C++ Boost ASIO simple periodic timer?

Question

I want a very simple periodic timer to call my code every 50ms. I could make a thread that sleeps for 50ms all the time (but that's a pain)... I could start looking into Linux API's for making timers (but it's not portable)...

I'd like to use boost.. I'm just not sure it's possible. Does boost provide this functionality?

Answer 1

A very simple, but fully functional example:

#include <iostream> #include <boost/asio.hpp>  boost::asio::io_service io_service; boost::posix_time::seconds interval(1);  // 1 second boost::asio::deadline_timer timer(io_service, interval);  void tick(const boost::system::error_code& /*e*/) {      std::cout << "tick" << std::endl;      // Reschedule the timer for 1 second in the future:     timer.expires_at(timer.expires_at() + interval);     // Posts the timer event     timer.async_wait(tick); }  int main(void) {      // Schedule the timer for the first time:     timer.async_wait(tick);     // Enter IO loop. The timer will fire for the first time 1 second from now:     io_service.run();     return 0; } 

Notice that it is very important to call expires_at() to set a new expiration time, otherwise the timer will fire immediately because it's current due time already expired.

Answer 2

The second example on Boosts Asio tutorials explains it.
You can find it here.

After that, check the 3rd example to see how you can call it again with a periodic time intervall