Regarding your question: Is the atomic{}; construct equivalent to the
STM concept?
The technical details matter, so please read the language spec, Section
14.7. There are many STM definitions, so you will need to read the spec
to figure out how the spec relates to the STM that you care about.
The short answer is that, in general, an STM may be used to implement
X10 atomics, but so may locks.
The current implementation uses a single lock per place.
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