Re: [boost] [ASIO] Issue with epoll reactor? Callback handler not executed.

Subject: Re: [boost] [ASIO] Issue with epoll reactor? Callback handler not executed.
From: Brad Higgins (bhiggins_at_[hidden])
Date: 2013-05-25 09:08:14

Hi Arpan,
  Read Marat's response again.  The likely issue here is not epoll or asio, but rather with your code trying to use composed operations like async_write() and async_read_until() with io_service.run_one().

> 
>   4. Marat's code is using io_service.run - why should I not be using
>   run_one?

run_one() will run until the io_service is stopped (and return 0), or until at most 1 completion handler is called (and return 1).  As Marat notes, async_read_until() is a composed operation - it may result in multiple async_read_some() operations internally, each with their own completion handler.  Since you use run_one(), you haven't allowed async_read_until() to complete in cases in which it needs to call multiple internal handlers.

> 
> Any thoughts on debugging or setting epoll options from asio interface to
> see what is going on?

Use io_service.run().  You can check its return value to see how many handlers it called.

Thanks,
Brad