CS 260r 2017 L19: Verifying RCU (4/4)
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Question 1
Given a singly-linked RCU list of ints, the following code returns the first int (or -1 if the list is empty): {{ head = rcuReadStart(list); i = head ? head->data : -1; rcuQuiescentState(list, list->wcounter); return i; }} This code should verify given the RCU specifications in Figure 3, but if you switched the order of the `i` assignment with `rcuQuiescentState`, the code would be incorrect and would not verify. Why not? Give an intuitive answer, a specific answer involving Figure 3, or, preferably, both.
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