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RegisteredWaitHandle.Unregister(WaitHandle) Yöntem

Tanım

yöntemi tarafından RegisterWaitForSingleObject(WaitHandle, WaitOrTimerCallback, Object, UInt32, Boolean) verilen kayıtlı bekleme işlemini iptal eder.

public:
 bool Unregister(System::Threading::WaitHandle ^ waitObject);
public bool Unregister (System.Threading.WaitHandle? waitObject);
public bool Unregister (System.Threading.WaitHandle waitObject);
[System.Runtime.InteropServices.ComVisible(true)]
public bool Unregister (System.Threading.WaitHandle waitObject);
member this.Unregister : System.Threading.WaitHandle -> bool
[<System.Runtime.InteropServices.ComVisible(true)>]
member this.Unregister : System.Threading.WaitHandle -> bool
Public Function Unregister (waitObject As WaitHandle) As Boolean

Parametreler

waitObject
WaitHandle

Sinyal WaitHandle alınacak.

Döndürülenler

Boolean

true işlevi başarılı olursa; aksi takdirde , false.

Öznitelikler

Örnekler

Aşağıdaki örnekte, bekleme tutamacını işaretlediğinden Unregister geri çağırma gerçekleştiğinde görevin kaydını kaldırmak için yönteminin nasıl kullanılacağı gösterilmektedir.

Örnekte ayrıca, belirtilen bir bekleme tutamacı sinyalli olduğunda belirtilen geri çağırma yöntemini yürütmek için yönteminin nasıl kullanılacağı RegisterWaitForSingleObject da gösterilir. Bu örnekte geri çağırma yöntemi şeklindedir WaitProcve bekleme tutamacı ise bir AutoResetEventşeklindedir.

Örnek, yürütürken geri çağırmaya geçirilen bilgileri tutacak bir TaskInfo sınıf tanımlar. Örnek bir TaskInfo nesne oluşturur ve nesneye bazı dize verileri atar. RegisteredWaitHandle yöntemi tarafından RegisterWaitForSingleObject döndürülen, geri çağırma yönteminin öğesine erişebilmesi TaskInfo için Handle RegisteredWaitHandlenesnesinin alanına atanır.

Yöntemine yapılan çağrıRegisterWaitForSingleObject, geri çağırma yöntemine geçirilecek nesne olarak belirtmeye TaskInfo ek olarak görevin bekleyeceğini, geri çağırma yöntemini temsil eden WaitProc bir WaitOrTimerCallback temsilciyi, bir saniyelik zaman aşımı aralığını ve birden çok geri çağırmayı belirtirAutoResetEvent.

Ana iş parçacığı yöntemini çağırarak öğesine AutoResetEvent sinyal verdiği Set zaman WaitOrTimerCallback , temsilci çağrılır. WaitProc yöntemi, zaman aşımının oluşup oluşmadığını belirlemek için sınarRegisteredWaitHandle. Bekleme tutamacı sinyalli olduğu için geri çağırma çağrıldıysa yöntemi, WaitProc ek geri çağırmaları RegisteredWaitHandledurdurarak kaydını iptal eder. Zaman aşımı durumunda görev beklemeye devam eder. yöntemi, WaitProc konsola bir ileti yazdırarak sona erer.

using namespace System;
using namespace System::Threading;

// TaskInfo contains data that will be passed to the callback
// method.
public ref class TaskInfo
{
public:
   TaskInfo()
   {
      Handle = nullptr;
      OtherInfo = "default";
   }

   RegisteredWaitHandle^ Handle;
   String^ OtherInfo;
};

ref class Example
{
public:

   // The callback method executes when the registered wait times out,
   // or when the WaitHandle (in this case AutoResetEvent) is signaled.
   // WaitProc unregisters the WaitHandle the first time the event is 
   // signaled.
   static void WaitProc( Object^ state, bool timedOut )
   {
      
      // The state Object must be cast to the correct type, because the
      // signature of the WaitOrTimerCallback delegate specifies type
      // Object.
      TaskInfo^ ti = static_cast<TaskInfo^>(state);
      String^ cause = "TIMED OUT";
      if (  !timedOut )
      {
         cause = "SIGNALED";
         
         // If the callback method executes because the WaitHandle is
         // signaled, stop future execution of the callback method
         // by unregistering the WaitHandle.
         if ( ti->Handle != nullptr )
                  ti->Handle->Unregister( nullptr );
      }

      Console::WriteLine( "WaitProc( {0}) executes on thread {1}; cause = {2}.", ti->OtherInfo, Thread::CurrentThread->GetHashCode(), cause );
   }

};

int main()
{
   
   // The main thread uses AutoResetEvent to signal the
   // registered wait handle, which executes the callback
   // method.
   AutoResetEvent^ ev = gcnew AutoResetEvent( false );
   TaskInfo^ ti = gcnew TaskInfo;
   ti->OtherInfo = "First task";
   
   // The TaskInfo for the task includes the registered wait
   // handle returned by RegisterWaitForSingleObject.  This
   // allows the wait to be terminated when the object has
   // been signaled once (see WaitProc).
   ti->Handle = ThreadPool::RegisterWaitForSingleObject( ev, gcnew WaitOrTimerCallback( Example::WaitProc ), ti, 1000, false );
   
   // The main thread waits three seconds, to demonstrate the
   // time-outs on the queued thread, and then signals.
   Thread::Sleep( 3100 );
   Console::WriteLine( "Main thread signals." );
   ev->Set();
   
   // The main thread sleeps, which should give the callback
   // method time to execute.  If you comment out this line, the
   // program usually ends before the ThreadPool thread can execute.
   Thread::Sleep( 1000 );
   
   // If you start a thread yourself, you can wait for it to end
   // by calling Thread::Join.  This option is not available with 
   // thread pool threads.
   return 0;
}
using System;
using System.Threading;

// TaskInfo contains data that will be passed to the callback
// method.
public class TaskInfo {
    public RegisteredWaitHandle Handle = null;
    public string OtherInfo = "default";
}

public class Example {
    public static void Main(string[] args) {
        // The main thread uses AutoResetEvent to signal the
        // registered wait handle, which executes the callback
        // method.
        AutoResetEvent ev = new AutoResetEvent(false);

        TaskInfo ti = new TaskInfo();
        ti.OtherInfo = "First task";
        // The TaskInfo for the task includes the registered wait
        // handle returned by RegisterWaitForSingleObject.  This
        // allows the wait to be terminated when the object has
        // been signaled once (see WaitProc).
        ti.Handle = ThreadPool.RegisterWaitForSingleObject(
            ev,
            new WaitOrTimerCallback(WaitProc),
            ti,
            1000,
            false
        );

        // The main thread waits three seconds, to demonstrate the
        // time-outs on the queued thread, and then signals.
        Thread.Sleep(3100);
        Console.WriteLine("Main thread signals.");
        ev.Set();

        // The main thread sleeps, which should give the callback
        // method time to execute.  If you comment out this line, the
        // program usually ends before the ThreadPool thread can execute.
        Thread.Sleep(1000);
        // If you start a thread yourself, you can wait for it to end
        // by calling Thread.Join.  This option is not available with 
        // thread pool threads.
    }
   
    // The callback method executes when the registered wait times out,
    // or when the WaitHandle (in this case AutoResetEvent) is signaled.
    // WaitProc unregisters the WaitHandle the first time the event is 
    // signaled.
    public static void WaitProc(object state, bool timedOut) {
        // The state object must be cast to the correct type, because the
        // signature of the WaitOrTimerCallback delegate specifies type
        // Object.
        TaskInfo ti = (TaskInfo) state;

        string cause = "TIMED OUT";
        if (!timedOut) {
            cause = "SIGNALED";
            // If the callback method executes because the WaitHandle is
            // signaled, stop future execution of the callback method
            // by unregistering the WaitHandle.
            if (ti.Handle != null)
                ti.Handle.Unregister(null);
        } 

        Console.WriteLine("WaitProc( {0} ) executes on thread {1}; cause = {2}.",
            ti.OtherInfo, 
            Thread.CurrentThread.GetHashCode().ToString(), 
            cause
        );
    }
}
Imports System.Threading

' TaskInfo contains data that will be passed to the callback
' method.
Public Class TaskInfo
    public Handle As RegisteredWaitHandle = Nothing
    public OtherInfo As String = "default"
End Class

Public Class Example

    <MTAThread> _
    Public Shared Sub Main()
        ' The main thread uses AutoResetEvent to signal the
        ' registered wait handle, which executes the callback
        ' method.
        Dim ev As New AutoResetEvent(false)

        Dim ti As New TaskInfo()
        ti.OtherInfo = "First task"
        ' The TaskInfo for the task includes the registered wait
        ' handle returned by RegisterWaitForSingleObject.  This
        ' allows the wait to be terminated when the object has
        ' been signaled once (see WaitProc).
        ti.Handle = ThreadPool.RegisterWaitForSingleObject( _
            ev, _
            New WaitOrTimerCallback(AddressOf WaitProc), _
            ti, _
            1000, _
            false _
        )

        ' The main thread waits about three seconds, to demonstrate 
        ' the time-outs on the queued task, and then signals.
        Thread.Sleep(3100)
        Console.WriteLine("Main thread signals.")
        ev.Set()

        ' The main thread sleeps, which should give the callback
        ' method time to execute.  If you comment out this line, the
        ' program usually ends before the ThreadPool thread can execute.
        Thread.Sleep(1000)
        ' If you start a thread yourself, you can wait for it to end
        ' by calling Thread.Join.  This option is not available with 
        ' thread pool threads.
    End Sub
   
    ' The callback method executes when the registered wait times out,
    ' or when the WaitHandle (in this case AutoResetEvent) is signaled.
    ' WaitProc unregisters the WaitHandle the first time the event is 
    ' signaled.
    Public Shared Sub WaitProc(state As Object, timedOut As Boolean)
        ' The state object must be cast to the correct type, because the
        ' signature of the WaitOrTimerCallback delegate specifies type
        ' Object.
        Dim ti As TaskInfo = CType(state, TaskInfo)

        Dim cause As String = "TIMED OUT"
        If Not timedOut Then
            cause = "SIGNALED"
            ' If the callback method executes because the WaitHandle is
            ' signaled, stop future execution of the callback method
            ' by unregistering the WaitHandle.
            If Not ti.Handle Is Nothing Then
                ti.Handle.Unregister(Nothing)
            End If
        End If 

        Console.WriteLine("WaitProc( {0} ) executes on thread {1}; cause = {2}.", _
            ti.OtherInfo, _
            Thread.CurrentThread.GetHashCode().ToString(), _
            cause _
        )
    End Sub
End Class

Açıklamalar

belirtilirse waitObject , yalnızca kaydı başarıyla silindiyse RegisteredWaitHandle sinyal görüntülenir. Yürütülürken bir geri çağırma yöntemi devam ederse Unregister , waitObject geri çağırma yöntemi tamamlanana kadar sinyal gösterilmez. Özellikle, bir geri çağırma yöntemi yürütürseUnregisterwaitObject, geri çağırma yöntemi tamamlanana kadar sinyal gösterilmez.

Şunlara uygulanır

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