#![warn(rust_2018_idioms)]

use tokio::task;

use std::env;
use std::process;
use std::time::Instant;

#[tokio::main]
async fn main() {
	let mut times : u32 = 50000000;
	let args: Vec<String> = env::args().collect();
	if args.len() > 2 { process::exit( 1 ); }
	if args.len() == 2 { times = args[1].parse().unwrap(); }

	let start = Instant::now();
	for _ in 1..times {
		task::yield_now().await;
	}
	let duration = start.elapsed() / times;
	println!( "{:?}", duration.as_nanos() )
}

// ~/software/rust/tokio/src/main.rs
// ~/software/rust/tokio/target/release/tokio
// $ cargo build --release
// % tokio

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