Re: [boost] .[asio] : Problem while clean shut down of multi threaded server

From: Christopher Kohlhoff (chris_at_[hidden])
Date: 2007-05-22 07:18:44

On Mon, 21 May 2007 16:37:28 +0530, Gaurav.Jain_at_[hidden] said:
> Hi,
> 
> I am using boost boost 1.33.1 with asio 0.3.8rc2. I have develop a
> Multi-threaded server program using pool of io_service. In my design i
> have pool of io_service object and this pool is controlled by a pool
> manager, which is running over a seprate io_service. I want to do clean
> shutdown of the server. In the clean shut down i want to close each
> connection running over related io_service.

It's worth noting that this is not the only way to do clean shutdown.
The new HTTP server examples ("server2" and "server3") also perform a
clean shutdown. However, rather than explicitly closing the connections,
they simply rely on the fact that the io_service destructor will destroy
all handler objects associated with unfinished operations.

> What i am doing is, while
> shutting down the server, pool manager is posting a request to each
> io_service object to shut it down. Each io_service object in turn
> posting a request to all the connection it is hosting to stop
> themselves. The problem i am facing : connection stop method is not
> getting executed at all for each running connection.
> 
> Here is a code snippet of what i am doing : 
[...]
> 	scheduler.stop();

What is scheduler? Is it an io_service? If so, by explicitly stopping it
some of your completion handlers will never be called. If you want to
use this particular clean shutdown design, it is better to wait for the
io_service::run() call to finish  automatically once all the outstanding
operations have finished.

Cheers,
Chris