I have recently started with Rust and currently I don't have much knowledge on async,await,future in Rust. My code looks similar to below one and I'm stuck with an error which says future created by async block is not Send . I don't understand what is this error about and how to resolve it. Any help in resolving it?
#![allow(unused)]
use async_trait::async_trait;
use futures::prelude::*;
use std::error::Error;
//Assume these 2 lines are part module-1 to which currently I dont have the right to edit the code.
type JoinFuture = std::pin::Pin<Box<dyn Future<Output = Result<(), Box<dyn Error + Send + Sync>>>>>;
pub struct Logger{
var:Vec<JoinFuture>,
}
//below lines are part of module-2 in which I'm currently working on.
struct A{
logger : Logger,
}
#[async_trait]
trait Interface {
async fn setup(&mut self) ;
}
#[async_trait]
impl Interface for A {
//compilation error is pointing to below line
async fn setup(&mut self) {}
}
fn main() {
}
error: future cannot be sent between threads safely
--> src/main.rs:26:31
|
26 | async fn setup(&mut self) {}
| ^^ future created by async block is not `Send`
|
= help: the trait `std::marker::Send` is not implemented for `(dyn futures::Future<Output = Result<(), Box<(dyn std::error::Error + Sync + std::marker::Send + 'static)>>> + 'static)`
note: captured value is not `Send` because `&` references cannot be sent unless their referent is `Sync`
--> src/main.rs:26:25
|
26 | async fn setup(&mut self) {}
| ^^^^ has type `&mut A` which is not `Send`, because `A` is not `Sync`
= note: required for the cast to the object type `dyn futures::Future<Output = ()> + std::marker::Send`
error: could not compile `_test` due to previous error