Migrate threadpool to futures-util (#1403)

* Migrate threadpool to futures-util

Signed-off-by: Lucio Franco <[email protected]>

* fmt

tokio-threadpool/src/task/mod.rs

@@ -8,6 +8,7 @@ use self::state::State;
 use crate::pool::Pool;
 use crate::waker::Waker;
 
+use futures_util::task::ArcWake;
 use log::trace;
 use std::cell::{Cell, UnsafeCell};
 use std::future::Future;
@@ -134,7 +135,7 @@ impl Task {
 
             let mut g = Guard(fut, true);
 
-            let waker = arc_waker::waker(Arc::new(Waker {
+            let waker = ArcWake::into_waker(Arc::new(Waker {
                 task: me.clone(),
                 pool: pool.clone(),
             }));

tokio-threadpool/src/waker.rs

@@ -1,7 +1,7 @@
 use crate::pool::Pool;
 use crate::task::Task;
 
-use arc_waker::Wake;
+use futures_util::task::ArcWake;
 use std::sync::Arc;
 
 /// Implements the future `Waker` API.
@@ -17,7 +17,7 @@ pub(crate) struct Waker {
 unsafe impl Send for Waker {}
 unsafe impl Sync for Waker {}
 
-impl Wake for Waker {
+impl ArcWake for Waker {
     fn wake_by_ref(me: &Arc<Self>) {
         Task::schedule(&me.task, &me.pool);
     }