From da23d16019f4cf926349d9b45a2a6541db77733e Mon Sep 17 00:00:00 2001
From: k-nasa <htilcs1115@gmail.com>
Date: Tue, 4 Feb 2020 17:59:22 +0900
Subject: [PATCH 1/4] feat: to no_std future::pending

---
 src/future/pending.rs | 19 +++++++++++--------
 1 file changed, 11 insertions(+), 8 deletions(-)

diff --git a/src/future/pending.rs b/src/future/pending.rs
index 968972b51..f3a3379dc 100644
--- a/src/future/pending.rs
+++ b/src/future/pending.rs
@@ -1,6 +1,6 @@
-use std::future::Future;
-use std::marker::PhantomData;
-use std::pin::Pin;
+use core::future::Future;
+use core::marker::PhantomData;
+use core::pin::Pin;
 
 use crate::task::{Context, Poll};
 
@@ -24,14 +24,17 @@ use crate::task::{Context, Poll};
 /// #
 /// # })
 /// ```
-pub async fn pending<T>() -> T {
-    let fut = Pending {
+pub fn pending<T>() -> Pending<T> {
+    Pending {
         _marker: PhantomData,
-    };
-    fut.await
+    }
 }
 
-struct Pending<T> {
+/// This future is constructed by the [`pending`] function.
+///
+/// [`pending`]: fn.pending.html
+#[derive(Debug)]
+pub struct Pending<T> {
     _marker: PhantomData<T>,
 }
 

From 94a6ff34c2d49f74da21dd43187ed4f18efd84b7 Mon Sep 17 00:00:00 2001
From: k-nasa <htilcs1115@gmail.com>
Date: Tue, 4 Feb 2020 18:00:44 +0900
Subject: [PATCH 2/4] feat: no to_std future::poll_fn

---
 src/future/poll_fn.rs | 15 +++++++++------
 1 file changed, 9 insertions(+), 6 deletions(-)

diff --git a/src/future/poll_fn.rs b/src/future/poll_fn.rs
index 194526400..1524d27c3 100644
--- a/src/future/poll_fn.rs
+++ b/src/future/poll_fn.rs
@@ -1,5 +1,5 @@
-use std::pin::Pin;
-use std::future::Future;
+use core::future::Future;
+use core::pin::Pin;
 
 use crate::task::{Context, Poll};
 
@@ -23,15 +23,18 @@ use crate::task::{Context, Poll};
 /// #
 /// # })
 /// ```
-pub async fn poll_fn<F, T>(f: F) -> T
+pub fn poll_fn<F, T>(f: F) -> PollFn<F>
 where
     F: FnMut(&mut Context<'_>) -> Poll<T>,
 {
-    let fut = PollFn { f };
-    fut.await
+    PollFn { f }
 }
 
-struct PollFn<F> {
+/// This future is constructed by the [`poll_fn`] function.
+///
+/// [`poll_fn`]: fn.poll_fn.html
+#[derive(Debug)]
+pub struct PollFn<F> {
     f: F,
 }
 

From 3b9c7f095840d3d7409ea860d184cab9bd7352e4 Mon Sep 17 00:00:00 2001
From: k-nasa <htilcs1115@gmail.com>
Date: Tue, 4 Feb 2020 18:01:50 +0900
Subject: [PATCH 3/4] feat: to no_std future::ready

---
 src/future/ready.rs | 25 +++++++++++++++++++++++--
 1 file changed, 23 insertions(+), 2 deletions(-)

diff --git a/src/future/ready.rs b/src/future/ready.rs
index 65cba563d..0b7987362 100644
--- a/src/future/ready.rs
+++ b/src/future/ready.rs
@@ -1,3 +1,8 @@
+use core::future::Future;
+use core::pin::Pin;
+
+use crate::task::{Context, Poll};
+
 /// Resolves to the provided value.
 ///
 /// This function is an async version of [`std::convert::identity`].
@@ -15,6 +20,22 @@
 /// #
 /// # })
 /// ```
-pub async fn ready<T>(val: T) -> T {
-    val
+pub fn ready<T>(val: T) -> Ready<T> {
+    Ready(Some(val))
+}
+
+/// This future is constructed by the [`ready`] function.
+///
+/// [`ready`]: fn.ready.html
+#[derive(Debug)]
+pub struct Ready<T>(Option<T>);
+
+impl<T> Unpin for Ready<T> {}
+
+impl<T> Future for Ready<T> {
+    type Output = T;
+
+    fn poll(mut self: Pin<&mut Self>, _: &mut Context<'_>) -> Poll<T> {
+        Poll::Ready(self.0.take().unwrap())
+    }
 }

From 3883079fa586e77b8e31b2fb4c94ef852890350b Mon Sep 17 00:00:00 2001
From: k-nasa <htilcs1115@gmail.com>
Date: Tue, 4 Feb 2020 18:04:31 +0900
Subject: [PATCH 4/4] feat: to no_std future module

---
 src/future/mod.rs | 9 +++------
 1 file changed, 3 insertions(+), 6 deletions(-)

diff --git a/src/future/mod.rs b/src/future/mod.rs
index 9b75533d3..d918ef083 100644
--- a/src/future/mod.rs
+++ b/src/future/mod.rs
@@ -48,17 +48,14 @@
 
 cfg_alloc! {
     pub use future::Future;
-    pub(crate) mod future;
-}
-
-cfg_std! {
+    pub use ready::ready;
     pub use pending::pending;
     pub use poll_fn::poll_fn;
-    pub use ready::ready;
 
+    pub(crate) mod future;
+    mod ready;
     mod pending;
     mod poll_fn;
-    mod ready;
 }
 
 cfg_default! {

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