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#![allow(unknown_lints, unexpected_cfgs)]
#![warn(rust_2018_idioms)]
#![cfg(all(feature = "full", not(target_os = "wasi"), target_has_atomic = "64"))]
use tokio::runtime::Runtime;
#[test]
fn num_workers() {
let rt = current_thread();
assert_eq!(1, rt.metrics().num_workers());
let rt = threaded();
assert_eq!(2, rt.metrics().num_workers());
}
#[test]
fn num_alive_tasks() {
let rt = current_thread();
let metrics = rt.metrics();
assert_eq!(0, metrics.num_alive_tasks());
rt.block_on(rt.spawn(async move {
assert_eq!(1, metrics.num_alive_tasks());
}))
.unwrap();
assert_eq!(0, rt.metrics().num_alive_tasks());
let rt = threaded();
let metrics = rt.metrics();
assert_eq!(0, metrics.num_alive_tasks());
rt.block_on(rt.spawn(async move {
assert_eq!(1, metrics.num_alive_tasks());
}))
.unwrap();
// try for 10 seconds to see if this eventually succeeds.
// wake_join() is called before the task is released, so in multithreaded
// code, this means we sometimes exit the block_on before the counter decrements.
for _ in 0..100 {
if rt.metrics().num_alive_tasks() == 0 {
break;
}
std::thread::sleep(std::time::Duration::from_millis(100));
}
assert_eq!(0, rt.metrics().num_alive_tasks());
}
fn current_thread() -> Runtime {
tokio::runtime::Builder::new_current_thread()
.enable_all()
.build()
.unwrap()
}
fn threaded() -> Runtime {
tokio::runtime::Builder::new_multi_thread()
.worker_threads(2)
.enable_all()
.build()
.unwrap()
}