Hi, I’m reading section 9.5.4.9, in the second to the last paragraph, there is: Before the first horizontal line, all readers see the leftmost myconfig structure, and after the second horizontal line, all readers will see the rightmost structure. Between the two lines, that is, during the grace period, different readers might see different objects I’m a little confused, in Figure 9.29, the xchg is before the first horizontal line, in my understanding, if the reader’s reading is before the xchg, it will read the leftmost myconfg structure. So, are there some conflicts between the paragraph and the figure? Please correct me if I’m wrong. Thanks, Alan