Re: [boost] boost asio io_service - not getting boost::asio::error::eof on disconnect in read()

From: Christopher Kohlhoff (chris_at_[hidden])
Date: 2006-11-05 20:43:08

Hi Matthew,

Matthew Herrmann <matthew.herrmann_at_[hidden]> wrote:
> I am calling tcp::socket::read on one thread, and then calling
> tcp::socket::close on another thread.

Assuming you're trying to do this on the same tcp::socket
object, don't do it at all :) It's thread-unsafe and not going
to have portable behaviour. If you need cancellation, use the
async functions (as it seems you are trying to do).

[...]

> int main()
> {
>     boost::asio::io_service io_service;
>     boost::thread(boost::bind(boost::asio::io_service::run,
> &io_service));
>     sleep(1);
>     io_service.post(boost::bind(&test_fn));
>     while(true)
>     { sleep(1); }
>     return 0;
> }

The io_service::run() call returns when it has no more work to
do. Since you have given it no work before starting the thread
that calls io_service::run(), it will exit immediately.

Starting an async operation (or using io_service::post) is one
way to give it work. Another is to construct an object of class
io_service::work. E.g.:

int main()
{
    boost::asio::io_service io_service;
    boost::asio::io_service::work work(io_service); // <---
    boost::thread(boost::bind(
          boost::asio::io_service::run, &io_service));
    sleep(1);
    io_service.post(boost::bind(&test_fn));
    while(true)
    { sleep(1); }
    return 0;
}

Cheers,
Chris