Initial vendor packages

Signed-off-by: Valentin Popov <valentin@popov.link>

vendor/crossbeam-epoch/benches/defer.rs

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+#![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();
+    });
+}

vendor/crossbeam-epoch/benches/flush.rs

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+#![feature(test)]
+
+extern crate test;
+
+use std::sync::Barrier;
+
+use crossbeam_epoch as epoch;
+use crossbeam_utils::thread::scope;
+use test::Bencher;
+
+#[bench]
+fn single_flush(b: &mut Bencher) {
+    const THREADS: usize = 16;
+
+    let start = Barrier::new(THREADS + 1);
+    let end = Barrier::new(THREADS + 1);
+
+    scope(|s| {
+        for _ in 0..THREADS {
+            s.spawn(|_| {
+                epoch::pin();
+                start.wait();
+                end.wait();
+            });
+        }
+
+        start.wait();
+        b.iter(|| epoch::pin().flush());
+        end.wait();
+    })
+    .unwrap();
+}
+
+#[bench]
+fn multi_flush(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.flush();
+                    }
+                });
+            }
+        })
+        .unwrap();
+    });
+}

vendor/crossbeam-epoch/benches/pin.rs

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+#![feature(test)]
+
+extern crate test;
+
+use crossbeam_epoch as epoch;
+use crossbeam_utils::thread::scope;
+use test::Bencher;
+
+#[bench]
+fn single_pin(b: &mut Bencher) {
+    b.iter(epoch::pin);
+}
+
+#[bench]
+fn multi_pin(b: &mut Bencher) {
+    const THREADS: usize = 16;
+    const STEPS: usize = 100_000;
+
+    b.iter(|| {
+        scope(|s| {
+            for _ in 0..THREADS {
+                s.spawn(|_| {
+                    for _ in 0..STEPS {
+                        epoch::pin();
+                    }
+                });
+            }
+        })
+        .unwrap();
+    });
+}