Многопоточный сервер

boost::thread_group threads;
void listen_thread() 
{
    service.run();
}
void start_listen(int thread_count) 
{
    for ( int i = 0; i < thread_count; ++i)
        threads.create_thread( listen_thread);
}
int main(int argc, char* argv[]) 
{
    talk_to_client::ptr client = talk_to_client::new_();
    acc.async_accept(client->sock(), boost::bind(handle_accept,client,_1));
    start_listen(100);
    threads.join_all();
}

void server::run()
{
  // Create a pool of threads to run all of the io_services.
  std::vector<boost::shared_ptr<asio::thread> > threads;
  for (std::size_t i = 0; i < thread_pool_size_; ++i)
  {
    boost::shared_ptr<asio::thread> thread(new asio::thread(
          boost::bind(&asio::io_service::run, &io_service_)));
    threads.push_back(thread);
  }
 
  // Wait for all threads in the pool to exit.
  for (std::size_t i = 0; i < threads.size(); ++i)
    threads[i]->join();
}

//
// server.cpp
// ~~~~~~~~~~
//
// Copyright (c) 2003-2013 Christopher M. Kohlhoff (chris at kohlhoff dot com)
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at [url]http://www.boost.org/LICENSE_1_0.txt[/url])
//
 
#include "server.hpp"
#include <boost/bind.hpp>
#include <signal.h>
 
namespace http {
namespace server {
 
server::server(const std::string& address, const std::string& port,
    const std::string& doc_root)
  : io_service_(),
    signals_(io_service_),
    acceptor_(io_service_),
    connection_manager_(),
    new_connection_(),
    request_handler_(doc_root)
{
  // Register to handle the signals that indicate when the server should exit.
  // It is safe to register for the same signal multiple times in a program,
  // provided all registration for the specified signal is made through Asio.
  signals_.add(SIGINT);
  signals_.add(SIGTERM);
#if defined(SIGQUIT)
  signals_.add(SIGQUIT);
#endif // defined(SIGQUIT)
  signals_.async_wait(boost::bind(&server::handle_stop, this));
 
  // Open the acceptor with the option to reuse the address (i.e. SO_REUSEADDR).
  boost::asio::ip::tcp::resolver resolver(io_service_);
  boost::asio::ip::tcp::resolver::query query(address, port);
  boost::asio::ip::tcp::endpoint endpoint = *resolver.resolve(query);
  acceptor_.open(endpoint.protocol());
  acceptor_.set_option(boost::asio::ip::tcp::acceptor::reuse_address(true));
  acceptor_.bind(endpoint);
  acceptor_.listen();
 
  start_accept();
}
 
void server::run()
{
  // The io_service::run() call will block until all asynchronous operations
  // have finished. While the server is running, there is always at least one
  // asynchronous operation outstanding: the asynchronous accept call waiting
  // for new incoming connections.
  io_service_.run();
}
 
void server::start_accept()
{
  new_connection_.reset(new connection(io_service_,
        connection_manager_, request_handler_));
  acceptor_.async_accept(new_connection_->socket(),
      boost::bind(&server::handle_accept, this,
        boost::asio::placeholders::error));
}
 
void server::handle_accept(const boost::system::error_code& e)
{
  // Check whether the server was stopped by a signal before this completion
  // handler had a chance to run.
  if (!acceptor_.is_open())
  {
    return;
  }
 
  if (!e)
  {
    connection_manager_.start(new_connection_);
  }
 
  start_accept();
}
 
void server::handle_stop()
{
  // The server is stopped by cancelling all outstanding asynchronous
  // operations. Once all operations have finished the io_service::run() call
  // will exit.
  acceptor_.close();
  connection_manager_.stop_all();
}
 
} // namespace server
} // namespace http

//Here is a simple synchronous server:using boost::asio;
typedef boost::shared_ptr<ip::tcp::socket> socket_ptr;
io_service service;
ip::tcp::endpoint ep( ip::tcp::v4(), 2001)); // listen on 2001
ip::tcp::acceptor acc(service, ep);
while ( true) 
{
    socket_ptr sock(new ip::tcp::socket(service));
    acc.accept(*sock);
    boost::thread( boost::bind(client_session, sock));
}
void client_session(socket_ptr sock)
 {
    while ( true)
     {
        char data[512];
        size_t len = sock->read_some(buffer(data));
        if ( len > 0) 
        write(*sock, buffer("ok", 2));
    }
}