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ReaderWriterLock.ReleaseWriterLock Methode

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Definition

Namespace:
System.Threading
Assembly:
System.Threading.dll
Assembly:
mscorlib.dll
Assembly:
netstandard.dll

Verringert die Sperrenanzahl für die Schreibsperre.

public:
 void ReleaseWriterLock();
public void ReleaseWriterLock ();
member this.ReleaseWriterLock : unit -> unit
Public Sub ReleaseWriterLock ()

Ausnahmen

ApplicationException

Der Thread verfügt nicht über die Schreibsperre.

Beispiele

Im folgenden Codebeispiel wird gezeigt, wie Sie eine Writer-Sperre erwerben und freigeben und wie sie die Ausnahme behandeln, die ausgelöst wird, wenn sich eine Anforderung ausdauert.

Dieser Code ist Teil eines größeren Beispiels, das für die ReaderWriterLock Klasse bereitgestellt wird.

// The complete code is located in the ReaderWriterLock
// class topic.
using namespace System;
using namespace System::Threading;
public ref class Test
{
public:

   // Declaring the ReaderWriterLock at the class level
   // makes it visible to all threads.
   static ReaderWriterLock^ rwl = gcnew ReaderWriterLock;

   // For this example, the shared resource protected by the
   // ReaderWriterLock is just an integer.
   static int resource = 0;

// The complete code is located in the ReaderWriterLock class topic.
using System;
using System.Threading;

public class Example
{
   static ReaderWriterLock rwl = new ReaderWriterLock();
   // Define the shared resource protected by the ReaderWriterLock.
   static int resource = 0;

' The complete code is located in the ReaderWriterLock class topic.
Imports System.Threading

Public Module Example
   Private rwl As New ReaderWriterLock()
   ' Define the shared resource protected by the ReaderWriterLock.
   Private resource As Integer = 0

// Shows how to request and release the writer lock, and
// how to handle time-outs.
static void WriteToResource( Random^ rnd, int timeOut )
{
   try
   {
      rwl->AcquireWriterLock( timeOut );
      try
      {

         // It is safe for this thread to read or write
         // from the shared resource.
         resource = rnd->Next( 500 );
         Display( String::Format( "writes resource value {0}", resource ) );
         Interlocked::Increment( writes );
      }
      finally
      {

         // Ensure that the lock is released.
         rwl->ReleaseWriterLock();
      }

   }
   catch ( ApplicationException^ )
   {

      // The writer lock request timed out.
      Interlocked::Increment( writerTimeouts );
   }

}

// Request and release the writer lock, and handle time-outs.
static void WriteToResource(Random rnd, int timeOut)
{
   try {
      rwl.AcquireWriterLock(timeOut);
      try {
         // It's safe for this thread to access from the shared resource.
         resource = rnd.Next(500);
         Display("writes resource value " + resource);
         Interlocked.Increment(ref writes);
      }
      finally {
         // Ensure that the lock is released.
         rwl.ReleaseWriterLock();
      }
   }
   catch (ApplicationException) {
      // The writer lock request timed out.
      Interlocked.Increment(ref writerTimeouts);
   }
}

' Request and release the writer lock, and handle time-outs.
Sub WriteToResource(rnd As Random, timeOut As Integer)
   Try
      rwl.AcquireWriterLock(timeOut)
      Try
         ' It's safe for this thread to read or write from the shared resource.
         resource = rnd.Next(500)
         Display("writes resource value " & resource)
         Interlocked.Increment(writes)
      Finally
         ' Ensure that the lock is released.
         rwl.ReleaseWriterLock()
      End Try
   Catch ex As ApplicationException
      ' The writer lock request timed out.
      Interlocked.Increment(writerTimeouts)
   End Try
End Sub

};

}

End Module

Hinweise

ReleaseWriterLock Erhöht die Anzahl der Sperre des Autors. Wenn die Anzahl null erreicht, wird die Writer-Sperre freigegeben.

Hinweis

Wenn ein Thread über eine Lesesperre oder keine Sperrungen verfügt, löst ein Aufruf ReleaseWriterLock eine ApplicationException.

Gilt für

Siehe auch