For example, the semantics of volatile are not strong enough to make the increment operation (x++) atomic, unless you can guarantee that the variable is written only from a single thread.Atomicity of ++ on volatile variables (or non-volatile for that matter) is not guaranteed. volatile x ++ is treated as load x, add 1, store x. A second thread doing x ++ could interleave, causing x to be incremented only once.
Java Concurrency in Practice
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