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Source code for CoReadTextFile() which is also a coroutine: https://github.com/CM4all/libcommon/blob/master/src/io/uring...
Sample code for libpq: https://github.com/CM4all/libcommon/blob/master/test/co/RunC... and c_ares https://github.com/CM4all/libcommon/blob/master/test/co/RunC... and libcurl https://github.com/CM4all/libcommon/blob/master/test/curl/Ru...
I wrote all of this for proprietary applications at dayjob, but the core library is open source, as is much of my dayjob code. The I/O event loop this integrates with is also used by several open source projects I maintain, e.g. the Music Player Daemon (https://github.com/MusicPlayerDaemon/MPD/tree/master/src/eve...) which can also take advantage of io_uring, though not (yet) with coroutines, only "classic" non-blocking I/O.
My code is optimized for low-overhead; the very core doesn't even use std::function because I fear its implicit heap allocations. Long ago, I used boost::asio (which also integrates well with coroutines) but didn't like it because it was too bloated for me.
I've rarely seen other nerds talk about C++ coroutines, and never about integrating them with io_uring, made me thinking I'm the only one. But maybe all the others just don't write/blog about it - I never did either...
> Would you consider adding a kqueue implementation?
Can't do, I don't have Apple or BSD anywhere. But if code for it were submitted to me, I would gladly merge it (and try to keep the CI happy).
The MPD version of the event loop is portable and runs on macOS/BSD/Windows, but no kqueue, only poll() (and select() on Windows). This old-school API has its scalability problems, of course, but that matters not so much for MPD.
The event loop can already do Coroutines on all supported targets; here's another open source project where I use this library: https://github.com/XCSoar/XCSoar/tree/master/src/event/ - it's a flight computer (yes, for real airplanes) which also runs on Windows and macOS and iOS, and runs libcurl (and other stuff) as coroutine.
If you want to use my library and need help with integrating it or with adding kqueue support, get in touch with me.
I recently built something to connect asio with gRPC: https://github.com/WolleTD/asio-grpc-callback
The channels and co_yield-capable coros from asio::experimental are quite fun to use for streams.