mio/sys/unix/selector/
stateless_io_source.rs

1//! Both `kqueue(2)` and `epoll(2)` don't need to hold any user space state.
2
3use std::io;
4use std::os::fd::RawFd;
5
6use crate::{Interest, Registry, Token};
7
8pub(crate) struct IoSourceState;
9
10impl IoSourceState {
11    pub(crate) fn new() -> IoSourceState {
12        IoSourceState
13    }
14
15    pub(crate) fn do_io<T, F, R>(&self, f: F, io: &T) -> io::Result<R>
16    where
17        F: FnOnce(&T) -> io::Result<R>,
18    {
19        // We don't hold state, so we can just call the function and
20        // return.
21        f(io)
22    }
23
24    pub(crate) fn register(
25        &mut self,
26        registry: &Registry,
27        token: Token,
28        interests: Interest,
29        fd: RawFd,
30    ) -> io::Result<()> {
31        // Pass through, we don't have any state.
32        registry.selector().register(fd, token, interests)
33    }
34
35    pub(crate) fn reregister(
36        &mut self,
37        registry: &Registry,
38        token: Token,
39        interests: Interest,
40        fd: RawFd,
41    ) -> io::Result<()> {
42        // Pass through, we don't have any state.
43        registry.selector().reregister(fd, token, interests)
44    }
45
46    pub(crate) fn deregister(&mut self, registry: &Registry, fd: RawFd) -> io::Result<()> {
47        // Pass through, we don't have any state.
48        registry.selector().deregister(fd)
49    }
50}