Add Mutex::unlock

library/std/src/sync/mutex.rs

@@ -219,6 +219,26 @@ impl<T> Mutex<T> {
  data: UnsafeCell::new(t),
  }
  }
+
+ /// Immediately drops the guard, and consequently unlocks the mutex.
+ ///
+ /// This function is equivalent to calling [`drop`] on the guard but is more self-documenting.
+ /// Alternately, the guard will be automatically dropped when it goes out of scope.
+ ///
+ /// ```
+ /// #![feature(mutex_unlock)]
+ ///
+ /// use std::sync::Mutex;
+ /// let mutex = Mutex::new(0);
+ ///
+ /// let mut guard = mutex.lock().unwrap();
+ /// *guard += 20;
+ /// Mutex::unlock(guard);
+ /// ```
+ #[unstable(feature = "mutex_unlock", issue = "81872")]
+ pub fn unlock(guard: MutexGuard<'_, T>) {
+ drop(guard);
+ }
 }
 
 impl<T: ?Sized> Mutex<T> {