使用多线程技术、同步机制、线程池和异步编程技术设计实现多客户并发访问和模拟多个用户进行压力测试 C/C++代码 客户端和服务端

以下是一个基于C++11标准的多线程、同步机制、线程池和异步编程技术实现的多客户并发访问和模拟多个用户进行压力测试的服务端和客户端代码。其中，使用了Boost库的线程池实现。

服务端代码：

#include <iostream>
#include <boost/asio.hpp>
#include <boost/thread.hpp>
#include <boost/bind.hpp>
#include <boost/enable_shared_from_this.hpp>
#include <boost/shared_ptr.hpp>
#include <boost/asio/thread_pool.hpp>

using boost::asio::ip::tcp;

class session : public boost::enable_shared_from_this<session>
{
public:
    session(boost::asio::io_service& io_service)
        : socket_(io_service)
    {
    }

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

    void start()
    {
        boost::asio::async_read(socket_, boost::asio::buffer(data_, max_length),
            boost::bind(&session::handle_read, shared_from_this(),
            boost::asio::placeholders::error,
            boost::asio::placeholders::bytes_transferred));
    }

    void handle_read(const boost::system::error_code& error,
        size_t bytes_transferred)
    {
        if (!error)
        {
            boost::asio::async_write(socket_,
                boost::asio::buffer(data_, bytes_transferred),
                boost::bind(&session::handle_write, shared_from_this(),
                boost::asio::placeholders::error));
        }
        else
        {
            std::cout << "Error: " << error.message() << std::endl;
        }
    }

    void handle_write(const boost::system::error_code& error)
    {
        if (!error)
        {
            boost::asio::async_read(socket_, boost::asio::buffer(data_, max_length),
                boost::bind(&session::handle_read, shared_from_this(),
                boost::asio::placeholders::error,
                boost::asio::placeholders::bytes_transferred));
        }
        else
        {
            std::cout << "Error: " << error.message() << std::endl;
        }
    }

private:
    tcp::socket socket_;
    enum { max_length = 1024 };
    char data_[max_length];
};

class server
{
public:
    server(boost::asio::io_service& io_service, short port)
        : io_service_(io_service),
        acceptor_(io_service, tcp::endpoint(tcp::v4(), port))
    {
        start_accept();
    }

    void start_accept()
    {
        session_ptr new_session(new session(io_service_));
        acceptor_.async_accept(new_session->socket(),
            boost::bind(&server::handle_accept, this, new_session,
            boost::asio::placeholders::error));
    }

    void handle_accept(session_ptr session,
        const boost::system::error_code& error)
    {
        if (!error)
        {
            session->start();
            start_accept();
        }
        else
        {
            std::cout << "Error: " << error.message() << std::endl;
        }
    }

private:
    boost::asio::io_service& io_service_;
    tcp::acceptor acceptor_;
};

int main(int argc, char* argv[])
{
    try
    {
        if (argc != 2)
        {
            std::cerr << "Usage: server <port>\n";
            return 1;
        }

        boost::asio::io_service io_service;

        server s(io_service, std::atoi(argv[1]));

        boost::asio::thread_pool thread_pool(4);
        boost::asio::post(thread_pool, [&io_service]() { io_service.run(); });
        boost::asio::post(thread_pool, [&io_service]() { io_service.run(); });
        boost::asio::post(thread_pool, [&io_service]() { io_service.run(); });
        boost::asio::post(thread_pool, [&io_service]() { io_service.run(); });

        thread_pool.join();
    }
    catch (std::exception& e)
    {
        std::cerr << "Exception: " << e.what() << "\n";
    }

    return 0;
}

客户端代码：

#include <iostream>
#include <boost/asio.hpp>
#include <boost/thread.hpp>
#include <boost/bind.hpp>
#include <boost/asio/thread_pool.hpp>

using boost::asio::ip::tcp;

class client
{
public:
    client(boost::asio::io_service& io_service, tcp::resolver::iterator endpoint_iterator)
        : io_service_(io_service),
        socket_(io_service)
    {
        boost::asio::async_connect(socket_, endpoint_iterator,
            boost::bind(&client::handle_connect, this,
            boost::asio::placeholders::error));
    }

    void handle_connect(const boost::system::error_code& error)
    {
        if (!error)
        {
            boost::asio::async_write(socket_, boost::asio::buffer(request_, request_length),
                boost::bind(&client::handle_write, this,
                boost::asio::placeholders::error));
        }
        else
        {
            std::cout << "Error: " << error.message() << std::endl;
        }
    }

    void handle_write(const boost::system::error_code& error)
    {
        if (!error)
        {
            boost::asio::async_read(socket_, boost::asio::buffer(reply_, reply_length),
                boost::bind(&client::handle_read, this,
                boost::asio::placeholders::error));
        }
        else
        {
            std::cout << "Error: " << error.message() << std::endl;
        }
    }

    void handle_read(const boost::system::error_code& error)
    {
        if (!error)
        {
            boost::asio::async_write(socket_, boost::asio::buffer(request_, request_length),
                boost::bind(&client::handle_write, this,
                boost::asio::placeholders::error));
        }
        else
        {
            std::cout << "Error: " << error.message() << std::endl;
        }
    }

private:
    boost::asio::io_service& io_service_;
    tcp::socket socket_;
    enum { request_length = 1024, reply_length = 8 };
    char request_[request_length];
    char reply_[reply_length];
};

int main(int argc, char* argv[])
{
    try
    {
        if (argc != 3)
        {
            std::cerr << "Usage: client <host> <port>\n";
            return 1;
        }

        boost::asio::io_service io_service;

        tcp::resolver resolver(io_service);
        auto endpoint_iterator = resolver.resolve({ argv[1], argv[2] });

        const int num_clients = 100;
        boost::asio::thread_pool thread_pool(num_clients);
        for (int i = 0; i < num_clients; ++i)
        {
            boost::asio::post(thread_pool, [&io_service, &endpoint_iterator]() { client c(io_service, endpoint_iterator); });
        }

        thread_pool.join();
    }
    catch (std::exception& e)
    {
        std::cerr << "Exception: " << e.what() << "\n";
    }

    return 0;
}

这里的服务端使用了异步I/O模型，每个客户端连接对应一个session对象，处理客户端请求时使用了异步读写操作。同时，为了提高并发处理能力，使用了Boost库的线程池实现多线程处理客户端请求。

客户端使用了异步I/O模型，每个客户端连接使用一个client对象，处理客户端请求时使用了异步读写操作。为了模拟多个用户进行压力测试，使用了Boost库的线程池实现多线程创建客户端连接。