task: stabilize task ids (#6793)

Co-authored-by: Alice Ryhl <aliceryhl@google.com>

tokio/src/runtime/task/abort.rs

@@ -68,14 +68,7 @@ impl AbortHandle {
     /// Returns a [task ID] that uniquely identifies this task relative to other
     /// currently spawned tasks.
     ///
-    /// **Note**: This is an [unstable API][unstable]. The public API of this type
-    /// may break in 1.x releases. See [the documentation on unstable
-    /// features][unstable] for details.
-    ///
     /// [task ID]: crate::task::Id
-    /// [unstable]: crate#unstable-features
-    #[cfg(tokio_unstable)]
-    #[cfg_attr(docsrs, doc(cfg(tokio_unstable)))]
     pub fn id(&self) -> super::Id {
         // Safety: The header pointer is valid.
         unsafe { Header::get_id(self.raw.header_ptr()) }

tokio/src/runtime/task/id.rs

@@ -15,14 +15,7 @@ use std::{fmt, num::NonZeroU64};
 ///   task via the [`task::try_id()`](crate::task::try_id()) and
 ///   [`task::id()`](crate::task::id()) functions and from outside the task via
 ///   the [`JoinHandle::id()`](crate::task::JoinHandle::id()) function.
-///
-/// **Note**: This is an [unstable API][unstable]. The public API of this type
-/// may break in 1.x releases. See [the documentation on unstable
-/// features][unstable] for details.
-///
-/// [unstable]: crate#unstable-features
-#[cfg_attr(docsrs, doc(cfg(all(feature = "rt", tokio_unstable))))]
-#[cfg_attr(not(tokio_unstable), allow(unreachable_pub))]
+#[cfg_attr(docsrs, doc(cfg(all(feature = "rt"))))]
 #[derive(Clone, Copy, Debug, Hash, Eq, PartialEq)]
 pub struct Id(pub(crate) NonZeroU64);
 
@@ -35,13 +28,7 @@ pub struct Id(pub(crate) NonZeroU64);
 /// within a call to `block_on`. For a version of this function that doesn't
 /// panic, see [`task::try_id()`](crate::runtime::task::try_id()).
 ///
-/// **Note**: This is an [unstable API][unstable]. The public API of this type
-/// may break in 1.x releases. See [the documentation on unstable
-/// features][unstable] for details.
-///
 /// [task ID]: crate::task::Id
-/// [unstable]: crate#unstable-features
-#[cfg_attr(not(tokio_unstable), allow(unreachable_pub))]
 #[track_caller]
 pub fn id() -> Id {
     context::current_task_id().expect("Can't get a task id when not inside a task")
@@ -54,13 +41,7 @@ pub fn id() -> Id {
 /// that it returns `None` rather than panicking if called outside of a task
 /// context.
 ///
-/// **Note**: This is an [unstable API][unstable]. The public API of this type
-/// may break in 1.x releases. See [the documentation on unstable
-/// features][unstable] for details.
-///
 /// [task ID]: crate::task::Id
-/// [unstable]: crate#unstable-features
-#[cfg_attr(not(tokio_unstable), allow(unreachable_pub))]
 #[track_caller]
 pub fn try_id() -> Option<Id> {
     context::current_task_id()

tokio/src/runtime/task/join.rs

@@ -305,14 +305,7 @@ impl<T> JoinHandle<T> {
     /// Returns a [task ID] that uniquely identifies this task relative to other
     /// currently spawned tasks.
     ///
-    /// **Note**: This is an [unstable API][unstable]. The public API of this type
-    /// may break in 1.x releases. See [the documentation on unstable
-    /// features][unstable] for details.
-    ///
     /// [task ID]: crate::task::Id
-    /// [unstable]: crate#unstable-features
-    #[cfg(tokio_unstable)]
-    #[cfg_attr(docsrs, doc(cfg(tokio_unstable)))]
     pub fn id(&self) -> super::Id {
         // Safety: The header pointer is valid.
         unsafe { Header::get_id(self.raw.header_ptr()) }

tokio/src/task/mod.rs

@@ -359,9 +359,7 @@ cfg_rt! {
     #[cfg(tokio_unstable)]
     pub mod join_set;
 
-    cfg_unstable! {
-        pub use crate::runtime::task::{Id, id, try_id};
-    }
+    pub use crate::runtime::task::{Id, id, try_id};
 
     cfg_trace! {
         mod builder;

tokio/tests/task_id.rs

@@ -1,22 +1,18 @@
 #![allow(unknown_lints, unexpected_cfgs)]
 #![warn(rust_2018_idioms)]
-#![cfg(all(feature = "full", tokio_unstable))]
+#![cfg(feature = "full")]
 
-#[cfg(not(target_os = "wasi"))]
 use std::error::Error;
 use std::future::Future;
 use std::pin::Pin;
 use std::task::{Context, Poll};
-#[cfg(not(target_os = "wasi"))]
-use tokio::runtime::{Builder, Runtime};
+use tokio::runtime::Runtime;
 use tokio::sync::oneshot;
 use tokio::task::{self, Id, LocalSet};
 
-#[cfg(not(target_os = "wasi"))]
 mod support {
     pub mod panic;
 }
-#[cfg(not(target_os = "wasi"))]
 use support::panic::test_panic;
 
 #[tokio::test(flavor = "current_thread")]
@@ -256,6 +252,8 @@ async fn task_id_nested_spawn_local() {
 #[cfg(not(target_os = "wasi"))]
 #[tokio::test(flavor = "multi_thread")]
 async fn task_id_block_in_place_block_on_spawn() {
+    use tokio::runtime::Builder;
+
     task::spawn(async {
         let parent_id = task::id();
 
@@ -273,8 +271,8 @@ async fn task_id_block_in_place_block_on_spawn() {
     .unwrap();
 }
 
-#[cfg(not(target_os = "wasi"))]
 #[test]
+#[cfg_attr(not(panic = "unwind"), ignore)]
 fn task_id_outside_task_panic_caller() -> Result<(), Box<dyn Error>> {
     let panic_location_file = test_panic(|| {
         let _ = task::id();
@@ -286,8 +284,8 @@ fn task_id_outside_task_panic_caller() -> Result<(), Box<dyn Error>> {
     Ok(())
 }
 
-#[cfg(not(target_os = "wasi"))]
 #[test]
+#[cfg_attr(not(panic = "unwind"), ignore)]
 fn task_id_inside_block_on_panic_caller() -> Result<(), Box<dyn Error>> {
     let panic_location_file = test_panic(|| {
         let rt = Runtime::new().unwrap();