CPU notes. No CPU time is used by Sleep. The program simply ceases to operate. For CPU usage, consider SpinWait, which causes a delay by wasting processor cycles.
First example. Here we invoke the Sleep Sub on the Thread type. Please note how the Imports System.Threading line is included at the top of the program.
Info Sleep 0 pauses the program for zero milliseconds. Sleep 5000 pauses for five seconds. Sleep 1000 pauses for one second.
Here We invoke SpinWait(). This subroutine results in a lot of CPU usage based on the large integer passed to it.
Imports System.Threading
Module Module1
Sub Main()
' Create a Stopwatch and sleep for zero milliseconds.
Dim stopwatch As Stopwatch = stopwatch.StartNew
Thread.Sleep(0)
stopwatch.Stop()
' Write the current time.
Console.WriteLine(stopwatch.ElapsedMilliseconds)
Console.WriteLine(DateTime.Now.ToLongTimeString)
' Start a new Stopwatch.
stopwatch = stopwatch.StartNew
Thread.Sleep(5000)
stopwatch.Stop()
Console.WriteLine(stopwatch.ElapsedMilliseconds)
Console.WriteLine(DateTime.Now.ToLongTimeString)
' Start a new Stopwatch.
stopwatch = stopwatch.StartNew
Thread.Sleep(1000)
stopwatch.Stop()
Console.WriteLine(stopwatch.ElapsedMilliseconds)
' Start a new Stopwatch and use SpinWait.
stopwatch = stopwatch.StartNew
Thread.SpinWait(1000000000)
stopwatch.Stop()
Console.WriteLine(stopwatch.ElapsedMilliseconds)
End Sub
End Module0
9:36:02 AM
4999
9:36:07 AM
999
3128
Namespace. To use Thread.Sleep or Thread.SpinWait, import the System.Threading namespace. These methods are part of Threading, as they are more useful when threads are involved.
A summary. The Thread.Sleep method receives an integer indicating the number of milliseconds you want the program execution to pause.
Summary, continued. The Thread.SpinWait method receives an integer indicating the amount of work to do. This results in 100% CPU usage.
Dot Net Perls is a collection of tested code examples. Pages are continually updated to stay current, with code correctness a top priority.
Sam Allen is passionate about computer languages. In the past, his work has been recommended by Apple and Microsoft and he has studied computers at a selective university in the United States.
This page was last updated on Apr 14, 2023 (edit).