wait_for（）超时之后，是继续阻塞；还是执行后续语句 ？

Question

std::unique_lock<std::mutex>my_lc(my_mutex);
my_cond.wait_for(my_lc, std::chrono::milliseconds(10000));

Answer 1

根据c++源码看，超时后会退出阻塞，继续执行后续代码template <class Rep, class Period>cv_status wait_for (unique_lock<mutex>& lck,const chrono::duration<Rep,Period>& rel_time);return wait_until (lck,chrono::steady_clock::now() + rel_time, std::move(pred));带谓词template <class Rep, class Period, class Predicate>bool wait_for (unique_lock<mutex>& lck,const chrono::duration<Rep,Period>& rel_time, Predicate pred);while (!pred())if (wait_until(lck,abs_time) == cv_status::timeout)&nbsp;return pred();//超时后调用谓词并返回结果，true or falsereturn true;&nbsp;

Answer 2

如果没有获取到，仍然处于阻塞状态