1 files changed, 126 insertions, 0 deletions
diff --git a/vendor/spin/benches/mutex.rs b/vendor/spin/benches/mutex.rs
new file mode 100644
index 0000000..83897bb
--- /dev/null
+++ b/vendor/spin/benches/mutex.rs
@@ -0,0 +1,126 @@
+#[macro_use]
+extern crate criterion;
+
+use criterion::{Criterion, Bencher, black_box};
+use std::{
+    ops::DerefMut,
+    sync::Arc,
+};
+
+trait Mutex<T>: Send + Sync + 'static {
+    type Guard<'a>: DerefMut<Target = T> where Self: 'a;
+    fn new(x: T) -> Self;
+    fn lock(&self) -> Self::Guard<'_>;
+}
+
+impl<T: Send + 'static> Mutex<T> for spin::mutex::SpinMutex<T> {
+    type Guard<'a> = spin::mutex::SpinMutexGuard<'a, T> where Self: 'a;
+    fn new(x: T) -> Self { spin::mutex::SpinMutex::new(x) }
+    fn lock(&self) -> Self::Guard<'_> { self.lock() }
+}
+
+impl<T: Send + 'static> Mutex<T> for spin::mutex::TicketMutex<T> {
+    type Guard<'a> = spin::mutex::TicketMutexGuard<'a, T> where Self: 'a;
+    fn new(x: T) -> Self { spin::mutex::TicketMutex::new(x) }
+    fn lock(&self) -> Self::Guard<'_> { self.lock() }
+}
+
+impl<T: Send + 'static> Mutex<T> for std::sync::Mutex<T> {
+    type Guard<'a> = std::sync::MutexGuard<'a, T> where Self: 'a;
+    fn new(x: T) -> Self { std::sync::Mutex::new(x) }
+    fn lock(&self) -> Self::Guard<'_> { self.lock().unwrap() }
+}
+
+fn gen_create<M: Mutex<u32>>(b: &mut Bencher) {
+    b.iter(|| {
+        let n = black_box(42);
+        M::new(n)
+    });
+}
+
+fn gen_lock_unlock<M: Mutex<u32>>(b: &mut Bencher) {
+    let m = M::new(0);
+    b.iter(|| {
+        let mut m = m.lock();
+        *m = m.wrapping_add(1);
+        drop(m);
+    });
+}
+
+fn gen_lock_unlock_read_contention<M: Mutex<u32>>(b: &mut Bencher) {
+    let m = Arc::new(M::new(0));
+    let thread = std::thread::spawn({
+        let m = m.clone();
+        move || {
+            while Arc::strong_count(&m) > 1 {
+                for _ in 0..1000 {
+                    black_box(*m.lock());
+                }
+            }
+        }
+    });
+    b.iter(|| {
+        let mut m = m.lock();
+        *m = m.wrapping_add(1);
+        drop(m);
+    });
+    drop(m);
+    thread.join().unwrap();
+}
+
+fn gen_lock_unlock_write_contention<M: Mutex<u32>>(b: &mut Bencher) {
+    let m = Arc::new(M::new(0));
+    let thread = std::thread::spawn({
+        let m = m.clone();
+        move || {
+            while Arc::strong_count(&m) > 1 {
+                for _ in 0..1000 {
+                    let mut m = m.lock();
+                    *m = m.wrapping_add(1);
+                    drop(m);
+                }
+            }
+        }
+    });
+    b.iter(|| {
+        let mut m = m.lock();
+        *m = m.wrapping_add(1);
+        drop(m);
+    });
+    drop(m);
+    thread.join().unwrap();
+}
+
+fn create(b: &mut Criterion) {
+    b.bench_function("create-spin-spinmutex", |b| gen_create::<spin::mutex::SpinMutex<u32>>(b));
+    b.bench_function("create-spin-ticketmutex", |b| gen_create::<spin::mutex::TicketMutex<u32>>(b));
+    b.bench_function("create-std", |b| gen_create::<std::sync::Mutex<u32>>(b));
+}
+
+fn lock_unlock(b: &mut Criterion) {
+    b.bench_function("lock_unlock-spin-spinmutex", |b| gen_lock_unlock::<spin::mutex::SpinMutex<u32>>(b));
+    b.bench_function("lock_unlock-spin-ticketmutex", |b| gen_lock_unlock::<spin::mutex::TicketMutex<u32>>(b));
+    b.bench_function("lock_unlock-std", |b| gen_lock_unlock::<std::sync::Mutex<u32>>(b));
+}
+
+fn lock_unlock_read_contention(b: &mut Criterion) {
+    b.bench_function("lock_unlock_read_contention-spin-spinmutex", |b| gen_lock_unlock_read_contention::<spin::mutex::SpinMutex<u32>>(b));
+    b.bench_function("lock_unlock_read_contention-spin-ticketmutex", |b| gen_lock_unlock_read_contention::<spin::mutex::TicketMutex<u32>>(b));
+    b.bench_function("lock_unlock_read_contention-std", |b| gen_lock_unlock_read_contention::<std::sync::Mutex<u32>>(b));
+}
+
+fn lock_unlock_write_contention(b: &mut Criterion) {
+    b.bench_function("lock_unlock_write_contention-spin-spinmutex", |b| gen_lock_unlock_write_contention::<spin::mutex::SpinMutex<u32>>(b));
+    b.bench_function("lock_unlock_write_contention-spin-ticketmutex", |b| gen_lock_unlock_write_contention::<spin::mutex::TicketMutex<u32>>(b));
+    b.bench_function("lock_unlock_write_contention-std", |b| gen_lock_unlock_write_contention::<std::sync::Mutex<u32>>(b));
+}
+
+criterion_group!(
+    mutex,
+    create,
+    lock_unlock,
+    lock_unlock_read_contention,
+    lock_unlock_write_contention,
+);
+
+criterion_main!(mutex);