Question

How can I listen to two socket simultaneously using boost::asio? I think there shouldn’t be two io_service. Should I resolve two queries for two acceptors to listen to two sokets? Supposed the two sockets are:

127.0.0.1:7001
127.0.0.2:7001

Answer 1

You are correct in using one asio io_service. (You are of course allowed to use as many as you would like, but it’s more efficient to just use one since it blocks in a thread and you avoid unnecessary context switching. Also, you can call io_service::run from multiple threads should you wish to use multiple processors.)

Encapsulate the acceptor and the socket in a class as is demonstrated in many asio examples, and pass the io_service to the class constructor by reference. You can then bind the acceptor to the desired address, listen and call async_accept in a class method that you call.