2 FreeRTOS V8.1.0 - Copyright (C) 2014 Real Time Engineers Ltd.
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5 VISIT http://www.FreeRTOS.org TO ENSURE YOU ARE USING THE LATEST VERSION.
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7 ***************************************************************************
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9 * FreeRTOS provides completely free yet professionally developed, *
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10 * robust, strictly quality controlled, supported, and cross *
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11 * platform software that has become a de facto standard. *
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13 * Help yourself get started quickly and support the FreeRTOS *
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14 * project by purchasing a FreeRTOS tutorial book, reference *
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15 * manual, or both from: http://www.FreeRTOS.org/Documentation *
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19 ***************************************************************************
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21 This file is part of the FreeRTOS distribution.
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23 FreeRTOS is free software; you can redistribute it and/or modify it under
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24 the terms of the GNU General Public License (version 2) as published by the
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25 Free Software Foundation >>!AND MODIFIED BY!<< the FreeRTOS exception.
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27 >>! NOTE: The modification to the GPL is included to allow you to !<<
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28 >>! distribute a combined work that includes FreeRTOS without being !<<
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29 >>! obliged to provide the source code for proprietary components !<<
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30 >>! outside of the FreeRTOS kernel. !<<
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32 FreeRTOS is distributed in the hope that it will be useful, but WITHOUT ANY
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33 WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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34 FOR A PARTICULAR PURPOSE. Full license text is available from the following
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35 link: http://www.freertos.org/a00114.html
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39 ***************************************************************************
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41 * Having a problem? Start by reading the FAQ "My application does *
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42 * not run, what could be wrong?" *
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44 * http://www.FreeRTOS.org/FAQHelp.html *
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46 ***************************************************************************
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48 http://www.FreeRTOS.org - Documentation, books, training, latest versions,
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49 license and Real Time Engineers Ltd. contact details.
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51 http://www.FreeRTOS.org/plus - A selection of FreeRTOS ecosystem products,
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52 including FreeRTOS+Trace - an indispensable productivity tool, a DOS
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53 compatible FAT file system, and our tiny thread aware UDP/IP stack.
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55 http://www.OpenRTOS.com - Real Time Engineers ltd license FreeRTOS to High
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56 Integrity Systems to sell under the OpenRTOS brand. Low cost OpenRTOS
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57 licenses offer ticketed support, indemnification and middleware.
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59 http://www.SafeRTOS.com - High Integrity Systems also provide a safety
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60 engineered and independently SIL3 certified version for use in safety and
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61 mission critical applications that require provable dependability.
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66 /* Standard includes. */
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69 /* Defining MPU_WRAPPERS_INCLUDED_FROM_API_FILE prevents task.h from redefining
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70 all the API functions to use the MPU wrappers. That should only be done when
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71 task.h is included from an application file. */
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72 #define MPU_WRAPPERS_INCLUDED_FROM_API_FILE
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74 /* FreeRTOS includes. */
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75 #include "FreeRTOS.h"
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78 #include "event_groups.h"
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80 /* Lint e961 and e750 are suppressed as a MISRA exception justified because the
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81 MPU ports require MPU_WRAPPERS_INCLUDED_FROM_API_FILE to be defined for the
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82 header files above, but not in this file, in order to generate the correct
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83 privileged Vs unprivileged linkage and placement. */
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84 #undef MPU_WRAPPERS_INCLUDED_FROM_API_FILE /*lint !e961 !e750. */
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86 #if ( INCLUDE_xEventGroupSetBitFromISR == 1 ) && ( configUSE_TIMERS == 0 )
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87 #error configUSE_TIMERS must be set to 1 to make the xEventGroupSetBitFromISR() function available.
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90 #if ( INCLUDE_xEventGroupSetBitFromISR == 1 ) && ( INCLUDE_xTimerPendFunctionCall == 0 )
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91 #error INCLUDE_xTimerPendFunctionCall must also be set to one to make the xEventGroupSetBitFromISR() function available.
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94 /* The following bit fields convey control information in a task's event list
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95 item value. It is important they don't clash with the
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96 taskEVENT_LIST_ITEM_VALUE_IN_USE definition. */
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97 #if configUSE_16_BIT_TICKS == 1
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98 #define eventCLEAR_EVENTS_ON_EXIT_BIT 0x0100U
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99 #define eventUNBLOCKED_DUE_TO_BIT_SET 0x0200U
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100 #define eventWAIT_FOR_ALL_BITS 0x0400U
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101 #define eventEVENT_BITS_CONTROL_BYTES 0xff00U
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103 #define eventCLEAR_EVENTS_ON_EXIT_BIT 0x01000000UL
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104 #define eventUNBLOCKED_DUE_TO_BIT_SET 0x02000000UL
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105 #define eventWAIT_FOR_ALL_BITS 0x04000000UL
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106 #define eventEVENT_BITS_CONTROL_BYTES 0xff000000UL
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109 typedef struct xEventGroupDefinition
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111 EventBits_t uxEventBits;
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112 List_t xTasksWaitingForBits; /*< List of tasks waiting for a bit to be set. */
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114 #if( configUSE_TRACE_FACILITY == 1 )
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115 UBaseType_t uxEventGroupNumber;
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120 /*-----------------------------------------------------------*/
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123 * Test the bits set in uxCurrentEventBits to see if the wait condition is met.
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124 * The wait condition is defined by xWaitForAllBits. If xWaitForAllBits is
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125 * pdTRUE then the wait condition is met if all the bits set in uxBitsToWaitFor
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126 * are also set in uxCurrentEventBits. If xWaitForAllBits is pdFALSE then the
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127 * wait condition is met if any of the bits set in uxBitsToWait for are also set
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128 * in uxCurrentEventBits.
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130 static BaseType_t prvTestWaitCondition( const EventBits_t uxCurrentEventBits, const EventBits_t uxBitsToWaitFor, const BaseType_t xWaitForAllBits );
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132 /*-----------------------------------------------------------*/
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134 EventGroupHandle_t xEventGroupCreate( void )
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136 EventGroup_t *pxEventBits;
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138 pxEventBits = pvPortMalloc( sizeof( EventGroup_t ) );
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139 if( pxEventBits != NULL )
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141 pxEventBits->uxEventBits = 0;
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142 vListInitialise( &( pxEventBits->xTasksWaitingForBits ) );
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143 traceEVENT_GROUP_CREATE( pxEventBits );
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147 traceEVENT_GROUP_CREATE_FAILED();
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150 return ( EventGroupHandle_t ) pxEventBits;
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152 /*-----------------------------------------------------------*/
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154 EventBits_t xEventGroupSync( EventGroupHandle_t xEventGroup, const EventBits_t uxBitsToSet, const EventBits_t uxBitsToWaitFor, TickType_t xTicksToWait )
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156 EventBits_t uxOriginalBitValue, uxReturn;
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157 EventGroup_t *pxEventBits = ( EventGroup_t * ) xEventGroup;
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158 BaseType_t xAlreadyYielded;
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159 BaseType_t xTimeoutOccurred = pdFALSE;
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161 configASSERT( ( uxBitsToWaitFor & eventEVENT_BITS_CONTROL_BYTES ) == 0 );
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162 configASSERT( uxBitsToWaitFor != 0 );
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163 #if ( ( INCLUDE_xTaskGetSchedulerState == 1 ) || ( configUSE_TIMERS == 1 ) )
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165 configASSERT( !( ( xTaskGetSchedulerState() == taskSCHEDULER_SUSPENDED ) && ( xTicksToWait != 0 ) ) );
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171 uxOriginalBitValue = pxEventBits->uxEventBits;
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173 ( void ) xEventGroupSetBits( xEventGroup, uxBitsToSet );
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175 if( ( ( uxOriginalBitValue | uxBitsToSet ) & uxBitsToWaitFor ) == uxBitsToWaitFor )
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177 /* All the rendezvous bits are now set - no need to block. */
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178 uxReturn = ( uxOriginalBitValue | uxBitsToSet );
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180 /* Rendezvous always clear the bits. They will have been cleared
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181 already unless this is the only task in the rendezvous. */
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182 pxEventBits->uxEventBits &= ~uxBitsToWaitFor;
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188 if( xTicksToWait != ( TickType_t ) 0 )
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190 traceEVENT_GROUP_SYNC_BLOCK( xEventGroup, uxBitsToSet, uxBitsToWaitFor );
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192 /* Store the bits that the calling task is waiting for in the
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193 task's event list item so the kernel knows when a match is
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194 found. Then enter the blocked state. */
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195 vTaskPlaceOnUnorderedEventList( &( pxEventBits->xTasksWaitingForBits ), ( uxBitsToWaitFor | eventCLEAR_EVENTS_ON_EXIT_BIT | eventWAIT_FOR_ALL_BITS ), xTicksToWait );
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197 /* This assignment is obsolete as uxReturn will get set after
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198 the task unblocks, but some compilers mistakenly generate a
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199 warning about uxReturn being returned without being set if the
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200 assignment is omitted. */
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205 /* The rendezvous bits were not set, but no block time was
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206 specified - just return the current event bit value. */
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207 uxReturn = pxEventBits->uxEventBits;
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211 xAlreadyYielded = xTaskResumeAll();
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213 if( xTicksToWait != ( TickType_t ) 0 )
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215 if( xAlreadyYielded == pdFALSE )
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217 portYIELD_WITHIN_API();
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221 mtCOVERAGE_TEST_MARKER();
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224 /* The task blocked to wait for its required bits to be set - at this
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225 point either the required bits were set or the block time expired. If
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226 the required bits were set they will have been stored in the task's
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227 event list item, and they should now be retrieved then cleared. */
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228 uxReturn = uxTaskResetEventItemValue();
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230 if( ( uxReturn & eventUNBLOCKED_DUE_TO_BIT_SET ) == ( EventBits_t ) 0 )
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232 /* The task timed out, just return the current event bit value. */
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233 taskENTER_CRITICAL();
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235 uxReturn = pxEventBits->uxEventBits;
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237 /* Although the task got here because it timed out before the
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238 bits it was waiting for were set, it is possible that since it
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239 unblocked another task has set the bits. If this is the case
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240 then it needs to clear the bits before exiting. */
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241 if( ( uxReturn & uxBitsToWaitFor ) == uxBitsToWaitFor )
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243 pxEventBits->uxEventBits &= ~uxBitsToWaitFor;
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247 mtCOVERAGE_TEST_MARKER();
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250 taskEXIT_CRITICAL();
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252 xTimeoutOccurred = pdTRUE;
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256 /* The task unblocked because the bits were set. */
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259 /* Control bits might be set as the task had blocked should not be
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261 uxReturn &= ~eventEVENT_BITS_CONTROL_BYTES;
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264 traceEVENT_GROUP_SYNC_END( xEventGroup, uxBitsToSet, uxBitsToWaitFor, xTimeoutOccurred );
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268 /*-----------------------------------------------------------*/
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270 EventBits_t xEventGroupWaitBits( EventGroupHandle_t xEventGroup, const EventBits_t uxBitsToWaitFor, const BaseType_t xClearOnExit, const BaseType_t xWaitForAllBits, TickType_t xTicksToWait )
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272 EventGroup_t *pxEventBits = ( EventGroup_t * ) xEventGroup;
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273 EventBits_t uxReturn, uxControlBits = 0;
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274 BaseType_t xWaitConditionMet, xAlreadyYielded;
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275 BaseType_t xTimeoutOccurred = pdFALSE;
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277 /* Check the user is not attempting to wait on the bits used by the kernel
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278 itself, and that at least one bit is being requested. */
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279 configASSERT( ( uxBitsToWaitFor & eventEVENT_BITS_CONTROL_BYTES ) == 0 );
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280 configASSERT( uxBitsToWaitFor != 0 );
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281 #if ( ( INCLUDE_xTaskGetSchedulerState == 1 ) || ( configUSE_TIMERS == 1 ) )
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283 configASSERT( !( ( xTaskGetSchedulerState() == taskSCHEDULER_SUSPENDED ) && ( xTicksToWait != 0 ) ) );
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289 const EventBits_t uxCurrentEventBits = pxEventBits->uxEventBits;
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291 /* Check to see if the wait condition is already met or not. */
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292 xWaitConditionMet = prvTestWaitCondition( uxCurrentEventBits, uxBitsToWaitFor, xWaitForAllBits );
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294 if( xWaitConditionMet != pdFALSE )
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296 /* The wait condition has already been met so there is no need to
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298 uxReturn = uxCurrentEventBits;
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299 xTicksToWait = ( TickType_t ) 0;
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301 /* Clear the wait bits if requested to do so. */
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302 if( xClearOnExit != pdFALSE )
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304 pxEventBits->uxEventBits &= ~uxBitsToWaitFor;
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308 mtCOVERAGE_TEST_MARKER();
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311 else if( xTicksToWait == ( TickType_t ) 0 )
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313 /* The wait condition has not been met, but no block time was
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314 specified, so just return the current value. */
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315 uxReturn = uxCurrentEventBits;
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319 /* The task is going to block to wait for its required bits to be
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320 set. uxControlBits are used to remember the specified behaviour of
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321 this call to xEventGroupWaitBits() - for use when the event bits
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322 unblock the task. */
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323 if( xClearOnExit != pdFALSE )
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325 uxControlBits |= eventCLEAR_EVENTS_ON_EXIT_BIT;
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329 mtCOVERAGE_TEST_MARKER();
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332 if( xWaitForAllBits != pdFALSE )
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334 uxControlBits |= eventWAIT_FOR_ALL_BITS;
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338 mtCOVERAGE_TEST_MARKER();
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341 /* Store the bits that the calling task is waiting for in the
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342 task's event list item so the kernel knows when a match is
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343 found. Then enter the blocked state. */
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344 vTaskPlaceOnUnorderedEventList( &( pxEventBits->xTasksWaitingForBits ), ( uxBitsToWaitFor | uxControlBits ), xTicksToWait );
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346 /* This is obsolete as it will get set after the task unblocks, but
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347 some compilers mistakenly generate a warning about the variable
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348 being returned without being set if it is not done. */
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351 traceEVENT_GROUP_WAIT_BITS_BLOCK( xEventGroup, uxBitsToWaitFor );
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354 xAlreadyYielded = xTaskResumeAll();
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356 if( xTicksToWait != ( TickType_t ) 0 )
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358 if( xAlreadyYielded == pdFALSE )
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360 portYIELD_WITHIN_API();
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364 mtCOVERAGE_TEST_MARKER();
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367 /* The task blocked to wait for its required bits to be set - at this
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368 point either the required bits were set or the block time expired. If
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369 the required bits were set they will have been stored in the task's
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370 event list item, and they should now be retrieved then cleared. */
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371 uxReturn = uxTaskResetEventItemValue();
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373 if( ( uxReturn & eventUNBLOCKED_DUE_TO_BIT_SET ) == ( EventBits_t ) 0 )
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375 taskENTER_CRITICAL();
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377 /* The task timed out, just return the current event bit value. */
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378 uxReturn = pxEventBits->uxEventBits;
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380 /* It is possible that the event bits were updated between this
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381 task leaving the Blocked state and running again. */
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382 if( prvTestWaitCondition( uxReturn, uxBitsToWaitFor, xWaitForAllBits ) != pdFALSE )
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384 if( xClearOnExit != pdFALSE )
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386 pxEventBits->uxEventBits &= ~uxBitsToWaitFor;
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390 mtCOVERAGE_TEST_MARKER();
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395 mtCOVERAGE_TEST_MARKER();
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398 taskEXIT_CRITICAL();
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400 /* Prevent compiler warnings when trace macros are not used. */
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401 xTimeoutOccurred = pdFALSE;
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405 /* The task unblocked because the bits were set. */
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408 /* The task blocked so control bits may have been set. */
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409 uxReturn &= ~eventEVENT_BITS_CONTROL_BYTES;
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411 traceEVENT_GROUP_WAIT_BITS_END( xEventGroup, uxBitsToWaitFor, xTimeoutOccurred );
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415 /*-----------------------------------------------------------*/
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417 EventBits_t xEventGroupClearBits( EventGroupHandle_t xEventGroup, const EventBits_t uxBitsToClear )
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419 EventGroup_t *pxEventBits = ( EventGroup_t * ) xEventGroup;
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420 EventBits_t uxReturn;
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422 /* Check the user is not attempting to clear the bits used by the kernel
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424 configASSERT( ( uxBitsToClear & eventEVENT_BITS_CONTROL_BYTES ) == 0 );
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426 taskENTER_CRITICAL();
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428 traceEVENT_GROUP_CLEAR_BITS( xEventGroup, uxBitsToClear );
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430 /* The value returned is the event group value prior to the bits being
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432 uxReturn = pxEventBits->uxEventBits;
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434 /* Clear the bits. */
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435 pxEventBits->uxEventBits &= ~uxBitsToClear;
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437 taskEXIT_CRITICAL();
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441 /*-----------------------------------------------------------*/
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443 #if ( ( configUSE_TRACE_FACILITY == 1 ) && ( INCLUDE_xTimerPendFunctionCall == 1 ) && ( configUSE_TIMERS == 1 ) )
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445 BaseType_t xEventGroupClearBitsFromISR( EventGroupHandle_t xEventGroup, const EventBits_t uxBitsToClear )
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447 BaseType_t xReturn;
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449 traceEVENT_GROUP_CLEAR_BITS_FROM_ISR( xEventGroup, uxBitsToClear );
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450 xReturn = xTimerPendFunctionCallFromISR( vEventGroupClearBitsCallback, ( void * ) xEventGroup, ( uint32_t ) uxBitsToClear, NULL );
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456 /*-----------------------------------------------------------*/
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458 EventBits_t xEventGroupGetBitsFromISR( EventGroupHandle_t xEventGroup )
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460 UBaseType_t uxSavedInterruptStatus;
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461 EventGroup_t *pxEventBits = ( EventGroup_t * ) xEventGroup;
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462 EventBits_t uxReturn;
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464 uxSavedInterruptStatus = portSET_INTERRUPT_MASK_FROM_ISR();
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466 uxReturn = pxEventBits->uxEventBits;
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468 portCLEAR_INTERRUPT_MASK_FROM_ISR( uxSavedInterruptStatus );
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472 /*-----------------------------------------------------------*/
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474 EventBits_t xEventGroupSetBits( EventGroupHandle_t xEventGroup, const EventBits_t uxBitsToSet )
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476 ListItem_t *pxListItem, *pxNext;
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477 ListItem_t const *pxListEnd;
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479 EventBits_t uxBitsToClear = 0, uxBitsWaitedFor, uxControlBits;
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480 EventGroup_t *pxEventBits = ( EventGroup_t * ) xEventGroup;
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481 BaseType_t xMatchFound = pdFALSE;
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483 /* Check the user is not attempting to set the bits used by the kernel
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485 configASSERT( ( uxBitsToSet & eventEVENT_BITS_CONTROL_BYTES ) == 0 );
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487 pxList = &( pxEventBits->xTasksWaitingForBits );
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488 pxListEnd = listGET_END_MARKER( pxList ); /*lint !e826 !e740 The mini list structure is used as the list end to save RAM. This is checked and valid. */
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491 traceEVENT_GROUP_SET_BITS( xEventGroup, uxBitsToSet );
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493 pxListItem = listGET_HEAD_ENTRY( pxList );
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495 /* Set the bits. */
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496 pxEventBits->uxEventBits |= uxBitsToSet;
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498 /* See if the new bit value should unblock any tasks. */
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499 while( pxListItem != pxListEnd )
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501 pxNext = listGET_NEXT( pxListItem );
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502 uxBitsWaitedFor = listGET_LIST_ITEM_VALUE( pxListItem );
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503 xMatchFound = pdFALSE;
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505 /* Split the bits waited for from the control bits. */
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506 uxControlBits = uxBitsWaitedFor & eventEVENT_BITS_CONTROL_BYTES;
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507 uxBitsWaitedFor &= ~eventEVENT_BITS_CONTROL_BYTES;
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509 if( ( uxControlBits & eventWAIT_FOR_ALL_BITS ) == ( EventBits_t ) 0 )
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511 /* Just looking for single bit being set. */
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512 if( ( uxBitsWaitedFor & pxEventBits->uxEventBits ) != ( EventBits_t ) 0 )
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514 xMatchFound = pdTRUE;
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518 mtCOVERAGE_TEST_MARKER();
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521 else if( ( uxBitsWaitedFor & pxEventBits->uxEventBits ) == uxBitsWaitedFor )
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523 /* All bits are set. */
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524 xMatchFound = pdTRUE;
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528 /* Need all bits to be set, but not all the bits were set. */
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531 if( xMatchFound != pdFALSE )
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533 /* The bits match. Should the bits be cleared on exit? */
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534 if( ( uxControlBits & eventCLEAR_EVENTS_ON_EXIT_BIT ) != ( EventBits_t ) 0 )
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536 uxBitsToClear |= uxBitsWaitedFor;
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540 mtCOVERAGE_TEST_MARKER();
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543 /* Store the actual event flag value in the task's event list
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544 item before removing the task from the event list. The
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545 eventUNBLOCKED_DUE_TO_BIT_SET bit is set so the task knows
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546 that is was unblocked due to its required bits matching, rather
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547 than because it timed out. */
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548 ( void ) xTaskRemoveFromUnorderedEventList( pxListItem, pxEventBits->uxEventBits | eventUNBLOCKED_DUE_TO_BIT_SET );
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551 /* Move onto the next list item. Note pxListItem->pxNext is not
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552 used here as the list item may have been removed from the event list
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553 and inserted into the ready/pending reading list. */
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554 pxListItem = pxNext;
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557 /* Clear any bits that matched when the eventCLEAR_EVENTS_ON_EXIT_BIT
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558 bit was set in the control word. */
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559 pxEventBits->uxEventBits &= ~uxBitsToClear;
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561 ( void ) xTaskResumeAll();
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563 return pxEventBits->uxEventBits;
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565 /*-----------------------------------------------------------*/
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567 void vEventGroupDelete( EventGroupHandle_t xEventGroup )
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569 EventGroup_t *pxEventBits = ( EventGroup_t * ) xEventGroup;
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570 const List_t *pxTasksWaitingForBits = &( pxEventBits->xTasksWaitingForBits );
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574 traceEVENT_GROUP_DELETE( xEventGroup );
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576 while( listCURRENT_LIST_LENGTH( pxTasksWaitingForBits ) > ( UBaseType_t ) 0 )
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578 /* Unblock the task, returning 0 as the event list is being deleted
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579 and cannot therefore have any bits set. */
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580 configASSERT( pxTasksWaitingForBits->xListEnd.pxNext != ( ListItem_t * ) &( pxTasksWaitingForBits->xListEnd ) );
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581 ( void ) xTaskRemoveFromUnorderedEventList( pxTasksWaitingForBits->xListEnd.pxNext, eventUNBLOCKED_DUE_TO_BIT_SET );
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584 vPortFree( pxEventBits );
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586 ( void ) xTaskResumeAll();
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588 /*-----------------------------------------------------------*/
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590 /* For internal use only - execute a 'set bits' command that was pended from
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592 void vEventGroupSetBitsCallback( void *pvEventGroup, const uint32_t ulBitsToSet )
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594 ( void ) xEventGroupSetBits( pvEventGroup, ( EventBits_t ) ulBitsToSet );
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596 /*-----------------------------------------------------------*/
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598 /* For internal use only - execute a 'clear bits' command that was pended from
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600 void vEventGroupClearBitsCallback( void *pvEventGroup, const uint32_t ulBitsToClear )
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602 ( void ) xEventGroupClearBits( pvEventGroup, ( EventBits_t ) ulBitsToClear );
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604 /*-----------------------------------------------------------*/
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606 static BaseType_t prvTestWaitCondition( const EventBits_t uxCurrentEventBits, const EventBits_t uxBitsToWaitFor, const BaseType_t xWaitForAllBits )
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608 BaseType_t xWaitConditionMet = pdFALSE;
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610 if( xWaitForAllBits == pdFALSE )
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612 /* Task only has to wait for one bit within uxBitsToWaitFor to be
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613 set. Is one already set? */
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614 if( ( uxCurrentEventBits & uxBitsToWaitFor ) != ( EventBits_t ) 0 )
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616 xWaitConditionMet = pdTRUE;
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620 mtCOVERAGE_TEST_MARKER();
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625 /* Task has to wait for all the bits in uxBitsToWaitFor to be set.
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626 Are they set already? */
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627 if( ( uxCurrentEventBits & uxBitsToWaitFor ) == uxBitsToWaitFor )
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629 xWaitConditionMet = pdTRUE;
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633 mtCOVERAGE_TEST_MARKER();
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637 return xWaitConditionMet;
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639 /*-----------------------------------------------------------*/
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641 #if ( ( configUSE_TRACE_FACILITY == 1 ) && ( INCLUDE_xTimerPendFunctionCall == 1 ) && ( configUSE_TIMERS == 1 ) )
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643 BaseType_t xEventGroupSetBitsFromISR( EventGroupHandle_t xEventGroup, const EventBits_t uxBitsToSet, BaseType_t *pxHigherPriorityTaskWoken )
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645 BaseType_t xReturn;
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647 traceEVENT_GROUP_SET_BITS_FROM_ISR( xEventGroup, uxBitsToSet );
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648 xReturn = xTimerPendFunctionCallFromISR( vEventGroupSetBitsCallback, ( void * ) xEventGroup, ( uint32_t ) uxBitsToSet, pxHigherPriorityTaskWoken );
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654 /*-----------------------------------------------------------*/
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656 #if (configUSE_TRACE_FACILITY == 1)
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658 UBaseType_t uxEventGroupGetNumber( void* xEventGroup )
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660 UBaseType_t xReturn;
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661 EventGroup_t *pxEventBits = ( EventGroup_t * ) xEventGroup;
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663 if( xEventGroup == NULL )
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669 xReturn = pxEventBits->uxEventGroupNumber;
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