1 files changed, 33 insertions, 0 deletions
diff --git a/third_party/rust/mio-extras/src/lib.rs b/third_party/rust/mio-extras/src/lib.rs
new file mode 100644
index 0000000000..69a000556c
--- /dev/null
+++ b/third_party/rust/mio-extras/src/lib.rs
@@ -0,0 +1,33 @@
+//! Extra components for use with Mio.
+#![deny(missing_docs)]
+extern crate lazycell;
+extern crate mio;
+extern crate slab;
+
+#[macro_use]
+extern crate log;
+
+pub mod channel;
+pub mod timer;
+
+// Conversion utilities
+mod convert {
+    use std::time::Duration;
+
+    const NANOS_PER_MILLI: u32 = 1_000_000;
+    const MILLIS_PER_SEC: u64 = 1_000;
+
+    /// Convert a `Duration` to milliseconds, rounding up and saturating at
+    /// `u64::MAX`.
+    ///
+    /// The saturating is fine because `u64::MAX` milliseconds are still many
+    /// million years.
+    pub fn millis(duration: Duration) -> u64 {
+        // Round up.
+        let millis = (duration.subsec_nanos() + NANOS_PER_MILLI - 1) / NANOS_PER_MILLI;
+        duration
+            .as_secs()
+            .saturating_mul(MILLIS_PER_SEC)
+            .saturating_add(u64::from(millis))
+    }
+}