Thread Safety First!
summary
Demo uses Ruby 2.0 and jruby174 and runs with 200 threads (and sometimes 10) against a shared Set (a Hash derivative) inside the MongoDB Ruby driver. Execution on JRuby sometimes raises can't add a new key into hash during iteration, exposing different semantics across MRI and JRuby. The talk shows fixing it with fine‑grained locking and mutex and condition variable patterns, plus testing across implementations and heavy threading to reproduce race conditions.
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chapters (7)
- 0:00Introduction and demo
- 1:37Threading models compared
- 4:02Metaphor for threading
- 6:45Shared state in practice
- 10:16Concurrency primitives
- 14:04Resource management
- 15:47Testing and conclusion
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