// vlakna2.cpp : Defines the entry point for the console application.
//

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

int a = 100;
int b = 200;

HANDLE sem = NULL;

DWORD WINAPI prevod (void * param)
{
	while (true)
	{
		WaitForSingleObject (sem, INFINITE);
		if (a > 20)
		{
		   a -= 20;
		   b += 20;
		}
		else
		{
		   b -= 10;
		   a += 10;
		}
		ReleaseSemaphore (sem, 1, NULL);
	}
	return 0;
}

DWORD WINAPI soucet (void * param)
{
	while (true)
	{
       WaitForSingleObject (sem, INFINITE);
   	   int s = a + b;
       ReleaseSemaphore (sem, 1, NULL);
	   if (s != 300)
		   printf ("Soucet je spatny %d \n", s);
	}
	return 0;
}

int _tmain(int argc, _TCHAR* argv[])
{
	sem = CreateSemaphore
		  (NULL, // security attributes
		   1, // InitialCount 
		   1, // MaximumCount
		   NULL); // name

	if (sem == NULL) return 1;

	for (int i = 1; i <= 3; i++)
	CreateThread
		(NULL, // security attributes
		 0, // stack size
		 prevod, 
		 NULL, // parameter
		 0, // flags
		 NULL );

	CreateThread
		(NULL, // security attributes
		 0, // stack size
		 soucet, 
		 NULL, // parameter
		 0, // flags
		 NULL );

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

	return 0;
}