Vendor dependencies for 0.3.0 release

vendor/crossbeam-epoch/benches/defer.rs

@@ -0,0 +1,69 @@
+#![feature(test)]
+
+extern crate test;
+
+use crossbeam_epoch::{self as epoch, Owned};
+use crossbeam_utils::thread::scope;
+use test::Bencher;
+
+#[bench]
+fn single_alloc_defer_free(b: &mut Bencher) {
+    b.iter(|| {
+        let guard = &epoch::pin();
+        let p = Owned::new(1).into_shared(guard);
+        unsafe {
+            guard.defer_destroy(p);
+        }
+    });
+}
+
+#[bench]
+fn single_defer(b: &mut Bencher) {
+    b.iter(|| {
+        let guard = &epoch::pin();
+        guard.defer(move || ());
+    });
+}
+
+#[bench]
+fn multi_alloc_defer_free(b: &mut Bencher) {
+    const THREADS: usize = 16;
+    const STEPS: usize = 10_000;
+
+    b.iter(|| {
+        scope(|s| {
+            for _ in 0..THREADS {
+                s.spawn(|_| {
+                    for _ in 0..STEPS {
+                        let guard = &epoch::pin();
+                        let p = Owned::new(1).into_shared(guard);
+                        unsafe {
+                            guard.defer_destroy(p);
+                        }
+                    }
+                });
+            }
+        })
+        .unwrap();
+    });
+}
+
+#[bench]
+fn multi_defer(b: &mut Bencher) {
+    const THREADS: usize = 16;
+    const STEPS: usize = 10_000;
+
+    b.iter(|| {
+        scope(|s| {
+            for _ in 0..THREADS {
+                s.spawn(|_| {
+                    for _ in 0..STEPS {
+                        let guard = &epoch::pin();
+                        guard.defer(move || ());
+                    }
+                });
+            }
+        })
+        .unwrap();
+    });
+}