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{"files":{"CHANGELOG.md":"72d885bc3a99f56e571909247b3f900290b4c5815527ae7429d9242be0f37eca","Cargo.toml":"5dff2b5f3c2ebe3407d3831123742d4487f0503eb6a3bac977a10c434182dc1b","LICENSE-APACHE":"a60eea817514531668d7e00765731449fe14d059d3249e0bc93b36de45f759f2","LICENSE-MIT":"cc02a53316678ca2575cc69d12daa7b1833935d4b7742c31fbab7bd74a481077","README.md":"d8aeacf48cef529d1911cd76d54e4286c223609e3a79bec5822d0f60d3b83fb5","src/lib.rs":"78e80913b97cb55dfc87bd3206b88fdb7e3f42a645df32bac951648e025262b2","tests/basic.rs":"6a5494add9d37957b6d1e62c8008b38197fbf8a8f5c6fa8c30e55d5572bf04d8"},"package":"22686f4785f02a4fcc856d3b3bb19bf6c8160d103f7a99cc258bddd0251dc7f2"}

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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
### Added
### Removed
### Changed
### Fixed
# [0.3.0] - 2023-02-07
### Added
- `pollster::main` and `pollster::test` procedural macros, akin to `tokio::main` and `tokio::test`
### Changed
- Improved performance by removing unnecessary allocation

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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 = "2018"
name = "pollster"
version = "0.3.0"
authors = ["Joshua Barretto <joshua.s.barretto@gmail.com>"]
description = "Synchronously block the thread until a future completes"
readme = "README.md"
keywords = [
"async",
"minimal",
"executor",
"runtime",
"block_on",
]
categories = [
"asynchronous",
"concurrency",
]
license = "Apache-2.0/MIT"
repository = "https://github.com/zesterer/pollster"
[dependencies.pollster-macro]
version = "0.1"
optional = true
[dev-dependencies.futures-timer]
version = "3.0"
[dev-dependencies.tokio]
version = "1"
features = ["sync"]
[features]
macro = ["pollster-macro"]

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Copyright (c) 2020-2021 Joshua Barretto
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# Pollster
Pollster is an incredibly minimal async executor for Rust that lets you block a thread until a future completes.
[![Cargo](https://img.shields.io/crates/v/pollster.svg)](
https://crates.io/crates/pollster)
[![Documentation](https://docs.rs/pollster/badge.svg)](
https://docs.rs/pollster)
[![License](https://img.shields.io/badge/license-MIT%2FApache--2.0-blue.svg)](
https://github.com/zesterer/pollster)
![actions-badge](https://github.com/zesterer/pollster/workflows/Rust/badge.svg?branch=master)
```rust
use pollster::FutureExt as _;
let my_fut = async {};
let result = my_fut.block_on();
```
That's it. That's all it does. Nothing more, nothing less. No need to pull in 50 crates to evaluate a future.
## Why is this useful?
Now that `async` functions are stable, we're increasingly seeing libraries all over the Rust ecosystem expose `async`
APIs. This is great for those wanting to build highly concurrent web applications!
However, many of us are *not* building highly concurrent web applications, but end up faced with an `async` function
that we can't easily call from synchronous code. If you're in this position, then `pollster` is for you: it allows you
to evaluate a future in-place without spinning up a heavyweight runtime like `tokio` or `async_std`.
## Minimalism
Pollster is built with the [UNIX ethos](https://en.wikipedia.org/wiki/Unix_philosophy#Do_One_Thing_and_Do_It_Well) in
mind: do one thing, and do it well. It has no dependencies, compiles quickly, and is composed of only ~100 lines of
well-audited code.
## Behaviour
Pollster will synchronously block the thread until a future completes. It will not spin: instead, it will place the
thread into a waiting state until the future has been polled to completion.
## Compatibility
Unfortunately, `pollster` will not work for *all* futures because some require a specific runtime or reactor. See
[here](https://rust-lang.github.io/async-book/08_ecosystem/00_chapter.html#determining-ecosystem-compatibility) for more
information about when and where `pollster` may be used. However, if you're already pulling in the required dependencies
to create such a future in the first place, it's likely that you already have a version of `block_on` in your dependency
tree that's designed to poll your future, so use that instead.
## Macro
When using the `macro` crate feature, an attribute-macro can be used to mark `async fn main()`:
```rust,ignore
#[pollster::main]
async fn main() {
let my_fut = async {};
my_fut.await;
}
```
Additionally if you have re-exported the crate with a different name then `pollster`, you have to specify it:
```rust,ignore
#[pollster::main(crate = "renamed-pollster")]
async fn main() {
let my_fut = async {};
my_fut.await;
}
```
You can also use `#[pollster::test]` for tests.

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#![doc = include_str!("../README.md")]
use std::{
future::Future,
sync::{Arc, Condvar, Mutex},
task::{Context, Poll, Wake, Waker},
};
#[cfg(feature = "macro")]
pub use pollster_macro::{main, test};
/// An extension trait that allows blocking on a future in suffix position.
pub trait FutureExt: Future {
/// Block the thread until the future is ready.
///
/// # Example
///
/// ```
/// use pollster::FutureExt as _;
///
/// let my_fut = async {};
///
/// let result = my_fut.block_on();
/// ```
fn block_on(self) -> Self::Output where Self: Sized { block_on(self) }
}
impl<F: Future> FutureExt for F {}
enum SignalState {
Empty,
Waiting,
Notified,
}
struct Signal {
state: Mutex<SignalState>,
cond: Condvar,
}
impl Signal {
fn new() -> Self {
Self {
state: Mutex::new(SignalState::Empty),
cond: Condvar::new(),
}
}
fn wait(&self) {
let mut state = self.state.lock().unwrap();
match *state {
SignalState::Notified => {
// Notify() was called before we got here, consume it here without waiting and return immediately.
*state = SignalState::Empty;
return;
}
// This should not be possible because our signal is created within a function and never handed out to any
// other threads. If this is the case, we have a serious problem so we panic immediately to avoid anything
// more problematic happening.
SignalState::Waiting => {
unreachable!("Multiple threads waiting on the same signal: Open a bug report!");
}
SignalState::Empty => {
// Nothing has happened yet, and we're the only thread waiting (as should be the case!). Set the state
// accordingly and begin polling the condvar in a loop until it's no longer telling us to wait. The
// loop prevents incorrect spurious wakeups.
*state = SignalState::Waiting;
while let SignalState::Waiting = *state {
state = self.cond.wait(state).unwrap();
}
}
}
}
fn notify(&self) {
let mut state = self.state.lock().unwrap();
match *state {
// The signal was already notified, no need to do anything because the thread will be waking up anyway
SignalState::Notified => {}
// The signal wasnt notified but a thread isnt waiting on it, so we can avoid doing unnecessary work by
// skipping the condvar and leaving behind a message telling the thread that a notification has already
// occurred should it come along in the future.
SignalState::Empty => *state = SignalState::Notified,
// The signal wasnt notified and there's a waiting thread. Reset the signal so it can be wait()'ed on again
// and wake up the thread. Because there should only be a single thread waiting, `notify_all` would also be
// valid.
SignalState::Waiting => {
*state = SignalState::Empty;
self.cond.notify_one();
}
}
}
}
impl Wake for Signal {
fn wake(self: Arc<Self>) {
self.notify();
}
}
/// Block the thread until the future is ready.
///
/// # Example
///
/// ```
/// let my_fut = async {};
/// let result = pollster::block_on(my_fut);
/// ```
pub fn block_on<F: Future>(mut fut: F) -> F::Output {
// Pin the future so that it can be polled.
// SAFETY: We shadow `fut` so that it cannot be used again. The future is now pinned to the stack and will not be
// moved until the end of this scope. This is, incidentally, exactly what the `pin_mut!` macro from `pin_utils`
// does.
let mut fut = unsafe { std::pin::Pin::new_unchecked(&mut fut) };
// Signal used to wake up the thread for polling as the future moves to completion. We need to use an `Arc`
// because, although the lifetime of `fut` is limited to this function, the underlying IO abstraction might keep
// the signal alive for far longer. `Arc` is a thread-safe way to allow this to happen.
// TODO: Investigate ways to reuse this `Arc<Signal>`... perhaps via a `static`?
let signal = Arc::new(Signal::new());
// Create a context that will be passed to the future.
let waker = Waker::from(Arc::clone(&signal));
let mut context = Context::from_waker(&waker);
// Poll the future to completion
loop {
match fut.as_mut().poll(&mut context) {
Poll::Pending => signal.wait(),
Poll::Ready(item) => break item,
}
}
}

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use pollster;
use std::time::{Duration, Instant};
#[test]
fn basic() {
let make_fut = || std::future::ready(42);
// Immediately ready
assert_eq!(pollster::block_on(make_fut()), 42);
// Ready after a timeout
let then = Instant::now();
pollster::block_on(futures_timer::Delay::new(Duration::from_millis(250)));
assert!(Instant::now().duration_since(then) > Duration::from_millis(250));
}
#[test]
fn mpsc() {
use std::{
sync::atomic::{AtomicUsize, Ordering::SeqCst},
thread,
};
use tokio::sync::mpsc;
const BOUNDED: usize = 16;
const MESSAGES: usize = 100_000;
let (a_tx, mut a_rx) = mpsc::channel(BOUNDED);
let (b_tx, mut b_rx) = mpsc::channel(BOUNDED);
let thread_a = thread::spawn(move || {
pollster::block_on(async {
while let Some(msg) = a_rx.recv().await {
b_tx.send(msg).await.expect("send on b");
}
});
});
let thread_b = thread::spawn(move || {
pollster::block_on(async move {
for _ in 0..MESSAGES {
a_tx.send(()).await.expect("Send on a");
}
});
});
pollster::block_on(async move {
let sum = AtomicUsize::new(0);
while sum.fetch_add(1, SeqCst) < MESSAGES {
b_rx.recv().await;
}
assert_eq!(sum.load(SeqCst), MESSAGES + 1);
});
thread_a.join().expect("join thread_a");
thread_b.join().expect("join thread_b");
}