Hello. I have a client application that accesses a server, both coded with Boost.Asio. The code in the client is like this: Client::Client() : socket_(service_), work_(service_) { } void Client::connectWith(const std::string & hostname, int puerto, const std::string & nombre, int equipo) { using namespace boost::asio::ip; tcp::resolver resolver(service_); tcp::resolver::query query(tcp::v4(), hostname, std::to_string(puerto)); tcp::resolver::iterator endpoint_iterator = resolver.resolve(query), endpoint_end; tcp::endpoint endpoint = *endpoint_iterator; socket_.async_connect(endpoint, boost::bind(&Cliente::handleConnect, this, boost::asio::placeholders::error, ++endpoint_iterator)); std::thread([&] {service_.run(); }); } void Client::handleConnect(const boost::system::error_code & e, boost::asio::ip::tcp::resolver::iterator endpoint_iterator) { if (!e) { } else if (endpoint_iterator != boost::asio::ip::tcp::resolver::iterator()) { socket_.close(); boost::asio::ip::tcp::endpoint endpoint = *endpoint_iterator; socket_.async_connect(endpoint, boost::bind(&Cliente::handleConnect, this, boost::asio::placeholders::error, ++endpoint_iterator)); } else { std::cerr << e.message() << std::endl; } } My application crashes when calling Client::connectWith when I run the io_service::run() function in another thread, which is what I exactly want to do. If I run io_service::run() in the same thread, everything is ok. Anyone knows why? This is a GUI application, maybe it's a problem with gtkmm interaction and threads? Anyway, I would like how to handle to run io_service's run() in another thread. Thanks in advance.