Timeout/とは? わかりやすく解説

Timeout クラス

無期限時間指定するために使用される定数含みます。このクラス継承できません。

名前空間: System.Threading
アセンブリ: mscorlib (mscorlib.dll 内)
構文構文

<ComVisibleAttribute(True)> _
Public NotInheritable Class
 Timeout
[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
解説解説

このクラス唯一のメンバである Infinite は、Thread.Sleep(Int32)、Thread.Join(Int32)、および ReaderWriterLock.AcquireReaderLock(Int32) などの整数timeout パラメータ受け入れメソッドによって使用される定数です。

使用例使用例

無制限時間アイドル状態入りその後呼び出されるスレッドの例を次に示します

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
継承階層継承階層
System.Object
  System.Threading.Timeout
スレッド セーフスレッド セーフ

この型は、マルチスレッド操作に対して安全です。

プラットフォームプラットフォーム
バージョン情報バージョン情報
参照参照

Timeout フィールド


Timeout メソッド


Timeout メンバ



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