If tickless idle mode is in use then ensure prvResetNextTaskUnblockTime() is called after a task is unblocked due to a bit being set in an event group. This allows the MCU to re-enter sleep mode at the earliest possible time (rather than waiting until the timeout that would occur had the task not being unblocked be the event group) and matches a similar change made for queues and derivative objects (semaphores, etc.) some time ago.

git-svn-id: http://svn.code.sf.net/p/freertos/code/trunk@2796 1d2547de-c912-0410-9cb9-b8ca96c0e9e2

1 files changed, 16 insertions, 0 deletions

diff --git a/FreeRTOS/Source/tasks.c b/FreeRTOS/Source/tasks.c
index c6bcb6828..e62b38860 100644
--- a/FreeRTOS/Source/tasks.c
+++ b/FreeRTOS/Source/tasks.c
@@ -3317,6 +3317,20 @@ TCB_t *pxUnblockedTCB;
 	configASSERT( pxUnblockedTCB );

 	( void ) uxListRemove( pxEventListItem );

 

+	#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

+

 	/* 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. */

@@ -3597,6 +3611,8 @@ static portTASK_FUNCTION( prvIdleTask, pvParameters )
 	const UBaseType_t uxNonApplicationTasks = 1;

 	eSleepModeStatus eReturn = eStandardSleep;

 

+		/* This function must be called from a critical section. */

+

 		if( listCURRENT_LIST_LENGTH( &xPendingReadyList ) != 0 )

 		{

 			/* A task was made ready while the scheduler was suspended. */