Updates vCoRoutineSchedule() so it returns without doing anything if if the co-routine internal data structures have not been initialised. The internal data structures are initialised when the first co-routine is created.

NOTE: Co-routines are a deprecated feature.  This change was made to close off an old ticket as the source control transitions from SourceForge to Github.

croutine.c

@@ -45,8 +45,8 @@
 static List_t pxReadyCoRoutineLists[ configMAX_CO_ROUTINE_PRIORITIES ];	/*< Prioritised ready co-routines. */
 static List_t xDelayedCoRoutineList1;									/*< Delayed co-routines. */
 static List_t xDelayedCoRoutineList2;									/*< Delayed co-routines (two lists are used - one for delays that have overflowed the current tick count. */
-static List_t * pxDelayedCoRoutineList;									/*< Points to the delayed co-routine list currently being used. */
+static List_t * pxDelayedCoRoutineList = NULL;							/*< Points to the delayed co-routine list currently being used. */
-static List_t * pxOverflowDelayedCoRoutineList;							/*< Points to the delayed co-routine list currently being used to hold co-routines that have overflowed the current tick count. */
+static List_t * pxOverflowDelayedCoRoutineList = NULL;							/*< Points to the delayed co-routine list currently being used to hold co-routines that have overflowed the current tick count. */
 static List_t xPendingReadyCoRoutineList;								/*< Holds co-routines that have been readied by an external event.  They cannot be added directly to the ready lists as the ready lists cannot be accessed by interrupts. */
 
 /* Other file private variables. --------------------------------*/
@@ -277,6 +277,11 @@ CRCB_t *pxCRCB;
 
 void vCoRoutineSchedule( void )
 {
+	/* Only run a co-routine after prvInitialiseCoRoutineLists() has been
+	called.  prvInitialiseCoRoutineLists() is called automatically when a
+	co-routine is created. */
+	if( pxDelayedCoRoutineList != NULL )
+	{
 		/* See if any co-routines readied by events need moving to the ready lists. */
 		prvCheckPendingReadyList();
 
@@ -300,6 +305,7 @@ void vCoRoutineSchedule( void )
 
 		/* Call the co-routine. */
 		( pxCurrentCoRoutine->pxCoRoutineFunction )( pxCurrentCoRoutine, pxCurrentCoRoutine->uxIndex );
+	}
 
 	return;
 }