Struct RequestGuard 

pub struct RequestGuard<'a, Req, Resp>
where
    Req: Send,
    Resp: Send,
{ /* private fields */ }

Request guard that enforces B must reply

This guard ensures that B must call reply() before dropping the guard. If the guard is dropped without replying, it will panic to prevent A from deadlocking.

强制 B 必须回复的 Guard

这个 guard 确保 B 必须在丢弃 guard 之前调用 reply()。 如果 guard 在没有回复的情况下被丢弃，会 panic 以防止 A 死锁。

Implementations

impl<'a, Req, Resp> RequestGuard<'a, Req, Resp>

where Req: Send, Resp: Send,

pub fn request(&self) -> &Req

Get a reference to the request

获取请求内容的引用

pub fn reply(self, resp: Resp)

Consume the guard and send reply

This method will:

1. Store the response
2. Update state to RESPONSE_READY
3. Wake up side A

消耗 Guard 并发送回复

这个方法会：

1. 存储响应
2. 更新状态为 RESPONSE_READY
3. 唤醒 A 方

Trait Implementations

impl<'a, Req, Resp> Debug for RequestGuard<'a, Req, Resp>

where Req: Send + Debug, Resp: Send,

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl<'a, Req, Resp> Drop for RequestGuard<'a, Req, Resp>

where Req: Send, Resp: Send,

Drop guard: If B drops the guard without calling reply, we panic. This enforces the “must reply” protocol.

Drop 守卫：如果 B 不调用 reply 就丢弃了 Guard，我们会 panic。 这强制执行了 “必须回复” 的协议。

fn drop(&mut self)

Executes the destructor for this type.

impl<'a, Req, Resp> PartialEq for RequestGuard<'a, Req, Resp>

where Req: Send + PartialEq, Resp: Send,

fn eq(&self, other: &Self) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.