回答編集履歴
2
コードの main() 関数内を修正して let now = enqueue(&sender, task).await の形にしました
test
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@@ -222,13 +222,15 @@
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let task = Task::new(|| Box::new(SystemTime::now()));
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// tokioの非同期ランタイムでasyncブロックを実行する
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rt.block_on(async {
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let
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let now = enqueue(&sender, task).await;
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let result = rt.block_on(future);
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println!("result has been received: {:?}",
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println!("result has been received: {:?}", now);
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});
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}
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実装例のコードを追加しました
test
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@@ -45,3 +45,223 @@
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そして上の例と同じように`poll()`メソッドを実装すれば完成です。
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**追記**
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ご提示のコードに上の内容を実装してみました。
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> `Future`を実装した型を定義して、`new()`で処理をジョブキューに投入します。
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このコードでは`TaskFuture`という型を定義しましたが、それの`new()`で処理（`Task`）をジョブキューに投入するのではなく、`enqueue()`関数内で行うようにしました。
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```rust
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// Cargo.tomlに以下を追加する
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// [dependencies]
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// tokio = { version = "0.3", features = ["rt", "rt-multi-thread"] }
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use std::{
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fmt::Debug,
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future::Future,
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pin::Pin,
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sync::mpsc::{channel, Receiver, Sender},
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sync::{Arc, Mutex},
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task::{Context, Poll, Waker},
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thread::{sleep, spawn},
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time::{Duration, SystemTime},
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};
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use tokio::runtime::Runtime;
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struct Task {
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exec: Box<dyn Send + FnMut() -> Box<dyn Debug + Send>>,
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shared_state: Arc<Mutex<SharedState>>,
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}
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impl Task {
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fn new<E>(exec: E) -> Self
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where
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E: Send + 'static + FnMut() -> Box<dyn Debug + Send>,
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{
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Self {
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exec: Box::new(exec),
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shared_state: Arc::new(Mutex::new(SharedState {
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result: None,
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waker: None,
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})),
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}
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}
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fn execute(&mut self) {
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let result = (self.exec)();
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println!("task has been executed with: {:?}", result);
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let mut shared_state = self.shared_state.lock().unwrap();
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shared_state.result = Some(result);
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if let Some(waker) = shared_state.waker.take() {
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waker.wake()
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}
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}
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}
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struct TaskFuture {
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shared_state: Arc<Mutex<SharedState>>,
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}
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impl Future for TaskFuture {
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type Output = Box<dyn Debug>;
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fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
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let mut shared_state = self.shared_state.lock().unwrap();
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if let Some(result) = shared_state.result.take() {
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Poll::Ready(result)
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} else {
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shared_state.waker = Some(cx.waker().clone());
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Poll::Pending
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}
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}
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}
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struct SharedState {
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result: Option<Box<dyn Debug + Send>>,
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waker: Option<Waker>,
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}
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fn main() {
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let (sender, receiver) = channel::<Task>();
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spawn(move || event_loop(receiver));
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let rt = Runtime::new().unwrap();
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loop {
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sleep(Duration::from_secs(1));
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let task = Task::new(|| Box::new(SystemTime::now()));
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let future = enqueue(&sender, task);
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226
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// 非同期ランタイムでfutureを実行する。実行が終わるまでブロックされる
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let result = rt.block_on(future);
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println!("result has been received: {:?}", result);
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}
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}
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fn enqueue(sender: &Sender<Task>, task: Task) -> TaskFuture {
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let future = TaskFuture {
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shared_state: Arc::clone(&task.shared_state),
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};
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sender.send(task).unwrap();
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future
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}
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fn event_loop(receiver: Receiver<Task>) {
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256
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loop {
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let mut task = receiver.recv().unwrap();
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task.execute();
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}
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}
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```
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