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thread_local_variables

🧵 Leverage Thread-local Variables​

Store per-thread data using Thread#[] to avoid cross-talk. This is handy for caching or context passing without global state.

Thread.new do
  Thread.current[:request_id] = SecureRandom.uuid
  puts "Handling request #{Thread.current[:request_id]}"
  # ... perform work, other methods can read Thread.current[:request_id]
end.join

Each thread has its own :request_id, so you can safely log or track data without collisions.