1 files changed, 58 insertions, 0 deletions
diff --git a/tokio/src/io/driver/interest.rs b/tokio/src/io/driver/interest.rs
new file mode 100644
index 00000000..f9887e86
--- /dev/null
+++ b/tokio/src/io/driver/interest.rs
@@ -0,0 +1,58 @@
+use std::fmt;
+use std::ops;
+
+/// Readiness event interest
+///
+/// Specifies the readiness events the caller is interested in when awaiting on
+/// I/O resource readiness states.
+#[derive(Clone, Copy)]
+pub(crate) struct Interest(mio::Interest);
+
+impl Interest {
+    /// Interest in all readable events
+    pub(crate) const READABLE: Interest = Interest(mio::Interest::READABLE);
+
+    /// Interest in all writable events
+    pub(crate) const WRITABLE: Interest = Interest(mio::Interest::WRITABLE);
+
+    /// Returns true if the value includes readable interest.
+    pub(crate) const fn is_readable(self) -> bool {
+        self.0.is_readable()
+    }
+
+    /// Returns true if the value includes writable interest.
+    pub(crate) const fn is_writable(self) -> bool {
+        self.0.is_writable()
+    }
+
+    /// Add together two `Interst` values.
+    pub(crate) const fn add(self, other: Interest) -> Interest {
+        Interest(self.0.add(other.0))
+    }
+
+    pub(crate) const fn to_mio(self) -> mio::Interest {
+        self.0
+    }
+}
+
+impl ops::BitOr for Interest {
+    type Output = Self;
+
+    #[inline]
+    fn bitor(self, other: Self) -> Self {
+        self.add(other)
+    }
+}
+
+impl ops::BitOrAssign for Interest {
+    #[inline]
+    fn bitor_assign(&mut self, other: Self) {
+        self.0 = (*self | other).0;
+    }
+}
+
+impl fmt::Debug for Interest {
+    fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result {
+        self.0.fmt(fmt)
+    }
+}