Boost :: Asio: problem with async_read

I am writing a simple ProxyServer that parses packets and sends them to another server instance, for example. something like that:

client → MyProxy → SQLServer →
client <- MyProxy <- SQLServer <-

It should work in an infinite loop. My problem is that the proxy seems to free packets, sometimes even freezes. When I add a lot of debugging information (which is written to the console), ProxyServer is much more stable. It seems that ProxyServer is too fast .. :-)

I am sure that I am doing something wrong, here is the code of my session class (the code is obtained from Boost :: Asio examples).

#include "session.h"

#include <iostream>
using namespace std;

session::session(boost::asio::io_service& io_service)
: socket_(io_service)
, sqlsocket_(io_service)
, io_service_(io_service)
, resolver(io_service)
{
    cout << "session::session()" << endl;
}

session::~session()
{
    cout << "session::~session()" << endl;
    cout << "closing session ..." << endl;
}

tcp::socket& session::socket()
{
    return socket_;
}

void session::start()
{
    cout << "session::start()" << endl;
    cout << "starting session ..." << endl;

    // connect to the sqlserver database
    tcp::resolver::query query("192.168.1.50", "1317");
    tcp::resolver::iterator endpoint_iterator = resolver.resolve(query);
    tcp::endpoint endpoint = *endpoint_iterator;

    sqlsocket_.async_connect(endpoint,
        boost::bind(&session::handle_sqlserver_connect, this,
        boost::asio::placeholders::error, ++endpoint_iterator));

    // TODO: connect to the connector
}

void session::handle_read(const boost::system::error_code& error,
                          size_t bytes_transferred)
{
    cout << "session::handle_read()" << endl;
    if (!error)
    {
        cout << "session::handle_read() (read: " 
             << bytes_transferred << ")"
             << endl;
        boost::asio::async_write(sqlsocket_,
            boost::asio::buffer(data_, bytes_transferred),
            boost::bind(&session::handle_sqlserver_write, this,
            boost::asio::placeholders::error, bytes_transferred));
    }
    else
    {
        delete this;
    }
}

void session::handle_sqlserver_read(const boost::system::error_code& error,
                                    size_t bytes_transferred)
{
    cout << "session::handle_sqlserver_read()" << endl;
    if (!error)
    {
        cout << "session::handle_sqlserver_read() (read: " 
             << bytes_transferred << ")"
             << endl;
        boost::asio::async_write(socket_,
            boost::asio::buffer(data_, bytes_transferred),
            boost::bind(&session::handle_write, this,
            boost::asio::placeholders::error, bytes_transferred));
    }
    else
    {
        delete this;
    }
}

void session::handle_write(const boost::system::error_code& error,
                           size_t bytes_transferred)
{
    static int count = 0;
    cout << ++count << ". session::handle_write()" << endl;
    if (!error)
    {
        cout << "session::handle_write() (read: " 
             << bytes_transferred << ")"
             << endl;
        socket_.async_read_some(boost::asio::buffer(data_, max_length),
            boost::bind(&session::handle_read, this,
            boost::asio::placeholders::error,
            boost::asio::placeholders::bytes_transferred));
    }
    else
    {
        delete this;
    }
}

void session::handle_sqlserver_write(const boost::system::error_code& error,
                                     size_t bytes_transferred)
{
    cout << "session::handle_sqlserver_write()" << endl;
    if (!error)
    {
        cout << "session::handle_sqlserver_write() (read: " 
             << bytes_transferred << ")"
             << endl;
        sqlsocket_.async_read_some(boost::asio::buffer(data_, max_length),
            boost::bind(&session::handle_sqlserver_read, this,
            boost::asio::placeholders::error,
            boost::asio::placeholders::bytes_transferred));
    }
    else
    {
        delete this;
    }
}

void session::handle_sqlserver_connect(const boost::system::error_code& error,
                                       tcp::resolver::iterator endpoint_iterator)
{
    cout << "session::handle_sqlserver_connect()" << endl;
    if (!error)
    {
        socket_.async_read_some(boost::asio::buffer(data_, max_length),
            boost::bind(&session::handle_read, this,
            boost::asio::placeholders::error,
            boost::asio::placeholders::bytes_transferred));
    }
    else if (endpoint_iterator != tcp::resolver::iterator())
    {
        sqlsocket_.close();
        tcp::endpoint endpoint = *endpoint_iterator;
        sqlsocket_.async_connect(endpoint,
            boost::bind(&session::handle_sqlserver_connect, this,
            boost::asio::placeholders::error, ++endpoint_iterator));
    }
}

async_ * ? - , , , Winsock, .

, ?

- : accept

CreateThread(0, 0, (LPTHREAD_START_ROUTINE)listenatclient, (LPVOID)cs, 0, 0);
CreateThread(0, 0, (LPTHREAD_START_ROUTINE)listenatserver, (LPVOID)cs, 0, 0);

, :

void listenatclient(LPVOID connection)
{
    connection_s* cs = (connection_s*)connection;
    char inMessagecli[MSG_SIZE];
    int rcount = 0;

    ...

    do
    {
        memset(inMessagecli, 0, MSG_SIZE);
        rcount = recv((SOCKET)cs->client, inMessagecli, MSG_SIZE, 0);
        if (rcount != SOCKET_ERROR)
        {
            // analyze package
            ...

            send((SOCKET)cs->server, inMessagecli, rcount, 0);
        }
    } while (rcount > 0);
}

void listenatserver(LPVOID connection)
{
    connection_s* cs = (connection_s*)connection;
    char inMessageserv[MSG_SIZE];
    int rcount = 0;

    do
    {
        memset(inMessageserv, 0, MSG_SIZE);
        rcount = recv((SOCKET)cs->server, inMessageserv, MSG_SIZE, 0);
        if (rcount != SOCKET_ERROR)
        {
            send((SOCKET)cs->client, inMessageserv, rcount, 0);         
        }
    } while (rcount > 0);
}

[EDIT]: async_read sqlserver, , boost:: bind, boost.

, 2 (3 ). , , , .

boost asio treadsafe, - :-)?

ProxyServer :

session.h:

session.cpp:

server.h:

server.cpp:

ProxyServer.cpp: