在这个例子中,worker 线程会等待 ready 变量变为 true,或者等待 5 秒后超时。set_ready 线程在 10 秒后将 ready 设置为 true 并通知等待的线程。由于 worker 线程的等待时间只有 5 秒,因此它会因为超时而被唤醒,并输出 "Timeout occurred, condition not met."。
在调用 wait_for() 之前,必须获取一个独占锁(std::unique_lock)并将它传递给 wait_for() 函数。 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(...
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::condition_variable条件变量等待延时。 std::unique_lock<std::mutex> lock(m_mtx); if (m_cond.wait_for(lock, std::chrono::milliseconds(10)) == std::cv_status::timeout) { return LT_TIMEOUT; } 1. 2. 3. 4. 5.
if ( wait_until(lck,abs_time) == cv_status::timeout) return pred(); return true; std::condition_variable::notify_one() 介绍 唤醒某个等待(wait)线程。如果当前没有等待线程,则该函数什么也不做,如果同时存在多个等待线程,则唤醒某个线程是不确定的(unspecified)。
wait_for(lck,std::chrono::seconds(1))==std::cv_status::timeout) { std::cout << '.' << std::endl; } std::cout << "You entered: " << value << '\n'; th.join(); return 0; } 输出: Please, enter an integer (I'll be priniting dots): . . 7 You entered: 7 ...
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; ...
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 ...
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...
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. ...