| /* |
| * FreeRTOS Kernel <DEVELOPMENT BRANCH> |
| * Copyright (C) 2021 Amazon.com, Inc. or its affiliates. All Rights Reserved. |
| * |
| * SPDX-License-Identifier: MIT |
| * |
| * Permission is hereby granted, free of charge, to any person obtaining a copy of |
| * this software and associated documentation files (the "Software"), to deal in |
| * the Software without restriction, including without limitation the rights to |
| * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of |
| * the Software, and to permit persons to whom the Software is furnished to do so, |
| * subject to the following conditions: |
| * |
| * The above copyright notice and this permission notice shall be included in all |
| * copies or substantial portions of the Software. |
| * |
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS |
| * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR |
| * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER |
| * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN |
| * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. |
| * |
| * https://www.FreeRTOS.org |
| * https://github.com/FreeRTOS |
| * |
| */ |
| |
| /* Standard includes. */ |
| #include <stdlib.h> |
| |
| /* Defining MPU_WRAPPERS_INCLUDED_FROM_API_FILE prevents task.h from redefining |
| * all the API functions to use the MPU wrappers. That should only be done when |
| * task.h is included from an application file. */ |
| #define MPU_WRAPPERS_INCLUDED_FROM_API_FILE |
| |
| /* FreeRTOS includes. */ |
| #include "FreeRTOS.h" |
| #include "task.h" |
| #include "timers.h" |
| #include "event_groups.h" |
| |
| /* Lint e961, e750 and e9021 are suppressed as a MISRA exception justified |
| * because the MPU ports require MPU_WRAPPERS_INCLUDED_FROM_API_FILE to be defined |
| * for the header files above, but not in this file, in order to generate the |
| * correct privileged Vs unprivileged linkage and placement. */ |
| #undef MPU_WRAPPERS_INCLUDED_FROM_API_FILE /*lint !e961 !e750 !e9021 See comment above. */ |
| |
| /* The following bit fields convey control information in a task's event list |
| * item value. It is important they don't clash with the |
| * taskEVENT_LIST_ITEM_VALUE_IN_USE definition. */ |
| #if ( configTICK_TYPE_WIDTH_IN_BITS == TICK_TYPE_WIDTH_16_BITS ) |
| #define eventCLEAR_EVENTS_ON_EXIT_BIT 0x0100U |
| #define eventUNBLOCKED_DUE_TO_BIT_SET 0x0200U |
| #define eventWAIT_FOR_ALL_BITS 0x0400U |
| #define eventEVENT_BITS_CONTROL_BYTES 0xff00U |
| #elif ( configTICK_TYPE_WIDTH_IN_BITS == TICK_TYPE_WIDTH_32_BITS ) |
| #define eventCLEAR_EVENTS_ON_EXIT_BIT 0x01000000UL |
| #define eventUNBLOCKED_DUE_TO_BIT_SET 0x02000000UL |
| #define eventWAIT_FOR_ALL_BITS 0x04000000UL |
| #define eventEVENT_BITS_CONTROL_BYTES 0xff000000UL |
| #elif ( configTICK_TYPE_WIDTH_IN_BITS == TICK_TYPE_WIDTH_64_BITS ) |
| #define eventCLEAR_EVENTS_ON_EXIT_BIT 0x0100000000000000ULL |
| #define eventUNBLOCKED_DUE_TO_BIT_SET 0x0200000000000000ULL |
| #define eventWAIT_FOR_ALL_BITS 0x0400000000000000ULL |
| #define eventEVENT_BITS_CONTROL_BYTES 0xff00000000000000ULL |
| #endif /* if ( configTICK_TYPE_WIDTH_IN_BITS == TICK_TYPE_WIDTH_16_BITS ) */ |
| |
| typedef struct EventGroupDef_t |
| { |
| EventBits_t uxEventBits; |
| List_t xTasksWaitingForBits; /**< List of tasks waiting for a bit to be set. */ |
| |
| #if ( configUSE_TRACE_FACILITY == 1 ) |
| UBaseType_t uxEventGroupNumber; |
| #endif |
| |
| #if ( ( configSUPPORT_STATIC_ALLOCATION == 1 ) && ( configSUPPORT_DYNAMIC_ALLOCATION == 1 ) ) |
| uint8_t ucStaticallyAllocated; /**< Set to pdTRUE if the event group is statically allocated to ensure no attempt is made to free the memory. */ |
| #endif |
| } EventGroup_t; |
| |
| /*-----------------------------------------------------------*/ |
| |
| /* |
| * Test the bits set in uxCurrentEventBits to see if the wait condition is met. |
| * The wait condition is defined by xWaitForAllBits. If xWaitForAllBits is |
| * pdTRUE then the wait condition is met if all the bits set in uxBitsToWaitFor |
| * are also set in uxCurrentEventBits. If xWaitForAllBits is pdFALSE then the |
| * wait condition is met if any of the bits set in uxBitsToWait for are also set |
| * in uxCurrentEventBits. |
| */ |
| static BaseType_t prvTestWaitCondition( const EventBits_t uxCurrentEventBits, |
| const EventBits_t uxBitsToWaitFor, |
| const BaseType_t xWaitForAllBits ) PRIVILEGED_FUNCTION; |
| |
| /*-----------------------------------------------------------*/ |
| |
| #if ( configSUPPORT_STATIC_ALLOCATION == 1 ) |
| |
| EventGroupHandle_t xEventGroupCreateStatic( StaticEventGroup_t * pxEventGroupBuffer ) |
| { |
| EventGroup_t * pxEventBits; |
| |
| /* A StaticEventGroup_t object must be provided. */ |
| configASSERT( pxEventGroupBuffer ); |
| |
| #if ( configASSERT_DEFINED == 1 ) |
| { |
| /* Sanity check that the size of the structure used to declare a |
| * variable of type StaticEventGroup_t equals the size of the real |
| * event group structure. */ |
| volatile size_t xSize = sizeof( StaticEventGroup_t ); |
| configASSERT( xSize == sizeof( EventGroup_t ) ); |
| } /*lint !e529 xSize is referenced if configASSERT() is defined. */ |
| #endif /* configASSERT_DEFINED */ |
| |
| /* The user has provided a statically allocated event group - use it. */ |
| pxEventBits = ( EventGroup_t * ) pxEventGroupBuffer; /*lint !e740 !e9087 EventGroup_t and StaticEventGroup_t are deliberately aliased for data hiding purposes and guaranteed to have the same size and alignment requirement - checked by configASSERT(). */ |
| |
| if( pxEventBits != NULL ) |
| { |
| pxEventBits->uxEventBits = 0; |
| vListInitialise( &( pxEventBits->xTasksWaitingForBits ) ); |
| |
| #if ( configSUPPORT_DYNAMIC_ALLOCATION == 1 ) |
| { |
| /* Both static and dynamic allocation can be used, so note that |
| * this event group was created statically in case the event group |
| * is later deleted. */ |
| pxEventBits->ucStaticallyAllocated = pdTRUE; |
| } |
| #endif /* configSUPPORT_DYNAMIC_ALLOCATION */ |
| |
| traceEVENT_GROUP_CREATE( pxEventBits ); |
| } |
| else |
| { |
| /* xEventGroupCreateStatic should only ever be called with |
| * pxEventGroupBuffer pointing to a pre-allocated (compile time |
| * allocated) StaticEventGroup_t variable. */ |
| traceEVENT_GROUP_CREATE_FAILED(); |
| } |
| |
| return pxEventBits; |
| } |
| |
| #endif /* configSUPPORT_STATIC_ALLOCATION */ |
| /*-----------------------------------------------------------*/ |
| |
| #if ( configSUPPORT_DYNAMIC_ALLOCATION == 1 ) |
| |
| EventGroupHandle_t xEventGroupCreate( void ) |
| { |
| EventGroup_t * pxEventBits; |
| |
| /* Allocate the event group. Justification for MISRA deviation as |
| * follows: pvPortMalloc() always ensures returned memory blocks are |
| * aligned per the requirements of the MCU stack. In this case |
| * pvPortMalloc() must return a pointer that is guaranteed to meet the |
| * alignment requirements of the EventGroup_t structure - which (if you |
| * follow it through) is the alignment requirements of the TickType_t type |
| * (EventBits_t being of TickType_t itself). Therefore, whenever the |
| * stack alignment requirements are greater than or equal to the |
| * TickType_t alignment requirements the cast is safe. In other cases, |
| * where the natural word size of the architecture is less than |
| * sizeof( TickType_t ), the TickType_t variables will be accessed in two |
| * or more reads operations, and the alignment requirements is only that |
| * of each individual read. */ |
| pxEventBits = ( EventGroup_t * ) pvPortMalloc( sizeof( EventGroup_t ) ); /*lint !e9087 !e9079 see comment above. */ |
| |
| if( pxEventBits != NULL ) |
| { |
| pxEventBits->uxEventBits = 0; |
| vListInitialise( &( pxEventBits->xTasksWaitingForBits ) ); |
| |
| #if ( configSUPPORT_STATIC_ALLOCATION == 1 ) |
| { |
| /* Both static and dynamic allocation can be used, so note this |
| * event group was allocated statically in case the event group is |
| * later deleted. */ |
| pxEventBits->ucStaticallyAllocated = pdFALSE; |
| } |
| #endif /* configSUPPORT_STATIC_ALLOCATION */ |
| |
| traceEVENT_GROUP_CREATE( pxEventBits ); |
| } |
| else |
| { |
| traceEVENT_GROUP_CREATE_FAILED(); /*lint !e9063 Else branch only exists to allow tracing and does not generate code if trace macros are not defined. */ |
| } |
| |
| return pxEventBits; |
| } |
| |
| #endif /* configSUPPORT_DYNAMIC_ALLOCATION */ |
| /*-----------------------------------------------------------*/ |
| |
| EventBits_t xEventGroupSync( EventGroupHandle_t xEventGroup, |
| const EventBits_t uxBitsToSet, |
| const EventBits_t uxBitsToWaitFor, |
| TickType_t xTicksToWait ) |
| { |
| EventBits_t uxOriginalBitValue, uxReturn; |
| EventGroup_t * pxEventBits = xEventGroup; |
| BaseType_t xAlreadyYielded; |
| BaseType_t xTimeoutOccurred = pdFALSE; |
| |
| configASSERT( ( uxBitsToWaitFor & eventEVENT_BITS_CONTROL_BYTES ) == 0 ); |
| configASSERT( uxBitsToWaitFor != 0 ); |
| #if ( ( INCLUDE_xTaskGetSchedulerState == 1 ) || ( configUSE_TIMERS == 1 ) ) |
| { |
| configASSERT( !( ( xTaskGetSchedulerState() == taskSCHEDULER_SUSPENDED ) && ( xTicksToWait != 0 ) ) ); |
| } |
| #endif |
| |
| vTaskSuspendAll(); |
| { |
| uxOriginalBitValue = pxEventBits->uxEventBits; |
| |
| ( void ) xEventGroupSetBits( xEventGroup, uxBitsToSet ); |
| |
| if( ( ( uxOriginalBitValue | uxBitsToSet ) & uxBitsToWaitFor ) == uxBitsToWaitFor ) |
| { |
| /* All the rendezvous bits are now set - no need to block. */ |
| uxReturn = ( uxOriginalBitValue | uxBitsToSet ); |
| |
| /* Rendezvous always clear the bits. They will have been cleared |
| * already unless this is the only task in the rendezvous. */ |
| pxEventBits->uxEventBits &= ~uxBitsToWaitFor; |
| |
| xTicksToWait = 0; |
| } |
| else |
| { |
| if( xTicksToWait != ( TickType_t ) 0 ) |
| { |
| traceEVENT_GROUP_SYNC_BLOCK( xEventGroup, uxBitsToSet, uxBitsToWaitFor ); |
| |
| /* Store the bits that the calling task is waiting for in the |
| * task's event list item so the kernel knows when a match is |
| * found. Then enter the blocked state. */ |
| vTaskPlaceOnUnorderedEventList( &( pxEventBits->xTasksWaitingForBits ), ( uxBitsToWaitFor | eventCLEAR_EVENTS_ON_EXIT_BIT | eventWAIT_FOR_ALL_BITS ), xTicksToWait ); |
| |
| /* This assignment is obsolete as uxReturn will get set after |
| * the task unblocks, but some compilers mistakenly generate a |
| * warning about uxReturn being returned without being set if the |
| * assignment is omitted. */ |
| uxReturn = 0; |
| } |
| else |
| { |
| /* The rendezvous bits were not set, but no block time was |
| * specified - just return the current event bit value. */ |
| uxReturn = pxEventBits->uxEventBits; |
| xTimeoutOccurred = pdTRUE; |
| } |
| } |
| } |
| xAlreadyYielded = xTaskResumeAll(); |
| |
| if( xTicksToWait != ( TickType_t ) 0 ) |
| { |
| if( xAlreadyYielded == pdFALSE ) |
| { |
| portYIELD_WITHIN_API(); |
| } |
| else |
| { |
| mtCOVERAGE_TEST_MARKER(); |
| } |
| |
| /* The task blocked to wait for its required bits to be set - at this |
| * point either the required bits were set or the block time expired. If |
| * the required bits were set they will have been stored in the task's |
| * event list item, and they should now be retrieved then cleared. */ |
| uxReturn = uxTaskResetEventItemValue(); |
| |
| if( ( uxReturn & eventUNBLOCKED_DUE_TO_BIT_SET ) == ( EventBits_t ) 0 ) |
| { |
| /* The task timed out, just return the current event bit value. */ |
| taskENTER_CRITICAL(); |
| { |
| uxReturn = pxEventBits->uxEventBits; |
| |
| /* Although the task got here because it timed out before the |
| * bits it was waiting for were set, it is possible that since it |
| * unblocked another task has set the bits. If this is the case |
| * then it needs to clear the bits before exiting. */ |
| if( ( uxReturn & uxBitsToWaitFor ) == uxBitsToWaitFor ) |
| { |
| pxEventBits->uxEventBits &= ~uxBitsToWaitFor; |
| } |
| else |
| { |
| mtCOVERAGE_TEST_MARKER(); |
| } |
| } |
| taskEXIT_CRITICAL(); |
| |
| xTimeoutOccurred = pdTRUE; |
| } |
| else |
| { |
| /* The task unblocked because the bits were set. */ |
| } |
| |
| /* Control bits might be set as the task had blocked should not be |
| * returned. */ |
| uxReturn &= ~eventEVENT_BITS_CONTROL_BYTES; |
| } |
| |
| traceEVENT_GROUP_SYNC_END( xEventGroup, uxBitsToSet, uxBitsToWaitFor, xTimeoutOccurred ); |
| |
| /* Prevent compiler warnings when trace macros are not used. */ |
| ( void ) xTimeoutOccurred; |
| |
| return uxReturn; |
| } |
| /*-----------------------------------------------------------*/ |
| |
| EventBits_t xEventGroupWaitBits( EventGroupHandle_t xEventGroup, |
| const EventBits_t uxBitsToWaitFor, |
| const BaseType_t xClearOnExit, |
| const BaseType_t xWaitForAllBits, |
| TickType_t xTicksToWait ) |
| { |
| EventGroup_t * pxEventBits = xEventGroup; |
| EventBits_t uxReturn, uxControlBits = 0; |
| BaseType_t xWaitConditionMet, xAlreadyYielded; |
| BaseType_t xTimeoutOccurred = pdFALSE; |
| |
| /* Check the user is not attempting to wait on the bits used by the kernel |
| * itself, and that at least one bit is being requested. */ |
| configASSERT( xEventGroup ); |
| configASSERT( ( uxBitsToWaitFor & eventEVENT_BITS_CONTROL_BYTES ) == 0 ); |
| configASSERT( uxBitsToWaitFor != 0 ); |
| #if ( ( INCLUDE_xTaskGetSchedulerState == 1 ) || ( configUSE_TIMERS == 1 ) ) |
| { |
| configASSERT( !( ( xTaskGetSchedulerState() == taskSCHEDULER_SUSPENDED ) && ( xTicksToWait != 0 ) ) ); |
| } |
| #endif |
| |
| vTaskSuspendAll(); |
| { |
| const EventBits_t uxCurrentEventBits = pxEventBits->uxEventBits; |
| |
| /* Check to see if the wait condition is already met or not. */ |
| xWaitConditionMet = prvTestWaitCondition( uxCurrentEventBits, uxBitsToWaitFor, xWaitForAllBits ); |
| |
| if( xWaitConditionMet != pdFALSE ) |
| { |
| /* The wait condition has already been met so there is no need to |
| * block. */ |
| uxReturn = uxCurrentEventBits; |
| xTicksToWait = ( TickType_t ) 0; |
| |
| /* Clear the wait bits if requested to do so. */ |
| if( xClearOnExit != pdFALSE ) |
| { |
| pxEventBits->uxEventBits &= ~uxBitsToWaitFor; |
| } |
| else |
| { |
| mtCOVERAGE_TEST_MARKER(); |
| } |
| } |
| else if( xTicksToWait == ( TickType_t ) 0 ) |
| { |
| /* The wait condition has not been met, but no block time was |
| * specified, so just return the current value. */ |
| uxReturn = uxCurrentEventBits; |
| xTimeoutOccurred = pdTRUE; |
| } |
| else |
| { |
| /* The task is going to block to wait for its required bits to be |
| * set. uxControlBits are used to remember the specified behaviour of |
| * this call to xEventGroupWaitBits() - for use when the event bits |
| * unblock the task. */ |
| if( xClearOnExit != pdFALSE ) |
| { |
| uxControlBits |= eventCLEAR_EVENTS_ON_EXIT_BIT; |
| } |
| else |
| { |
| mtCOVERAGE_TEST_MARKER(); |
| } |
| |
| if( xWaitForAllBits != pdFALSE ) |
| { |
| uxControlBits |= eventWAIT_FOR_ALL_BITS; |
| } |
| else |
| { |
| mtCOVERAGE_TEST_MARKER(); |
| } |
| |
| /* Store the bits that the calling task is waiting for in the |
| * task's event list item so the kernel knows when a match is |
| * found. Then enter the blocked state. */ |
| vTaskPlaceOnUnorderedEventList( &( pxEventBits->xTasksWaitingForBits ), ( uxBitsToWaitFor | uxControlBits ), xTicksToWait ); |
| |
| /* This is obsolete as it will get set after the task unblocks, but |
| * some compilers mistakenly generate a warning about the variable |
| * being returned without being set if it is not done. */ |
| uxReturn = 0; |
| |
| traceEVENT_GROUP_WAIT_BITS_BLOCK( xEventGroup, uxBitsToWaitFor ); |
| } |
| } |
| xAlreadyYielded = xTaskResumeAll(); |
| |
| if( xTicksToWait != ( TickType_t ) 0 ) |
| { |
| if( xAlreadyYielded == pdFALSE ) |
| { |
| portYIELD_WITHIN_API(); |
| } |
| else |
| { |
| mtCOVERAGE_TEST_MARKER(); |
| } |
| |
| /* The task blocked to wait for its required bits to be set - at this |
| * point either the required bits were set or the block time expired. If |
| * the required bits were set they will have been stored in the task's |
| * event list item, and they should now be retrieved then cleared. */ |
| uxReturn = uxTaskResetEventItemValue(); |
| |
| if( ( uxReturn & eventUNBLOCKED_DUE_TO_BIT_SET ) == ( EventBits_t ) 0 ) |
| { |
| taskENTER_CRITICAL(); |
| { |
| /* The task timed out, just return the current event bit value. */ |
| uxReturn = pxEventBits->uxEventBits; |
| |
| /* It is possible that the event bits were updated between this |
| * task leaving the Blocked state and running again. */ |
| if( prvTestWaitCondition( uxReturn, uxBitsToWaitFor, xWaitForAllBits ) != pdFALSE ) |
| { |
| if( xClearOnExit != pdFALSE ) |
| { |
| pxEventBits->uxEventBits &= ~uxBitsToWaitFor; |
| } |
| else |
| { |
| mtCOVERAGE_TEST_MARKER(); |
| } |
| } |
| else |
| { |
| mtCOVERAGE_TEST_MARKER(); |
| } |
| |
| xTimeoutOccurred = pdTRUE; |
| } |
| taskEXIT_CRITICAL(); |
| } |
| else |
| { |
| /* The task unblocked because the bits were set. */ |
| } |
| |
| /* The task blocked so control bits may have been set. */ |
| uxReturn &= ~eventEVENT_BITS_CONTROL_BYTES; |
| } |
| |
| traceEVENT_GROUP_WAIT_BITS_END( xEventGroup, uxBitsToWaitFor, xTimeoutOccurred ); |
| |
| /* Prevent compiler warnings when trace macros are not used. */ |
| ( void ) xTimeoutOccurred; |
| |
| return uxReturn; |
| } |
| /*-----------------------------------------------------------*/ |
| |
| EventBits_t xEventGroupClearBits( EventGroupHandle_t xEventGroup, |
| const EventBits_t uxBitsToClear ) |
| { |
| EventGroup_t * pxEventBits = xEventGroup; |
| EventBits_t uxReturn; |
| |
| /* Check the user is not attempting to clear the bits used by the kernel |
| * itself. */ |
| configASSERT( xEventGroup ); |
| configASSERT( ( uxBitsToClear & eventEVENT_BITS_CONTROL_BYTES ) == 0 ); |
| |
| taskENTER_CRITICAL(); |
| { |
| traceEVENT_GROUP_CLEAR_BITS( xEventGroup, uxBitsToClear ); |
| |
| /* The value returned is the event group value prior to the bits being |
| * cleared. */ |
| uxReturn = pxEventBits->uxEventBits; |
| |
| /* Clear the bits. */ |
| pxEventBits->uxEventBits &= ~uxBitsToClear; |
| } |
| taskEXIT_CRITICAL(); |
| |
| return uxReturn; |
| } |
| /*-----------------------------------------------------------*/ |
| |
| #if ( ( configUSE_TRACE_FACILITY == 1 ) && ( INCLUDE_xTimerPendFunctionCall == 1 ) && ( configUSE_TIMERS == 1 ) ) |
| |
| BaseType_t xEventGroupClearBitsFromISR( EventGroupHandle_t xEventGroup, |
| const EventBits_t uxBitsToClear ) |
| { |
| BaseType_t xReturn; |
| |
| traceEVENT_GROUP_CLEAR_BITS_FROM_ISR( xEventGroup, uxBitsToClear ); |
| xReturn = xTimerPendFunctionCallFromISR( vEventGroupClearBitsCallback, ( void * ) xEventGroup, ( uint32_t ) uxBitsToClear, NULL ); /*lint !e9087 Can't avoid cast to void* as a generic callback function not specific to this use case. Callback casts back to original type so safe. */ |
| |
| return xReturn; |
| } |
| |
| #endif /* if ( ( configUSE_TRACE_FACILITY == 1 ) && ( INCLUDE_xTimerPendFunctionCall == 1 ) && ( configUSE_TIMERS == 1 ) ) */ |
| /*-----------------------------------------------------------*/ |
| |
| EventBits_t xEventGroupGetBitsFromISR( EventGroupHandle_t xEventGroup ) |
| { |
| portBASE_TYPE xSavedInterruptStatus; |
| EventGroup_t const * const pxEventBits = xEventGroup; |
| EventBits_t uxReturn; |
| |
| xSavedInterruptStatus = portSET_INTERRUPT_MASK_FROM_ISR(); |
| { |
| uxReturn = pxEventBits->uxEventBits; |
| } |
| portCLEAR_INTERRUPT_MASK_FROM_ISR( xSavedInterruptStatus ); |
| |
| return uxReturn; |
| } /*lint !e818 EventGroupHandle_t is a typedef used in other functions to so can't be pointer to const. */ |
| /*-----------------------------------------------------------*/ |
| |
| EventBits_t xEventGroupSetBits( EventGroupHandle_t xEventGroup, |
| const EventBits_t uxBitsToSet ) |
| { |
| ListItem_t * pxListItem; |
| ListItem_t * pxNext; |
| ListItem_t const * pxListEnd; |
| List_t const * pxList; |
| EventBits_t uxBitsToClear = 0, uxBitsWaitedFor, uxControlBits; |
| EventGroup_t * pxEventBits = xEventGroup; |
| BaseType_t xMatchFound = pdFALSE; |
| |
| /* Check the user is not attempting to set the bits used by the kernel |
| * itself. */ |
| configASSERT( xEventGroup ); |
| configASSERT( ( uxBitsToSet & eventEVENT_BITS_CONTROL_BYTES ) == 0 ); |
| |
| pxList = &( pxEventBits->xTasksWaitingForBits ); |
| pxListEnd = listGET_END_MARKER( pxList ); /*lint !e826 !e740 !e9087 The mini list structure is used as the list end to save RAM. This is checked and valid. */ |
| vTaskSuspendAll(); |
| { |
| traceEVENT_GROUP_SET_BITS( xEventGroup, uxBitsToSet ); |
| |
| pxListItem = listGET_HEAD_ENTRY( pxList ); |
| |
| /* Set the bits. */ |
| pxEventBits->uxEventBits |= uxBitsToSet; |
| |
| /* See if the new bit value should unblock any tasks. */ |
| while( pxListItem != pxListEnd ) |
| { |
| pxNext = listGET_NEXT( pxListItem ); |
| uxBitsWaitedFor = listGET_LIST_ITEM_VALUE( pxListItem ); |
| xMatchFound = pdFALSE; |
| |
| /* Split the bits waited for from the control bits. */ |
| uxControlBits = uxBitsWaitedFor & eventEVENT_BITS_CONTROL_BYTES; |
| uxBitsWaitedFor &= ~eventEVENT_BITS_CONTROL_BYTES; |
| |
| if( ( uxControlBits & eventWAIT_FOR_ALL_BITS ) == ( EventBits_t ) 0 ) |
| { |
| /* Just looking for single bit being set. */ |
| if( ( uxBitsWaitedFor & pxEventBits->uxEventBits ) != ( EventBits_t ) 0 ) |
| { |
| xMatchFound = pdTRUE; |
| } |
| else |
| { |
| mtCOVERAGE_TEST_MARKER(); |
| } |
| } |
| else if( ( uxBitsWaitedFor & pxEventBits->uxEventBits ) == uxBitsWaitedFor ) |
| { |
| /* All bits are set. */ |
| xMatchFound = pdTRUE; |
| } |
| else |
| { |
| /* Need all bits to be set, but not all the bits were set. */ |
| } |
| |
| if( xMatchFound != pdFALSE ) |
| { |
| /* The bits match. Should the bits be cleared on exit? */ |
| if( ( uxControlBits & eventCLEAR_EVENTS_ON_EXIT_BIT ) != ( EventBits_t ) 0 ) |
| { |
| uxBitsToClear |= uxBitsWaitedFor; |
| } |
| else |
| { |
| mtCOVERAGE_TEST_MARKER(); |
| } |
| |
| /* Store the actual event flag value in the task's event list |
| * item before removing the task from the event list. The |
| * eventUNBLOCKED_DUE_TO_BIT_SET bit is set so the task knows |
| * that is was unblocked due to its required bits matching, rather |
| * than because it timed out. */ |
| vTaskRemoveFromUnorderedEventList( pxListItem, pxEventBits->uxEventBits | eventUNBLOCKED_DUE_TO_BIT_SET ); |
| } |
| |
| /* Move onto the next list item. Note pxListItem->pxNext is not |
| * used here as the list item may have been removed from the event list |
| * and inserted into the ready/pending reading list. */ |
| pxListItem = pxNext; |
| } |
| |
| /* Clear any bits that matched when the eventCLEAR_EVENTS_ON_EXIT_BIT |
| * bit was set in the control word. */ |
| pxEventBits->uxEventBits &= ~uxBitsToClear; |
| } |
| ( void ) xTaskResumeAll(); |
| |
| return pxEventBits->uxEventBits; |
| } |
| /*-----------------------------------------------------------*/ |
| |
| void vEventGroupDelete( EventGroupHandle_t xEventGroup ) |
| { |
| EventGroup_t * pxEventBits = xEventGroup; |
| const List_t * pxTasksWaitingForBits; |
| |
| configASSERT( pxEventBits ); |
| |
| pxTasksWaitingForBits = &( pxEventBits->xTasksWaitingForBits ); |
| |
| vTaskSuspendAll(); |
| { |
| traceEVENT_GROUP_DELETE( xEventGroup ); |
| |
| while( listCURRENT_LIST_LENGTH( pxTasksWaitingForBits ) > ( UBaseType_t ) 0 ) |
| { |
| /* Unblock the task, returning 0 as the event list is being deleted |
| * and cannot therefore have any bits set. */ |
| configASSERT( pxTasksWaitingForBits->xListEnd.pxNext != ( const ListItem_t * ) &( pxTasksWaitingForBits->xListEnd ) ); |
| vTaskRemoveFromUnorderedEventList( pxTasksWaitingForBits->xListEnd.pxNext, eventUNBLOCKED_DUE_TO_BIT_SET ); |
| } |
| } |
| ( void ) xTaskResumeAll(); |
| |
| #if ( ( configSUPPORT_DYNAMIC_ALLOCATION == 1 ) && ( configSUPPORT_STATIC_ALLOCATION == 0 ) ) |
| { |
| /* The event group can only have been allocated dynamically - free |
| * it again. */ |
| vPortFree( pxEventBits ); |
| } |
| #elif ( ( configSUPPORT_DYNAMIC_ALLOCATION == 1 ) && ( configSUPPORT_STATIC_ALLOCATION == 1 ) ) |
| { |
| /* The event group could have been allocated statically or |
| * dynamically, so check before attempting to free the memory. */ |
| if( pxEventBits->ucStaticallyAllocated == ( uint8_t ) pdFALSE ) |
| { |
| vPortFree( pxEventBits ); |
| } |
| else |
| { |
| mtCOVERAGE_TEST_MARKER(); |
| } |
| } |
| #endif /* configSUPPORT_DYNAMIC_ALLOCATION */ |
| } |
| /*-----------------------------------------------------------*/ |
| |
| #if ( configSUPPORT_STATIC_ALLOCATION == 1 ) |
| BaseType_t xEventGroupGetStaticBuffer( EventGroupHandle_t xEventGroup, |
| StaticEventGroup_t ** ppxEventGroupBuffer ) |
| { |
| BaseType_t xReturn; |
| EventGroup_t * pxEventBits = xEventGroup; |
| |
| configASSERT( pxEventBits ); |
| configASSERT( ppxEventGroupBuffer ); |
| |
| #if ( configSUPPORT_DYNAMIC_ALLOCATION == 1 ) |
| { |
| /* Check if the event group was statically allocated. */ |
| if( pxEventBits->ucStaticallyAllocated == ( uint8_t ) pdTRUE ) |
| { |
| *ppxEventGroupBuffer = ( StaticEventGroup_t * ) pxEventBits; |
| xReturn = pdTRUE; |
| } |
| else |
| { |
| xReturn = pdFALSE; |
| } |
| } |
| #else /* configSUPPORT_DYNAMIC_ALLOCATION */ |
| { |
| /* Event group must have been statically allocated. */ |
| *ppxEventGroupBuffer = ( StaticEventGroup_t * ) pxEventBits; |
| xReturn = pdTRUE; |
| } |
| #endif /* configSUPPORT_DYNAMIC_ALLOCATION */ |
| |
| return xReturn; |
| } |
| #endif /* configSUPPORT_STATIC_ALLOCATION */ |
| /*-----------------------------------------------------------*/ |
| |
| /* For internal use only - execute a 'set bits' command that was pended from |
| * an interrupt. */ |
| void vEventGroupSetBitsCallback( void * pvEventGroup, |
| const uint32_t ulBitsToSet ) |
| { |
| ( void ) xEventGroupSetBits( pvEventGroup, ( EventBits_t ) ulBitsToSet ); /*lint !e9079 Can't avoid cast to void* as a generic timer callback prototype. Callback casts back to original type so safe. */ |
| } |
| /*-----------------------------------------------------------*/ |
| |
| /* For internal use only - execute a 'clear bits' command that was pended from |
| * an interrupt. */ |
| void vEventGroupClearBitsCallback( void * pvEventGroup, |
| const uint32_t ulBitsToClear ) |
| { |
| ( void ) xEventGroupClearBits( pvEventGroup, ( EventBits_t ) ulBitsToClear ); /*lint !e9079 Can't avoid cast to void* as a generic timer callback prototype. Callback casts back to original type so safe. */ |
| } |
| /*-----------------------------------------------------------*/ |
| |
| static BaseType_t prvTestWaitCondition( const EventBits_t uxCurrentEventBits, |
| const EventBits_t uxBitsToWaitFor, |
| const BaseType_t xWaitForAllBits ) |
| { |
| BaseType_t xWaitConditionMet = pdFALSE; |
| |
| if( xWaitForAllBits == pdFALSE ) |
| { |
| /* Task only has to wait for one bit within uxBitsToWaitFor to be |
| * set. Is one already set? */ |
| if( ( uxCurrentEventBits & uxBitsToWaitFor ) != ( EventBits_t ) 0 ) |
| { |
| xWaitConditionMet = pdTRUE; |
| } |
| else |
| { |
| mtCOVERAGE_TEST_MARKER(); |
| } |
| } |
| else |
| { |
| /* Task has to wait for all the bits in uxBitsToWaitFor to be set. |
| * Are they set already? */ |
| if( ( uxCurrentEventBits & uxBitsToWaitFor ) == uxBitsToWaitFor ) |
| { |
| xWaitConditionMet = pdTRUE; |
| } |
| else |
| { |
| mtCOVERAGE_TEST_MARKER(); |
| } |
| } |
| |
| return xWaitConditionMet; |
| } |
| /*-----------------------------------------------------------*/ |
| |
| #if ( ( configUSE_TRACE_FACILITY == 1 ) && ( INCLUDE_xTimerPendFunctionCall == 1 ) && ( configUSE_TIMERS == 1 ) ) |
| |
| BaseType_t xEventGroupSetBitsFromISR( EventGroupHandle_t xEventGroup, |
| const EventBits_t uxBitsToSet, |
| BaseType_t * pxHigherPriorityTaskWoken ) |
| { |
| BaseType_t xReturn; |
| |
| traceEVENT_GROUP_SET_BITS_FROM_ISR( xEventGroup, uxBitsToSet ); |
| xReturn = xTimerPendFunctionCallFromISR( vEventGroupSetBitsCallback, ( void * ) xEventGroup, ( uint32_t ) uxBitsToSet, pxHigherPriorityTaskWoken ); /*lint !e9087 Can't avoid cast to void* as a generic callback function not specific to this use case. Callback casts back to original type so safe. */ |
| |
| return xReturn; |
| } |
| |
| #endif /* if ( ( configUSE_TRACE_FACILITY == 1 ) && ( INCLUDE_xTimerPendFunctionCall == 1 ) && ( configUSE_TIMERS == 1 ) ) */ |
| /*-----------------------------------------------------------*/ |
| |
| #if ( configUSE_TRACE_FACILITY == 1 ) |
| |
| UBaseType_t uxEventGroupGetNumber( void * xEventGroup ) |
| { |
| UBaseType_t xReturn; |
| EventGroup_t const * pxEventBits = ( EventGroup_t * ) xEventGroup; /*lint !e9087 !e9079 EventGroupHandle_t is a pointer to an EventGroup_t, but EventGroupHandle_t is kept opaque outside of this file for data hiding purposes. */ |
| |
| if( xEventGroup == NULL ) |
| { |
| xReturn = 0; |
| } |
| else |
| { |
| xReturn = pxEventBits->uxEventGroupNumber; |
| } |
| |
| return xReturn; |
| } |
| |
| #endif /* configUSE_TRACE_FACILITY */ |
| /*-----------------------------------------------------------*/ |
| |
| #if ( configUSE_TRACE_FACILITY == 1 ) |
| |
| void vEventGroupSetNumber( void * xEventGroup, |
| UBaseType_t uxEventGroupNumber ) |
| { |
| ( ( EventGroup_t * ) xEventGroup )->uxEventGroupNumber = uxEventGroupNumber; /*lint !e9087 !e9079 EventGroupHandle_t is a pointer to an EventGroup_t, but EventGroupHandle_t is kept opaque outside of this file for data hiding purposes. */ |
| } |
| |
| #endif /* configUSE_TRACE_FACILITY */ |
| /*-----------------------------------------------------------*/ |
