CODEWITHSUNDEEP
c++boost
Mike Minaev
Mike Minaev

Reputation: 2062

Boost timer expires immediately

I run boost deadline_timer and do async_wait, but timer cancelled immediately. What i am doing wrong? I run ioService in my main file.

Thank you for any possible help

class A(boost::asio:io_service& ioService):
m_timer(ioService) 
{ 
    m_timer.expires_at(boost::posix_time::pos_infin);
    m_timer.async_wait([this](const boost::system::error_code& ec)
     {
       std::cout << "Timer callback " << ec.message() << std::endl; 
     });

Upvotes: 1

Views: 879

Answers (1)

sehe
sehe

Reputation: 393769

Check the lifetime of your A object.

E.g. if you do this:

#include <boost/asio.hpp>
#include <iostream>

struct A {
    A(boost::asio::io_service& ioService) : m_timer(ioService)
    {
        m_timer.expires_at(boost::posix_time::pos_infin);
        m_timer.async_wait(
            [this](const boost::system::error_code& ec) { std::cout << "Timer callback " << ec.message() << std::endl; }
        );
    }
    boost::asio::deadline_timer m_timer;
};

int main()
{
    boost::asio::io_service svc;
    {
        A a(svc);
    }
    svc.run();
}

The timer will have been canceled even before run() is invoked.

The following will do what you expected

int main()
{
    boost::asio::io_service svc;
    {
        A a(svc);
        svc.run();
    } // A destructed after `run()` completes
}

Upvotes: 2

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