Is there a better way to engineer a `sleep` in JavaScript than the following `pausecomp` function ([taken from here][1])?

    function pausecomp(millis)
    {
        var date = new Date();
        var curDate = null;
        do { curDate = new Date(); }
        while(curDate-date &lt; millis);
    }


This is not a duplicate of https://stackoverflow.com/questions/758688/sleep-in-javascript-delay-between-actions; I want a *real sleep* in the middle of a function, and not a delay before a piece of code executes.


  [1]: http://www.sean.co.uk/a/webdesign/javascriptdelay.shtm

What is the JavaScript version of sleep()?

I would like to know how to put a time delay in a Python script.

How can I make a time delay?

What is the difference between a `wait()` and `sleep()` in Threads?

Is my understanding that a `wait()`-ing Thread is still in running mode and uses CPU cycles but a `sleep()`-ing does not consume any CPU cycles correct?

Why do we have *both* `wait()` and `sleep()`: how does their implementation vary at a lower level?

Difference between wait() and sleep()

I know the POSIX `sleep(x)` function makes the program sleep for x seconds. Is there a function to make the program sleep for x *milliseconds* in C++?


Sleep for milliseconds

How do I get my Python program to sleep for 50 milliseconds?


How do I get my program to sleep for 50 milliseconds?

I am trying to do something in Java and I need something to wait / delay for an amount of seconds in a while loop.

    while (true) {
        if (i == 3) {
            i = 0;
        }

        ceva[i].setSelected(true);

        // I need to wait here

        ceva[i].setSelected(false);

        // I need to wait here

        i++;
    }

I want to build a step sequencer and I&#39;m new to Java. Any suggestions?



How do I make a delay in Java?

How do you tell a Ruby program to wait an arbitrary amount of time before moving on to the next line of code?

Tell Ruby Program to Wait some amount of time

I would like to add a delay/sleep inside a `while` loop:

I tried it like this:

    alert(&#39;hi&#39;);
    
    for(var start = 1; start &lt; 10; start++) {
      setTimeout(function () {
        alert(&#39;hello&#39;);
      }, 3000);
    }

Only the first scenario is true: after showing `alert(&#39;hi&#39;)`, it will be waiting for 3 seconds then `alert(&#39;hello&#39;)` will be displayed but then `alert(&#39;hello&#39;)` will be repeatedly constantly. 

What I would like is that after `alert(&#39;hello&#39;)` is shown 3 seconds after `alert(&#39;hi&#39;)` then it needs to wait for 3 seconds for the second time `alert(&#39;hello&#39;)` and so on.


How do I add a delay in a JavaScript loop?

In Python for *nix, does `time.sleep()` block the thread or the process?

time.sleep -- sleeps thread or process?

Is there to way write a T-SQL command to just make it sleep for a period of time?  I am writing a web service asynchronously and I want to be able to run some tests to see if the asynchronous pattern is really going to make it more scalable.  In order to &quot;mock&quot; an external service that is slow, I want to be able to call a SQL server with a script that runs slowly, but isn&#39;t actually processing a ton of stuff.

Sleep Command in T-SQL?

I have a JavaScript code that I need to add a sleep/wait function to. The code I am running is already in a function, eg:

    function myFunction(time)
    {
        alert(&#39;time starts now&#39;);
        //code to make the program wait before continuing
        alert(&#39;time is up&#39;)
    }

I have heard that a possible solution might include

    setTimeout
but I am not sure how to use it in this case.

I can&#39;t use PHP, as my server does not support it, although using jQuery would be fine.

JavaScript sleep/wait before continuing

What is difference between `wait` and `sleep`?


Difference between wait and sleep

I have tried to delay - or put to sleep - my Java program, but an error occurs.

I&#39;m unable to use `Thread.sleep(x)` or `wait()`. The same error message appears: 

&gt;unreported exception java.lang.InterruptedException; must be caught or declared to be thrown.

Is there any step required before using the `Thread.sleep()` or `wait()` methods?

I get exception when using Thread.sleep(x) or wait()

I&#39;m developing a website in Angular 2 using TypeScript and I was wondering if there was a way to implement `thread.sleep(ms)` functionality.

My use case is to redirect the users after submitting a form after a few seconds which is very easy in JavaScript but I&#39;m not sure how to do it in TypeScript.

How to implement sleep function in TypeScript?

I&#39;ve been using the `input` function as a way to pause my scripts:

    print(&quot;something&quot;)
    wait = input(&quot;Press Enter to continue.&quot;)
    print(&quot;something&quot;)

Is there a formal way to do this?


Correct way to pause a Python program

Is there a JavaScript function that simulates the operation of the `sleep` function in PHP — a function that pauses code execution for x milliseconds, and then resumes where it left off?

I found some things here on Stack Overflow, but nothing useful.

Is there a Sleep/Pause/Wait function in JavaScript?

I use `startx` to start X which will evaluate my `.xinitrc`. In my `.xinitrc` I start my window manager using `/usr/bin/mywm`. Now, if I kill my WM (in order to f.e. test some other WM), X will terminate too because the `.xinitrc` script reached EOF.
So I added this at the end of my `.xinitrc`:

    while true; do sleep 10000; done

This way X won&#39;t terminate if I kill my WM. Now my question: how can I do an **infinite sleep** instead of looping sleep? Is there a command which will kinda like freeze the script?

Bash: infinite sleep (infinite blocking)

I have some source code that was compiled on Windows. I am converting it to run on Red Hat Linux. 

The source code has included the `&lt;windows.h&gt;` header file and the programmer has used the `Sleep()` function to wait for a period of milliseconds. This won&#39;t work on the Linux.

However, I can use the `sleep(seconds)` function, but that uses integer in seconds. I don&#39;t want to convert milliseconds to seconds. Is there a alternative sleep function that I can use with gcc compiling on Linux?


Is there an alternative sleep function in C to milliseconds?

Is there a way I can do a sleep in JavaScript before it carries out another action?

Example:
```javascript
var a = 1 + 3;
// Sleep 3 seconds before the next action here.
var b = a + 4;
```

Sleep in JavaScript - delay between actions

I often see it mentioned that `Thread.Sleep();` should not be used, but I can&#39;t understand why this is so. If `Thread.Sleep();` can cause trouble, are there any alternative solutions with the same result that would be safe?

eg.

    while(true)
    {
        doSomework();
        i++;
        Thread.Sleep(5000);
    }

another one is:

    while (true)
    {
        string[] images = Directory.GetFiles(@&quot;C:\Dir&quot;, &quot;*.png&quot;);
    
        foreach (string image in images)
        {
            this.Invoke(() =&gt; this.Enabled = true);
            pictureBox1.Image = new Bitmap(image);
            Thread.Sleep(1000);
        }
    }

Why is Thread.Sleep so harmful

I am using the Big Nerd Ranch book Objective-C Programming, and it starts out by having us write in C in the first few chapters. In one of my programs it has me create, I use the sleep function. In the book it told me to put `#include &lt;stdlib.h&gt;` under the `#include &lt;stdio.h&gt;` part. This is supposed to get rid of the warning that says &quot;Implicit declaration of function &#39;sleep&#39; is invalid in C99&quot;. But for some reason after I put `#include &lt;stdlib.h&gt;`, the warning does not go away.. This problem does not stop the program from running fine, but I was just curious on which `#include` I needed to use!

What is the proper #include for the function &#39;sleep()&#39;?

Consider a Console application that starts up some services in a separate thread.  All it needs to do is wait for the user to press Ctrl+C to shut it down.  

Which of the following is the better way to do this?

    static ManualResetEvent _quitEvent = new ManualResetEvent(false);
    
    static void Main() {
        Console.CancelKeyPress += (sender, eArgs) =&gt; {
            _quitEvent.Set();
            eArgs.Cancel = true;
        };
    
        // kick off asynchronous stuff 
    
        _quitEvent.WaitOne();
    
        // cleanup/shutdown and quit
    }

Or this, using Thread.Sleep(1):

    static bool _quitFlag = false;
    
    static void Main() {
        Console.CancelKeyPress += delegate {
            _quitFlag = true;
        };
    
        // kick off asynchronous stuff 
    
        while (!_quitFlag) {
            Thread.Sleep(1);
        }
    
        // cleanup/shutdown and quit
    }

How to keep a .NET console app running?

When does Java&#39;s Thread.sleep throw InterruptedException?  Is it safe to ignore it?  I am not doing any multithreading.  I just want to wait for a few seconds before retrying some operation.

When does Java&#39;s Thread.sleep throw InterruptedException?

In Java you can suspend the current thread&#39;s execution for an amount of time using `Thread.sleep()`.  Is there something like this in Objective-C?


What&#39;s the equivalent of Java&#39;s Thread.sleep() in Objective-C/Cocoa?

I want my bash script to sleep until a specific time. So, I want a command like &quot;sleep&quot; which takes no interval but an end time and sleeps until then.

The &quot;at&quot;-daemon is not a solution, as I need to block a running script until a certain date/time.

Is there such a command?

Sleep until a specific time/date

If I&#39;m going to have a call to have a Java Thread go to sleep, is there a reason to prefer one of these forms over the other?

    Thread.sleep(x)

or

    TimeUnit.SECONDS.sleep(y)



Thread.sleep vs. TimeUnit.SECONDS.sleep

I found similar questions asked here but there weren&#39;t answers to my satisfaction. So rephrasing the question again-

I have a task that needs to be done on a periodic basis (say 1 minute intervals). What is advantage of using Timertask &amp; Timer to do this as opposed to creating a new thread that has a infinite loop with sleep?

Code snippet using timertask-

    TimerTask uploadCheckerTimerTask = new TimerTask(){
    
     public void run() {
      NewUploadServer.getInstance().checkAndUploadFiles();
     }
    };
    
    Timer uploadCheckerTimer = new Timer(true);
    uploadCheckerTimer.scheduleAtFixedRate(uploadCheckerTimerTask, 0, 60 * 1000);

Code snippet using Thread and sleep-

    Thread t = new Thread(){
     public void run() {
      while(true) {
       NewUploadServer.getInstance().checkAndUploadFiles();
       Thread.sleep(60 * 1000);
      }
     }
    };
    t.start();

I really don&#39;t have to worry if I miss certain cycles if the execution of the logic takes more than the interval time.

Please comment on this..

Update:  
Recently I found another difference between using Timer versus Thread.sleep(). Suppose the current system time is 11:00AM. If we rollback the system time to 10:00AM for some reason, The Timer will STOP executing the task until it has reached 11:00AM, whereas Thread.sleep() method would continue executing the task without hindrance. This can be a major decision maker in deciding what to use between these two.

Timer &amp; TimerTask versus Thread + sleep in Java

I can give it floating point numbers, such as

    time.sleep(0.5)

but how accurate is it? If i give it

    time.sleep(0.05)

will it really sleep about 50 ms?

How accurate is python&#39;s time.sleep()?

In relation to [my other question][1] today I am wondering how to use [MySQL&#39;s `SLEEP(duration)`](http://dev.mysql.com/doc/refman/5.6/en/miscellaneous-functions.html#function_sleep) correctly.

From what I gathered reading MySQL Dev forums and very vague description in MySQL Docs I can&#39;t use it this way:

    SELECT ...
    SLEEP(1); /* wait for a second before another SELECT */
    SELECT ...

So what is it good for then?


  [1]: https://stackoverflow.com/questions/4284162/calling-stored-procedure-sequentially-from-sql-file-and-php-fails-differently

How and when to use SLEEP() correctly in MySQL?

I have this in my code

    Thread.currentThread().sleep(x);

Eclipse tells me to use the static

    Thread.sleep(x); 

instead, why? What&#39;s the difference, is there some difference in functionality at all between these 2 methods?

Java: Thread.currentThread().sleep(x) vs. Thread.sleep(x)

I want to perform an action at a regular interval in my multi-threaded Python application. I have seen two different ways of doing it

    exit = False
    def thread_func(): 
        while not exit:
           action()
           time.sleep(DELAY)

or 

    exit_flag = threading.Event()
    def thread_func(): 
        while not exit_flag.wait(timeout=DELAY):
           action()

Is there an advantage to one way over the other?  Does one use less resources, or play nicer with other threads and the GIL?  Which one makes the remaining threads in my app more responsive?

(Assume some external event sets `exit` or `exit_flag`, and I am willing to wait the full delay while shutting down)



Python time.sleep() vs event.wait()

I&#39;m playing around with [Qt][1], and I want to create a simple pause between two commands. However it won&#39;t seem to let me use `Sleep(int mili);`, and I can&#39;t find any obvious wait functions.

I am basically just making a console application to test some class code which will later be included in a proper Qt GUI, so for now I&#39;m not bothered about breaking the whole event-driven model.

  [1]: https://en.wikipedia.org/wiki/Qt_%28software%29


How do I create a pause/wait function using Qt?

I&#39;ve seen a few solutions, including watch and simply running a looping (and sleeping) script in the background, but nothing has been ideal.

I have a script that needs to run every 15 seconds, and since cron won&#39;t support seconds, I&#39;m left to figuring out something else.

What&#39;s the most robust and efficient way to run a script every 15 seconds on unix? The script needs to also run after a reboot.

How to get a unix script to run every 15 seconds?

How do I sleep for shorter than a second in Perl?

How do I sleep for a millisecond in Perl?

What is the use of `tim.tv_sec` and `tim.tv_nsec` in the following?

How can I sleep execution for `500000` microseconds?

    #include &lt;stdio.h&gt;
    #include &lt;time.h&gt;
 
    int main()
    {
       struct timespec tim, tim2;
       tim.tv_sec = 1;
       tim.tv_nsec = 500;
 
       if(nanosleep(&amp;tim , &amp;tim2) &lt; 0 )   
       {
          printf(&quot;Nano sleep system call failed \n&quot;);
          return -1;
       }
 
       printf(&quot;Nano sleep successfull \n&quot;);
 
       return 0;
    }

How to use nanosleep() in C? What are `tim.tv_sec` and `tim.tv_nsec`?

please anyone tell me how to use sleep() for few milliseconds in swift 2.2?

    while (true){
        print(&quot;sleep for 0.002 seconds.&quot;)
        sleep(0.002) // not working
    }
but

    while (true){
        print(&quot;sleep for 2 seconds.&quot;)
        sleep(2) // working
    }
it is working.

How to sleep for few milliseconds in swift 2.2?

How can I put  a sleep function between the `TextUI.text = ....`, to wait 3 seconds between each phrase?

    public Text GuessUI;
	public Text TextUI;

    [...truncated...]

    TextUI.text = &quot;Welcome to Number Wizard!&quot;;
    TextUI.text = (&quot;The highest number you can pick is &quot; + max);
	TextUI.text = (&quot;The lowest number you can pick is &quot; + min);

I already tried various things but none have worked, such as this:

    TextUI.text = &quot;Welcome to Number Wizard!&quot;;
    yield WaitForSeconds (3);
    TextUI.text = (&quot;The highest number you can pick is &quot; + max);
    yield WaitForSeconds (3);
	TextUI.text = (&quot;The lowest number you can pick is &quot; + min);


In bash, it would be:

    echo &quot;Welcome to Number Wizard!&quot;
    sleep 3
    echo &quot;The highest number you can pick is 1000&quot;
    sleep 3
    .....

but I can&#39;t figure out how to do this in Unity with C#

How to make the script wait/sleep in a simple way in unity

What&#39;s the best way to sleep a certain amount of time, but be able to be interrupted by a `IsCancellationRequested` from a `CancellationToken`?

I&#39;m looking for a solution which works in .NET 4.0.

I&#39;d like to write


    void MyFunc (CancellationToken ct)
    {
       //... 
       // simulate some long lasting operation that should be cancelable 
       Thread.Sleep(TimeSpan.FromMilliseconds(10000), ct); 
    }
    

How to &quot;sleep&quot; until timeout or cancellation is requested in .NET 4.0

I&#39;m currently trying to learn nodejs and a small project I&#39;m working is writing an API to control some networked LED lights.

The microprocessor controlling the LEDs has a processing delay, and I need to space commands sent to the micro at least 100ms apart. In C# I&#39;m used to just calling Thread.Sleep(time), but I have not found a similar feature in node.

I have found several solutions using the setTimeout(...) function in node, however, this is asynchronous and does not block the thread ( which is what I need in this scenario).

Is anyone aware of a blocking sleep or delay function? Preferably something that does not just spin the CPU, and has an accuracy of +-10 ms?

How to create a sleep/delay in nodejs that is Blocking?

It would be nice if the computer&#39;s &#39;wake up&#39; event was propagated to the browser and available in the JavaScript API. Does anyone know if anything like this is implemented?

Can any desktop browsers detect when the computer resumes from sleep?

On Windows I have a problem I never encountered on Unix. That is how to get a thread to sleep for less than one millisecond. On Unix you typically have a number of choices (sleep, usleep and nanosleep) to fit your needs. On Windows, however, there is only *Sleep* with millisecond granularity. 

On Unix, I can use the use the `select` system call to create a microsecond sleep which is pretty straightforward:

    int usleep(long usec)
    {
        struct timeval tv;
        tv.tv_sec = usec/1000000L;
        tv.tv_usec = usec%1000000L;
        return select(0, 0, 0, 0, &amp;tv);
    }

How can I achieve the same on Windows?


How to make thread sleep less than a millisecond on Windows

I have a method which should be delayed running for a specified amount of time.

Should I use

    Thread thread = new Thread(() =&gt; {
        Thread.Sleep(millisecond);
        action();
    });
    thread.IsBackground = true;
    thread.Start();

Or

    Timer timer = new Timer(o =&gt; action(), null, millisecond, -1);

I had read some [articles][1] about using `Thread.Sleep` is bad design. But I don&#39;t really understand why.

But for using Timer, Timer has dispose method. Since the execution is delayed, I don&#39;t know how to dispose Timer. Do you have any suggestions?

Or if you have alternative codes for delayed execution are also appreciate.

  [1]: http://msmvps.com/blogs/peterritchie/archive/2007/04/26/thread-sleep-is-a-sign-of-a-poorly-designed-program.aspx

Compare using Thread.Sleep and Timer for delayed execution

I have two questions concerning the `sleep()` function in PHP:

1. Does the sleep time affect the maximum execution time limit of my PHP scripts? Sometimes, PHP shows the message &quot;maximum execution time of 30 seconds exceeded&quot;. Will this message appear if I use `sleep(31)`?

2. Are there any risks when using the `sleep() `function? Does it cost a lot of CPU performance?





Does sleep time count for execution time limit?

So I a label here (&quot;&quot;). When the button (button1) is clicked, the label text turns into &quot;Test&quot;. After 2 seconds, the text is set back into &quot;&quot;. I made this work with a timer (which has an interval of 2000):

    private void button1_Click(object sender, EventArgs e)
    {
        label1.Text = &quot;Test&quot;;
        timer.Enabled = true;
    }
    
    private void timer_Tick(object sender, EventArgs e)
    {
        label1.Text = &quot;&quot;;
    }

This works; however though, I am curious about making it work in an async method.

My code looks like this currently:

    private void button1_Click(object sender, EventArgs e)
    {
        label1.Text = &quot;Test&quot;;
        MyAsyncMethod();
    }
    
    public async Task MyAsyncMethod()
    {
        await Task.Delay(2000);
        label1.Text = &quot;&quot;;
    }

This doesn&#39;t work though.

Using async to sleep in a thread without freezing

I used `Sleep(500)` in my code and I used `getTickCount()` to test the timing. I found that it has a cost of about 515ms, more than 500. Does somebody know why that is?


Why does Sleep(500) cost more than 500ms?

I have two statements like this:

    val a = 1
    val b = 2


In between the 2 statements, I want to pause for N seconds like I can in `bash` with `sleep` command. 
 

How to wait for N seconds between statements in Scala?

I used to see `Sleep(0)` in some part of my code where some infinite/long `while` loops are available. I was informed that it would make the time-slice available for other waiting processes. Is this true? Is there any significance for `Sleep(0)`?

Significance of Sleep(0)

I just had a look at the docs on [`sleep()`](http://php.net/manual/en/function.sleep.php).

Where would you use this function?

Is it there to give the CPU a break in an expensive function?

Any common pitfalls?



All Sleep Solutions on Gang of Coders

Total of 48 Sleep Solutions