cn-lab2-server-mt

// cn-lab2-server.cpp: определяет точку входа для консольного приложения.
//

#include "stdafx.h"
#include <winsock2.h>
#include <iostream>
#include <sstream>
#include <thread>
#include <vector>

#pragma comment(lib, "ws2_32.lib")

using namespace std;

vector<thread > requests;

int request_process(int request_id, SOCKET sock, sockaddr_in client_addr, int client_addr_size, char request) {
    int a, b, c;
    stringstream ss;
    ss << request;
    ss >> a >> b >> c;
    string triangle_exist = "false";
    if ((a < b + c) && (b < a + c) && (c < a + b))
        triangle_exist = "true";
    sendto(sock, triangle_exist.c_str(), triangle_exist.length(), 0, (sockaddr *)&client_addr, client_addr_size);
    cout << "Answer " << request_id << " sent" << endl;
}

int port_listen(SOCKET sock) {
    for (int request_id = 1;; request_id++) {
        sockaddr_in client_addr;
        int client_addr_size = sizeof(client_addr);
        char recv_buff[1024];
        int len = recvfrom(sock, &recv_buff[0], sizeof(recv_buff) - 1, 0, (sockaddr *)&client_addr, &client_addr_size);
        if (len < 0)
            return 0;
        cout << "Request " << request_id << " received" << endl;
        recv_buff[len] = '\0';
        requests.push_back(thread(request_process, request_id, sock, client_addr, client_addr_size, recv_buff));
    }
    return 0;
}

int main()
{
    cout << "cn-lab2 var10 server start" << endl;
    WSAData wsadata;
    WSAStartup(0x0202, &wsadata);
    cout << "Winsock2 initialized" << endl;
    SOCKET sock;
    sock = socket(AF_INET, SOCK_DGRAM, 0);
    if (sock == INVALID_SOCKET) {
        cout << "Create socket error " << WSAGetLastError() << endl;
        WSACleanup();
        return 1;
    }
    cout << "Socket created successfully" << endl;
    sockaddr_in local_addr;
    local_addr.sin_family = AF_INET;
    local_addr.sin_addr.S_un.S_addr = 0;
    local_addr.sin_port = htons(5002);
    if (::bind(sock, (sockaddr *)&local_addr, sizeof(local_addr))) {
        cout << "Error bind " << WSAGetLastError() << endl;
        closesocket(sock);
        WSACleanup();
        return 2;
    }
    cout << "Bound successful" << endl;
    thread listen(port_listen, ref(sock));
    string s;
    do {
        cin >> s;
    } while (s != "stop");
    closesocket(sock);
    if (listen.joinable())
        listen.join();
    WSACleanup();
    cout << "cn-lab2 var10 server stopped" << endl;
    return 0;
}