Re: [boost] Concurrent async requests

From: Christopher Kohlhoff (chris_at_[hidden])
Date: 2007-06-08 09:36:38

On Mon, 4 Jun 2007 03:12:08 +0700,
"Владислав
Чернышов"
<carter.subscribe_at_[hidden]> said:
> OK, I got it. By "async requests" I mean requests running concurrently,
> and I don't have to wait others to process available data. Am I right?

Yes.

> Does asio use POSIX AIO in Linux implementation? I mean librt functions.

No, it uses epoll and non-blocking I/O to emulate asynchronous
operations.

> How to make some other work while doing i/o operations in single threaded
> program?

Here are two different approaches you could take:

- If your program has given over control to io_service::run(), use a
chain of posts() or maybe a deadline_timer to perform the work in small
chunks. E.g.:

  void do_some_work()
  {
    // perform a small amount of work here

    // post this function again to do a bit more work.
    io_service.post(do_some_work);
  }

- If you want the main program control to be your "other work",
periodically call io_service::poll() to check for completed I/O
operations and invoke the associated handlers.

Cheers,
Chris