#include <chrono>
#include <iostream>
#include <mutex>
#include <thread>

using namespace std::chrono_literals;

void task(std::mutex& mutex_A, std::mutex& mutex_B)
{
    mutex_A.lock();

    std::this_thread::sleep_for(10ms);

    mutex_B.lock();

    auto id = std::this_thread::get_id();
    std::cout << id << std::endl;

    mutex_B.unlock();
    mutex_A.unlock();
}

int main()
{
    std::mutex mutex_A { };
    std::mutex mutex_B { };

    std::thread t1 { task, std::ref(mutex_A), std::ref(mutex_B) };
    std::thread t2 { task, std::ref(mutex_B), std::ref(mutex_A) };

    t1.join();
    t2.join();
}