This is a library for asynchronous IO using io_uring for C++20. Most of the code in this repository was once part of liburingpp and htcpp and some of it is still in there until it is properly integrated into this repository (mostly TLS related).

It provides an IoQueue abstraction to issue IO operations with completion callbacks (see examples).

There is also early support for issuing IO operations on an IoQueue using coroutines, examples of which can also be found in the examples directory.

It's a pretty boring CMake project, but it simply uses find_path/find_library to find liburing and find_package to find spdlog and fmt, so make sure to install those with your system package manager. On PopOS they are named liburing-dev, libspdlog-dev and libfmt-dev respectively.

Then just do "ye old CMake dance":

$ cmake -B build -G Ninja
$ cmake --build build

• Optimize CompleterMap (linear probing is BAD) and CompleterMap is a bottleneck (~15% of runtime)
• Multi-Shot Accept
• Test if I can get rid of the whole callback path with just adding Awaitable::execute(Func func), i.e. if using it has any measurable cost, which I want to be able to avoid. If there is no significant cost, cut the whole callback path.
• Figure out and finish timeouts and cancellation
• Add an TcpStream and then SslStream.
• Move all the TLS stuff from htcpp into this repository