多io_service，多線程run，相當于多個線程分別處理注冊在不同io_service上的回調，也就是每個線程排某個io_service的異步處理：
//mio_mth.cpp
#include <boost/asio.hpp>
#include <boost/date_time/posix_time/posix_time_types.hpp>
#include <iostream>
#include <chrono>
#include <thread>
#include <functional>
using namespace boost::asio;
using namespace std;thread_local int t_id = 0;
unsigned long getTimestamp()
{return std::chrono::system_clock::now().time_since_epoch().count()/std::chrono::system_clock::period::den;
}void timer_handler(int timerID, const boost::system::error_code& err)
{if (err){cout << getTimestamp() << " Timer cancel" << endl;return;}cout << getTimestamp() <<" t_id:" << t_id << " timerID:" << timerID << " " << " Timer on"<<endl;if(t_id == 1)
)
