ReaderWriterLock.IsReaderLockHeld プロパティ

定義

名前空間:

System.Threading

アセンブリ:

System.Threading.dll

ソース:

ReaderWriterLock.cs

現在のスレッドがリーダー ロックを保持しているかどうかを示す値を取得します。

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

public bool IsReaderLockHeld { get; }

member this.IsReaderLockHeld : bool

Public ReadOnly Property IsReaderLockHeld As Boolean

プロパティ値

Boolean

現在のスレッドがリーダー ロックを保持している場合は true。それ以外の場合は false。

例

次のコード例では、 を使用 IsReaderLockHeld してデッドロックを回避する方法を示します。

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

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• ReaderWriterLock