The main thing io_uring gives you is avoiding multiple syscalls. With a pipe you can’t really avoid that. With a shared memory queue/ring buffer you can write

The main thing io_uring gives you is avoiding multiple syscalls. With a pipe you can’t really avoid that. With a shared memory queue/ring buffer you can write to the memory without any syscalls. But you need to build synchronisation yourself (e.g., using semaphores for example). You don’t necessarily need to poll.