linux-kernel - Re: [PATCH v2 3/4] rust: sync: add `CondVar::wait

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Message-ID: <CAH5fLggOxwx4+qDjP8WV_e1Nw3oxAxXDDJuQ30uSVEcA_yn55w@mail.gmail.com>
Date: Thu, 4 Jan 2024 14:48:44 +0100
From: Alice Ryhl <aliceryhl@...gle.com>
To: Boqun Feng <boqun.feng@...il.com>
Cc: Miguel Ojeda <ojeda@...nel.org>, Alex Gaynor <alex.gaynor@...il.com>, 
	Wedson Almeida Filho <wedsonaf@...il.com>, Gary Guo <gary@...yguo.net>, 
	Björn Roy Baron <bjorn3_gh@...tonmail.com>, 
	Benno Lossin <benno.lossin@...ton.me>, Andreas Hindborg <a.hindborg@...sung.com>, 
	Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>, Will Deacon <will@...nel.org>, 
	Waiman Long <longman@...hat.com>, Tiago Lam <tiagolam@...il.com>, 
	Thomas Gleixner <tglx@...utronix.de>, rust-for-linux@...r.kernel.org, 
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 3/4] rust: sync: add `CondVar::wait_timeout`

On Mon, Dec 18, 2023 at 10:15 PM Boqun Feng <boqun.feng@...il.com> wrote:
>
> On Sat, Dec 16, 2023 at 03:31:41PM +0000, Alice Ryhl wrote:
> > +const MAX_SCHEDULE_TIMEOUT: c_long = c_long::MAX;
> > +
>
> I'd like to put this in rust/kernel/time.rs or rust/kernel/task.rs, but
> it's not a blocker.

I'll move it to task.rs.

> > -    fn wait_internal<T: ?Sized, B: Backend>(&self, wait_state: u32, guard: &mut Guard<'_, T, B>) {
> > +    fn wait_internal<T: ?Sized, B: Backend>(
> > +        &self,
> > +        wait_state: u32,
> > +        guard: &mut Guard<'_, T, B>,
> > +        timeout: c_long,
>
> Nit: maybe `timeout_in_jiffies` instead of `timeout`? Or we have another
> data type:
>
>         pub type DeltaJiffies = c_long;
>
> or
>
>         pub type JiffyDelta = c_long;
>
> because a "c_long timeout" really hurts the readability.

I will rename this to timeout_in_jiffies.

Alice