What Is sleep() function and How To Use It In C Program?

C programming language provides sleep() function in order to wait for a current thread for a specified time. slepp() function will sleep given thread specified time for the current executable. Of course, the CPU and other processes will run without a problem.

Include unistd.h Library In Linux

sleep() function is provided by unistd.h library which is a short cut of Unix standard library. We can include this library as below.

Include windows.h Library In Windows

If we are writing an application which will run on the windows platform we should include windows.h library like below.

Cross-Platform Library Solution

Actually there is no cross plat format default library. But we can write our application which will use the proper library according to compile architecture. In this case, we will use _WIN32 constant which will put the appropriate library accordingly.

Sleep Example App

In this part, we will use sleep() function in an example. In this example, we want to sleep for 1 second. As we can see the parameter will be 1 which is an integer.

Sleep For 10 Second

We can also sleep for 10 seconds without a problem. We will just provide the 10 to the sleep function like below.

Sleep For 100 millisecond

As stated previously the sleep function will interpret given value as the second. What if we need to sleep in milliseconds which is lower than second. We can use decimal or float values. In this example, we will sleep for 10 millisecond which can be expressed like 0.01 or 0.010

Sleep Microsecond with usleep() Function

We can also use usleep() function which will sleep given value in a microsecond. In this case, we will sleep for 10 microsecond with usleep() function.

Return Value

The sleep() function will return void which means it will not return anything.

Thread. Sleep Метод

Определение

Приостанавливает текущий поток на заданное время. Suspends the current thread for the specified amount of time.

Перегрузки

Приостанавливает текущий поток на заданное количество миллисекунд. Suspends the current thread for the specified number of milliseconds.

Приостанавливает текущий поток на заданное время. Suspends the current thread for the specified amount of time.

Sleep(Int32)

Приостанавливает текущий поток на заданное количество миллисекунд. Suspends the current thread for the specified number of milliseconds.

Параметры

Количество миллисекунд, на которое приостанавливается поток. The number of milliseconds for which the thread is suspended. Если значение аргумента millisecondsTimeout равно нулю, поток освобождает оставшуюся часть своего интервала времени для любого потока с таким же приоритетом, готовым к выполнению. If the value of the millisecondsTimeout argument is zero, the thread relinquishes the remainder of its time slice to any thread of equal priority that is ready to run. Если других готовых к выполнению потоков с таким же приоритетом нет, выполнение текущего потока не приостанавливается. If there are no other threads of equal priority that are ready to run, execution of the current thread is not suspended.

Исключения

Значение времени ожидания является отрицательной величиной и не равно Infinite. The time-out value is negative and is not equal to Infinite.

Примеры

В следующем примере метод используется Sleep для блокировки основного потока приложения. The following example uses the Sleep method to block the application’s main thread.

Комментарии

Выполнение потока не будет запланировано операционной системой на указанный период времени. The thread will not be scheduled for execution by the operating system for the amount of time specified. Этот метод изменяет состояние потока для включения WaitSleepJoin . This method changes the state of the thread to include WaitSleepJoin.

Можно указать Timeout.Infinite для параметра, millisecondsTimeout чтобы приостановить поток в течение неограниченного времени. You can specify Timeout.Infinite for the millisecondsTimeout parameter to suspend the thread indefinitely. Однако System.Threading Mutex Monitor EventWaitHandle Semaphore для синхронизации потоков или управления ресурсами рекомендуется использовать другие классы, такие как,, или. However, we recommend that you use other System.Threading classes such as Mutex, Monitor, EventWaitHandle, or Semaphore instead to synchronize threads or manage resources.

Системные тактовые импульсы с заданной скоростью, называемой разрешением часов. The system clock ticks at a specific rate called the clock resolution. Фактическое время ожидания может быть не равно указанному времени ожидания, так как указанное время ожидания будет изменено в соответствии с тактами времени. The actual timeout might not be exactly the specified timeout, because the specified timeout will be adjusted to coincide with clock ticks. Дополнительные сведения о разрешении часов и времени ожидания см. в разделе Функция Sleep из системных API Windows. For more information on clock resolution and the waiting time, see the Sleep function from the Windows system APIs.

Этот метод не выполняет стандартные конвейеры COM и SendMessage. This method does not perform standard COM and SendMessage pumping.

Если необходимо включить спящий режим в потоке, который имеет STAThreadAttribute , но вы хотите выполнить стандартные выгрузки com и SendMessage, рассмотрите возможность использования одной из перегруженных версий Join метода, указывающих интервал времени ожидания. If you need to sleep on a thread that has STAThreadAttribute, but you want to perform standard COM and SendMessage pumping, consider using one of the overloads of the Join method that specifies a timeout interval.

Sleep function (synchapi.h)

Suspends the execution of the current thread until the time-out interval elapses.

To enter an alertable wait state, use the SleepEx function.

Syntax

Parameters

The time interval for which execution is to be suspended, in milliseconds.

A value of zero causes the thread to relinquish the remainder of its time slice to any other thread that is ready to run. If there are no other threads ready to run, the function returns immediately, and the thread continues execution.WindowsВ XP:В В A value of zero causes the thread to relinquish the remainder of its time slice to any other thread of equal priority that is ready to run. If there are no other threads of equal priority ready to run, the function returns immediately, and the thread continues execution. This behavior changed starting with Windows ServerВ 2003.

A value of INFINITE indicates that the suspension should not time out.

Return value

Remarks

This function causes a thread to relinquish the remainder of its time slice and become unrunnable for an interval based on the value of dwMilliseconds. The system clock «ticks» at a constant rate. If dwMilliseconds is less than the resolution of the system clock, the thread may sleep for less than the specified length of time. If dwMilliseconds is greater than one tick but less than two, the wait can be anywhere between one and two ticks, and so on. To increase the accuracy of the sleep interval, call the timeGetDevCaps function to determine the supported minimum timer resolution and the timeBeginPeriod function to set the timer resolution to its minimum. Use caution when calling timeBeginPeriod, as frequent calls can significantly affect the system clock, system power usage, and the scheduler. If you call timeBeginPeriod, call it one time early in the application and be sure to call the timeEndPeriod function at the very end of the application.

After the sleep interval has passed, the thread is ready to run. If you specify 0 milliseconds, the thread will relinquish the remainder of its time slice but remain ready. Note that a ready thread is not guaranteed to run immediately. Consequently, the thread may not run until some time after the sleep interval elapses. For more information, see Scheduling Priorities.

Be careful when using Sleep in the following scenarios:

• Code that directly or indirectly creates windows (for example, DDE and COM CoInitialize). If a thread creates any windows, it must process messages. Message broadcasts are sent to all windows in the system. If you have a thread that uses Sleep with infinite delay, the system will deadlock.
• Threads that are under concurrency control. For example, an I/O completion port or thread pool limits the number of associated threads that can run. If the maximum number of threads is already running, no additional associated thread can run until a running thread finishes. If a thread uses Sleep with an interval of zero to wait for one of the additional associated threads to accomplish some work, the process might deadlock.

For these scenarios, use MsgWaitForMultipleObjects or MsgWaitForMultipleObjectsEx, rather than Sleep.

Windows Phone 8.1: This function is supported for Windows Phone Store apps on Windows Phone 8.1 and later.

WindowsВ 8.1 and Windows ServerВ 2012В R2: This function is supported for Windows Store apps on WindowsВ 8.1, Windows ServerВ 2012В R2, and later.

sleep в с++

Sleep
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Sleep()
Как сделать штоб после вывода информации консольное окно не исчезло. Я делал через Sleep().

Sleep в C++
Функция Sleep() останавливается при считывания символа с клавиатуры. Мне нужно создать программу.

sleep
Мне нужно сделать программу которая будет отсчитывать время (10 минут ), а затем открывать файл.

(пространство имён System.Threading)

SanekSV, вы в курсе что имена переменных и функций регистрозависимы
«Sleep» и «sleep» — разные функции

Добавлено через 54 секунды
в dos.h с маленькой

вобще не пойму что делать

Добавлено через 1 минуту
iostream стоит, но он вроде для ввода вывода, а на Sleep не влияет

сейчас попробую, отпишусь что получится

Добавлено через 11 минут
все, вроде пошло, именно sleep().Спасибо за помощь). Меня это устраивает, но почему интересно Sleep() не работает(

Добавлено через 40 секунд
все, вроде пошло, именно sleep().Спасибо за помощь). Меня это устраивает, но почему интересно Sleep() не работает(

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Заказываю контрольные, курсовые, дипломные и любые другие студенческие работы здесь или здесь.

sleep
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Sleep
Доброго времени суток всем. Только начал изучать Delphi, вот, возник вопрос : есть код procedure.

Sleep и COM
Раотаю с COM портом Все нормально, посылаю дааные, принимаю. Проблема в том, что пока жду ответа от.

Sleep
Всем привет. Подскажите пожалуйста что то подобное на sleep, только чтобы сайт не сдох. Спасибо.

Sleep function in C++

Is there a function like Sleep(time); that pauses the program for X milliseconds, but in C++?

Which header should I add and what is the function’s signature?

8 Answers 8

There is also the complementary std::this_thread::sleep_until .

Prior to C++11, C++ had no thread concept and no sleep capability, so your solution was necessarily platform dependent. Here’s a snippet that defines a sleep function for Windows or Unix:

But a much simpler pre-C++11 method is to use boost::this_thread::sleep .

You’ll need at least C++11.

On Unix, include #include .

The call you’re interested in is usleep() . Which takes microseconds, so you should multiply your millisecond value by 1000 and pass the result to usleep() .

Firstly include the unistd.h header file, #include , and use this function for pausing your program execution for desired number of seconds:

x can take any value in seconds.

If you want to pause the program for 5 seconds it is like this:

It is correct and I use it frequently.

It is valid for C and C++.

Prior to C++11, there was no portable way to do this.

A portable way is to use Boost or Ace library. There is ACE_OS::sleep(); in ACE.

The simplest way I found for C++ 11 was this:

Your code (this is an example for sleep 1000 millisecond):

The duration could be configured to any of the following:

Recently I was learning about chrono library and thought of implementing a sleep function on my own. Here is the code,

We can use it with any std::chrono::duration type (By default it takes std::chrono::seconds as argument). For example,

For more information, visit https://en.cppreference.com/w/cpp/header/chrono and see this cppcon talk of Howard Hinnant, https://www.youtube.com/watch?v=P32hvk8b13M. He has two more talks on chrono library. And you can always use the library function, std::this_thread::sleep_for

Note: Outputs may not be accurate. So, don’t expect it to give exact timings.

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