### Asynchronous programming in .NET by Gerardo Lijs Twitter @GerardoLijs April 2019 ## Content What is Asynchronous Programming CPU-bound vs IO-bound Obsolete patterns Tasks and async/await Practical Count(n => Enumerable.Range(2, (int)Math.Sqrt(n) - 1).All(i => n % i > 0)); } ## Asynchronous method Task GetPrimesCountAsync(int start, int count) { return Task.Run(() => of the time you will need asynchronous to deal with IO-bound operations and the times you will use CPU-bound operations you will probably use a library that provides asynchronous methods for you to interact

## +21 ## Hazard Pointer Synchronous Reclamation Beyond Concurrency TS2 ## MAGED MICHAEL ## Basic Hazard Pointer Algorithm Hazard pointers protect access to objects that may be removed concurrently [Image](/uploads/documents/1/7/5/a/175a94ae744d634a4a2d21a0d05b187f/p2_12.jpg) Safe to delete A SAFE RECLAMATION ## Concurrency TS2 Essential Hazard Pointer Interface class hazard_pointer { template ## Asynchronous Reclamation • Asynchronous reclamation is invoked when the number of retired objects reaches some threshold: • In

## +23 ## Taro: Task graph-based Asynchronous Programming Using C++ Coroutine DIAN-LUN LIN 20 23 October 01 - 06 ## Agenda • Understand the motivation behind Taro • Learn to use the Taro C++ programming Conclusion ## Synchronous/Asynchronous Mechanisms Synchronous Boil the water  Multitasking! Asynchronous Wait ![Image]( motivation behind Taro • We have presented the Taro C++ programming model - Synchronous and Asynchronous mechanisms • We have presented the Taro coroutine-aware scheduling algorithm • We have presented

Tornado [https://www.tornadoweb.org] is a Python web framework and asynchronous networking library, originally developed at FriendFeed [https://en.wikipedia.org/wiki/FriendFeed]. By using non-blocking __name__ == "__main__": asyncio.run(main()) This example does not use any of Tornado’s asynchronous features; for that see this simple chat room [https://github.com/tornadoweb/tornado/tree/stable/demos/chat] with only one thread per process. See the User's guide for more on Tornado's approach to asynchronous programming. While some support of WSGI is available in the tornado.wsgi module, it is not a

to access elements of the std::mdspan are blocking the arms need to operate asynchronously ## asynchronous dual arm control template struct bin_checker_t { using element_type private: Arbiter* checker_; }; github.com/griswaldbrooks/spanny2 ## asynchronous dual arm control template struct bin_checker_async_t { using element_type Arbiter* checker_; }; github.com/griswaldbrooks/spanny2 ## asynchronous dual arm control struct arbiter_dual_async { using result_type = std::expected

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Tornado [https://www.tornadoweb.org] is a Python web framework and asynchronous networking library, originally developed at FriendFeed [https://en.wikipedia.org/wiki/FriendFeed]. By using non-blocking listen(8888) tornado.ioloop.IOLoop.current().start() This example does not use any of Tornado’s asynchronous features; for that see this simple chat room [https://github.com/tornadoweb/tornado/tree/stable/demos/chat] with only one thread per process. See the User's guide for more on Tornado's approach to asynchronous programming. While some support of WSGI is available in the tornado.wsgi module, it is not a

checks ○ External packages - Localflavor - Comments - Formtools ○ Asynchronous support - Async views - Async safety - Async adapter functions “How-to” views via the links below: • The basics: URLconfs | View functions | Shortcuts | Decorators | Asynchronous Support • Reference: Built-in Views | Request/response objects | TemplateResponse objects • Writing your own checks - External packages - Localflavor - Comments - Formtools - Asynchronous support - Async views - Async safety - Async adapter functions # How to install Django

files, and abstracts away the underlying HTTP transport layer. - Can send both synchronous and asynchronous requests using the same interface without requiring a dependency on a specific event loop. - {"type":"User..." var_export($res->json()); // Outputs the JSON decoded data // Send an asynchronous request. $req = $client->createRequest('GET', 'http://html.org', ['future' FAQ • Why should I use Guzzle? • Does Guzzle require cURL? • Can Guzzle send asynchronous requests? • How can I add custom cURL options? • How can I add custom stream context

events, CompletionToken& token); ## Events Complex asynchronous operations contain many parts Encapsulating increasing complexity creates a shared framework async_wait(CompletionToken&& token); }; ## I njecting Asynchronous Operations If an asynchronous operation completes immediately (that is, within the thread of execution calling functions Enforcing would leave performance on the table Can waive this requirement for injected asynchronous operations enum class query_driver_reason { error, cancel, complete, fail, abort }; struct qu

oldptr = src_.exchange(newptr); oldptr->retire(); // Pass to hazard pointer library for safe reclamation. } ## P3135R1: Hazard Pointer Extensions (beyond C++26) P3135R1: Hazard Pointer Extensions • Execution of Asynchronous Reclamation Proposed standard extensions: • Synchronous reclamation • Batch creation and destruction Hazard Pointer Execution of Asynchronous Reclamation ## Hazard Pointer Pointer Execution of Asynchronous Reclamation Using C++26 Possible inline asynchronous reclamation void worker() { /* ... */ obj->retire(); // Possible inline reclamation. } Using a separate