diff --git a/Cargo.toml b/Cargo.toml
index e920739..26e8421 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -59,7 +59,7 @@ crossbeam-deque = { version = "0.7.1", optional = true }
 crossbeam-utils = { version = "0.6.6", optional = true }
 futures-core = { version = "0.3.0", optional = true }
 futures-io = { version = "0.3.0", optional = true }
-futures-timer = { version = "1.0.2", optional = true }
+futures-timer = { version = "2.0.0", optional = true }
 kv-log-macro = { version = "1.0.4", optional = true }
 log = { version = "0.4.8", features = ["kv_unstable"], optional = true }
 memchr = { version = "2.2.1", optional = true }
@@ -73,10 +73,11 @@ slab = { version = "0.4.2", optional = true }
 
 [dev-dependencies]
 femme = "1.2.0"
+futures = "0.3.0"
+parking_lot = "0.9.0"
 rand = "0.7.2"
 surf = "1.0.3"
 tempdir = "0.3.7"
-futures = "0.3.0"
 
 [[test]]
 name = "stream"
diff --git a/benches/mutex.rs b/benches/mutex.rs
index 4f1910a..8ef66a6 100644
--- a/benches/mutex.rs
+++ b/benches/mutex.rs
@@ -1,40 +1,125 @@
 #![feature(test)]
 
-extern crate test;
+mod async_std {
+    extern crate test;
 
-use async_std::sync::{Arc, Mutex};
-use async_std::task;
-use test::Bencher;
+    use async_std::sync::{Arc, Mutex};
+    use async_std::task;
+    use test::Bencher;
 
-#[bench]
-fn create(b: &mut Bencher) {
-    b.iter(|| Mutex::new(()));
-}
+    #[bench]
+    fn create(b: &mut Bencher) {
+        b.iter(|| Mutex::new(()));
+    }
 
-#[bench]
-fn contention(b: &mut Bencher) {
-    b.iter(|| task::block_on(run(10, 1000)));
-}
+    #[bench]
+    fn contention(b: &mut Bencher) {
+        b.iter(|| task::block_on(run(10, 1000)));
+    }
+
+    #[bench]
+    fn no_contention(b: &mut Bencher) {
+        b.iter(|| task::block_on(run(1, 10000)));
+    }
+
+    async fn run(task: usize, iter: usize) {
+        let m = Arc::new(Mutex::new(()));
+        let mut tasks = Vec::new();
+
+        for _ in 0..task {
+            let m = m.clone();
+            tasks.push(task::spawn(async move {
+                for _ in 0..iter {
+                    let _ = m.lock().await;
+                }
+            }));
+        }
 
-#[bench]
-fn no_contention(b: &mut Bencher) {
-    b.iter(|| task::block_on(run(1, 10000)));
+        for t in tasks {
+            t.await;
+        }
+    }
 }
 
-async fn run(task: usize, iter: usize) {
-    let m = Arc::new(Mutex::new(()));
-    let mut tasks = Vec::new();
+ mod std {
+    extern crate test;
+
+    use std::sync::{Arc, Mutex};
+    use std::thread;
+    use test::Bencher;
 
-    for _ in 0..task {
-        let m = m.clone();
-        tasks.push(task::spawn(async move {
-            for _ in 0..iter {
-                let _ = m.lock().await;
-            }
-        }));
+    #[bench]
+    fn create(b: &mut Bencher) {
+        b.iter(|| Mutex::new(()));
     }
 
-    for t in tasks {
-        t.await;
+    #[bench]
+    fn contention(b: &mut Bencher) {
+        b.iter(|| run(10, 1000));
     }
-}
+
+    #[bench]
+    fn no_contention(b: &mut Bencher) {
+        b.iter(|| run(1, 10000));
+    }
+
+    fn run(thread: usize, iter: usize) {
+        let m = Arc::new(Mutex::new(()));
+        let mut threads = Vec::new();
+
+        for _ in 0..thread {
+            let m = m.clone();
+            threads.push(thread::spawn(move || {
+                for _ in 0..iter {
+                    let _ = m.lock().unwrap();
+                }
+            }));
+        }
+
+        for t in threads {
+            t.join().unwrap();
+        }
+    }
+ }
+
+ mod parking_lot {
+    extern crate test;
+
+    use std::sync::Arc;
+    use parking_lot::Mutex;
+    use std::thread;
+    use test::Bencher;
+
+    #[bench]
+    fn create(b: &mut Bencher) {
+        b.iter(|| Mutex::new(()));
+    }
+
+    #[bench]
+    fn contention(b: &mut Bencher) {
+        b.iter(|| run(10, 1000));
+    }
+
+    #[bench]
+    fn no_contention(b: &mut Bencher) {
+        b.iter(|| run(1, 10000));
+    }
+
+    fn run(thread: usize, iter: usize) {
+        let m = Arc::new(Mutex::new(()));
+        let mut threads = Vec::new();
+
+        for _ in 0..thread {
+            let m = m.clone();
+            threads.push(thread::spawn(move || {
+                for _ in 0..iter {
+                    let _ = m.lock();
+                }
+            }));
+        }
+
+        for t in threads {
+            t.join().unwrap();
+        }
+    }
+ }