mirror of https://github.com/fafhrd91/actix-net
61 lines
2.0 KiB
Rust
61 lines
2.0 KiB
Rust
//! 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();
|
|
}
|