CS452 Lab04 - Sample 3 (Rust)

sample3.rs

use nix::unistd::sleep;
use std::thread;

// Global variable
static mut SHARED_DATA: u8 = 5;

fn main() {
  // Use lambda when the thread function takes arguments
  let thr1 = thread::spawn(|| do_greeting3('a'));
  let thr2 = thread::spawn(|| do_greeting3('b'));

  unsafe {
    println!("Parent sees {}", SHARED_DATA);
    SHARED_DATA += 1;
  }
  thr1.join().expect("Can't join");
  thr2.join().expect("Can't join");
  unsafe {
    println!("Parent sees {}", SHARED_DATA);
  }
}

fn do_greeting3(arg: char) {
  unsafe {
    println!("Child receiving {} initially sees {}", arg, SHARED_DATA);
    sleep(1);
    SHARED_DATA += 1;
    println!("Child receiving {} now sees {}", arg, SHARED_DATA);
  }
}