Monitor.Exit-Methode

Artikel
08/20/2007

Hebt eine exklusive Sperre für das angegebene Objekt auf.

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

Syntax

'Declaration
Public Shared Sub Exit ( _
    obj As Object _
)
'Usage
Dim obj As Object

Monitor.Exit(obj)

public static void Exit (
    Object obj
)

public:
static void Exit (
    Object^ obj
)

public static void Exit (
    Object obj
)

public static function Exit (
    obj : Object
)

Parameter

obj
Das Objekt, dessen Sperre aufgehoben werden soll.

Ausnahmen

Ausnahmetyp	Bedingung
ArgumentNullException	Der obj-Parameter ist NULL (Nothing in Visual Basic).
SynchronizationLockException	Der aktuelle Thread besitzt die Sperre für das angegebene Objekt nicht.

Hinweise

Der aufrufende Thread muss die Sperre für den obj-Parameter besitzen. Wenn der aufrufende Thread die Sperre für das angegebene Objekt besitzt und Exit genau so oft wie Enter für das Objekt aufgerufen hat, wird die Sperre aufgehoben. Wenn der aufrufende Thread Exit nicht genau so oft wie Enter aufgerufen hat, wird die Sperre nicht aufgehoben.

Wenn die Sperre aufgehoben ist und für das Objekt andere Threads in der Warteschlange der abgearbeiteten Threads vorhanden sind, erhält einer der Threads die Sperre. Wenn andere Threads in der Warteschlange für abzuarbeitende Threads auf die Sperre warten, werden sie bei einem Aufruf von Exit durch den Besitzer der Sperre nicht automatisch in die Warteschlange für abgearbeitete Threads verschoben. Rufen Sie vor dem Aufruf von Exit Pulse oder PulseAll auf, um einen oder mehrere wartende Threads in die Warteschlange für abgearbeitete Threads zu verschieben.

Beispiel

Das folgende Beispiel veranschaulicht die Verwendung der Exit-Methode.

Imports System
Imports System.Threading
Imports System.Collections


Class MonitorSample
    'Define the queue to safe thread access.
    Private m_inputQueue As Queue

    Public Sub New()
        m_inputQueue = New Queue()
    End Sub

    'Add an element to the queue and obtain the monitor lock for the queue object.
    Public Sub AddElement(ByVal qValue As Object)
        'Lock the queue.
        Monitor.Enter(m_inputQueue)
        'Add an element.
        m_inputQueue.Enqueue(qValue)
        'Unlock the queue.
        Monitor.Exit(m_inputQueue)
    End Sub

    'Try to add an element to the queue.
    'Add the element to the queue only if the queue object is unlocked.
    Public Function AddElementWithoutWait(ByVal qValue As Object) As Boolean
        'Determine whether the queue is locked.
        If Not Monitor.TryEnter(m_inputQueue) Then
            Return False
        Else
            m_inputQueue.Enqueue(qValue)
            Monitor.Exit(m_inputQueue)
            Return True
        End If
    End Function

    'Try to add an element to the queue. 
    'Add the element to the queue only if during the specified time the queue object will be unlocked.
    Public Function WaitToAddElement(ByVal qValue As Object, ByVal waitTime As Integer) As Boolean
        'Wait while the queue is locked.
        If Not Monitor.TryEnter(m_inputQueue, waitTime) Then
            Return False
        Else
            m_inputQueue.Enqueue(qValue)
            Monitor.Exit(m_inputQueue)
            Return True
        End If
    End Function

    'Delete all elements that equal the given object and obtain the monitor lock for the queue object.
    Public Sub DeleteElement(ByVal qValue As Object)
        'Lock the queue.
        Monitor.Enter(m_inputQueue)
        Dim counter As Integer = m_inputQueue.Count
        While (counter > 0)  
            'Check each element.
            Dim elm As Object = m_inputQueue.Dequeue()
            If Not elm.Equals(qValue) Then
                m_inputQueue.Enqueue(elm)
            End If
            counter = counter - 1
        End While
        'Unlock the queue.
        Monitor.Exit(m_inputQueue)
    End Sub

    'Print all queue elements.
    Public Sub PrintAllElements()
        'Lock the queue.
        Monitor.Enter(m_inputQueue)
        Dim elmEnum As IEnumerator = m_inputQueue.GetEnumerator()
        While elmEnum.MoveNext()
            'Print the next element.
            Console.WriteLine(elmEnum.Current.ToString())
        End While
        'Unlock the queue.
        Monitor.Exit(m_inputQueue)
    End Sub

    Public Shared Sub Main()
        Dim sample As MonitorSample = New MonitorSample()
        Dim i As Integer

        For i = 0 To 29
            sample.AddElement(i)
        Next i
        sample.PrintAllElements()
        sample.DeleteElement(0)
        sample.DeleteElement(10)
        sample.DeleteElement(20)
        sample.PrintAllElements()
    End Sub

End Class

using System;
using System.Collections;
using System.Threading;

namespace MonitorCS2
{
    /// <summary>
    /// Summary description for Class1.
    /// </summary>
    class MonitorSample
    {
        //Define the queue to safe thread access.
        private Queue m_inputQueue;

        public MonitorSample()
        {
            m_inputQueue = new Queue(); 
        }

        //Add an element to the queue and obtain the monitor lock for the queue object.
        public void AddElement(object qValue)
        {
            //Lock the queue.
            Monitor.Enter(m_inputQueue);
            //Add element
            m_inputQueue.Enqueue(qValue);
            //Unlock the queue.
            Monitor.Exit(m_inputQueue);
        }

        //Try to add an element to the queue.
        //Add the element to the queue only if the queue object is unlocked.
        public bool AddElementWithoutWait(object qValue)
        {
            //Determine whether the queue is locked 
            if(!Monitor.TryEnter(m_inputQueue))
                return false;
            m_inputQueue.Enqueue(qValue);

            Monitor.Exit(m_inputQueue);
            return true;
        }

        //Try to add an element to the queue. 
        //Add the element to the queue only if during the specified time the queue object will be unlocked.
        public bool WaitToAddElement(object qValue, int waitTime)
        {
            //Wait while the queue is locked.
            if(!Monitor.TryEnter(m_inputQueue,waitTime))
                return false;
            m_inputQueue.Enqueue(qValue);
            Monitor.Exit(m_inputQueue);

            return true;
        }
        
        //Delete all elements that equal the given object and obtain the monitor lock for the queue object.
        public void DeleteElement(object qValue)
        {
            //Lock the queue.
            Monitor.Enter(m_inputQueue);
            int counter = m_inputQueue.Count;
            while(counter > 0)
            {   
                //Check each element.
                object elm = m_inputQueue.Dequeue();
                if(!elm.Equals(qValue))
                {
                    m_inputQueue.Enqueue(elm);
                }
                --counter;
            }
            //Unlock the queue.
            Monitor.Exit(m_inputQueue);
        }
        
        //Print all queue elements.
        public void PrintAllElements()
        {
            //Lock the queue.
            Monitor.Enter(m_inputQueue);            
            IEnumerator elmEnum = m_inputQueue.GetEnumerator();
            while(elmEnum.MoveNext())
            {
                //Print the next element.
                Console.WriteLine(elmEnum.Current.ToString());
            }
            //Unlock the queue.
            Monitor.Exit(m_inputQueue); 
        }

        static void Main(string[] args)
        {
            MonitorSample sample = new MonitorSample();
            
            for(int i = 0; i < 30; i++)
                sample.AddElement(i);
            sample.PrintAllElements();
            sample.DeleteElement(0);
            sample.DeleteElement(10);
            sample.DeleteElement(20);
            sample.PrintAllElements();

        }
    }
}

using namespace System;
using namespace System::Collections;
using namespace System::Threading;

// Class definition
public ref class MonitorSample
{
public:
   MonitorSample();
   void AddElement( Object^ qValue );
   bool AddElementWithoutWait( Object^ qValue );
   bool WaitToAddElement( Object^ qValue, int waitTime );
   void DeleteElement( Object^ qValue );
   void PrintAllElements();

private:
   Queue^ m_inputQueue;
};


//Define the queue to safe thread access.
MonitorSample::MonitorSample()
{
   m_inputQueue = gcnew Queue;
}


//Add an element to the queue and obtain the monitor lock for the queue object.
void MonitorSample::AddElement( Object^ qValue )
{
   
   //Lock the queue.
   Monitor::Enter( m_inputQueue );
   
   //Add element
   m_inputQueue->Enqueue( qValue );
   
   //Unlock the queue.
   Monitor::Exit( m_inputQueue );
}


//Try to add an element to the queue.
//Add the element to the queue only if the queue object is unlocked.
bool MonitorSample::AddElementWithoutWait( Object^ qValue )
{
   
   //Determine whether the queue is locked 
   if (  !Monitor::TryEnter( m_inputQueue ) )
      return false;

   m_inputQueue->Enqueue( qValue );
   Monitor::Exit( m_inputQueue );
   return true;
}


//Try to add an element to the queue. 
//Add the element to the queue only if during the specified time the queue object will be unlocked.
bool MonitorSample::WaitToAddElement( Object^ qValue, int waitTime )
{
   
   //Wait while the queue is locked.
   if (  !Monitor::TryEnter( m_inputQueue, waitTime ) )
      return false;

   m_inputQueue->Enqueue( qValue );
   Monitor::Exit( m_inputQueue );
   return true;
}


//Delete all elements that equal the given object and obtain the monitor lock for the queue object.
void MonitorSample::DeleteElement( Object^ qValue )
{
   
   //Lock the queue.
   Monitor::Enter( m_inputQueue );
   int counter = m_inputQueue->Count;
   while ( counter > 0 )
   {
      
      //Check each element.
      Object^ elm = m_inputQueue->Dequeue();
      if (  !elm->Equals( qValue ) )
      {
         m_inputQueue->Enqueue( elm );
      }

      --counter;
   }

   Monitor::Exit( m_inputQueue );
}


//Print all queue elements.
void MonitorSample::PrintAllElements()
{
   
   //Lock the queue.
   Monitor::Enter( m_inputQueue );
   IEnumerator^ elmEnum = m_inputQueue->GetEnumerator();
   while ( elmEnum->MoveNext() )
   {
      
      //Print the next element.
      Console::WriteLine( elmEnum->Current->ToString() );
   }

   Monitor::Exit( m_inputQueue );
}

int main()
{
   MonitorSample^ sample = gcnew MonitorSample;
   for ( int i = 0; i < 30; i++ )
      sample->AddElement( i );
   sample->PrintAllElements();
   sample->DeleteElement( 0 );
   sample->DeleteElement( 10 );
   sample->DeleteElement( 20 );
   sample->PrintAllElements();
}

package MonitorJSL2;

import System.*;
import System.Collections.*;
import System.Threading.*;

/// <summary>
/// Summary description for Class1.
/// </summary>
    
class MonitorSample
{
    //Define the queue to safe thread access.
    private Queue mInputQueue;

    public MonitorSample()
    {
        mInputQueue = new Queue();
    } //MonitorSample

    // Add an element to the queue and obtain the monitor lock for the 
    // queue object.
    public void AddElement(Object qValue)
    {
        //Lock the queue.
        Monitor.Enter(mInputQueue);

        //Add element
        mInputQueue.Enqueue(qValue);

        //Unlock the queue.
        Monitor.Exit(mInputQueue);
    } //AddElement

    //Try to add an element to the queue.
    //Add the element to the queue only if the queue object is unlocked.
    public boolean AddElementWithoutWait(Object qValue)
    {
        //Determine whether the queue is locked 
        if (!(Monitor.TryEnter(mInputQueue))) {
            return false;
        }
        mInputQueue.Enqueue(qValue);
        Monitor.Exit(mInputQueue);
        return true;
    } //AddElementWithoutWait

    //Try to add an element to the queue. 
    //Add the element to the queue only if during the specified time the 
    //queue object will be unlocked.
    public boolean WaitToAddElement(Object qValue, int waitTime)
    {
        //Wait while the queue is locked.
        if (!(Monitor.TryEnter(mInputQueue, waitTime))) {
            return false;
        }
        mInputQueue.Enqueue(qValue);
        Monitor.Exit(mInputQueue);

        return true;
    } //WaitToAddElement

    //Delete all elements that equal the given object and obtain the 
    //monitor lock for the queue object.
    public void DeleteElement(Object qValue)
    {
        //Lock the queue.
        Monitor.Enter(mInputQueue);
        int counter = mInputQueue.get_Count();
        while (counter > 0) {
            //Check each element.
            Object elm = mInputQueue.Dequeue();
            if (!(elm.Equals(qValue))) {
                mInputQueue.Enqueue(elm);
            }
            --counter;
        }

        //Unlock the queue.
        Monitor.Exit(mInputQueue);
    } //DeleteElement

    //Print all queue elements.
    public void PrintAllElements()
    {
        //Lock the queue.
        Monitor.Enter(mInputQueue);
        IEnumerator elmEnum = mInputQueue.GetEnumerator();
        while (elmEnum.MoveNext()) {
            //Print the next element.
            Console.WriteLine(elmEnum.get_Current().ToString());
        }

        //Unlock the queue.
        Monitor.Exit(mInputQueue);
    } //PrintAllElements

    public static void main(String[] args)
    {
        MonitorSample sample = new MonitorSample();

        for (int i = 0; i < 30; i++) {
            sample.AddElement((Int32)i);
        }
        sample.PrintAllElements();
        sample.DeleteElement((Int32)0);
        sample.DeleteElement((Int32)10);
        sample.DeleteElement((Int32)20);
        sample.PrintAllElements();
    } //main 
} //MonitorSample

Plattformen

Windows 98, Windows 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile für Pocket PC, Windows Mobile für Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

.NET Framework unterstützt nicht alle Versionen sämtlicher Plattformen. Eine Liste der unterstützten Versionen finden Sie unter Systemanforderungen.

Freigeben über

Monitor.Exit-Methode

Syntax

Parameter

Ausnahmen

Hinweise

Beispiel

Plattformen

Versionsinformationen

.NET Framework

.NET Compact Framework

Siehe auch

Referenz

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