How is lazySet in Java's Atomic* classes implemented?

Question

In this video about Disruptor, a concurrency framework, the lazySet method of Java\'s Atomic* classes (e.g. AtomicLong) is mentioned. According to the documentation, this method

Answer 1

Found this description of the implementation in Bug 6275329:

The semantics are that the write is guaranteed not to be re-ordered with any previous write, but may be reordered with subsequent operations (or equivalently, might not be visible to other threads) until some other volatile write or synchronizing action occurs).

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For people who like to think of these operations in terms of machine-level barriers on common multiprocessors, lazySet provides a preceeding store-store barrier (which is either a no-op or very cheap on current platforms), but no store-load barrier (which is usually the expensive part of a volatile-write)