rust Arc + Rwlock + Deref - 2021-03-17

目的:

有一个数据,需要获取新值,需要在其他线程中操作.

代码:

use std::{
    ops::Deref,
    sync::{Arc, RwLock},
};

#[derive(Debug, Clone)]
pub struct TestArc {
    inner: Arc,
}
impl Deref for TestArc {
    type Target = Arc;

    fn deref(&self) -> &Self::Target {
        &self.inner
    }
}

#[derive(Debug, Clone)]
pub struct TestArcInner {
    field1: Arc>,
}

impl TestArcInner {
    pub fn change(&self,new_val:i32) {
        let mut w = self.field1.write().unwrap();
        *w = new_val;
    }
}

fn main() {
    let test1 = TestArc {
        inner: Arc::new(TestArcInner {
            field1: Arc::new(RwLock::new(1)),
        }),
    };

    let test2 = test1.clone();

    let handle = std::thread::spawn(move||{
        test2.change(2);
        println!("==========\n2:{:#?}",test2);
    });

    handle.join().unwrap();

    println!("==========\n1:{:#?}\n==========", test1);
}

输出:

[ra@ubuntu test-arc]$ cargo run
   Compiling test-arc v0.1.0 (/src/rust/test-arc)
    Finished dev [unoptimized + debuginfo] target(s) in 0.36s
     Running `target/debug/test-arc`
==========
2:TestArc {
    inner: TestArcInner {
        field1: RwLock {
            data: 2,
        },
    },
}
==========
1:TestArc {
    inner: TestArcInner {
        field1: RwLock {
            data: 2,
        },
    },
}
==========
[ra@ubuntu test-arc]$