I have a simple TCP multiprocess server...inside each child server(each of one handles distincted connection), I call a list of operation...suppose the following:

socket.async_read_some(....); //receive a client request
socket.async_write_some(...); //respond to client request

socket.async_write_some(...); //independently of the client request, send something to the client

Have I use strand,or this situation doesn't cause problems?
I don't use thread...
thanks!!!

Da: Rutger ter Borg <rutger@terborg.net>
A: boost-users@lists.boost.org
Inviato: Mer 9 marzo 2011, 11:42:41
Oggetto: Re: [Boost-users] boost concurrent write/read

On 03/09/2011 11:22 AM, Marco Piacentini wrote:
> Hi guys...a simple question..
> what happen if there are concurrent write/write(for example
> async_write_some) or write/read(for example async_write_some and
> async_read_some) operation on the same socket?I have handle this problem
> or it is automatically handled by boost functions?
> And if I have to send a lot of data, to avoid congestion problem, I need
> a buffer?
>
> thank you...
>

You have to make sure that no concurrent calls can occur to member functions of the same socket class. This may be achieved by serializing your read/writes/read handlers/write handlers through a strand.

In case of large buffers, Asio may split up an async_write() operation into several async_write_some operations (often referred to as "composed operations").

HtH,
Cheers,

Rutger

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