From 392726f8e4348b719ec56ba4603a79a8f89efec5 Mon Sep 17 00:00:00 2001 From: rtel Date: Fri, 3 Jan 2020 22:50:31 +0000 Subject: [PATCH] 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: https://svn.code.sf.net/p/freertos/code/trunk@2796 1d2547de-c912-0410-9cb9-b8ca96c0e9e2 --- FreeRTOS/Source/tasks.c | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) 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. */ -- 2.39.5