I would actually go with the
var myList = newList
approach
Well, maybe rwlocks are even faster then above approach.
You _would_have to make myList volatile, as otherwise you don't have an ordering guarantee between creating the new list and assigning the reference to myList.
You could end up with a window during which myList points to a not yet initialized list
And accessing volatiles might be slower than taking a rwlock for reading
