extern crate libc;

use std::mem::MaybeUninit;

fn main() {
    let mut steps = 0;
    loop {
        steps += 1;
        if steps < 100000 {
            continue;
        }
        steps = 0;
        let mut usage = MaybeUninit::<libc::rusage>::uninit();
        unsafe {
            assert_eq!(libc::getrusage(libc::RUSAGE_THREAD, usage.as_mut_ptr()), 0);
        }
        let usage = unsafe { usage.assume_init() }.ru_utime;
        let us = usage.tv_sec * 1_000_000 + usage.tv_usec;
        if us >= 500_000 {
            break;
        }
    }
}