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add example of using multi-thread tokio runtime (#294)
* add example of using multi-thread tokio runtime * Update multi_thread_system.rs Co-authored-by: Rob Ede <robjtede@icloud.com>
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//! An example on how to build a multi-thread tokio runtime for Actix System. | ||
//! Then spawn async task that can make use of work stealing of tokio runtime. | ||
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use actix_rt::System; | ||
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fn main() { | ||
System::with_tokio_rt(|| { | ||
// build system with a multi-thread tokio runtime. | ||
tokio::runtime::Builder::new_multi_thread() | ||
.worker_threads(2) | ||
.enable_all() | ||
.build() | ||
.unwrap() | ||
}) | ||
.block_on(async_main()); | ||
} | ||
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// async main function that acts like #[actix_web::main] or #[tokio::main] | ||
async fn async_main() { | ||
let (tx, rx) = tokio::sync::oneshot::channel(); | ||
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// get a handle to system arbiter and spawn async task on it | ||
System::current().arbiter().spawn(async { | ||
// use tokio::spawn to get inside the context of multi thread tokio runtime | ||
let h1 = tokio::spawn(async { | ||
println!("thread id is {:?}", std::thread::current().id()); | ||
std::thread::sleep(std::time::Duration::from_secs(2)); | ||
}); | ||
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// work stealing occurs for this task spawn | ||
let h2 = tokio::spawn(async { | ||
println!("thread id is {:?}", std::thread::current().id()); | ||
}); | ||
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h1.await.unwrap(); | ||
h2.await.unwrap(); | ||
let _ = tx.send(()); | ||
}); | ||
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rx.await.unwrap(); | ||
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let (tx, rx) = tokio::sync::oneshot::channel(); | ||
let now = std::time::Instant::now(); | ||
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// without additional tokio::spawn, all spawned tasks run on single thread | ||
System::current().arbiter().spawn(async { | ||
println!("thread id is {:?}", std::thread::current().id()); | ||
std::thread::sleep(std::time::Duration::from_secs(2)); | ||
let _ = tx.send(()); | ||
}); | ||
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// previous spawn task has blocked the system arbiter thread | ||
// so this task will wait for 2 seconds until it can be run | ||
System::current().arbiter().spawn(async move { | ||
println!("thread id is {:?}", std::thread::current().id()); | ||
assert!(now.elapsed() > std::time::Duration::from_secs(2)); | ||
}); | ||
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rx.await.unwrap(); | ||
} |