Boost logo

Boost Users :

Subject: Re: [Boost-users] asio::async_write, how to delete data after
From: Matteo Lanzi (matteo.lanzi_at_[hidden])
Date: 2010-07-10 20:55:41

Just a quick look but i have a quick question,


Write method require as second param a buffer; te axample you suggested pass
shared_const_buffer which does not implements any interface.

I suppose the trick should be in these lines


  typedef boost::asio::const_buffer value_type;

  typedef const boost::asio::const_buffer* const_iterator;


but I don't know why.

 Can you explain me the trick ?





From: boost-users-bounces_at_[hidden]
[mailto:boost-users-bounces_at_[hidden]] On Behalf Of ecyrbe
Sent: sabato 10 luglio 2010 16:48
To: boost-users_at_[hidden]
Subject: Re: [Boost-users] asio::async_write, how to delete data after


see the reference_counted example in the boost asio documentation. It's a
good start to allow dynamic buffer allocation and auto deletion when your
message is delivered...

2010/7/10 Matteo Lanzi <matteo.lanzi_at_[hidden]>

Hi, I modified a little the echo server example and to build up a simple tcp
server; basically what I do is:


- Start the server in a thread

- When a session is created I start async read

- If my session receive a signal I write a data with async write

- Handle data written then start again async read ( otherwise the
connection should be closed )


I have some specific functions which prepare packets and then invoke the
write method


I would like to avoid static allocation of my buffer instead of dynamic one;
for doing that I supposed to use shared_array<T>

I can't do that because the boost::asio::buffer, required by the write
method, doesn't seem to accept smart pointer.


So my questions are:

- Is there a common pattern to follow for preparing data and delete
them after the delivery ?

- Is it possible to use smart pointers with async_write ?

- Is the async_write executed in another thread ? should I have
concurrency problems if I would use an unique output buffer and clear it on
the handle_write callback ?






Boost-users mailing list


Boost-users list run by williamkempf at, kalb at, bjorn.karlsson at, gregod at, wekempf at