#include <iostream>
#include <memory>
#include <boost/asio/io_service.hpp>
#include <boost/bind.hpp>
#include <boost/thread/thread.hpp>

void print() {
    std::cout << "print" << std::endl;
}

struct ThreadPool
{
    void start()
    {
        boost::asio::io_service ioService;
        boost::thread_group threadpool;
        std::unique_ptr<boost::asio::io_service::work> work = std::make_unique<boost::asio::io_service::work>(ioService);
        threadpool.create_thread(boost::bind(&boost::asio::io_service::run, &ioService));

        for (int i=0; i<100; ++i)
        {
            ioService.post(&print);
        }
        std::cout << "Post all calculation tasks" << std::endl;
        
        work.reset();
        threadpool.join_all();
        ioService.stop();
        std::cout  << "Finished all calculation tasks" << std::endl;
    }
};

extern "C" void createthreadpool()
{
    ThreadPool pool;
    pool.start();
}