main.cpp

#include <thread>
#include <chrono>
#include <atomic>

int message = 1;
std::atomic<int> sync_dummy{0};

void Write() {
    message = 0;
    sync_dummy.fetch_add(0, std::memory_order_relaxed);
}

int Read() {
    sync_dummy.fetch_add(0, std::memory_order_relaxed);
    return message;
}


int main() {
    std::thread t{Write};
    std::this_thread::sleep_for(std::chrono::seconds(1));
    int result = Read();
    t.join();
    return result;
}