Why User Mode Threads Are Often the Correct Answer

Concurrency is the problem of scheduling simultaneous, largely-independent tasks, competing for resources in order to increase application throughput. Multiple approaches to scalable concurrency are used in various programming languages: using OS threads, asynchronous programming styles (“reactive”), syntactic stackless coroutines (async/await), and user-mode threads (fibres). This talk will explore the problem, explain why Java has chosen user-mode threads to tackle it, and compare the various approaches and the tradeoffs they entail.

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