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Vendor dependencies for 0.3.0 release

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Robert Garrett
2025-09-27 10:29:08 -05:00
parent 0c8d39d483
commit 82ab7f317b
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# Changelog
All notable changes to this project will be documented in this file.
The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
## [Unreleased]
## [1.1.9](https://github.com/Amanieu/thread_local-rs/compare/v1.1.8...v1.1.9) - 2025-06-12
### Other
- Add release-plz for automated releases
- Remove once_cell dependency
- Bump MSRV to 1.61

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51
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# THIS FILE IS AUTOMATICALLY GENERATED BY CARGO
#
# When uploading crates to the registry Cargo will automatically
# "normalize" Cargo.toml files for maximal compatibility
# with all versions of Cargo and also rewrite `path` dependencies
# to registry (e.g., crates.io) dependencies.
#
# If you are reading this file be aware that the original Cargo.toml
# will likely look very different (and much more reasonable).
# See Cargo.toml.orig for the original contents.
[package]
edition = "2021"
rust-version = "1.63"
name = "thread_local"
version = "1.1.9"
authors = ["Amanieu d'Antras <amanieu@gmail.com>"]
build = false
autolib = false
autobins = false
autoexamples = false
autotests = false
autobenches = false
description = "Per-object thread-local storage"
documentation = "https://docs.rs/thread_local/"
readme = "README.md"
keywords = [
"thread_local",
"concurrent",
"thread",
]
license = "MIT OR Apache-2.0"
repository = "https://github.com/Amanieu/thread_local-rs"
[features]
nightly = []
[lib]
name = "thread_local"
path = "src/lib.rs"
[[bench]]
name = "thread_local"
path = "benches/thread_local.rs"
harness = false
[dependencies.cfg-if]
version = "1.0.0"
[dev-dependencies.criterion]
version = "0.5.1"

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vendor/thread_local/LICENSE-MIT vendored Normal file
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Copyright (c) 2016 The Rust Project Developers
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
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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
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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.

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thread_local
============
[![Build Status](https://github.com/Amanieu/thread_local-rs/actions/workflows/ci.yml/badge.svg)](https://github.com/Amanieu/thread_local-rs/actions) [![crates.io](https://img.shields.io/crates/v/thread_local.svg)](https://crates.io/crates/thread_local)
This library provides the `ThreadLocal` type which allow a separate copy of an
object to be used for each thread. This allows for per-object thread-local
storage, unlike the standard library's `thread_local!` macro which only allows
static thread-local storage.
[Documentation](https://docs.rs/thread_local/)
## Usage
Add this to your `Cargo.toml`:
```toml
[dependencies]
thread_local = "1.1"
```
## Minimum Rust version
This crate's minimum supported Rust version (MSRV) is 1.63.0.
## License
Licensed under either of
* Apache License, Version 2.0, ([LICENSE-APACHE](LICENSE-APACHE) or http://www.apache.org/licenses/LICENSE-2.0)
* MIT license ([LICENSE-MIT](LICENSE-MIT) or http://opensource.org/licenses/MIT)
at your option.
### Contribution
Unless you explicitly state otherwise, any contribution intentionally submitted
for inclusion in the work by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any
additional terms or conditions.

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use criterion::{black_box, BatchSize};
use thread_local::ThreadLocal;
fn main() {
let mut c = criterion::Criterion::default().configure_from_args();
c.bench_function("get", |b| {
let local = ThreadLocal::new();
local.get_or(|| Box::new(0));
b.iter(|| {
black_box(local.get());
});
});
c.bench_function("insert", |b| {
b.iter_batched_ref(
ThreadLocal::new,
|local| {
black_box(local.get_or(|| 0));
},
BatchSize::SmallInput,
)
});
}

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vendor/thread_local/src/cached.rs vendored Normal file
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#![allow(deprecated)]
use super::{IntoIter, IterMut, ThreadLocal};
use std::fmt;
use std::panic::UnwindSafe;
use std::usize;
/// Wrapper around [`ThreadLocal`].
///
/// This used to add a fast path for a single thread, however that has been
/// obsoleted by performance improvements to [`ThreadLocal`] itself.
#[deprecated(since = "1.1.0", note = "Use `ThreadLocal` instead")]
pub struct CachedThreadLocal<T: Send> {
inner: ThreadLocal<T>,
}
impl<T: Send> Default for CachedThreadLocal<T> {
fn default() -> CachedThreadLocal<T> {
CachedThreadLocal::new()
}
}
impl<T: Send> CachedThreadLocal<T> {
/// Creates a new empty `CachedThreadLocal`.
#[inline]
pub fn new() -> CachedThreadLocal<T> {
CachedThreadLocal {
inner: ThreadLocal::new(),
}
}
/// Returns the element for the current thread, if it exists.
#[inline]
pub fn get(&self) -> Option<&T> {
self.inner.get()
}
/// Returns the element for the current thread, or creates it if it doesn't
/// exist.
#[inline]
pub fn get_or<F>(&self, create: F) -> &T
where
F: FnOnce() -> T,
{
self.inner.get_or(create)
}
/// Returns the element for the current thread, or creates it if it doesn't
/// exist. If `create` fails, that error is returned and no element is
/// added.
#[inline]
pub fn get_or_try<F, E>(&self, create: F) -> Result<&T, E>
where
F: FnOnce() -> Result<T, E>,
{
self.inner.get_or_try(create)
}
/// Returns a mutable iterator over the local values of all threads.
///
/// Since this call borrows the `ThreadLocal` mutably, this operation can
/// be done safely---the mutable borrow statically guarantees no other
/// threads are currently accessing their associated values.
#[inline]
pub fn iter_mut(&mut self) -> CachedIterMut<T> {
CachedIterMut {
inner: self.inner.iter_mut(),
}
}
/// Removes all thread-specific values from the `ThreadLocal`, effectively
/// reseting it to its original state.
///
/// Since this call borrows the `ThreadLocal` mutably, this operation can
/// be done safely---the mutable borrow statically guarantees no other
/// threads are currently accessing their associated values.
#[inline]
pub fn clear(&mut self) {
self.inner.clear();
}
}
impl<T: Send> IntoIterator for CachedThreadLocal<T> {
type Item = T;
type IntoIter = CachedIntoIter<T>;
fn into_iter(self) -> CachedIntoIter<T> {
CachedIntoIter {
inner: self.inner.into_iter(),
}
}
}
impl<'a, T: Send + 'a> IntoIterator for &'a mut CachedThreadLocal<T> {
type Item = &'a mut T;
type IntoIter = CachedIterMut<'a, T>;
fn into_iter(self) -> CachedIterMut<'a, T> {
self.iter_mut()
}
}
impl<T: Send + Default> CachedThreadLocal<T> {
/// Returns the element for the current thread, or creates a default one if
/// it doesn't exist.
pub fn get_or_default(&self) -> &T {
self.get_or(T::default)
}
}
impl<T: Send + fmt::Debug> fmt::Debug for CachedThreadLocal<T> {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "ThreadLocal {{ local_data: {:?} }}", self.get())
}
}
impl<T: Send + UnwindSafe> UnwindSafe for CachedThreadLocal<T> {}
/// Mutable iterator over the contents of a `CachedThreadLocal`.
#[deprecated(since = "1.1.0", note = "Use `IterMut` instead")]
pub struct CachedIterMut<'a, T: Send + 'a> {
inner: IterMut<'a, T>,
}
impl<'a, T: Send + 'a> Iterator for CachedIterMut<'a, T> {
type Item = &'a mut T;
#[inline]
fn next(&mut self) -> Option<&'a mut T> {
self.inner.next()
}
#[inline]
fn size_hint(&self) -> (usize, Option<usize>) {
self.inner.size_hint()
}
}
impl<'a, T: Send + 'a> ExactSizeIterator for CachedIterMut<'a, T> {}
/// An iterator that moves out of a `CachedThreadLocal`.
#[deprecated(since = "1.1.0", note = "Use `IntoIter` instead")]
pub struct CachedIntoIter<T: Send> {
inner: IntoIter<T>,
}
impl<T: Send> Iterator for CachedIntoIter<T> {
type Item = T;
#[inline]
fn next(&mut self) -> Option<T> {
self.inner.next()
}
#[inline]
fn size_hint(&self) -> (usize, Option<usize>) {
self.inner.size_hint()
}
}
impl<T: Send> ExactSizeIterator for CachedIntoIter<T> {}

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// Copyright 2017 Amanieu d'Antras
//
// Licensed under the Apache License, Version 2.0, <LICENSE-APACHE or
// http://apache.org/licenses/LICENSE-2.0> or the MIT license <LICENSE-MIT or
// http://opensource.org/licenses/MIT>, at your option. This file may not be
// copied, modified, or distributed except according to those terms.
//! Per-object thread-local storage
//!
//! This library provides the `ThreadLocal` type which allows a separate copy of
//! an object to be used for each thread. This allows for per-object
//! thread-local storage, unlike the standard library's `thread_local!` macro
//! which only allows static thread-local storage.
//!
//! Per-thread objects are not destroyed when a thread exits. Instead, objects
//! are only destroyed when the `ThreadLocal` containing them is destroyed.
//!
//! You can also iterate over the thread-local values of all thread in a
//! `ThreadLocal` object using the `iter_mut` and `into_iter` methods. This can
//! only be done if you have mutable access to the `ThreadLocal` object, which
//! guarantees that you are the only thread currently accessing it.
//!
//! Note that since thread IDs are recycled when a thread exits, it is possible
//! for one thread to retrieve the object of another thread. Since this can only
//! occur after a thread has exited this does not lead to any race conditions.
//!
//! # Examples
//!
//! Basic usage of `ThreadLocal`:
//!
//! ```rust
//! use thread_local::ThreadLocal;
//! let tls: ThreadLocal<u32> = ThreadLocal::new();
//! assert_eq!(tls.get(), None);
//! assert_eq!(tls.get_or(|| 5), &5);
//! assert_eq!(tls.get(), Some(&5));
//! ```
//!
//! Combining thread-local values into a single result:
//!
//! ```rust
//! use thread_local::ThreadLocal;
//! use std::sync::Arc;
//! use std::cell::Cell;
//! use std::thread;
//!
//! let tls = Arc::new(ThreadLocal::new());
//!
//! // Create a bunch of threads to do stuff
//! for _ in 0..5 {
//! let tls2 = tls.clone();
//! thread::spawn(move || {
//! // Increment a counter to count some event...
//! let cell = tls2.get_or(|| Cell::new(0));
//! cell.set(cell.get() + 1);
//! }).join().unwrap();
//! }
//!
//! // Once all threads are done, collect the counter values and return the
//! // sum of all thread-local counter values.
//! let tls = Arc::try_unwrap(tls).unwrap();
//! let total = tls.into_iter().fold(0, |x, y| x + y.get());
//! assert_eq!(total, 5);
//! ```
#![warn(missing_docs)]
#![allow(clippy::mutex_atomic)]
#![cfg_attr(feature = "nightly", feature(thread_local))]
mod cached;
mod thread_id;
mod unreachable;
#[allow(deprecated)]
pub use cached::{CachedIntoIter, CachedIterMut, CachedThreadLocal};
use std::cell::UnsafeCell;
use std::fmt;
use std::iter::FusedIterator;
use std::mem;
use std::mem::MaybeUninit;
use std::panic::UnwindSafe;
use std::ptr;
use std::sync::atomic::{AtomicBool, AtomicPtr, AtomicUsize, Ordering};
use thread_id::Thread;
use unreachable::UncheckedResultExt;
// Use usize::BITS once it has stabilized and the MSRV has been bumped.
#[cfg(target_pointer_width = "16")]
const POINTER_WIDTH: u8 = 16;
#[cfg(target_pointer_width = "32")]
const POINTER_WIDTH: u8 = 32;
#[cfg(target_pointer_width = "64")]
const POINTER_WIDTH: u8 = 64;
/// The total number of buckets stored in each thread local.
/// All buckets combined can hold up to `usize::MAX - 1` entries.
const BUCKETS: usize = (POINTER_WIDTH - 1) as usize;
/// Thread-local variable wrapper
///
/// See the [module-level documentation](index.html) for more.
pub struct ThreadLocal<T: Send> {
/// The buckets in the thread local. The nth bucket contains `2^n`
/// elements. Each bucket is lazily allocated.
buckets: [AtomicPtr<Entry<T>>; BUCKETS],
/// The number of values in the thread local. This can be less than the real number of values,
/// but is never more.
values: AtomicUsize,
}
struct Entry<T> {
present: AtomicBool,
value: UnsafeCell<MaybeUninit<T>>,
}
impl<T> Drop for Entry<T> {
fn drop(&mut self) {
unsafe {
if *self.present.get_mut() {
ptr::drop_in_place((*self.value.get()).as_mut_ptr());
}
}
}
}
// ThreadLocal is always Sync, even if T isn't
unsafe impl<T: Send> Sync for ThreadLocal<T> {}
impl<T: Send> Default for ThreadLocal<T> {
fn default() -> ThreadLocal<T> {
ThreadLocal::new()
}
}
impl<T: Send> Drop for ThreadLocal<T> {
fn drop(&mut self) {
// Free each non-null bucket
for (i, bucket) in self.buckets.iter_mut().enumerate() {
let bucket_ptr = *bucket.get_mut();
let this_bucket_size = 1 << i;
if bucket_ptr.is_null() {
continue;
}
unsafe { deallocate_bucket(bucket_ptr, this_bucket_size) };
}
}
}
impl<T: Send> ThreadLocal<T> {
/// Creates a new empty `ThreadLocal`.
pub const fn new() -> ThreadLocal<T> {
let buckets = [ptr::null_mut::<Entry<T>>(); BUCKETS];
Self {
buckets: unsafe { mem::transmute(buckets) },
values: AtomicUsize::new(0),
}
}
/// Creates a new `ThreadLocal` with an initial capacity. If less than the capacity threads
/// access the thread local it will never reallocate. The capacity may be rounded up to the
/// nearest power of two.
pub fn with_capacity(capacity: usize) -> ThreadLocal<T> {
let allocated_buckets = usize::from(POINTER_WIDTH) - (capacity.leading_zeros() as usize);
let mut buckets = [ptr::null_mut(); BUCKETS];
for (i, bucket) in buckets[..allocated_buckets].iter_mut().enumerate() {
*bucket = allocate_bucket::<T>(1 << i);
}
Self {
// Safety: AtomicPtr has the same representation as a pointer and arrays have the same
// representation as a sequence of their inner type.
buckets: unsafe { mem::transmute(buckets) },
values: AtomicUsize::new(0),
}
}
/// Returns the element for the current thread, if it exists.
pub fn get(&self) -> Option<&T> {
self.get_inner(thread_id::get())
}
/// Returns the element for the current thread, or creates it if it doesn't
/// exist.
pub fn get_or<F>(&self, create: F) -> &T
where
F: FnOnce() -> T,
{
unsafe {
self.get_or_try(|| Ok::<T, ()>(create()))
.unchecked_unwrap_ok()
}
}
/// Returns the element for the current thread, or creates it if it doesn't
/// exist. If `create` fails, that error is returned and no element is
/// added.
pub fn get_or_try<F, E>(&self, create: F) -> Result<&T, E>
where
F: FnOnce() -> Result<T, E>,
{
let thread = thread_id::get();
if let Some(val) = self.get_inner(thread) {
return Ok(val);
}
Ok(self.insert(thread, create()?))
}
fn get_inner(&self, thread: Thread) -> Option<&T> {
let bucket_ptr =
unsafe { self.buckets.get_unchecked(thread.bucket) }.load(Ordering::Acquire);
if bucket_ptr.is_null() {
return None;
}
unsafe {
let entry = &*bucket_ptr.add(thread.index);
if entry.present.load(Ordering::Relaxed) {
Some(&*(&*entry.value.get()).as_ptr())
} else {
None
}
}
}
#[cold]
fn insert(&self, thread: Thread, data: T) -> &T {
let bucket_atomic_ptr = unsafe { self.buckets.get_unchecked(thread.bucket) };
let bucket_ptr: *const _ = bucket_atomic_ptr.load(Ordering::Acquire);
// If the bucket doesn't already exist, we need to allocate it
let bucket_ptr = if bucket_ptr.is_null() {
let new_bucket = allocate_bucket(thread.bucket_size);
match bucket_atomic_ptr.compare_exchange(
ptr::null_mut(),
new_bucket,
Ordering::AcqRel,
Ordering::Acquire,
) {
Ok(_) => new_bucket,
// If the bucket value changed (from null), that means
// another thread stored a new bucket before we could,
// and we can free our bucket and use that one instead
Err(bucket_ptr) => {
unsafe { deallocate_bucket(new_bucket, thread.bucket_size) }
bucket_ptr
}
}
} else {
bucket_ptr
};
// Insert the new element into the bucket
let entry = unsafe { &*bucket_ptr.add(thread.index) };
let value_ptr = entry.value.get();
unsafe { value_ptr.write(MaybeUninit::new(data)) };
entry.present.store(true, Ordering::Release);
self.values.fetch_add(1, Ordering::Release);
unsafe { &*(&*value_ptr).as_ptr() }
}
/// Returns an iterator over the local values of all threads in unspecified
/// order.
///
/// This call can be done safely, as `T` is required to implement [`Sync`].
pub fn iter(&self) -> Iter<'_, T>
where
T: Sync,
{
Iter {
thread_local: self,
raw: RawIter::new(),
}
}
/// Returns a mutable iterator over the local values of all threads in
/// unspecified order.
///
/// Since this call borrows the `ThreadLocal` mutably, this operation can
/// be done safely---the mutable borrow statically guarantees no other
/// threads are currently accessing their associated values.
pub fn iter_mut(&mut self) -> IterMut<T> {
IterMut {
thread_local: self,
raw: RawIter::new(),
}
}
/// Removes all thread-specific values from the `ThreadLocal`, effectively
/// reseting it to its original state.
///
/// Since this call borrows the `ThreadLocal` mutably, this operation can
/// be done safely---the mutable borrow statically guarantees no other
/// threads are currently accessing their associated values.
pub fn clear(&mut self) {
*self = ThreadLocal::new();
}
}
impl<T: Send> IntoIterator for ThreadLocal<T> {
type Item = T;
type IntoIter = IntoIter<T>;
fn into_iter(self) -> IntoIter<T> {
IntoIter {
thread_local: self,
raw: RawIter::new(),
}
}
}
impl<'a, T: Send + Sync> IntoIterator for &'a ThreadLocal<T> {
type Item = &'a T;
type IntoIter = Iter<'a, T>;
fn into_iter(self) -> Self::IntoIter {
self.iter()
}
}
impl<'a, T: Send> IntoIterator for &'a mut ThreadLocal<T> {
type Item = &'a mut T;
type IntoIter = IterMut<'a, T>;
fn into_iter(self) -> IterMut<'a, T> {
self.iter_mut()
}
}
impl<T: Send + Default> ThreadLocal<T> {
/// Returns the element for the current thread, or creates a default one if
/// it doesn't exist.
pub fn get_or_default(&self) -> &T {
self.get_or(Default::default)
}
}
impl<T: Send + fmt::Debug> fmt::Debug for ThreadLocal<T> {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "ThreadLocal {{ local_data: {:?} }}", self.get())
}
}
impl<T: Send + UnwindSafe> UnwindSafe for ThreadLocal<T> {}
#[derive(Debug)]
struct RawIter {
yielded: usize,
bucket: usize,
bucket_size: usize,
index: usize,
}
impl RawIter {
#[inline]
fn new() -> Self {
Self {
yielded: 0,
bucket: 0,
bucket_size: 1,
index: 0,
}
}
fn next<'a, T: Send + Sync>(&mut self, thread_local: &'a ThreadLocal<T>) -> Option<&'a T> {
while self.bucket < BUCKETS {
let bucket = unsafe { thread_local.buckets.get_unchecked(self.bucket) };
let bucket = bucket.load(Ordering::Acquire);
if !bucket.is_null() {
while self.index < self.bucket_size {
let entry = unsafe { &*bucket.add(self.index) };
self.index += 1;
if entry.present.load(Ordering::Acquire) {
self.yielded += 1;
return Some(unsafe { &*(&*entry.value.get()).as_ptr() });
}
}
}
self.next_bucket();
}
None
}
fn next_mut<'a, T: Send>(
&mut self,
thread_local: &'a mut ThreadLocal<T>,
) -> Option<&'a mut Entry<T>> {
if *thread_local.values.get_mut() == self.yielded {
return None;
}
loop {
let bucket = unsafe { thread_local.buckets.get_unchecked_mut(self.bucket) };
let bucket = *bucket.get_mut();
if !bucket.is_null() {
while self.index < self.bucket_size {
let entry = unsafe { &mut *bucket.add(self.index) };
self.index += 1;
if *entry.present.get_mut() {
self.yielded += 1;
return Some(entry);
}
}
}
self.next_bucket();
}
}
#[inline]
fn next_bucket(&mut self) {
self.bucket_size <<= 1;
self.bucket += 1;
self.index = 0;
}
fn size_hint<T: Send>(&self, thread_local: &ThreadLocal<T>) -> (usize, Option<usize>) {
let total = thread_local.values.load(Ordering::Acquire);
(total - self.yielded, None)
}
fn size_hint_frozen<T: Send>(&self, thread_local: &ThreadLocal<T>) -> (usize, Option<usize>) {
let total = unsafe { *(&thread_local.values as *const AtomicUsize as *const usize) };
let remaining = total - self.yielded;
(remaining, Some(remaining))
}
}
/// Iterator over the contents of a `ThreadLocal`.
#[derive(Debug)]
pub struct Iter<'a, T: Send + Sync> {
thread_local: &'a ThreadLocal<T>,
raw: RawIter,
}
impl<'a, T: Send + Sync> Iterator for Iter<'a, T> {
type Item = &'a T;
fn next(&mut self) -> Option<Self::Item> {
self.raw.next(self.thread_local)
}
fn size_hint(&self) -> (usize, Option<usize>) {
self.raw.size_hint(self.thread_local)
}
}
impl<T: Send + Sync> FusedIterator for Iter<'_, T> {}
/// Mutable iterator over the contents of a `ThreadLocal`.
pub struct IterMut<'a, T: Send> {
thread_local: &'a mut ThreadLocal<T>,
raw: RawIter,
}
impl<'a, T: Send> Iterator for IterMut<'a, T> {
type Item = &'a mut T;
fn next(&mut self) -> Option<&'a mut T> {
self.raw
.next_mut(self.thread_local)
.map(|entry| unsafe { &mut *(&mut *entry.value.get()).as_mut_ptr() })
}
fn size_hint(&self) -> (usize, Option<usize>) {
self.raw.size_hint_frozen(self.thread_local)
}
}
impl<T: Send> ExactSizeIterator for IterMut<'_, T> {}
impl<T: Send> FusedIterator for IterMut<'_, T> {}
// Manual impl so we don't call Debug on the ThreadLocal, as doing so would create a reference to
// this thread's value that potentially aliases with a mutable reference we have given out.
impl<'a, T: Send + fmt::Debug> fmt::Debug for IterMut<'a, T> {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
f.debug_struct("IterMut").field("raw", &self.raw).finish()
}
}
/// An iterator that moves out of a `ThreadLocal`.
#[derive(Debug)]
pub struct IntoIter<T: Send> {
thread_local: ThreadLocal<T>,
raw: RawIter,
}
impl<T: Send> Iterator for IntoIter<T> {
type Item = T;
fn next(&mut self) -> Option<T> {
self.raw.next_mut(&mut self.thread_local).map(|entry| {
*entry.present.get_mut() = false;
unsafe {
std::mem::replace(&mut *entry.value.get(), MaybeUninit::uninit()).assume_init()
}
})
}
fn size_hint(&self) -> (usize, Option<usize>) {
self.raw.size_hint_frozen(&self.thread_local)
}
}
impl<T: Send> ExactSizeIterator for IntoIter<T> {}
impl<T: Send> FusedIterator for IntoIter<T> {}
fn allocate_bucket<T>(size: usize) -> *mut Entry<T> {
Box::into_raw(
(0..size)
.map(|_| Entry::<T> {
present: AtomicBool::new(false),
value: UnsafeCell::new(MaybeUninit::uninit()),
})
.collect(),
) as *mut _
}
unsafe fn deallocate_bucket<T>(bucket: *mut Entry<T>, size: usize) {
let _ = Box::from_raw(std::slice::from_raw_parts_mut(bucket, size));
}
#[cfg(test)]
mod tests {
use super::*;
use std::cell::RefCell;
use std::sync::atomic::AtomicUsize;
use std::sync::atomic::Ordering::Relaxed;
use std::sync::Arc;
use std::thread;
fn make_create() -> Arc<dyn Fn() -> usize + Send + Sync> {
let count = AtomicUsize::new(0);
Arc::new(move || count.fetch_add(1, Relaxed))
}
#[test]
fn same_thread() {
let create = make_create();
let mut tls = ThreadLocal::new();
assert_eq!(None, tls.get());
assert_eq!("ThreadLocal { local_data: None }", format!("{:?}", &tls));
assert_eq!(0, *tls.get_or(|| create()));
assert_eq!(Some(&0), tls.get());
assert_eq!(0, *tls.get_or(|| create()));
assert_eq!(Some(&0), tls.get());
assert_eq!(0, *tls.get_or(|| create()));
assert_eq!(Some(&0), tls.get());
assert_eq!("ThreadLocal { local_data: Some(0) }", format!("{:?}", &tls));
tls.clear();
assert_eq!(None, tls.get());
}
#[test]
fn different_thread() {
let create = make_create();
let tls = Arc::new(ThreadLocal::new());
assert_eq!(None, tls.get());
assert_eq!(0, *tls.get_or(|| create()));
assert_eq!(Some(&0), tls.get());
let tls2 = tls.clone();
let create2 = create.clone();
thread::spawn(move || {
assert_eq!(None, tls2.get());
assert_eq!(1, *tls2.get_or(|| create2()));
assert_eq!(Some(&1), tls2.get());
})
.join()
.unwrap();
assert_eq!(Some(&0), tls.get());
assert_eq!(0, *tls.get_or(|| create()));
}
#[test]
fn iter() {
let tls = Arc::new(ThreadLocal::new());
tls.get_or(|| Box::new(1));
let tls2 = tls.clone();
thread::spawn(move || {
tls2.get_or(|| Box::new(2));
let tls3 = tls2.clone();
thread::spawn(move || {
tls3.get_or(|| Box::new(3));
})
.join()
.unwrap();
drop(tls2);
})
.join()
.unwrap();
let mut tls = Arc::try_unwrap(tls).unwrap();
let mut v = tls.iter().map(|x| **x).collect::<Vec<i32>>();
v.sort_unstable();
assert_eq!(vec![1, 2, 3], v);
let mut v = tls.iter_mut().map(|x| **x).collect::<Vec<i32>>();
v.sort_unstable();
assert_eq!(vec![1, 2, 3], v);
let mut v = tls.into_iter().map(|x| *x).collect::<Vec<i32>>();
v.sort_unstable();
assert_eq!(vec![1, 2, 3], v);
}
#[test]
fn miri_iter_soundness_check() {
let tls = Arc::new(ThreadLocal::new());
let _local = tls.get_or(|| Box::new(1));
let tls2 = tls.clone();
let join_1 = thread::spawn(move || {
let _tls = tls2.get_or(|| Box::new(2));
let iter = tls2.iter();
for item in iter {
println!("{:?}", item);
}
});
let iter = tls.iter();
for item in iter {
println!("{:?}", item);
}
join_1.join().ok();
}
#[test]
fn test_drop() {
let local = ThreadLocal::new();
struct Dropped(Arc<AtomicUsize>);
impl Drop for Dropped {
fn drop(&mut self) {
self.0.fetch_add(1, Relaxed);
}
}
let dropped = Arc::new(AtomicUsize::new(0));
local.get_or(|| Dropped(dropped.clone()));
assert_eq!(dropped.load(Relaxed), 0);
drop(local);
assert_eq!(dropped.load(Relaxed), 1);
}
#[test]
fn test_earlyreturn_buckets() {
struct Dropped(Arc<AtomicUsize>);
impl Drop for Dropped {
fn drop(&mut self) {
self.0.fetch_add(1, Relaxed);
}
}
let dropped = Arc::new(AtomicUsize::new(0));
// We use a high `id` here to guarantee that a lazily allocated bucket somewhere in the middle is used.
// Neither iteration nor `Drop` must early-return on `null` buckets that are used for lower `buckets`.
let thread = Thread::new(1234);
assert!(thread.bucket > 1);
let mut local = ThreadLocal::new();
local.insert(thread, Dropped(dropped.clone()));
let item = local.iter().next().unwrap();
assert_eq!(item.0.load(Relaxed), 0);
let item = local.iter_mut().next().unwrap();
assert_eq!(item.0.load(Relaxed), 0);
drop(local);
assert_eq!(dropped.load(Relaxed), 1);
}
#[test]
fn is_sync() {
fn foo<T: Sync>() {}
foo::<ThreadLocal<String>>();
foo::<ThreadLocal<RefCell<String>>>();
}
}

210
vendor/thread_local/src/thread_id.rs vendored Normal file
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// Copyright 2017 Amanieu d'Antras
//
// Licensed under the Apache License, Version 2.0, <LICENSE-APACHE or
// http://apache.org/licenses/LICENSE-2.0> or the MIT license <LICENSE-MIT or
// http://opensource.org/licenses/MIT>, at your option. This file may not be
// copied, modified, or distributed except according to those terms.
use crate::POINTER_WIDTH;
use std::cell::Cell;
use std::cmp::Reverse;
use std::collections::BinaryHeap;
use std::sync::Mutex;
/// Thread ID manager which allocates thread IDs. It attempts to aggressively
/// reuse thread IDs where possible to avoid cases where a ThreadLocal grows
/// indefinitely when it is used by many short-lived threads.
struct ThreadIdManager {
free_from: usize,
free_list: Option<BinaryHeap<Reverse<usize>>>,
}
impl ThreadIdManager {
const fn new() -> Self {
Self {
free_from: 0,
free_list: None,
}
}
fn alloc(&mut self) -> usize {
if let Some(id) = self.free_list.as_mut().and_then(|heap| heap.pop()) {
id.0
} else {
// `free_from` can't overflow as each thread takes up at least 2 bytes of memory and
// thus we can't even have `usize::MAX / 2 + 1` threads.
let id = self.free_from;
self.free_from += 1;
id
}
}
fn free(&mut self, id: usize) {
self.free_list
.get_or_insert_with(BinaryHeap::new)
.push(Reverse(id));
}
}
static THREAD_ID_MANAGER: Mutex<ThreadIdManager> = Mutex::new(ThreadIdManager::new());
/// Data which is unique to the current thread while it is running.
/// A thread ID may be reused after a thread exits.
#[derive(Clone, Copy)]
pub(crate) struct Thread {
/// The thread ID obtained from the thread ID manager.
pub(crate) id: usize,
/// The bucket this thread's local storage will be in.
pub(crate) bucket: usize,
/// The size of the bucket this thread's local storage will be in.
pub(crate) bucket_size: usize,
/// The index into the bucket this thread's local storage is in.
pub(crate) index: usize,
}
impl Thread {
pub(crate) fn new(id: usize) -> Self {
let bucket = usize::from(POINTER_WIDTH) - ((id + 1).leading_zeros() as usize) - 1;
let bucket_size = 1 << bucket;
let index = id - (bucket_size - 1);
Self {
id,
bucket,
bucket_size,
index,
}
}
}
cfg_if::cfg_if! {
if #[cfg(feature = "nightly")] {
// This is split into 2 thread-local variables so that we can check whether the
// thread is initialized without having to register a thread-local destructor.
//
// This makes the fast path smaller.
#[thread_local]
static mut THREAD: Option<Thread> = None;
thread_local! { static THREAD_GUARD: ThreadGuard = const { ThreadGuard { id: Cell::new(0) } }; }
// Guard to ensure the thread ID is released on thread exit.
struct ThreadGuard {
// We keep a copy of the thread ID in the ThreadGuard: we can't
// reliably access THREAD in our Drop impl due to the unpredictable
// order of TLS destructors.
id: Cell<usize>,
}
impl Drop for ThreadGuard {
fn drop(&mut self) {
// Release the thread ID. Any further accesses to the thread ID
// will go through get_slow which will either panic or
// initialize a new ThreadGuard.
unsafe {
THREAD = None;
}
THREAD_ID_MANAGER.lock().unwrap().free(self.id.get());
}
}
/// Returns a thread ID for the current thread, allocating one if needed.
#[inline]
pub(crate) fn get() -> Thread {
if let Some(thread) = unsafe { THREAD } {
thread
} else {
get_slow()
}
}
/// Out-of-line slow path for allocating a thread ID.
#[cold]
fn get_slow() -> Thread {
let new = Thread::new(THREAD_ID_MANAGER.lock().unwrap().alloc());
unsafe {
THREAD = Some(new);
}
THREAD_GUARD.with(|guard| guard.id.set(new.id));
new
}
} else {
// This is split into 2 thread-local variables so that we can check whether the
// thread is initialized without having to register a thread-local destructor.
//
// This makes the fast path smaller.
thread_local! { static THREAD: Cell<Option<Thread>> = const { Cell::new(None) }; }
thread_local! { static THREAD_GUARD: ThreadGuard = const { ThreadGuard { id: Cell::new(0) } }; }
// Guard to ensure the thread ID is released on thread exit.
struct ThreadGuard {
// We keep a copy of the thread ID in the ThreadGuard: we can't
// reliably access THREAD in our Drop impl due to the unpredictable
// order of TLS destructors.
id: Cell<usize>,
}
impl Drop for ThreadGuard {
fn drop(&mut self) {
// Release the thread ID. Any further accesses to the thread ID
// will go through get_slow which will either panic or
// initialize a new ThreadGuard.
let _ = THREAD.try_with(|thread| thread.set(None));
THREAD_ID_MANAGER.lock().unwrap().free(self.id.get());
}
}
/// Returns a thread ID for the current thread, allocating one if needed.
#[inline]
pub(crate) fn get() -> Thread {
THREAD.with(|thread| {
if let Some(thread) = thread.get() {
thread
} else {
get_slow(thread)
}
})
}
/// Out-of-line slow path for allocating a thread ID.
#[cold]
fn get_slow(thread: &Cell<Option<Thread>>) -> Thread {
let new = Thread::new(THREAD_ID_MANAGER.lock().unwrap().alloc());
thread.set(Some(new));
THREAD_GUARD.with(|guard| guard.id.set(new.id));
new
}
}
}
#[test]
fn test_thread() {
let thread = Thread::new(0);
assert_eq!(thread.id, 0);
assert_eq!(thread.bucket, 0);
assert_eq!(thread.bucket_size, 1);
assert_eq!(thread.index, 0);
let thread = Thread::new(1);
assert_eq!(thread.id, 1);
assert_eq!(thread.bucket, 1);
assert_eq!(thread.bucket_size, 2);
assert_eq!(thread.index, 0);
let thread = Thread::new(2);
assert_eq!(thread.id, 2);
assert_eq!(thread.bucket, 1);
assert_eq!(thread.bucket_size, 2);
assert_eq!(thread.index, 1);
let thread = Thread::new(3);
assert_eq!(thread.id, 3);
assert_eq!(thread.bucket, 2);
assert_eq!(thread.bucket_size, 4);
assert_eq!(thread.index, 0);
let thread = Thread::new(19);
assert_eq!(thread.id, 19);
assert_eq!(thread.bucket, 4);
assert_eq!(thread.bucket_size, 16);
assert_eq!(thread.index, 4);
}

57
vendor/thread_local/src/unreachable.rs vendored Normal file
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// Copyright 2017 Amanieu d'Antras
//
// Licensed under the Apache License, Version 2.0, <LICENSE-APACHE or
// http://apache.org/licenses/LICENSE-2.0> or the MIT license <LICENSE-MIT or
// http://opensource.org/licenses/MIT>, at your option. This file may not be
// copied, modified, or distributed except according to those terms.
use std::hint::unreachable_unchecked;
/// An extension trait for `Option<T>` providing unchecked unwrapping methods.
pub trait UncheckedOptionExt<T> {
/// Get the value out of this Option without checking for None.
unsafe fn unchecked_unwrap(self) -> T;
/// Assert that this Option is a None to the optimizer.
unsafe fn unchecked_unwrap_none(self);
}
/// An extension trait for `Result<T, E>` providing unchecked unwrapping methods.
pub trait UncheckedResultExt<T, E> {
/// Get the value out of this Result without checking for Err.
unsafe fn unchecked_unwrap_ok(self) -> T;
/// Get the error out of this Result without checking for Ok.
unsafe fn unchecked_unwrap_err(self) -> E;
}
impl<T> UncheckedOptionExt<T> for Option<T> {
unsafe fn unchecked_unwrap(self) -> T {
match self {
Some(x) => x,
None => unreachable_unchecked(),
}
}
unsafe fn unchecked_unwrap_none(self) {
if self.is_some() {
unreachable_unchecked()
}
}
}
impl<T, E> UncheckedResultExt<T, E> for Result<T, E> {
unsafe fn unchecked_unwrap_ok(self) -> T {
match self {
Ok(x) => x,
Err(_) => unreachable_unchecked(),
}
}
unsafe fn unchecked_unwrap_err(self) -> E {
match self {
Ok(_) => unreachable_unchecked(),
Err(e) => e,
}
}
}