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...lement, another thread deletes several elements from the head of the list (returning them to the freelist) but then creates new elements at the head, where t ...when the thread allocates new elements to insert at the head of the list, return the same memory addresses as before (perhaps using an internal freelist for

..., an element must be ''in'' the list - otherwise, how else can the reading thread even know of the existence of that element? So we see that inherent in the ...n is called. These expectations are honoured; if the "add" functions have returned, their effects will be seen by any "read" function which occurs afterward