Re: [Boost-users] asio::async_write, how to delete data after

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 ?

 

Thanks 

Matteo 

 

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
function 

-          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 ? 

 

Thanks

Matteo 

 

 

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