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Subject[PATCH v1 7/7] rust: workqueue: add `try_spawn` helper method
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This adds a convenience method that lets you spawn a closure for
execution on a workqueue. This will be the most convenient way to use
workqueues, but it is fallible because it needs to allocate memory.

Signed-off-by: Alice Ryhl <aliceryhl@google.com>
---
rust/kernel/workqueue.rs | 40 ++++++++++++++++++++++++++++++++++++++++
1 file changed, 40 insertions(+)

diff --git a/rust/kernel/workqueue.rs b/rust/kernel/workqueue.rs
index 007005ddcaf0..303b72efd95f 100644
--- a/rust/kernel/workqueue.rs
+++ b/rust/kernel/workqueue.rs
@@ -57,6 +57,42 @@ impl Queue {
})
}
}
+
+ /// Tries to spawn the given function or closure as a work item.
+ ///
+ /// This method can fail because it allocates memory to store the work item.
+ pub fn try_spawn<T: 'static + Send + Fn()>(&self, func: T) -> Result {
+ let init = pin_init!(ClosureWork {
+ work <- Work::new(),
+ func: Some(func),
+ });
+
+ self.enqueue(Box::pin_init(init)?);
+ Ok(())
+ }
+}
+
+/// A helper type used in `try_spawn`.
+#[pin_data]
+struct ClosureWork<T> {
+ #[pin]
+ work: Work<Pin<Box<ClosureWork<T>>>>,
+ func: Option<T>,
+}
+
+impl<T> ClosureWork<T> {
+ fn project(self: Pin<&mut Self>) -> &mut Option<T> {
+ // SAFETY: The `func` field is not structurally pinned.
+ unsafe { &mut self.get_unchecked_mut().func }
+ }
+}
+
+impl<T: FnOnce()> BoxWorkItem for ClosureWork<T> {
+ fn run(mut self: Pin<Box<Self>>) {
+ if let Some(func) = self.as_mut().project().take() {
+ (func)()
+ }
+ }
}

/// A work item.
@@ -280,6 +316,10 @@ macro_rules! impl_has_work {
)*};
}

+impl_has_work! {
+ impl<T> HasWork<Pin<Box<Self>>> for ClosureWork<T> { self.work }
+}
+
/// Declares that [`Arc<Self>`] should implement [`WorkItem`].
///
/// # Examples
--
2.40.1.606.ga4b1b128d6-goog
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