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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

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));

        std::cout << "bleh\n";;

        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.

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