Continuations: The magic behind virtual threads in Java
summary
Claims that Continuations power virtual threads and that a simple VirtualThread built from the Continuation API can pause, unmount and resume across carriers. Implements a scheduler (queue + fixed thread pool of platform threads), simulates blocking with a Timer that yields and later resumes a continuation, and measures scale: 2,000 virtual threads on 10 platform threads complete while the equivalent runnable-based run takes minutes (demo shows ~15 minutes). Code runs and demonstrates mounting/unmounting and higher throughput.
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chapters (7)
- 0:00Virtual threads intro
- 2:10How virtual threads work
- 9:36Understanding continuations
- 19:58Practical uses of continuations
- 27:14Building virtual thread
- 44:36Virtual threads scalability demo
- 45:17Summary
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