1 files changed, 162 insertions, 0 deletions
diff --git a/third_party/rust/mio/src/sys/windows/event.rs b/third_party/rust/mio/src/sys/windows/event.rs
new file mode 100644
index 0000000000..a49252a296
--- /dev/null
+++ b/third_party/rust/mio/src/sys/windows/event.rs
@@ -0,0 +1,162 @@
+use std::fmt;
+
+use miow::iocp::CompletionStatus;
+
+use super::afd;
+use crate::Token;
+
+#[derive(Clone)]
+pub struct Event {
+    pub flags: u32,
+    pub data: u64,
+}
+
+pub fn token(event: &Event) -> Token {
+    Token(event.data as usize)
+}
+
+impl Event {
+    pub(super) fn new(token: Token) -> Event {
+        Event {
+            flags: 0,
+            data: usize::from(token) as u64,
+        }
+    }
+
+    pub(super) fn set_readable(&mut self) {
+        self.flags |= afd::POLL_RECEIVE
+    }
+
+    #[cfg(feature = "os-ext")]
+    pub(super) fn set_writable(&mut self) {
+        self.flags |= afd::POLL_SEND;
+    }
+
+    pub(super) fn from_completion_status(status: &CompletionStatus) -> Event {
+        Event {
+            flags: status.bytes_transferred(),
+            data: status.token() as u64,
+        }
+    }
+
+    pub(super) fn to_completion_status(&self) -> CompletionStatus {
+        CompletionStatus::new(self.flags, self.data as usize, std::ptr::null_mut())
+    }
+}
+
+pub(crate) const READABLE_FLAGS: u32 = afd::POLL_RECEIVE
+    | afd::POLL_DISCONNECT
+    | afd::POLL_ACCEPT
+    | afd::POLL_ABORT
+    | afd::POLL_CONNECT_FAIL;
+pub(crate) const WRITABLE_FLAGS: u32 = afd::POLL_SEND | afd::POLL_ABORT | afd::POLL_CONNECT_FAIL;
+pub(crate) const ERROR_FLAGS: u32 = afd::POLL_CONNECT_FAIL;
+pub(crate) const READ_CLOSED_FLAGS: u32 =
+    afd::POLL_DISCONNECT | afd::POLL_ABORT | afd::POLL_CONNECT_FAIL;
+pub(crate) const WRITE_CLOSED_FLAGS: u32 = afd::POLL_ABORT | afd::POLL_CONNECT_FAIL;
+
+pub fn is_readable(event: &Event) -> bool {
+    event.flags & READABLE_FLAGS != 0
+}
+
+pub fn is_writable(event: &Event) -> bool {
+    event.flags & WRITABLE_FLAGS != 0
+}
+
+pub fn is_error(event: &Event) -> bool {
+    event.flags & ERROR_FLAGS != 0
+}
+
+pub fn is_read_closed(event: &Event) -> bool {
+    event.flags & READ_CLOSED_FLAGS != 0
+}
+
+pub fn is_write_closed(event: &Event) -> bool {
+    event.flags & WRITE_CLOSED_FLAGS != 0
+}
+
+pub fn is_priority(event: &Event) -> bool {
+    event.flags & afd::POLL_RECEIVE_EXPEDITED != 0
+}
+
+pub fn is_aio(_: &Event) -> bool {
+    // Not supported.
+    false
+}
+
+pub fn is_lio(_: &Event) -> bool {
+    // Not supported.
+    false
+}
+
+pub fn debug_details(f: &mut fmt::Formatter<'_>, event: &Event) -> fmt::Result {
+    #[allow(clippy::trivially_copy_pass_by_ref)]
+    fn check_flags(got: &u32, want: &u32) -> bool {
+        (got & want) != 0
+    }
+    debug_detail!(
+        FlagsDetails(u32),
+        check_flags,
+        afd::POLL_RECEIVE,
+        afd::POLL_RECEIVE_EXPEDITED,
+        afd::POLL_SEND,
+        afd::POLL_DISCONNECT,
+        afd::POLL_ABORT,
+        afd::POLL_LOCAL_CLOSE,
+        afd::POLL_CONNECT,
+        afd::POLL_ACCEPT,
+        afd::POLL_CONNECT_FAIL,
+    );
+
+    f.debug_struct("event")
+        .field("flags", &FlagsDetails(event.flags))
+        .field("data", &event.data)
+        .finish()
+}
+
+pub struct Events {
+    /// Raw I/O event completions are filled in here by the call to `get_many`
+    /// on the completion port above. These are then processed to run callbacks
+    /// which figure out what to do after the event is done.
+    pub statuses: Box<[CompletionStatus]>,
+
+    /// Literal events returned by `get` to the upwards `EventLoop`. This file
+    /// doesn't really modify this (except for the waker), instead almost all
+    /// events are filled in by the `ReadinessQueue` from the `poll` module.
+    pub events: Vec<Event>,
+}
+
+impl Events {
+    pub fn with_capacity(cap: usize) -> Events {
+        // Note that it's possible for the output `events` to grow beyond the
+        // capacity as it can also include deferred events, but that's certainly
+        // not the end of the world!
+        Events {
+            statuses: vec![CompletionStatus::zero(); cap].into_boxed_slice(),
+            events: Vec::with_capacity(cap),
+        }
+    }
+
+    pub fn is_empty(&self) -> bool {
+        self.events.is_empty()
+    }
+
+    pub fn capacity(&self) -> usize {
+        self.events.capacity()
+    }
+
+    pub fn len(&self) -> usize {
+        self.events.len()
+    }
+
+    pub fn get(&self, idx: usize) -> Option<&Event> {
+        self.events.get(idx)
+    }
+
+    pub fn clear(&mut self) {
+        self.events.clear();
+        for status in self.statuses.iter_mut() {
+            *status = CompletionStatus::zero();
+        }
+    }
+}