Question: Consider a pair of processes in a shared memory system such that process A updates a data structure, and then sets a flag to indicate

Consider a pair of processes in a shared memory system such that process A updates a data structure, and then sets a flag to indicate that the update is completed. Process B monitors the flag, and starts processing the data structure only after it finds the flag is set.

Explain the problems that could arise in a memory architecture where writes may be reordered, and explain how the sfence and lfence instructions can be used to ensure the problem does not occur.

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