Threadsafe (Inactive, code moved to concurrent-ruby gem and repo.)

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A collection of thread-safe versions of common core Ruby classes.

This code base is now part of the concurrent-ruby gem at The code in this repository is no longer maintained.


Add this line to your application's Gemfile:

gem 'thread_safe'

And then execute:

$ bundle

Or install it yourself as:

$ gem install thread_safe


require 'thread_safe'

sa = # supports standard forms
sh = # supports standard forms

ThreadSafe::Cache also exists, as a hash-like object, and should have much better performance characteristics esp. under high concurrency than ThreadSafe::Hash. However, ThreadSafe::Cache is not strictly semantically equivalent to a ruby Hash -- for instance, it does not necessarily retain ordering by insertion time as Hash does. For most uses it should do fine though, and we recommend you consider ThreadSafe::Cache instead of ThreadSafe::Hash for your concurrency-safe hash needs. It understands some options when created (depending on your ruby platform) that control some of the internals - when unsure just leave them out:

require 'thread_safe'

cache =


  1. Fork it
  2. Clone it (git clone [email protected]:you/thread_safe.git)
  3. Create your feature branch (git checkout -b my-new-feature)
  4. Build the jar (rake jar) NOTE: Requires JRuby
  5. Install dependencies (bundle install)
  6. Commit your changes (git commit -am 'Added some feature')
  7. Push to the branch (git push origin my-new-feature)
  8. Create new Pull Request