refactor: switch to async-mutex for Mutex implementation

Cargo.toml

@@ -48,6 +48,7 @@ std = [
   "slab",
   "wasm-bindgen-futures",
   "futures-channel",
+  "async-mutex",
 ]
 alloc = [
   "futures-core/alloc",
@@ -58,6 +59,7 @@ tokio02 = ["smol/tokio02"]
 [dependencies]
 async-attributes = { version = "1.1.1", optional = true }
 async-task = { version = "3.0.0", optional = true }
+async-mutex = { version = "1.1.3", optional = true }
 crossbeam-utils = { version = "0.7.2", optional = true }
 futures-core = { version = "0.3.4", optional = true, default-features = false }
 futures-io = { version = "0.3.4", optional = true }
@@ -75,7 +77,7 @@ futures-timer = { version = "3.0.2", optional = true }
 surf = { version = "1.0.3", optional = true }
 
 [target.'cfg(not(target_os = "unknown"))'.dependencies]
-smol = { version = "0.1.14", optional = true }
+smol = { version = "0.1.17", optional = true }
 
 [target.'cfg(target_arch = "wasm32")'.dependencies]
 futures-timer = { version = "3.0.2", optional = true, features = ["wasm-bindgen"] }

src/sync/condvar.rs

@@ -2,7 +2,7 @@ use std::fmt;
 use std::pin::Pin;
 use std::time::Duration;
 
-use super::mutex::{guard_lock, MutexGuard};
+use super::MutexGuard;
 use crate::future::{timeout, Future};
 use crate::sync::WakerSet;
 use crate::task::{Context, Poll};
@@ -120,7 +120,7 @@ impl Condvar {
     /// ```
     #[allow(clippy::needless_lifetimes)]
     pub async fn wait<'a, T>(&self, guard: MutexGuard<'a, T>) -> MutexGuard<'a, T> {
-        let mutex = guard_lock(&guard);
+        let mutex = MutexGuard::source(&guard);
 
         self.await_notify(guard).await;
 
@@ -228,7 +228,7 @@ impl Condvar {
         guard: MutexGuard<'a, T>,
         dur: Duration,
     ) -> (MutexGuard<'a, T>, WaitTimeoutResult) {
-        let mutex = guard_lock(&guard);
+        let mutex = MutexGuard::source(&guard);
         match timeout(dur, self.wait(guard)).await {
             Ok(guard) => (guard, WaitTimeoutResult(false)),
             Err(_) => (mutex.lock().await, WaitTimeoutResult(true)),
@@ -281,7 +281,7 @@ impl Condvar {
     where
         F: FnMut(&mut T) -> bool,
     {
-        let mutex = guard_lock(&guard);
+        let mutex = MutexGuard::source(&guard);
         match timeout(dur, self.wait_until(guard, condition)).await {
             Ok(guard) => (guard, WaitTimeoutResult(false)),
             Err(_) => (mutex.lock().await, WaitTimeoutResult(true)),

src/sync/mod.rs

@@ -176,10 +176,11 @@
 #[doc(inline)]
 pub use std::sync::{Arc, Weak};
 
-pub use mutex::{Mutex, MutexGuard};
+#[doc(inline)]
+pub use async_mutex::{Mutex, MutexGuard};
+
 pub use rwlock::{RwLock, RwLockReadGuard, RwLockWriteGuard};
 
-mod mutex;
 mod rwlock;
 
 cfg_unstable! {