ReaderWriterLock.IsReaderLockHeld 屬性

定義

命名空間:

System.Threading

組件:

System.Threading.dll

來源:

ReaderWriterLock.cs

取得值，指出目前的執行緒是否掌握讀取器的鎖定。

public:
 property bool IsReaderLockHeld { bool get(); };

public bool IsReaderLockHeld { get; }

member this.IsReaderLockHeld : bool

Public ReadOnly Property IsReaderLockHeld As Boolean

屬性值

Boolean

如果目前的執行緒掌握讀取器的鎖定，則為 true，否則為 false。

範例

下列程式碼範例示範如何使用 IsReaderLockHeld 來避免死結。

using namespace System;
using namespace System::Threading;
int main()
{
   ReaderWriterLock^ rwLock = gcnew ReaderWriterLock;
   rwLock->AcquireWriterLock( Timeout::Infinite );
   rwLock->AcquireReaderLock( Timeout::Infinite );
   if ( rwLock->IsReaderLockHeld )
   {
      Console::WriteLine( "Reader lock held." );
      rwLock->ReleaseReaderLock();
   }
   else
   if ( rwLock->IsWriterLockHeld )
   {
      Console::WriteLine( "Writer lock held." );
      rwLock->ReleaseWriterLock();
   }
   else
   {
      Console::WriteLine( "No locks held." );
   }


   if ( rwLock->IsReaderLockHeld )
   {
      Console::WriteLine( "Reader lock held." );
      rwLock->ReleaseReaderLock();
   }
   else
   if ( rwLock->IsWriterLockHeld )
   {
      Console::WriteLine( "Writer lock held." );
      rwLock->ReleaseWriterLock();
   }
   else
   {
      Console::WriteLine( "No locks held." );
   }
}

using System;
using System.Threading;

class LockHeld
{
    static void Main()
    {
        ReaderWriterLock rwLock = new ReaderWriterLock();

        rwLock.AcquireWriterLock(Timeout.Infinite);
        rwLock.AcquireReaderLock(Timeout.Infinite);

        if(rwLock.IsReaderLockHeld)
        {
            Console.WriteLine("Reader lock held.");
            rwLock.ReleaseReaderLock();
        }
        else if(rwLock.IsWriterLockHeld)
        {
            Console.WriteLine("Writer lock held.");
            rwLock.ReleaseWriterLock();
        }
        else
        {
            Console.WriteLine("No locks held.");
        }

        if(rwLock.IsReaderLockHeld)
        {
            Console.WriteLine("Reader lock held.");
            rwLock.ReleaseReaderLock();
        }
        else if(rwLock.IsWriterLockHeld)
        {
            Console.WriteLine("Writer lock held.");
            rwLock.ReleaseWriterLock();
        }
        else
        {
            Console.WriteLine("No locks held.");
        }
    }
}

Imports System.Threading

Public Class LockHeld

    <MTAThread> _
    Shared Sub Main()
    
        Dim rwLock As New ReaderWriterLock()

        rwLock.AcquireWriterLock(Timeout.Infinite)
        rwLock.AcquireReaderLock(Timeout.Infinite)

        If rwLock.IsReaderLockHeld Then
            Console.WriteLine("Reader lock held.")
            rwLock.ReleaseReaderLock()
        Else If rwLock.IsWriterLockHeld Then
            Console.WriteLine("Writer lock held.")
            rwLock.ReleaseWriterLock()
        Else
            Console.WriteLine("No locks held.")
        End If

        If rwLock.IsReaderLockHeld Then
            Console.WriteLine("Reader lock held.")
            rwLock.ReleaseReaderLock()
        Else If rwLock.IsWriterLockHeld Then
            Console.WriteLine("Writer lock held.")
            rwLock.ReleaseWriterLock()
        Else
            Console.WriteLine("No locks held.")
        End If
    
    End Sub
End Class

另請參閱

• Managed 執行緒處理
• ReaderWriterLock