boost deadline_timer issue - c++

Question

Here follows the implementation of a test class wrapping a thread with a timer.
The strange thing is that if the deadline is set to 500 milliseconds it works but if I set it to 1000 milliseconds it does not. What am I doing wrong?
#include "TestTimer.hpp"
#include "../SysMLmodel/Package1/Package1.hpp"
TestTimer::TestTimer(){
thread = boost::thread(boost::bind(&TestTimer::classifierBehavior,this));
timer = new boost::asio::deadline_timer(service,boost::posix_time::milliseconds(1000));
timer->async_wait(boost::bind(&TestTimer::timerBehavior, this));
};
TestTimer::~TestTimer(){
}
void TestTimer::classifierBehavior(){
service.run();
};
void TestTimer::timerBehavior(){
std::cout<<"timerBehavior\r";
timer->expires_at(timer->expires_at() + boost::posix_time::milliseconds(1000));
timer->async_wait(boost::bind(&TestTimer::timerBehavior,this));
}
UPDATE 1
I have noticed that the program stucks (or at least the standard output in the console for many seconds, about 30) then a lot of "timerBehavior" strings are printed out together as if they have been queued somewhere.

Answer 1

You program might have several problems. From what you have shown, it's hard to say, if the program stops before the timer had a chance to trigger. And, you do not flush your output, use std::endl, if you want to flush the output after a newline. Third, if your thread is going to run the io_service.run() function, it might be that the thread finds an empty io queue and run() will return immediately. To prevent that, there is a work class, that will prevent this. Here is my example, from you code, that might work as expected:
#include <boost/asio.hpp>
#include <boost/thread.hpp>
#include <iostream>
class TestTimer
{
public:
TestTimer()
: service()
, work( service )
, thread( boost::bind( &TestTimer::classifierBehavior,this ) )
, timer( service,boost::posix_time::milliseconds( 1000 ) )
{
timer.async_wait( boost::bind( &TestTimer::timerBehavior, this ) );
}
~TestTimer()
{
thread.join();
}
private:
void classifierBehavior()
{
service.run();
}
void timerBehavior() {
std::cout << "timerBehavior" << std::endl;
timer.expires_at( timer.expires_at() + boost::posix_time::milliseconds( 1000 ) );
timer.async_wait( boost::bind( &TestTimer::timerBehavior,this ) );
}
boost::asio::io_service service;
boost::asio::io_service::work work;
boost::thread thread;
boost::asio::deadline_timer timer;
};
int main()
{
TestTimer test;
}