extern crate libc;
extern crate num_cpus;

use libc::{c_char, size_t};
use std::thread;
use std::fs::copy;

fn python_str_array_2_str_vec<T, U, V>(_: T, _: U) -> V {
    unimplemented!()
}

#[no_mangle]
pub extern "C" fn copyFiles(
    sources: *const *const c_char,
    destinies: *const *const c_char,
    array_len: size_t,
) {
    let src: Vec<&str> = python_str_array_2_str_vec(sources, array_len);
    let dst: Vec<&str> = python_str_array_2_str_vec(destinies, array_len);
    let mut iter = src.iter().zip(dst);
    let num_threads = num_cpus::get();
    let threads = (0..num_threads).map(|_| {
        thread::spawn(|| while let Some((s, d)) = iter.next() {
            copy(s, d);
        })
    });
    for t in threads {
        t.join();
    }
}

fn main() {}