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Merge branch 'bugfix/freertos_event_list_removal' into 'master'

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FreeRTOS: Fix and optimize event list removal functions

Closes IDFGH-10652

See merge request espressif/esp-idf!25157
This commit is contained in:
Darian 2023-08-16 12:22:45 +08:00
commit c1cbd9a788
1 changed files with 78 additions and 69 deletions
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147
components/freertos/FreeRTOS-Kernel/tasks.c
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@ -294,8 +294,8 @@
*/
#if ( configNUM_CORES > 1 )
#define taskCAN_BE_SCHEDULED( pxTCB ) \
( ( pxTCB->xCoreID != tskNO_AFFINITY ) ) ? ( uxSchedulerSuspended[ pxTCB->xCoreID ] == ( UBaseType_t ) 0U ) : \
( ( uxSchedulerSuspended[ 0 ] == ( UBaseType_t ) 0U ) || ( uxSchedulerSuspended[ 1 ] == ( UBaseType_t ) 0U ) )
( ( ( pxTCB->xCoreID != tskNO_AFFINITY ) ) ? ( uxSchedulerSuspended[ pxTCB->xCoreID ] == ( UBaseType_t ) 0U ) : \
( ( uxSchedulerSuspended[ 0 ] == ( UBaseType_t ) 0U ) || ( uxSchedulerSuspended[ 1 ] == ( UBaseType_t ) 0U ) ) )
#else
#define taskCAN_BE_SCHEDULED( pxTCB ) ( ( uxSchedulerSuspended[ 0 ] == ( UBaseType_t ) 0U ) )
#endif /* configNUM_CORES > 1 */
@ -3932,23 +3932,31 @@ BaseType_t xTaskRemoveFromEventList( const List_t * const pxEventList )
}
#endif /* configNUM_CORES > 1 */
{
/* Before taking the kernel lock, another task/ISR could have already
* emptied the pxEventList. So we insert a check here to see if
* pxEventList is empty before attempting to remove an item from it. */
if( listLIST_IS_EMPTY( pxEventList ) == pdFALSE )
/* The event list is sorted in priority order, so the first in the list can
* be removed as it is known to be the highest priority. Remove the TCB from
* the delayed list, and add it to the ready list. */
#if ( configNUM_CORES > 1 )
/* Before taking the kernel lock, another task/ISR could have already
* emptied the pxEventList. So we insert a check here to see if
* pxEventList is empty before attempting to remove an item from it. */
if( listLIST_IS_EMPTY( pxEventList ) == pdTRUE )
{
/* The pxEventList was emptied before we entered the critical section,
* Nothing to do except return pdFALSE. */
xReturn = pdFALSE;
}
else
#else /* configNUM_CORES > 1 */
/* If an event is for a queue that is locked then this function will never
* get called - the lock count on the queue will get modified instead. This
* means exclusive access to the event list is guaranteed here.
*
* This function assumes that a check has already been made to ensure that
* pxEventList is not empty. */
#endif /* configNUM_CORES > 1 */
{
BaseType_t xCurCoreID = xPortGetCoreID();
/* The event list is sorted in priority order, so the first in the list can
* be removed as it is known to be the highest priority. Remove the TCB from
* the delayed list, and add it to the ready list.
*
* If an event is for a queue that is locked then this function will never
* get called - the lock count on the queue will get modified instead. This
* means exclusive access to the event list is guaranteed here.
*
* This function assumes that a check has already been made to ensure that
* pxEventList is not empty. */
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. */
configASSERT( pxUnblockedTCB );
( void ) uxListRemove( &( pxUnblockedTCB->xEventListItem ) );
@ -4013,12 +4021,6 @@ BaseType_t xTaskRemoveFromEventList( const List_t * const pxEventList )
xReturn = pdFALSE;
}
}
else
{
/* The pxEventList was emptied before we entered the critical section,
* Nothing to do except return pdFALSE. */
xReturn = pdFALSE;
}
}
#if ( configNUM_CORES > 1 )
/* Release the previously taken kernel lock. */
@ -4077,57 +4079,64 @@ void vTaskRemoveFromUnorderedEventList( ListItem_t * pxEventListItem,
configASSERT( pxUnblockedTCB );
( void ) uxListRemove( pxEventListItem );
/* Add the task to the ready list if a core with compatible affinity
* has NOT suspended its scheduler. This occurs when:
* - The task is pinned, and the pinned core's scheduler is running
* - The task is unpinned, and at least one of the core's scheduler is running */
if( taskCAN_BE_SCHEDULED( pxUnblockedTCB ) )
#if ( configUSE_TICKLESS_IDLE != 0 )
{
/* If a task is blocked on a kernel object then xNextTaskUnblockTime
* might be set to the blocked task's time out time. If the task is
* unblocked for a reason other than a timeout xNextTaskUnblockTime is
* normally left unchanged, because it is automatically reset to a new
* value when the tick count equals xNextTaskUnblockTime. However if
* tickless idling is used it might be more important to enter sleep mode
* at the earliest possible time - so reset xNextTaskUnblockTime here to
* ensure it is updated at the earliest possible time. */
prvResetNextTaskUnblockTime();
}
#endif
#if ( configNUM_CORES > 1 )
/* Add the task to the ready list if a core with compatible affinity
* has NOT suspended its scheduler. This occurs when:
* - The task is pinned, and the pinned core's scheduler is running
* - The task is unpinned, and at least one of the core's scheduler is
* running */
if( !taskCAN_BE_SCHEDULED( pxUnblockedTCB ) )
{
/* We arrive here due to one of the following possibilities:
* - The task is pinned to core X and core X has suspended its scheduler
* - The task is unpinned and both cores have suspend their schedulers
* Therefore, we add the task to one of the pending lists:
* - If the task is pinned to core X, add it to core X's pending list
* - If the task is unpinned, add it to the current core's pending list */
BaseType_t xPendingListCore = ( ( pxUnblockedTCB->xCoreID == tskNO_AFFINITY ) ? xCurCoreID : pxUnblockedTCB->xCoreID );
configASSERT( uxSchedulerSuspended[ xPendingListCore ] != ( UBaseType_t ) 0U );
/* The delayed and ready lists cannot be accessed, so hold this task
* pending until the scheduler is resumed. */
vListInsertEnd( &( xPendingReadyList[ xPendingListCore ] ), &( pxUnblockedTCB->xEventListItem ) );
}
else
#else /* configNUM_CORES > 1 */
/* In single core, the caller of this function has already suspended the
* scheduler, which means we have exclusive access to the ready list.
* We add the unblocked task to the ready list directly. */
#endif /* configNUM_CORES > 1 */
{
/* Remove the task from the delayed list and add it to the ready list. The
* scheduler is suspended so interrupts will not be accessing the ready
* lists. */
( void ) uxListRemove( &( pxUnblockedTCB->xStateListItem ) );
prvAddTaskToReadyList( pxUnblockedTCB );
#if ( configUSE_TICKLESS_IDLE != 0 )
{
/* If a task is blocked on a kernel object then xNextTaskUnblockTime
* might be set to the blocked task's time out time. If the task is
* unblocked for a reason other than a timeout xNextTaskUnblockTime is
* normally left unchanged, because it is automatically reset to a new
* value when the tick count equals xNextTaskUnblockTime. However if
* tickless idling is used it might be more important to enter sleep mode
* at the earliest possible time - so reset xNextTaskUnblockTime here to
* ensure it is updated at the earliest possible time. */
prvResetNextTaskUnblockTime();
}
#endif
}
else
{
/* We arrive here due to one of the following possibilities:
* - The task is pinned to core X and core X has suspended its scheduler
* - The task is unpinned and both cores have suspend their schedulers
* Therefore, we add the task to one of the pending lists:
* - If the task is pinned to core X, add it to core X's pending list
* - If the task is unpinned, add it to the current core's pending list */
BaseType_t xPendingListCore;
#if ( configNUM_CORES > 1 )
xPendingListCore = ( ( pxUnblockedTCB->xCoreID == tskNO_AFFINITY ) ? xCurCoreID : pxUnblockedTCB->xCoreID );
#else
xPendingListCore = 0;
#endif /* configNUM_CORES > 1 */
configASSERT( uxSchedulerSuspended[ xPendingListCore ] != ( UBaseType_t ) 0U );
/* The delayed and ready lists cannot be accessed, so hold this task
* pending until the scheduler is resumed. */
vListInsertEnd( &( xPendingReadyList[ xPendingListCore ] ), &( pxUnblockedTCB->xEventListItem ) );
}
if( prvCheckForYield( pxUnblockedTCB, xCurCoreID, pdFALSE ) )
{
/* The unblocked task has a priority above that of the calling task, so
* a context switch is required. This function is called with the
* scheduler suspended so xYieldPending is set so the context switch
* occurs immediately that the scheduler is resumed (unsuspended). */
xYieldPending[ xCurCoreID ] = pdTRUE;
if( prvCheckForYield( pxUnblockedTCB, xCurCoreID, pdFALSE ) )
{
/* The unblocked task has a priority above that of the calling task, so
* a context switch is required. This function is called with the
* scheduler suspended so xYieldPending is set so the context switch
* occurs immediately that the scheduler is resumed (unsuspended). */
xYieldPending[ xCurCoreID ] = pdTRUE;
}
}
}
/*-----------------------------------------------------------*/