race.cpp

#include <iostream>
#include <thread>
#include <cstdlib>
#include <cstdint>
#include <cinttypes>

static uint64_t win  = 0;
static uint64_t loss = 0;

void thread_printer()
{
	for (;;)
	{
		printf("win/loss: %" PRIu64 "/%" PRIu64 " (%.3f%%)\n", win, loss, (float)win / loss*100.0f);
		std::this_thread::sleep_for(std::chrono::seconds(1));
	}
}

void thread_race(unsigned* address)
{
	for (;;)
	{
		if (*address != *address)
		{
			win += 1;
		}
		else
		{
			loss += 1;
		}
	}
}

void thread_win(unsigned* address)
{
	for (;;)
	{
		*address ^= 0x1;
	}
}

int main()
{
	unsigned variable = 123;

	std::thread t0(&thread_printer);
	std::thread t1(&thread_race, &variable);
	std::thread t2(&thread_win,  &variable);

	t0.join();
	t1.join();
	t2.join();

	return 0;
}