actix-rt: Provide custom tokio::runtime::Runtime

[oblique]

Is there a way to provide a custom a tokio::runtime::Runtime? The only way I found is actix_rt::System::with_tokio_rt but it is hidden from documentation.

[robjtede]

actix_rt::System::with_tokio_rt is the correct way to do this.

[oblique]

I don't want to rely on a hidden API. Is there a reason that is hidden? Can we have it as a non-hidden public API?

[robjtede]

when actix-server comes out of beta, the hidden annotation will be removed. at this point it's very unlikely to change

[oblique]

Ok, thanks!

[brandonros]

Brandons-MacBook-Air:diag-rust brandonros 2022-02-22 12:53:28 $ cargo build
   Compiling j2534-http-diag v0.0.1 (/Users/brandonros/Desktop/j2534-http/diag-rust)
warning: unused `#[macro_use]` import
 --> src/lib.rs:3:1
  |
3 | #[macro_use]
  | ^^^^^^^^^^^^
  |
  = note: `#[warn(unused_imports)]` on by default

warning: unused import: `awc::Client`
  --> src/lib.rs:12:5
   |
12 | use awc::Client;
   |     ^^^^^^^^^^^

error[E0277]: `*const ()` cannot be sent between threads safely
  --> src/lib.rs:14:1
   |
14 | / lazy_static! {
15 | |   static ref runtime: tokio::runtime::Runtime = tokio::runtime::Runtime::new().unwrap();
16 | |   static ref system_tuner: Mutex<actix_rt::SystemRunner> = Mutex::new(actix_rt::System::with_tokio_rt(runtime));
17 | |   //static ref runtime_mutex: Mutex<tokio::runtime::Runtime> = Mutex::new(tokio::runtime::Runtime::new().unwrap());
18 | | }
   | |_^ `*const ()` cannot be sent between threads safely
   |
   = help: within `SystemRunner`, the trait `std::marker::Send` is not implemented for `*const ()`
   = note: required because it appears within the type `PhantomData<*const ()>`
   = note: required because it appears within the type `LocalSet`
   = note: required because it appears within the type `actix_rt::Runtime`
   = note: required because it appears within the type `SystemRunner`
   = note: required because of the requirements on the impl of `Sync` for `std::sync::Mutex<SystemRunner>`
note: required by a bound in `lazy_static::lazy::Lazy`
  --> /Users/brandonros/.cargo/registry/src/github.com-1ecc6299db9ec823/lazy_static-1.4.0/src/inline_lazy.rs:19:20
   |
19 | pub struct Lazy<T: Sync>(Cell<Option<T>>, Once);
   |                    ^^^^ required by this bound in `lazy_static::lazy::Lazy`
   = note: this error originates in the macro `__lazy_static_create` (in Nightly builds, run with -Z macro-backtrace for more info)

For more information about this error, try `rustc --explain E0277`.
warning: `j2534-http-diag` (lib) generated 2 warnings
error: could not compile `j2534-http-diag` due to previous error; 2 warnings emitted
Brandons-MacBook-Air:diag-rust brandonros 2022-02-22 12:53:57 $ 

//#![cfg(windows)]

#[macro_use]
extern crate tokio;
extern crate winapi;
extern crate awc;
#[macro_use]
extern crate lazy_static;

use std::sync::Mutex;
use std::os::raw::{c_char, c_void};
use awc::Client;

lazy_static! {
  static ref runtime: tokio::runtime::Runtime = tokio::runtime::Runtime::new().unwrap();
  static ref system_tuner: Mutex<actix_rt::SystemRunner> = Mutex::new(actix_rt::System::with_tokio_rt(runtime));
  //static ref runtime_mutex: Mutex<tokio::runtime::Runtime> = Mutex::new(tokio::runtime::Runtime::new().unwrap());
}

Any recommendations on how to use actix_rt / tokio from a dylib/library/DLL context?