It takes quite a moment for socket.read_some to return after socket.close has been called, in linux

Question

I'm using Boost.Asio as a simple socket library.

When I open a socket, I create a thread which keeps reading on that socket, and returns when the socket has been closed, or some other errors occured.

while((read = socket->read_some(buf, ec)) != 0) {
    // deal with bytes read
}

This code works well on Windows and Mac. However with linux, when the socket is closed from the main thread, it takes quite long time for socket::read_some to return - I found it's more than 2 minutes.

Is there anything I can do to improve this?

Answer 1

If you desire cancel-ability, use asynchronous sockets. Don't use synchronous methods such as read_some. This has been discussed ad infinitum on the asio-users mailing list. There's also a ticket on the boost bug tracker discussing it.

Also see my answer to a similar question.