1 files changed, 37 insertions, 0 deletions
diff --git a/third_party/rust/mio/src/sys/windows/overlapped.rs b/third_party/rust/mio/src/sys/windows/overlapped.rs
new file mode 100644
index 0000000000..837b78b60a
--- /dev/null
+++ b/third_party/rust/mio/src/sys/windows/overlapped.rs
@@ -0,0 +1,37 @@
+use crate::sys::windows::Event;
+
+use std::cell::UnsafeCell;
+use std::fmt;
+
+#[cfg(feature = "os-ext")]
+use winapi::um::minwinbase::OVERLAPPED;
+use winapi::um::minwinbase::OVERLAPPED_ENTRY;
+
+#[repr(C)]
+pub(crate) struct Overlapped {
+    inner: UnsafeCell<miow::Overlapped>,
+    pub(crate) callback: fn(&OVERLAPPED_ENTRY, Option<&mut Vec<Event>>),
+}
+
+#[cfg(feature = "os-ext")]
+impl Overlapped {
+    pub(crate) fn new(cb: fn(&OVERLAPPED_ENTRY, Option<&mut Vec<Event>>)) -> Overlapped {
+        Overlapped {
+            inner: UnsafeCell::new(miow::Overlapped::zero()),
+            callback: cb,
+        }
+    }
+
+    pub(crate) fn as_ptr(&self) -> *const OVERLAPPED {
+        unsafe { (*self.inner.get()).raw() }
+    }
+}
+
+impl fmt::Debug for Overlapped {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        f.debug_struct("Overlapped").finish()
+    }
+}
+
+unsafe impl Send for Overlapped {}
+unsafe impl Sync for Overlapped {}