1 files changed, 37 insertions, 0 deletions
diff --git a/third_party/rust/atomic_refcell/benches/basic.rs b/third_party/rust/atomic_refcell/benches/basic.rs
new file mode 100644
index 0000000000..3902a98a37
--- /dev/null
+++ b/third_party/rust/atomic_refcell/benches/basic.rs
@@ -0,0 +1,37 @@
+#![feature(test)]
+
+extern crate atomic_refcell;
+extern crate test;
+
+use atomic_refcell::AtomicRefCell;
+use test::Bencher;
+
+#[derive(Default)]
+struct Bar(u32);
+
+#[bench]
+fn immutable_borrow(b: &mut Bencher) {
+    let a = AtomicRefCell::new(Bar::default());
+    b.iter(|| a.borrow());
+}
+
+#[bench]
+fn immutable_second_borrow(b: &mut Bencher) {
+    let a = AtomicRefCell::new(Bar::default());
+    let _first = a.borrow();
+    b.iter(|| a.borrow());
+}
+
+#[bench]
+fn immutable_third_borrow(b: &mut Bencher) {
+    let a = AtomicRefCell::new(Bar::default());
+    let _first = a.borrow();
+    let _second = a.borrow();
+    b.iter(|| a.borrow());
+}
+
+#[bench]
+fn mutable_borrow(b: &mut Bencher) {
+    let a = AtomicRefCell::new(Bar::default());
+    b.iter(|| a.borrow_mut());
+}