如何释放由 WebAssembly 中公开的 Rust 代码分配的内存?

本文介绍了如何释放由 WebAssembly 中公开的 Rust 代码分配的内存?的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

我有一个用 Rust 和 wasm-bindgen 编写的 Web 应用程序，需要存储状态.状态存储如下:

I have a web application written in Rust and wasm-bindgen that needs to store state. The state is stored like this:

lazy_static! {
    static ref ID_TO_DATA: Mutex<HashMap<u32, Data>> = Mutex::new(HashMap::new());
}

pub struct Data {
    pub coder_id: u16,
    pub bools: Vec<bool>,
    pub ints: Vec<i32>,
    pub strings: Vec<String>,
}

我尝试了以下删除数据并释放内存，并且数据从HashMap中删除并且没有报告错误:

I attempted the following to remove the data and free the memory, and the data is removed from the HashMap and no errors are reported:

#[wasm_bindgen]
pub fn remove_data(id: u32) {
    match ID_TO_DATA.lock().unwrap().remove(&id) {
        Some(data) => {
            std::mem::drop(data);
        }
        None => {}
    }
}

然而，浏览器标签使用的内存永远不会下降(使用 Chrome 67).我使用 Windows 的任务管理器，看到相关进程/选项卡的内存增长到近 2GB，然后在我的程序删除所有条目后，我等了一分钟，内存仍然接近 2GB.

However, the memory used by the browser tab never drops (using Chrome 67). I used Windows' Task Manager and watched the memory grow to almost 2GB for the relevant process/tab, and then after my program removed all the entries, I waited a minute and the memory was still at almost 2GB.

我也尝试了以下方法，但得到了这个错误:RuntimeError: memory access out of bounds

I also tried the following, but got this error: RuntimeError: memory access out of bounds

#[wasm_bindgen]
pub fn remove_data(id: u32) {
    match ID_TO_DATA.lock().unwrap().remove(&id) {
        Some(mut data) => {
            unsafe {
                std::ptr::drop_in_place(&mut data);
            }
        }
        None => {}
    }
}

我怎样才能成功释放这个内存?

How can I successfully free this memory?

如何释放由

如何释放由 WebAssembly 中公开的 Rust 代码分配的内存?

问题描述

推荐答案