Question

How to create an infinite loop that runs with a delay in Rust

Answer 1

use std::thread::sleep;
use std::time::{Duration, Instant};

fn main() {

    let interval = Duration::from_secs(1);
    let mut next_time = Instant::now() + interval;
    loop {
        println!("{:?}", next_time); 
        sleep(next_time - Instant::now());
        next_time += interval;
    }
}

   
   
/*
run:

Instant { tv_sec: 874827, tv_nsec: 359199172 }
Instant { tv_sec: 874828, tv_nsec: 359199172 }
Instant { tv_sec: 874829, tv_nsec: 359199172 }
Instant { tv_sec: 874830, tv_nsec: 359199172 }
Instant { tv_sec: 874831, tv_nsec: 359199172 }
Instant { tv_sec: 874832, tv_nsec: 359199172 }
Instant { tv_sec: 874833, tv_nsec: 359199172 }
Instant { tv_sec: 874834, tv_nsec: 359199172 }
Instant { tv_sec: 874835, tv_nsec: 359199172 }
Instant { tv_sec: 874836, tv_nsec: 359199172 }
Instant { tv_sec: 874837, tv_nsec: 359199172 }
Instant { tv_sec: 874838, tv_nsec: 359199172 }
Instant { tv_sec: 874839, tv_nsec: 359199172 }
Instant { tv_sec: 874840, tv_nsec: 359199172 }
Instant { tv_sec: 874841, tv_nsec: 359199172 }
Instant { tv_sec: 874842, tv_nsec: 359199172 }
Instant { tv_sec: 874843, tv_nsec: 359199172 }
Instant { tv_sec: 874844, tv_nsec: 359199172 }
Instant { tv_sec: 874845, tv_nsec: 359199172 }
Instant { tv_sec: 874846, tv_nsec: 359199172 }
Instant { tv_sec: 874847, tv_nsec: 359199172 }
Instant { tv_sec: 874848, tv_nsec: 359199172 }
Instant { tv_sec: 874849, tv_nsec: 359199172 }
Instant { tv_sec: 874850, tv_nsec: 359199172 }
Instant { tv_sec: 874851, tv_nsec: 359199172 }
Instant { tv_sec: 874852, tv_nsec: 359199172 }
Instant { tv_sec: 874853, tv_nsec: 359199172 }
Instant { tv_sec: 874854, tv_nsec: 359199172 }
Instant { tv_sec: 874855, tv_nsec: 359199172 }
Instant { tv_sec: 874856, tv_nsec: 359199172 }
Instant { tv_sec: 874857, tv_nsec: 359199172 }
Instant { tv_sec: 874858, tv_nsec: 359199172 }
Instant { tv_sec: 874859, tv_nsec: 359199172 }
Instant { tv_sec: 874860, tv_nsec: 359199172 }
Instant { tv_sec: 874861, tv_nsec: 359199172 }
Instant { tv_sec: 874862, tv_nsec: 359199172 }
Instant { tv_sec: 874863, tv_nsec: 359199172 }
Instant { tv_sec: 874864, tv_nsec: 359199172 }
Instant { tv_sec: 874865, tv_nsec: 359199172 }
Instant { tv_sec: 874866, tv_nsec: 359199172 }
Instant { tv_sec: 874867, tv_nsec: 359199172 }
Instant { tv_sec: 874868, tv_nsec: 359199172 }

*/

 

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