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#### Source listing for Timer.5

    //
    // timer.cpp
    // ~~~~~~~~~
    //
    // Copyright (c) 2003-2012 Christopher M. Kohlhoff (chris at kohlhoff dot com)
    //
    // Distributed under the Boost Software License, Version 1.0. (See accompanying
    // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
    //

    #include <iostream>
    #include <boost/asio.hpp>
    #include <boost/thread/thread.hpp>
    #include <boost/bind.hpp>
    #include <boost/date_time/posix_time/posix_time.hpp>

    class printer
    {
    public:
      printer(boost::asio::io_service& io)
        : strand_(io),
          timer1_(io, boost::posix_time::seconds(1)),
          timer2_(io, boost::posix_time::seconds(1)),
          count_(0)
      {
        timer1_.async_wait(strand_.wrap(boost::bind(&printer::print1, this)));
        timer2_.async_wait(strand_.wrap(boost::bind(&printer::print2, this)));
      }

      ~printer()
      {
        std::cout << "Final count is " << count_ << "\n";
      }

      void print1()
      {
        if (count_ < 10)
        {
          std::cout << "Timer 1: " << count_ << "\n";
          ++count_;

          timer1_.expires_at(timer1_.expires_at() + boost::posix_time::seconds(1));
          timer1_.async_wait(strand_.wrap(boost::bind(&printer::print1, this)));
        }
      }

      void print2()
      {
        if (count_ < 10)
        {
          std::cout << "Timer 2: " << count_ << "\n";
          ++count_;

          timer2_.expires_at(timer2_.expires_at() + boost::posix_time::seconds(1));
          timer2_.async_wait(strand_.wrap(boost::bind(&printer::print2, this)));
        }
      }

    private:
      boost::asio::strand strand_;
      boost::asio::deadline_timer timer1_;
      boost::asio::deadline_timer timer2_;
      int count_;
    };

    int main()
    {
      boost::asio::io_service io;
      printer p(io);
      boost::thread t(boost::bind(&boost::asio::io_service::run, &io));
      io.run();
      t.join();

      return 0;
    }

Return to Timer.5 - Synchronising handlers in multithreaded programs