feat: add README.md
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__concurrent/async_study/README.md
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__concurrent/async_study/README.md
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Import `tokio`:
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```
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tokio = { version = "1.0", features = ["full"] }
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```
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Usage:
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```rust
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#[tokio::main]
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async fn main() {
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// TODO ...
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}
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```
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`tokio` 提供以下几种 channels 类型:
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* mpsc: 多生产者,单消费者 - https://docs.rs/tokio/1/tokio/sync/mpsc/index.html
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* oneshot: 单生产者,单消费者 - https://docs.rs/tokio/1/tokio/sync/oneshot/index.html
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* broadcast: 多生产者,多消费者 - https://docs.rs/tokio/1/tokio/sync/broadcast/index.html
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* watch: 单生产者,多消费者 - https://docs.rs/tokio/1/tokio/sync/watch/index.html
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__concurrent/async_study/examples/async4.rs
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__concurrent/async_study/examples/async4.rs
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fn main() {
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let rt = tokio::runtime::Runtime::new().unwrap();
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rt.block_on(async {
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invoke().await
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});
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}
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async fn invoke() {
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println!("Hello World!");
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}
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