Home / Questions / 442843
Accepted
GirkovArpa
Asked: 2022-04-09 19:46:00 +0800 CST 2022-04-09 19:46:00 +0800 CST

Can a static numeric variable be corrupted?

  • 772

Is it possible that the last line shows any number other than 1337or 0due to a race condition?

static mut FOO: i32 = 1337;
// en hilo 1
unsafe { FOO = 0; }
// en hilo 2
unsafe { println!("{}", FOO); }

I imagine it FOOcould be read while writing, when only a few bits have been updated, if the operations are performed in different threads.

hilos

1 Answers

  1. Best Answer

    If possible. Whenever you work with multithreading, it is recommended to use Atomic.

    static mut FOO: AtomicI32 = AtomicI32::new(5);

fn main() {

    unsafe { 
        FOO = AtomicI32::new(50);
    }
    unsafe {
        println!("{}", *FOO.get_mut());
    }
}

    rust doc

    • 2