Re: [Boost-users] Multithread event handling

Subject: Re: [Boost-users] Multithread event handling
From: Rutger ter Borg (rutger_at_[hidden])
Date: 2010-03-20 03:57:35

Matthias Vallentin wrote:

> On Fri, Jan 22, 2010 at 09:00:42PM -0600, Alessandro Bellina wrote:
>> Can somebody share their experiences on libraries or patterns used to
>> implement an event handling mechanism?
> 
> Below is code for an experimental scheduler that I am currently writing,
> based on boost::asio::io_service object with a bunch of threads. I am
> also using the new boost::packaged_task and boost::shared_future classes
> that arrived with 1.41. There are a few
> issues, though:
> 
>     1) I don't know why the mutex in the handler (func) does not work.
>     2) No structure (e.g., tree-like) on the tasks as in TBB, no
>     priorities.

I've written something quite simple that is also able to do 2), semantics 
are Asio-like,

reference_counter m_counter;
ios.post( m_counter.wrap( task1 ) );
ios.post( m_counter.wrap( task2 ) );
ios.post( m_counter.wrap( task3 ) );
m_counter.async_wait( all_complete_handler );

the reasons for me to use this are that it doesn't require additional 
locking (it's using an atomic counter), and that it fits the asynchronous 
model well. If there's enough interest, I can post the implementation.

Cheers,

Rutger