Timeout 类
包含用于指定无限长的时间的常数。无法继承此类。
**命名空间:**System.Threading
**程序集:**mscorlib(在 mscorlib.dll 中)
语法
声明
<ComVisibleAttribute(True)> _
Public NotInheritable Class Timeout
用法
可对静态类的成员直接进行访问,无需类的实例。
[ComVisibleAttribute(true)]
public static class Timeout
[ComVisibleAttribute(true)]
public ref class Timeout abstract sealed
/** @attribute ComVisibleAttribute(true) */
public final class Timeout
ComVisibleAttribute(true)
public final class Timeout
备注
此类的唯一成员 Infinite 是由接受整型 timeout 参数(如 Thread.Sleep(Int32)、Thread.Join(Int32) 和 ReaderWriterLock.AcquireReaderLock(Int32))的方法使用的一个常数。
示例
下面的代码示例说明线程如何无限期地进入休眠状态,以及后来如何被唤醒。
Option Explicit
Option Strict
Imports System
Imports System.Security.Permissions
Imports System.Threading
<Assembly: SecurityPermissionAttribute(SecurityAction.RequestMinimum, _
ControlThread := True)>
Public Class ThreadInterrupt
<MTAThread> _
Shared Sub Main()
Dim stayAwake As New StayAwake()
Dim newThread As New Thread(AddressOf stayAwake.ThreadMethod)
newThread.Start()
' The following line causes an exception to be thrown
' in ThreadMethod if newThread is currently blocked
' or becomes blocked in the future.
newThread.Interrupt()
Console.WriteLine("Main thread calls Interrupt on newThread.")
' Tell newThread to go to sleep.
stayAwake.SleepSwitch = True
' Wait for newThread to end.
newThread.Join()
End Sub
End Class
Public Class StayAwake
Dim sleepSwitchValue As Boolean = False
WriteOnly Property SleepSwitch As Boolean
Set
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.
Thread.SpinWait(10000000)
End While
Try
Console.WriteLine("newThread going to sleep.")
' When newThread goes to sleep, it is immediately
' woken up by a ThreadInterruptedException.
Thread.Sleep(Timeout.Infinite)
Catch ex As ThreadInterruptedException
Console.WriteLine("newThread cannot go to " & _
"sleep - interrupted by main thread.")
End Try
End Sub
End Class
using System;
using System.Security.Permissions;
using System.Threading;
[assembly: SecurityPermissionAttribute(SecurityAction.RequestMinimum,
ControlThread = true)]
class ThreadInterrupt
{
static void Main()
{
StayAwake stayAwake = new StayAwake();
Thread newThread =
new Thread(new ThreadStart(stayAwake.ThreadMethod));
newThread.Start();
// The following line causes an exception to be thrown
// in ThreadMethod if newThread is currently blocked
// or becomes blocked in the future.
newThread.Interrupt();
Console.WriteLine("Main thread calls Interrupt on newThread.");
// Tell newThread to go to sleep.
stayAwake.SleepSwitch = true;
// Wait for newThread to end.
newThread.Join();
}
}
class StayAwake
{
bool sleepSwitch = false;
public bool SleepSwitch
{
set{ sleepSwitch = value; }
}
public StayAwake(){}
public void ThreadMethod()
{
Console.WriteLine("newThread is executing ThreadMethod.");
while(!sleepSwitch)
{
// Use SpinWait instead of Sleep to demonstrate the
// effect of calling Interrupt on a running thread.
Thread.SpinWait(10000000);
}
try
{
Console.WriteLine("newThread going to sleep.");
// When newThread goes to sleep, it is immediately
// woken up by a ThreadInterruptedException.
Thread.Sleep(Timeout.Infinite);
}
catch(ThreadInterruptedException e)
{
Console.WriteLine("newThread cannot go to sleep - " +
"interrupted by main thread.");
}
}
}
using namespace System;
using namespace System::Security::Permissions;
using namespace System::Threading;
[assembly:SecurityPermissionAttribute(SecurityAction::RequestMinimum,
ControlThread=true)];
ref class StayAwake
{
private:
bool sleepSwitch;
public:
property bool SleepSwitch
{
void set( bool value )
{
sleepSwitch = value;
}
}
StayAwake()
{
sleepSwitch = false;
}
void ThreadMethod()
{
Console::WriteLine( "newThread is executing ThreadMethod." );
while ( !sleepSwitch )
{
// Use SpinWait instead of Sleep to demonstrate the
// effect of calling Interrupt on a running thread.
Thread::SpinWait( 10000000 );
}
try
{
Console::WriteLine( "newThread going to sleep." );
// When newThread goes to sleep, it is immediately
// woken up by a ThreadInterruptedException.
Thread::Sleep( Timeout::Infinite );
}
catch ( ThreadInterruptedException^ /*e*/ )
{
Console::WriteLine( "newThread cannot go to sleep - "
"interrupted by main thread." );
}
}
};
int main()
{
StayAwake^ stayAwake = gcnew StayAwake;
Thread^ newThread = gcnew Thread( gcnew ThreadStart( stayAwake, &StayAwake::ThreadMethod ) );
newThread->Start();
// The following line causes an exception to be thrown
// in ThreadMethod if newThread is currently blocked
// or becomes blocked in the future.
newThread->Interrupt();
Console::WriteLine( "Main thread calls Interrupt on newThread." );
// Then tell newThread to go to sleep.
stayAwake->SleepSwitch = true;
// Wait for newThread to end.
newThread->Join();
}
import System.*;
import System.Security.Permissions.*;
import System.Threading.*;
import System.Threading.Thread;
/** @assembly SecurityPermissionAttribute(SecurityAction.RequestMinimum,
ControlThread = true)
*/
class ThreadInterrupt
{
public static void main(String[] args)
{
StayAwake stayAwake = new StayAwake();
Thread newThread = new Thread(new ThreadStart(stayAwake.ThreadMethod));
newThread.Start();
// The following line causes an exception to be thrown
// in ThreadMethod if newThread is currently blocked
// or becomes blocked in the future.
newThread.Interrupt();
Console.WriteLine("Main thread calls Interrupt on newThread.");
// Tell newThread to go to sleep.
stayAwake.set_SleepSwitch(true);
// Wait for newThread to end.
newThread.Join();
} //main
} //ThredInterrupt
class StayAwake
{
private boolean sleepSwitch = false;
/** @property
*/
public void set_SleepSwitch(boolean value)
{
sleepSwitch = value;
} //set_SleepSwitch
public StayAwake()
{
} //StayAwake
public void ThreadMethod()
{
Console.WriteLine("newThread is executing ThreadMethod.");
while (!(sleepSwitch)) {
// Use SpinWait instead of Sleep to demonstrate the
// effect of calling Interrupt on a running thread.
Thread.SpinWait(10000000);
}
try {
Console.WriteLine("newThread going to sleep.");
// When newThread goes to sleep, it is immediately
// woken up by a ThreadInterruptedException.
Thread.Sleep(Timeout.Infinite);
}
catch (ThreadInterruptedException e) {
Console.WriteLine(("newThread cannot go to sleep - "
+ "nterrupted by main thread."));
}
} //ThreadMethod
} //StayAwake
继承层次结构
System.Object
System.Threading.Timeout
线程安全
该类型对于多线程操作是安全的。
平台
Windows 98、Windows 2000 SP4、Windows CE、Windows Millennium Edition、Windows Mobile for Pocket PC、Windows Mobile for Smartphone、Windows Server 2003、Windows XP Media Center Edition、Windows XP Professional x64 Edition、Windows XP SP2、Windows XP Starter Edition
.NET Framework 并不是对每个平台的所有版本都提供支持。有关受支持版本的列表,请参见系统要求。
版本信息
.NET Framework
受以下版本支持:2.0、1.1、1.0
.NET Compact Framework
受以下版本支持:2.0、1.0
请参见
参考
Timeout 成员
System.Threading 命名空间
Thread 类