Commit f431c5c5 authored by Boqun Feng's avatar Boqun Feng Committed by Miguel Ojeda
Browse files

samples: rust: print: Add sample code for Arc printing 



This both demonstrates the usage of different print format in Rust and
serves as a selftest for the `Display` and `Debug` implementation of
`Arc` and its friends.

Signed-off-by: default avatarBoqun Feng <boqun.feng@gmail.com>
Reviewed-by: default avatarBjörn Roy Baron <bjorn3_gh@protonmail.com>
Reviewed-by: default avatarFinn Behrens <fin@nyantec.com>
Reviewed-by: default avatarVincenzo Palazzo <vincenzopalazzodev@gmail.com>
Reviewed-by: default avatarGary Guo <gary@garyguo.net>
Reviewed-by: default avatarAndreas Hindborg <a.hindborg@samsung.com>
Link: https://lore.kernel.org/r/20230207185216.1314638-3-boqun.feng@gmail.com


[ Applied suggestions and reworded for fixing title typos. ]
Signed-off-by: default avatarMiguel Ojeda <ojeda@kernel.org>
parent 00140a83

samples/rust/rust_print.rs

+26 −0
Original line number Diff line number Diff line
@@ -15,6 +15,30 @@ 


struct RustPrint;



fn arc_print() -> Result {

    use kernel::sync::*;



    let a = Arc::try_new(1)?;

    let b = UniqueArc::try_new("hello, world")?;



    // Prints the value of data in `a`.

    pr_info!("{}", a);



    // Uses ":?" to print debug fmt of `b`.

    pr_info!("{:?}", b);



    let a: Arc<&str> = b.into();

    let c = a.clone();



    // Uses `dbg` to print, will move `c` (for temporary debugging purposes).

    dbg!(c);



    // Pretty-prints the debug formatting with lower-case hexadecimal integers.

    pr_info!("{:#x?}", a);



    Ok(())

}



impl kernel::Module for RustPrint {

    fn init(_module: &'static ThisModule) -> Result<Self> {

        pr_info!("Rust printing macros sample (init)\n");
@@ -43,6 +67,8 @@ fn init(_module: &'static ThisModule) -> Result<Self> { 
        pr_cont!(" is {}", "continued");

        pr_cont!(" with {}\n", "args");



        arc_print()?;



        Ok(RustPrint)

    }

}