ReaderWriterLock.ReleaseWriterLock 方法

定義

命名空間:

System.Threading

組件:

netstandard.dll, System.Threading.dll

來源:

ReaderWriterLock.cs

減少寫入鎖的鎖數。

public:
 void ReleaseWriterLock();

public void ReleaseWriterLock();

member this.ReleaseWriterLock : unit -> unit

Public Sub ReleaseWriterLock ()

例外狀況

ApplicationException

這個討論串沒有寫者鎖定。

範例

以下程式碼範例展示了如何取得並釋放寫入鎖定，以及如何處理請求逾時拋出的例外。

此程式碼是該類別更大 ReaderWriterLock 範例的一部分。

// 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

備註

ReleaseWriterLock 減少寫入鎖定數量。 當計數歸零時，寫入鎖定會被解除。

備註

如果執行緒有讀取鎖或沒有鎖定，呼叫 ReleaseWriterLock 會拋出一個 ApplicationException。

另請參閱

• 管理的執行緒
• ReaderWriterLock