mirror of https://github.com/smol-rs/async-lock
Initial commit
This commit is contained in:
commit
dc66c0665e
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@ -0,0 +1 @@
|
|||
github: stjepang
|
|
@ -0,0 +1,51 @@
|
|||
name: Build and test
|
||||
|
||||
on:
|
||||
push:
|
||||
branches:
|
||||
- master
|
||||
pull_request:
|
||||
|
||||
jobs:
|
||||
build_and_test:
|
||||
runs-on: ${{ matrix.os }}
|
||||
strategy:
|
||||
fail-fast: false
|
||||
matrix:
|
||||
os: [ubuntu-latest]
|
||||
rust: [nightly, beta, stable]
|
||||
steps:
|
||||
- uses: actions/checkout@v2
|
||||
|
||||
- name: Set current week of the year in environnement
|
||||
if: startsWith(matrix.os, 'ubuntu') || startsWith(matrix.os, 'macOS')
|
||||
run: echo "::set-env name=CURRENT_WEEK::$(date +%V)"
|
||||
|
||||
- name: Set current week of the year in environnement
|
||||
if: startsWith(matrix.os, 'windows')
|
||||
run: echo "::set-env name=CURRENT_WEEK::$(Get-Date -UFormat %V)"
|
||||
|
||||
- name: Install latest ${{ matrix.rust }}
|
||||
uses: actions-rs/toolchain@v1
|
||||
with:
|
||||
toolchain: ${{ matrix.rust }}
|
||||
profile: minimal
|
||||
override: true
|
||||
|
||||
- name: Run cargo check
|
||||
uses: actions-rs/cargo@v1
|
||||
with:
|
||||
command: check
|
||||
args: --all --benches --bins --examples --tests --all-features
|
||||
|
||||
- name: Run cargo check (without dev-dependencies to catch missing feature flags)
|
||||
if: startsWith(matrix.rust, 'nightly')
|
||||
uses: actions-rs/cargo@v1
|
||||
with:
|
||||
command: check
|
||||
args: -Z features=dev_dep
|
||||
|
||||
- name: Run cargo test
|
||||
uses: actions-rs/cargo@v1
|
||||
with:
|
||||
command: test
|
|
@ -0,0 +1,26 @@
|
|||
name: Lint
|
||||
|
||||
on:
|
||||
push:
|
||||
branches:
|
||||
- master
|
||||
pull_request:
|
||||
|
||||
jobs:
|
||||
clippy:
|
||||
runs-on: ubuntu-latest
|
||||
steps:
|
||||
- uses: actions/checkout@v2
|
||||
|
||||
- name: Set current week of the year in environnement
|
||||
run: echo "::set-env name=CURRENT_WEEK::$(date +%V)"
|
||||
|
||||
- uses: actions-rs/toolchain@v1
|
||||
with:
|
||||
toolchain: stable
|
||||
profile: minimal
|
||||
components: clippy
|
||||
- uses: actions-rs/clippy-check@v1
|
||||
with:
|
||||
token: ${{ secrets.GITHUB_TOKEN }}
|
||||
args: --all-features -- -W clippy::all
|
|
@ -0,0 +1,20 @@
|
|||
name: Security audit
|
||||
|
||||
on:
|
||||
push:
|
||||
branches:
|
||||
- master
|
||||
pull_request:
|
||||
|
||||
jobs:
|
||||
security_audit:
|
||||
runs-on: ubuntu-latest
|
||||
steps:
|
||||
- uses: actions/checkout@v2
|
||||
|
||||
- name: Set current week of the year in environnement
|
||||
run: echo "::set-env name=CURRENT_WEEK::$(date +%V)"
|
||||
|
||||
- uses: actions-rs/audit-check@v1
|
||||
with:
|
||||
token: ${{ secrets.GITHUB_TOKEN }}
|
|
@ -0,0 +1,2 @@
|
|||
/target
|
||||
Cargo.lock
|
|
@ -0,0 +1,3 @@
|
|||
# Version 1.0.0
|
||||
|
||||
- Initial version
|
|
@ -0,0 +1,19 @@
|
|||
[package]
|
||||
name = "async-lock"
|
||||
version = "1.0.0"
|
||||
authors = ["Stjepan Glavina <stjepang@gmail.com>"]
|
||||
edition = "2018"
|
||||
description = "Reference-counted async lock"
|
||||
license = "Apache-2.0 OR MIT"
|
||||
repository = "https://github.com/stjepang/async-lock"
|
||||
homepage = "https://github.com/stjepang/async-lock"
|
||||
documentation = "https://docs.rs/async-lock"
|
||||
keywords = ["async", "file", "stdio", "stdin", "process"]
|
||||
categories = ["asynchronous", "concurrency"]
|
||||
readme = "README.md"
|
||||
|
||||
[dependencies]
|
||||
event-listener = "1.0.0"
|
||||
|
||||
[dev-dependencies]
|
||||
smol = "0.1.6"
|
|
@ -0,0 +1,201 @@
|
|||
Apache License
|
||||
Version 2.0, January 2004
|
||||
http://www.apache.org/licenses/
|
||||
|
||||
TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
|
||||
|
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|
@ -0,0 +1,57 @@
|
|||
# async-lock
|
||||
|
||||
[![Build](https://github.com/stjepang/async-lock/workflows/Build%20and%20test/badge.svg)](
|
||||
https://github.com/stjepang/async-lock/actions)
|
||||
![Rustc version](https://img.shields.io/badge/rustc-1.40+-lightgray.svg)
|
||||
[![License](https://img.shields.io/badge/license-MIT%2FApache--2.0-blue.svg)](
|
||||
https://github.com/stjepang/async-lock)
|
||||
[![Cargo](https://img.shields.io/crates/v/async-lock.svg)](
|
||||
https://crates.io/crates/async-lock)
|
||||
[![Documentation](https://docs.rs/async-lock/badge.svg)](
|
||||
https://docs.rs/async-lock)
|
||||
|
||||
Reference-counted async lock.
|
||||
|
||||
The `Lock` type is similar to `std::sync::Mutex`, except locking is an async operation.
|
||||
|
||||
Note that `Lock` by itself acts like an `Arc` in the sense that cloning it returns just
|
||||
another reference to the same lock.
|
||||
|
||||
Furthermore, `LockGuard` is not tied to `Lock` by a lifetime, so you can keep guards for
|
||||
as long as you want. This is useful when you want to spawn a task and move a guard into its
|
||||
future.
|
||||
|
||||
## Examples
|
||||
|
||||
```rust
|
||||
use async_lock::Lock;
|
||||
use smol::Task;
|
||||
|
||||
let lock = Lock::new(0);
|
||||
let mut tasks = vec![];
|
||||
|
||||
for _ in 0..10 {
|
||||
let lock = lock.clone();
|
||||
tasks.push(Task::spawn(async move { *lock.lock().await += 1 }));
|
||||
}
|
||||
|
||||
for task in tasks {
|
||||
task.await;
|
||||
}
|
||||
assert_eq!(*lock.lock().await, 10);
|
||||
```
|
||||
|
||||
## 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.
|
|
@ -0,0 +1,212 @@
|
|||
//! Reference-counted async lock.
|
||||
//!
|
||||
//! The [`Lock`] type is similar to [`std::sync::Mutex`], except locking is an async operation.
|
||||
//!
|
||||
//! Note that [`Lock`] by itself acts like an [`Arc`] in the sense that cloning it returns just
|
||||
//! another reference to the same lock.
|
||||
//!
|
||||
//! Furthermore, [`LockGuard`] is not tied to [`Lock`] by a lifetime, so you can keep guards for
|
||||
//! as long as you want. This is useful when you want to spawn a task and move a guard into its
|
||||
//! future.
|
||||
//!
|
||||
//! # Examples
|
||||
//!
|
||||
//! ```
|
||||
//! # smol::run(async {
|
||||
//! use async_lock::Lock;
|
||||
//! use smol::Task;
|
||||
//!
|
||||
//! let lock = Lock::new(0);
|
||||
//! let mut tasks = vec![];
|
||||
//!
|
||||
//! for _ in 0..10 {
|
||||
//! let lock = lock.clone();
|
||||
//! tasks.push(Task::spawn(async move { *lock.lock().await += 1 }));
|
||||
//! }
|
||||
//!
|
||||
//! for task in tasks {
|
||||
//! task.await;
|
||||
//! }
|
||||
//! assert_eq!(*lock.lock().await, 10);
|
||||
//! # })
|
||||
//! ```
|
||||
|
||||
#![warn(missing_docs, missing_debug_implementations, rust_2018_idioms)]
|
||||
|
||||
use std::cell::UnsafeCell;
|
||||
use std::fmt;
|
||||
use std::ops::{Deref, DerefMut};
|
||||
use std::sync::atomic::{AtomicBool, Ordering};
|
||||
use std::sync::Arc;
|
||||
|
||||
use event_listener::Event;
|
||||
|
||||
/// An async lock.
|
||||
pub struct Lock<T>(Arc<Inner<T>>);
|
||||
|
||||
impl<T> Clone for Lock<T> {
|
||||
fn clone(&self) -> Lock<T> {
|
||||
Lock(self.0.clone())
|
||||
}
|
||||
}
|
||||
|
||||
/// Data inside [`Lock`].
|
||||
struct Inner<T> {
|
||||
/// Set to `true` when the lock is acquired by a [`LockGuard`].
|
||||
locked: AtomicBool,
|
||||
|
||||
/// Lock operations waiting for the lock to be released.
|
||||
lock_ops: Event,
|
||||
|
||||
/// The value inside the lock.
|
||||
data: UnsafeCell<T>,
|
||||
}
|
||||
|
||||
unsafe impl<T: Send> Send for Lock<T> {}
|
||||
unsafe impl<T: Send> Sync for Lock<T> {}
|
||||
|
||||
impl<T> Lock<T> {
|
||||
/// Creates a new async lock.
|
||||
///
|
||||
/// # Examples
|
||||
///
|
||||
/// ```
|
||||
/// use async_lock::Lock;
|
||||
///
|
||||
/// let lock = Lock::new(0);
|
||||
/// ```
|
||||
pub fn new(data: T) -> Lock<T> {
|
||||
Lock(Arc::new(Inner {
|
||||
locked: AtomicBool::new(false),
|
||||
lock_ops: Event::new(),
|
||||
data: UnsafeCell::new(data),
|
||||
}))
|
||||
}
|
||||
|
||||
/// Acquires the lock.
|
||||
///
|
||||
/// Returns a guard that releases the lock when dropped.
|
||||
///
|
||||
/// # Examples
|
||||
///
|
||||
/// ```
|
||||
/// # smol::block_on(async {
|
||||
/// use async_lock::Lock;
|
||||
///
|
||||
/// let lock = Lock::new(10);
|
||||
/// let guard = lock.lock().await;
|
||||
/// assert_eq!(*guard, 10);
|
||||
/// # })
|
||||
/// ```
|
||||
pub async fn lock(&self) -> LockGuard<T> {
|
||||
loop {
|
||||
// Try acquiring the lock.
|
||||
if let Some(guard) = self.try_lock() {
|
||||
return guard;
|
||||
}
|
||||
|
||||
// Start watching for notifications and try locking again.
|
||||
let listener = self.0.lock_ops.listen();
|
||||
if let Some(guard) = self.try_lock() {
|
||||
return guard;
|
||||
}
|
||||
listener.await;
|
||||
}
|
||||
}
|
||||
|
||||
/// Attempts to acquire the lock.
|
||||
///
|
||||
/// If the lock could not be acquired at this time, then [`None`] is returned. Otherwise, a
|
||||
/// guard is returned that releases the lock when dropped.
|
||||
///
|
||||
/// # Examples
|
||||
///
|
||||
/// ```
|
||||
/// use async_lock::Lock;
|
||||
///
|
||||
/// let lock = Lock::new(10);
|
||||
/// if let Some(guard) = lock.try_lock() {
|
||||
/// assert_eq!(*guard, 10);
|
||||
/// }
|
||||
/// # ;
|
||||
/// ```
|
||||
#[inline]
|
||||
pub fn try_lock(&self) -> Option<LockGuard<T>> {
|
||||
if !self
|
||||
.0
|
||||
.locked
|
||||
.compare_and_swap(false, true, Ordering::Acquire)
|
||||
{
|
||||
Some(LockGuard(self.0.clone()))
|
||||
} else {
|
||||
None
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
impl<T: fmt::Debug> fmt::Debug for Lock<T> {
|
||||
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
|
||||
struct Locked;
|
||||
impl fmt::Debug for Locked {
|
||||
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
|
||||
f.write_str("<locked>")
|
||||
}
|
||||
}
|
||||
|
||||
match self.try_lock() {
|
||||
None => f.debug_struct("Lock").field("data", &Locked).finish(),
|
||||
Some(guard) => f.debug_struct("Lock").field("data", &&*guard).finish(),
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
impl<T> From<T> for Lock<T> {
|
||||
fn from(val: T) -> Lock<T> {
|
||||
Lock::new(val)
|
||||
}
|
||||
}
|
||||
|
||||
impl<T: Default> Default for Lock<T> {
|
||||
fn default() -> Lock<T> {
|
||||
Lock::new(Default::default())
|
||||
}
|
||||
}
|
||||
|
||||
/// A guard that releases the lock when dropped.
|
||||
pub struct LockGuard<T>(Arc<Inner<T>>);
|
||||
|
||||
unsafe impl<T: Send> Send for LockGuard<T> {}
|
||||
unsafe impl<T: Sync> Sync for LockGuard<T> {}
|
||||
|
||||
impl<T> Drop for LockGuard<T> {
|
||||
fn drop(&mut self) {
|
||||
self.0.locked.store(false, Ordering::Release);
|
||||
self.0.lock_ops.notify_one();
|
||||
}
|
||||
}
|
||||
|
||||
impl<T: fmt::Debug> fmt::Debug for LockGuard<T> {
|
||||
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
|
||||
fmt::Debug::fmt(&**self, f)
|
||||
}
|
||||
}
|
||||
|
||||
impl<T: fmt::Display> fmt::Display for LockGuard<T> {
|
||||
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
|
||||
(**self).fmt(f)
|
||||
}
|
||||
}
|
||||
|
||||
impl<T> Deref for LockGuard<T> {
|
||||
type Target = T;
|
||||
|
||||
fn deref(&self) -> &T {
|
||||
unsafe { &*self.0.data.get() }
|
||||
}
|
||||
}
|
||||
|
||||
impl<T> DerefMut for LockGuard<T> {
|
||||
fn deref_mut(&mut self) -> &mut T {
|
||||
unsafe { &mut *self.0.data.get() }
|
||||
}
|
||||
}
|
Loading…
Reference in New Issue