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Date: Tue, 11 Jul 2023 09:33:03 +0000
From: Alice Ryhl <aliceryhl@...gle.com>
To: rust-for-linux@...r.kernel.org, Tejun Heo <tj@...nel.org>,
Miguel Ojeda <ojeda@...nel.org>
Cc: Lai Jiangshan <jiangshanlai@...il.com>,
Wedson Almeida Filho <wedsonaf@...il.com>,
Alex Gaynor <alex.gaynor@...il.com>,
Boqun Feng <boqun.feng@...il.com>, Gary Guo <gary@...yguo.net>,
"Björn Roy Baron" <bjorn3_gh@...tonmail.com>,
Benno Lossin <benno.lossin@...ton.me>,
Alice Ryhl <aliceryhl@...gle.com>,
linux-kernel@...r.kernel.org, patches@...ts.linux.dev,
Martin Rodriguez Reboredo <yakoyoku@...il.com>,
Andreas Hindborg <nmi@...aspace.dk>
Subject: [PATCH v3 9/9] rust: workqueue: add examples
This adds two examples of how to use the workqueue. The first example
shows how to use it when you only have one `work_struct` field, and the
second example shows how to use it when you have multiple `work_struct`
fields.
Signed-off-by: Alice Ryhl <aliceryhl@...gle.com>
Reviewed-by: Martin Rodriguez Reboredo <yakoyoku@...il.com>
Reviewed-by: Gary Guo <gary@...yguo.net>
Reviewed-by: Andreas Hindborg (Samsung) <nmi@...aspace.dk>
Reviewed-by: Benno Lossin <benno.lossin@...ton.me>
---
v2 -> v3:
* Use LockClassKey in constructors in examples.
* Add Reviewed-by from Martin, Gary, Andreas, Benno.
rust/kernel/workqueue.rs | 104 +++++++++++++++++++++++++++++++++++++++
1 file changed, 104 insertions(+)
diff --git a/rust/kernel/workqueue.rs b/rust/kernel/workqueue.rs
index 3a3a8b52bfd9..482d3eeae7d8 100644
--- a/rust/kernel/workqueue.rs
+++ b/rust/kernel/workqueue.rs
@@ -26,6 +26,110 @@
//! * The `WorkItemPointer` trait is implemented for the pointer type that points at a something
//! that implements `WorkItem`.
//!
+//! ## Example
+//!
+//! This example defines a struct that holds an integer and can be scheduled on the workqueue. When
+//! the struct is executed, it will print the integer. Since there is only one `work_struct` field,
+//! we do not need to specify ids for the fields.
+//!
+//! ```
+//! use kernel::prelude::*;
+//! use kernel::sync::Arc;
+//! use kernel::workqueue::{self, Work, WorkItem};
+//!
+//! #[pin_data]
+//! struct MyStruct {
+//! value: i32,
+//! #[pin]
+//! work: Work<MyStruct>,
+//! }
+//!
+//! impl_has_work! {
+//! impl HasWork<Self> for MyStruct { self.work }
+//! }
+//!
+//! impl MyStruct {
+//! fn new(value: i32) -> Result<Arc<Self>> {
+//! Arc::pin_init(pin_init!(MyStruct {
+//! value,
+//! work <- Work::new(kernel::static_lock_class!()),
+//! }))
+//! }
+//! }
+//!
+//! impl WorkItem for MyStruct {
+//! type Pointer = Arc<MyStruct>;
+//!
+//! fn run(this: Arc<MyStruct>) {
+//! pr_info!("The value is: {}", this.value);
+//! }
+//! }
+//!
+//! /// This method will enqueue the struct for execution on the system workqueue, where its value
+//! /// will be printed.
+//! fn print_later(val: Arc<MyStruct>) {
+//! let _ = workqueue::system().enqueue(val);
+//! }
+//! ```
+//!
+//! The following example shows how multiple `work_struct` fields can be used:
+//!
+//! ```
+//! use kernel::prelude::*;
+//! use kernel::sync::Arc;
+//! use kernel::workqueue::{self, Work, WorkItem};
+//!
+//! #[pin_data]
+//! struct MyStruct {
+//! value_1: i32,
+//! value_2: i32,
+//! #[pin]
+//! work_1: Work<MyStruct, 1>,
+//! #[pin]
+//! work_2: Work<MyStruct, 2>,
+//! }
+//!
+//! impl_has_work! {
+//! impl HasWork<Self, 1> for MyStruct { self.work_1 }
+//! impl HasWork<Self, 2> for MyStruct { self.work_2 }
+//! }
+//!
+//! impl MyStruct {
+//! fn new(value_1: i32, value_2: i32) -> Result<Arc<Self>> {
+//! Arc::pin_init(pin_init!(MyStruct {
+//! value_1,
+//! value_2,
+//! work_1 <- Work::new(kernel::static_lock_class!()),
+//! work_2 <- Work::new(kernel::static_lock_class!()),
+//! }))
+//! }
+//! }
+//!
+//! impl WorkItem<1> for MyStruct {
+//! type Pointer = Arc<MyStruct>;
+//!
+//! fn run(this: Arc<MyStruct>) {
+//! pr_info!("The value is: {}", this.value_1);
+//! }
+//! }
+//!
+//! impl WorkItem<2> for MyStruct {
+//! type Pointer = Arc<MyStruct>;
+//!
+//! fn run(this: Arc<MyStruct>) {
+//! pr_info!("The second value is: {}", this.value_2);
+//! }
+//! }
+//!
+//! fn print_1_later(val: Arc<MyStruct>) {
+//! let _ = workqueue::system().enqueue::<Arc<MyStruct>, 1>(val);
+//! }
+//!
+//! fn print_2_later(val: Arc<MyStruct>) {
+//! let _ = workqueue::system().enqueue::<Arc<MyStruct>, 2>(val);
+//! }
+//! ```
+//!
//! C header: [`include/linux/workqueue.h`](../../../../include/linux/workqueue.h)
use crate::{bindings, prelude::*, sync::Arc, sync::LockClassKey, types::Opaque};
--
2.41.0.255.g8b1d071c50-goog
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