source: experimental/Threading/Timer/main.cpp @ 430

// Timer Test

#define _WIN32_WINNT  0x0601

// OSG includes
#include <osg/Notify>
#include <osg/Timer>
#include <boost/asio.hpp>
#include <boost/thread.hpp>



using namespace std;

class timed_class
{
public:
  timed_class(boost::asio::io_service& io_service) : _timer(io_service), i(0), timer(*osg::Timer::instance())
  {
        last_tick = timer.tick();

    // now schedule the first timer.

    _timer.expires_from_now(boost::posix_time::milliseconds(1000/60)); // runs with 60Hz
    _timer.async_wait(boost::bind(&timed_class::handle_timeout, this, boost::asio::placeholders::error));
  }

  void handle_timeout(boost::system::error_code const& cError)
  {
    if (cError.value() == boost::asio::error::operation_aborted)
      return;

    if (cError && cError.value() != boost::asio::error::operation_aborted)
      return; // throw an exception?

        // Schedule the timer again...
    _timer.expires_from_now(boost::posix_time::milliseconds(1000/60)); // runs with 60Hz
    _timer.async_wait(boost::bind(&timed_class::handle_timeout, this, boost::asio::placeholders::error));


        // Payload
        osg::Timer_t currentTick = timer.tick();
        cout << timer.delta_m(last_tick,currentTick) << " msec ("<<(1000/60)<<")" << endl;
        last_tick = timer.tick();
  }

private:
  boost::asio::deadline_timer _timer;
  boost::asio::basic_deadline_timer<> _timer;
  int i;
  const osg::Timer& timer;
  osg::Timer_t last_tick;
};



int main( int argc, char **argv )
{
        boost::asio::io_service io_service;

        timed_class t(io_service);

        //io_service.run();     // Start ioService in this thread( blocking

        // Start Timer in another thread to continue this thread
        boost::thread thread(boost::bind(&boost::asio::io_service::run, &io_service));

        // OUtput stuff to show th thread is working
        while(1)
                //OSG_ALWAYS<<"Main Thread:"<<i<<std::endl;
                OSG_ALWAYS<<"";

    return 0;
}