Function set_blocking_executor 

pub fn set_blocking_executor(
    executor: impl BlockingExecutor,
) -> Result<(), Box<dyn BlockingExecutor>>

Available on crate feature async only.

Installs the blocking executor, once per process.

use dynamic_config::BlockingExecutor;

struct Threads;

impl BlockingExecutor for Threads {
    fn execute(&self, work: Box<dyn FnOnce() + Send + 'static>) {
        // `async_std::task::spawn_blocking(work)` and `smol::unblock`
        // slot in here just as well.
        std::thread::spawn(work);
    }
}

// Once per process; a second call reports that one is already installed.
let _ = dynamic_config::set_blocking_executor(Threads);

Errors

If one is already installed. The rejected executor is returned rather than dropped, so a caller that wants to can tell “already set” from “failed”.