MUTEX

#include <iostream>
#include <conio.h>
#include <Windows.h>
#include <fstream>

int mass[10];
HANDLE hfirst, hsecond, hthird, hmutex;
int i = 0;
std::fstream file;

DWORD WINAPI ThirdThread(LPVOID param)
{
    if ((WaitForSingleObject(hfirst, INFINITE) == WAIT_OBJECT_0) && (WaitForSingleObject(hsecond, INFINITE) == WAIT_OBJECT_0)) {
        file.close();
        CloseHandle(hmutex);
        std::cout << "\n\nYour massiv: ";
        for (int j = 1; j <= i; ++j) {
            std::cout << mass[j] << " ";
        }
    }
    return 0;
}

DWORD WINAPI SecondThread(LPVOID param)
{
    while (i < 10) {
        if (OpenMutex(MUTEX_ALL_ACCESS, TRUE, L"ObjectMutex") != NULL) {
            WaitForSingleObject(hmutex, INFINITE);
            ++i;
            mass[i] = mass[i - 1]  + i + i;
            file << " " << mass[i] << " ";
            std::cout << "Second thread works\n";
            ReleaseMutex(hmutex);
        }
    }
    return 0;
}

DWORD WINAPI FirstThread(LPVOID param)
{
    while (i < 10) {
        if (OpenMutex(MUTEX_ALL_ACCESS, TRUE, L"ObjectMutex") != NULL) {
            WaitForSingleObject(hmutex, INFINITE);
            ++i;
            mass[0] = 0;
            mass[i] = mass[i - 1] + i;
            file  << mass[i];
            std::cout << "First thread works\n";
            ReleaseMutex(hmutex);
        }
    }
    return 0;
}

int main()
{
    DWORD first_param, id_first = 1, second_param, id_second = 1, third_param, id_third = 1;
    file.open("text.txt", std::fstream::out);
    std::cout << "Please, click any button to start \n";
    getch();
    hmutex = CreateMutex(NULL, FALSE, L"ObjectMutex");
    hfirst = CreateThread(NULL, 0, FirstThread, &first_param, 0, NULL);
    hsecond = CreateThread(NULL, 0, SecondThread, &second_param, 0, NULL);
    hthird = CreateThread(NULL, 0, ThirdThread, &third_param, 0, NULL);
    getch();
    return 0;
}