source: benchmark/schedint/rust.rs@ 73f4d08

use std::env;
use std::process;
use std::thread;
use std::sync::{Arc, Mutex, Condvar};
use std::time::Instant;

fn main() {
        let mut times : u32 = 500000;
        let args: Vec<String> = env::args().collect();
        if args.len() > 2 { process::exit( 1 ); }
        if args.len() == 2 { times = args[1].parse().unwrap(); }

        let m = Arc::new(Mutex::new(0));
        let c = Arc::new(Condvar::new());

        let m2 = Arc::clone(&m);
        let c2 = Arc::clone(&c);

        let th = thread::spawn( move || {
                while *m2.lock().unwrap() == 0 { // waiter must start first
                        thread::yield_now();
                }
                let start = Instant::now();
                while *m2.lock().unwrap() == 1 {
                        c2.notify_one();
                }
                let duration = start.elapsed() / times;
                println!( "{:?}", duration.as_nanos() );
        });
        {
                let mut sc = m.lock().unwrap();
                *sc = 1;
                for _ in 1..times {
                        sc = c.wait(sc).unwrap();
                }
                *sc = 0;
        }
        th.join().unwrap();
}

// Local Variables: //
// tab-width: 4 //
// compile-command: "rustc -C opt-level=3 rust.rs" //
// End: //