test

test.cpp

#include <iostream>
#include <thread>
#include <vector>
#include <random>

#define NUM_THREADS 10
#define GOAL 2147000000 // 2147483647 is max

typedef int32_t random_type;

void GenerateInts(uint64_t& iterations, uint64_t seed) {
	std::default_random_engine generator(seed);
	std::uniform_int_distribution<random_type> distribution(
		std::numeric_limits<random_type>::min(),
		std::numeric_limits<random_type>::max()
	);

	random_type num = std::numeric_limits<random_type>::min();
	
	iterations = 0;

	while (num < GOAL) {
		num = distribution(generator);
		++iterations;
	}
}

int main() {
	
	std::vector<std::thread> threads;

	std::vector<uint64_t> results(NUM_THREADS);

	unsigned seed = std::chrono::system_clock::now().time_since_epoch().count();

	for (int i = 0; i < NUM_THREADS; ++i) {
		threads.push_back(std::thread(std::bind(GenerateInts, std::ref(results[i]), seed + i)));
	}

	for (int i = 0; i < NUM_THREADS; ++i) {
		if (threads[i].joinable()) {
			threads[i].join();
		}
	}

	int winner = 0;
	int winnerScore = results[0];

	for (int i = 1; i < NUM_THREADS; ++i) {
		if (results[i] < winnerScore) {
			winner = i;
			winnerScore = results[i];
		}
	}

	std::cout << "thread " << winner << " wins with a score of " << winnerScore << std::endl;
	std::cout << "-------------------" << std::endl;

	for (int i = 0; i < NUM_THREADS; ++i) {
		std::cout << "thread " << i << ": " << results[i] << std::endl;
	}
}