io_uring works fundamentally differently from polling loops and closer to Windows' IOCP (which is awesome and better than everything that existed on Linux for many years). With a polling loop you wait for data to be available in buffers, and then once you get the ready event, you copy it from the kernel's buffer to yours. With IOCP or io_uring, you submit a long-running read or write event directly into your buffer. You get the event after the read or write call, instead of before. Because of this, it's not possible to make it a drop-in replacement for poll/epoll.
libuv is more nearly designed for adding IOCP-like support to epoll systems than epoll to IOCP (though it can approximate either direction), so adding io_uring was already straightforward, by design
Aside: the wepoll mentioned in this repo is a standalone project extracted libuv, for projects that only desire to support Berkeley sockets and don’t care about other events sources (processes or pipes)
void *rwtask(param_t v) {
...
a = v->int_ptr;
...
free(a);
It seems architecturally unwise to have a callback responsible for freeing its parameters. At the very least this fossilizes dependency on the stdlib heap.
Why not io_uring? That's the biggest game changer.
I guess because it's not possible to abstract away as much.
Is this a Windows lib? The tradeoffs are probably completely different than what we're used to then.
> c-events provides function wrappers to some Linux like functionality, exp. mkfifo for Windows.
io_uring works fundamentally differently from polling loops and closer to Windows' IOCP (which is awesome and better than everything that existed on Linux for many years). With a polling loop you wait for data to be available in buffers, and then once you get the ready event, you copy it from the kernel's buffer to yours. With IOCP or io_uring, you submit a long-running read or write event directly into your buffer. You get the event after the read or write call, instead of before. Because of this, it's not possible to make it a drop-in replacement for poll/epoll.
didn't prevent libuv from adding support for it when available:
https://github.com/libuv/libuv/issues/1947
libuv is more nearly designed for adding IOCP-like support to epoll systems than epoll to IOCP (though it can approximate either direction), so adding io_uring was already straightforward, by design
Aside: the wepoll mentioned in this repo is a standalone project extracted libuv, for projects that only desire to support Berkeley sockets and don’t care about other events sources (processes or pipes)