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Timeout Class

Contains constants that specify infinite time-out intervals. This class cannot be inherited.


Namespace:  System.Threading
Assembly:  mscorlib (in mscorlib.dll)

<ComVisibleAttribute(True)> _
Public NotInheritable Class Timeout

The Timeout type exposes the following members.


Public fieldStatic memberSupported by the XNA FrameworkSupported by Portable Class LibraryInfiniteA constant used to specify an infinite waiting period, for threading methods that accept an Int32 parameter.
Public fieldStatic memberInfiniteTimeSpanA constant used to specify an infinite waiting period, for methods that accept a TimeSpan parameter.

The members of this class are used to specify infinite time-out intervals in threading operations. Infinite is used by methods that accept an integer millisecondsTimeout parameter, such as Thread.Sleep(Int32), Thread.Join(Int32), and ReaderWriterLock.AcquireReaderLock(Int32). InfiniteTimeSpan is used by methods that accept a timeout parameter of type TimeSpan, such as Thread.Sleep(TimeSpan), Thread.Join(TimeSpan), and ReaderWriterLock.AcquireReaderLock(TimeSpan).

The following example shows a thread going to sleep for an infinite time and subsequently being woken up.

Option Explicit
Option Strict

Imports System
Imports System.Security.Permissions
Imports System.Threading

Public Class ThreadInterrupt

    <MTAThread> _
    Shared Sub Main()
        Dim stayAwake As New StayAwake()
        Dim newThread As New Thread(AddressOf stayAwake.ThreadMethod)

        ' The following line causes an exception to be thrown  
        ' in ThreadMethod if newThread is currently blocked 
        ' or becomes blocked in the future.
        Console.WriteLine("Main thread calls Interrupt on newThread.")

        ' Tell newThread to go to sleep.
        stayAwake.SleepSwitch = True 

        ' Wait for newThread to end.
    End Sub 

End Class 

Public Class StayAwake

    Dim sleepSwitchValue As Boolean = False 

    WriteOnly Property SleepSwitch As Boolean 
            sleepSwitchValue = Value
        End Set 
    End Property  

    Sub New()
    End Sub 

    Sub ThreadMethod()
        Console.WriteLine("newThread is executing ThreadMethod.")
        While Not sleepSwitchValue

            ' Use SpinWait instead of Sleep to demonstrate the  
            ' effect of calling Interrupt on a running thread.
        End While 
            Console.WriteLine("newThread going to sleep.")

            ' When newThread goes to sleep, it is immediately  
            ' woken up by a ThreadInterruptedException.
        Catch ex As ThreadInterruptedException
            Console.WriteLine("newThread cannot go to " & _
                "sleep - interrupted by main thread.")
        End Try 
    End Sub 

End Class

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0, 1.1

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

XNA Framework

Supported in: 3.0, 2.0, 1.0

Portable Class Library

Supported in: Portable Class Library

Supported in: Windows Phone 8.1

Supported in: Windows Phone Silverlight 8.1

Supported in: Windows Phone Silverlight 8

This type is thread safe.

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