one-ring-loop 0.2.1

Custom async event loop built on io_uring with structured concurrency, file/socket IO, and timers

one-ring-loop

Custom async event loop built on one-ring-core and Linux io_uring.

Part of the one-ring project.

What it provides

• Task scheduling with Task and TaskGroup (structured concurrency)
• File IO - async file operations via io_uring
• Socket IO - TCP server/client with create_server, Connection.receive/send
• Timers - async sleep backed by io_uring timeouts
• Streams - buffered byte streams, TLS wrapping, memory streams
• Cancellation - move_on_after/fail_after scoped timeout/cancellation

Example

from one_ring_loop import TaskGroup, run
from one_ring_loop.socketio import Connection, create_server

def echo_handler(conn):
    try:
        while True:
            data = yield from conn.receive(1024)
            if not data:
                break
            yield from conn.send(b"Echo: " + data)
    finally:
        yield from conn.close()

def main():
    server = yield from create_server(b"0.0.0.0", 9999)
    tg = TaskGroup()
    tg.enter()
    try:
        while True:
            conn = yield from server.accept()
            tg.create_task(echo_handler(conn))
    finally:
        yield from tg.exit()
        yield from server.close()

run(main())

Requirements

• Linux with io_uring support (kernel 6.7+)
• Python 3.14+

Installation

uv add one-ring-loop

License

MIT