Suppress deprecated warnings for spin_loop_hint (#3497)

* Suppress deprecated warnings for spin_loop_hint * Update tokio/src/loom/std/mod.rs Co-authored-by: Taiki Endo <te316e89@gmail.com> * Update tokio/src/sync/task/atomic_waker.rs Co-authored-by: Taiki Endo <te316e89@gmail.com> * fmt Co-authored-by: Taiki Endo <te316e89@gmail.com>
tokio-rs · Feb 1, 2021 · cc97fb8 · cc97fb8
1 parent 60d8884
commit cc97fb8
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diff --git a/tokio/src/loom/std/mod.rs b/tokio/src/loom/std/mod.rs
@@ -74,7 +74,10 @@ pub(crate) mod sync {
         pub(crate) use crate::loom::std::atomic_u8::AtomicU8;
         pub(crate) use crate::loom::std::atomic_usize::AtomicUsize;
 
-        pub(crate) use std::sync::atomic::{fence, spin_loop_hint, AtomicBool, Ordering};
+        pub(crate) use std::sync::atomic::{fence, AtomicBool, Ordering};
+        // TODO: once we bump MSRV to 1.49+, use `hint::spin_loop` instead.
+        #[allow(deprecated)]
+        pub(crate) use std::sync::atomic::spin_loop_hint;
     }
 }
 

diff --git a/tokio/src/sync/task/atomic_waker.rs b/tokio/src/sync/task/atomic_waker.rs
@@ -223,6 +223,8 @@ impl AtomicWaker {
                 waker.wake();
 
                 // This is equivalent to a spin lock, so use a spin hint.
+                // TODO: once we bump MSRV to 1.49+, use `hint::spin_loop` instead.
+                #[allow(deprecated)]
                 atomic::spin_loop_hint();
             }
             state => {