Discussion
Assertion: declaring a shared variable volatile makes access to it atomic. Reason: the qualifier prevents the compiler from caching the value.
Answer: B
The reason is a correct account of what volatile does, and it has nothing to do with atomicity: a preemption can still fall between the two halves of a 32-bit access on an 8-bit core. Atomicity needs a lock, a critical section or an atomic instruction.
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