Мьютекс и синхронизация

#include <iostream>
#include <conio.h>
#include <Windows.h>
#include <fstream>
 
int mass[20];
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();
        std::cout << "\n\nYour massiv: ";
        for (int j = 1; j <= i; ++j) {
            std::cout << mass[j] << " ";
        }
    }
    return 0;
}
 
DWORD WINAPI SecondThread(LPVOID param)
{
    if (OpenMutex(MUTEX_ALL_ACCESS, TRUE, L"ObjectMutex") == hmutex) {
    ++i;
    mass[i] = i;
    file << mass[i] << " ";
    std::cout << "Second thread works\n";
    ReleaseMutex(hmutex);
    }
    return 0;
}
 
DWORD WINAPI FirstThread(LPVOID param)
{
    while (i < 20) {
        if (OpenMutex(MUTEX_ALL_ACCESS, TRUE, L"ObjectMutex") == hmutex) {
        ++i;
        mass[i] = i;
        file << mass[i] << " ";
        std::cout << "First thread works\n";
        ReleaseMutex(hmutex);
        }
        WaitForSingleObject(hmutex, 5);
    }
    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";
    getchar();
    hmutex = CreateMutex(NULL, FALSE, L"ObjectMutex");
    hfirst = CreateThread(NULL, 0, FirstThread, &first_param, 0, &id_first);
    hsecond = CreateThread(NULL, 0, SecondThread, &second_param, 0, &id_second);
    hthird = CreateThread(NULL, 0, ThirdThread, &third_param, 0, &id_third);
    getch();
    return 0;
}

DWORD WINAPI FirstThread(LPVOID param)
{
    HANDLE hOpened = NULL;
    while (i < 20) 
    {   hOpened = OpenMutex(MUTEX_ALL_ACCESS, TRUE, L"ObjectMutex");
        if (hOpened != NULL) {
            ++i;
            mass[i] = i;
            file << mass[i] << " ";
            std::cout << "First thread works\n";
            ReleaseMutex(hOpened);
            CloseHandle(hOpened);
        } else WaitForSingleObject(hmutex, INFINITE);
    }
    return 0;
}
DWORD WINAPI SecondThread(LPVOID param)
{
    HANDLE hOpened = NULL;
    while (i < 20) 
    {
        hOpened = OpenMutex(MUTEX_ALL_ACCESS, TRUE, L"ObjectMutex");
        if (hOpened != NULL) {
            ++i;
            mass[i] = i;
            file << mass[i] << " ";
            std::cout << "Second thread works\n";
            ReleaseMutex(hOpened);
            CloseHandle(hOpened);
        } else 
            WaitForSingleObject(hmutex, INFINITE);
    }
    return 0;
}