ReaderWriterLock.ReleaseReaderLock Metode

Definisi

Ruang nama:

System.Threading

Rakitan:

netstandard.dll, System.Threading.dll

Sumber:

ReaderWriterLock.cs

Mengurangi jumlah kunci.

public:
 void ReleaseReaderLock();

public void ReleaseReaderLock();

member this.ReleaseReaderLock : unit -> unit

Public Sub ReleaseReaderLock ()

Pengecualian

ApplicationException

Utas tidak memiliki kunci pembaca atau penulis.

Contoh

Contoh kode berikut menunjukkan cara memperoleh dan merilis kunci pembaca, 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 a reader lock, and handle time-outs.
static void ReadFromResource(int timeOut)
{
   try {
      rwl.AcquireReaderLock(timeOut);
      try {
         // It is safe for this thread to read from the shared resource.
         Display("reads resource value " + resource);
         Interlocked.Increment(ref reads);
      }
      finally {
         // Ensure that the lock is released.
         rwl.ReleaseReaderLock();
      }
   }
   catch (ApplicationException) {
      // The reader lock request timed out.
      Interlocked.Increment(ref readerTimeouts);
   }
}

' Request and release a reader lock, and handle time-outs.
Sub ReadFromResource(timeOut As Integer)
   Try
      rwl.AcquireReaderLock(timeOut)
      Try
         ' It's safe for this thread to read from the shared resource.
         Display("reads resource value " & resource)
         Interlocked.Increment(reads)
      Finally
         ' Ensure that the lock is released.
         rwl.ReleaseReaderLock()
      End Try
   Catch ex As ApplicationException
      ' The reader lock request timed out.
      Interlocked.Increment(readerTimeouts)
   End Try
End Sub

}

End Module

Keterangan

ReleaseReaderLock mengurangi jumlah kunci. Ketika jumlah mencapai nol, kunci dilepaskan.

Note

Jika utas memiliki kunci penulis, panggilan ReleaseReaderLock memiliki efek yang sama dengan memanggil ReleaseWriterLock. Jika utas tidak memiliki kunci, panggilan ReleaseReaderLock akan melempar ApplicationException.

Lihat juga

• Managed Threading