15     /// A registration represents an I/O resource registered with a Reactor such
22     /// registration instance is dropped.
24     /// A registration instance represents two separate readiness streams. One
28     /// **Note**: while `Registration` is `Sync`, the caller must ensure that
29     /// there are at most two tasks that use a registration instance
37     /// `Registration` also allows receiving platform-specific `mio::Ready`
46     pub(crate) struct Registration {
55 unsafe impl Send for Registration {}  implementation
56 unsafe impl Sync for Registration {}  implementation
58 // ===== impl Registration =====
60 impl Registration {  impl
68     /// - `Ok` if the registration happened successfully
69     /// - `Err` if an error was encountered during registration
75     ) -> io::Result<Registration> {  in new_with_interest_and_handle()  argument
78         Ok(Registration { handle, shared })  in new_with_interest_and_handle()
84     /// registration is dropped.
94     /// no longer result in notifications getting sent for this registration.
206 impl Drop for Registration {  implementation
211         // possible to store a `Registration` in a waker. In this case, the  in drop()
227     impl Registration {  impl