Need explanation for this boost::asio timer example

Posted by ApplePieIsGood on Stack Overflow See other posts from Stack Overflow or by ApplePieIsGood
Published on 2010-03-20T02:38:33Z Indexed on 2010/03/20 2:41 UTC
Read the original article Hit count: 1015

Filed under:

boost

|

asio

|

c++

|

boost-asio

There is a line in the 3rd tutorial on Boost asio that shows how to renew a timer and yet prevent there from being drift. The line is the following:

 t->expires_at(t->expires_at() + boost::posix_time::seconds(1));

Maybe it's me but I wasn't able to find documentation on the 2nd usage of expires_at(), with no parameters. expires_at(x) sets the new expiration, cancelling any pending completion handlers. So presumably expires_at() does what, return time of the last expiry? So by adding one second, if there should be some number of ms, say n ms, then it will in essence be "subtracted" from the next expiry since the time is being accounted for? What happens then if the time it takes to perform this handler is greater than 1 second in this example? Does it fire immediately?

© Stack Overflow or respective owner

Related posts about boost

boost fusion: strange problem depending on number of elements on a vector

as seen on Stack Overflow - Search for 'Stack Overflow'
I am trying to use Boost::Fusion (Boost v1.42.0) in a personal project. I get an interesting error with this code: #include "boost/fusion/include/sequence.hpp" #include "boost/fusion/include/make_vector.hpp" #include "boost/fusion/include/insert.hpp" #include "boost/fusion/include/invoke_procedure… >>> More
How can I use the Boost Graph Library to lay out verticies?

as seen on Stack Overflow - Search for 'Stack Overflow'
I'm trying to lay out vertices using the Boost Graph Library. However, I'm running into some compilation issues which I'm unsure about. Am I using the BGL in an improper manner? My code is: PositionVec position_vec(2); PositionMap position(position_vec.begin(), get(vertex_index, g)); int iterations… >>> More
Storing objects in the array

as seen on Stack Overflow - Search for 'Stack Overflow'
Hello, I want to save boost signals objects in the map (association: signal name ? signal object). The signals signature is different, so the second type of map should be boost::any. map<string, any> mSignalAssociation; The question is how to store objects without defining type of new signal… >>> More
Problem with boost::find_format_all, boost::regex_finder and custom regex formatter (bug boost 1.42)

as seen on Stack Overflow - Search for 'Stack Overflow'
I have a code that has been working for almost 4 years (since boost 1.33) and today I went from boost 1.36 to boost 1.42 and now I have a problem. I'm calling a custom formatter on a string to format parts of the string that match a REGEX. For instance, a string like: "abc;def:" will be changed… >>> More
build error with boost spirit grammar (boost 1.43 and g++ 4.4.1)

as seen on Stack Overflow - Search for 'Stack Overflow'
I'm having issues getting a small spirit/qi grammar to compile. The build stack trace is fugly enought to not make any sense to me (despite some assertion_failed i could notice in there but that didn't brought much information) the input grammar header: inputGrammar.h #include <boost/config/warning_disable… >>> More

Related posts about asio

Boost::Asio : io_service.run() vs poll() or how do I integrate boost::asio in mainloop

as seen on Stack Overflow - Search for 'Stack Overflow'
Hi, I am currently trying to use boost::asio for some simple tcp networking for the first time, and I allready came across something I am not really sure how to deal with. As far as I understand io_service.run() method is basically a loop which runs until there is nothing more left to do, which means… >>> More
boost::asio::async_read_until problem

as seen on Stack Overflow - Search for 'Stack Overflow'
I'm trying to modify the echo server example from boost asio and I'm running into problem when I try to use boost::asio::async_read_until. Here's the code: #include <cstdlib> #include <iostream> #include <boost/bind.hpp> #include <boost/asio.hpp> using boost::asio::ip::tcp; class… >>> More
Linker error when compiling boost.asio example

as seen on Stack Overflow - Search for 'Stack Overflow'
Hi, I'm trying to learn a little bit C++ and Boost.Asio. I'm trying to compile the following code example: #include <iostream> #include <boost/array.hpp> #include <boost/asio.hpp> using boost::asio::ip::tcp; int main(int argc, char* argv[]) { try { if (argc != 2) { … >>> More
Does boost::asio makes excessive small heap allocations or am I wrong?

as seen on Stack Overflow - Search for 'Stack Overflow'
#include <cstdlib> #include <iostream> #include <boost/bind.hpp> #include <boost/asio.hpp> using boost::asio::ip::tcp; class session { public: session(boost::asio::io_service& io_service) : socket_(io_service) { } tcp::socket& socket() … >>> More
boost::asio::async_write problem

as seen on Stack Overflow - Search for 'Stack Overflow'
Hi, I'm trying to figure out how asynchronous reads and writes work in boost asio by manipulating the echo example. Currently, I have a server that should, when sent a sentence, respond with only the first word. However, the boost::asio::async_write never seems to complete even though the write… >>> More