diff --git a/doc/examples.qbk b/doc/examples.qbk
index 0c7b1b8..6701ee5 100644
--- a/doc/examples.qbk
+++ b/doc/examples.qbk
@@ -364,6 +364,9 @@ and asynchronous operations.
 * [@boost_asio/example/cpp11/echo/blocking_tcp_echo_server.cpp]
 * [@boost_asio/example/cpp11/echo/blocking_udp_echo_client.cpp]
 * [@boost_asio/example/cpp11/echo/blocking_udp_echo_server.cpp]
+* [@boost_asio/example/cpp11/echo/byte_buffer.hpp]
+* [@boost_asio/example/cpp11/echo/echo_client.cpp]
+* [@boost_asio/example/cpp11/echo/echo_server.cpp]
 
 
 [heading Futures]
diff --git a/example/cpp11/echo/Jamfile b/example/cpp11/echo/Jamfile
index 278bd38..644a378 100644
--- a/example/cpp11/echo/Jamfile
+++ b/example/cpp11/echo/Jamfile
@@ -61,3 +61,13 @@ exe blocking_udp_echo_server
   : <template>asio_echo_example
     blocking_udp_echo_server.cpp
   ;
+
+exe echo_client
+  : <template>asio_echo_example
+    echo_client.cpp
+  ;
+
+exe echo_server
+  : <template>asio_echo_example
+    echo_server.cpp
+  ;
diff --git a/example/cpp11/echo/Jamfile.v2 b/example/cpp11/echo/Jamfile.v2
index 44cd7d4..84d61bb 100644
--- a/example/cpp11/echo/Jamfile.v2
+++ b/example/cpp11/echo/Jamfile.v2
@@ -49,3 +49,5 @@ exe blocking_tcp_echo_client : blocking_tcp_echo_client.cpp ;
 exe blocking_tcp_echo_server : blocking_tcp_echo_server.cpp ;
 exe blocking_udp_echo_client : blocking_udp_echo_client.cpp ;
 exe blocking_udp_echo_server : blocking_udp_echo_server.cpp ;
+exe echo_client : echo_client.cpp ;
+exe echo_server : echo_server.cpp ;
diff --git a/example/cpp11/echo/byte_buffer.hpp b/example/cpp11/echo/byte_buffer.hpp
new file mode 100644
index 0000000..457e384
--- /dev/null
+++ b/example/cpp11/echo/byte_buffer.hpp
@@ -0,0 +1,31 @@
+///
+/// Copyright (C) 2016 Xiaoshuang LU (luxiaoshuang at qiyi dot com)
+///
+/// Distributed under the Boost Software License, Version 1.0. (See accompanying
+/// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+///
+
+# ifndef _BYTE_BUFFER_HPP_
+# define _BYTE_BUFFER_HPP_ 1
+
+# include <cstdint>
+
+///
+/// Header Size
+///     Only 1, 2, 4, and 8 are allowed.
+///
+///  Body Size
+///     Arbitrary.
+///
+class byte_buffer
+{
+    public:
+        uintmax_t header_length_;
+
+        uintmax_t body_length_;
+
+        // where header and body reside
+        uint8_t * data_;
+};
+
+# endif
diff --git a/example/cpp11/echo/echo_client.cpp b/example/cpp11/echo/echo_client.cpp
new file mode 100644
index 0000000..eaa6392
--- /dev/null
+++ b/example/cpp11/echo/echo_client.cpp
@@ -0,0 +1,356 @@
+///
+/// Copyright (C) 2016 Xiaoshuang LU (luxiaoshuang at qiyi dot com)
+///
+/// Distributed under the Boost Software License, Version 1.0. (See accompanying
+/// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+///
+
+# include <cstdlib>
+# include <cstring>
+
+# include <atomic>
+# include <chrono>
+# include <iostream>
+# include <string>
+# include <thread>
+
+# include <boost/asio.hpp>
+# include <boost/lockfree/queue.hpp>
+
+# include "byte_buffer.hpp"
+
+class echo_client
+{
+    public:
+        echo_client(boost::asio::io_service & io_service, boost::asio::ip::tcp::resolver::iterator endpoint_iterator)
+        :
+        io_service_(io_service),
+        socket_(io_service),
+        write_queue_(1024),
+        handle_write_flag_(false)
+        {
+            this->do_connect(endpoint_iterator);
+        }
+
+        void close()
+        {
+            io_service_.post
+            (
+                [this]()
+                {
+                    socket_.close();
+                }
+            );
+        }
+
+        void read()
+        {
+            byte_buffer * byte_buffer_pointer = new byte_buffer;
+
+            byte_buffer_pointer->header_length_ = 4;
+            byte_buffer_pointer->body_length_ = 0;
+            byte_buffer_pointer->data_ = nullptr;
+
+            boost::asio::async_read
+            (
+                this->socket_,
+                boost::asio::buffer(& (byte_buffer_pointer->body_length_), byte_buffer_pointer->header_length_),
+                [this, byte_buffer_pointer](boost::system::error_code const & error_code, std::size_t length)
+                {
+# if defined(DEBUG_MODE)
+                    std::cout << "async_read header complete." << std::endl;
+# endif
+                    if (! error_code)
+                    {
+                        if (byte_buffer_pointer->header_length_ != length)
+                        {
+                            delete byte_buffer_pointer;
+
+                            std::cerr << "async_read header failed. Number of bytes read successfully does not equal expectation." << std::endl;
+
+                            boost::system::error_code temporary;
+
+                            this->socket_.close(temporary);
+                        }
+                        else
+                        {
+                            this->handle_header_read(byte_buffer_pointer);
+                        }
+                    }
+                    else
+                    {
+                        delete byte_buffer_pointer;
+
+                        std::cerr << "async_read header failed. (error_code = " << error_code.value() << ", error_message = " << error_code.message() << ", error_category = " << error_code.category().name() << ")" << std::endl;
+
+                        boost::system::error_code temporary;
+
+                        this->socket_.close(temporary);
+                    }
+                }
+            );
+        }
+
+        void write(byte_buffer * byte_buffer_pointer)
+        {
+            this->write_queue_.push(byte_buffer_pointer);
+
+            this->handle_write();
+        }
+
+    private:
+        void do_connect(boost::asio::ip::tcp::resolver::iterator endpoint_iterator)
+        {
+            boost::asio::async_connect
+            (
+                this->socket_,
+                endpoint_iterator,
+                [this](boost::system::error_code const & error_code, boost::asio::ip::tcp::resolver::iterator)
+                {
+# if defined(DEBUG_MODE)
+                    std::cout << "async_connect complete." << std::endl;
+# endif
+                    if (! error_code)
+                    {
+                        this->read();
+                    }
+                    else
+                    {
+                        std::cerr << "async_connect failed. (error_code = " << error_code.value() << ", error_message = " << error_code.message() << ", error_category = " << error_code.category().name() << ")" << std::endl;
+                    }
+                }
+            );
+        }
+
+        void handle_header_read(byte_buffer * byte_buffer_pointer)
+        {
+            byte_buffer_pointer->data_ = (uint8_t *)malloc(byte_buffer_pointer->header_length_ + byte_buffer_pointer->body_length_);
+# if defined(DEBUG_MODE)
+            std::cout << "(header_length = " << byte_buffer_pointer->header_length_ << ", body_length = " << byte_buffer_pointer->body_length_ << ", data = " << (uintmax_t)(byte_buffer_pointer->data_) << ")" << std::endl;
+# endif
+            memcpy(byte_buffer_pointer->data_, & (byte_buffer_pointer->body_length_), byte_buffer_pointer->header_length_);
+
+            boost::asio::async_read
+            (
+                this->socket_,
+                boost::asio::buffer(byte_buffer_pointer->data_ + byte_buffer_pointer->header_length_, byte_buffer_pointer->body_length_),
+                [this, byte_buffer_pointer](boost::system::error_code const & error_code, std::size_t length)
+                {
+# if defined(DEBUG_MODE)
+                    std::cout << "async_read body complete." << std::endl;
+# endif
+                    if (! error_code)
+                    {
+                        if (byte_buffer_pointer->body_length_ != length)
+                        {
+                            free(byte_buffer_pointer->data_);
+                            delete byte_buffer_pointer;
+
+                            std::cerr << "async_read body failed. Number of bytes read successfully does not equal expectation." << std::endl;
+
+                            boost::system::error_code temporary;
+
+                            this->socket_.close(temporary);
+                        }
+                        else
+                        {
+                            this->handle_body_read(byte_buffer_pointer);
+                        }
+                    }
+                    else
+                    {
+                        free(byte_buffer_pointer->data_);
+                        delete byte_buffer_pointer;
+
+                        std::cerr << "async_read body failed. (error_code = " << error_code.value() << ", error_message = " << error_code.message() << ", error_category = " << error_code.category().name() << ")" << std::endl;
+
+                        boost::system::error_code temporary;
+
+                        this->socket_.close(temporary);
+                    }
+                }
+            );
+        }
+
+        void handle_body_read(byte_buffer * byte_buffer_pointer)
+        {
+            std::string string((char *)(byte_buffer_pointer->data_ + byte_buffer_pointer->header_length_), byte_buffer_pointer->body_length_);
+
+            std::cout << "server: " << string << std::endl;
+
+            free(byte_buffer_pointer->data_);
+            delete byte_buffer_pointer;
+
+            this->read();
+        }
+
+        void handle_write()
+        {
+            if (! this->write_queue_.empty())
+            {
+                bool expected = false;
+                bool desired = true;
+
+                if (!this->handle_write_flag_.compare_exchange_weak(expected, desired))
+                {
+                    return;
+                }
+
+                byte_buffer * byte_buffer_pointer;
+
+                if (this->write_queue_.pop(byte_buffer_pointer))
+                {
+                    boost::asio::async_write
+                    (
+                        this->socket_,
+                        boost::asio::buffer(byte_buffer_pointer->data_, byte_buffer_pointer->header_length_ + byte_buffer_pointer->body_length_),
+                        [this, byte_buffer_pointer](boost::system::error_code const & error_code, std::size_t length)
+                        {
+# if defined(DEBUG_MODE)
+                            std::cout << "async_write complete." << std::endl;
+# endif
+                            this->handle_write_flag_.store(false);
+
+                            if (! error_code)
+                            {
+                                if (byte_buffer_pointer->header_length_ + byte_buffer_pointer->body_length_ != length)
+                                {
+                                    std::cerr << "async_write failed. Number of bytes written successfully does not equal expectation." << std::endl;
+
+                                    boost::system::error_code temporary;
+
+                                    this->socket_.close(temporary);
+                                }
+                                else
+                                {
+                                    this->handle_write();
+                                }
+                            }
+                            else
+                            {
+                                std::cerr << "async_write failed. (error_code = " << error_code.value() << ", error_message = " << error_code.message() << ", error_category = " << error_code.category().name() << ")" << std::endl;
+
+                                boost::system::error_code temporary;
+
+                                this->socket_.close(temporary);
+                            }
+
+                            free(byte_buffer_pointer->data_);
+                            delete byte_buffer_pointer;
+                        }
+                    );
+                }
+                else
+                {
+                    std::cerr << "It is impossible to reach here." << std::endl;;
+
+                    this->handle_write_flag_.store(false);
+                }
+            }
+        }
+
+        boost::asio::io_service & io_service_;
+        boost::asio::ip::tcp::socket socket_;
+        // high performance concurrent queue is required
+        boost::lockfree::queue<byte_buffer *> write_queue_;
+        std::atomic<bool> handle_write_flag_;
+};
+
+int main(int argc, char ** argv)
+{
+    if (argc != 3)
+    {
+        std::cerr << "SYNOPSIS: echo_client <address> <port>" << std::endl;
+        return -1;
+    }
+
+    try
+    {
+        boost::asio::io_service io_service;
+
+        boost::asio::io_service::work work(io_service);
+
+        boost::asio::ip::tcp::resolver resolver(io_service);
+
+        boost::asio::ip::tcp::resolver::iterator endpoint_iterator = resolver.resolve({ argv[1], argv[2] });
+
+        echo_client client(io_service, endpoint_iterator);
+
+        std::atomic<uintmax_t> call_id_generator(0);
+
+        int io_service_thread_number = 8;
+
+        std::vector<std::thread *> io_service_thread_vector;
+
+        int business_logic_thread_vector_number = 8;
+
+        std::vector<std::thread *> business_logic_thread_vector;
+
+        for (int i = 0; i < io_service_thread_number; ++ i)
+        {
+            std::thread * thread =
+            new std::thread
+            (
+                [& io_service]
+                {
+                    io_service.run();
+                }
+            );
+
+            io_service_thread_vector.push_back(thread);
+        }
+
+        for (int i = 0; i < business_logic_thread_vector_number; ++ i)
+        {
+            std::thread * thread =
+            new std::thread
+            (
+                [& client, & call_id_generator]
+                {
+                    while (true)
+                    {
+                        std::string string = "who's your daddy? " + std::to_string(call_id_generator.fetch_add(1));
+
+                        byte_buffer * byte_buffer_pointer = new byte_buffer;
+
+                        byte_buffer_pointer->header_length_ = 4;
+                        byte_buffer_pointer->body_length_ = string.length();
+                        byte_buffer_pointer->data_ = (uint8_t *)malloc(byte_buffer_pointer->header_length_ + byte_buffer_pointer->body_length_);
+
+                        memcpy(byte_buffer_pointer->data_, &(byte_buffer_pointer->body_length_), byte_buffer_pointer->header_length_);
+                        memcpy(byte_buffer_pointer->data_ + byte_buffer_pointer->header_length_, string.c_str(), string.length());
+
+                        client.write(byte_buffer_pointer);
+
+                        std::this_thread::sleep_for(std::chrono::milliseconds(1));
+                    }
+                }
+            );
+
+            business_logic_thread_vector.push_back(thread);
+        }
+
+        while (true)
+        {
+            std::this_thread::sleep_for(std::chrono::hours(INTMAX_MAX));
+        }
+
+        for (int i = 0; i < business_logic_thread_vector_number; ++ i)
+        {
+            business_logic_thread_vector[i]->join();
+        }
+
+        client.close();
+
+        for (int i = 0; i < io_service_thread_number; ++ i)
+        {
+            io_service_thread_vector[i]->join();
+        }
+    }
+    catch (std::exception & exception)
+    {
+        std::cerr << "Exception: " << exception.what() << std::endl;
+    }
+
+    return 0;
+}
diff --git a/example/cpp11/echo/echo_server.cpp b/example/cpp11/echo/echo_server.cpp
new file mode 100644
index 0000000..0ba32d8
--- /dev/null
+++ b/example/cpp11/echo/echo_server.cpp
@@ -0,0 +1,327 @@
+///
+/// Copyright (C) 2016 Xiaoshuang LU (luxiaoshuang at qiyi dot com)
+///
+/// Distributed under the Boost Software License, Version 1.0. (See accompanying
+/// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+///
+
+# include <cstdlib>
+# include <cstring>
+
+# include <chrono>
+# include <iostream>
+# include <memory>
+# include <string>
+# include <thread>
+
+# include <boost/asio.hpp>
+# include <boost/lockfree/queue.hpp>
+
+# include "byte_buffer.hpp"
+
+class server_socket
+:
+public std::enable_shared_from_this<server_socket>
+{
+    public:
+        server_socket(boost::asio::io_service & io_service)
+        :
+        socket_(io_service),
+        write_queue_(1024),
+        handle_write_flag_(false)
+        {
+        }
+
+        boost::asio::ip::tcp::socket & get_socket()
+        {
+            return this->socket_;
+        }
+
+        void read()
+        {
+            byte_buffer * byte_buffer_pointer = new byte_buffer;
+
+            byte_buffer_pointer->header_length_ = 4;
+            byte_buffer_pointer->body_length_ = 0;
+            byte_buffer_pointer->data_ = nullptr;
+
+            std::shared_ptr<server_socket> self(shared_from_this());
+
+            boost::asio::async_read
+            (
+                this->socket_,
+                boost::asio::buffer(& (byte_buffer_pointer->body_length_), byte_buffer_pointer->header_length_),
+                [this, self, byte_buffer_pointer](boost::system::error_code const & error_code, std::size_t length)
+                {
+# if defined(DEBUG_MODE)
+                    std::cout << "async_read header complete." << std::endl;
+# endif
+                    if (! error_code)
+                    {
+                        if (byte_buffer_pointer->header_length_ != length)
+                        {
+                            delete byte_buffer_pointer;
+
+                            std::cerr << "async_read header failed. Number of bytes read successfully does not equal expectation." << std::endl;
+
+                            boost::system::error_code temporary;
+
+                            this->socket_.close(temporary);
+                        }
+                        else
+                        {
+                            this->handle_header_read(byte_buffer_pointer);
+                        }
+                    }
+                    else
+                    {
+                        delete byte_buffer_pointer;
+
+                        std::cerr << "async_read header failed. (error_code = " << error_code.value() << ", error_message = " << error_code.message() << ", error_category = " << error_code.category().name() << ")" << std::endl;
+
+                        boost::system::error_code temporary;
+
+                        this->socket_.close(temporary);
+                    }
+                }
+            );
+        }
+
+        void write(byte_buffer * byte_buffer_pointer)
+        {
+            this->write_queue_.push(byte_buffer_pointer);
+
+            this->handle_write();
+        }
+
+    private:
+        void handle_header_read(byte_buffer * byte_buffer_pointer)
+        {
+            byte_buffer_pointer->data_ = (uint8_t *)malloc(byte_buffer_pointer->header_length_ + byte_buffer_pointer->body_length_);
+# if defined(DEBUG_MODE)
+            std::cout << "(header_length = " << byte_buffer_pointer->header_length_ << ", body_length = " << byte_buffer_pointer->body_length_ << ", data = " << (uintmax_t)(byte_buffer_pointer->data_) << ")" << std::endl;
+# endif
+            memcpy(byte_buffer_pointer->data_, & (byte_buffer_pointer->body_length_), byte_buffer_pointer->header_length_);
+
+            std::shared_ptr<server_socket> self(shared_from_this());
+
+            boost::asio::async_read
+            (
+                this->socket_,
+                boost::asio::buffer(byte_buffer_pointer->data_ + byte_buffer_pointer->header_length_, byte_buffer_pointer->body_length_),
+                [this, self, byte_buffer_pointer](boost::system::error_code const & error_code, std::size_t length)
+                {
+# if defined(DEBUG_MODE)
+                    std::cout << "async_read body complete." << std::endl;
+# endif
+                    if (! error_code)
+                    {
+                        if (byte_buffer_pointer->body_length_ != length)
+                        {
+                            free(byte_buffer_pointer->data_);
+                            delete byte_buffer_pointer;
+
+                            std::cerr << "async_read body failed. Number of bytes read successfully does not equal expectation." << std::endl;
+
+                            boost::system::error_code temporary;
+
+                            this->socket_.close(temporary);
+                        }
+                        else
+                        {
+                            this->handle_body_read(byte_buffer_pointer);
+                        }
+                    }
+                    else
+                    {
+                        free(byte_buffer_pointer->data_);
+                        delete byte_buffer_pointer;
+
+                        std::cerr << "async_read body failed. (error_code = " << error_code.value() << ", error_message = " << error_code.message() << ", error_category = " << error_code.category().name() << ")" << std::endl;
+
+                        boost::system::error_code temporary;
+
+                        this->socket_.close(temporary);
+                    }
+                }
+            );
+        }
+
+        void handle_body_read(byte_buffer * byte_buffer_pointer)
+        {
+            std::string string((char *)(byte_buffer_pointer->data_ + byte_buffer_pointer->header_length_), byte_buffer_pointer->body_length_);
+
+            std::cout << "client: " << string << std::endl;
+
+            this->write(byte_buffer_pointer);
+
+            this->read();
+        }
+
+        void handle_write()
+        {
+            if (! this->write_queue_.empty())
+            {
+                bool expected = false;
+                bool desired = true;
+
+                if (!this->handle_write_flag_.compare_exchange_weak(expected, desired))
+                {
+                    return;
+                }
+
+                byte_buffer * byte_buffer_pointer;
+
+                if (this->write_queue_.pop(byte_buffer_pointer))
+                {
+                    std::shared_ptr<server_socket> self(shared_from_this());
+
+                    boost::asio::async_write
+                    (
+                        this->socket_,
+                        boost::asio::buffer(byte_buffer_pointer->data_, byte_buffer_pointer->header_length_ + byte_buffer_pointer->body_length_),
+                        [this, self, byte_buffer_pointer](boost::system::error_code const & error_code, std::size_t length)
+                        {
+# if defined(DEBUG_MODE)
+                            std::cout << "async_write complete." << std::endl;
+# endif
+                            this->handle_write_flag_.store(false);
+
+                            if (! error_code)
+                            {
+                                if (byte_buffer_pointer->header_length_ + byte_buffer_pointer->body_length_ != length)
+                                {
+                                    std::cerr << "async_write failed. Number of bytes written successfully does not equal expectation." << std::endl;
+
+                                    boost::system::error_code temporary;
+
+                                    this->socket_.close(temporary);
+                                }
+                                else
+                                {
+                                    this->handle_write();
+                                }
+                            }
+                            else
+                            {
+                                std::cerr << "async_write failed. (error_code = " << error_code.value() << ", error_message = " << error_code.message() << ", error_category = " << error_code.category().name() << ")" << std::endl;
+
+                                boost::system::error_code temporary;
+
+                                this->socket_.close(temporary);
+                            }
+
+                            free(byte_buffer_pointer->data_);
+                            delete byte_buffer_pointer;
+                        }
+                    );
+                }
+                else
+                {
+                    std::cerr << "It is impossible to reach here." << std::endl;;
+
+                    this->handle_write_flag_.store(false);
+                }
+            }
+        }
+
+        boost::asio::ip::tcp::socket socket_;
+        // high performance concurrent queue is required
+        boost::lockfree::queue<byte_buffer *> write_queue_;
+        std::atomic<bool> handle_write_flag_;
+};
+
+class echo_server
+{
+    public:
+        echo_server(boost::asio::io_service & io_service, short port)
+        :
+        io_service_(io_service),
+        acceptor_(io_service, boost::asio::ip::tcp::endpoint(boost::asio::ip::tcp::v4(), port))
+        {
+            this->do_accept();
+        }
+
+    private:
+        void do_accept()
+        {
+            std::shared_ptr<server_socket> serverSocket{ new server_socket(this->io_service_) };
+
+            this->acceptor_.async_accept
+            (
+                serverSocket->get_socket(),
+                [this, serverSocket](boost::system::error_code const & error_code)
+                {
+# if defined(DEBUG_MODE)
+                    std::cout << "async_accept complete." << std::endl;
+# endif
+                    if (! error_code)
+                    {
+                        serverSocket->read();
+
+                        this->do_accept();
+                    }
+                    else
+                    {
+                        std::cerr << "async_accept failed. (error_code = " << error_code.value() << ", error_message = " << error_code.message() << ", error_category = " << error_code.category().name() << ")" << std::endl;
+                    }
+                }
+            );
+        }
+
+        boost::asio::io_service & io_service_;
+        boost::asio::ip::tcp::acceptor acceptor_;
+};
+
+int main(int argc, char ** argv)
+{
+    if (argc != 2)
+    {
+        std::cerr << "SYNOPSIS: echo_server <port>" << std::endl;
+
+        return -1;
+    }
+
+    try
+    {
+        boost::asio::io_service io_service;
+
+        boost::asio::io_service::work work(io_service);
+
+        echo_server server(io_service, std::atoi(argv[1]));
+
+        int io_service_thread_number = 8;
+
+        std::vector<std::thread *> io_service_thread_vector;
+
+        for (int i = 0; i < io_service_thread_number; ++ i)
+        {
+            std::thread * thread =
+            new std::thread
+            (
+                [& io_service]
+                {
+                    io_service.run();
+                }
+            );
+
+            io_service_thread_vector.push_back(thread);
+        }
+
+        while (true)
+        {
+            std::this_thread::sleep_for(std::chrono::hours(INTMAX_MAX));
+        }
+
+        for (int i = 0; i < io_service_thread_number; ++ i)
+        {
+            io_service_thread_vector[i]->join();
+        }
+    }
+    catch (std::exception & exception)
+    {
+        std::cerr << "Exception: " << exception.what() << std::endl;
+    }
+
+    return 0;
+}