如果条件变量在指定的超时时间内变为满足,线程将被唤醒,并且 wait_for() 返回 cv_status::no_timeout。 如果超时时间到期且仍未收到唤醒通知,wait_for() 返回 cv_status::timeout,线程继续执行。 wait_for() 函数同样有一个谓词版本,用法同 wait() 函数。
std::mutex mtx; std::condition_variable cv; bool data_ready = false; void worker_thread() { std::unique_lock<std::mutex> lock(mtx); bool timeout_occurred = cv.wait_for(lock, std::chrono::seconds(5), [&] { return data_ready; }); if (timeout_occurred) { std::cout << "Time...
std::unique_lock<std::mutex> lck(mtx); while (cv.wait_for(lck,std::chrono::seconds(1)) == std::cv_status::timeout) { std::cout << '.'; std::cout.flush(); } std::cout << "You entered: " << value << '\n'; th.join(); return 0; } std::condition_variable::wait_u...
cv_status wait_for(unique_lock<mutex>& _Lck, const chrono::duration<_Rep, _Period>& _Rel_time) { if (_Rel_time <= chrono::duration<_Rep, _Period>::zero()) { return cv_status::timeout; } // The standard says that we should use a steady clock, but unfortunately our ABI // ...
std::unique_lock<std::mutex>lck(mtx);while(cv.wait_for(lck,std::chrono::seconds(1)) ==std::cv_status::timeout) { std::cout<<'.'; std::cout.flush(); } std::cout<<"You entered:"<< value <<'\n'; th.join();return0; ...
template< class Clock, class Duration, class Predicate > bool wait_until( std::unique_lock<std::mutex>& lock, const std::chrono::time_point<Clock, Duration>& timeout_time, Predicate pred ); (2) (since C++11) wait_until导致当前线程阻塞,直到通知条件变量、到达特定时间或发生虚假唤醒为止,还...
while (cv.wait_for(lck,std::chrono::seconds(1)) == std::cv_status::timeout) { std::cout << '.'; std::cout.flush(); } std::cout << "You entered: " << value << '\n'; th.join(); return 0; } 1. 2. 3. 4. ...
blocks the current thread until the condition variable is woken up or after the specified timeout duration The text has been machine-translated viaGoogle Translate. You can help to correct and verify the translation. Clickherefor instructions. ...
2.3 When the condition variable is notified, a timeout expires, or a spurious wakeup occurs, the thread is awakened, and the mutex is atomically reacquired. The thread should then check the condition and resume waiting if the wake up was spurious. ...
std::cv_statuswait_until( std::unique_lock<std::mutex>& lock,conststd::chrono::time_point<Clock, Duration>& timeout_time );template<classClock,classDuration,classPred >template<classClock,classDuration,classPred >boolwait_until( std::unique_lock<std::mutex>& lock,conststd::chrono::time_...