Ractor::TVar

Software transactional memory implementation for Ractor and Thread on Ruby 3.0.

require 'ractor/tvar'

tv = Ractor::TVar.new(0)

N = 10_000

r = Ractor.new tv do |tv|
  N.times do
    Ractor.atomically do
      tv.value += 1
    end
   end
end

N.times do
  Ractor.atomically do
    tv.value += 1
  end
end

r.take # wait for the ractor

p tv.value #=> 20000 (= N * 2)

This script shows that there is no race between ractors.

You need recent Ruby 3.0 (development).

Add this line to your application's Gemfile:

gem 'ractor-tvar'

And then execute:

$ bundle install

Or install it yourself as:

$ gem install ractor-tvar

After checking out the repo, run bin/setup to install dependencies. Then, run rake test-unit to run the tests. You can also run bin/console for an interactive prompt that will allow you to experiment.

To install this gem onto your local machine, run bundle exec rake install. To release a new version, update the version number in version.rb, and then run bundle exec rake release, which will create a git tag for the version, push git commits and the created tag, and push the .gem file to rubygems.org.

Bug reports and pull requests are welcome on GitHub at https://github.com/ko1/ractor-tvar.

The gem is available as open source under the terms of the MIT License.