Using Move Closure with Threads¶

We can use [[Move Closure]] to move data from one to another [[thread]].

use std::thread;
fn main() {
    let v = vec![1,2,3];
    let handle =  thread::spawn(||{
        println!("{:?}", v)
    });
    handle.join().unwrap();
}

This will throw a [[compile error]] closure may outlive the current function, but it borrows v, which is owned by current function. This means, that the thread may live as long as when the reference to v is no longer valid.

By using move keyword, we can force the [[closure]] to move the [[ownership]] of the values:

use std::thread;
fn main() {

    let v = vec![1,2,3];
    let handle =  thread::spawn(move || {
        println!("{:?}", v)
    });

    handle.join().unwrap();
}

✘ davis@davis-arch  ~/projects/rust   master  ./35-move-closure-with-threads
[1, 2, 3]