//
//  main.cpp
//  lab1
//
//  Created by Alik on 10/21/18.
//  Copyright © 2018 Oleksandr Vovkotrub. All rights reserved.
//

#include <fstream>
#include <iostream>
#include <future>
#include <string>

#include <sys/types.h>
#include <sys/stat.h>

#include <unistd.h>

#define let auto

using namespace std;

fstream create_pipe(string name) {
    mkfifo(name.c_str(), 666);
    return fstream { name };
}

future<int> read_pipe(fstream &pipe) {
    return async(launch::async, [&] {
        int result;
        pipe >> result;
        return result;
    });
}

int a(fstream &pipe) {
    sleep(3);
    pipe << 2;
    return 0;
}

int b(fstream &pipe) {
    sleep(3);
    pipe << 1;
    return 0;
}

int main() {
    let first_pipe = create_pipe("first_pipe");
    let second_pipe = create_pipe("second_pipe");

    let a_future = async(launch::async, a, ref(first_pipe));
    let b_future = async(launch::async, b, ref(second_pipe));

    let first_pipe_result = read_pipe(first_pipe);
    let second_pipe_result = read_pipe(second_pipe);

    cout << first_pipe_result.get() + second_pipe_result.get() << endl;
}