[Boost-users] ASIO io_service behaviour

Subject: [Boost-users] ASIO io_service behaviour
From: Philip Gaskell (philip.gaskell_at_[hidden])
Date: 2008-10-30 11:40:04

Hi all,

I have got some code to test the behavior of io_service. The relevant code is as 
follows:

void ioservice_lifotest()
{
        boost::asio::io_service io;
        boost::asio::deadline_timer t(io, boost::posix_time::seconds(6));

        boost::asio::io_service io2;
        boost::asio::deadline_timer t1(io2, boost::posix_time::seconds(1));
        boost::asio::deadline_timer t2(io2, boost::posix_time::seconds(2));
        boost::asio::deadline_timer t3(io2, boost::posix_time::seconds(3));
        boost::asio::deadline_timer t4(io2, boost::posix_time::seconds(4));

        t.async_wait(printHello);
        t1.async_wait(print1);
        t2.async_wait(print2);
        t3.async_wait(print3);
        t4.async_wait(print4);

        io.run();
        std::cout << "bleh\n";
        io2.run();

        std::cout << "done\n";
}

printHello(), print1(), print2(), print3() and print4() are simple functions 
that print different messages to the console.

I was expecting printHello to be called first, then print1, then print2, then 
print3 and print4, because that is the order the events were added to the 
io_service service. However these functions were called in reverse order. It is 
as though the underlying queue mechanism is actually a stack.

I expect I have missed some of, or misunderstood the documentation, but a few 
hints as to what is happening will be appreciated.

-- 
Regards,
Phil
E: philip.gaskell_at_[hidden] |  M: [phone] |  W: www.momote.com
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