Re: [Boost-users] Does the Proactor of boost uses edge-triggered epoll on linux?

Subject: Re: [Boost-users] Does the Proactor of boost uses edge-triggered epoll on linux?
From: Yang Acer (yangacer_at_[hidden])
Date: 2013-05-29 11:43:55

On 2013/5/29, at 23:22, "Journeyer J. Joh" <oosaprogrammer_at_[hidden]> wrote:

> Hi Igor R,
> 
> I have one answer to your question and one new question for you and other people.
> 
> >> Don't the following notes aswer your question?
> 
> 1. I am sorry but it is no because there is no statement whether the epoll is edge-triggered or level-triggered. It only said like the one shown below.
> Linux Kernel 2.6
> Demultiplexing mechanism:
> 
>  Uses epoll for demultiplexing.
> 
> 
> I downloaded latest boost 1.53.0 and searched for epoll_create, epoll_wait, and many socket APIs for linux and windows but failed to find api calls for those.
> 
> I expected that I would find api calls for those.
> 
> 2. If it - boost.asio - doesn't call these api, how boost.asio implemens it's functions?
> 
> Thank you very much.
> Sincerely
> Journeyer
> 
> ----------------------------------------
> Journeyer J. Joh
> o o s a p r o g r a m m e r
> a t
> g m a i l  d o t  c o m
> ----------------------------------------
> 
> 
> 2013/5/29 Igor R <boost.lists_at_[hidden]>
>> > I have some questions about boost's async IO implementation for linux.
>> >
>> > 1. Does it use edge-triggered epoll to implement the Proactor (in terms of
>> > Reactor)?
>> >
>> > http://www.boost.org/doc/libs/1_53_0/doc/html/boost_asio/overview/core/async.html
>> >
>> > The guide above says that boost's Proactor is implemented in terms of
>> > Reactor when it comes to Linux.
>> >
>> > If it is based on Reactor, I guess it should be level-triggered epoll.
>> > 2. Am I right?
>> >
>> > Then my question is
>> > 3. Does boost use edge-triggered epoll in any kind of async IO on linux?
>> > 4. Isn't edge-triggered epoll a good method to implement async IO on linux?
>> 
>> 
>> Don't the following notes aswer your question?
>> http://www.boost.org/doc/libs/1_53_0/doc/html/boost_asio/overview/implementation.html
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Hi,

Check out boost/asio/detail/impl/epoll_reactor.ipp

Best
Acer