linux-kernel - Re: [PATCH v2 8/8] rust: workqueue: add examples

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Date:   Fri, 02 Jun 2023 16:44:15 +0200
From:   "Andreas Hindborg (Samsung)" <nmi@...aspace.dk>
To:     Alice Ryhl <aliceryhl@...gle.com>
Cc:     rust-for-linux@...r.kernel.org, Miguel Ojeda <ojeda@...nel.org>,
        Wedson Almeida Filho <wedsonaf@...il.com>,
        Tejun Heo <tj@...nel.org>,
        Lai Jiangshan <jiangshanlai@...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>,
        linux-kernel@...r.kernel.org, patches@...ts.linux.dev
Subject: Re: [PATCH v2 8/8] rust: workqueue: add examples


Alice Ryhl <aliceryhl@...gle.com> writes:

> 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: Andreas Hindborg (Samsung) <nmi@...aspace.dk>

> ---
>  rust/kernel/workqueue.rs | 104 +++++++++++++++++++++++++++++++++++++++
>  1 file changed, 104 insertions(+)
>
> diff --git a/rust/kernel/workqueue.rs b/rust/kernel/workqueue.rs
> index c302e8b8624b..cefcf43ff40e 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(),
> +//!         }))
> +//!     }
> +//! }
> +//!
> +//! 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(),
> +//!             work_2 <- Work::new(),
> +//!         }))
> +//!     }
> +//! }
> +//!
> +//! 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, types::Opaque};