环境：

macOS Sonoma Ver.14.0 (M1 mac) Rust Ver.1.65.0

我想要做什么：我想在多线程之间共享一个带有 [u8;128] 元素数组的 vec。我在分享时要执行的要求如下。

1. 整个 vec 必须可读
2. 能够重写特定 [u8; 的元素 [128] 输入向量
3. 能够插入 [u8; 类型的数据 128]进入向量

下面是我写的代码，不过这段代码读起来可以，但是有一个问题就是写的没有体现出来。如果我运行此代码，然后在执行该代码的计算机上运行以下命令一次

    nc -v 本地主机 50051

    [[0u8; 128],[1u8; 128],[2u8; 128]]

将被输出。到目前为止这是正确的，但第二次运行的数据输出与第一次运行相同。我的意图是第二个元素将输出具有 3 个填充的数据，如下所示，因为我正在第一次运行中更新数据。

    [[0u8; 128],[3u8; 128],[2u8; 128]]

我猜测我对 Arc 的使用是错误的，它实际上是传递 SharedData 的克隆，而不是对 SharedData 的引用，但我不知道如何识别这一点。如何修复代码以使其按我的预期工作？

主要.rs:

use std::net::SocketAddr;
use std::sync::Arc;
use std::sync::RwLock;
use std::time::Duration;
use tokio_task_pool::Pool;

struct SharedData {
    data: Arc<RwLock<Vec<[u8; 128]>>>
}

impl SharedData {
    fn new(data: RwLock<Vec<[u8; 128]>>) -> Self {
        Self {
            data: Arc::new(data)
        }
    }

    fn update(&self, index: usize, update_data: [u8; 128]) {
        let read_guard_for_array = self.data.read().unwrap();
        let write_lock = RwLock::new((*read_guard_for_array)[index]);
        let mut write_guard_for_item = write_lock.write().unwrap();
        *write_guard_for_item = update_data;
    }
}

fn socket_to_async_tcplistener(s: socket2::Socket) -> std::io::Result<tokio::net::TcpListener> {
    std::net::TcpListener::from(s).try_into()
}

async fn process(mut stream: tokio::net::TcpStream, db_arc: Arc<SharedData>) {
    let read_guard = db_arc.data.read().unwrap();
    println!("In process() read: {:?}", *read_guard);
    db_arc.update(1, [3u8; 128]);
}

async fn serve(_: usize, tcplistener_arc: Arc<tokio::net::TcpListener>, db_arc: Arc<SharedData>) {
    let task_pool_capacity = 10;

    let task_pool = Pool::bounded(task_pool_capacity)
        .with_spawn_timeout(Duration::from_secs(300))
        .with_run_timeout(Duration::from_secs(300));
    
    loop {
        let (stream, _) = tcplistener_arc.as_ref().accept().await.unwrap();
        let db_arc_clone = db_arc.clone();

        task_pool.spawn(async move {
            process(stream, db_arc_clone).await;
        }).await.unwrap();
    }
}

#[tokio::main]
async fn main() {
    let addr: std::net::SocketAddr = "0.0.0.0:50051".parse().unwrap();
    let soc2 = socket2::Socket::new(
        match addr {
            SocketAddr::V4(_) => socket2::Domain::IPV4,
            SocketAddr::V6(_) => socket2::Domain::IPV6,
        },
        socket2::Type::STREAM,
        Some(socket2::Protocol::TCP)
    ).unwrap();
    
    soc2.set_reuse_address(true).unwrap();
    soc2.set_reuse_port(true).unwrap();
    soc2.set_nonblocking(true).unwrap();
    soc2.bind(&addr.into()).unwrap();
    soc2.listen(8192).unwrap();

    let tcp_listener = Arc::new(socket_to_async_tcplistener(soc2).unwrap());

    let mut vec = vec![
        [0u8; 128],
        [1u8; 128],
        [2u8; 128],
    ];

    let share_db = Arc::new(SharedData::new(RwLock::new(vec)));
    let mut handlers = Vec::new();
    for i in 0..num_cpus::get() - 1 {
        let cloned_listener = Arc::clone(&tcp_listener);
        let db_arc = share_db.clone();

        let h = std::thread::spawn(move || {
            tokio::runtime::Builder::new_current_thread()
                .enable_all()
                .build()
                .unwrap()
                .block_on(serve(i, cloned_listener, db_arc));
        });
        handlers.push(h);
    }

    for h in handlers {
        h.join().unwrap();
    }
}

货物.toml：

[package]
name = "tokio-test"
version = "0.1.0"
edition = "2021"

[dependencies]
log = "0.4.20"
env_logger = "0.10.0"
tokio = { version = "1.34.0", features = ["full"] }
tokio-stream = { version = "0.1.14", features = ["net"] }
serde = { version = "1.0.193", features = ["derive"] }
serde_yaml = "0.9.27"
serde_derive = "1.0.193"
mio = {version="0.8.9", features=["net", "os-poll", "os-ext"]}
num_cpus = "1.16.0"
socket2 = { version="0.5.5", features = ["all"]}
array-macro = "2.1.8"
tokio-task-pool = "0.1.5"
argparse = "0.2.2"