ReaderWriterLock.ReleaseWriterLock Metode

Definisi

Ruang nama:

System.Threading

Rakitan:

netstandard.dll, System.Threading.dll

Sumber:

ReaderWriterLock.cs

Mengurangi jumlah kunci pada kunci penulis.

public:
 void ReleaseWriterLock();

public void ReleaseWriterLock();

member this.ReleaseWriterLock : unit -> unit

Public Sub ReleaseWriterLock ()

Pengecualian

ApplicationException

Utas tidak memiliki kunci penulis.

Contoh

Contoh kode berikut menunjukkan cara memperoleh dan melepaskan kunci penulis, dan cara menangani pengecualian yang dilemparkan saat permintaan habis.

Kode ini adalah bagian dari contoh yang lebih besar yang disediakan untuk ReaderWriterLock kelas .

// 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

// 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

Keterangan

ReleaseWriterLock mengurangi jumlah kunci penulis. Ketika jumlah mencapai nol, kunci penulis dilepaskan.

Note

Jika utas memiliki kunci pembaca, atau tanpa kunci, panggilan ReleaseWriterLock akan melempar ApplicationException.

Lihat juga

• Managed Threading