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multi_thread_system.rs
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multi_thread_system.rs
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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.
use actix_rt::System;
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());
}
// async main function that acts like #[actix_web::main] or #[tokio::main]
async fn async_main() {
let (tx, rx) = tokio::sync::oneshot::channel();
// 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));
});
// work stealing occurs for this task spawn
let h2 = tokio::spawn(async {
println!("thread id is {:?}", std::thread::current().id());
});
h1.await.unwrap();
h2.await.unwrap();
let _ = tx.send(());
});
rx.await.unwrap();
let (tx, rx) = tokio::sync::oneshot::channel();
let now = std::time::Instant::now();
// 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(());
});
// 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));
});
rx.await.unwrap();
}