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-rw-r--r--xpcom/rust/gtest/moz_task/test.rs78
1 files changed, 78 insertions, 0 deletions
diff --git a/xpcom/rust/gtest/moz_task/test.rs b/xpcom/rust/gtest/moz_task/test.rs
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+++ b/xpcom/rust/gtest/moz_task/test.rs
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+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+use moz_task;
+use std::{
+ future::Future,
+ pin::Pin,
+ task::{Context, Poll, Waker},
+};
+
+/// Demo `Future` to demonstrate executing futures to completion via `nsIEventTarget`.
+struct MyFuture {
+ poll_count: u32,
+ waker: Option<Waker>,
+ expect_main_thread: bool,
+}
+
+impl MyFuture {
+ fn new(expect_main_thread: bool) -> Self {
+ Self {
+ poll_count: 0,
+ waker: None,
+ expect_main_thread,
+ }
+ }
+}
+
+impl Future for MyFuture {
+ type Output = u32;
+
+ fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<u32> {
+ assert_eq!(moz_task::is_main_thread(), self.expect_main_thread);
+
+ self.poll_count += 1;
+
+ if let Some(waker) = &mut self.waker {
+ if !waker.will_wake(cx.waker()) {
+ *waker = cx.waker().clone();
+ }
+ } else {
+ let waker = cx.waker().clone();
+ self.waker = Some(waker);
+ }
+
+ println!("Poll count = {}", self.poll_count);
+ if self.poll_count > 5 {
+ Poll::Ready(self.poll_count)
+ } else {
+ // Just notify the task that we need to re-polled.
+ if let Some(waker) = &self.waker {
+ waker.wake_by_ref();
+ }
+ Poll::Pending
+ }
+ }
+}
+
+#[no_mangle]
+pub extern "C" fn Rust_Future(it_worked: *mut bool) {
+ let future = async move {
+ assert_eq!(MyFuture::new(true).await, 6);
+ assert_eq!(
+ moz_task::spawn_local("Rust_Future inner spawn_local", MyFuture::new(true)).await,
+ 6
+ );
+ assert_eq!(
+ moz_task::spawn("Rust_Future inner spawn", MyFuture::new(false)).await,
+ 6
+ );
+ unsafe {
+ *it_worked = true;
+ }
+ };
+ unsafe {
+ moz_task::gtest_only::spin_event_loop_until("Rust_Future", future).unwrap();
+ };
+}