async fn main() { let start = std::time::Instant::now(); stream::iter(1..=50000) .map(|i| async move { print_with_delay(i).await }) .buffer_unordered(CONCURRENT_LIMIT) .collect::<Vec<()>>() .await; let duration
Async/Await 前面说到Rust异步的实现和生成器的实现很像,都需要保存状态,都会分阶段运行,不同之处在于async/await实现了跨保存点引用,具体实现方式则是指针+Pin;而是用Pin的原因很简单,因为指针会产生自引用类型,需要Pin保证自引用类型的有效性。 在异步中,当触发保存点保存上下文时,如果出现了引用,则改为裸指针处...
use crossbeam::channel;use once_cell::sync::Lazy;staticQUEUE:Lazy<channel::Sender<Arc<Task>>>=Lazy::new(||{let(sender,receiver)=channel::unbounded::<Arc<Task>>();for_in0..num_cpus::get().max(1){letreceiver=receiver.clone();thread::spawn(move||receiver.iter().for_each(|task|task...
thread::spawn(move || receiver.iter().for_each(|task| task.run())); } sender }); type Task = async_task::Task<()>; type JoinHandle<R> = Pin<Box<dyn Future<Output = R> + Send>>; fn spawn<F, R>(future: F) -> JoinHandle<R> where F: Future<Output = R> + Send + 'st...
use rayon::iter::ParallelBridge;use rayon::prelude::ParallelIterator;use std::sync::mpsc::channel;fnmain(){letrx={let(tx,rx)=channel();(1..=3).into_iter().for_each(|i|{let_=tx.send(i);});rx};letmut output:Vec<i32>=rx.into_iter().par_bridge().collect();output.sort_unstab...
rust/library/core/src/async_iter/async_iter.rs 文件的作用是定义了一组特征(traits),用于支持异步迭代器(Async Iterator)。 在Rust中,异步迭代器用于处理异步操作产生的结果序列。与迭代器不同,异步迭代器是异步操作的概念,它在每次迭代时可能会暂停执行,等待异步操作完成后再继续下一次迭代。这对于处理IO、网络...
struct Hex(Vec<u8>);impl std::fmt::Display for Hex {fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {self.0.iter().try_for_each(|b| write!(f, "{:02x}", b))}}println!("{}", Hex((0..32).collect()));// => 000102030405060708090a0b0c0d0e0f...
Rust allows a program to iterate over any typeTin aforloop, as long asTimplements theIteratortrait. traitIterator{typeItem;fnnext(&mutself)->Option<Self::Item>; }traitIntoIteratorwhereSelf::IntoIter::Item ==Self::Item {typeItem;typeIntoIter:Iterator;fninto_iter(self)->Self::IntoIter; ...
// Each url is downloaded and saved in dedicated Tokio task. // Directory is created if it doesn't exist. let paths = response.save("./data").await?; paths .iter() .for_each(|path| println!("Image file path: {}", path.display())); Ok(()) }Scaled...
// Process each event. for event in events.iter() { if event.is_writable() { // socket可写,开始发送数据 } if event.is_readable() { // socket可读,开始接收数据 } // socket 关闭,退出循环 return Ok(()); } } 总的来说,这是完全基于异步事件通知的写法,和C/C++区别不是很大,异步代码对...