Issue #12607 has been updated by chrisseaton (Chris Seaton).


> What is the use case for this atomic integer?

For example for issuing unique IDs across multiple Ractors.

> or in fact any integer atomic operations other than += 1

For example a CAS to update a bank balance is a common requirement.

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Feature #12607: Ruby needs an atomic integer
https://bugs.ruby-lang.org/issues/12607#change-89934

* Author: shyouhei (Shyouhei Urabe)
* Status: Feedback
* Priority: Normal
* Assignee: ko1 (Koichi Sasada)
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(This one was derived from bug #12463)

Although I don't think += would become atomic, at the same time I understand Rodrigo's needs of _easier_ counter variable that resists inter-thread tampering.  I don't think ruby's Integer class can be used for that purpose for reasons (mainly because it is not designed with threads in mind).  Rather we should introduce a integer class which is carefully designed.

Why not import Concurrent::AtomicFixnum into core?



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