[PATCH grout] replace clock_t with Grout specific high-res clock

[Robin Jarry]

Morten Brørup, May 24, 2026 at 20:39:
> Nanosecond resolution opens possibilities, which are not available
> with microsecond resolution, e.g. shaping and pacing (which
> I understand is WIP); and the type it replaces also uses 64 bit, so
> the resolution improvement does not have a memory cost.
>
> Yes, in the long term, I plan to add less precise types.

Ack.

> I can fix long lines.
> What's the max number of characters per line?

100 columns.

https://github.com/DPDK/grout/blob/v0.15.0/.clang-format#L59
https://github.com/DPDK/grout/blob/v0.15.0/devtools/check-comments#L40

> How to continue a long line on the next line in Grout?

Just write it however you want or keep it in a single line, clang-format
will make it follow the coding style rules :)

> "make lint" spews out warnings about things I didn't touch.
> Do I need to set up some configuration file or pass special parameters for this to work?
>
> My build server is running: Ubuntu 24.04.<redacted> LTS
>
> $ clang-format --version
> Ubuntu clang-format version 18.1.3 (1ubuntu1)

This is way too old. Unfortunately, clang-format has breaking changes on
every release... I think the oldest version we settled on is 21 (22 is
the latest upstream). This means running from Ubuntu/Debian packages is
practically not possible as they are always lagging behind.

The most practical solution is to run it from a container:

	podman run --name clang-format -d \
		--mount type=bind,src=$PWD,dst=/src --workdir /src \
		docker.io/xianpengshen/clang-tools:22 \
		bash -c 'apt-get update -q && apt-get install -qy make git && tail -f /dev/null'
	podman logs clang-format -f

Once make and git are installed, just use podman exec:

	podman exec -it clang-format make lint
	podman exec -it clang-format make format

-- 
Robin

> Offer limited to residents of the contiguous United States.