vCoRoutineSchedule to xCoRoutineSchedule

sashiono wrote on Wednesday, September 12, 2007:

proposed change/addition to vCoRoutineSchedule to xCoRoutineSchedule

instead of returning void I would like to return the true if a co-routine is ready to be scheduled, otherwise false if all the co-routines are blocked.

something like this

signed portBASE_TYPE xCoRoutineSchedule( void )
    /* See if any co-routines readied by events need moving to the ready lists. */

    /* See if any delayed co-routines have timed out. */

    /* Find the highest priority queue that contains ready co-routines. */
    while( listLIST_IS_EMPTY( &( pxReadyCoRoutineLists[ uxTopCoRoutineReadyPriority ] ) ) )
        if( uxTopCoRoutineReadyPriority == 0 )
            /* No more co-routines to check. */
            return pdFALSE;

    /* listGET_OWNER_OF_NEXT_ENTRY walks through the list, so the co-routines
     of the    same priority get an equal share of the processor time. */
    listGET_OWNER_OF_NEXT_ENTRY( pxCurrentCoRoutine, &( pxReadyCoRoutineLists[ uxTopCoRoutineReadyPriority ] ) );

    /* Call the co-routine. */
    ( pxCurrentCoRoutine->pxCoRoutineFunction )( pxCurrentCoRoutine, pxCurrentCoRoutine->uxIndex );

    return pdTRUE;

The reason this would be useful is for power reduction for example, the IdleHook can look something like this now.

void vApplicationIdleHook( void )
    if(xCoRoutineSchedule() == pdFALSE)
        //Idle the CPU
                 PCON  = 0x1;        //IDle Mode

I haven’t tested this yet, but I think it should work fine.

sashiono wrote on Friday, September 21, 2007:

i have been running this mod for a while now and it works well.

sashiono wrote on Sunday, November 18, 2007:

any input into including this mod into the next release? I find it quite useful for power reduction.

rtel wrote on Sunday, November 18, 2007:

Thanks for your suggestion.  I would be grateful if you could add this to the Feature Request tracker under SourceForce.  That way I will not forget it :o)


sashiono wrote on Wednesday, November 21, 2007:

I didn’t know if you actually took requests posted in the Feature Request tracker.   I posted up the suggestion.

Btw, Keep up the good work. FreeRTOS is getting better every day.