I'm implementing timeouts according to suggestion placed here http://lists.boost.org/Archives/boost/2007/04/120339.php
because I still don't understand fully how io_service work I have question:
is this way of implementation of timeout safe when I'm using pool of threads for one io_service?
That function assumes the io_service associated with your socket is *stopped*, so it cannot run either in one thread or in multiple threads. Note that it is an async. implementation for *synchronous* use, and when you use sync. i/o you do not explicitly run io_service: io_service io; tcp::socket sock(io); // open socket, define your buffer..., then: read_with_timeout(sock, buffer); But if you've already got an async. design, you don't need workarounds to implement timeouts - just use deadline_timer in the straightforward way.