coroutines A lot of existing code mostly callback-based A custom-built I/O event loop predates Asio by a decade fine-tuned for specific use cases Somewhat conservative audience real benefit needs std::array buf(1024); asio::co_spawn( ex, [&s, &buf]() -> asio::awaitable { co_await s.read_some(s, asio::buffer(buf), asio::use_awaitable); }, asio::detached); } No way to figure out task lifetime => no automatic object lifetime managementDetached tasks considered harmful // don’t

to handle query Front-end and back-end communicate with separate protocol Back-end implemented with Asio Queries serviced by proprietary database back-end (written in C++) 4 DataConn TCP protocol without template auto with_pool(Configuration& config, thread_pool& pool); void thread_start(asio::io_context& ctx); }; 36 template struct connection_state { using query_type = template connection_state(asio::ip::tcp::socket s, asio::ip::tcp::endpoint local, asio::ip::tcp::endpoint remote, Configuration& config, WithPool& with_pool);

Leahy - rleahy@rleahy.caNetworking TS & Asio ISO C++ Networking is blocked on Executors (P0443) Target for Networking is currently C++23 (P0592) Used standalone Asio (1.18.0) to prepare these slides Using Using the P0443-friendly extensions to the Networking TS shipping in “standalone” Asio & Boost.Asio (P0958) 2async_wait_then_write 3Composed Asynchronous Operations Composing asynchronous operations

in practice • concurrent queues • networking sockets io_context, resolver, acceptor, end_point, asio::buffer, async_read/write, serialization... 54Communication? • Abstraction: channels... or actors in practice • concurrent queues • networking sockets io_context, resolver, acceptor, end_point, asio::buffer, async_read/write, serialization... 55Communication? • Abstraction: channels... or actors

need to be able to stop if one thread encounters an error 30 class thread_pool { struct state : ::asio::io_context { std::thread thread; }; using states_type = std::list; states_type states_;

program is fundamentally multithreaded, look for higher-level facilities: promise/future, coroutines, ASIO, TBB 51Questions? followed by some bonus slidesBonus: C++20 std::atomic_ref ● Basically, std::atomic

engine implements by itself • A C++ standard library version would be seen as something useful • Boost ASIO seems “heavy” to most SG14 contributors, but a replacement for C sockets would be a huge win •

known software that installs Intel libraries to C:\Windows\System32: • Amplitube, by IK Multimedia • ASIO4ALL, by Michael Tippach If you find others, please let us know. If you're on this list and you want

known software that installs Intel libraries to C:\Windows\System32: • Amplitube, by IK Multimedia • ASIO4ALL, by Michael Tippach If you find others, please let us know. If you're on this list and you want

specified in the conanfile. The name of the files follow the pattern Find.cmake. So for the asio/1.14.0 package, a Findasio. cmake file will be generated. Variables in Find.cmake Being