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<pre class="programlisting">//
// timer.cpp
// ~~~~~~~~~
//
// Copyright (c) 2003-2020 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 &lt;iostream&gt;
#include &lt;asio.hpp&gt;
#include &lt;boost/bind/bind.hpp&gt;

class printer
{
public:
  printer(asio::io_context&amp; io)
    : strand_(asio::make_strand(io)),
      timer1_(io, asio::chrono::seconds(1)),
      timer2_(io, asio::chrono::seconds(1)),
      count_(0)
  {
    timer1_.async_wait(asio::bind_executor(strand_,
          boost::bind(&amp;printer::print1, this)));

    timer2_.async_wait(asio::bind_executor(strand_,
          boost::bind(&amp;printer::print2, this)));
  }

  ~printer()
  {
    std::cout &lt;&lt; "Final count is " &lt;&lt; count_ &lt;&lt; std::endl;
  }

  void print1()
  {
    if (count_ &lt; 10)
    {
      std::cout &lt;&lt; "Timer 1: " &lt;&lt; count_ &lt;&lt; std::endl;
      ++count_;

      timer1_.expires_at(timer1_.expiry() + asio::chrono::seconds(1));

      timer1_.async_wait(asio::bind_executor(strand_,
            boost::bind(&amp;printer::print1, this)));
    }
  }

  void print2()
  {
    if (count_ &lt; 10)
    {
      std::cout &lt;&lt; "Timer 2: " &lt;&lt; count_ &lt;&lt; std::endl;
      ++count_;

      timer2_.expires_at(timer2_.expiry() + asio::chrono::seconds(1));

      timer2_.async_wait(asio::bind_executor(strand_,
            boost::bind(&amp;printer::print2, this)));
    }
  }

private:
  asio::strand&lt;asio::io_context::executor_type&gt; strand_;
  asio::steady_timer timer1_;
  asio::steady_timer timer2_;
  int count_;
};

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

  return 0;
}
</pre>
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<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
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<td align="right"><div class="copyright-footer">Copyright © 2003-2020 Christopher M.
      Kohlhoff<p>
        Distributed under the Boost Software License, Version 1.0. (See accompanying
        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
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