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Merge #38
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38: Add empty portable-atomic-util crate r=taiki-e a=taiki-e

This adds an empty crate named `portable-atomic-util`.

For now, I'm considering putting the features proposed in #1 (#8) and #37 into this crate, but they may be merged into the main `portable-atomic` crate in the future.


Co-authored-by: Taiki Endo <[email protected]>
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bors[bot] and taiki-e authored Sep 12, 2022
2 parents 68f4394 + eb54f11 commit 8a653b6
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1 change: 1 addition & 0 deletions Cargo.toml
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Expand Up @@ -20,6 +20,7 @@ targets = ["x86_64-unknown-linux-gnu"]
[workspace]
members = [
"bench",
"portable-atomic-util",
"tests/api-test",
]

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1 change: 1 addition & 0 deletions bench/version.rs
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../version.rs
99 changes: 4 additions & 95 deletions build.rs
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Expand Up @@ -2,6 +2,10 @@

#![warn(rust_2018_idioms, single_use_lifetimes)]

#[path = "version.rs"]
mod version;
use version::{rustc_version, Version};

use std::{env, str};

include!("no_atomic.rs");
Expand Down Expand Up @@ -337,98 +341,3 @@ fn is_allowed_feature(name: &str) -> bool {
// allowed by default
true
}

mod version {
use std::{env, process::Command, str};

pub(crate) struct Version {
pub(crate) minor: u32,
pub(crate) nightly: bool,
commit_date: Date,
pub(crate) llvm: u32,
}

impl Version {
pub(crate) const LATEST: Self = Self::stable(63);

const fn stable(minor: u32) -> Self {
Self { minor, nightly: false, commit_date: Date::new(0, 0, 0), llvm: 0 }
}

pub(crate) fn probe(&self, minor: u32, year: u16, month: u8, day: u8) -> bool {
self.minor >= minor
&& (!self.nightly || self.commit_date >= Date::new(year, month, day))
}
}

#[derive(PartialEq, Eq, PartialOrd, Ord)]
struct Date {
year: u16,
month: u8,
day: u8,
}

impl Date {
const fn new(year: u16, month: u8, day: u8) -> Self {
Self { year, month, day }
}
}

pub(crate) fn rustc_version() -> Option<Version> {
let rustc = env::var_os("RUSTC")?;
// Use verbose version output because the packagers add extra strings to the normal version output.
let output = Command::new(rustc).args(&["--version", "--verbose"]).output().ok()?;
let output = str::from_utf8(&output.stdout).ok()?;

let mut release = output
.lines()
.find(|line| line.starts_with("release: "))
.map(|line| &line["release: ".len()..])?
.splitn(2, '-');
let version = release.next().unwrap();
let channel = release.next().unwrap_or_default();
let mut digits = version.splitn(3, '.');
let major = digits.next()?.parse::<u32>().ok()?;
if major != 1 {
return None;
}
let minor = digits.next()?.parse::<u32>().ok()?;
let _patch = digits.next().unwrap_or("0").parse::<u32>().ok()?;
let nightly = channel == "nightly" || channel == "dev";

if nightly {
let llvm_major = (|| {
let version = output
.lines()
.find(|line| line.starts_with("LLVM version: "))
.map(|line| &line["LLVM version: ".len()..])?;
let mut digits = version.splitn(3, '.');
let major = digits.next()?.parse::<u32>().ok()?;
let _minor = digits.next()?.parse::<u32>().ok()?;
let _patch = digits.next().unwrap_or("0").parse::<u32>().ok()?;
Some(major)
})();

let mut commit_date = output
.lines()
.find(|line| line.starts_with("commit-date: "))
.map(|line| &line["commit-date: ".len()..])?
.splitn(3, '-');
let year = commit_date.next()?.parse::<u16>().ok()?;
let month = commit_date.next()?.parse::<u8>().ok()?;
let day = commit_date.next()?.parse::<u8>().ok()?;
if month > 12 || day > 31 {
return None;
}
Some(Version {
minor,
nightly,
commit_date: Date::new(year, month, day),
llvm: llvm_major.unwrap_or(0),
})
} else {
Some(Version::stable(minor))
}
}
}
use version::{rustc_version, Version};
23 changes: 23 additions & 0 deletions portable-atomic-util/Cargo.toml
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[package]
name = "portable-atomic-util"
version = "0.3.15"
edition = "2018"
rust-version = "1.34"
license = "Apache-2.0 OR MIT"
repository = "https://github.com/taiki-e/portable-atomic"
keywords = ["atomic"]
categories = ["concurrency", "data-structures", "embedded", "hardware-support", "no-std"]
description = """
Synchronization primitives built with portable-atomic.
"""

[package.metadata.docs.rs]
targets = ["x86_64-unknown-linux-gnu"]

[features]
default = ["std"]
std = ["alloc"]
alloc = []

[dependencies]
portable-atomic = { version = "=0.3.15", default-features = false }
177 changes: 177 additions & 0 deletions portable-atomic-util/LICENSE-APACHE
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23 changes: 23 additions & 0 deletions portable-atomic-util/LICENSE-MIT
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Permission is hereby granted, free of charge, to any
person obtaining a copy of this software and associated
documentation files (the "Software"), to deal in the
Software without restriction, including without
limitation the rights to use, copy, modify, merge,
publish, distribute, sublicense, and/or sell copies of
the Software, and to permit persons to whom the Software
is furnished to do so, subject to the following
conditions:

The above copyright notice and this permission notice
shall be included in all copies or substantial portions
of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF
ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT
SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR
IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
DEALINGS IN THE SOFTWARE.
3 changes: 3 additions & 0 deletions portable-atomic-util/README.md
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# portable-atomic-util

Synchronization primitives built with portable-atomic.
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