Issue #17433 has been reported by nobu (Nobuyoshi Nakada).

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Feature #17433: Expose atomic operation macros with RUBY prefix
https://bugs.ruby-lang.org/issues/17433

* Author: nobu (Nobuyoshi Nakada)
* Status: Open
* Priority: Normal
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Because of Ractor, now we need synchronization more widely in extension libraries.
Atomic operations are lighter than mutex, and enough in many cases.
https://github.com/ruby/ruby/pull/3983



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