raii

use std::os::raw::c_int;

pub const LOCK_EX: c_int = 2;
pub const LOCK_NB: c_int = 4;
pub const LOCK_UN: c_int = 8;

use async_trait::async_trait;
use std::io;

#[async_trait]
pub trait ConnectionFactory: Send + Sync + 'static {
    type Connection: Send + 'static;