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StephenCleary.com async Future // In the Real World, we would actually do something... await Future async await yield

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StephenCleary.com async Future // In the Real World, we would actually do something... await Future await async Future Future Future await

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StephenCleary.com async Future // In the Real World, we would actually do something... await Future await

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StephenCleary.com async Future // In the Real World, we would actually do something... await Future

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StephenCleary.com Next: • C++ (n4680 Coroutines) – C++20? • Kotlin (experimental coroutines in 1.1) • Rust (nightly since 2017-08) Timeline

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StephenCleary.com Multithreaded Reactive (Event-Driven) Asynchronous Parallel Concurrent

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StephenCleary.com User mode Kernel mode My code OS Device driver OVERLAPPED IRP ISR APC blog.stephencleary.com/2013/11/there-is-no-thread.html State: Created. State: In progress. State: Complete.

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StephenCleary.com User mode Kernel mode My code OS Device driver Thread IRP ISR APC blog.stephencleary.com/2013/11/there-is-no-thread.html State: Created. State: In progress. State: Complete/Running. State: Blocked.

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StephenCleary.com Asynchronous API (complex) Synchronous API (simple) Synchronous API (simple) Asynchronous API (complex)

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StephenCleary.com Asynchronous API (complex) Synchronous API (simple) Synchronous API (simple) Asynchronous API (complex)

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StephenCleary.com

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StephenCleary.com Client Server Primary benefit: Responsiveness Primary benefit: Scalability Keep UI thread free Minimize threads used to serve requests Better UX 10x-100x scalability (same box) Required by many app stores Faster response to bursting traffic

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StephenCleary.com Client (Desktop) Server (On-Premises)

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StephenCleary.com Client (Mobile) Server (Cloud)

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StephenCleary.com Async/Await Futures / Continuations Callbacks Events Time

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Task Promise

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Image from Etsy user Rosewine; used with permission