#include "stdafx.h"
#include "windows.h"

int a = 100;
int b = 200;

HANDLE S = NULL;

DWORD WINAPI prevod (void * param)
{
    while (true)
    {
        WaitForSingleObject (S, INFINITE);
        if (a > 20)
        {
            a -= 20;
            b += 20;
        }else{
            a += 20;
            b -= 20;
        }
        ReleaseSemaphore (S, 1, NULL);
    }
    return 0;
}

DWORD WINAPI kontrola (void * param)
{
    while (true)
    {
        WaitForSingleObject (S, INFINITE);
        int s = a + b;
        ReleaseSemaphore (S, 1, NULL);
        if (s != 300) 
            printf ("Soucet je %d \n", s);

        // if (a+b != 300) 
        //    printf ("Soucet je %d \n", a+b);
    }
}

int _tmain(int argc, _TCHAR* argv[])
{
    S = CreateSemaphore
        (NULL, // lpSemaphoreAttributes
        1, // lInitialCount
        1, // lMaximumCount
        NULL); // name

    CreateThread 
        (NULL, // lpThreadAttributes
        0, // dwStackSize,
        prevod, 
        NULL, // parameter
        0, // flags
        NULL); // thread id

    CreateThread 
        (NULL, // lpThreadAttributes
        0, // dwStackSize,
        kontrola, 
        NULL, // parameter
        0, // flags
        NULL); // thread id

    char c;
    printf ("Stiskni enter \n");
    scanf ("%c", &c);

    return 0;
}