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public:
static void Sleep(int millisecondsTimeout);
public static void Sleep (int millisecondsTimeout);
static member Sleep : int -> unit
Public Shared Sub Sleep (millisecondsTimeout As Integer)
Parameters
The number of milliseconds for which the thread is suspended. 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. If there are no other threads of equal priority that are ready to run, execution of the current thread is not suspended.
Examples
The following example uses the
Sleep
method to block the application's main thread.
using namespace System;
using namespace System::Threading;
int main()
for (int i = 0; i < 5; i++)
Console::WriteLine("Sleep for 2 seconds.");
Thread::Sleep(2000);
Console::WriteLine("Main thread exits.");
/* This example produces the following output:
Sleep for 2 seconds.
Sleep for 2 seconds.
Sleep for 2 seconds.
Sleep for 2 seconds.
Sleep for 2 seconds.
Main thread exits.
using System;
using System.Threading;
class Example
static void Main()
for (int i = 0; i < 5; i++)
Console.WriteLine("Sleep for 2 seconds.");
Thread.Sleep(2000);
Console.WriteLine("Main thread exits.");
/* This example produces the following output:
Sleep for 2 seconds.
Sleep for 2 seconds.
Sleep for 2 seconds.
Sleep for 2 seconds.
Sleep for 2 seconds.
Main thread exits.
Imports System.Threading
Class Example
Shared Sub Main()
For i As Integer = 0 To 4
Console.WriteLine("Sleep for 2 seconds.")
Thread.Sleep(2000)
Console.WriteLine("Main thread exits.")
End Sub
End Class
' This example produces the following output:
'Sleep for 2 seconds.
'Sleep for 2 seconds.
'Sleep for 2 seconds.
'Sleep for 2 seconds.
'Sleep for 2 seconds.
'Main thread exits.
Remarks
The thread will not be scheduled for execution by the operating system for the amount of time specified. This method changes the state of the thread to include
WaitSleepJoin
.
You can specify
Timeout.Infinite
for the
millisecondsTimeout
parameter to suspend the thread indefinitely. However, we recommend that you use other
System.Threading
classes such as
Mutex
,
Monitor
,
EventWaitHandle
, or
Semaphore
instead to synchronize threads or manage resources.
The system clock ticks at a specific rate called the clock resolution. The actual timeout might not be exactly the specified timeout, because the specified timeout will be adjusted to coincide with clock ticks. For more information on clock resolution and the waiting time, see the
Sleep function
from the Windows system APIs.
This method does not perform standard COM and SendMessage pumping.
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.
static void Sleep(TimeSpan timeout);
public static void Sleep (TimeSpan timeout);
static member Sleep : TimeSpan -> unit
Public Shared Sub Sleep (timeout As TimeSpan)
Parameters
The amount of time for which the thread is suspended. If the value of the
timeout
argument is
Zero
, the thread relinquishes the remainder of its time slice to any thread of equal priority that is ready to run. If there are no other threads of equal priority that are ready to run, execution of the current thread is not suspended.
Examples
The following example uses the
Sleep(TimeSpan)
method overload to block the application's main thread five times, for two seconds each time.
using namespace System;
using namespace System::Threading;
int main()
TimeSpan interval = TimeSpan(0, 0, 2);
for (int i = 0; i < 5; i++)
Console::WriteLine("Sleep for 2 seconds.");
Thread::Sleep(interval);
Console::WriteLine("Main thread exits.");
/* This example produces the following output:
Sleep for 2 seconds.
Sleep for 2 seconds.
Sleep for 2 seconds.
Sleep for 2 seconds.
Sleep for 2 seconds.
Main thread exits.
using System;
using System.Threading;
class Example
static void Main()
TimeSpan interval = new TimeSpan(0, 0, 2);
for (int i = 0; i < 5; i++)
Console.WriteLine("Sleep for 2 seconds.");
Thread.Sleep(interval);
Console.WriteLine("Main thread exits.");
/* This example produces the following output:
Sleep for 2 seconds.
Sleep for 2 seconds.
Sleep for 2 seconds.
Sleep for 2 seconds.
Sleep for 2 seconds.
Main thread exits.
Imports System.Threading
Class Example
Shared Sub Main()
Dim interval As New TimeSpan(0, 0, 2)
For i As Integer = 0 To 4
Console.WriteLine("Sleep for 2 seconds.")
Thread.Sleep(interval)
Console.WriteLine("Main thread exits.")
End Sub
End Class
' This example produces the following output:
'Sleep for 2 seconds.
'Sleep for 2 seconds.
'Sleep for 2 seconds.
'Sleep for 2 seconds.
'Sleep for 2 seconds.
'Main thread exits.
Remarks
The thread will not be scheduled for execution by the operating system for the amount of time specified. This method changes the state of the thread to include
WaitSleepJoin
.
You can specify
Timeout.InfiniteTimeSpan
for the
timeout
parameter to suspend the thread indefinitely. However, we recommend that you use other
System.Threading
classes such as
Mutex
,
Monitor
,
EventWaitHandle
, or
Semaphore
instead to synchronize threads or manage resources.
This overload of
Sleep
uses the total number of whole milliseconds in
timeout
. Fractional milliseconds are discarded.
This method does not perform standard COM and SendMessage pumping.
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.
