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Fix xTaskNotifyWait & ulTaskNotifyTake determinism. #833

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merged 6 commits into from
Oct 17, 2023
Merged

Fix xTaskNotifyWait & ulTaskNotifyTake determinism. #833

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e654143
Fix task notification determinism.
Oct 13, 2023
1043460
Fix formatting.
Oct 13, 2023
acbb51b
Remove duplicate statement
kar-rahul-aws Oct 13, 2023
2c7e573
Merge branch 'main' into pr_625_final
aggarg Oct 16, 2023
3df0cba
Code review suggestions
aggarg Oct 16, 2023
3d8e07e
Merge branch 'main' into pr_625_final
aggarg Oct 17, 2023
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107 changes: 72 additions & 35 deletions tasks.c
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Original file line number Diff line number Diff line change
Expand Up @@ -5127,7 +5127,7 @@ void vTaskPlaceOnEventList( List_t * const pxEventList,

configASSERT( pxEventList );

/* THIS FUNCTION MUST BE CALLED WITH EITHER INTERRUPTS DISABLED OR THE
/* THIS FUNCTION MUST BE CALLED WITH THE
* SCHEDULER SUSPENDED AND THE QUEUE BEING ACCESSED LOCKED. */

/* Place the event list item of the TCB in the appropriate event list.
Expand Down Expand Up @@ -7415,23 +7415,39 @@ TickType_t uxTaskResetEventItemValue( void )
configASSERT( uxIndexToWaitOn < configTASK_NOTIFICATION_ARRAY_ENTRIES );

taskENTER_CRITICAL();

/* Only block if the notification count is not already non-zero. */
if( pxCurrentTCB->ulNotifiedValue[ uxIndexToWaitOn ] == 0UL )
{
/* Only block if the notification count is not already non-zero. */
if( pxCurrentTCB->ulNotifiedValue[ uxIndexToWaitOn ] == 0UL )
/* Mark this task as waiting for a notification. */
pxCurrentTCB->ucNotifyState[ uxIndexToWaitOn ] = taskWAITING_NOTIFICATION;

if( xTicksToWait > ( TickType_t ) 0 )
{
/* Mark this task as waiting for a notification. */
pxCurrentTCB->ucNotifyState[ uxIndexToWaitOn ] = taskWAITING_NOTIFICATION;
prvAddCurrentTaskToDelayedList( xTicksToWait, pdTRUE );
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traceTASK_NOTIFY_TAKE_BLOCK( uxIndexToWaitOn );

if( xTicksToWait > ( TickType_t ) 0 )
{
prvAddCurrentTaskToDelayedList( xTicksToWait, pdTRUE );
traceTASK_NOTIFY_TAKE_BLOCK( uxIndexToWaitOn );
/* Suspend the scheduler before enabling interrupts. */
vTaskSuspendAll();
taskEXIT_CRITICAL();

prvAddCurrentTaskToDelayedList( xTicksToWait, pdTRUE );

/* All ports are written to allow a yield in a critical
* section (some will yield immediately, others wait until the
* critical section exits) - but it is not something that
* application code should ever do. */
taskYIELD_WITHIN_API();
/* All ports are written to allow a yield in a critical
* section (some will yield immediately, others wait until the
* critical section exits) - but it is not something that
* application code should ever do. */
if( xTaskResumeAll() == pdFALSE )
{
#if ( configNUMBER_OF_CORES == 1 )
{
portYIELD_WITHIN_API();
}
#else
{
vTaskYieldWithinAPI();
}
#endif
}
else
{
Expand All @@ -7440,10 +7456,13 @@ TickType_t uxTaskResetEventItemValue( void )
}
else
{
mtCOVERAGE_TEST_MARKER();
taskEXIT_CRITICAL();
}
}
taskEXIT_CRITICAL();
else
{
taskEXIT_CRITICAL();
}

taskENTER_CRITICAL();
{
Expand Down Expand Up @@ -7493,28 +7512,43 @@ TickType_t uxTaskResetEventItemValue( void )
configASSERT( uxIndexToWaitOn < configTASK_NOTIFICATION_ARRAY_ENTRIES );

taskENTER_CRITICAL();

/* Only block if a notification is not already pending. */
if( pxCurrentTCB->ucNotifyState[ uxIndexToWaitOn ] != taskNOTIFICATION_RECEIVED )
{
/* Only block if a notification is not already pending. */
if( pxCurrentTCB->ucNotifyState[ uxIndexToWaitOn ] != taskNOTIFICATION_RECEIVED )
/* Clear bits in the task's notification value as bits may get
* set by the notifying task or interrupt. This can be used to
* clear the value to zero. */
pxCurrentTCB->ulNotifiedValue[ uxIndexToWaitOn ] &= ~ulBitsToClearOnEntry;

/* Mark this task as waiting for a notification. */
pxCurrentTCB->ucNotifyState[ uxIndexToWaitOn ] = taskWAITING_NOTIFICATION;

if( xTicksToWait > ( TickType_t ) 0 )
{
/* Clear bits in the task's notification value as bits may get
* set by the notifying task or interrupt. This can be used to
* clear the value to zero. */
pxCurrentTCB->ulNotifiedValue[ uxIndexToWaitOn ] &= ~ulBitsToClearOnEntry;
traceTASK_NOTIFY_WAIT_BLOCK( uxIndexToWaitOn );

/* Mark this task as waiting for a notification. */
pxCurrentTCB->ucNotifyState[ uxIndexToWaitOn ] = taskWAITING_NOTIFICATION;
/* Suspend the scheduler before enabling interrupts. */
vTaskSuspendAll();
taskEXIT_CRITICAL();

if( xTicksToWait > ( TickType_t ) 0 )
{
prvAddCurrentTaskToDelayedList( xTicksToWait, pdTRUE );
traceTASK_NOTIFY_WAIT_BLOCK( uxIndexToWaitOn );
prvAddCurrentTaskToDelayedList( xTicksToWait, pdTRUE );

/* All ports are written to allow a yield in a critical
* section (some will yield immediately, others wait until the
* critical section exits) - but it is not something that
* application code should ever do. */
taskYIELD_WITHIN_API();
/* All ports are written to allow a yield in a critical
* section (some will yield immediately, others wait until the
* critical section exits) - but it is not something that
* application code should ever do. */
if( xTaskResumeAll() == pdFALSE )
{
#if ( configNUMBER_OF_CORES == 1 )
{
portYIELD_WITHIN_API();
}
#else
{
vTaskYieldWithinAPI();
}
#endif
}
else
{
Expand All @@ -7523,10 +7557,13 @@ TickType_t uxTaskResetEventItemValue( void )
}
else
{
mtCOVERAGE_TEST_MARKER();
taskEXIT_CRITICAL();
}
}
taskEXIT_CRITICAL();
else
{
taskEXIT_CRITICAL();
}

taskENTER_CRITICAL();
{
Expand Down
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