Uvent

High-performance asynchronous I/O library for C++23.

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Features

• C++23: modern standard with coroutines and atomic primitives.
• Event loop: non-blocking, scalable, based on epoll/kqueue.
• Sockets: TCP/UDP (client and server).
• Timers: custom TimerWheel with minimal overhead.
• Queues & synchronization: lock-free data structures, QSBR, and reference counting.
• Custom frames: ability to override coroutine promise frames (AwaitableFrameBase), enabling custom scheduling and integration.

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Build & Installation

git clone https://github.com/Usub-development/uvent.git
cd uvent
mkdir build && cd build
cmake ..
make -j

Quick example

// simple echo-like server using uvent

task::Awaitable<void> clientCoro(net::TCPClientSocket socket) {
    utils::DynamicBuffer buf;
    buf.reserve(64 * 1024);

    // read from client
    ssize_t rdsz = co_await socket.async_read(buf, buf.capacity());

    // handle request / send response here ...
    co_return;
}

task::Awaitable<void> listeningCoro() {
    // listen on TCP port 45900
    auto acceptor = net::TCPServerSocket{"0.0.0.0", 45900};

    for (;;) {
        // accept new client
        auto soc = co_await acceptor.async_accept();

        // spawn client handler in event loop
        if (soc) system::co_spawn(clientCoro(std::move(soc.value())));
    }
}

int main() {
    // global settings
    settings::timeout_duration_ms = 5000;

    // add server coroutine to global task queue
    system::co_spawn(listeningCoro());

    // run event loop with 4 worker threads
    usub::Uvent uvent(4);
    uvent.run();

    return 0;
}