#include <stdio.h>
#include <stdlib.h>
#include <windows.h>

long a = 0;
volatile long b = 0;
unsigned long c = 0;

void watek1()
{
	while (1)
	{
		a++;
		a--;
		b++;
		b--;
		InterlockedIncrement(&c);
		InterlockedDecrement(&c);
	}
}
DWORD WINAPI watek2(void *v)
{
	while (1)
	{
		a++;
		a--;
		b++;
		b--;
		InterlockedIncrement(&c);
		InterlockedDecrement(&c);
	}
}
DWORD WINAPI watek3(void *v)
{
	while (1)
	{
		a += 10;
		a += 10;
		b += 10;
		b += 10;
		InterlockedExchangeAdd(&c, 10);
		InterlockedExchangeAdd(&c, 10);
		InterlockedExchangeSubtract(&c, 20);
	}
}
int main(int argc, char *argv[])
{
	HANDLE watek_a, watek_b, watek_c;

	watek_a = CreateThread(NULL, 0, (LPTHREAD_START_ROUTINE)watek1, 0, 0, 0);
	watek_b = CreateThread(NULL, 0, watek2, 0, 0, 0);
	watek_c = CreateThread(NULL, 0, watek3, 0, 0, 0);

	for (int i = 1; i<1000; i++)
	{
		Sleep(700);
		printf("a = %d \t b = %d \t c = %d \n", a, b, c);
	}
	CloseHandle(watek_a);
	CloseHandle(watek_b);
	CloseHandle(watek_c);
	return 0;
}