使用mutex保护链表操作

std::list<int> some_list;
std::mutex some_mutex;


void add_2_list(int new_value) {
    std::lock_guard<std::mutex> guard(some_mutex);
    some_list.push_back(new_value);
}

bool list_contains(int value_2_find) {
    std:std::lock_guard<std::mutex> guard(some_mutex);
    return std::find(some_list.begin(), some_list.end(), value_2_find) != some_list.end();
}