Examples: Ported the AsyncAPI example of CUDA samples

[madhav-madhusoodanan]

Context

Ported the asyncAPI sample from NVIDIA/cuda-samples .

Relevant Issue

• Port CUDA samples #238

[LegNeato]

Thanks for the PR and welcome! 🍾

Two small things:

1. rustfmt is failing
2. let's put these in their own subdir with a README so as we add more they are in a single place and folks know where they come from.

[madhav-madhusoodanan]

Sure thing!
I put this specific example under samples/introduction just to be in line with NVIDIA's folder structure.

I'm looking to get just this one example merged for now, in future PRs I'll add the samples in batches.

[LegNeato]

Clippy is failing 📋

[madhav-madhusoodanan]

I'm also curious about the error on Windows:

       Finished `dev` profile [unoptimized + debuginfo] target(s) in 2m 10s
  error: failed to run `rustc` to learn about target-specific information

  Caused by:
    process didn't exit successfully: `C:\Users\runneradmin\.rustup\toolchains\nightly-2025-08-04-x86_64-pc-windows-msvc\bin\rustc.exe - --crate-name ___ --print=file-names -Zcodegen-backend=D:\a\rust-cuda\rust-cuda\target\debug\rustc_codegen_nvvm.dll -Zcrate-attr=feature(register_tool) -Zcrate-attr=register_tool(nvvm_internal) -Zcrate-attr=no_std -Zsaturating_float_casts=false "-Cllvm-args=-arch=compute_61 --override-libm" --target nvptx64-nvidia-cuda --crate-type bin --crate-type rlib --crate-type dylib --crate-type cdylib --crate-type staticlib --crate-type proc-macro --print=sysroot --print=split-debuginfo --print=crate-name --print=cfg -Wwarnings` (exit code: 1)
    --- stderr
    error: couldn't load codegen backend \\?\D:\a\rust-cuda\rust-cuda\target\debug\rustc_codegen_nvvm.dll: LoadLibraryExW failed: The specified module could not be found. (os error 126) (The specified module could not be found. (os error 126)) (retried 5 times)


  thread 'main' panicked at samples\introduction\async_api\build.rs:16:10:

[LegNeato]

I'm also curious about the error on Windows:

       Finished `dev` profile [unoptimized + debuginfo] target(s) in 2m 10s
  error: failed to run `rustc` to learn about target-specific information

  Caused by:
    process didn't exit successfully: `C:\Users\runneradmin\.rustup\toolchains\nightly-2025-08-04-x86_64-pc-windows-msvc\bin\rustc.exe - --crate-name ___ --print=file-names -Zcodegen-backend=D:\a\rust-cuda\rust-cuda\target\debug\rustc_codegen_nvvm.dll -Zcrate-attr=feature(register_tool) -Zcrate-attr=register_tool(nvvm_internal) -Zcrate-attr=no_std -Zsaturating_float_casts=false "-Cllvm-args=-arch=compute_61 --override-libm" --target nvptx64-nvidia-cuda --crate-type bin --crate-type rlib --crate-type dylib --crate-type cdylib --crate-type staticlib --crate-type proc-macro --print=sysroot --print=split-debuginfo --print=crate-name --print=cfg -Wwarnings` (exit code: 1)
    --- stderr
    error: couldn't load codegen backend \\?\D:\a\rust-cuda\rust-cuda\target\debug\rustc_codegen_nvvm.dll: LoadLibraryExW failed: The specified module could not be found. (os error 126) (The specified module could not be found. (os error 126)) (retried 5 times)


  thread 'main' panicked at samples\introduction\async_api\build.rs:16:10:

I think this is #220. I don't have a windows machine so can't debug.

[LegNeato]

Clippy issues are back

[madhav-madhusoodanan]

Ahh my bad, fixed the clippy issues.
Let me tinker on my Windows machine to see if I can fix the issue on Windows.