pxEventList )
\r
3182 TCB_t * pxUnblockedTCB;
\r
3183 BaseType_t xReturn;
\r
3185 /* THIS FUNCTION MUST BE CALLED FROM A CRITICAL SECTION. It can also be
\r
3186 * called from a critical section within an ISR. */
\r
3188 /* The event list is sorted in priority order, so the first in the list can
\r
3189 * be removed as it is known to be the highest priority. Remove the TCB from
\r
3190 * the delayed list, and add it to the ready list.
\r
3192 * If an event is for a queue that is locked then this function will never
\r
3193 * get called - the lock count on the queue will get modified instead. This
\r
3194 * means exclusive access to the event list is guaranteed here.
\r
3196 * This function assumes that a check has already been made to ensure that
\r
3197 * pxEventList is not empty. */
\r
3198 pxUnblockedTCB = listGET_OWNER_OF_HEAD_ENTRY( pxEventList ); /*lint !e9079 void * is used as this macro is used with timers and co-routines too. Alignment is known to be fine as the type of the pointer stored and retrieved is the same. */
\r
3199 configASSERT( pxUnblockedTCB );
\r
3200 listREMOVE_ITEM( &( pxUnblockedTCB->xEventListItem ) );
\r
3202 if( uxSchedulerSuspended == ( UBaseType_t ) pdFALSE )
\r
3204 listREMOVE_ITEM( &( pxUnblockedTCB->xStateListItem ) );
\r
3205 prvAddTaskToReadyList( pxUnblockedTCB );
\r
3207 #if ( configUSE_TICKLESS_IDLE != 0 )
\r
3209 /* If a task is blocked on a kernel object then xNextTaskUnblockTime
\r
3210 * might be set to the blocked task's time out time. If the task is
\r
3211 * unblocked for a reason other than a timeout xNextTaskUnblockTime is
\r
3212 * normally left unchanged, because it is automatically reset to a new
\r
3213 * value when the tick count equals xNextTaskUnblockTime. However if
\r
3214 * tickless idling is used it might be more important to enter sleep mode
\r
3215 * at the earliest possible time - so reset xNextTaskUnblockTime here to
\r
3216 * ensure it is updated at the earliest possible time. */
\r
3217 prvResetNextTaskUnblockTime();
\r
3223 /* The delayed and ready lists cannot be accessed, so hold this task
\r
3224 * pending until the scheduler is resumed. */
\r
3225 listINSERT_END( &( xPendingReadyList ), &( pxUnblockedTCB->xEventListItem ) );
\r
3228 if( pxUnblockedTCB->uxPriority > pxCurrentTCB->uxPriority )
\r
3230 /* Return true if the task removed from the event list has a higher
\r
3231 * priority than the calling task. This allows the calling task to know if
\r
3232 * it should force a context switch now. */
\r
3235 /* Mark that a yield is pending in case the user is not using the
\r
3236 * "xHigherPriorityTaskWoken" parameter to an ISR safe FreeRTOS function. */
\r
3237 xYieldPending = pdTRUE;
\r
3241 xReturn = pdFALSE;
\r
3246 /*-----------------------------------------------------------*/
\r
3248 void vTaskRemoveFromUnorderedEventList( ListItem_t * pxEventListItem,
\r
3249 const TickType_t xItemValue )
\r
3251 TCB_t * pxUnblockedTCB;
\r
3253 /* THIS FUNCTION MUST BE CALLED WITH THE SCHEDULER SUSPENDED. It is used by
\r
3254 * the event flags implementation. */
\r
3255 configASSERT( uxSchedulerSuspended != pdFALSE );
\r
3257 /* Store the new item value in the event list. */
\r
3258 listSET_LIST_ITEM_VALUE( pxEventListItem, xItemValue | taskEVENT_LIST_ITEM_VALUE_IN_USE );
\r
3260 /* Remove the event list form the event flag. Interrupts do not access
\r
3262 pxUnblockedTCB = listGET_LIST_ITEM_OWNER( pxEventListItem ); /*lint !e9079 void * is used as this macro is used with timers and co-routines too. Alignment is known to be fine as the type of the pointer stored and retrieved is the same. */
\r
3263 configASSERT( pxUnblockedTCB );
\r
3264 listREMOVE_ITEM( pxEventListItem );
\r
3266 #if ( configUSE_TICKLESS_IDLE != 0 )
\r
3268 /* If a task is blocked on a kernel object then xNextTaskUnblockTime
\r
3269 * might be set to the blocked task's time out time. If the task is
\r
3270 * unblocked for a reason other than a timeout xNextTaskUnblockTime is
\r
3271 * normally left unchanged, because it is automatically reset to a new
\r
3272 * value when the tick count equals xNextTaskUnblockTime. However if
\r
3273 * tickless idling is used it might be more important to enter sleep mode
\r
3274 * at the earliest possible time - so reset xNextTaskUnblockTime here to
\r
3275 * ensure it is updated at the earliest possible time. */
\r
3276 prvResetNextTaskUnblockTime();
\r
3280 /* Remove the task from the delayed list and add it to the ready list. The
\r
3281 * scheduler is suspended so interrupts will not be accessing the ready
\r
3283 listREMOVE_ITEM( &( pxUnblockedTCB->xStateListItem ) );
\r
3284 prvAddTaskToReadyList( pxUnblockedTCB );
\r
3286 if( pxUnblockedTCB->uxPriority > pxCurrentTCB->uxPriority )
\r
3288 /* The unblocked task has a priority above that of the calling task, so
\r
3289 * a context switch is required. This function is called with the
\r
3290 * scheduler suspended so xYieldPending is set so the context switch
\r
3291 * occurs immediately that the scheduler is resumed (unsuspended). */
\r
3292 xYieldPending = pdTRUE;
\r
3295 /*-----------------------------------------------------------*/
\r
3297 void vTaskSetTimeOutState( TimeOut_t * const pxTimeOut )
\r
3299 configASSERT( pxTimeOut );
\r
3300 taskENTER_CRITICAL();
\r
3302 pxTimeOut->xOverflowCount = xNumOfOverflows;
\r
3303 pxTimeOut->xTimeOnEntering = xTickCount;
\r
3305 taskEXIT_CRITICAL();
\r
3307 /*-----------------------------------------------------------*/
\r
3309 void vTaskInternalSetTimeOutState( TimeOut_t * const pxTimeOut )
\r
3311 /* For internal use only as it does not use a critical section. */
\r
3312 pxTimeOut->xOverflowCount = xNumOfOverflows;
\r
3313 pxTimeOut->xTimeOnEntering = xTickCount;
\r
3315 /*-----------------------------------------------------------*/
\r
3317 BaseType_t xTaskCheckForTimeOut( TimeOut_t * const pxTimeOut,
\r
3318 TickType_t * const pxTicksToWait )
\r
3320 BaseType_t xReturn;
\r
3322 configASSERT( pxTimeOut );
\r
3323 configASSERT( pxTicksToWait );
\r
3325 taskENTER_CRITICAL();
\r
3327 /* Minor optimisation. The tick count cannot change in this block. */
\r
3328 const TickType_t xConstTickCount = xTickCount;
\r
3329 const TickType_t xElapsedTime = xConstTickCount - pxTimeOut->xTimeOnEntering;
\r
3331 #if ( INCLUDE_xTaskAbortDelay == 1 )
\r
3332 if( pxCurrentTCB->ucDelayAborted != ( uint8_t ) pdFALSE )
\r
3334 /* The delay was aborted, which is not the same as a time out,
\r
3335 * but has the same result. */
\r
3336 pxCurrentTCB->ucDelayAborted = pdFALSE;
\r
3342 #if ( INCLUDE_vTaskSuspend == 1 )
\r
3343 if( *pxTicksToWait == portMAX_DELAY )
\r
3345 /* If INCLUDE_vTaskSuspend is set to 1 and the block time
\r
3346 * specified is the maximum block time then the task should block
\r
3347 * indefinitely, and therefore never time out. */
\r
3348 xReturn = pdFALSE;
\r
3353 if( ( xNumOfOverflows != pxTimeOut->xOverflowCount ) && ( xConstTickCount >= pxTimeOut->xTimeOnEntering ) ) /*lint !e525 Indentation preferred as is to make code within pre-processor directives clearer. */
\r
3355 /* The tick count is greater than the time at which
\r
3356 * vTaskSetTimeout() was called, but has also overflowed since
\r
3357 * vTaskSetTimeOut() was called. It must have wrapped all the way
\r
3358 * around and gone past again. This passed since vTaskSetTimeout()
\r
3361 *pxTicksToWait = ( TickType_t ) 0;
\r
3363 else if( xElapsedTime < *pxTicksToWait ) /*lint !e961 Explicit casting is only redundant with some compilers, whereas others require it to prevent integer conversion errors. */
\r
3365 /* Not a genuine timeout. Adjust parameters for time remaining. */
\r
3366 *pxTicksToWait -= xElapsedTime;
\r
3367 vTaskInternalSetTimeOutState( pxTimeOut );
\r
3368 xReturn = pdFALSE;
\r
3372 *pxTicksToWait = ( TickType_t ) 0;
\r
3376 taskEXIT_CRITICAL();
\r
3380 /*-----------------------------------------------------------*/
\r
3382 void vTaskMissedYield( void )
\r
3384 xYieldPending = pdTRUE;
\r
3386 /*-----------------------------------------------------------*/
\r
3388 #if ( configUSE_TRACE_FACILITY == 1 )
\r
3390 UBaseType_t uxTaskGetTaskNumber( TaskHandle_t xTask )
\r
3392 UBaseType_t uxReturn;
\r
3393 TCB_t const * pxTCB;
\r
3395 if( xTask != NULL )
\r
3398 uxReturn = pxTCB->uxTaskNumber;
\r
3408 #endif /* configUSE_TRACE_FACILITY */
\r
3409 /*-----------------------------------------------------------*/
\r
3411 #if ( configUSE_TRACE_FACILITY == 1 )
\r
3413 void vTaskSetTaskNumber( TaskHandle_t xTask,
\r
3414 const UBaseType_t uxHandle )
\r
3418 if( xTask != NULL )
\r
3421 pxTCB->uxTaskNumber = uxHandle;
\r
3425 #endif /* configUSE_TRACE_FACILITY */
\r
3428 * -----------------------------------------------------------
\r
3430 * ----------------------------------------------------------
\r
3432 * The portTASK_FUNCTION() macro is used to allow port/compiler specific
\r
3433 * language extensions. The equivalent prototype for this function is:
\r
3435 * void prvIdleTask( void *pvParameters );
\r
3438 static portTASK_FUNCTION( prvIdleTask, pvParameters )
\r
3440 /* Stop warnings. */
\r
3441 ( void ) pvParameters;
\r
3443 /** THIS IS THE RTOS IDLE TASK - WHICH IS CREATED AUTOMATICALLY WHEN THE
\r
3444 * SCHEDULER IS STARTED. **/
\r
3446 /* In case a task that has a secure context deletes itself, in which case
\r
3447 * the idle task is responsible for deleting the task's secure context, if
\r
3449 portALLOCATE_SECURE_CONTEXT( configMINIMAL_SECURE_STACK_SIZE );
\r
3453 /* See if any tasks have deleted themselves - if so then the idle task
\r
3454 * is responsible for freeing the deleted task's TCB and stack. */
\r
3455 prvCheckTasksWaitingTermination();
\r
3457 #if ( configUSE_PREEMPTION == 0 )
\r
3459 /* If we are not using preemption we keep forcing a task switch to
\r
3460 * see if any other task has become available. If we are using
\r
3461 * preemption we don't need to do this as any task becoming available
\r
3462 * will automatically get the processor anyway. */
\r
3465 #endif /* configUSE_PREEMPTION */
\r
3467 #if ( ( configUSE_PREEMPTION == 1 ) && ( configIDLE_SHOULD_YIELD == 1 ) )
\r
3469 /* When using preemption tasks of equal priority will be
\r
3470 * timesliced. If a task that is sharing the idle priority is ready
\r
3471 * to run then the idle task should yield before the end of the
\r
3474 * A critical region is not required here as we are just reading from
\r
3475 * the list, and an occasional incorrect value will not matter. If
\r
3476 * the ready list at the idle priority contains more than one task
\r
3477 * then a task other than the idle task is ready to execute. */
\r
3478 if( listCURRENT_LIST_LENGTH( &( pxReadyTasksLists[ tskIDLE_PRIORITY ] ) ) > ( UBaseType_t ) 1 )
\r
3484 mtCOVERAGE_TEST_MARKER();
\r
3487 #endif /* ( ( configUSE_PREEMPTION == 1 ) && ( configIDLE_SHOULD_YIELD == 1 ) ) */
\r
3489 #if ( configUSE_IDLE_HOOK == 1 )
\r
3491 extern void vApplicationIdleHook( void );
\r
3493 /* Call the user defined function from within the idle task. This
\r
3494 * allows the application designer to add background functionality
\r
3495 * without the overhead of a separate task.
\r
3496 * NOTE: vApplicationIdleHook() MUST NOT, UNDER ANY CIRCUMSTANCES,
\r
3497 * CALL A FUNCTION THAT MIGHT BLOCK. */
\r
3498 vApplicationIdleHook();
\r
3500 #endif /* configUSE_IDLE_HOOK */
\r
3502 /* This conditional compilation should use inequality to 0, not equality
\r
3503 * to 1. This is to ensure portSUPPRESS_TICKS_AND_SLEEP() is called when
\r
3504 * user defined low power mode implementations require
\r
3505 * configUSE_TICKLESS_IDLE to be set to a value other than 1. */
\r
3506 #if ( configUSE_TICKLESS_IDLE != 0 )
\r
3508 TickType_t xExpectedIdleTime;
\r
3510 /* It is not desirable to suspend then resume the scheduler on
\r
3511 * each iteration of the idle task. Therefore, a preliminary
\r
3512 * test of the expected idle time is performed without the
\r
3513 * scheduler suspended. The result here is not necessarily
\r
3515 xExpectedIdleTime = prvGetExpectedIdleTime();
\r
3517 if( xExpectedIdleTime >= configEXPECTED_IDLE_TIME_BEFORE_SLEEP )
\r
3519 vTaskSuspendAll();
\r
3521 /* Now the scheduler is suspended, the expected idle
\r
3522 * time can be sampled again, and this time its value can
\r
3524 configASSERT( xNextTaskUnblockTime >= xTickCount );
\r
3525 xExpectedIdleTime = prvGetExpectedIdleTime();
\r
3527 /* Define the following macro to set xExpectedIdleTime to 0
\r
3528 * if the application does not want
\r
3529 * portSUPPRESS_TICKS_AND_SLEEP() to be called. */
\r
3530 configPRE_SUPPRESS_TICKS_AND_SLEEP_PROCESSING( xExpectedIdleTime );
\r
3532 if( xExpectedIdleTime >= configEXPECTED_IDLE_TIME_BEFORE_SLEEP )
\r
3534 traceLOW_POWER_IDLE_BEGIN();
\r
3535 portSUPPRESS_TICKS_AND_SLEEP( xExpectedIdleTime );
\r
3536 traceLOW_POWER_IDLE_END();
\r
3540 mtCOVERAGE_TEST_MARKER();
\r
3543 ( void ) xTaskResumeAll();
\r
3547 mtCOVERAGE_TEST_MARKER();
\r
3550 #endif /* configUSE_TICKLESS_IDLE */
\r
3553 /*-----------------------------------------------------------*/
\r
3555 #if ( configUSE_TICKLESS_IDLE != 0 )
\r
3557 eSleepModeStatus eTaskConfirmSleepModeStatus( void )
\r
3559 #if ( INCLUDE_vTaskSuspend == 1 )
\r
3560 /* The idle task exists in addition to the application tasks. */
\r
3561 const UBaseType_t uxNonApplicationTasks = 1;
\r
3562 #endif /* INCLUDE_vTaskSuspend */
\r
3564 eSleepModeStatus eReturn = eStandardSleep;
\r
3566 /* This function must be called from a critical section. */
\r
3568 if( listCURRENT_LIST_LENGTH( &xPendingReadyList ) != 0 )
\r
3570 /* A task was made ready while the scheduler was suspended. */
\r
3571 eReturn = eAbortSleep;
\r
3573 else if( xYieldPending != pdFALSE )
\r
3575 /* A yield was pended while the scheduler was suspended. */
\r
3576 eReturn = eAbortSleep;
\r
3578 else if( xPendedTicks != 0 )
\r
3580 /* A tick interrupt has already occurred but was held pending
\r
3581 * because the scheduler is suspended. */
\r
3582 eReturn = eAbortSleep;
\r
3585 #if ( INCLUDE_vTaskSuspend == 1 )
\r
3586 else if( listCURRENT_LIST_LENGTH( &xSuspendedTaskList ) == ( uxCurrentNumberOfTasks - uxNonApplicationTasks ) )
\r
3588 /* If all the tasks are in the suspended list (which might mean they
\r
3589 * have an infinite block time rather than actually being suspended)
\r
3590 * then it is safe to turn all clocks off and just wait for external
\r
3592 eReturn = eNoTasksWaitingTimeout;
\r
3594 #endif /* INCLUDE_vTaskSuspend */
\r
3597 mtCOVERAGE_TEST_MARKER();
\r
3603 #endif /* configUSE_TICKLESS_IDLE */
\r
3604 /*-----------------------------------------------------------*/
\r
3606 #if ( configNUM_THREAD_LOCAL_STORAGE_POINTERS != 0 )
\r
3608 void vTaskSetThreadLocalStoragePointer( TaskHandle_t xTaskToSet,
\r
3609 BaseType_t xIndex,
\r
3614 if( xIndex < configNUM_THREAD_LOCAL_STORAGE_POINTERS )
\r
3616 pxTCB = prvGetTCBFromHandle( xTaskToSet );
\r
3617 configASSERT( pxTCB != NULL );
\r
3618 pxTCB->pvThreadLocalStoragePointers[ xIndex ] = pvValue;
\r
3622 #endif /* configNUM_THREAD_LOCAL_STORAGE_POINTERS */
\r
3623 /*-----------------------------------------------------------*/
\r
3625 #if ( configNUM_THREAD_LOCAL_STORAGE_POINTERS != 0 )
\r
3627 void * pvTaskGetThreadLocalStoragePointer( TaskHandle_t xTaskToQuery,
\r
3628 BaseType_t xIndex )
\r
3630 void * pvReturn = NULL;
\r
3633 if( xIndex < configNUM_THREAD_LOCAL_STORAGE_POINTERS )
\r
3635 pxTCB = prvGetTCBFromHandle( xTaskToQuery );
\r
3636 pvReturn = pxTCB->pvThreadLocalStoragePointers[ xIndex ];
\r
3646 #endif /* configNUM_THREAD_LOCAL_STORAGE_POINTERS */
\r
3647 /*-----------------------------------------------------------*/
\r
3649 #if ( portUSING_MPU_WRAPPERS == 1 )
\r
3651 void vTaskAllocateMPURegions( TaskHandle_t xTaskToModify,
\r
3652 const MemoryRegion_t * const xRegions )
\r
3656 /* If null is passed in here then we are modifying the MPU settings of
\r
3657 * the calling task. */
\r
3658 pxTCB = prvGetTCBFromHandle( xTaskToModify );
\r
3660 vPortStoreTaskMPUSettings( &( pxTCB->xMPUSettings ), xRegions, NULL, 0 );
\r
3663 #endif /* portUSING_MPU_WRAPPERS */
\r
3664 /*-----------------------------------------------------------*/
\r
3666 static void prvInitialiseTaskLists( void )
\r
3668 UBaseType_t uxPriority;
\r
3670 for( uxPriority = ( UBaseType_t ) 0U; uxPriority < ( UBaseType_t ) configMAX_PRIORITIES; uxPriority++ )
\r
3672 vListInitialise( &( pxReadyTasksLists[ uxPriority ] ) );
\r
3675 vListInitialise( &xDelayedTaskList1 );
\r
3676 vListInitialise( &xDelayedTaskList2 );
\r
3677 vListInitialise( &xPendingReadyList );
\r
3679 #if ( INCLUDE_vTaskDelete == 1 )
\r
3681 vListInitialise( &xTasksWaitingTermination );
\r
3683 #endif /* INCLUDE_vTaskDelete */
\r
3685 #if ( INCLUDE_vTaskSuspend == 1 )
\r
3687 vListInitialise( &xSuspendedTaskList );
\r
3689 #endif /* INCLUDE_vTaskSuspend */
\r
3691 /* Start with pxDelayedTaskList using list1 and the pxOverflowDelayedTaskList
\r
3693 pxDelayedTaskList = &xDelayedTaskList1;
\r
3694 pxOverflowDelayedTaskList = &xDelayedTaskList2;
\r
3696 /*-----------------------------------------------------------*/
\r
3698 static void prvCheckTasksWaitingTermination( void )
\r
3700 /** THIS FUNCTION IS CALLED FROM THE RTOS IDLE TASK **/
\r
3702 #if ( INCLUDE_vTaskDelete == 1 )
\r
3706 /* uxDeletedTasksWaitingCleanUp is used to prevent taskENTER_CRITICAL()
\r
3707 * being called too often in the idle task. */
\r
3708 while( uxDeletedTasksWaitingCleanUp > ( UBaseType_t ) 0U )
\r
3710 taskENTER_CRITICAL();
\r
3712 pxTCB = listGET_OWNER_OF_HEAD_ENTRY( ( &xTasksWaitingTermination ) ); /*lint !e9079 void * is used as this macro is used with timers and co-routines too. Alignment is known to be fine as the type of the pointer stored and retrieved is the same. */
\r
3713 ( void ) uxListRemove( &( pxTCB->xStateListItem ) );
\r
3714 --uxCurrentNumberOfTasks;
\r
3715 --uxDeletedTasksWaitingCleanUp;
\r
3717 taskEXIT_CRITICAL();
\r
3719 prvDeleteTCB( pxTCB );
\r
3722 #endif /* INCLUDE_vTaskDelete */
\r
3724 /*-----------------------------------------------------------*/
\r
3726 #if ( configUSE_TRACE_FACILITY == 1 )
\r
3728 void vTaskGetInfo( TaskHandle_t xTask,
\r
3729 TaskStatus_t * pxTaskStatus,
\r
3730 BaseType_t xGetFreeStackSpace,
\r
3731 eTaskState eState )
\r
3735 /* xTask is NULL then get the state of the calling task. */
\r
3736 pxTCB = prvGetTCBFromHandle( xTask );
\r
3738 pxTaskStatus->xHandle = ( TaskHandle_t ) pxTCB;
\r
3739 pxTaskStatus->pcTaskName = ( const char * ) &( pxTCB->pcTaskName[ 0 ] );
\r
3740 pxTaskStatus->uxCurrentPriority = pxTCB->uxPriority;
\r
3741 pxTaskStatus->pxStackBase = pxTCB->pxStack;
\r
3742 #if ( ( portSTACK_GROWTH > 0 ) && ( configRECORD_STACK_HIGH_ADDRESS == 1 ) )
\r
3743 pxTaskStatus->pxTopOfStack = pxTCB->pxTopOfStack;
\r
3744 pxTaskStatus->pxEndOfStack = pxTCB->pxEndOfStack;
\r
3746 pxTaskStatus->xTaskNumber = pxTCB->uxTCBNumber;
\r
3748 #if ( configUSE_MUTEXES == 1 )
\r
3750 pxTaskStatus->uxBasePriority = pxTCB->uxBasePriority;
\r
3754 pxTaskStatus->uxBasePriority = 0;
\r
3758 #if ( configGENERATE_RUN_TIME_STATS == 1 )
\r
3760 pxTaskStatus->ulRunTimeCounter = pxTCB->ulRunTimeCounter;
\r
3764 pxTaskStatus->ulRunTimeCounter = ( configRUN_TIME_COUNTER_TYPE ) 0;
\r
3768 /* Obtaining the task state is a little fiddly, so is only done if the
\r
3769 * value of eState passed into this function is eInvalid - otherwise the
\r
3770 * state is just set to whatever is passed in. */
\r
3771 if( eState != eInvalid )
\r
3773 if( pxTCB == pxCurrentTCB )
\r
3775 pxTaskStatus->eCurrentState = eRunning;
\r
3779 pxTaskStatus->eCurrentState = eState;
\r
3781 #if ( INCLUDE_vTaskSuspend == 1 )
\r
3783 /* If the task is in the suspended list then there is a
\r
3784 * chance it is actually just blocked indefinitely - so really
\r
3785 * it should be reported as being in the Blocked state. */
\r
3786 if( eState == eSuspended )
\r
3788 vTaskSuspendAll();
\r
3790 if( listLIST_ITEM_CONTAINER( &( pxTCB->xEventListItem ) ) != NULL )
\r
3792 pxTaskStatus->eCurrentState = eBlocked;
\r
3795 ( void ) xTaskResumeAll();
\r
3798 #endif /* INCLUDE_vTaskSuspend */
\r
3803 pxTaskStatus->eCurrentState = eTaskGetState( pxTCB );
\r
3806 /* Obtaining the stack space takes some time, so the xGetFreeStackSpace
\r
3807 * parameter is provided to allow it to be skipped. */
\r
3808 if( xGetFreeStackSpace != pdFALSE )
\r
3810 #if ( portSTACK_GROWTH > 0 )
\r
3812 pxTaskStatus->usStackHighWaterMark = prvTaskCheckFreeStackSpace( ( uint8_t * ) pxTCB->pxEndOfStack );
\r
3816 pxTaskStatus->usStackHighWaterMark = prvTaskCheckFreeStackSpace( ( uint8_t * ) pxTCB->pxStack );
\r
3822 pxTaskStatus->usStackHighWaterMark = 0;
\r
3826 #endif /* configUSE_TRACE_FACILITY */
\r
3827 /*-----------------------------------------------------------*/
\r
3829 #if ( configUSE_TRACE_FACILITY == 1 )
\r
3831 static UBaseType_t prvListTasksWithinSingleList( TaskStatus_t * pxTaskStatusArray,
\r
3833 eTaskState eState )
\r
3835 configLIST_VOLATILE TCB_t * pxNextTCB, * pxFirstTCB;
\r
3836 UBaseType_t uxTask = 0;
\r
3838 if( listCURRENT_LIST_LENGTH( pxList ) > ( UBaseType_t ) 0 )
\r
3840 listGET_OWNER_OF_NEXT_ENTRY( pxFirstTCB, pxList ); /*lint !e9079 void * is used as this macro is used with timers and co-routines too. Alignment is known to be fine as the type of the pointer stored and retrieved is the same. */
\r
3842 /* Populate an TaskStatus_t structure within the
\r
3843 * pxTaskStatusArray array for each task that is referenced from
\r
3844 * pxList. See the definition of TaskStatus_t in task.h for the
\r
3845 * meaning of each TaskStatus_t structure member. */
\r
3848 listGET_OWNER_OF_NEXT_ENTRY( pxNextTCB, pxList ); /*lint !e9079 void * is used as this macro is used with timers and co-routines too. Alignment is known to be fine as the type of the pointer stored and retrieved is the same. */
\r
3849 vTaskGetInfo( ( TaskHandle_t ) pxNextTCB, &( pxTaskStatusArray[ uxTask ] ), pdTRUE, eState );
\r
3851 } while( pxNextTCB != pxFirstTCB );
\r
3855 mtCOVERAGE_TEST_MARKER();
\r
3861 #endif /* configUSE_TRACE_FACILITY */
\r
3862 /*-----------------------------------------------------------*/
\r
3864 #if ( ( configUSE_TRACE_FACILITY == 1 ) || ( INCLUDE_uxTaskGetStackHighWaterMark == 1 ) || ( INCLUDE_uxTaskGetStackHighWaterMark2 == 1 ) )
\r
3866 static configSTACK_DEPTH_TYPE prvTaskCheckFreeStackSpace( const uint8_t * pucStackByte )
\r
3868 uint32_t ulCount = 0U;
\r
3870 while( *pucStackByte == ( uint8_t ) tskSTACK_FILL_BYTE )
\r
3872 pucStackByte -= portSTACK_GROWTH;
\r
3876 ulCount /= ( uint32_t ) sizeof( StackType_t ); /*lint !e961 Casting is not redundant on smaller architectures. */
\r
3878 return ( configSTACK_DEPTH_TYPE ) ulCount;
\r
3881 #endif /* ( ( configUSE_TRACE_FACILITY == 1 ) || ( INCLUDE_uxTaskGetStackHighWaterMark == 1 ) || ( INCLUDE_uxTaskGetStackHighWaterMark2 == 1 ) ) */
\r
3882 /*-----------------------------------------------------------*/
\r
3884 #if ( INCLUDE_uxTaskGetStackHighWaterMark2 == 1 )
\r
3886 /* uxTaskGetStackHighWaterMark() and uxTaskGetStackHighWaterMark2() are the
\r
3887 * same except for their return type. Using configSTACK_DEPTH_TYPE allows the
\r
3888 * user to determine the return type. It gets around the problem of the value
\r
3889 * overflowing on 8-bit types without breaking backward compatibility for
\r
3890 * applications that expect an 8-bit return type. */
\r
3891 configSTACK_DEPTH_TYPE uxTaskGetStackHighWaterMark2( TaskHandle_t xTask )
\r
3894 uint8_t * pucEndOfStack;
\r
3895 configSTACK_DEPTH_TYPE uxReturn;
\r
3897 /* uxTaskGetStackHighWaterMark() and uxTaskGetStackHighWaterMark2() are
\r
3898 * the same except for their return type. Using configSTACK_DEPTH_TYPE
\r
3899 * allows the user to determine the return type. It gets around the
\r
3900 * problem of the value overflowing on 8-bit types without breaking
\r
3901 * backward compatibility for applications that expect an 8-bit return
\r
3904 pxTCB = prvGetTCBFromHandle( xTask );
\r
3906 #if portSTACK_GROWTH < 0
\r
3908 pucEndOfStack = ( uint8_t * ) pxTCB->pxStack;
\r
3912 pucEndOfStack = ( uint8_t * ) pxTCB->pxEndOfStack;
\r
3916 uxReturn = prvTaskCheckFreeStackSpace( pucEndOfStack );
\r
3921 #endif /* INCLUDE_uxTaskGetStackHighWaterMark2 */
\r
3922 /*-----------------------------------------------------------*/
\r
3924 #if ( INCLUDE_uxTaskGetStackHighWaterMark == 1 )
\r
3926 UBaseType_t uxTaskGetStackHighWaterMark( TaskHandle_t xTask )
\r
3929 uint8_t * pucEndOfStack;
\r
3930 UBaseType_t uxReturn;
\r
3932 pxTCB = prvGetTCBFromHandle( xTask );
\r
3934 #if portSTACK_GROWTH < 0
\r
3936 pucEndOfStack = ( uint8_t * ) pxTCB->pxStack;
\r
3940 pucEndOfStack = ( uint8_t * ) pxTCB->pxEndOfStack;
\r
3944 uxReturn = ( UBaseType_t ) prvTaskCheckFreeStackSpace( pucEndOfStack );
\r
3949 #endif /* INCLUDE_uxTaskGetStackHighWaterMark */
\r
3950 /*-----------------------------------------------------------*/
\r
3952 #if ( INCLUDE_vTaskDelete == 1 )
\r
3954 static void prvDeleteTCB( TCB_t * pxTCB )
\r
3956 /* This call is required specifically for the TriCore port. It must be
\r
3957 * above the vPortFree() calls. The call is also used by ports/demos that
\r
3958 * want to allocate and clean RAM statically. */
\r
3959 portCLEAN_UP_TCB( pxTCB );
\r
3961 /* Free up the memory allocated by the scheduler for the task. It is up
\r
3962 * to the task to free any memory allocated at the application level.
\r
3963 * See the third party link http://www.nadler.com/embedded/newlibAndFreeRTOS.html
\r
3964 * for additional information. */
\r
3965 #if ( configUSE_NEWLIB_REENTRANT == 1 )
\r
3967 _reclaim_reent( &( pxTCB->xNewLib_reent ) );
\r
3969 #endif /* configUSE_NEWLIB_REENTRANT */
\r
3971 #if ( ( configSUPPORT_DYNAMIC_ALLOCATION == 1 ) && ( configSUPPORT_STATIC_ALLOCATION == 0 ) && ( portUSING_MPU_WRAPPERS == 0 ) )
\r
3973 /* The task can only have been allocated dynamically - free both
\r
3974 * the stack and TCB. */
\r
3975 vPortFreeStack( pxTCB->pxStack );
\r
3976 vPortFree( pxTCB );
\r
3978 #elif ( tskSTATIC_AND_DYNAMIC_ALLOCATION_POSSIBLE != 0 ) /*lint !e731 !e9029 Macro has been consolidated for readability reasons. */
\r
3980 /* The task could have been allocated statically or dynamically, so
\r
3981 * check what was statically allocated before trying to free the
\r
3983 if( pxTCB->ucStaticallyAllocated == tskDYNAMICALLY_ALLOCATED_STACK_AND_TCB )
\r
3985 /* Both the stack and TCB were allocated dynamically, so both
\r
3986 * must be freed. */
\r
3987 vPortFreeStack( pxTCB->pxStack );
\r
3988 vPortFree( pxTCB );
\r
3990 else if( pxTCB->ucStaticallyAllocated == tskSTATICALLY_ALLOCATED_STACK_ONLY )
\r
3992 /* Only the stack was statically allocated, so the TCB is the
\r
3993 * only memory that must be freed. */
\r
3994 vPortFree( pxTCB );
\r
3998 /* Neither the stack nor the TCB were allocated dynamically, so
\r
3999 * nothing needs to be freed. */
\r
4000 configASSERT( pxTCB->ucStaticallyAllocated == tskSTATICALLY_ALLOCATED_STACK_AND_TCB );
\r
4001 mtCOVERAGE_TEST_MARKER();
\r
4004 #endif /* configSUPPORT_DYNAMIC_ALLOCATION */
\r
4007 #endif /* INCLUDE_vTaskDelete */
\r
4008 /*-----------------------------------------------------------*/
\r
4010 static void prvResetNextTaskUnblockTime( void )
\r
4012 if( listLIST_IS_EMPTY( pxDelayedTaskList ) != pdFALSE )
\r
4014 /* The new current delayed list is empty. Set xNextTaskUnblockTime to
\r
4015 * the maximum possible value so it is extremely unlikely that the
\r
4016 * if( xTickCount >= xNextTaskUnblockTime ) test will pass until
\r
4017 * there is an item in the delayed list. */
\r
4018 xNextTaskUnblockTime = portMAX_DELAY;
\r
4022 /* The new current delayed list is not empty, get the value of
\r
4023 * the item at the head of the delayed list. This is the time at
\r
4024 * which the task at the head of the delayed list should be removed
\r
4025 * from the Blocked state. */
\r
4026 xNextTaskUnblockTime = listGET_ITEM_VALUE_OF_HEAD_ENTRY( pxDelayedTaskList );
\r
4029 /*-----------------------------------------------------------*/
\r
4031 #if ( ( INCLUDE_xTaskGetCurrentTaskHandle == 1 ) || ( configUSE_MUTEXES == 1 ) )
\r
4033 TaskHandle_t xTaskGetCurrentTaskHandle( void )
\r
4035 TaskHandle_t xReturn;
\r
4037 /* A critical section is not required as this is not called from
\r
4038 * an interrupt and the current TCB will always be the same for any
\r
4039 * individual execution thread. */
\r
4040 xReturn = pxCurrentTCB;
\r
4045 #endif /* ( ( INCLUDE_xTaskGetCurrentTaskHandle == 1 ) || ( configUSE_MUTEXES == 1 ) ) */
\r
4046 /*-----------------------------------------------------------*/
\r
4048 #if ( ( INCLUDE_xTaskGetSchedulerState == 1 ) || ( configUSE_TIMERS == 1 ) )
\r
4050 BaseType_t xTaskGetSchedulerState( void )
\r
4052 BaseType_t xReturn;
\r
4054 if( xSchedulerRunning == pdFALSE )
\r
4056 xReturn = taskSCHEDULER_NOT_STARTED;
\r
4060 if( uxSchedulerSuspended == ( UBaseType_t ) pdFALSE )
\r
4062 xReturn = taskSCHEDULER_RUNNING;
\r
4066 xReturn = taskSCHEDULER_SUSPENDED;
\r
4073 #endif /* ( ( INCLUDE_xTaskGetSchedulerState == 1 ) || ( configUSE_TIMERS == 1 ) ) */
\r
4074 /*-----------------------------------------------------------*/
\r
4076 #if ( configUSE_MUTEXES == 1 )
\r
4078 BaseType_t xTaskPriorityInherit( TaskHandle_t const pxMutexHolder )
\r
4080 TCB_t * const pxMutexHolderTCB = pxMutexHolder;
\r
4081 BaseType_t xReturn = pdFALSE;
\r
4083 /* If the mutex was given back by an interrupt while the queue was
\r
4084 * locked then the mutex holder might now be NULL. _RB_ Is this still
\r
4085 * needed as interrupts can no longer use mutexes? */
\r
4086 if( pxMutexHolder != NULL )
\r
4088 /* If the holder of the mutex has a priority below the priority of
\r
4089 * the task attempting to obtain the mutex then it will temporarily
\r
4090 * inherit the priority of the task attempting to obtain the mutex. */
\r
4091 if( pxMutexHolderTCB->uxPriority < pxCurrentTCB->uxPriority )
\r
4093 /* Adjust the mutex holder state to account for its new
\r
4094 * priority. Only reset the event list item value if the value is
\r
4095 * not being used for anything else. */
\r
4096 if( ( listGET_LIST_ITEM_VALUE( &( pxMutexHolderTCB->xEventListItem ) ) & taskEVENT_LIST_ITEM_VALUE_IN_USE ) == 0UL )
\r
4098 listSET_LIST_ITEM_VALUE( &( pxMutexHolderTCB->xEventListItem ), ( TickType_t ) configMAX_PRIORITIES - ( TickType_t ) pxCurrentTCB->uxPriority ); /*lint !e961 MISRA exception as the casts are only redundant for some ports. */
\r
4102 mtCOVERAGE_TEST_MARKER();
\r
4105 /* If the task being modified is in the ready state it will need
\r
4106 * to be moved into a new list. */
\r
4107 if( listIS_CONTAINED_WITHIN( &( pxReadyTasksLists[ pxMutexHolderTCB->uxPriority ] ), &( pxMutexHolderTCB->xStateListItem ) ) != pdFALSE )
\r
4109 if( uxListRemove( &( pxMutexHolderTCB->xStateListItem ) ) == ( UBaseType_t ) 0 )
\r
4111 /* It is known that the task is in its ready list so
\r
4112 * there is no need to check again and the port level
\r
4113 * reset macro can be called directly. */
\r
4114 portRESET_READY_PRIORITY( pxMutexHolderTCB->uxPriority, uxTopReadyPriority );
\r
4118 mtCOVERAGE_TEST_MARKER();
\r
4121 /* Inherit the priority before being moved into the new list. */
\r
4122 pxMutexHolderTCB->uxPriority = pxCurrentTCB->uxPriority;
\r
4123 prvAddTaskToReadyList( pxMutexHolderTCB );
\r
4127 /* Just inherit the priority. */
\r
4128 pxMutexHolderTCB->uxPriority = pxCurrentTCB->uxPriority;
\r
4131 traceTASK_PRIORITY_INHERIT( pxMutexHolderTCB, pxCurrentTCB->uxPriority );
\r
4133 /* Inheritance occurred. */
\r
4138 if( pxMutexHolderTCB->uxBasePriority < pxCurrentTCB->uxPriority )
\r
4140 /* The base priority of the mutex holder is lower than the
\r
4141 * priority of the task attempting to take the mutex, but the
\r
4142 * current priority of the mutex holder is not lower than the
\r
4143 * priority of the task attempting to take the mutex.
\r
4144 * Therefore the mutex holder must have already inherited a
\r
4145 * priority, but inheritance would have occurred if that had
\r
4146 * not been the case. */
\r
4151 mtCOVERAGE_TEST_MARKER();
\r
4157 mtCOVERAGE_TEST_MARKER();
\r
4163 #endif /* configUSE_MUTEXES */
\r
4164 /*-----------------------------------------------------------*/
\r
4166 #if ( configUSE_MUTEXES == 1 )
\r
4168 BaseType_t xTaskPriorityDisinherit( TaskHandle_t const pxMutexHolder )
\r
4170 TCB_t * const pxTCB = pxMutexHolder;
\r
4171 BaseType_t xReturn = pdFALSE;
\r
4173 if( pxMutexHolder != NULL )
\r
4175 /* A task can only have an inherited priority if it holds the mutex.
\r
4176 * If the mutex is held by a task then it cannot be given from an
\r
4177 * interrupt, and if a mutex is given by the holding task then it must
\r
4178 * be the running state task. */
\r
4179 configASSERT( pxTCB == pxCurrentTCB );
\r
4180 configASSERT( pxTCB->uxMutexesHeld );
\r
4181 ( pxTCB->uxMutexesHeld )--;
\r
4183 /* Has the holder of the mutex inherited the priority of another
\r
4185 if( pxTCB->uxPriority != pxTCB->uxBasePriority )
\r
4187 /* Only disinherit if no other mutexes are held. */
\r
4188 if( pxTCB->uxMutexesHeld == ( UBaseType_t ) 0 )
\r
4190 /* A task can only have an inherited priority if it holds
\r
4191 * the mutex. If the mutex is held by a task then it cannot be
\r
4192 * given from an interrupt, and if a mutex is given by the
\r
4193 * holding task then it must be the running state task. Remove
\r
4194 * the holding task from the ready list. */
\r
4195 if( uxListRemove( &( pxTCB->xStateListItem ) ) == ( UBaseType_t ) 0 )
\r
4197 portRESET_READY_PRIORITY( pxTCB->uxPriority, uxTopReadyPriority );
\r
4201 mtCOVERAGE_TEST_MARKER();
\r
4204 /* Disinherit the priority before adding the task into the
\r
4205 * new ready list. */
\r
4206 traceTASK_PRIORITY_DISINHERIT( pxTCB, pxTCB->uxBasePriority );
\r
4207 pxTCB->uxPriority = pxTCB->uxBasePriority;
\r
4209 /* Reset the event list item value. It cannot be in use for
\r
4210 * any other purpose if this task is running, and it must be
\r
4211 * running to give back the mutex. */
\r
4212 listSET_LIST_ITEM_VALUE( &( pxTCB->xEventListItem ), ( TickType_t ) configMAX_PRIORITIES - ( TickType_t ) pxTCB->uxPriority ); /*lint !e961 MISRA exception as the casts are only redundant for some ports. */
\r
4213 prvAddTaskToReadyList( pxTCB );
\r
4215 /* Return true to indicate that a context switch is required.
\r
4216 * This is only actually required in the corner case whereby
\r
4217 * multiple mutexes were held and the mutexes were given back
\r
4218 * in an order different to that in which they were taken.
\r
4219 * If a context switch did not occur when the first mutex was
\r
4220 * returned, even if a task was waiting on it, then a context
\r
4221 * switch should occur when the last mutex is returned whether
\r
4222 * a task is waiting on it or not. */
\r
4227 mtCOVERAGE_TEST_MARKER();
\r
4232 mtCOVERAGE_TEST_MARKER();
\r
4237 mtCOVERAGE_TEST_MARKER();
\r
4243 #endif /* configUSE_MUTEXES */
\r
4244 /*-----------------------------------------------------------*/
\r
4246 #if ( configUSE_MUTEXES == 1 )
\r
4248 void vTaskPriorityDisinheritAfterTimeout( TaskHandle_t const pxMutexHolder,
\r
4249 UBaseType_t uxHighestPriorityWaitingTask )
\r
4251 TCB_t * const pxTCB = pxMutexHolder;
\r
4252 UBaseType_t uxPriorityUsedOnEntry, uxPriorityToUse;
\r
4253 const UBaseType_t uxOnlyOneMutexHeld = ( UBaseType_t ) 1;
\r
4255 if( pxMutexHolder != NULL )
\r
4257 /* If pxMutexHolder is not NULL then the holder must hold at least
\r
4259 configASSERT( pxTCB->uxMutexesHeld );
\r
4261 /* Determine the priority to which the priority of the task that
\r
4262 * holds the mutex should be set. This will be the greater of the
\r
4263 * holding task's base priority and the priority of the highest
\r
4264 * priority task that is waiting to obtain the mutex. */
\r
4265 if( pxTCB->uxBasePriority < uxHighestPriorityWaitingTask )
\r
4267 uxPriorityToUse = uxHighestPriorityWaitingTask;
\r
4271 uxPriorityToUse = pxTCB->uxBasePriority;
\r
4274 /* Does the priority need to change? */
\r
4275 if( pxTCB->uxPriority != uxPriorityToUse )
\r
4277 /* Only disinherit if no other mutexes are held. This is a
\r
4278 * simplification in the priority inheritance implementation. If
\r
4279 * the task that holds the mutex is also holding other mutexes then
\r
4280 * the other mutexes may have caused the priority inheritance. */
\r
4281 if( pxTCB->uxMutexesHeld == uxOnlyOneMutexHeld )
\r
4283 /* If a task has timed out because it already holds the
\r
4284 * mutex it was trying to obtain then it cannot of inherited
\r
4285 * its own priority. */
\r
4286 configASSERT( pxTCB != pxCurrentTCB );
\r
4288 /* Disinherit the priority, remembering the previous
\r
4289 * priority to facilitate determining the subject task's
\r
4291 traceTASK_PRIORITY_DISINHERIT( pxTCB, uxPriorityToUse );
\r
4292 uxPriorityUsedOnEntry = pxTCB->uxPriority;
\r
4293 pxTCB->uxPriority = uxPriorityToUse;
\r
4295 /* Only reset the event list item value if the value is not
\r
4296 * being used for anything else. */
\r
4297 if( ( listGET_LIST_ITEM_VALUE( &( pxTCB->xEventListItem ) ) & taskEVENT_LIST_ITEM_VALUE_IN_USE ) == 0UL )
\r
4299 listSET_LIST_ITEM_VALUE( &( pxTCB->xEventListItem ), ( TickType_t ) configMAX_PRIORITIES - ( TickType_t ) uxPriorityToUse ); /*lint !e961 MISRA exception as the casts are only redundant for some ports. */
\r
4303 mtCOVERAGE_TEST_MARKER();
\r
4306 /* If the running task is not the task that holds the mutex
\r
4307 * then the task that holds the mutex could be in either the
\r
4308 * Ready, Blocked or Suspended states. Only remove the task
\r
4309 * from its current state list if it is in the Ready state as
\r
4310 * the task's priority is going to change and there is one
\r
4311 * Ready list per priority. */
\r
4312 if( listIS_CONTAINED_WITHIN( &( pxReadyTasksLists[ uxPriorityUsedOnEntry ] ), &( pxTCB->xStateListItem ) ) != pdFALSE )
\r
4314 if( uxListRemove( &( pxTCB->xStateListItem ) ) == ( UBaseType_t ) 0 )
\r
4316 /* It is known that the task is in its ready list so
\r
4317 * there is no need to check again and the port level
\r
4318 * reset macro can be called directly. */
\r
4319 portRESET_READY_PRIORITY( pxTCB->uxPriority, uxTopReadyPriority );
\r
4323 mtCOVERAGE_TEST_MARKER();
\r
4326 prvAddTaskToReadyList( pxTCB );
\r
4330 mtCOVERAGE_TEST_MARKER();
\r
4335 mtCOVERAGE_TEST_MARKER();
\r
4340 mtCOVERAGE_TEST_MARKER();
\r
4345 mtCOVERAGE_TEST_MARKER();
\r
4349 #endif /* configUSE_MUTEXES */
\r
4350 /*-----------------------------------------------------------*/
\r
4352 #if ( portCRITICAL_NESTING_IN_TCB == 1 )
\r
4354 void vTaskEnterCritical( void )
\r
4356 portDISABLE_INTERRUPTS();
\r
4358 if( xSchedulerRunning != pdFALSE )
\r
4360 ( pxCurrentTCB->uxCriticalNesting )++;
\r
4362 /* This is not the interrupt safe version of the enter critical
\r
4363 * function so assert() if it is being called from an interrupt
\r
4364 * context. Only API functions that end in "FromISR" can be used in an
\r
4365 * interrupt. Only assert if the critical nesting count is 1 to
\r
4366 * protect against recursive calls if the assert function also uses a
\r
4367 * critical section. */
\r
4368 if( pxCurrentTCB->uxCriticalNesting == 1 )
\r
4370 portASSERT_IF_IN_ISR();
\r
4375 mtCOVERAGE_TEST_MARKER();
\r
4379 #endif /* portCRITICAL_NESTING_IN_TCB */
\r
4380 /*-----------------------------------------------------------*/
\r
4382 #if ( portCRITICAL_NESTING_IN_TCB == 1 )
\r
4384 void vTaskExitCritical( void )
\r
4386 if( xSchedulerRunning != pdFALSE )
\r
4388 if( pxCurrentTCB->uxCriticalNesting > 0U )
\r
4390 ( pxCurrentTCB->uxCriticalNesting )--;
\r
4392 if( pxCurrentTCB->uxCriticalNesting == 0U )
\r
4394 portENABLE_INTERRUPTS();
\r
4398 mtCOVERAGE_TEST_MARKER();
\r
4403 mtCOVERAGE_TEST_MARKER();
\r
4408 mtCOVERAGE_TEST_MARKER();
\r
4412 #endif /* portCRITICAL_NESTING_IN_TCB */
\r
4413 /*-----------------------------------------------------------*/
\r
4415 #if ( ( ( configUSE_TRACE_FACILITY == 1 ) || ( configGENERATE_RUN_TIME_STATS == 1 ) ) && \
\r
4416 ( configUSE_STATS_FORMATTING_FUNCTIONS > 0 ) && \
\r
4417 ( configSUPPORT_DYNAMIC_ALLOCATION == 1 ) )
\r
4419 static char * prvWriteNameToBuffer( char * pcBuffer,
\r
4420 const char * pcTaskName )
\r
4424 /* Start by copying the entire string. */
\r
4425 strcpy( pcBuffer, pcTaskName );
\r
4427 /* Pad the end of the string with spaces to ensure columns line up when
\r
4429 for( x = strlen( pcBuffer ); x < ( size_t ) ( configMAX_TASK_NAME_LEN - 1 ); x++ )
\r
4431 pcBuffer[ x ] = ' ';
\r
4435 pcBuffer[ x ] = ( char ) 0x00;
\r
4437 /* Return the new end of string. */
\r
4438 return &( pcBuffer[ x ] );
\r
4441 #endif /* ( configUSE_TRACE_FACILITY == 1 ) && ( configUSE_STATS_FORMATTING_FUNCTIONS > 0 ) */
\r
4442 /*-----------------------------------------------------------*/
\r
4444 #if ( ( configUSE_TRACE_FACILITY == 1 ) && ( configUSE_STATS_FORMATTING_FUNCTIONS > 0 ) && ( configSUPPORT_DYNAMIC_ALLOCATION == 1 ) )
\r
4446 void vTaskList( char * pcWriteBuffer )
\r
4448 TaskStatus_t * pxTaskStatusArray;
\r
4449 UBaseType_t uxArraySize, x;
\r
4455 * This function is provided for convenience only, and is used by many
\r
4456 * of the demo applications. Do not consider it to be part of the
\r
4459 * vTaskList() calls uxTaskGetSystemState(), then formats part of the
\r
4460 * uxTaskGetSystemState() output into a human readable table that
\r
4461 * displays task: names, states, priority, stack usage and task number.
\r
4462 * Stack usage specified as the number of unused StackType_t words stack can hold
\r
4463 * on top of stack - not the number of bytes.
\r
4465 * vTaskList() has a dependency on the sprintf() C library function that
\r
4466 * might bloat the code size, use a lot of stack, and provide different
\r
4467 * results on different platforms. An alternative, tiny, third party,
\r
4468 * and limited functionality implementation of sprintf() is provided in
\r
4469 * many of the FreeRTOS/Demo sub-directories in a file called
\r
4470 * printf-stdarg.c (note printf-stdarg.c does not provide a full
\r
4471 * snprintf() implementation!).
\r
4473 * It is recommended that production systems call uxTaskGetSystemState()
\r
4474 * directly to get access to raw stats data, rather than indirectly
\r
4475 * through a call to vTaskList().
\r
4479 /* Make sure the write buffer does not contain a string. */
\r
4480 *pcWriteBuffer = ( char ) 0x00;
\r
4482 /* Take a snapshot of the number of tasks in case it changes while this
\r
4483 * function is executing. */
\r
4484 uxArraySize = uxCurrentNumberOfTasks;
\r
4486 /* Allocate an array index for each task. NOTE! if
\r
4487 * configSUPPORT_DYNAMIC_ALLOCATION is set to 0 then pvPortMalloc() will
\r
4488 * equate to NULL. */
\r
4489 pxTaskStatusArray = pvPortMalloc( uxCurrentNumberOfTasks * sizeof( TaskStatus_t ) ); /*lint !e9079 All values returned by pvPortMalloc() have at least the alignment required by the MCU's stack and this allocation allocates a struct that has the alignment requirements of a pointer. */
\r
4491 if( pxTaskStatusArray != NULL )
\r
4493 /* Generate the (binary) data. */
\r
4494 uxArraySize = uxTaskGetSystemState( pxTaskStatusArray, uxArraySize, NULL );
\r
4496 /* Create a human readable table from the binary data. */
\r
4497 for( x = 0; x < uxArraySize; x++ )
\r
4499 switch( pxTaskStatusArray[ x ].eCurrentState )
\r
4502 cStatus = tskRUNNING_CHAR;
\r
4506 cStatus = tskREADY_CHAR;
\r
4510 cStatus = tskBLOCKED_CHAR;
\r
4514 cStatus = tskSUSPENDED_CHAR;
\r
4518 cStatus = tskDELETED_CHAR;
\r
4521 case eInvalid: /* Fall through. */
\r
4522 default: /* Should not get here, but it is included
\r
4523 * to prevent static checking errors. */
\r
4524 cStatus = ( char ) 0x00;
\r
4528 /* Write the task name to the string, padding with spaces so it
\r
4529 * can be printed in tabular form more easily. */
\r
4530 pcWriteBuffer = prvWriteNameToBuffer( pcWriteBuffer, pxTaskStatusArray[ x ].pcTaskName );
\r
4532 /* Write the rest of the string. */
\r
4533 sprintf( pcWriteBuffer, "\t%c\t%u\t%u\t%u\r\n", cStatus, ( unsigned int ) pxTaskStatusArray[ x ].uxCurrentPriority, ( unsigned int ) pxTaskStatusArray[ x ].usStackHighWaterMark, ( unsigned int ) pxTaskStatusArray[ x ].xTaskNumber ); /*lint !e586 sprintf() allowed as this is compiled with many compilers and this is a utility function only - not part of the core kernel implementation. */
\r
4534 pcWriteBuffer += strlen( pcWriteBuffer ); /*lint !e9016 Pointer arithmetic ok on char pointers especially as in this case where it best denotes the intent of the code. */
\r
4537 /* Free the array again. NOTE! If configSUPPORT_DYNAMIC_ALLOCATION
\r
4538 * is 0 then vPortFree() will be #defined to nothing. */
\r
4539 vPortFree( pxTaskStatusArray );
\r
4543 mtCOVERAGE_TEST_MARKER();
\r
4547 #endif /* ( ( configUSE_TRACE_FACILITY == 1 ) && ( configUSE_STATS_FORMATTING_FUNCTIONS > 0 ) && ( configSUPPORT_DYNAMIC_ALLOCATION == 1 ) ) */
\r
4548 /*----------------------------------------------------------*/
\r
4550 #if ( ( configGENERATE_RUN_TIME_STATS == 1 ) && ( configUSE_STATS_FORMATTING_FUNCTIONS > 0 ) && ( configSUPPORT_DYNAMIC_ALLOCATION == 1 ) )
\r
4552 void vTaskGetRunTimeStats( char * pcWriteBuffer )
\r
4554 TaskStatus_t * pxTaskStatusArray;
\r
4555 UBaseType_t uxArraySize, x;
\r
4556 configRUN_TIME_COUNTER_TYPE ulTotalTime, ulStatsAsPercentage;
\r
4558 #if ( configUSE_TRACE_FACILITY != 1 )
\r
4560 #error configUSE_TRACE_FACILITY must also be set to 1 in FreeRTOSConfig.h to use vTaskGetRunTimeStats().
\r
4567 * This function is provided for convenience only, and is used by many
\r
4568 * of the demo applications. Do not consider it to be part of the
\r
4571 * vTaskGetRunTimeStats() calls uxTaskGetSystemState(), then formats part
\r
4572 * of the uxTaskGetSystemState() output into a human readable table that
\r
4573 * displays the amount of time each task has spent in the Running state
\r
4574 * in both absolute and percentage terms.
\r
4576 * vTaskGetRunTimeStats() has a dependency on the sprintf() C library
\r
4577 * function that might bloat the code size, use a lot of stack, and
\r
4578 * provide different results on different platforms. An alternative,
\r
4579 * tiny, third party, and limited functionality implementation of
\r
4580 * sprintf() is provided in many of the FreeRTOS/Demo sub-directories in
\r
4581 * a file called printf-stdarg.c (note printf-stdarg.c does not provide
\r
4582 * a full snprintf() implementation!).
\r
4584 * It is recommended that production systems call uxTaskGetSystemState()
\r
4585 * directly to get access to raw stats data, rather than indirectly
\r
4586 * through a call to vTaskGetRunTimeStats().
\r
4589 /* Make sure the write buffer does not contain a string. */
\r
4590 *pcWriteBuffer = ( char ) 0x00;
\r
4592 /* Take a snapshot of the number of tasks in case it changes while this
\r
4593 * function is executing. */
\r
4594 uxArraySize = uxCurrentNumberOfTasks;
\r
4596 /* Allocate an array index for each task. NOTE! If
\r
4597 * configSUPPORT_DYNAMIC_ALLOCATION is set to 0 then pvPortMalloc() will
\r
4598 * equate to NULL. */
\r
4599 pxTaskStatusArray = pvPortMalloc( uxCurrentNumberOfTasks * sizeof( TaskStatus_t ) ); /*lint !e9079 All values returned by pvPortMalloc() have at least the alignment required by the MCU's stack and this allocation allocates a struct that has the alignment requirements of a pointer. */
\r
4601 if( pxTaskStatusArray != NULL )
\r
4603 /* Generate the (binary) data. */
\r
4604 uxArraySize = uxTaskGetSystemState( pxTaskStatusArray, uxArraySize, &ulTotalTime );
\r
4606 /* For percentage calculations. */
\r
4607 ulTotalTime /= 100UL;
\r
4609 /* Avoid divide by zero errors. */
\r
4610 if( ulTotalTime > 0UL )
\r
4612 /* Create a human readable table from the binary data. */
\r
4613 for( x = 0; x < uxArraySize; x++ )
\r
4615 /* What percentage of the total run time has the task used?
\r
4616 * This will always be rounded down to the nearest integer.
\r
4617 * ulTotalRunTime has already been divided by 100. */
\r
4618 ulStatsAsPercentage = pxTaskStatusArray[ x ].ulRunTimeCounter / ulTotalTime;
\r
4620 /* Write the task name to the string, padding with
\r
4621 * spaces so it can be printed in tabular form more
\r
4623 pcWriteBuffer = prvWriteNameToBuffer( pcWriteBuffer, pxTaskStatusArray[ x ].pcTaskName );
\r
4625 if( ulStatsAsPercentage > 0UL )
\r
4627 #ifdef portLU_PRINTF_SPECIFIER_REQUIRED
\r
4629 sprintf( pcWriteBuffer, "\t%lu\t\t%lu%%\r\n", pxTaskStatusArray[ x ].ulRunTimeCounter, ulStatsAsPercentage );
\r
4633 /* sizeof( int ) == sizeof( long ) so a smaller
\r
4634 * printf() library can be used. */
\r
4635 sprintf( pcWriteBuffer, "\t%u\t\t%u%%\r\n", ( unsigned int ) pxTaskStatusArray[ x ].ulRunTimeCounter, ( unsigned int ) ulStatsAsPercentage ); /*lint !e586 sprintf() allowed as this is compiled with many compilers and this is a utility function only - not part of the core kernel implementation. */
\r
4641 /* If the percentage is zero here then the task has
\r
4642 * consumed less than 1% of the total run time. */
\r
4643 #ifdef portLU_PRINTF_SPECIFIER_REQUIRED
\r
4645 sprintf( pcWriteBuffer, "\t%lu\t\t<1%%\r\n", pxTaskStatusArray[ x ].ulRunTimeCounter );
\r
4649 /* sizeof( int ) == sizeof( long ) so a smaller
\r
4650 * printf() library can be used. */
\r
4651 sprintf( pcWriteBuffer, "\t%u\t\t<1%%\r\n", ( unsigned int ) pxTaskStatusArray[ x ].ulRunTimeCounter ); /*lint !e586 sprintf() allowed as this is compiled with many compilers and this is a utility function only - not part of the core kernel implementation. */
\r
4656 pcWriteBuffer += strlen( pcWriteBuffer ); /*lint !e9016 Pointer arithmetic ok on char pointers especially as in this case where it best denotes the intent of the code. */
\r
4661 mtCOVERAGE_TEST_MARKER();
\r
4664 /* Free the array again. NOTE! If configSUPPORT_DYNAMIC_ALLOCATION
\r
4665 * is 0 then vPortFree() will be #defined to nothing. */
\r
4666 vPortFree( pxTaskStatusArray );
\r
4670 mtCOVERAGE_TEST_MARKER();
\r
4674 #endif /* ( ( configGENERATE_RUN_TIME_STATS == 1 ) && ( configUSE_STATS_FORMATTING_FUNCTIONS > 0 ) && ( configSUPPORT_STATIC_ALLOCATION == 1 ) ) */
\r
4675 /*-----------------------------------------------------------*/
\r
4677 TickType_t uxTaskResetEventItemValue( void )
\r
4679 TickType_t uxReturn;
\r
4681 uxReturn = listGET_LIST_ITEM_VALUE( &( pxCurrentTCB->xEventListItem ) );
\r
4683 /* Reset the event list item to its normal value - so it can be used with
\r
4684 * queues and semaphores. */
\r
4685 listSET_LIST_ITEM_VALUE( &( pxCurrentTCB->xEventListItem ), ( ( TickType_t ) configMAX_PRIORITIES - ( TickType_t ) pxCurrentTCB->uxPriority ) ); /*lint !e961 MISRA exception as the casts are only redundant for some ports. */
\r
4689 /*-----------------------------------------------------------*/
\r
4691 #if ( configUSE_MUTEXES == 1 )
\r
4693 TaskHandle_t pvTaskIncrementMutexHeldCount( void )
\r
4695 /* If xSemaphoreCreateMutex() is called before any tasks have been created
\r
4696 * then pxCurrentTCB will be NULL. */
\r
4697 if( pxCurrentTCB != NULL )
\r
4699 ( pxCurrentTCB->uxMutexesHeld )++;
\r
4702 return pxCurrentTCB;
\r
4705 #endif /* configUSE_MUTEXES */
\r
4706 /*-----------------------------------------------------------*/
\r
4708 #if ( configUSE_TASK_NOTIFICATIONS == 1 )
\r
4710 uint32_t ulTaskGenericNotifyTake( UBaseType_t uxIndexToWait,
\r
4711 BaseType_t xClearCountOnExit,
\r
4712 TickType_t xTicksToWait )
\r
4714 uint32_t ulReturn;
\r
4716 configASSERT( uxIndexToWait < configTASK_NOTIFICATION_ARRAY_ENTRIES );
\r
4718 taskENTER_CRITICAL();
\r
4720 /* Only block if the notification count is not already non-zero. */
\r
4721 if( pxCurrentTCB->ulNotifiedValue[ uxIndexToWait ] == 0UL )
\r
4723 /* Mark this task as waiting for a notification. */
\r
4724 pxCurrentTCB->ucNotifyState[ uxIndexToWait ] = taskWAITING_NOTIFICATION;
\r
4726 if( xTicksToWait > ( TickType_t ) 0 )
\r
4728 prvAddCurrentTaskToDelayedList( xTicksToWait, pdTRUE );
\r
4729 traceTASK_NOTIFY_TAKE_BLOCK( uxIndexToWait );
\r
4731 /* All ports are written to allow a yield in a critical
\r
4732 * section (some will yield immediately, others wait until the
\r
4733 * critical section exits) - but it is not something that
\r
4734 * application code should ever do. */
\r
4735 portYIELD_WITHIN_API();
\r
4739 mtCOVERAGE_TEST_MARKER();
\r
4744 mtCOVERAGE_TEST_MARKER();
\r
4747 taskEXIT_CRITICAL();
\r
4749 taskENTER_CRITICAL();
\r
4751 traceTASK_NOTIFY_TAKE( uxIndexToWait );
\r
4752 ulReturn = pxCurrentTCB->ulNotifiedValue[ uxIndexToWait ];
\r
4754 if( ulReturn != 0UL )
\r
4756 if( xClearCountOnExit != pdFALSE )
\r
4758 pxCurrentTCB->ulNotifiedValue[ uxIndexToWait ] = 0UL;
\r
4762 pxCurrentTCB->ulNotifiedValue[ uxIndexToWait ] = ulReturn - ( uint32_t ) 1;
\r
4767 mtCOVERAGE_TEST_MARKER();
\r
4770 pxCurrentTCB->ucNotifyState[ uxIndexToWait ] = taskNOT_WAITING_NOTIFICATION;
\r
4772 taskEXIT_CRITICAL();
\r
4777 #endif /* configUSE_TASK_NOTIFICATIONS */
\r
4778 /*-----------------------------------------------------------*/
\r
4780 #if ( configUSE_TASK_NOTIFICATIONS == 1 )
\r
4782 BaseType_t xTaskGenericNotifyWait( UBaseType_t uxIndexToWait,
\r
4783 uint32_t ulBitsToClearOnEntry,
\r
4784 uint32_t ulBitsToClearOnExit,
\r
4785 uint32_t * pulNotificationValue,
\r
4786 TickType_t xTicksToWait )
\r
4788 BaseType_t xReturn;
\r
4790 configASSERT( uxIndexToWait < configTASK_NOTIFICATION_ARRAY_ENTRIES );
\r
4792 taskENTER_CRITICAL();
\r
4794 /* Only block if a notification is not already pending. */
\r
4795 if( pxCurrentTCB->ucNotifyState[ uxIndexToWait ] != taskNOTIFICATION_RECEIVED )
\r
4797 /* Clear bits in the task's notification value as bits may get
\r
4798 * set by the notifying task or interrupt. This can be used to
\r
4799 * clear the value to zero. */
\r
4800 pxCurrentTCB->ulNotifiedValue[ uxIndexToWait ] &= ~ulBitsToClearOnEntry;
\r
4802 /* Mark this task as waiting for a notification. */
\r
4803 pxCurrentTCB->ucNotifyState[ uxIndexToWait ] = taskWAITING_NOTIFICATION;
\r
4805 if( xTicksToWait > ( TickType_t ) 0 )
\r
4807 prvAddCurrentTaskToDelayedList( xTicksToWait, pdTRUE );
\r
4808 traceTASK_NOTIFY_WAIT_BLOCK( uxIndexToWait );
\r
4810 /* All ports are written to allow a yield in a critical
\r
4811 * section (some will yield immediately, others wait until the
\r
4812 * critical section exits) - but it is not something that
\r
4813 * application code should ever do. */
\r
4814 portYIELD_WITHIN_API();
\r
4818 mtCOVERAGE_TEST_MARKER();
\r
4823 mtCOVERAGE_TEST_MARKER();
\r
4826 taskEXIT_CRITICAL();
\r
4828 taskENTER_CRITICAL();
\r
4830 traceTASK_NOTIFY_WAIT( uxIndexToWait );
\r
4832 if( pulNotificationValue != NULL )
\r
4834 /* Output the current notification value, which may or may not
\r
4835 * have changed. */
\r
4836 *pulNotificationValue = pxCurrentTCB->ulNotifiedValue[ uxIndexToWait ];
\r
4839 /* If ucNotifyValue is set then either the task never entered the
\r
4840 * blocked state (because a notification was already pending) or the
\r
4841 * task unblocked because of a notification. Otherwise the task
\r
4842 * unblocked because of a timeout. */
\r
4843 if( pxCurrentTCB->ucNotifyState[ uxIndexToWait ] != taskNOTIFICATION_RECEIVED )
\r
4845 /* A notification was not received. */
\r
4846 xReturn = pdFALSE;
\r
4850 /* A notification was already pending or a notification was
\r
4851 * received while the task was waiting. */
\r
4852 pxCurrentTCB->ulNotifiedValue[ uxIndexToWait ] &= ~ulBitsToClearOnExit;
\r
4856 pxCurrentTCB->ucNotifyState[ uxIndexToWait ] = taskNOT_WAITING_NOTIFICATION;
\r
4858 taskEXIT_CRITICAL();
\r
4863 #endif /* configUSE_TASK_NOTIFICATIONS */
\r
4864 /*-----------------------------------------------------------*/
\r
4866 #if ( configUSE_TASK_NOTIFICATIONS == 1 )
\r
4868 BaseType_t xTaskGenericNotify( TaskHandle_t xTaskToNotify,
\r
4869 UBaseType_t uxIndexToNotify,
\r
4871 eNotifyAction eAction,
\r
4872 uint32_t * pulPreviousNotificationValue )
\r
4875 BaseType_t xReturn = pdPASS;
\r
4876 uint8_t ucOriginalNotifyState;
\r
4878 configASSERT( uxIndexToNotify < configTASK_NOTIFICATION_ARRAY_ENTRIES );
\r
4879 configASSERT( xTaskToNotify );
\r
4880 pxTCB = xTaskToNotify;
\r
4882 taskENTER_CRITICAL();
\r
4884 if( pulPreviousNotificationValue != NULL )
\r
4886 *pulPreviousNotificationValue = pxTCB->ulNotifiedValue[ uxIndexToNotify ];
\r
4889 ucOriginalNotifyState = pxTCB->ucNotifyState[ uxIndexToNotify ];
\r
4891 pxTCB->ucNotifyState[ uxIndexToNotify ] = taskNOTIFICATION_RECEIVED;
\r
4896 pxTCB->ulNotifiedValue[ uxIndexToNotify ] |= ulValue;
\r
4900 ( pxTCB->ulNotifiedValue[ uxIndexToNotify ] )++;
\r
4903 case eSetValueWithOverwrite:
\r
4904 pxTCB->ulNotifiedValue[ uxIndexToNotify ] = ulValue;
\r
4907 case eSetValueWithoutOverwrite:
\r
4909 if( ucOriginalNotifyState != taskNOTIFICATION_RECEIVED )
\r
4911 pxTCB->ulNotifiedValue[ uxIndexToNotify ] = ulValue;
\r
4915 /* The value could not be written to the task. */
\r
4923 /* The task is being notified without its notify value being
\r
4929 /* Should not get here if all enums are handled.
\r
4930 * Artificially force an assert by testing a value the
\r
4931 * compiler can't assume is const. */
\r
4932 configASSERT( xTickCount == ( TickType_t ) 0 );
\r
4937 traceTASK_NOTIFY( uxIndexToNotify );
\r
4939 /* If the task is in the blocked state specifically to wait for a
\r
4940 * notification then unblock it now. */
\r
4941 if( ucOriginalNotifyState == taskWAITING_NOTIFICATION )
\r
4943 listREMOVE_ITEM( &( pxTCB->xStateListItem ) );
\r
4944 prvAddTaskToReadyList( pxTCB );
\r
4946 /* The task should not have been on an event list. */
\r
4947 configASSERT( listLIST_ITEM_CONTAINER( &( pxTCB->xEventListItem ) ) == NULL );
\r
4949 #if ( configUSE_TICKLESS_IDLE != 0 )
\r
4951 /* If a task is blocked waiting for a notification then
\r
4952 * xNextTaskUnblockTime might be set to the blocked task's time
\r
4953 * out time. If the task is unblocked for a reason other than
\r
4954 * a timeout xNextTaskUnblockTime is normally left unchanged,
\r
4955 * because it will automatically get reset to a new value when
\r
4956 * the tick count equals xNextTaskUnblockTime. However if
\r
4957 * tickless idling is used it might be more important to enter
\r
4958 * sleep mode at the earliest possible time - so reset
\r
4959 * xNextTaskUnblockTime here to ensure it is updated at the
\r
4960 * earliest possible time. */
\r
4961 prvResetNextTaskUnblockTime();
\r
4965 if( pxTCB->uxPriority > pxCurrentTCB->uxPriority )
\r
4967 /* The notified task has a priority above the currently
\r
4968 * executing task so a yield is required. */
\r
4969 taskYIELD_IF_USING_PREEMPTION();
\r
4973 mtCOVERAGE_TEST_MARKER();
\r
4978 mtCOVERAGE_TEST_MARKER();
\r
4981 taskEXIT_CRITICAL();
\r
4986 #endif /* configUSE_TASK_NOTIFICATIONS */
\r
4987 /*-----------------------------------------------------------*/
\r
4989 #if ( configUSE_TASK_NOTIFICATIONS == 1 )
\r
4991 BaseType_t xTaskGenericNotifyFromISR( TaskHandle_t xTaskToNotify,
\r
4992 UBaseType_t uxIndexToNotify,
\r
4994 eNotifyAction eAction,
\r
4995 uint32_t * pulPreviousNotificationValue,
\r
4996 BaseType_t * pxHigherPriorityTaskWoken )
\r
4999 uint8_t ucOriginalNotifyState;
\r
5000 BaseType_t xReturn = pdPASS;
\r
5001 UBaseType_t uxSavedInterruptStatus;
\r
5003 configASSERT( xTaskToNotify );
\r
5004 configASSERT( uxIndexToNotify < configTASK_NOTIFICATION_ARRAY_ENTRIES );
\r
5006 /* RTOS ports that support interrupt nesting have the concept of a
\r
5007 * maximum system call (or maximum API call) interrupt priority.
\r
5008 * Interrupts that are above the maximum system call priority are keep
\r
5009 * permanently enabled, even when the RTOS kernel is in a critical section,
\r
5010 * but cannot make any calls to FreeRTOS API functions. If configASSERT()
\r
5011 * is defined in FreeRTOSConfig.h then
\r
5012 * portASSERT_IF_INTERRUPT_PRIORITY_INVALID() will result in an assertion
\r
5013 * failure if a FreeRTOS API function is called from an interrupt that has
\r
5014 * been assigned a priority above the configured maximum system call
\r
5015 * priority. Only FreeRTOS functions that end in FromISR can be called
\r
5016 * from interrupts that have been assigned a priority at or (logically)
\r
5017 * below the maximum system call interrupt priority. FreeRTOS maintains a
\r
5018 * separate interrupt safe API to ensure interrupt entry is as fast and as
\r
5019 * simple as possible. More information (albeit Cortex-M specific) is
\r
5020 * provided on the following link:
\r
5021 * https://www.FreeRTOS.org/RTOS-Cortex-M3-M4.html */
\r
5022 portASSERT_IF_INTERRUPT_PRIORITY_INVALID();
\r
5024 pxTCB = xTaskToNotify;
\r
5026 uxSavedInterruptStatus = portSET_INTERRUPT_MASK_FROM_ISR();
\r
5028 if( pulPreviousNotificationValue != NULL )
\r
5030 *pulPreviousNotificationValue = pxTCB->ulNotifiedValue[ uxIndexToNotify ];
\r
5033 ucOriginalNotifyState = pxTCB->ucNotifyState[ uxIndexToNotify ];
\r
5034 pxTCB->ucNotifyState[ uxIndexToNotify ] = taskNOTIFICATION_RECEIVED;
\r
5039 pxTCB->ulNotifiedValue[ uxIndexToNotify ] |= ulValue;
\r
5043 ( pxTCB->ulNotifiedValue[ uxIndexToNotify ] )++;
\r
5046 case eSetValueWithOverwrite:
\r
5047 pxTCB->ulNotifiedValue[ uxIndexToNotify ] = ulValue;
\r
5050 case eSetValueWithoutOverwrite:
\r
5052 if( ucOriginalNotifyState != taskNOTIFICATION_RECEIVED )
\r
5054 pxTCB->ulNotifiedValue[ uxIndexToNotify ] = ulValue;
\r
5058 /* The value could not be written to the task. */
\r
5066 /* The task is being notified without its notify value being
\r
5072 /* Should not get here if all enums are handled.
\r
5073 * Artificially force an assert by testing a value the
\r
5074 * compiler can't assume is const. */
\r
5075 configASSERT( xTickCount == ( TickType_t ) 0 );
\r
5079 traceTASK_NOTIFY_FROM_ISR( uxIndexToNotify );
\r
5081 /* If the task is in the blocked state specifically to wait for a
\r
5082 * notification then unblock it now. */
\r
5083 if( ucOriginalNotifyState == taskWAITING_NOTIFICATION )
\r
5085 /* The task should not have been on an event list. */
\r
5086 configASSERT( listLIST_ITEM_CONTAINER( &( pxTCB->xEventListItem ) ) == NULL );
\r
5088 if( uxSchedulerSuspended == ( UBaseType_t ) pdFALSE )
\r
5090 listREMOVE_ITEM( &( pxTCB->xStateListItem ) );
\r
5091 prvAddTaskToReadyList( pxTCB );
\r
5095 /* The delayed and ready lists cannot be accessed, so hold
\r
5096 * this task pending until the scheduler is resumed. */
\r
5097 listINSERT_END( &( xPendingReadyList ), &( pxTCB->xEventListItem ) );
\r
5100 if( pxTCB->uxPriority > pxCurrentTCB->uxPriority )
\r
5102 /* The notified task has a priority above the currently
\r
5103 * executing task so a yield is required. */
\r
5104 if( pxHigherPriorityTaskWoken != NULL )
\r
5106 *pxHigherPriorityTaskWoken = pdTRUE;
\r
5109 /* Mark that a yield is pending in case the user is not
\r
5110 * using the "xHigherPriorityTaskWoken" parameter to an ISR
\r
5111 * safe FreeRTOS function. */
\r
5112 xYieldPending = pdTRUE;
\r
5116 mtCOVERAGE_TEST_MARKER();
\r
5120 portCLEAR_INTERRUPT_MASK_FROM_ISR( uxSavedInterruptStatus );
\r
5125 #endif /* configUSE_TASK_NOTIFICATIONS */
\r
5126 /*-----------------------------------------------------------*/
\r
5128 #if ( configUSE_TASK_NOTIFICATIONS == 1 )
\r
5130 void vTaskGenericNotifyGiveFromISR( TaskHandle_t xTaskToNotify,
\r
5131 UBaseType_t uxIndexToNotify,
\r
5132 BaseType_t * pxHigherPriorityTaskWoken )
\r
5135 uint8_t ucOriginalNotifyState;
\r
5136 UBaseType_t uxSavedInterruptStatus;
\r
5138 configASSERT( xTaskToNotify );
\r
5139 configASSERT( uxIndexToNotify < configTASK_NOTIFICATION_ARRAY_ENTRIES );
\r
5141 /* RTOS ports that support interrupt nesting have the concept of a
\r
5142 * maximum system call (or maximum API call) interrupt priority.
\r
5143 * Interrupts that are above the maximum system call priority are keep
\r
5144 * permanently enabled, even when the RTOS kernel is in a critical section,
\r
5145 * but cannot make any calls to FreeRTOS API functions. If configASSERT()
\r
5146 * is defined in FreeRTOSConfig.h then
\r
5147 * portASSERT_IF_INTERRUPT_PRIORITY_INVALID() will result in an assertion
\r
5148 * failure if a FreeRTOS API function is called from an interrupt that has
\r
5149 * been assigned a priority above the configured maximum system call
\r
5150 * priority. Only FreeRTOS functions that end in FromISR can be called
\r
5151 * from interrupts that have been assigned a priority at or (logically)
\r
5152 * below the maximum system call interrupt priority. FreeRTOS maintains a
\r
5153 * separate interrupt safe API to ensure interrupt entry is as fast and as
\r
5154 * simple as possible. More information (albeit Cortex-M specific) is
\r
5155 * provided on the following link:
\r
5156 * https://www.FreeRTOS.org/RTOS-Cortex-M3-M4.html */
\r
5157 portASSERT_IF_INTERRUPT_PRIORITY_INVALID();
\r
5159 pxTCB = xTaskToNotify;
\r
5161 uxSavedInterruptStatus = portSET_INTERRUPT_MASK_FROM_ISR();
\r
5163 ucOriginalNotifyState = pxTCB->ucNotifyState[ uxIndexToNotify ];
\r
5164 pxTCB->ucNotifyState[ uxIndexToNotify ] = taskNOTIFICATION_RECEIVED;
\r
5166 /* 'Giving' is equivalent to incrementing a count in a counting
\r
5168 ( pxTCB->ulNotifiedValue[ uxIndexToNotify ] )++;
\r
5170 traceTASK_NOTIFY_GIVE_FROM_ISR( uxIndexToNotify );
\r
5172 /* If the task is in the blocked state specifically to wait for a
\r
5173 * notification then unblock it now. */
\r
5174 if( ucOriginalNotifyState == taskWAITING_NOTIFICATION )
\r
5176 /* The task should not have been on an event list. */
\r
5177 configASSERT( listLIST_ITEM_CONTAINER( &( pxTCB->xEventListItem ) ) == NULL );
\r
5179 if( uxSchedulerSuspended == ( UBaseType_t ) pdFALSE )
\r
5181 listREMOVE_ITEM( &( pxTCB->xStateListItem ) );
\r
5182 prvAddTaskToReadyList( pxTCB );
\r
5186 /* The delayed and ready lists cannot be accessed, so hold
\r
5187 * this task pending until the scheduler is resumed. */
\r
5188 listINSERT_END( &( xPendingReadyList ), &( pxTCB->xEventListItem ) );
\r
5191 if( pxTCB->uxPriority > pxCurrentTCB->uxPriority )
\r
5193 /* The notified task has a priority above the currently
\r
5194 * executing task so a yield is required. */
\r
5195 if( pxHigherPriorityTaskWoken != NULL )
\r
5197 *pxHigherPriorityTaskWoken = pdTRUE;
\r
5200 /* Mark that a yield is pending in case the user is not
\r
5201 * using the "xHigherPriorityTaskWoken" parameter in an ISR
\r
5202 * safe FreeRTOS function. */
\r
5203 xYieldPending = pdTRUE;
\r
5207 mtCOVERAGE_TEST_MARKER();
\r
5211 portCLEAR_INTERRUPT_MASK_FROM_ISR( uxSavedInterruptStatus );
\r
5214 #endif /* configUSE_TASK_NOTIFICATIONS */
\r
5215 /*-----------------------------------------------------------*/
\r
5217 #if ( configUSE_TASK_NOTIFICATIONS == 1 )
\r
5219 BaseType_t xTaskGenericNotifyStateClear( TaskHandle_t xTask,
\r
5220 UBaseType_t uxIndexToClear )
\r
5223 BaseType_t xReturn;
\r
5225 configASSERT( uxIndexToClear < configTASK_NOTIFICATION_ARRAY_ENTRIES );
\r
5227 /* If null is passed in here then it is the calling task that is having
\r
5228 * its notification state cleared. */
\r
5229 pxTCB = prvGetTCBFromHandle( xTask );
\r
5231 taskENTER_CRITICAL();
\r
5233 if( pxTCB->ucNotifyState[ uxIndexToClear ] == taskNOTIFICATION_RECEIVED )
\r
5235 pxTCB->ucNotifyState[ uxIndexToClear ] = taskNOT_WAITING_NOTIFICATION;
\r
5243 taskEXIT_CRITICAL();
\r
5248 #endif /* configUSE_TASK_NOTIFICATIONS */
\r
5249 /*-----------------------------------------------------------*/
\r
5251 #if ( configUSE_TASK_NOTIFICATIONS == 1 )
\r
5253 uint32_t ulTaskGenericNotifyValueClear( TaskHandle_t xTask,
\r
5254 UBaseType_t uxIndexToClear,
\r
5255 uint32_t ulBitsToClear )
\r
5258 uint32_t ulReturn;
\r
5260 /* If null is passed in here then it is the calling task that is having
\r
5261 * its notification state cleared. */
\r
5262 pxTCB = prvGetTCBFromHandle( xTask );
\r
5264 taskENTER_CRITICAL();
\r
5266 /* Return the notification as it was before the bits were cleared,
\r
5267 * then clear the bit mask. */
\r
5268 ulReturn = pxTCB->ulNotifiedValue[ uxIndexToClear ];
\r
5269 pxTCB->ulNotifiedValue[ uxIndexToClear ] &= ~ulBitsToClear;
\r
5271 taskEXIT_CRITICAL();
\r
5276 #endif /* configUSE_TASK_NOTIFICATIONS */
\r
5277 /*-----------------------------------------------------------*/
\r
5279 #if ( ( configGENERATE_RUN_TIME_STATS == 1 ) && ( INCLUDE_xTaskGetIdleTaskHandle == 1 ) )
\r
5281 configRUN_TIME_COUNTER_TYPE ulTaskGetIdleRunTimeCounter( void )
\r
5283 return xIdleTaskHandle->ulRunTimeCounter;
\r
5287 /*-----------------------------------------------------------*/
\r
5289 #if ( ( configGENERATE_RUN_TIME_STATS == 1 ) && ( INCLUDE_xTaskGetIdleTaskHandle == 1 ) )
\r
5291 configRUN_TIME_COUNTER_TYPE ulTaskGetIdleRunTimePercent( void )
\r
5293 configRUN_TIME_COUNTER_TYPE ulTotalTime, ulReturn;
\r
5295 ulTotalTime = portGET_RUN_TIME_COUNTER_VALUE();
\r
5297 /* For percentage calculations. */
\r
5298 ulTotalTime /= ( configRUN_TIME_COUNTER_TYPE ) 100;
\r
5300 /* Avoid divide by zero errors. */
\r
5301 if( ulTotalTime > ( configRUN_TIME_COUNTER_TYPE ) 0 )
\r
5303 ulReturn = xIdleTaskHandle->ulRunTimeCounter / ulTotalTime;
\r
5313 #endif /* if ( ( configGENERATE_RUN_TIME_STATS == 1 ) && ( INCLUDE_xTaskGetIdleTaskHandle == 1 ) ) */
\r
5314 /*-----------------------------------------------------------*/
\r
5316 static void prvAddCurrentTaskToDelayedList( TickType_t xTicksToWait,
\r
5317 const BaseType_t xCanBlockIndefinitely )
\r
5319 TickType_t xTimeToWake;
\r
5320 const TickType_t xConstTickCount = xTickCount;
\r
5322 #if ( INCLUDE_xTaskAbortDelay == 1 )
\r
5324 /* About to enter a delayed list, so ensure the ucDelayAborted flag is
\r
5325 * reset to pdFALSE so it can be detected as having been set to pdTRUE
\r
5326 * when the task leaves the Blocked state. */
\r
5327 pxCurrentTCB->ucDelayAborted = pdFALSE;
\r
5331 /* Remove the task from the ready list before adding it to the blocked list
\r
5332 * as the same list item is used for both lists. */
\r
5333 if( uxListRemove( &( pxCurrentTCB->xStateListItem ) ) == ( UBaseType_t ) 0 )
\r
5335 /* The current task must be in a ready list, so there is no need to
\r
5336 * check, and the port reset macro can be called directly. */
\r
5337 portRESET_READY_PRIORITY( pxCurrentTCB->uxPriority, uxTopReadyPriority ); /*lint !e931 pxCurrentTCB cannot change as it is the calling task. pxCurrentTCB->uxPriority and uxTopReadyPriority cannot change as called with scheduler suspended or in a critical section. */
\r
5341 mtCOVERAGE_TEST_MARKER();
\r
5344 #if ( INCLUDE_vTaskSuspend == 1 )
\r
5346 if( ( xTicksToWait == portMAX_DELAY ) && ( xCanBlockIndefinitely != pdFALSE ) )
\r
5348 /* Add the task to the suspended task list instead of a delayed task
\r
5349 * list to ensure it is not woken by a timing event. It will block
\r
5350 * indefinitely. */
\r
5351 listINSERT_END( &xSuspendedTaskList, &( pxCurrentTCB->xStateListItem ) );
\r
5355 /* Calculate the time at which the task should be woken if the event
\r
5356 * does not occur. This may overflow but this doesn't matter, the
\r
5357 * kernel will manage it correctly. */
\r
5358 xTimeToWake = xConstTickCount + xTicksToWait;
\r
5360 /* The list item will be inserted in wake time order. */
\r
5361 listSET_LIST_ITEM_VALUE( &( pxCurrentTCB->xStateListItem ), xTimeToWake );
\r
5363 if( xTimeToWake < xConstTickCount )
\r
5365 /* Wake time has overflowed. Place this item in the overflow
\r
5367 vListInsert( pxOverflowDelayedTaskList, &( pxCurrentTCB->xStateListItem ) );
\r
5371 /* The wake time has not overflowed, so the current block list
\r
5373 vListInsert( pxDelayedTaskList, &( pxCurrentTCB->xStateListItem ) );
\r
5375 /* If the task entering the blocked state was placed at the
\r
5376 * head of the list of blocked tasks then xNextTaskUnblockTime
\r
5377 * needs to be updated too. */
\r
5378 if( xTimeToWake < xNextTaskUnblockTime )
\r
5380 xNextTaskUnblockTime = xTimeToWake;
\r
5384 mtCOVERAGE_TEST_MARKER();
\r
5389 #else /* INCLUDE_vTaskSuspend */
\r
5391 /* Calculate the time at which the task should be woken if the event
\r
5392 * does not occur. This may overflow but this doesn't matter, the kernel
\r
5393 * will manage it correctly. */
\r
5394 xTimeToWake = xConstTickCount + xTicksToWait;
\r
5396 /* The list item will be inserted in wake time order. */
\r
5397 listSET_LIST_ITEM_VALUE( &( pxCurrentTCB->xStateListItem ), xTimeToWake );
\r
5399 if( xTimeToWake < xConstTickCount )
\r
5401 /* Wake time has overflowed. Place this item in the overflow list. */
\r
5402 vListInsert( pxOverflowDelayedTaskList, &( pxCurrentTCB->xStateListItem ) );
\r
5406 /* The wake time has not overflowed, so the current block list is used. */
\r
5407 vListInsert( pxDelayedTaskList, &( pxCurrentTCB->xStateListItem ) );
\r
5409 /* If the task entering the blocked state was placed at the head of the
\r
5410 * list of blocked tasks then xNextTaskUnblockTime needs to be updated
\r
5412 if( xTimeToWake < xNextTaskUnblockTime )
\r
5414 xNextTaskUnblockTime = xTimeToWake;
\r
5418 mtCOVERAGE_TEST_MARKER();
\r
5422 /* Avoid compiler warning when INCLUDE_vTaskSuspend is not 1. */
\r
5423 ( void ) xCanBlockIndefinitely;
\r
5425 #endif /* INCLUDE_vTaskSuspend */
\r
5428 /* Code below here allows additional code to be inserted into this source file,
\r
5429 * especially where access to file scope functions and data is needed (for example
\r
5430 * when performing module tests). */
\r
5432 #ifdef FREERTOS_MODULE_TEST
\r
5433 #include "tasks_test_access_functions.h"
\r
5437 #if ( configINCLUDE_FREERTOS_TASK_C_ADDITIONS_H == 1 )
\r
5439 #include "freertos_tasks_c_additions.h"
\r
5441 #ifdef FREERTOS_TASKS_C_ADDITIONS_INIT
\r
5442 static void freertos_tasks_c_additions_init( void )
\r
5444 FREERTOS_TASKS_C_ADDITIONS_INIT();
\r
5448 #endif /* if ( configINCLUDE_FREERTOS_TASK_C_ADDITIONS_H == 1 ) */
\r
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