Merge pull request #214 from alexcrichton/futures-next

Update tokio-core with new task system

4 files changed, 52 insertions, 25 deletions

diff --git a/Cargo.toml b/Cargo.toml
index a0ad744f..368098d9 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -24,7 +24,7 @@ scoped-tls = "0.1.0"
 slab = "0.3"
 iovec = "0.1"
 tokio-io = "0.1"
-futures = "0.1.11"
+futures = "0.1.14"
 
 [dev-dependencies]
 env_logger = { version = "0.3", default-features = false }
diff --git a/src/reactor/io_token.rs b/src/reactor/io_token.rs
index e8c4880b..8b3cac9d 100644
--- a/src/reactor/io_token.rs
+++ b/src/reactor/io_token.rs
@@ -83,7 +83,7 @@ impl IoToken {
     /// This function will also panic if there is not a currently running future
     /// task.
     pub fn schedule_read(&self, handle: &Remote) {
-        handle.send(Message::Schedule(self.token, task::park(), Direction::Read));
+        handle.send(Message::Schedule(self.token, task::current(), Direction::Read));
     }
 
     /// Schedule the current future task to receive a notification when the
@@ -110,7 +110,7 @@ impl IoToken {
     /// This function will also panic if there is not a currently running future
     /// task.
     pub fn schedule_write(&self, handle: &Remote) {
-        handle.send(Message::Schedule(self.token, task::park(), Direction::Write));
+        handle.send(Message::Schedule(self.token, task::current(), Direction::Write));
     }
 
     /// Unregister all information associated with a token on an event loop,
diff --git a/src/reactor/mod.rs b/src/reactor/mod.rs
index e2b50958..52eb4c7a 100644
--- a/src/reactor/mod.rs
+++ b/src/reactor/mod.rs
@@ -15,8 +15,8 @@ use std::sync::atomic::{AtomicUsize, ATOMIC_USIZE_INIT, Ordering};
 use std::time::{Instant, Duration};
 
 use futures::{Future, IntoFuture, Async};
-use futures::future;
-use futures::executor::{self, Spawn, Unpark};
+use futures::future::{self, Executor, ExecuteError};
+use futures::executor::{self, Spawn, Notify};
 use futures::sync::mpsc;
 use futures::task::Task;
 use mio;
@@ -116,7 +116,7 @@ struct ScheduledIo {
 struct ScheduledTask {
     _registration: mio::Registration,
     spawn: Option<Spawn<Box<Future<Item=(), Error=()>>>>,
-    wake: Arc<MySetReadiness>,
+    wake: Option<Arc<MySetReadiness>>,
 }
 
 enum TimeoutState {
@@ -160,7 +160,7 @@ impl Core {
                          mio::Ready::readable(),
                          mio::PollOpt::level()));
         let rx_readiness = Arc::new(MySetReadiness(channel_pair.1));
-        rx_readiness.unpark();
+        rx_readiness.notify(0);
 
         Ok(Core {
             events: mio::Events::with_capacity(1024),
@@ -227,13 +227,12 @@ impl Core {
         where F: Future,
     {
         let mut task = executor::spawn(f);
-        let ready = self.future_readiness.clone();
         let mut future_fired = true;
 
         loop {
             if future_fired {
                 let res = try!(CURRENT_LOOP.set(self, || {
-                    task.poll_future(ready.clone())
+                    task.poll_future_notify(&self.future_readiness, 0)
                 }));
                 if let Async::Ready(e) = res {
                     return Ok(e)
@@ -344,22 +343,25 @@ impl Core {
     fn dispatch_task(&mut self, token: usize) {
         let mut inner = self.inner.borrow_mut();
         let (task, wake) = match inner.task_dispatch.get_mut(token) {
-            Some(slot) => (slot.spawn.take(), slot.wake.clone()),
+            Some(slot) => (slot.spawn.take(), slot.wake.take()),
             None => return,
         };
-        wake.0.set_readiness(mio::Ready::empty()).unwrap();
-        let mut task = match task {
-            Some(task) => task,
-            None => return,
+        let (mut task, wake) = match (task, wake) {
+            (Some(task), Some(wake)) => (task, wake),
+            _ => return,
         };
+        wake.0.set_readiness(mio::Ready::empty()).unwrap();
         drop(inner);
-        let res = CURRENT_LOOP.set(self, || task.poll_future(wake));
+        let res = CURRENT_LOOP.set(self, || {
+            task.poll_future_notify(&wake, 0)
+        });
         let _task_to_drop;
         inner = self.inner.borrow_mut();
         match res {
             Ok(Async::NotReady) => {
                 assert!(inner.task_dispatch[token].spawn.is_none());
                 inner.task_dispatch[token].spawn = Some(task);
+                inner.task_dispatch[token].wake = Some(wake);
             }
             Ok(Async::Ready(())) |
             Err(()) => {
@@ -391,19 +393,18 @@ impl Core {
 
     /// Method used to notify a task handle.
     ///
-    /// Note that this should be used instead of `handle.unpark()` to ensure
+    /// Note that this should be used instead of `handle.notify()` to ensure
     /// that the `CURRENT_LOOP` variable is set appropriately.
     fn notify_handle(&self, handle: Task) {
         debug!("notifying a task handle");
-        CURRENT_LOOP.set(&self, || handle.unpark());
+        CURRENT_LOOP.set(&self, || handle.notify());
     }
 
     fn consume_queue(&self) {
         debug!("consuming notification queue");
         // TODO: can we do better than `.unwrap()` here?
-        let unpark = self.rx_readiness.clone();
         loop {
-            let msg = self.rx.borrow_mut().poll_stream(unpark.clone()).unwrap();
+            let msg = self.rx.borrow_mut().poll_stream_notify(&self.rx_readiness, 0).unwrap();
             match msg {
                 Async::Ready(Some(msg)) => self.notify(msg),
                 Async::NotReady |
@@ -443,6 +444,14 @@ impl Core {
     }
 }
 
+impl<F> Executor<F> for Core
+    where F: Future<Item = (), Error = ()> + 'static,
+{
+    fn execute(&self, future: F) -> Result<(), ExecuteError<F>> {
+        self.handle().execute(future)
+    }
+}
+
 impl fmt::Debug for Core {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         f.debug_struct("Core")
@@ -554,12 +563,12 @@ impl Inner {
                          mio::PollOpt::level())
             .expect("cannot fail future registration with mio");
         let unpark = Arc::new(MySetReadiness(pair.1));
-        let entry = entry.insert(ScheduledTask {
+        unpark.notify(0);
+        entry.insert(ScheduledTask {
             spawn: Some(executor::spawn(future)),
-            wake: unpark,
+            wake: Some(unpark),
             _registration: pair.0,
         });
-        entry.get().wake.clone().unpark();
     }
 }
 
@@ -656,6 +665,15 @@ impl Remote {
     }
 }
 
+impl<F> Executor<F> for Remote
+    where F: Future<Item = (), Error = ()> + Send + 'static,
+{
+    fn execute(&self, future: F) -> Result<(), ExecuteError<F>> {
+        self.spawn(|_| future);
+        Ok(())
+    }
+}
+
 impl fmt::Debug for Remote {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         f.debug_struct("Remote")
@@ -700,6 +718,15 @@ impl Handle {
     }
 }
 
+impl<F> Executor<F> for Handle
+    where F: Future<Item = (), Error = ()> + 'static,
+{
+    fn execute(&self, future: F) -> Result<(), ExecuteError<F>> {
+        self.spawn(future);
+        Ok(())
+    }
+}
+
 impl fmt::Debug for Handle {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         f.debug_struct("Handle")
@@ -729,8 +756,8 @@ impl TimeoutState {
 
 struct MySetReadiness(mio::SetReadiness);
 
-impl Unpark for MySetReadiness {
-    fn unpark(&self) {
+impl Notify for MySetReadiness {
+    fn notify(&self, _id: usize) {
         self.0.set_readiness(mio::Ready::readable())
               .expect("failed to set readiness");
     }
diff --git a/src/reactor/timeout_token.rs b/src/reactor/timeout_token.rs
index ca82bde2..5c086216 100644
--- a/src/reactor/timeout_token.rs
+++ b/src/reactor/timeout_token.rs
@@ -30,7 +30,7 @@ impl TimeoutToken {
     /// This method will panic if the timeout specified was not created by this
     /// loop handle's `add_timeout` method.
     pub fn update_timeout(&self, handle: &Remote) {
-        handle.send(Message::UpdateTimeout(self.token, task::park()))
+        handle.send(Message::UpdateTimeout(self.token, task::current()))
     }
 
     /// Resets previously added (or fired) timeout to an new timeout