Tokio Core Queue-Based Modules in Tokio • Channel • Scheduler • Tokio uses Channel for communication between threads (incl. pthread, co-routines). • Channel allows a unidirectional flow of information Receiver. • Channel Type: SPSC, SPMC, MPMC, MPSC. Senders Receive Senders Senders Receive Receivers Perf Gaps: CAS(Compare And Swap) can't perfectly scale with core count. Tokio Channel • Each memory/cache latency • No CPU cycles DLB-Assist Channel Intro Hardware Senders Receive Senders Senders Receive Receivers Channel/Queue DLB-Assist Channel removes the penalty of CAS to achieve a safety-guaranteed

https://crates.io/crates/tokio • Job Scheduler: https://crates.io/crates/tokio-cron-scheduler • MPMC Channel: https://crates.io/crates/flume • Web Service: • Framework: https://crates.io/crates/actix-web blocking code Tokio - Notes • 使用非阻塞或并发 / 异步数据结构 • 使用异步锁和异步 Channel 。 • 使用 spawn_blocking 提交耗时任务 • C FFI 调用时，要关注上下文的线程安全性。 • 多个运行时之间使用 Channel 通信，降低锁使用范围。 Tokio - Graceful Stop • futures::future::Abortable 内使用 tokio::select! 宏执行相关取消操作。 • tokio::signal::ctrl_c 接收 Ctrl-C 信号，可用于最终程序退出时的取 消操作。 • 谨慎处理任务中 channel 的结束信号。 • cancel vs. abort ： Cancel 处理按预期退出， Abort 要保证安全退 出。 • 处理非正常退出（断电、 kill -9 等），保证系统安全性。

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Gábor Horváth Gabor.Horvath@microsoft.com @XazaxHunWelcome to CppCon 2021! Join #visual_studio channel on CppCon Discord https://aka.ms/cppcon/discord • Meet the Microsoft C++ team • Ask any questions explicit can help analysis, improve readabilityEnjoy the rest of the conference! Join #visual_studio channel on CppCon Discord https://aka.ms/cppcon/discord • Meet the Microsoft C++ team • Ask any questions

Product Team, Microsoft @VisualC https://aka.ms/cpp Welcome to CppCon 2021! Join #visual_studio channel on CppCon Discord https://aka.ms/cppcon/discord • Meet the Microsoft C++ team • Ask any questions Code CppCon 2021 Happy Coding! Thank you Enjoy the rest of the conference! Join #visual_studio channel on CppCon Discord https://aka.ms/cppcon/discord • Meet the Microsoft C++ team • Ask any questions

Natsuhara@microsoft.com Software Engineer, Visual C++ LibrariesWelcome to CppCon 2021! Join #visual_studio channel on CppCon Discord https://aka.ms/cppcon/discord • Meet the Microsoft C++ team • Ask any questions ever could have imagined :)53 Questions?Enjoy the rest of the conference! Join #visual_studio channel on CppCon Discord https://aka.ms/cppcon/discord • Meet the Microsoft C++ team • Ask any questions

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