void func(string &name){    for(auto i=0;i<0xFFFFFFFF;i++)    {        //cout << name << this_thread::get_id() << "running \n";    }}int main(){    string thread_01_name("AThread");    string thread_02_name("BThread");    string thread_03_name("CThread");    string thread_04_name("DThread");    string thread_05_name("EThread");    string thread_06_name("FThread");    string thread_07_name("HThread");    thread thread_01(func,ref(thread_01_name));    thread thread_02(func,ref(thread_02_name));    thread thread_03(func,ref(thread_03_name));    thread thread_04(func,ref(thread_04_name));    thread thread_05(func,ref(thread_05_name));    thread thread_06(func,ref(thread_06_name));    thread thread_07(func,ref(thread_07_name));    thread_01.join();    thread_02.join();    thread_03.join();    thread_04.join();    thread_05.join();    thread_06.join();    thread_07.join();}

static int globNum = 0;mutex g_lock;void func(){    g_lock.lock();    std::cout << " going to in thread ID " << std::this_thread::get_id() << std::endl;    std::this_thread::sleep_for((std::chrono::seconds(1)));    std::cout << " leaving thread ID  " << std::this_thread::get_id() << std::endl;    globNum += 1;    g_lock.unlock();}int main(){    std::thread t1(func);    std::thread t2(func);    std::thread t3(func);    t1.join();    t2.join();    t3.join();    cout << globNum << endl;    return 0;}