thread affinity

void set_thread_affinity(int core_id) {
    cpu_set_t cpuset;
    CPU_ZERO(&cpuset);
    CPU_SET(core_id, &cpuset);
    pthread_t current_thread = pthread_self();
    int rc = pthread_setaffinity_np(current_thread, sizeof(cpu_set_t), &cpuset);
    if (rc != 0) {
        std::cerr << "Error setting thread affinity: " << rc << std::endl;
    }
}