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//! This module contains the functions for
//! forking binary sessions.

use crate::binary::struct_trait::session::Session;
use std::boxed::Box;
use std::error::Error;
use std::marker;
use std::panic;
use std::thread::{Builder, JoinHandle};

#[doc(hidden)]
pub fn fork_with_thread_id<S, P>(p: P) -> (JoinHandle<()>, S::Dual)
where
    S: Session + 'static,
    P: FnOnce(S) -> Result<(), Box<dyn Error>> + marker::Send + 'static,
{
    let (there, here) = Session::new();
    let other_thread = Builder::new()
        .name(String::from("Thread P"))
        .stack_size(32 * 1024 * 1024)
        .spawn(move || {
            panic::set_hook(Box::new(|_info| {
                // do nothing
            }));
            match p(there) {
                Ok(()) => (),
                Err(e) => panic!("{}", e.to_string()),
            }
        })
        .unwrap();
    (other_thread, here)
}

/// Creates a child process, and a session with two dual
/// endpoints of type `S` and `S::Dual`. The first endpoint
/// is given to the child process. Returns the
/// second endpoint.
pub fn fork<S, P>(p: P) -> S::Dual
where
    S: Session + 'static,
    P: FnOnce(S) -> Result<(), Box<dyn Error>> + marker::Send + 'static,
{
    fork_with_thread_id(p).1
}