len0rd/FreeRTOS-Kernel
1
0
Fork 0
mirror of https://github.com/FreeRTOS/FreeRTOS-Kernel.git synced 2025-10-19 11:17:43 -04:00
Code Issues Projects Releases Packages Wiki Activity

Enhanced priority dis-inheritance functionality in the case where a task that caused another task to inherit its priority times out before obtain a mutex.

Browse source 
Added test code to GenQTest to test the new priority dis-inheritance functionality.
Allow the default names given to the Idle and Timer tasks to be overwridden by definitions in FreeRTOSConfig.h.
This commit is contained in:
Richard Barry 2017-01-16 03:58:51 +00:00
parent 883541bc8e
commit d67dcf9c74
7 changed files with 521 additions and 52 deletions
Download patch file Download diff file Expand all files Collapse all files

181
FreeRTOS/Source/tasks.c
View file

@ -164,6 +164,12 @@ set then don't fill the stack so there is no unnecessary dependency on memset. *
#define static
#endif
/* The name allocated to the Idle task. This can be overridden by defining
tskIDLE_TASK_NAME in FreeRTOSConfig.h. */
#ifndef tskIDLE_TASK_NAME
#define tskIDLE_TASK_NAME "IDLE"
#endif
#if ( configUSE_PORT_OPTIMISED_TASK_SELECTION == 0 )
/* If configUSE_PORT_OPTIMISED_TASK_SELECTION is 0 then task selection is
@ -713,7 +719,7 @@ static void prvAddNewTaskToReadyList( TCB_t *pxNewTCB ) PRIVILEGED_FUNCTION;
#endif /* ( portUSING_MPU_WRAPPERS == 1 ) && ( configSUPPORT_STATIC_ALLOCATION == 1 ) */
/*-----------------------------------------------------------*/
#if( ( portUSING_MPU_WRAPPERS == 1 ) && ( configSUPPORT_DYNAMIC_ALLOCATION == 1 ) )
#if( ( portUSING_MPU_WRAPPERS == 1 ) && ( tskSTATIC_AND_DYNAMIC_ALLOCATION_POSSIBLE != 0 ) )
BaseType_t xTaskCreateRestricted( const TaskParameters_t * const pxTaskDefinition, TaskHandle_t *pxCreatedTask )
{
@ -1610,14 +1616,14 @@ static void prvAddNewTaskToReadyList( TCB_t *pxNewTCB )
}
/* If the task is in the blocked or suspended list we need do
nothing more than change it's priority variable. However, if
nothing more than change its priority variable. However, if
the task is in a ready list it needs to be removed and placed
in the list appropriate to its new priority. */
if( listIS_CONTAINED_WITHIN( &( pxReadyTasksLists[ uxPriorityUsedOnEntry ] ), &( pxTCB->xStateListItem ) ) != pdFALSE )
{
/* The task is currently in its ready list - remove before adding
it to it's new ready list. As we are in a critical section we
can do this even if the scheduler is suspended. */
/* The task is currently in its ready list - remove before
adding it to it's new ready list. As we are in a critical
section we can do this even if the scheduler is suspended. */
if( uxListRemove( &( pxTCB->xStateListItem ) ) == ( UBaseType_t ) 0 )
{
/* It is known that the task is in its ready list so
@ -1944,7 +1950,7 @@ BaseType_t xReturn;
address of the RAM then create the idle task. */
vApplicationGetIdleTaskMemory( &pxIdleTaskTCBBuffer, &pxIdleTaskStackBuffer, &ulIdleTaskStackSize );
xIdleTaskHandle = xTaskCreateStatic( prvIdleTask,
"IDLE",
tskIDLE_TASK_NAME,
ulIdleTaskStackSize,
( void * ) NULL, /*lint !e961. The cast is not redundant for all compilers. */
( tskIDLE_PRIORITY | portPRIVILEGE_BIT ),
@ -1964,7 +1970,8 @@ BaseType_t xReturn;
{
/* The Idle task is being created using dynamically allocated RAM. */
xReturn = xTaskCreate( prvIdleTask,
"IDLE", configMINIMAL_STACK_SIZE,
tskIDLE_TASK_NAME,
configMINIMAL_STACK_SIZE,
( void * ) NULL,
( tskIDLE_PRIORITY | portPRIVILEGE_BIT ),
&xIdleTaskHandle ); /*lint !e961 MISRA exception, justified as it is not a redundant explicit cast to all supported compilers. */
@ -2545,7 +2552,7 @@ implementations require configUSE_TICKLESS_IDLE to be set to a value other than
BaseType_t xTaskAbortDelay( TaskHandle_t xTask )
{
TCB_t *pxTCB = ( TCB_t * ) xTask;
BaseType_t xReturn = pdFALSE;
BaseType_t xReturn;
configASSERT( pxTCB );
@ -2555,6 +2562,8 @@ implementations require configUSE_TICKLESS_IDLE to be set to a value other than
it is actually in the Blocked state. */
if( eTaskGetState( xTask ) == eBlocked )
{
xReturn = pdPASS;
/* Remove the reference to the task from the blocked list. An
interrupt won't touch the xStateListItem because the
scheduler is suspended. */
@ -2603,7 +2612,7 @@ implementations require configUSE_TICKLESS_IDLE to be set to a value other than
}
else
{
mtCOVERAGE_TEST_MARKER();
xReturn = pdFAIL;
}
}
( void ) xTaskResumeAll();
@ -3130,6 +3139,7 @@ BaseType_t xReturn;
{
/* Minor optimisation. The tick count cannot change in this block. */
const TickType_t xConstTickCount = xTickCount;
const TickType_t xElapsedTime = xConstTickCount - pxTimeOut->xTimeOnEntering;
#if( INCLUDE_xTaskAbortDelay == 1 )
if( pxCurrentTCB->ucDelayAborted != pdFALSE )
@ -3162,10 +3172,10 @@ BaseType_t xReturn;
was called. */
xReturn = pdTRUE;
}
else if( ( ( TickType_t ) ( xConstTickCount - pxTimeOut->xTimeOnEntering ) ) < *pxTicksToWait ) /*lint !e961 Explicit casting is only redundant with some compilers, whereas others require it to prevent integer conversion errors. */
else if( xElapsedTime < *pxTicksToWait ) /*lint !e961 Explicit casting is only redundant with some compilers, whereas others require it to prevent integer conversion errors. */
{
/* Not a genuine timeout. Adjust parameters for time remaining. */
*pxTicksToWait -= ( xConstTickCount - pxTimeOut->xTimeOnEntering );
*pxTicksToWait -= xElapsedTime;
vTaskSetTimeOutState( pxTimeOut );
xReturn = pdFALSE;
}
@ -3817,25 +3827,25 @@ TCB_t *pxTCB;
BaseType_t xTaskPriorityInherit( TaskHandle_t const pxMutexHolder )
{
TCB_t * const pxTCB = ( TCB_t * ) pxMutexHolder;
TCB_t * const pxMutexHolderTCB = ( TCB_t * ) pxMutexHolder;
BaseType_t xReturn = pdFALSE;
/* If the mutex was given back by an interrupt while the queue was
locked then the mutex holder might now be NULL. _RB_ Is this still
needed as interrupt can no longer use mutexes? */
needed as interrupts can no longer use mutexes? */
if( pxMutexHolder != NULL )
{
/* If the holder of the mutex has a priority below the priority of
the task attempting to obtain the mutex then it will temporarily
inherit the priority of the task attempting to obtain the mutex. */
if( pxTCB->uxPriority < pxCurrentTCB->uxPriority )
if( pxMutexHolderTCB->uxPriority < pxCurrentTCB->uxPriority )
{
/* Adjust the mutex holder state to account for its new
priority. Only reset the event list item value if the value is
not being used for anything else. */
if( ( listGET_LIST_ITEM_VALUE( &( pxTCB->xEventListItem ) ) & taskEVENT_LIST_ITEM_VALUE_IN_USE ) == 0UL )
not being used for anything else. */
if( ( listGET_LIST_ITEM_VALUE( &( pxMutexHolderTCB->xEventListItem ) ) & taskEVENT_LIST_ITEM_VALUE_IN_USE ) == 0UL )
{
listSET_LIST_ITEM_VALUE( &( pxTCB->xEventListItem ), ( TickType_t ) configMAX_PRIORITIES - ( TickType_t ) pxCurrentTCB->uxPriority ); /*lint !e961 MISRA exception as the casts are only redundant for some ports. */
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. */
}
else
{
@ -3844,11 +3854,11 @@ TCB_t *pxTCB;
/* If the task being modified is in the ready state it will need
to be moved into a new list. */
if( listIS_CONTAINED_WITHIN( &( pxReadyTasksLists[ pxTCB->uxPriority ] ), &( pxTCB->xStateListItem ) ) != pdFALSE )
if( listIS_CONTAINED_WITHIN( &( pxReadyTasksLists[ pxMutexHolderTCB->uxPriority ] ), &( pxMutexHolderTCB->xStateListItem ) ) != pdFALSE )
{
if( uxListRemove( &( pxTCB->xStateListItem ) ) == ( UBaseType_t ) 0 )
if( uxListRemove( &( pxMutexHolderTCB->xStateListItem ) ) == ( UBaseType_t ) 0 )
{
taskRESET_READY_PRIORITY( pxTCB->uxPriority );
taskRESET_READY_PRIORITY( pxMutexHolderTCB->uxPriority );
}
else
{
@ -3856,23 +3866,37 @@ TCB_t *pxTCB;
}
/* Inherit the priority before being moved into the new list. */
pxTCB->uxPriority = pxCurrentTCB->uxPriority;
prvAddTaskToReadyList( pxTCB );
pxMutexHolderTCB->uxPriority = pxCurrentTCB->uxPriority;
prvAddTaskToReadyList( pxMutexHolderTCB );
}
else
{
/* Just inherit the priority. */
pxTCB->uxPriority = pxCurrentTCB->uxPriority;
pxMutexHolderTCB->uxPriority = pxCurrentTCB->uxPriority;
}
traceTASK_PRIORITY_INHERIT( pxTCB, pxCurrentTCB->uxPriority );
traceTASK_PRIORITY_INHERIT( pxMutexHolderTCB, pxCurrentTCB->uxPriority );
/* Inheritance occurred. */
xReturn = pdTRUE;
}
else
{
mtCOVERAGE_TEST_MARKER();
if( pxMutexHolderTCB->uxBasePriority < pxCurrentTCB->uxPriority )
{
/* The base priority of the mutex holder is lower than the
priority of the task attempting to take the mutex, but the
current priority of the mutex holder is not lower than the
priority of the task attempting to take the mutex.
Therefore the mutex holder must have already inherited a
priority, but inheritance would have occurred if that had
not been the case. */
xReturn = pdTRUE;
}
else
{
mtCOVERAGE_TEST_MARKER();
}
}
}
else
@ -3900,7 +3924,6 @@ TCB_t *pxTCB;
interrupt, and if a mutex is given by the holding task then it must
be the running state task. */
configASSERT( pxTCB == pxCurrentTCB );
configASSERT( pxTCB->uxMutexesHeld );
( pxTCB->uxMutexesHeld )--;
@ -3914,8 +3937,8 @@ TCB_t *pxTCB;
/* A task can only have an inherited priority if it holds
the mutex. If the mutex is held by a task then it cannot be
given from an interrupt, and if a mutex is given by the
holding task then it must be the running state task. Remove
the holding task from the ready list. */
holding task then it must be the running state task. Remove
the holding task from the ready list. */
if( uxListRemove( &( pxTCB->xStateListItem ) ) == ( UBaseType_t ) 0 )
{
taskRESET_READY_PRIORITY( pxTCB->uxPriority );
@ -3967,6 +3990,108 @@ TCB_t *pxTCB;
#endif /* configUSE_MUTEXES */
/*-----------------------------------------------------------*/
#if ( configUSE_MUTEXES == 1 )
void vTaskPriorityDisinheritAfterTimeout( TaskHandle_t const pxMutexHolder, UBaseType_t uxHighestPriorityWaitingTask )
{
TCB_t * const pxTCB = ( TCB_t * ) pxMutexHolder;
UBaseType_t uxPriorityUsedOnEntry, uxPriorityToUse;
const UBaseType_t uxOnlyOneMutexHeld = ( UBaseType_t ) 1;
if( pxMutexHolder != NULL )
{
/* If pxMutexHolder is not NULL then the holder must hold at least
one mutex. */
configASSERT( pxTCB->uxMutexesHeld );
/* Determine the priority to which the priority of the task that
holds the mutex should be set. This will be the greater of the
holding task's base priority and the priority of the highest
priority task that is waiting to obtain the mutex. */
if( pxTCB->uxBasePriority < uxHighestPriorityWaitingTask )
{
uxPriorityToUse = uxHighestPriorityWaitingTask;
}
else
{
uxPriorityToUse = pxTCB->uxBasePriority;
}
/* Does the priority need to change? */
if( pxTCB->uxPriority != uxPriorityToUse )
{
/* Only disinherit if no other mutexes are held. This is a
simplification in the priority inheritance implementation. If
the task that holds the mutex is also holding other mutexes then
the other mutexes may have caused the priority inheritance. */
if( pxTCB->uxMutexesHeld == uxOnlyOneMutexHeld )
{
/* If a task has timed out because it already holds the
mutex it was trying to obtain then it cannot of inherited
its own priority. */
configASSERT( pxTCB != pxCurrentTCB );
/* Disinherit the priority, remembering the previous
priority to facilitate determining the subject task's
state. */
traceTASK_PRIORITY_DISINHERIT( pxTCB, pxTCB->uxBasePriority );
uxPriorityUsedOnEntry = pxTCB->uxPriority;
pxTCB->uxPriority = uxPriorityToUse;
/* Only reset the event list item value if the value is not
being used for anything else. */
if( ( listGET_LIST_ITEM_VALUE( &( pxTCB->xEventListItem ) ) & taskEVENT_LIST_ITEM_VALUE_IN_USE ) == 0UL )
{
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. */
}
else
{
mtCOVERAGE_TEST_MARKER();
}
/* If the running task is not the task that holds the mutex
then the task that holds the mutex could be in either the
Ready, Blocked or Suspended states. Only remove the task
from its current state list if it is in the Ready state as
the task's priority is going to change and there is one
Ready list per priority. */
if( listIS_CONTAINED_WITHIN( &( pxReadyTasksLists[ uxPriorityUsedOnEntry ] ), &( pxTCB->xStateListItem ) ) != pdFALSE )
{
if( uxListRemove( &( pxTCB->xStateListItem ) ) == ( UBaseType_t ) 0 )
{
taskRESET_READY_PRIORITY( pxTCB->uxPriority );
}
else
{
mtCOVERAGE_TEST_MARKER();
}
prvAddTaskToReadyList( pxTCB );
}
else
{
mtCOVERAGE_TEST_MARKER();
}
}
else
{
mtCOVERAGE_TEST_MARKER();
}
}
else
{
mtCOVERAGE_TEST_MARKER();
}
}
else
{
mtCOVERAGE_TEST_MARKER();
}
}
#endif /* configUSE_MUTEXES */
/*-----------------------------------------------------------*/
#if ( portCRITICAL_NESTING_IN_TCB == 1 )
void vTaskEnterCritical( void )